JPH0866869A - Segment grinding wheel unit - Google Patents

Abstract

PURPOSE: To provide a segment grinding wheel which can quickly align the lower surfaces of the grinding wheel chips of a plurality of grinding wheel segments by providing a segment grinding wheel unit with a position adjustment mechanism. CONSTITUTION: In this segment grinding wheel unit having a plurality of grinding wheel segments 3 freely removably mounted, for the purpose of grinding the plane parts of workpieces, on the outer peripheral surface of a rotating support 1 rotating about a wheel spindle, each of the grinding wheel segments 3 is columnar and metallic and has a super-hard-abrasive-grain-containing grinding wheel piece secured to its longitudinal end, and the rotating support 1 is provided with fixing mechanisms by which the respective grinding wheel segments 3 are removably fixed. Also, the fixing mechanism of each grinding wheel segment 3 is provided with a screw feed mechanism which can move back and forth in the direction parallel to the direction of movement of each grinding wheel segment 3 in order to equalize the heights by which the grinding wheel segments 3 project along their axes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mounted on a vertical rotary table type surface grinder or a vertical axis reciprocating table type surface grinder to efficiently and precisely measure the flat surface of an object to be ground. The present invention relates to a segment grindstone unit for grinding.

[0002]

2. Description of the Related Art Conventional vertical axis rotary table type surface grinders and vertical axis reciprocating table type surface grinders are widely used for processing metal parts because they can process flat surfaces with high efficiency. However, the area and material of the parts to be ground are different depending on the parts, so in order to prevent grinding burn and efficiently obtain a predetermined finished surface roughness, it is necessary to perform optimum grinding each time. In addition, it is necessary to select and use the abrasive material of the grinding wheel, the degree of bonding, and the structure. Therefore, a rotary support member that fixedly holds a plurality of segment grindstone pieces is attached to the grinder grindstone shaft to make a grindstone unit for vertical axis surface grinding, and select grindstone segments according to the grinding area and material of the parts to be ground. It has been made easy to replace and use.

On the other hand, ultra-hard abrasive grains such as CBN and diamond abrasive grains are most suitable for grinding parts made of high hardness steel, heat-resistant alloys, or ceramics materials, and are now widely used. However, these ultra-hard abrasive wheels are generally used to directly bond and fix pieces of ultra-hard abrasive wheels to a base made of an aluminum alloy, so these super-abrasive wheels with excellent grinding ability are produced exclusively for a fixed flow of parts. Since grindstones do not need to be changed frequently in lines, etc., they have been used more and more effectively. With the recent advances in industrial technology, the weight of mechanical parts is becoming lighter and the life of the parts is becoming smaller, even for small-volume production parts. Materials such as steel and heat-resistant alloy ceramics have come to be used.

[0004]

However, even in the field of vertical surface grinders, these ultra-hard abrasive wheels have heretofore been known as those in which the end surfaces of a rotary support made of an aluminum alloy contain the ultra-hard abrasive wheels dispersed therein. A grindstone unit in which small pieces are bonded and fixed is used, and the grindstone unit must be replaced and used each time according to the material of the component to be ground and the area of the ground component, and it was not widely used. Because of the excellent life of ultra-hard abrasive grains such as diamond and CBN, the ratio of the grindstone volume consumed to the grinding volume of the grind is small, but the wobble of the working surface of the grindstone relative to the rotating shaft is changed every time the grindstone is replaced. This is because the excellent characteristics of the ultra-hard abrasive grain stone cannot be brought out unless it is removed and used. This work of removing the rotational runout of the grinding work surface of the grindstone unit is called “tooling”.
Compared with a general grindstone using a general abrasive material such as a cutting tool, the grindstone itself is superior in wear resistance, so that it takes time with a special tooling method.

This problem is not solved even in the conventional grindstone unit in which the segment grindstone is fixed to the rotary support, and the grinding work surface of the grindstone unit is replaced every time a plurality of grindstone segments are replaced. It takes a lot of time to remove the rotational shake. In other words, because the ultra-hard abrasive grain wheel segments mainly composed of metal columnar substrates are simply fixed to the rotation history one by one, there is a large variation in the protrusion height of each segment, making it impossible to make fine adjustments. As a result, the amount of removal is too large to remove by truing as it is, and it is also wasteful for most of the ultra-hard abrasive stone fragments that are 3 mm to 7 mm in the normal wear direction. It became

[0006]

The segment grindstone unit of the present invention finely adjusts the protrusion height variation of each grindstone segment at the time of exchanging each grindstone segment to minimize the removal amount of the super-hard abrasive grain grindstone at the time of truing. As a limit, in order to make the conventional rotary support easier to use, a protrusion height adjusting mechanism is provided.

[0007]

The segment grindstone unit of the present invention is provided with a tightening mechanism for fixing a plurality of super-hard abrasive grain grindstone segments to the rotary support. A base of each of the grindstone segments is made of a metal such as an aluminum alloy, and a superhard abrasive grain grindstone piece is adhered and fixed to an end face in the longitudinal direction of the grindstone segment base. A guide mechanism is provided on each of the rotary supports, which are usually made of steel, so that the grindstone segments can be moved back and forth in the rotation axis direction. Each grindstone segment temporarily fixed to the rotary support is fed by
The protrusion heights are made uniform with respect to each other, and after adjustment, they are surely fixed to the support body, and then they are tuned, and usually, after further treshing, grinding is started. With this new whetstone segment protrusion height adjustment mechanism, the protrusion height variation of each whetstone segment before truing can be easily suppressed from the conventional millimeter range to 0.02 mm to 0.05 mm, greatly improving work efficiency. Is improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described in more detail below with reference to the drawings. FIGS. 1 to 6 show an embodiment of a segment grindstone unit according to the present invention. Rectangular grooves 2 are provided at equal intervals on the outer peripheral surface of the rotation history 1 itself. A grindstone segment base body 3 made of an aluminum alloy is inserted into the groove 2, and the grindstone segment base body 3 is fixed to the rotary support 1 by a tightening screw member 4. At least one contact surface 2a between the grindstone segment base body 3 and the rotary support 1 has a feed screw member 6 inserted in a half-moon shape. A female screw groove 7 that meshes with the feed screw member 6 is provided in a half-moon shaped groove provided in the rotary support 1. On the side of the grindstone segment base 3, a half-moon shaped recess 5 in which the feed screw member 6 is rotatably enclosed is provided, and a feed screw is fed by a hexagon wrench or the like through a communication groove 8 opened toward the end face of the rotary support 1. The structure is such that the member 6 is rotated to adjust the protrusion height direction of the grindstone segment base body 3.

Naturally, in addition to the contact surface 2a, 2
b, 2c may be provided on each of the plurality of surfaces as required. Needless to say, a grindstone piece 3c using ultra-hard abrasive grains such as diamond or CBN is adhered and fixed to at least one of the end surface sides of the grindstone segment base body 3. In particular, by providing screw feed mechanisms symmetrically on both sides of the contact surface 2a2b, it is possible to provide ultra-hard abrasive grindstone pieces on both sides of the end surface of the grindstone segment base body 3 for proper use.

5 and 6 show a second embodiment of the present invention. In this embodiment, the means for fixing the grindstone segment base body 3 to the rotary support 1 is a wedge-shaped tightening member 9, and the wedge-shaped tightening member 9 is a tightening screw 10.
The tightening is done by. On the other hand, the tightening bolt 4 on the grindstone segment base 3 side shown in the figure has the same structure as that of the first embodiment, but can be used as a temporary fixing means for the wedge-shaped tightening means.

Although not shown, the main screw member 10 may be a tightening bolt having a right-hand screw on the tip side of the rotary support 1 and a left-hand screw on the wedge-shaped tightening member 9 side, in which case the wedge-shaped tightening member 9 side. If a left female screw is applied to the wheel, the wedge can be easily applied or loosened by the rotation of the tightening bolt, and it is easy to adjust the forward / backward movement of the grindstone segment base body 3.

[0012]

As described above, according to the present invention, since the protrusion height of the grindstone segment attached to the segment grindstone unit can be easily adjusted, it must be removed in the truing dressing work performed before the start of grinding. The grinding amount of ultra-hard abrasive grain pieces can be minimized, and the truing dressing work can be greatly shortened. Further, it is possible to firmly and surely fix the grindstone segment base body 3 to the rotary support 1 by using wedges.
Further, the protrusion height of the grindstone segment base body 3 can be easily and reliably adjusted with a small rotating force by using a hexagon wrench or the like. Further, it is not necessary to perform complicated processing on the grindstone segment base body 3 that is frequently replaced, and a lightweight soft material can be selected for other components, so that not only weight reduction but also wear occurrence is selectively concentrated on replacement parts. it can.

[Brief description of drawings]

FIG. 1 is a plan view of a segment grindstone of the present invention.

FIG. 2 is a front view of a segment grindstone of the present invention.

FIG. 3 is a sectional view taken along the line AA of the segment grindstone of the present invention.

FIG. 4 is a cross-sectional view showing a state where the screw member shown in the AA cross section of FIG. 3 is removed.

FIG. 5 is a plan view showing another embodiment of the segment grindstone of the present invention.

FIG. 6 is a front view of the segment grindstone of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotating support 2 Grooves 2a Groove wall surface (contact surface) 3 Grindstone segment base 3a Grindstone segment base side surface 3b Grindstone segment base center 3c Grindstone segment base grindstone chip bottom surface 3d Grindstone segment base inclined surface 4 Tightening screw member 5 recessed part 6 screw member 6a hexagonal hole of screw member 7 female screw groove 8 communication groove 9 wedge-shaped tightening member 9a inclined surface of wedge-shaped tightening member 10 tightening screw member

Claims (4)

[Claims] 1. A grindstone segment base projecting from axial end surfaces of a plurality of the rotary supports is detachably attached to an outer peripheral surface of the rotary support that rotates around a grindstone axis for grinding a flat surface portion of a workpiece. In the grindstone unit, the grindstone segment base comprises a columnar metallic grindstone segment base and a grindstone piece containing ultra-hard abrasive grains such as diamond or CBN fixed to the longitudinal end of the segment base. And a fixing mechanism for removably fixing the grindstone segment base body to the rotary support, and the protrusion height in the axial direction of the rotary support body of each grindstone segment base body fixed to the rotary support body. In order to make uniform adjustment, each of the whetstone segment bases is provided with a screw feed mechanism capable of advancing and retracting in the moving direction of each of the whetstone segment bases. A segment grindstone unit characterized by being equipped. 2. A grindstone unit in which a plurality of grindstone segment bases are detachably attached to an outer peripheral end of a support body as a rotating body for grinding a flat surface portion of a workpiece.
The grindstone segment base is a columnar metal strut and diamond or C fixed to the longitudinal end of the metal strut.
It consists of a small piece of whetstone made of ultra-hard abrasive grains such as BN,
The support is provided with a fixing mechanism for removably fixing the grindstone segment base body, and the axial protrusion height of the grindstone pieces of each grindstone segment base body fixed to the support body in the rotation center axis direction of the support body. In order to adjust uniformly, with a screw feed mechanism capable of advancing and retracting in parallel to the moving direction of each of the grindstone segment bases, the fixing mechanism of the grindstone segment bases to the support, the moving direction of the grindstone segment bases A segment grindstone unit comprising a structure in which the grindstone segment base body and the support are detachably fixed by a wedge that moves in an intersecting direction. 3. A screw feed mechanism capable of advancing and retreating, a substantially semi-cylindrical recess provided in the grindstone segment base, a screw main body relatively associated with the recess, and the support provided in the support. The segment grindstone unit according to claim 1 or 2, wherein the segment grindstone unit is configured by a screw groove formed with a substantially semicircular female screw that fits with the screw body. 4. The wedge mechanism is provided with an inclined portion in a wedge advancing direction at a contact portion with the metal strut,
The segment grindstone unit according to claim 2 or 3, further comprising a tightening bolt arranged parallel to the progress of the wedge.