JP7064661B2 - Grinding and polishing grindstone with outer diameter increase / decrease control and grinding / polishing / honing processing method with this outer diameter increase / decrease control grinding and polishing grindstone - Google Patents

Description

The present invention relates to a grinding wheel with an outer diameter increase / decrease control that enables grinding, polishing, honing, and polishing of the inner and outer surfaces of the work material, and a grinding, polishing, honing, and polishing processing method using this grindstone. In particular, the present invention relates to a grindstone that performs the characteristics required for a grindstone whose outer diameter is increased or decreased by controlling various waveforms of a coolant supplied to the inside of the grindstone by pressure control.

In recent years, many honing units, honing heads, and honing processing control devices for inner diameter processing that honing and wrap the inner diameter surface of the work material with a honing grindstone that increases or decreases the inner diameter of the work material have been provided. Has been done. On the other hand, in connection with the invention of the applicant of the present application, a new grinding and polishing grindstone "Honing grindstone" named Rickhorn, which controls the increase and decrease of the outer diameter, is provided.

First, there is one that enables radial control of the honing tool and performs high-precision hole drilling without being affected by wear of the honing grindstone.
The configuration is a honing unit control mechanism that gives the honing unit a rotation relative to the spindle by numerical control to the spindle that rotates with the honing unit attached to the tip and the control shaft provided through the spindle. The honing unit engages with the control shaft and rotates together with the control shaft, and moves in the axial direction by the rotation of the connecting shaft that engages with the screw formed at the tip of the connecting shaft. A nut, a radial control shaft that is connected to this nut and moves in the axial direction, and is arranged on the peripheral surface of this radial control shaft, and the honing grindstone moves in the radial direction by the axial movement of the radial control shaft. It is a numerically controlled honing device including a honing tool and capable of controlling the honing tool in the radial direction even while the spindle is rotating (see, for example, Patent Document 1).

Next, there is a honing head for bottomed hole machining, which is suitable for improving the machining accuracy of honing of the inner surface of the bottomed hole cylinder, particularly the accuracy of straightness.
The configuration is such that the honing wheel base 5 supported so as to be movable in the radial direction along the outer circumference of the cylindrical honing head main body 7 is such that the tapered cone 2b housed in the honing head main body 7 is axially independent of the tapered cone 1a. It is a honing head for drilling a bottomed hole configured to forcibly expand the stop side portion of the grindstone base in the radial direction as it moves to the stop side of the machined hole by moving to (see, for example, Patent Document 2). ..

Further, there is a honing processing control device suitable for stabilizing the quality, shortening the processing time, and extending the life of the grindstone mainly by improving the shape accuracy of the honing processing.
The configuration consists of pressure values at points A, B, and C detected by piezoelectric elements mounted on a plurality of honing wheel stands 5 supported by the honing head main body 7, and points A, B, and C measured by the air micro 13. It is a honing machining control device provided with a calculation control unit that inputs an inner diameter value, outputs and controls the amount of movement of the first taper cone 1 and the second taper cone 2 in the axial direction, and corrects the accuracy of the inner surface of the cylinder of the workpiece. (See, for example, Patent Document 3.).

Further, it enhances the truing accuracy of a high hardness honing grindstone made of a diamond grindstone, a CBN grindstone, or the like.
The configuration is such that center holes 15 and 16 are formed on both end faces of an expansion rod 9 that expands and contracts the honing wheel 7 together with the wheel shoe 6. After adjusting the adjusting nut 29 so that it is in a predetermined expanded state, the center holes 15 and 16 are used to support the entire honing head 1 at the centers 32 and 33 of the cylindrical grinding machine by holding both sides and using a trueuing grindstone G. Grind. At the time of honing processing, the adjusting nut 29 is removed and the push rod is connected to the female thread portion 17 (see, for example, Patent Document 4).

Further, there is a honing device that suppresses the wear of the tapered cone and improves the life.
The structure is such that the tapered cone 5 integrally formed with the main shaft 2 has a tapered contact surface 5a with the honing table 6. A honing grindstone 4 is formed on the outer peripheral portion of the honing table 6, and the honing grindstone 4 is in contact with the work material 7. The tapered cone 5 rotates and descends with the rotation of the main shaft 2, and the lowering of the tapered cone 5 pushes the honing table 6 toward the outer peripheral direction through the contact surface 5a. As a result, the honing grindstone 4 provided on the outer peripheral portion of the honing table 6 is pressed against the work material 7, and the work material 7 is ground to be finished to a predetermined size (see, for example, Patent Document 5). .).

Japanese Unexamined Patent Publication No. 8-216015 Japanese Unexamined Patent Publication No. 5-004163 Japanese Unexamined Patent Publication No. 5-277928 Japanese Unexamined Patent Publication No. 2000-6001 Japanese Unexamined Patent Publication No. 2004-268197

As cited in Patent Documents 1 to 5, almost all of the honing grindstones whose diameter increases or decreases with respect to the inner diameter of the conventional work material are cylindrical honing heads as seen in Japanese Patent Application Laid-Open No. 5-004163. The honing wheel base, which is supported so as to be movable in the radial direction along the outer circumference of the main body, moves to the stop side of the machined hole by the tapered cone housed in the honing head main body moving in the axial direction independently of the tapered cone. This is a honing head for drilling bottomed holes that is configured to forcibly expand the stop side of the grindstone stand in the radial direction.

However, the tapered cone housed in the honing head body moves in the axial direction independently of the tapered cone, so that the stop side of the grindstone stand is forcibly expanded in the radial direction as it moves to the stop side of the machined hole. The honing head for bottom hole machining and the like are diameter-increasing honing grindstones for machining that increase or decrease the outer diameter of the honing grindstone by mechanical means. For this reason, there is a mechanical friction part, and the taper cone is mechanically forcibly controlled to move in the axial direction of the main axis of rotation. , The problem of giving mechanical stress to the grindstone is pointed out.

For this reason, it is difficult to obtain the life of the diameter-increasing honing grindstone for honing and wrapping the inner diameter surface of the work material and the accuracy for honing and wrapping the inner diameter surface of the work material. Is pointed out.

Further, as a conventional flex horn grindstone called a simple flex horn, the one shown in FIG. 1 (a) is provided. The configuration is such that a large number of nylon resins 2 having a repulsive force are planted in a columnar shape on the tip end side of the rotating shaft 1, and a polishing ball 3 is attached to the tip end thereof. The polishing action is more accurate because the repulsive force cannot be adjusted when the polishing ball 3 licks the inner diameter surface 4a of the work material 4 with the repulsive force of the nylon resin 2 as the rotating shaft 1 rotates. There is a problem that the face cannot be obtained. Further, the flex horn grindstone D cannot be finished by honing and wrapping only by polishing the outer peripheral surface of the work material 4.

In view of the problems of the flex horn grindstone D in the prior art as described above, the inventor of the present application supplies the inside of the grindstone with characteristic performance for controlling the increase / decrease in diameter, which dramatically improves various problems in the flex horn grindstone. We have researched and developed a honing grindstone "Rick horn shown in FIG. 1 (b) 10" for increasing / decreasing inner diameter and outer surface machining, which is executed by controlling the pressure of the coolant and controlling the waveform of the injection pressure.
That is, the grinding and polishing grindstone named Rick Horn, which controls the increase and decrease of the outer diameter, is also effective for grinding, polishing, honing, and wrapping the inner surface of the work material. The "tongue (flap)" is pressed against the inner surface of the work material by the static pressure or pulsation of the coolant hydraulic pressure, and the pressing force of the tongue is repeatedly acted on. That is, "a grindstone whose diameter has been reduced due to a decrease in the coolant liquid pressure is set on the inner diameter of the work material, and the coolant liquid spreads over the entire circumference until the diameter is increased by pressurization (constant pressure or pulse pressure) to cover the entire surface of the work. It can be cooled and lubricated, and can be processed in a wide range from grinding, polishing, honing, and polishing at the same time over the entire length and circumference of the inner diameter of the work material. "
Furthermore, in order to eliminate the possibility that the processing shape caused by not ensuring the coaxiality between the work material and the grindstone becomes an "oval, drum, drum" shape, the centering mechanism between the grindstone shaft and the inner diameter shaft of the work material makes it high. Enables accurate processing.
Then, with a grinding and polishing grindstone that controls the increase and decrease of the outer diameter, grinding, polishing, and honing are performed on the outer peripheral surface. By processing the grindstone, it is possible to process the surface roughness and shape with high accuracy. "

The grinding wheel for controlling the increase / decrease in outer diameter according to claim 1 for achieving the above object has a small diameter portion in which a small diameter portion and a large diameter portion are alternately connected to the tip of the grindstone mounting spindle having a center through and the tip of the grindstone mounting spindle. A grindstone mounting shaft portion in which a large number of small holes connected to the center through are radially drilled to the outer diameter, and an inner wall surface of a cylindrical body is fitted to the large diameter portion in the grindstone mounting shaft portion, and the cylindrical body is the outer periphery thereof. The hole arrangement derived from the optimum polishing results and the injection holes arranged in the axial direction are connected in a row in the outer diameter radiation direction, which is the rotation direction, in many places on the surface, and each injection hole in each of the above rows. Each flexible grindstone strip is attached so as to close each from the traveling side in the rotation direction of the cylindrical body, and both ends of the cylindrical body are secretly enclosed and surrounded by the grindstone mounting shaft portion. The static pressure or pulsating pressure of the coolant sent into the cylinder toward each flexible grindstone strip fixed to the outer peripheral portion from a large number of small holes in the wheel increases or decreases each flexible grindstone strip by bending in the outer diameter direction. It is characterized in that the diameter is increased and the bending pressing pressure on the inner diameter surface or the flat surface of the work material is controlled by the bending increase / decrease diameter of the flexible grindstone strip to grind and grind.

The grinding wheel for controlling the outer diameter increase / decrease according to claim 2 is the grinding wheel for controlling the outer diameter increase / decrease according to claim 1. In the grinding wheel for controlling the outer diameter increase / decrease, each flexible grindstone strip attached to the outer periphery of the cylindrical body is derived from the optimum polishing result. It is characterized in that the central portion or an arbitrary portion is long and wide and has a tongue-like shape or a deformed shape, and the portion having a large grinding allowance on the grinding surface is formed into a wide shape.

The grinding wheel for controlling the outer diameter increase / decrease according to claim 3 is the grinding wheel for controlling the outer diameter increase / decrease according to claim 1. The flexible grindstone strip attached to the outer periphery of the cylindrical body has abrasive grains on the rope piece. It is characterized in that the shape of the fixed or woven brush is adjusted to the arrangement, density and diameter derived from the optimum polishing result and laid.

The method of grinding, polishing, and honing using a grinding wheel for controlling outer diameter increase / decrease according to claim 4 is the cylindrical body of the grinding wheel for controlling outer diameter increase / decrease in the grinding wheel for controlling outer diameter increase / decrease according to claims 1 to 3. Is inserted into the diameter of the work material, and the static pressure or pulsating pressure coolant is discharged from the coolant supply device to the center through by the NC program from the NC control device. While feeding and increasing the diameter of the flexible grindstone strip of the cylindrical body with the coolant hydraulic pressure, the coolant liquid spreads over the entire circumference of the work material to cool and lubricate the entire grinding surface, and the coolant liquid is used. Each flexible grindstone strip on the circumferential surface of the cylindrical body is controlled in the direction of increasing the diameter, and the flexible grindstone strip is pressed against the inner diameter surface of the work material by the bending force of the whip to polish and polish. It is characterized by polishing the entire length and circumference of the cutting material.

The method of grinding / polishing / honing using a grinding wheel with an outer diameter increase / decrease control according to claim 5 is the grinding / polishing / honing method using a grinding wheel with an outer diameter increase / decrease control according to claim 4. Prior to machining, the grindstone mounting shaft for fitting the cylindrical body and the grindstone mounting spindle with a center through are connected by a universal joint so that they can be centered, and the cylindrical body is press-fitted into the inner diameter of the work material when it is inserted. It is characterized by being automatically centered by the pulsating pressure of the coolant.

The grindstone mounting spindle for controlling the increase / decrease in outer diameter according to claim 6 includes a grindstone mounting spindle having a center through, a grindstone mounting shaft portion having a small hole connected to the center through at the tip of the grindstone mounting spindle, and the grindstone mounting shaft. The inner hole of the large-diameter cylinder fits into the grindstone mounting shaft, and the large-diameter cylinder has small holes lined up in several places on the outer peripheral surface in the axial direction toward the outer diameter radiation direction, which is the rotation direction. A flexible grindstone strip is attached so as to close each small hole row from the traveling side in the rotation direction of the large-diameter cylindrical body, and the outer periphery of each small hole of the large-diameter cylindrical body is attached from the grindstone mounting shaft portion. The diameter of the flexible grindstone strip increases or decreases due to the pulsating pressure of the coolant sent toward the flexible grindstone strip that is fixed to the portion, and the bending and pressing pressure on the inner diameter surface or flat surface of the work material is controlled for grinding. It is characterized by polishing.

The grinding / polishing / honing processing method using the grinding wheel for controlling the outer diameter increase / decrease according to claim 7 is the large-diameter cylindrical body of the grinding wheel for controlling the outer diameter increase / decrease in the grinding wheel for controlling the outer diameter increase / decrease according to claim 6. The coolant from the coolant supply device is a grindstone in which the static pressure or pulsating pressure coolant solution according to the NC program of the NC control device is opened to the center through while the work material is brought close to the outer surface or the inner surface of the large circumference. It is sent from the mounting spindle into the large-diameter cylinder, and the coolant liquid controls each flexible grindstone strip on the circumferential surface of the large-diameter cylinder in the diameter-increasing direction, and the flexible grindstone strip is machined. It is characterized in that it can be polished by pressing it against the outer surface of the material or the inner surface of the circumference with the bending force of a grindstone.

According to the grindstone for controlling the increase / decrease in the outer diameter of claim 1, the flexible grindstone strip "tongue (flap)" is the work material due to the suppression of grinding burn by the internal liquid flow grinding / polishing of the grindstone and the pulsation of the coolant hydraulic pressure. By repeatedly pressing and loosening the grindstone elastically, the reduced diameter grindstone is set to the inner diameter and increased by pressurization (constant static pressure or pulsating pressure), and grinding and polishing to honing at the same time over the entire length and circumference. Processing becomes possible.

In the grinding wheel for controlling the increase / decrease in the outer diameter of claim 2, each flexible grindstone strip attached to the outer periphery of the cylindrical body has a long and wide tongue shape in the central portion or an arbitrary portion derived from the actual optimum polishing result. Alternatively, the shape is made irregular so that the part with a large grinding allowance on the grinding surface has a wide shape or the central part has a long tongue-like shape. The entire surface is strongly pressed to actively grind and polish the part with a large grinding allowance, and during honing, the central part of the flexible grindstone strip is weakly polished and honed with a long tongue-like shape as a low pressure.・ Fine adjustment can be made as the processing progresses to polishing and honing. As a result, the uneven ground surface becomes a uniform finished surface, and a highly accurate flat surface can be finished.

The grinding grindstone for controlling the increase / decrease in the outer diameter of claim 3 has a brush shape in which the flexible grindstone strip attached to the outer periphery of the cylindrical body is formed by fixing or knitting the abrasive grains to the rope piece, so that the pulsation of the coolant liquid is generated. At high pressure, the honing surface of the work material can be strongly pressed and polished at the base of the rope piece, and at low pressure, the ground surface can be finely adjusted with high accuracy by polishing widely and weakly at the tip of the rope piece.

The method of grinding, polishing, and honing using a grinding wheel for controlling outer diameter increase / decrease according to claim 4 is the cylindrical body of the grinding wheel for controlling outer diameter increase / decrease in the grinding wheel for controlling outer diameter increase / decrease according to claims 1 to 3. Is inserted into the diameter of the work material, and the static pressure or pulsating pressure coolant is discharged from the coolant supply device to the center through by the NC program from the NC control device. By feeding in and controlling the flexible grindstone strip of the cylindrical body in the direction of increasing the diameter in response to the coolant liquid, it is possible to grind, polish, and honing the entire length and circumference of the work material within the diameter.

The grinding / polishing / honing method using the grinding wheel for controlling the increase / decrease in the outer diameter according to claim 5 is the grinding / polishing / honing method according to claim 4, wherein the grindstone mounting shaft portion for fitting the cylindrical body and the center through are provided. It is connected to the opened grindstone mounting spindle with a universal joint so that it can be centered, and can be automatically centered by the pulsating pressure of the coolant hydraulic pressure that is press-fitted when the above-mentioned cylindrical body is inserted into the inner diameter of the work material. After this automatic centering, the grinding / polishing / honing processing method using the grinding and polishing grindstone of the outer diameter increase / decrease control according to claim 4 is carried out, and the inner diameter surface of the work material is secured while the coaxiality between the work material and the grindstone is secured. The polishing shape of is not "elliptical, drum, drum", and perfect circle polishing and honing can be performed with high accuracy.

The grinding wheel for controlling the increase / decrease in the outer diameter according to claim 6 can grind, polish, and honing so that the tongue licks while following the shape of the work material in the outer surface processing, in addition to the large inner diameter surface. Therefore, high-precision surface roughness and high-precision shape processing are possible.

The method of grinding / polishing / honing using a grinding wheel with an outer diameter increase / decrease control according to claim 7 is a large-diameter cylindrical body of the grinding wheel with an increase / decrease diameter honing stone for outer surface processing in the grinding polishing wheel with an outer diameter increase / decrease control according to claim 6. In the state of being in contact with the outer surface of the work material, from the coolant supply device, the static pressure or pulsating pressure coolant liquid was released to the center through by the NC program from the NC control device. By feeding in and changing the coolant hydraulic pressure, the flexible grindstone strip of the large-diameter cylindrical body is controlled in the increasing diameter direction, and the wide outer surface of the work material can be ground, polished, and honed with high accuracy.

An embodiment and a conventional example of the present invention are shown, and a partial view and a cross-sectional view of a rex horn and a grinding wheel for controlling an outer diameter increase / decrease of the present invention. An embodiment of the present invention is shown, and is a cross-sectional view of a grinding wheel and an automatic centering mechanism for controlling an increase / decrease in outer diameter. An embodiment of the present invention is shown, and is an operation diagram of a grinding wheel and an automatic centering mechanism for controlling an increase / decrease in outer diameter. An embodiment of the present invention is shown, and is a perspective view and a cross-sectional view of an action of a grinding wheel with an outer diameter increase / decrease control. An embodiment of the present invention is shown, and it is sectional drawing which works of the main part of the grinding grindstone which controls each outer diameter increase / decrease. An embodiment of the present invention is shown, and is a piping diagram to a coolant device and a grinding wheel for controlling each outer diameter increase / decrease. An embodiment of the present invention is shown, and is a perspective view of another grinding wheel for controlling an increase / decrease in outer diameter. An embodiment of the present invention is shown, and it is a plane action diagram of another grinding grinding wheel of outer diameter increase / decrease control. An embodiment of the present invention is shown, and it is a pulse pressure polishing operation diagram by the grinding polishing grindstone of the outer diameter increase / decrease control. An embodiment of the present invention is shown, and is a perspective view of a correction relationship between a distorted inner diameter and a flexible grindstone strip.

Hereinafter, embodiments of the grinding wheel for controlling the increase / decrease in outer diameter of the present invention will be sequentially described with reference to FIGS. 1 to 10.

First, in FIGS. 1 (b) and 1 (C) and FIGS. 4 to 6, the grinding wheel 10 for controlling the outer diameter increase / decrease, which is the first embodiment of the present invention, is the grindstone mounting main shaft 6 having the center through 5. At the tip of the grindstone mounting spindle, a small diameter portion 6a and a large diameter portion 6b are alternately connected to each other, and a large number of small holes 6C connected to the center through are formed in the small diameter portion radially in the outer diameter direction. The inner wall surface 11a of the cylindrical body 11 is fitted to the large diameter portion of the grindstone mounting shaft portion, and the cylindrical body has the hole arrangement and hole diameter of the small holes 11C derived from the optimum polishing results at a large number of places on the outer peripheral surface 11b. The injection holes 11C arranged in the axial center direction O are continuously provided in the outer diameter radiation direction which is the rotation direction Y. Further, in FIGS. 4 to 6, in particular, in FIG. 5, a plurality of flexible grindstone strips 8 are attached so as to close the small hole 11C row of each row from the traveling side of the cylindrical body 11 in the rotation direction Y. The abrasive grains 13 are fixed to the surface. Further, in FIG. 1C, both ends of the cylindrical body 1I are secretly enclosed and surrounded by the grindstone mounting shaft portion 7, and the flexibility is fixed to the outer peripheral portion from a large number of small holes 6C of the grindstone mounting shaft portion 7. The diameter of each flexible grindstone strip 8 can be increased or decreased by bending in the outer diameter direction by the static pressure or pulsating pressure of the coolant liquid (also called coolant hydraulic pressure) CK sent into the cylindrical body toward the grindstone strip piece. The grindstone 10 is configured to control the increase / decrease in the outer diameter of the lick horn, which is grindstoned by controlling the flexure pressing force on the inner diameter surface or the flat surface of the work material by the deflection increase / decrease diameter of the flexible grindstone strip.

Further, the grinding wheel 12 for controlling the outer diameter increase / decrease in the second embodiment is the grinding wheel 10 for controlling the outer diameter increase / decrease, as shown in FIGS. 4 (b) and 6 (b), the outer circumference of the cylindrical body 11. The central portion 9a of the flexible grindstone strip 9 attached to 11b has a long tongue-like shape, and the abrasive grains 13 are fixed to the entire surface thereof. Further, in the grinding wheel 12a shown in FIG. 10, in the diameter-increasing honing wheel 10 for inner diameter processing, the central portion 9a of the flexible grindstone strip 9 attached to the outer circumference 11b of the cylindrical body 11 is recessed, and both the left and right sides 9b are recessed. , 9c is a modified example having a tongue-shaped shape and the abrasive grains 13 are fixed to the entire surface thereof.

According to the grindstone 12 of the outer diameter increase / decrease control of the second embodiment and the grindstone 12a of the modification thereof, the grindstones 12 and 12a of the outer diameter increase / decrease control are attached to the outer periphery of the cylindrical body, respectively. In the flexible grindstone strip 9, when the inner diameter W3 of the work material W has a small diameter at the center thereof, the central portion 9a of the flexible grindstone strip 9 is long and has a tongue-shaped outer diameter increase / decrease control. The grindstone 12 is adopted. When the central portion of the inner diameter W4 of the work material W has a large diameter, the central portion 9a of the flexible grindstone strip 9 is shortened, and the both sides 9b and 9c are lengthened into a tongue-shaped shape to control the increase / decrease in outer diameter. A grinding wheel 12a is used.

As for the tongue-shaped shape, the central part or an arbitrary part derived from the actual optimum polishing result is made long and wide tongue-shaped or irregular shape, and the part having a large grinding allowance on the grinding surface is made into a wide shape, or the central part is made long tongue. Since the shape is shaped, the pressure of the pulsation of the coolant is high, and the entire surface of the work material is strongly pressed at the base of the flexible grindstone strip to actively grind and polish the part with a large grinding allowance during honing. As a low pressure, the central part of the flexible grindstone strip is lengthened and weakly polished and honing, so fine adjustment can be made as the processing progresses to grinding, polishing and honing. As can be seen in FIG. 10, the inner diameters W3 and W4 of the work material W on the uneven ground surface can grind, polish, and honing the inner diameter W0 of the work material W on a uniform finished surface, and are highly accurate. Finished on a flat surface.

Further, the grinding wheel 14 for controlling the increase / decrease in the outer diameter of the third embodiment is the outer peripheral 11b of the cylindrical body 11 as shown in FIGS. 4 (c) and 6 (c) in the diameter-increasing honing grindstone 10 for inner diameter processing. The flexible grindstone strip piece 14 attached to the above was formed into a brush shape in which the abrasive grains 13 were fixed or knitted to the rope piece 15a. The grinding grindstone 14 for controlling the increase / decrease in the outer diameter has a brush shape in which the flexible grindstone strip attached to the outer periphery of the cylindrical body is formed by fixing or knitting the abrasive grains to the rope piece 15a, so that the pulsation of the coolant is high. At the time of pressure, the honing surface of the work material can be strongly pressed and polished at the base of the rope piece, and at low pressure, the ground surface can be finely adjusted with high accuracy by polishing widely and weakly at the tip of the rope piece.

Further, in the fourth embodiment, in the grinding wheel 10, 12, 14 of the outer diameter increase / decrease control, in FIG. 6, the coolant supply device 50 is statically pressured by the NC program control PG created by the NC control device 60. Flexible grindstone strip pieces 8, 9, 15 with the coolant hydraulic pressure CK sent into the cylindrical body 11 from the grindstone mounting spindle 6 where the coolant hydraulic pressure CK of P0 to pulsating pressures P1, P2, P3 is opened in the center through 5. Is controlled to increase or decrease the diameter in four types of patterns.

The grinding wheels 10, 12, and 14 for controlling the increase / decrease in the outer diameter have a static pressure or static pressure from the coolant supply device according to the NC program from the NC control device with the cylindrical body inserted within the diameter of the work material. The pulsating pressure coolant liquid is sent into the inside of the cylinder from the grindstone mounting spindle opened in the center through, and the flexible grindstone strip of the cylinder is controlled in the diameter increase direction corresponding to the coolant liquid, and the diameter of the work material is increased. It is possible to grind, polish, and honing the entire inner length and circumference.

Subsequently, with reference to FIG. 6, the control system of the coolant supply device 50 and the NC control device 60 and the grinding wheels 10, 12, and 14 for controlling the outer diameter increase / decrease will be described. The coolant supply device 50 includes a two-cylinder plunger pump P (single cylinder AC, BC) that supplies the coolant liquid CK in the tank T by the motor MO of the drive source, and a coolant having a pulsating pressure discharged from the plunger pump P. It is equipped with check valves V1 to V5 that switch the liquid CK in various ways. By switching between the check valves V1 to V5 and the switching valves V6 and V7, a route for piping and supplying four types of coolant liquid CK to the grinding and polishing grindstones 10, 12, and 14 for controlling the increase and decrease of each outer diameter is formed. The coolant liquid CK to be discharged is the combined pressure (P1 + P2) P3 of the single cylinder AC, the pressure P2 of the single cylinder BC, and the combined pressure (P1 + P2) P3 according to the NC control program PG from the NC control device 60. P1 + P2) P3 is put into the accumulator AQ and switched to four types with a constant pressure P0.

Then, first, the automatic centering mechanism 70 shown in FIGS. 2 and 3 and its operation are performed. Prior to the honing action, the grinding and polishing grindstones 10, 12, and 14 for controlling the outer diameter increase / decrease have an automatic centering mechanism 70 when the pulsating coolant liquid CK is supplied into the cylinder 11 to increase the pulsating diameter of the cylinder. Works. The details will be described with reference to FIG. First, in FIG. 3 (1), there is a deviation in the axial center between the grindstone 10 and the work material W, and the grindstone 10 is inserted into the work material W as it is as shown in FIG. 3 (2). Subsequently, as shown in FIG. 3 (3), when the pulsating coolant liquid CK is supplied into the cylinder 11 and the diameter of the cylinder increases, the automatic centering mechanism works and the grindstone shaft moves to the axis of the work material W. It moves and is centered and centered. After that, the grinding process is started as shown in FIG. 3 (4), and the cylindrical body 11 is subjected to the pulsating increase / decrease diameter as shown in FIG. 3 (5). Finally, as shown in FIG. 3 (6), the coolant liquid CK is stopped, the grindstone 10 after grinding is removed from the work material W, and the grinding / honing process is completed at the same time as the action of the automatic centering mechanism 70.

As shown in FIGS. 4 to 6, the grinding wheels 10, 12, and 14 for controlling the increase / decrease in the outer diameters operate as follows. The flexible grindstone strips 8, 9, and 15 of the grinding wheel strips 10, 12, and 14 of each outer diameter increase / decrease control are used when the grinding wheel 10, 12, 14 of each outer diameter increase / decrease control is inserted into the work material W. Since the rotation is stopped, the coolant hydraulic pressure CK is stopped and the coolant is turned off. As a result, the flexible grindstone strips 8, 9, and 15 approach the outer peripheral surface 11b of the cylindrical body 11 and are separated from the inner diameter W1 of the work material W. In this state, the grinding wheels 10, 12, and 14 for controlling the outer diameter increase / decrease are inserted into the inner diameter W1, and then the grinding wheels 10, 12, 14 for controlling the outer diameter increase / decrease are rotated, and the pulsating coolant liquid CK is applied to each cylinder. When the diameter of each cylindrical body is increased by supplying it into the body 11, the automatic centering mechanism works and automatic centering is performed. That is, in the diameter-increasing honing and polishing grindstone for inner diameter processing, the grindstone mounting shaft portion for fitting the cylindrical body and the grindstone mounting spindle having a center through are connected by a universal joint so as to be centered, and the cylindrical body is covered. It is automatically centered by the pulsating pressure of the coolant hydraulic pressure that is press-fitted into the inner diameter of the cutting material at the time of insertion.

After the action of the automatic centering mechanism 70, the grinding / honing process starts. The state is that the coolant is ON as shown in FIG. 4, and the discharged coolant liquid CK is the combined pressure of the pressure P1 of the single cylinder AC and the pressure P2 of the single cylinder BC by the NC control program PG from the NC control device 60. (P1 + P2) P3 and the combined pressure (P1 + P2) P3 are put into the accumulator AQ and switched to one of four types of constant pressure P0 by the control system of the NC control device 60. With the coolant liquid, as shown in FIGS. 4 and 5, each flexible grindstone strip piece 8, 9, 15 is cooled from the small hole 11C toward the base of each flexible grindstone strip piece 8, 9, 15. When pressed by the pressing force F of the liquid, it is pressed against the inner diameter W1 of the work material W.

Subsequently, the grinding wheel 10, 12, and 14 for controlling the outer diameter increase / decrease are rotated, and the abrasive grains 13 adhering to the outer periphery of the grinding wheel 10, 12, 14 for controlling the outer diameter increase / decrease are used for honing. As a result, "grinding and polishing in the grindstone" suppresses grinding burns, and "the pulsation of the coolant causes the" tongue (flap) "to press the work material", thereby adding "a reduced diameter grindstone to the inner diameter". The diameter is increased by the pressure (constant pressure or pulse pressure), and a highly accurate ground surface and polished surface can be obtained simultaneously over the entire length and circumference by the flow of the coolant liquid CK.

Subsequently, the configuration and pulse pressure polishing action of the grinding wheel 20 for controlling the increase / decrease in outer diameter shown in FIGS. 7 to 9 will be described below. In this external polishing process, "By polishing the flexible grindstone strip (tongue) 21 so that it licks while following the shape of the work material W2 of the blade, it is possible to polish the surface roughness and shape with high accuracy." I succeeded in doing it.

The configuration thereof is the grindstone mounting main shaft 23 having the center through 22 and the grindstone, similarly to the grindstone 10 for controlling the outer diameter increase / decrease according to the first embodiment in FIGS. 7 (a) and 8. The tip of the mounting spindle 23 has a grindstone mounting shaft portion 24 having a through hole 22a connected to the center through 22, and the tip portion of the grindstone mounting shaft portion has an inner hole portion 25a of a large-diameter cylindrical body 25 serving as a base. It is fitted to the grindstone mounting shaft portion 24. In the large-diameter cylindrical body 25, small holes 27 arranged in several places on the circumference of the ring portion 26 forming the outer peripheral surface 26a are continuously provided in the outer diameter direction which is the rotation direction X, and each small hole row is made large. A flexible grindstone strip 21 was attached so as to close the diameter cylinder 25 from the traveling side in the rotation direction X, and was fixed from the grindstone mounting shaft portion 23 to the outer peripheral portion 26a of each small hole 27 of the large diameter cylinder 25. Increase / decrease diameter honing iron 20 for external machining as a lick horn in which the flexible abrasive band piece swirls in the outer radial direction due to static pressure or pulsation of the coolant liquid CK sent toward the flexible abrasive band piece 21. Is made up of. The tip of the tongue of the flexible grindstone strip 21 is a quadrangle 21a. 7 (b) shows the tip of the tongue of the flexible grindstone strip 21 having a circular shape 21b, and FIG. 7 (c) shows the tip of the tongue of the flexible grindstone strip 21 alternating between a quadrangle 21a and a circular shape 21b. It is installed.

Subsequently, with respect to the grinding wheel 20 for controlling the increase / decrease in the outer diameter, a state in which the flexible grindstone strip (tongue) 21 is licked while following the shape of the work material W2 of the blade to be flat according to FIG. To explain. In the grinding wheel 20 for controlling the increase / decrease in the outer diameter, the flexible grindstone strip 21 laid on the large-diameter cylindrical body 25 of the grinding wheel 25 for controlling the increase / decrease in the outer diameter is brought close to the outer surface of the work material W2. Then, from the coolant supply device 50, the coolant liquid CK of static pressure P0 to pulsating pressures P1, P2, P3 is applied from the grindstone mounting main shaft 23 after opening the center through 22a by the NC program PG from the NC control device 60. It is sent into 25, and the flexible grindstone strip 21 on the outer peripheral portion of the large-diameter cylindrical body is controlled in the diameter-increasing direction with the coolant liquid, and the side surface of the work material W2 is polished and honed. As shown in the pressure diagram (SIN curve) of FIG. 9, this honing action causes the flexible grindstone strip 21 to increase in diameter and polish and honing the side surface of the work material W2 when the coolant liquid is high. When the coolant hydraulic pressure becomes zero pressure, the diameter of the flexible grindstone strip 21 is reduced and separated from the side surface of the work material W2, which acts to weaken grinding, polishing, and honing. The above is the honing method using the grinding wheel 20 for controlling the increase / decrease in outer diameter.

According to the grinding and polishing grindstone with outer diameter increase / decrease control and the grinding / polishing grindstone with outer diameter increase / decrease control and the grinding / polishing / honing processing method according to the present invention.
1. Grinding and polishing grindstone with outer diameter increase / decrease control called lick horn is also effective for honing and wrapping of inner and outer diameters. The "tongue (flap)" is pressed against the work material by pulsation, and by repeating this, "the reduced diameter grindstone is set to the inner diameter and the diameter is increased by pressurization (constant pressure or pulse pressure), and the total length and circumference are increased. The grindstone is pressed against the inner surface of the work material and the bending force of the whip is applied to enable simultaneous grinding and polishing. "
2. It is possible to perform high-precision processing with a low possibility that the polishing shape caused by the lack of coaxiality between the work material and the grindstone will be "ellipse, drum, drum".
3. In the outer peripheral surface processing by the grinding and polishing grindstone 20 with the outer diameter increase / decrease control, "processing so that the tongue licks while following the shape of the work material enables highly accurate surface roughness and shape processing".

The present invention is not limited to the above-mentioned grinding and polishing grindstones 10, 12, 14, and 20 for controlling each outer diameter increase / decrease, and is also applied to a wide range of embodiments such as other grindstones.

5 Center through 6 Grindstone mounting spindle 6a Small diameter 6b Large diameter 6C Small hole 7 Grindstone mounting shaft 8 Flexible grindstone strip pieces 10, 12, 15 Grinding grindstone 11 Cylindrical body 11a Inner wall surface 11b Outer surface 11C Small hole 20 Grinding grindstone with outer diameter increase / decrease control 21 Flexible grindstone band piece (tongue)
22 Center through 22a Through hole 23 Grinding stone mounting spindle 24 Grinding stone mounting shaft 25 Large diameter cylinder 25a Inner hole 27 Small hole 26 Ring part O Axial center direction 50 Coolant supply device 60 NC control device 70 Automatic centering mechanism CK Coolant liquid AC Single cylinder BC Single cylinder P1 Pressure P2 Pressure P0 Constant pressure (P1 + P2) P3 Combined pressure AQ Accumulator W Work material W1, W3, W4 Inner diameter W2 Work material W0 Inner diameter X, Y Rotational direction

Claims (7)

A grindstone mounting spindle with a center through and a grindstone mounting with a large number of small holes radially connected to the center through in the small diameter portion by alternately connecting small diameter portions and large diameter portions at the tip of the grindstone mounting spindle. The inner wall surface of the cylindrical body fits into the large diameter portion of the shaft portion and the grindstone mounting shaft portion, and the cylindrical body is set to the hole arrangement and hole diameter derived from the optimum polishing results in many places on the outer peripheral surface. The injection holes lined up in the axial direction are connected in a row toward the outer diameter radial direction, which is the rotation direction, and each flexible grindstone is closed so that each injection hole in each of the above rows is closed from the traveling side in the rotation direction of the cylindrical body. Each of the strips is attached, and both ends of the cylindrical body are secretly placed and surrounded by the grindstone mounting shaft portion, and the flexible grindstone strips fixed to the outer peripheral portion are directed from a large number of small holes in the grindstone mounting shaft portion. The static pressure or pulsating pressure of the coolant sent into the cylindrical body increases or decreases the diameter of each flexible grindstone strip by bending in the outer diameter direction, and the deflection increasing or decreasing diameter of the flexible grindstone strip increases or decreases the diameter of the work material. A grinding wheel with an outer diameter increase / decrease control, characterized in that the bending pressing force on the inner diameter surface or the flat surface is controlled for grinding and polishing. In the grinding wheel of the outer diameter increase / decrease control of claim 1, in the grinding wheel of the outer diameter increase / decrease control, each flexible grindstone strip attached to the outer periphery of the cylindrical body has a central portion derived from the optimum polishing result. Alternatively, a grinding wheel with an outer diameter increase / decrease control, characterized in that an arbitrary portion is long and wide and has a tongue-like shape or a deformed shape so that a portion having a large grinding allowance on the grinding surface has a wide shape. In the grinding wheel for controlling the increase / decrease in outer diameter according to claim 1, the flexible grindstone strip attached to the outer periphery of the cylindrical body has a brush shape in which abrasive grains are fixed or woven to a rope piece, and the shape of the brush is derived from the optimum polishing result. Grinding and polishing grindstone with outer diameter increase / decrease control, which is characterized by being laid after being adjusted to the arrangement, density, and diameter. In the grinding wheel of the outer diameter increase / decrease control of claims 1 to 3, NC control is performed from the coolant supply device in a state where the cylindrical body of the grinding wheel of the outer diameter increase / decrease control is inserted into the diameter of the work material. The static pressure or pulsating pressure coolant liquid is sent into the inside of the cylinder from the grindstone mounting spindle opened in the center through by the NC program from the device, and the coolant is added while the diameter of the flexible grindstone strip of the cylinder is increased by the coolant liquid. The liquid spreads over the entire circumference of the work material to cool and lubricate the entire surface of the grindstone, and the coolant liquid controls each flexible grindstone strip on the circumferential surface of the cylindrical body in the direction of increasing diameter. The flexible grindstone strip is pressed against the inner diameter surface of the work material by the bending force of a whip to polish it, and the entire inner diameter and the entire circumference of the work material are polished. Grinding / polishing / honing method using a grindstone. In the grinding / polishing / honing process method using a grinding wheel with an outer diameter increase / decrease control according to claim 4, prior to the grinding / polishing / honing process, the grindstone mounting shaft portion for fitting the cylindrical body and the grindstone with a center through are opened. The outer diameter increase / decrease control is characterized by being connected to the mounting spindle by a universal joint so that it can be centered, and automatically centered by the pulsating pressure of the coolant liquid that is press-fitted when the above-mentioned cylindrical body is inserted into the inner diameter of the work material. Grinding / polishing / honing method using a grindstone. A grindstone mounting spindle with a center through, a grindstone mounting shaft with a small hole connected to the center through at the tip of the grindstone mounting spindle, and an inner hole of a large-diameter cylindrical body mounted on the grindstone mounting shaft. The large-diameter cylindrical body is fitted to the shaft portion, and small holes arranged in the axial center direction are continuously provided in several places on the outer peripheral surface in the outer diameter radial direction as the rotation direction, and each small hole row is formed into a large-diameter cylindrical body. A flexible grindstone strip is attached so as to close from the traveling side in the rotation direction of the wheel, and is fed from the grindstone mounting shaft portion toward the flexible grindstone strip piece fixed to the outer peripheral portion of each small hole of the large-diameter cylindrical body. The diameter of the flexible grindstone strip increases or decreases due to the pulsating pressure of the coolant liquid, and the grinding and polishing is performed by controlling the bending pressing pressure on the inner diameter surface or the flat surface of the work material. Whetstone. In the grindstone for controlling the increase / decrease in the outer diameter according to claim 6, the coolant is supplied in a state where the large-diameter cylindrical body of the grindstone for controlling the increase / decrease in the outer diameter is brought close to the outer surface of the work material or the inner surface of the large circumference. The coolant liquid from the device is sent into the large-diameter cylindrical body from the grindstone mounting spindle where the static pressure or pulsating pressure coolant liquid according to the NC program of the NC control device is opened in the center through, and the coolant liquid is used to rotate the circumference of the large-diameter cylindrical body. Each flexible grindstone strip on the surface is controlled in the increasing diameter direction, and the flexible grindstone strip is pressed against the outer surface of the work material or the inner surface of the circumference by the bending force of the whip to enable polishing. A grinding / polishing / honing method using a grinding wheel with an outer diameter increase / decrease control.

Images