JP2009095963A - Method for manufacturing workpiece, and grinding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a method and a device for manufacturing a workpiece that allow sure grinding of the inner edge angle part of a hole, using a coil-shaped elastic spring. <P>SOLUTION: A grinding spring body 11 is arranged on the other side of a hole 19a, in advance, and a first end part 12c is extracted to one side of the hole 19a through the hole 19a, while the first end part 12c is moved to one side, the elastic spring 12 is extended in an axis direction and an outer diameter is reduced; subsequently, a second end part 12d is moved to one side, the elastic spring 12 is shortened in the axial direction on the one side of the hole 19a, and the outside diameter of at least a part on the side of the first end part 12c of the axis direction of the elastic spring 12 is increased to be larger than the inside diameter of the hole 19a; thereafter, the outer peripheral part of the elastic spring 12 is made to continuously abut against the inner edge angle part 19b, in the circumferential direction, in a process of moving the elastic spring 12 to the other side and drawing the elastic spring 12 into the hole 19a from the one side of the hole 19a; and the inner edge angle part 19b is ground into a circular shape by a cutting edge 12b. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a workpiece manufacturing method and a grinding apparatus, and more particularly, to a manufacturing method and an apparatus suitable for removing burrs on an inner corner portion of a hole or grinding.

  Generally, when a hole is formed in a workpiece made of a metal material or the like, it is necessary to grind and remove the burr by applying a tool to the inner edge corner to remove the burr formed at the inner edge corner of the hole opening. was there. However, such an operation is complicated, and it is necessary to adjust the grinding operation in accordance with the inner diameter and depth of the hole, which has been an obstacle to reducing the manufacturing cost of the workpiece.

Conventionally, as a method for removing burrs at the inner edge corner of a hole and a method for internal grinding of a hole, various methods using an elastic spring wound in a spiral shape as a tool have been devised (Patent Documents 1 to 5 below). reference). For example, in the method disclosed in Patent Document 1, after the coiled spring member is introduced into the hole, the diameter of the spring member is increased while shortening, and then the outer peripheral portion of the spring member is brought into contact with the inner surface of the hole. And a method of removing the burrs formed at the corners of the inner edge of the hole by pulling it up.
Japanese Patent Laid-Open No. 5-200530 Japanese Patent Laid-Open No. 7-60540 Japanese Patent Application Laid-Open No. 55-120981 JP-A-6-262432

  However, in the above-described method, the spring member can be pulled out from the inside of the hole by pulling out the spring member from the inside of the hole, so that the burr at the inner edge corner can be hooked and folded outward. Therefore, there is a problem that burrs cannot be reliably removed or the inner edge corners cannot be ground.

  Moreover, although the said patent documents 2 thru | or 4 have described the method of grind | polishing the inner surface of a hole by providing a cutting edge substantially on the outer peripheral part of a spring member, or making an abrasive grain adhere, Since a random polishing operation based on vibration and expansion / contraction action is used, there is a problem that the inner edge corner portion of the hole cannot be reliably ground as described above.

  Therefore, the present invention solves the above-mentioned problems, and the problem is that a method of manufacturing a workpiece capable of reliably grinding the inner edge corner of a hole using a grinding spring body having a coiled elastic spring and To implement the device.

  In view of such a situation, the method for manufacturing a workpiece according to the present invention includes an elastic spring wound in a coil shape, and extends along at least a part of the outer peripheral portion of the elastic spring along the extending direction of the elastic spring. A method of manufacturing a workpiece, comprising a step of grinding an inner edge corner portion of an opening on one side of a hole formed in the workpiece using a grinding spring body in which a continuous blade edge is formed, A grinding spring body is preliminarily disposed on the other side of the hole, the first end of the elastic spring is moved to the one side, the elastic spring is stretched in the axial direction, and the outer diameter is reduced to reduce the outer diameter. One end is extracted to one side of the hole, and then the second end opposite to the first end is moved to the one side to move the elastic spring on the one side of the hole. At least the first end of the elastic spring in the axial direction In the process of increasing the outer diameter of the portion on the side, making the outer diameter larger than the inner diameter of the hole, and then moving the elastic spring to the other side and drawing it into the hole from one side of the hole, The outer peripheral portion of the elastic spring is continuously brought into contact with the inner edge corner portion in a circumferential direction, and the inner edge corner portion is ground in a circular shape by the blade edge.

  Another method of manufacturing a workpiece according to the present invention includes an elastic spring wound in a coil shape, and is continuous with at least a part of the outer peripheral portion of the elastic spring along the extending direction of the elastic spring. A method for manufacturing a workpiece, comprising a step of grinding an inner edge corner portion of an opening on one side of a hole formed in the workpiece using a grinding spring body formed with a cutting edge, wherein the elastic spring At least a portion on the first end side in the axial direction is shortened in the axial direction to increase its outer diameter, the outer diameter is configured to be larger than the inner diameter of the hole, and is disposed on one side of the hole, The second end portion opposite to the first end portion is moved to the other side through the hole, and the portion on the second end portion side of the elastic spring is stretched in the axial direction from one side of the hole. In the process of pulling into the hole, the outer peripheral portion of the elastic spring is moved to the inner edge. Continuously brought into contact with the circumferential direction with respect to part, characterized in that continue to grind to circumferentially the inner corners at the cutting edge.

  In the present invention, before the portion of the elastic spring on the first end portion side in the axial direction is disposed on one side of the hole, the grinding spring body is disposed on the other side of the hole in advance, One end is moved to the one side, the elastic spring is stretched in the axial direction to reduce the outer diameter, the first end is pulled out to one side of the hole through the hole, and then the second Moving the end to the one side shortens the elastic spring in the axial direction on one side of the hole, and increases the outer diameter of at least the portion of the elastic spring on the first end side in the axial direction It is preferable.

  Further, the grinding device of the present invention has an elastic spring wound in a coil shape, and a cutting edge continuous along the extending direction of the elastic spring is formed on at least a part of the outer peripheral portion of the elastic spring. A ground spring body, a first drive member attached to the first end of the elastic spring, passing through the inside of the elastic spring in the axial direction, and protruding from the second end of the elastic spring, and the elastic spring A second drive member attached to the second end of the first drive member and extending in parallel with the first drive member, and changing a relative positional relationship in the axial direction of the first drive member and the second drive member. Thus, the elastic spring extends in the axial direction and decreases in outer diameter, shortens in the axial direction and increases in outer diameter, and the second drive member is configured in a substantially cylindrical shape. The first drive member is 2 is inserted inside the drive member, characterized in that it is slidably guided in the axial direction by said second drive member.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows the overall configuration of a grinding apparatus according to the present invention. 1A is a longitudinal sectional view of the grinding apparatus, FIG. 1B is a lateral end view taken along line BB in FIG. 1A, and FIG. 1C is FIG. 1A. It is an external view which shows the external appearance of the grinding spring body shown.

  The grinding apparatus 10 according to the present embodiment includes an elastic spring 12 wound in a coil shape, and a cutting edge 12b continuous along at least a part of the outer peripheral portion of the elastic spring 12 along the extending direction of the elastic spring 12. The grinding spring body 11 is formed. In the case of the illustrated example, the grinding spring body 11 is formed by spirally winding an elastic spring 12 having a circular cross-sectional basic shape. On the outer peripheral side of the elastic spring 12, a concave groove 12a having a concave cross section and continuing in the extending direction (spiral direction) of the elastic spring 12 is formed, and the outer peripheral portion (cross section) of the elastic spring 12 is formed by the concave groove 12a. The blade edge 12b is formed in an L shape. The cutting edge 12b is also formed continuously in at least a part of the extending direction of the elastic spring 12.

  A distal end (corresponding to the first end portion) 12c of the elastic spring 12 is attached to a distal end portion 15a of the first drive member 15 to be described later via an attachment portion (configured by a flange-like flange portion) 13. It is done. A base end (corresponding to the second end portion) 12d of the elastic spring 12 is a distal end portion of a second drive member 16 to be described later via an attachment portion (configured by a flange-like flange portion) 14. It is attached to 16a. In the illustrated example, the distal end 12c is fixed to the distal end portion 15a, and the proximal end 12d is fixed to the distal end portion 16a. The elastic spring 12 is configured so as to be shortened in the axial direction (hereinafter referred to as a shortened state) as shown in FIG. 3 without receiving an external force. However, the elastic spring 12 may be configured to be in an axially extended state (hereinafter simply referred to as an extended state) as shown in FIG. The intermediate state between the shortened state and the extended state (hereinafter simply referred to as the intermediate state) may be used.

  The first drive member 15 is configured in an axial shape extending in the axial direction (the vertical direction in the figure), and the second drive member 16 is configured in a cylindrical shape that accommodates the first drive member 15 and extends in the axial direction. , 16 are arranged parallel to the axial direction. In the illustrated example, the first drive member 15 is columnar and the second drive member 16 is cylindrical, but the present invention is not limited to this. The base end portion 15b of the first drive member 15 has a projecting portion 15b projecting in the radial direction, and the projecting portion 15b is a slit portion 16b formed to extend in the axial direction in the second drive member 16. It is in a state of projecting outward from. The first drive member 15 is guided to be slidable in the axial direction inside the second drive member 16. In the illustrated example, since the slit portion 16b that guides the overhang portion 15b is formed linearly, the first drive member 15 slides within the second drive member 16 without rotating. However, if the slit portion 16b is formed in a spiral shape, the first drive member 15 can be configured to move in the axial direction while rotating around the axis with respect to the second drive member 16.

  The second driving member 16 is inserted into the holding hole 17a of the frame 17 and is held at an arbitrary axial position by tightening with a set screw 18 or the like screwed into the screw hole 17b of the frame 17. It can be moved in the axial direction by loosening. The holding means for the frame 17 of the second driving member 16 is not limited to the screw hole 17b and the set screw 18, and any means can be used as long as the second driving member 16 can be moved in the axial direction and can be held at an arbitrary position. It may be configured.

  With the above configuration, the elastic spring 12 of the grinding spring body 11 can be expanded and contracted in the axial direction by relatively moving the first driving member 15 and the second driving member 16 in the axial direction. The outer diameter of the elastic spring 12 changes as the elastic spring 12 expands and contracts in the axial direction. That is, when the elastic spring 12 is extended in the axial direction, the outer diameter is reduced, and when the elastic spring 12 is shortened in the axial direction, the outer diameter is increased. In addition, since the change of the outer diameter accompanying the expansion / contraction of the elastic spring 12 is slight, when it is desired to increase the amount of change of the outer diameter, the distal end 12c and the base end 12d are simultaneously connected with the expansion / contraction of the elastic spring 12. What is necessary is just to rotate relatively. That is, the outer diameter is further reduced by extending the elastic spring 12 in the axial direction and simultaneously twisting both ends thereof in the spiral winding direction, and the elastic spring 12 is shortened in the axial direction and at the same time both ends thereof are set in the spiral winding direction. Twisting in the opposite direction increases the outer diameter. Such a configuration is configured such that the first driving member 15 and the second driving member 16 rotate simultaneously with sliding in the axial direction by a method such as forming the slit portion 16b spirally as described above. do it.

  Next, an example of a method for manufacturing a workpiece using the grinding apparatus 10 having the above configuration will be described with reference to FIGS. A hole 19a having a circular cross section is formed in the work piece 19, and an inner edge corner portion 19b of the opening on one side and an inner edge corner portion 19c of the opening on the other side are formed in the hole 19a. Generally, when the hole 19a is cut with a drill or the like, burrs may be formed at the inner edge corner portions 19b and 19c, and thus a step of removing the burrs is required. Even if no burr is formed, a process of chamfering the inner edge corner portions 19b and 19c may be required. The grinding apparatus 10 of this embodiment can be used suitably in the above cases.

  In the present embodiment, a manufacturing method including a step of processing the inner edge corner portion 19b formed on one side (the lower side in the drawing) of the hole 19a from the other side (the upper side in the drawing) will be described below. Such a process is, for example, when one side of the hole 19a of the work piece 19 is a bag-closed space, or when the one side is not a closed space but has an inaccessible shape, This is effective in the case where the grinding apparatus 10 cannot be arranged due to the presence of other members such as wall surfaces.

  First, the elastic spring 12 shortened in advance is expanded by moving the distal end portion 15a of the first drive member 15 into the hole 19a, or the frame 17 is moved. As shown in FIG. 2, the tip 12c of the elastic spring 12 is projected to one side of the hole 19a. At this time, it is preferable that the outer diameter of the grinding spring body 11 is made smaller than the inner diameter of the hole 19a so that the inner surface of the hole 19a is not damaged. Further, if necessary, the outer diameter of the elastic spring 12 may be further reduced by moving the first drive member 15 to one side with respect to the second drive member 16 to further expand the elastic spring 12. The first drive member 15 can be driven in the axial direction by engaging the overhanging portion 15 a with the first operation portion 21 and operating the first operation portion 21.

  Next, when the portion on the tip 12c side of the elastic spring 12 sufficiently protrudes to one side of the hole 19a, the second drive member 16 is moved by releasing the holding state by the holding means 17b and 18 as shown in FIG. The elastic spring 12 is shortened by allowing the second drive member 16 to move to one side, and at the same time, the outer diameter of the elastic spring 12 is increased to be larger than the inner diameter of the hole 19a. At this time, the positional relationship in the axial direction between the first drive member 15 and the second drive member 16 is adjusted, and the outer diameter of the elastic spring 12 is set to an optimum value with respect to the inner diameter of the hole 19a. For example, if the outer diameter of the elastic spring 12 becomes smaller due to wear or re-polishing of the cutting edge 112b, the elastic spring 12 is further shortened to adjust its outer diameter. The second drive member 16 can be driven in the axial direction by engaging the overhanging portion 16 c with the second operation portion 22 and operating the second operation portion 22. Here, it is preferable that the first drive member 15 is held and fixed by the first operation unit 21. However, when the tip 15a of the first drive member 15 is in contact with a part of the workpiece 19 on one side or another member, the first drive member 15 may be in a free state.

  Thereafter, as shown in FIG. 4, the first operating member 21 is disengaged by releasing the engagement of the first operating portion 21, and the second driving member 16 is moved to the other side to move the elastic spring 12. The portion on the base end 12d side is drawn into the hole 19a. As a result, the outer peripheral portion of the elastic spring 12 comes into contact with the inner edge corner portion 19b along the spiral shape, and the outer diameter of the elastic spring 12 moves while the contact position of the elastic spring 12 with respect to the inner edge corner portion 19b moves in the circumferential direction. The portion of the elastic spring 12 on the base end 12d side is gradually drawn into the hole 19a. At this time, the part (the part on the base end 12d side) disposed inside the hole 19a of the elastic spring 12 is stretched in the axial direction to reduce the diameter, but remains on one side of the hole 19a of the elastic spring 12. The portion (the portion on the tip 12c side) is caught by the inner edge corner portion 19b, so that the diameter-expanded state is maintained in the shortened state.

  In the above aspect, the case where the elastic spring 12 is maintained in the shortened state shown in FIG. 3 in a state where no external force is applied to the first drive member 15 and the second drive member 16 has been described. When the elastic spring 12 is maintained in the extended state or the intermediate state, the position of the first drive member 15 is controlled so that the portion disposed on one side of the hole 19a of the elastic member 12 is maintained in the shortened state. It is necessary to control by such as. For example, by moving the first driving member 15 to the other side little by little at a speed smaller than the moving speed of the second driving member 16, the outer diameter of the portion of the elastic spring 12 arranged on one side of the hole 19a is reduced. It can be maintained at a value larger than the inner diameter of the hole 19a.

  When the elastic spring 12 gradually moves into the hole 19a while maintaining its spiral shape as described above, the blade edge 12b formed on the outer peripheral portion of the elastic spring 12 grinds the inner edge corner portion 19b in a circular shape. Then, if there is a burr in the inner edge corner portion 19b, it can be surely removed. At this time, since the blade edge 12b is formed continuously in the extending direction even at least in a part of the extending direction of the elastic spring 12, the portion where the blade edge 12b grinds the inner edge corner portion 19b is in the circumferential direction. Since the cutting edge 12b is processed so as to obliquely cross the inner edge corner portion 19b while continuously moving, the inner edge corner portion 19b can be ground reliably and easily.

  At this time, the first drive member 15 of the grinding apparatus 10 is inserted into the substantially cylindrical second drive member 16 and is slidable while being guided in the axial direction by the second drive member 16. Thus, both the drive members can be configured in a compact manner, and can be operated in parallel with each other along the axial direction without using other members. Accordingly, since the elastic spring 12 can be accurately controlled without complicating the drive structure, the positional relationship between the inner diameter of the hole 19a and the outer peripheral portion of the elastic spring 12 can be set with high accuracy, and reliable and highly accurate. In addition, the inner edge corner portions 19b and 19c can be ground. Thus, the configuration is suitable for the above-described method of manufacturing a workpiece.

  FIG. 5 is a partial longitudinal sectional view and a partial outer view showing another configuration example of the grinding spring body 11. In this configuration example, the outer diameter of the small-diameter portion 12A that is the portion on the base end 12d side of the elastic spring 12 is formed smaller than the outer diameter of the large-diameter portion 12B that is the portion on the distal end 12c side. In the case of the illustrated example, the outer peripheral portion of the small-diameter portion 12A has been partially deleted (processed into a semicircular cross section), but this is not a limitation, and the winding diameter of the elastic spring 12 is reduced. Alternatively, the diameter of the elastic spring 12 itself may be reduced.

  When configured as described above, the small-diameter portion 12A on the base end 12d side of the elastic spring 12 does not easily come into contact with the inner surface of the hole 19a when the state shown in FIG. 2 shifts to the state shown in FIG. It can prevent giving. Further, even when the situation shown in FIG. 3 is shifted to the situation shown in FIG. 4, after the small diameter portion 12A of the elastic spring 12 is smoothly introduced into the hole 19a, the large diameter portion 12B of the elastic spring 12 becomes the inner edge corner portion. Since grinding is started in a state where the small diameter portion 12A is sufficiently stretched by being caught by 19b, there is an advantage that stable processing can be performed on the inner edge corner portion 19b.

  The elastic spring 12 is not divided into the small diameter portion 12A and the large diameter portion 12B, but is configured to have a shape in which the diameter gradually decreases from the distal end 12c toward the base end 12d, that is, the elastic spring 12 has an inversely tapered shape. It is also possible to configure. Even in this case, the same effect as described above can be obtained.

  FIG. 6 is a partial cross-sectional view and a partial external view showing still another configuration example of the grinding spring body 11. In the above embodiment, the cutting edge 12b on the outer peripheral portion of the elastic spring 12 is formed facing the other side (the upper side in the figure), and the elastic spring 12 is moved from one side (the lower side in the figure) to the inside of the hole 19a from the one side (the lower side in the figure). In this configuration example, the cutting edge 12b of the outer peripheral portion of the elastic spring 12 is formed facing one side (the lower side in the drawing) contrary to the above. In this configuration example, the grinding spring body 11 is arranged on the other side (the upper side in the figure) opposite to FIG. 3 with respect to the hole 19a, and the elastic spring 12 is shortened to increase the outer diameter. The member 15 is moved to one side to move the tip 12c of the elastic spring 12, and the inner edge corner portion 19c on the other side can be processed in a manner opposite to that shown in FIG.

  According to this embodiment described above, the cutting edge 12b is formed continuously in the extending direction of the elastic spring 12 in at least a part of the outer peripheral portion of the elastic spring 12, and the outer diameter of the elastic spring 12 is made larger than the inner diameter of the hole 19a. Since the one end side is drawn from the outside to the inside of the hole 19a, the cutting edge 19a moves sequentially into the hole 19a while cutting the inner edge corner portions 19b and 19c in a circular shape. The inner edge corner portions 19b and 19c can be ground reliably and easily, and if there are burrs, they can be reliably removed.

  In particular, in this embodiment, the grinding spring body 11 can be applied from the other side of the hole 19a to process the inner edge corner of the opening on one side of the hole 19a. When only access from the other side of 19a is permitted, a remarkable effect can be obtained when access from one side of hole 19a is not possible due to the presence of other obstacles.

  In addition, the manufacturing method and grinding apparatus of the workpiece of this invention are not limited only to the above-mentioned illustration example, Of course, it can add various changes within the range which does not deviate from the summary of this invention. For example, the coil shape of the elastic spring 12 is not limited to a cylindrical shape. For example, when the opening shape of the hole 19a is not circular, an elliptical cylindrical shape, a long cylindrical shape, a rounded rectangular cylindrical shape, etc., depending on the opening shape. Various shapes are possible. Further, in the above embodiment, the entire elastic spring 12 is shortened outside the hole 19a and is drawn into the hole 19a after having an outer diameter larger than the inner diameter of the hole 19a. In a state where a part of the first end side is shortened outside the hole 19a and has an outer diameter larger than the inner diameter of the hole 19a, the second end is moved through the hole 19a, and the elastic spring 12 is moved. You may make it retract.

The longitudinal cross-sectional view (a) which shows the whole structure of the grinding device of embodiment, a lateral end view (b), and the partial external view (c) of a grinding spring body. The longitudinal cross-sectional view which shows the 1st step (initial state) of the processing aspect of embodiment. The longitudinal cross-sectional view which shows the 2nd step (preparation state) of the process aspect of embodiment. The longitudinal cross-sectional view which shows the 3rd step (processing state) of the processing aspect of embodiment. The fragmentary sectional view and partial external view which show the modification of the grinding spring body of embodiment. The fragmentary sectional view and partial external view which show another modification of the grinding spring body of embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Grinding device, 11 ... Grinding spring body, 12 ... Elastic spring, 12a ... Concave groove, 12b ... Cutting edge, 12c ... Tip, 12d ... Base end, 13, 14 ... Mounting part, 15 ... First drive member, 15a ... Tip part, 15b ... Overhang part, 16 ... Second drive member, 16a ... Tip part, 16b ... Slot part, 16c ... Overhang part, 17 ... Frame, 18 ... Set screw, 19 ... Workpiece, 19a ... Hole, 19b, 19c ... Inner edge corner, 21 ... First operation part, 22 ... Second operation part

Claims (4)

Processing using a grinding spring body having an elastic spring wound in a coil shape and having a continuous cutting edge formed along at least a part of the outer peripheral portion of the elastic spring along the extending direction of the elastic spring A method for manufacturing a workpiece, comprising a step of grinding an inner edge corner of an opening on one side of a hole formed in a workpiece,
The grinding spring body is preliminarily disposed on the other side of the hole, the first end of the elastic spring is moved to the one side, the elastic spring is stretched in the axial direction, and the outer diameter is reduced to reduce the outer diameter. The first end is pulled out to one side of the hole;
Thereafter, the second end opposite to the first end is moved to the one side to shorten the elastic spring in the axial direction on one side of the hole, and at least the axial direction of the elastic spring is increased. Increasing the outer diameter of the portion on the one end side, and configuring the outer diameter to be larger than the inner diameter of the hole;
Thereafter, in the process of moving the elastic spring to the other side and pulling it into the hole from one side of the hole, the outer peripheral portion of the elastic spring is continuously brought into contact with the inner edge corner portion in the circumferential direction, A method of manufacturing a workpiece, wherein the inner edge corner portion is ground in a circular shape with a blade edge. Processing using a grinding spring body having an elastic spring wound in a coil shape and having a continuous cutting edge formed along at least a part of the outer peripheral portion of the elastic spring along the extending direction of the elastic spring A method for manufacturing a workpiece, comprising a step of grinding an inner edge corner of an opening on one side of a hole formed in a workpiece,
At least a portion of the elastic spring on the side of the first end in the axial direction is shortened in the axial direction to increase its outer diameter, and the outer diameter is configured to be larger than the inner diameter of the hole so as to be on one side of the hole. Place and
The second end portion opposite to the first end portion is moved to the other side through the hole, and the portion on the second end portion side of the elastic spring is stretched in the axial direction from one side of the hole. In the process of drawing into the hole, the outer peripheral portion of the elastic spring is continuously brought into contact with the inner edge corner portion in a circumferential direction, and the inner edge corner portion is ground in a circular shape with the blade edge. A method for manufacturing a workpiece. Before disposing at least one portion of the elastic spring on the first end side in the axial direction on one side of the hole,
The grinding spring body is preliminarily disposed on the other side of the hole, the first end is moved to the one side, the elastic spring is stretched in the axial direction, and the outer diameter is reduced, and the first end is passed through the hole. Part is pulled out to one side of the hole,
Then, the second end is moved to the one side to shorten the elastic spring in the axial direction on one side of the hole, and at least a portion of the elastic spring on the first end side in the axial direction. The method of manufacturing a workpiece according to claim 2, wherein the outer diameter is increased. A grinding spring body having an elastic spring wound in a coil shape, and a cutting edge continuous along the extending direction of the elastic spring formed on at least a part of the outer peripheral portion of the elastic spring, and the elastic spring A first drive member that passes through the inside of the elastic spring in the axial direction and protrudes from the second end of the elastic spring, and is attached to the second end of the elastic spring, A second drive member extending in parallel with the first drive member;
By changing the relative positional relationship between the first drive member and the second drive member in the axial direction, the elastic spring expands in the axial direction and its outer diameter decreases and shortens in the axial direction. Configured to increase its outer diameter,
The second driving member is formed in a substantially cylindrical shape, the first driving member is inserted inside the second driving member, and is slidably guided in the axial direction by the second driving member. Grinding equipment.

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