JP4099382B2 - Internal grinding machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an inner diameter grinding apparatus, and more particularly, to an inner diameter grinding apparatus that performs constant pressure profiling grinding on the inner surface of a tube inner diameter.
[0002]
[Prior art]
As a conventional inner diameter grinding method, there is a processing method by positioning cutting control using an NC device, or a honing process in which a grindstone is spread over the entire inner diameter for grinding.
[0003]
However, the machining method based on the positioning cut control by the conventional NC device requires a degree of freedom in two directions with respect to the hole diameter, and the device becomes large and expensive. Further, in honing, it is necessary to make the shape of the grindstone equal to the inner diameter of the tube body. In order to cope with the change in the inner diameter of the tube body, it is necessary to change the grindstone shape each time.
[0004]
Further, as shown in FIG. 4 of Patent Document 1, there is an inner diameter grinding device that uses two control motors to move the grindstone in the tube diameter (X-axis) direction and the tube centerline (Z-axis) direction. Furthermore, in order to eliminate these drawbacks, the movement axis for performing the movement in the linear direction and the radial direction is not two linear axes that are perpendicular to each other as in the prior art, but is slightly close to the axial center of the machining tool. There is an internal diameter grinding device (Patent Document 1) in which only one linear axis is displaced by a certain distance.
[0005]
However, since the inner diameter grinding apparatus described in Patent Document 1 does not have a tube centering and centering mechanism, it is not particularly suitable for inner diameter grinding of a large-sized tube body. As a result, the apparatus becomes large and expensive.
[0006]
[Patent Document 1]
Japanese Unexamined Patent Publication No. 11-156682 (paragraph numbers [0009] and [0013], FIG. 1)
[0007]
[Problems to be solved by the invention]
The present invention has been made in consideration of the above-described circumstances, and it is not necessary to change the shape of the grindstone depending on the inner diameter of the tube body, the structure is simple and inexpensive, and it is suitable for inner diameter grinding of large tubes. The purpose is to provide.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, according to one aspect of the present invention, a grinding wheel spindle to which a grinding wheel for grinding an inner surface of a rotating tubular body is attached and an upper core of an upper positioning centering mechanism for determining a reference position of the tubular body inner diameter. A support member to which the exit cone is attached, an elevating mechanism for raising and lowering the support member, a horizontal movement mechanism having one cylinder for moving the support member back and forth in a horizontal plane, and a lower positioning core having a lower center cone And a workpiece rotating mechanism that chucks and rotates the outer surface of the tubular body. The hoisting spindle and the upper centering cone are moved up and down at the same time by the elevating mechanism, and the grindstone is moved by the horizontal mechanism. by moving the upper centering cone spindle simultaneously in a horizontal plane switching positions therebetween, the positioning centering of the upper centering cone by the tube grindstone spindle Inner diameter grinding apparatus for the O is pressed to the tube inner surface, wherein the selectively performing the is provided. Thereby, there is no need to change the shape of the grindstone depending on the inner diameter of the tube body, and an inner diameter grinding apparatus that is simple and inexpensive and suitable for inner diameter grinding of a large tube body is realized.
[0009]
In a preferred example, an air sensor is installed in a spindle housing through which the spindle passes, and the wear limit of the grindstone is detected to prevent interference between the spindle and the inner surface of the pipe body. Thereby, even if the grindstone is abnormally worn, the tube body is not damaged by the spindle.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of an inner diameter grinding apparatus according to the present invention will be described below with reference to the accompanying drawings.
[0011]
FIG. 1 is a conceptual diagram showing a side of an inner diameter grinding apparatus according to the present invention, and FIG. 2 is a conceptual diagram showing the front thereof.
[0012]
As shown in FIGS. 1 and 2, an inner diameter grinding apparatus 1 according to the present invention includes a grindstone spindle 2 to which a grindstone 2a that grinds the inner surface of a rotating tube P, for example, a silica glass tube, and a tube inner diameter. A support member 4 to which the upper centering cone 3a of the upper positioning centering mechanism 3 for determining the reference position is attached, an elevating mechanism 5 for moving the support member 4 up and down, and one support member 4 for moving the support member 4 back and forth in the horizontal direction. A horizontal movement mechanism 6 having a cylinder 6a, a lower positioning centering mechanism 7 having a lower centering cone 7a, and a work rotating mechanism 8 for chucking and rotating the tube P are provided.
[0013]
As shown in FIGS. 3 and 4, the grindstone spindle 2 includes a grindstone 2a and a spindle 2c to which the grindstone 2a is attached via a collet chuck 2b. The spindle 2c is an elongated hollow housing 2d. The housing 2d is provided with an air sensor 2e. The grindstone spindle 2 is attached to a support member 4 and is further rotated via a belt 2g by a spindle drive motor 2f placed on the support member 4.
[0014]
Further, the upper positioning centering mechanism 3 is attached to the support member 4, and the upper centering cone 3 a is arranged in parallel with the grindstone spindle 2.
[0015]
The upper positioning centering mechanism 3 includes an upper centering cone 3a, and the upper centering cone 3a is rotatably mounted via a bearing (not shown), and is always pressed downward by a spring (not shown). The mounting member 3b includes a support ring member 3c that supports the mounting member 3b.
[0016]
As shown in FIG. 5, the support member 4 is pivotally supported by the elevating member 5a of the elevating mechanism 5, and as shown in FIGS. 6 and 7, one of the horizontal movement mechanisms 6 attached to the elevating member 5a. The cylinder 6a is pushed and pulled to rotate, so that the grindstone spindle 2 and the upper centering cone 3a can be simultaneously moved in a horizontal plane.
[0017]
As shown in FIGS. 1 and 5, the elevating mechanism 5 elevates and lowers the support member 4 pivotally supported by the elevating member 5a to simultaneously elevate and lower the grindstone spindle 2 and the upper centering cone 3a. The support 5b includes a support column 5b that can be moved up and down, a ball screw 5c that is screwed up and down with the lifting member 5a, and a lifting motor 5d that rotates the ball screw 5c.
[0018]
As shown in FIG. 8, the lower positioning centering mechanism 7 includes a lower centering cone 7a and the lower centering cone 7a rotatably mounted via a bearing 7b, and can be moved up and down by an air cylinder 7c. Yes.
[0019]
Further, as shown in FIG. 8, the work rotation mechanism 8 is provided directly above the lower centering cone 7a. The work rotation mechanism 8 chucks the outer surface of the tube P , and the lower centering cone. The chuck 8a is provided with a through hole 8b through which 7a passes, and the chucked tube P is rotated.
[0020]
Reference numeral 9 denotes an apparatus control unit.
[0021]
Next, an inner diameter grinding method for a pipe body using the inner diameter grinding apparatus according to the present invention will be described with reference to a processing operation flowchart shown in FIG.
[0022]
As shown in FIG. 1 and FIG. 2, the support member 4 is moved up and down by the lifting mechanism 5 through the lifting member 5a so that the grindstone spindle 2 and the upper centering cone 3a are simultaneously upward and the upper centering cone 3a is the workpiece. The tube P is placed on the work rotation mechanism 8 in a standby state facing the rotation mechanism 8 and the lower centering cone 7a (FIG. 9A).
[0023]
Next, the support member 4 is lowered by the lifting mechanism 5 so that the upper centering cone 3a is inserted into the hollow portion of the pipe body P. At the same time, the lower centering cone 7a is raised by the air cylinder 7c, The rotating mechanism 8 is penetrated, the lower centering cone 7a is inserted into the hollow portion of the tube P, the tube P is finely moved on the work rotating mechanism 8 to perform positioning centering, and after the centering, the chuck 8a , The tube P is chucked by the work rotation mechanism 8 on its outer surface . (FIG. 9B).
[0024]
Again, the support member 4 is raised and lowered by the lifting mechanism 5 to simultaneously return the grindstone spindle 2 and the upper centering cone 3a to the upper standby position, and further lower the lower centering cone 7a to the standby position (FIG. 9). (C)).
[0025]
Thereafter, the cylinder 6a of the horizontal moving mechanism 6 is operated to rotate the support member 4, and the grindstone spindle 2 and the upper centering cone 3a are simultaneously moved in the horizontal plane, so that the grindstone spindle 2 is hollow in the tube P. It is made to oppose to a part (FIG.9 (d)).
[0026]
Further, the support member 4 is lowered by the elevating mechanism 5, and the grindstone 2a of the grindstone spindle 2 is positioned at the upper end of the inner surface (hollow portion) of the tube P to be ground (FIG. 9 (e)).
[0027]
The cylinder 6a of the horizontal movement mechanism 6 is actuated to rotate the support member 4, and the grindstone spindle 2 and the upper centering cone 3a are simultaneously moved in the horizontal plane, so that the grindstone 2a is hollow in the tube P to be ground. It is pressed against the upper end of the part with a constant pressure (FIG. 9 (f)).
[0028]
Further, in a state where the grindstone 2a is pressed against the hollow portion of the tubular body P with a constant pressure, the support member 4 is lowered by the elevating mechanism 5 via the elevating member 5a, while the spindle driving motor 2f causes the belt 2g and the spindle 2c to pass through. The inner surface of the tube P rotated by the workpiece rotating mechanism 8 is ground by the grindstone 2a rotated in this manner (FIG. 9 (g)).
[0029]
The grinding amount is accurately controlled by the suction amount of the cylinder 6a. Even if the grindstone 2a is abnormally worn, an air sensor 2e is attached to the housing 2d of the grindstone spindle 2, and the spindle 2b and the tube P are Since the distance is detected, the spindle 2b and the tube P do not interfere and the tube P is not damaged.
[0030]
Through the grinding process as described above, the inner diameter of the tube body P is ground, but the grinding stone 2a is pressed against the hollow portion of the tube body at a constant pressure by a single cylinder 7c, so that the grinding is controlled by the NC device. The equipment is simple and inexpensive, and unlike honing, it is not necessary to make the shape of the grindstone equal to the inner diameter of the tube, and it is necessary to change the grindstone shape each time the tube inner diameter changes. There is no. Further, even if the apparatus has positioning and centering mechanisms 3 and 7 and is suitable for inner diameter grinding of a large tubular body, the grindstone spindle 2 and the upper centering cone 3a are moved in the plane by one air cylinder 7c. Since it is moved, the structure becomes simple and the apparatus becomes inexpensive.
[0031]
【The invention's effect】
According to the inner diameter grinding apparatus according to the present invention, it is not necessary to change the shape of the grindstone depending on the inner diameter of the pipe body, and it is possible to provide an inner diameter grinding apparatus which is simple in structure and inexpensive and suitable for inner diameter grinding of a large pipe body. Can do.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram showing a side surface of an inner diameter grinding apparatus of an inner diameter grinding apparatus according to the present invention.
FIG. 2 is a conceptual diagram showing the front of an inner diameter grinding apparatus according to the present invention.
FIG. 3 is a conceptual diagram showing a side surface of a grindstone spindle and an upper positioning centering mechanism used in an inner diameter grinding apparatus according to the present invention.
FIG. 4 is a conceptual diagram showing the front of a grindstone spindle and an upper positioning centering mechanism used in an inner diameter grinding apparatus according to the present invention.
FIG. 5 is a conceptual diagram showing a plane of a grindstone spindle and an upper positioning centering mechanism used in an inner diameter grinding apparatus according to the present invention.
FIG. 6 is a conceptual diagram showing an operating state of an air cylinder used in the inner diameter grinding apparatus according to the present invention.
FIG. 7 is a conceptual diagram showing an operating state of an air cylinder used in the inner diameter grinding apparatus according to the present invention.
FIG. 8 is a conceptual diagram showing the front of a workpiece rotating unit and a lower positioning centering mechanism used in the inner diameter grinding apparatus according to the present invention.
FIG. 9 is a processing operation flowchart of the inner diameter grinding apparatus according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Inner diameter grinding machine 2 Grinding wheel spindle 2a Grinding wheel 2b Collet chuck 2c Spindle 2d Housing 2e Air sensor 2f Spindle drive motor 2g Belt 3 Upper positioning centering mechanism 3a Upper centering cone 3b Mounting member 3c Support ring member 4 Support member 5 Lifting mechanism 5a Lifting Member 5b Post 5c Ball screw 5d Lifting motor 6 Horizontal movement mechanism 6a Cylinder 7 Lower positioning centering mechanism 7a Lower centering cone 7b Bearing 7c Air cylinder 8 Work rotating mechanism 8a Chuck 8b Through hole 9 Device control part P Tube

Claims (2)

A support member to which a grindstone spindle to which a grindstone for grinding an inner surface of a rotating tube body is attached and an upper centering cone for an upper positioning centering mechanism for determining a reference position of the inside diameter of the tube body is attached, and the support member is moved up and down. An elevating mechanism, a horizontal moving mechanism having one cylinder for moving the support member back and forth in a horizontal plane, a lower positioning centering mechanism having a lower centering cone, and a work rotating mechanism for chucking and rotating the outer surface of the tube body The hoisting spindle and the upper centering cone are simultaneously moved up and down by the elevating mechanism, and both the whetstone spindle and the upper centering cone are simultaneously moved in a horizontal plane by the horizontal mechanism . position switched, and wherein selectively performing the O by pressing to the tube inner surface of the upper centering tube positioning centering by cone the grindstone spindle That the inner diameter grinding apparatus.   2. The grinding apparatus according to claim 1, wherein an air sensor is installed in a spindle housing through which the spindle penetrates to detect a wear limit of the grindstone to prevent interference between the spindle and the inner surface of the tube body. Processing equipment.

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