JPH0560760U - Centerless grinding machine for stepped workpieces - Google Patents

Abstract

(57) [Summary] [Purpose] The centerless grinding device for stepped workpieces has been improved to eliminate the problem of slippage caused by the difference in peripheral speed of the grindstone between the large diameter part and the small diameter part, and achieve high precision grinding. to enable. [Structure] A grinding wheel 7 for grinding a large diameter portion and a grinding wheel 8 for grinding a small diameter portion are separately configured, and an adjusting wheel 9 for grinding a large diameter portion and an adjusting wheel 10 for grinding a small diameter portion are provided. Is configured as a separate body, and the four grindstones are rotationally driven by independent drive mechanisms 11, 12, 13, and 14 so that the peripheral speed can be controlled.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an apparatus for centerless grinding a stepped cylindrical workpiece having a concentric large diameter portion and a small diameter portion.

[0002]

[Prior Art]

 2A and 2B show a conventional example of an apparatus for centerless grinding a stepped cylindrical workpiece 1, where FIG. 2A is a schematic plan view and FIG. 2B is a front view. Since the workpiece 1 has a large-diameter portion and a small-diameter portion, the grinding wheel 2 and the adjusting grindstone 3 are provided with a large-diameter portion and a small-diameter portion, respectively. The workpiece 1 is supported by the blade 4, and the large diameter portion of the adjusting grindstone 3 and the large diameter portion of the grinding wheel 2 slide against the small diameter portion of the workpiece 1 to perform centerless grinding of the small diameter portion. At the same time, the small-diameter portion of the adjusting grindstone 3 and the small-diameter portion of the grinding stone 2 are brought into sliding contact with the large-diameter portion of the workpiece 1 to perform centerless grinding of the large-diameter portion.

[0003]

[Problems to be solved by the device]

 In the conventional centerless grinding machine described with reference to FIG. 2, the stepped integrated grinding wheel and the stepped integrated adjustment wheel are provided in accordance with the shape of the stepped workpiece. The grinding wheel peripheral speed adjustment for large-diameter portion grinding and the grinding wheel peripheral speed adjustment for small-diameter portion grinding cannot be performed independently. Therefore, the difference in the diameter of the grindstone corresponding to the diameter difference between the large diameter portion and the small diameter portion of the stepped work causes a difference in peripheral speed, which causes an unstable factor during grinding. In particular, since the adjusting grindstone is a member that controls the rotation speed of the workpiece, it is not preferable that slipping occurs between the workpiece and the adjusting grindstone because it adversely affects the processing accuracy. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an apparatus capable of performing centerless grinding of a large-diameter portion and a small-diameter portion of a stepped workpiece simultaneously and with high accuracy.

[0004]

[Means for Solving the Problems]

 The structure of the present invention for achieving the above object will be described with reference to FIG. 1 corresponding to the first embodiment. A grinding wheel 7 for a large diameter portion and a grinding wheel 8 for a small diameter portion are separately provided. In addition to the above, the driving means 11 and 12 are rotationally driven so that the peripheral speeds of the respective grinding wheels 7 and 8 can be controlled independently of each other. In addition, the adjusting grindstone 9 for the large diameter portion and the adjusting grindstone 10 for the small diameter portion are separately configured, and are rotationally driven by the driving means 13 and 14, respectively, so that the peripheral speed of each of the adjusting grindstones 9 and 10 is independent. To be able to control.

[0005]

[Action]

 According to the above configuration, the peripheral speeds of the grinding wheel and the adjusting grindstone for the large diameter portion, and the grinding wheel and the adjusting grindstone for the small diameter portion can be independently controlled. Centerless grinding can be performed by adjusting the speed appropriately as desired. Therefore, the peripheral speed difference, which has been an unstable factor in the conventional centerless grinding machine described with reference to FIG. 2, can be eliminated, and the large-diameter portion and the small-diameter portion of the stepped workpiece can be simultaneously accurately processed. Centerless grinding is possible.

[0006]

【Example】

 FIG. 1 shows an embodiment of a centerless grinding apparatus according to the present invention, (A) is a plan view and (B) is a front view. The stepped work piece 1 is supported from below by a blade 4, as shown in FIG. The grinding wheel 7 for centerless grinding the large diameter portion of the work piece 1 and the adjusting wheel 9 have a structure in which they are rotationally driven independently by drive mechanisms 11 and 13, respectively, as shown in FIG. , Each can be adjusted to the desired peripheral speed. Further, the grinding wheel 8 for centerless grinding the small diameter portion of the stepped workpiece 1 and the adjusting wheel 10 similarly have a structure in which they are independently driven to rotate by the driving mechanisms 12 and 14, respectively, and each has a desired circumference. Can be adjusted for speed. The large-diameter portion adjusting grindstone 9 and the small-diameter portion adjusting grindstone 10 can be cut and fed as indicated by reciprocating arrows a and b, respectively. Instead of the structure in which the adjusting grindstones 9 and 10 can be cut and fed as described above, the grindstone 7 for the large diameter portion and the grindstone 8 for the small diameter portion are cut and fed as indicated by the reciprocating arrows a'and b '. It may be possible structure. According to the centerless grinding apparatus of the present embodiment configured as described above, the peripheral speeds of the pair of the grinding wheel 7 and the adjusting grindstone 9 are different from each other for the centerless grinding of the large diameter portion of the workpiece 1. While adjusting the peripheral speed to an appropriate peripheral speed and performing centerless grinding of the large diameter portion under appropriate conditions, in parallel with this, the peripheral speeds of the pair of grinding wheels 8 and the adjusting wheel 10 are different from each other. It is possible to perform centerless grinding on the small diameter portion under appropriate conditions by adjusting the peripheral speed to be suitable for centerless grinding of the first small diameter portion. Centerless grinding of the large diameter portion and the small diameter portion at the optimum peripheral speeds as described above enables highly accurate centerless grinding of both the large diameter portion and the small diameter portion. That is, the instability factor caused by the difference in the peripheral speed of the grindstone between the large diameter portion and the small diameter portion, which has been described in the conventional apparatus shown in FIG. 2, is eliminated, and the large diameter portion and the small diameter portion of the stepped workpiece are eliminated. It is possible to perform centerless grinding with high precision at the same time as the part. In the present embodiment shown in FIG. 1, the adjusting grindstone 10 for the small diameter portion and the grinding grindstone 8 are configured to be reciprocally movable in the axial direction as indicated by reciprocating arrows c and d. With this configuration, when the centerless grinding machine is serviced, the grindstones 8 and 10 for the small diameter portion can be separated from the grindstones 7 and 9 for the large diameter portion, so that the grindstone replacement work can be easily performed. be able to. As can be easily understood from this action and effect, even if the grindstones 9 and 7 for the large diameter portion can be moved as shown by the reciprocating arrows c ′ and d ′, the same effect (the grindstone can be easily replaced) can be obtained. can get.

Further, as described above, when the grindstone is configured so as to be movable in the axial direction, a large diameter portion and a small diameter portion to be centerless ground are added in the axial direction. It is suitable for centerless grinding of a work.

[0008]

[Effect of the device]

 As described above, according to the device of the present invention, it is possible to perform centerless grinding of each of the stepped cylindrical large diameter portion and the small diameter portion at the optimum peripheral speed, so that the circumference of the large diameter portion and the small diameter portion can be reduced. High precision circular finishing can be achieved by the circular action unique to centerless grinding without causing slippage problems due to speed differences.

[Brief description of drawings]

1 is a plan view and a front view showing an embodiment of a centerless grinding apparatus according to the present invention.

2A and 2B are a plan view and a front view showing a conventional example of a centerless grinding apparatus for a stepped workpiece.

[Explanation of symbols]

1 ... Workpiece, 2 ... Conventional stepped grinding wheel, 3 ... Conventional stepped adjusting wheel, 4 ... Blade, 5, 6 ... Drive mechanism, 7 ... Large diameter grinding wheel, 8 ... Grinding grindstone for small diameter part, 9 ... Adjusting grindstone for large diameter part, 10 ... Adjusting grindstone for small diameter part, 11 ... Driving mechanism of grinding grindstone for large diameter part, 12 ... Driving mechanism of grinding grindstone for small diameter part , 13 ... Drive mechanism for adjusting grindstone for large diameter portion, 14 ... Drive mechanism for adjusting grindstone for small diameter portion.

Claims (2)

[Scope of utility model registration request] 1. A grinding wheel for a large diameter portion provided with a rotation driving means capable of controlling a peripheral speed, and a grinding wheel for a small diameter portion provided with a rotation driving means capable of controlling a peripheral speed and configured separately from the above. With a whetstone
Each of the above-mentioned components including a large-diameter portion adjusting grindstone that is provided separately from each of the above-described components and that includes a rotation driving unit that can control the peripheral speed, and a rotation driving unit that can control the peripheral speed. A stepped machining, characterized in that it comprises a member and an adjusting grindstone for a small diameter portion formed separately, and the four rotation driving means have a structure capable of controlling the peripheral speed independently of each other. Centerless grinding machine for objects. 2. A grindstone for a large diameter portion and / or a grindstone for a small diameter portion has a structure that can be moved in the axial direction, and the large diameter portion adjusting grindstone and the small diameter portion adjusting grindstone. 2. The centerless grinding apparatus for a stepped work piece according to claim 1, wherein at least one of the steps has a structure capable of moving in the axial direction.