JP2007054904A - Lapping method and lapping tool for metal mold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lapping method, automatically lapping the inside of a machined recessed part of a cut metal mold, and a lapping tool for a metal mold, utilized for implementing the lapping method. <P>SOLUTION: A lapping agent 8 fills up in the machined recessed part 2 of the metal mold 1 set on a numerically controlled machine tool, and while the lapping tool 3 fitted to a spindle 4 of the numerically controlled machine tool is rotated on its axis in the lapping agent 8, the lapping tool is moved along the surface 2a to be lapped of the machined recessed part 2, thereby applying the lapping agent 8 to the surface 2a to be lapped using the lapping tool 3 to achieve lapping. As the tool utilized for implement the lapping method, the lapping tool is provided, which is so constructed that the peripheral surface of the tool body 6 is provided with a rugged part (a projection 7 or the like) for scattering the lapping agent 8 coming into contact with the peripheral surface in the centrifugal direction by its rotation. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lapping method in a machining recess of a machined mold and a lapping tool that can be used for carrying out the lapping method.

  The die cut by a numerically controlled machine tool is lapped (polished) on the inner surface of its processed recess as the final finishing process. However, the manual wrap processing method is only generally known.

  As a conventional hand wrap processing method, for example, a wrapping agent containing diamond abrasive grains or the like is injected toward the wrapping surface of the mold by centrifugal force with an injection device that is a hand-held tool, and the wrapping agent is applied to the wrapping surface. The method of polishing the surface to be lapped with friction heat generated by sliding at high speed is known, but it requires a long time and requires long processing time and high processing cost. .

  An object of the present invention is to provide a mold lapping method capable of solving the conventional problems as described above, and the features thereof are shown with reference numerals of embodiments to be described later. The lapping agent 8 is filled in the machining recess 2 of the mold 1 set in the numerically controlled machine tool, and the lapping tool 3 attached to the spindle 4 of the numerically controlled machine tool is rotated in the lapping agent 8 while rotating. By moving the processing recess 2 along the lapping target surface 2a, the lapping tool 3 acts on the lapping target surface 2a with the lapping tool 3 to perform lapping.

  In carrying out the present invention having the above-described configuration, specifically, as described in claim 2, a surrounding member 5 surrounding the processing recess 2 of the die 1 is attached to the upper side of the die 1, and the surrounding member 5 is attached. And the processing recess 2 of the mold 1 can form a wrapping agent filling container, and the wrapping agent 8 can be filled therein. Furthermore, as described in claim 3, the core 21 can be disposed in the processing recess 2 of the mold 1 to reduce the filling volume of the wrapping agent 8 in the processing recess 2.

  The present invention also provides a lapping tool that can be utilized when performing the above-described die lapping method, that is, a lapping agent in contact with the circumferential surface of the tool body 6 as described in claim 4. Provided is a shot peening type lapping tool on which concave and convex processing (such as ridges 7) for scattering 8 in the centrifugal direction by rotation of the tool body 6 is performed. When implementing this shot peening type lapping tool, as described in claim 5, the tip of the tool body 6 is chamfered into a tapered shape (such as a hemispherical surface), and the region up to the tip 6a is Concave and convex processing (projecting ridges 7 and the like) can be applied, and as described in claim 6, the concave and convex processing can be performed by radially injecting the wrapping agent 8 that has entered into the concave and convex processing by centrifugal force. It is assumed that the tool body 10 is formed at appropriate intervals in the direction, and the wrapping agent introduction hole 15 is provided in the inside of the tool body 10 along the axial direction, and one end of the wrapping agent introduction hole 15 is formed at the tip of the tool body 10. While being opened, the other end can be opened in each of the concave grooves 11 through the lateral hole 16.

  Furthermore, in place of the above-described shot peening type lapping tool, as described in claim 7, the buff 20 for sliding the surrounding lapping agent 8 on the lapping target surface 2 a on the mold 1 side is provided. Ablation type lapping tools are also provided.

  Further, according to the present invention, as described in claim 8, the tool body 23 is connected to the pump chamber 24 from the one end side of the pump chamber 24, and the lapping agent discharge passage 26 opened from the end of the tool body 23. And a lapping agent inlet 25 that is connected to the other end of the pump chamber 24 and opens on the peripheral surface of the tool body 23, and rotates integrally with the tool body 23 in the pump chamber 24. Thus, there is provided a lapping tool of a type capable of injecting the lapping agent from the tip of the tool body, provided with a vane (axial pump vane) 27 for sending the lapping agent in the pump chamber 24 to the lapping agent discharge passage 26.

  The lapping method according to the first aspect of the present invention is a numerically controlled machine tool by a numerical control program set in advance based on the three-dimensional data of the lapping surface of the machining recess of the mold, that is, the inner surface. By moving the main spindle of the mold and rotating the lapping tool attached to the main spindle while maintaining a fixed relative positional relationship with respect to the surface to be lapped of the machining recess of the mold. The lapping agent filled in the mold recess is struck or slid into contact with the lapping surface of the mold with the lapping tool. The mold lapping process can be carried out very efficiently. Moreover, the lapping agent is directly filled into the processing recess of the mold, the surface to be lapped, which is the inner surface of the processing recess, is immersed in the lapping agent, and the lapping tool is rotated in this lapping agent. Because it is moved, the continuous supply of lapping agent to the lapping tool / lapping surface is also performed without equipment and energy, greatly reducing the equipment cost and running cost, making it extremely inexpensive High-quality lapping can be performed.

  In addition, according to the structure of Claim 2, since it can be set in the wrap agent surely to a level higher than the upper end (upper end of the process recessed part of a metal mold | die) of a to-be-processed surface, It is possible to reliably perform the lapping process up to the upper end of the lapping surface without replenishment. In addition, scattering of the wrapping agent can be suppressed by the surrounding member. Furthermore, for a large mold having a large volume of processing recesses in the mold, the amount of expensive lapping agent used can be reduced and the processing cost can be reduced by adopting the method according to claim 3. Can do.

  When implementing the lapping method of the present invention according to claims 1 to 3 described above, the lapping tool according to claims 4 to 8 can be utilized. When using the lapping tool according to claim 4, since the lapping agent in contact with the peripheral surface can be scattered in the centrifugal direction by uneven processing of the peripheral surface of the rotating tool body, the peripheral surface of the tool Is used for the lap process according to the method of the present invention as a shot peening type lap tool by controlling the lap process so as to move with a certain small gap with respect to the lap process surface on the mold side. And continuously.

  Furthermore, when the lapping tool according to claim 5 is adopted, the lapping agent is scattered in the centrifugal direction around the tip of the tool by the uneven processing of the hemispherical tip of the tool, and the tip of the tool The lapping process can be performed also on the lapping process surface on the mold side facing the part, which is useful for reducing the number of blind spots where the lapping process cannot be performed.

  Moreover, according to the structure of Claim 6, only by rotating a tool in a lapping agent, a lapping agent is strongly injected with a centrifugal force from the inside of a ditch | groove, and it strikes against the to-be-processed surface of a metal mold | die. It is possible to perform a powerful lapping process, but since the lapping agent is automatically sucked and replenished from the opening of the tool tip into the concave groove that has become negative pressure due to injection of the lapping agent by centrifugal force, It is not necessary to use a special lapping agent replenishment means for this tool.

  When the lapping tool according to claim 7 is employed, the buff peripheral portion of the tool is in sliding contact with the lapped surface on the mold side at a constant pressure along the lapped surface. By controlling the tool to move while rotating, the lapping process can be automatically and continuously performed as an ablation type lapping tool.

  Furthermore, when the lapping tool according to claim 8 is adopted, since the lapping agent can be injected from the tip of the tool body, a type in which the lapping agent is scattered or injected mainly from the peripheral surface of the tool body. In this lapping tool, it is difficult to make the peripheral surface of the tool body face, but it is easy to make the tip of the tool body face, and the lapping process on the lapping surface of the mold can be performed reliably. In addition, there is no need to separately prepare a means for feeding the lapping agent from the outside to the tool body, and the lapping agent inlet opening in the peripheral surface of the tool body that is simply rotationally driven is in the lapping agent in the mold. The method of the present invention can be carried out at low cost only by maintaining the state immersed in the substrate. The configuration described in claim 8 is more effective when implemented in combination with the configuration described in claims 4-7.

  A specific embodiment of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, 1 is set in a numerically controlled machine tool immediately after the machining recess 2 is cut in the numerically controlled machine tool. A die 3 is a shot peening type lapping tool attached to the spindle 4 of the numerically controlled machine tool in place of the cutting tool used for cutting the machining recess 2. Reference numeral 5 denotes a surrounding member installed on the upper surface of the mold 1 so as to surround the periphery of the upper end of the processing concave portion 2, and the surrounding member 5 and the processing concave portion 2 form a wrapping agent filling container. In other words, the inner space of the processing recess 2 is raised by the surrounding member 5.

  As shown in FIG. 2, the shot peening type lap tool 3 includes a tip end portion 6a of a cylindrical tool body 6 having a substantially hemispherical tip portion 6a, and a lap action region 6b having an appropriate length on the tip end side. Concave and convex processing is given to the peripheral surface of the. In the illustrated example, the concavo-convex process on the peripheral surface of the lapping region 6b is made by projecting protrusions 7 along the axial direction of the tool body 6 at appropriate intervals in the circumferential direction. Each protrusion 7 in the illustrated example extends to the region of the tip 6a so as to reach the tip of the hemispherical tip 6a in a state where the height is gradually reduced or at the same height. Has been. Although not shown, the surface of the lapping tool 3 (including the outer surface of the ridge 7) is made of rubber or the like for suppressing the surface of the lapping tool 3 from being worn by sliding contact with the lapping agent. A protective coating is applied.

  Prior to lapping the inner surface of the processing recess 2 of the mold 1, that is, the lapping surface 2 a, the wrapping agent 8 is filled into the wrapping agent filling container formed by the surrounding member 5 and the processing recess 2. . The lapping agent 8 is a liquid phase product (diamond paste or the like) containing diamond abrasive grains. The filling amount of the wrapping agent 8 must be an amount that can completely cover the upper end of the processing recess 2 of the mold 1.

  Thus, when the attachment of the lapping tool 3 to the main shaft 4 and the filling of the lapping agent 8 are completed, the main shaft 4 is rotationally driven to rotate the lapping tool 3 in a predetermined direction at a predetermined speed. The lapping region 6b of the tool 3 maintains a certain small gap with respect to the lapping surface 2a of the mold 1 (about 0.1 to 3 mm in the case of the shot peening lapping tool 3 having the above configuration). Position control with respect to the main shaft 4 is performed so as to move along the surface 2a. At this time, at least the lapping area 6b of the tool 3 and the lapping surface 2a of the mold 1 are immersed in the lapping agent 8, so that the lapping agent 8 in contact with the lapping area 6b of the tool 3 is in contact with the tool 3. A rotational force is received by the frictional resistance between the protrusions 7 due to rotation, and centrifugal force is applied to the lapping agent 8 in contact with the lapping region 6b due to this rotation, so that the wrapping surface of the mold 1 is to be lapped. The lapping target surface 2a is lapped by being struck by 2a. In addition, since the uneven | corrugated process which forms the protrusion 7 is also given to the hemispherical front-end | tip part 6a of the tool 3, the lapping agent 8 which contact | connects the hemispherical front-end | tip part 6a of this tool 3 is also the said hemispherical front-end | tip. The to-be-wrapped processing surface 2a on the mold 1 side, which is scattered in the centrifugal direction from the portion 6a and faces the hemispherical tip portion 6a, is also subjected to the lapping action.

  A numerical control program for controlling the position of the main shaft 4 (a cutting tool attached to the main shaft 4) is set in the numerical control machine tool for cutting the processing recess 2 of the mold 1. Therefore, with respect to the data of this numerical control program (three-dimensional position data of the inner surface of the machining recess 2), the above-mentioned lapping tool 3 and the inner surface of the machining recess 2 of the mold 1 (the surface to be lapped 2a) By automatically generating a numerical control program for the main spindle 4 for lap processing taking into account the value of a constant small gap to be secured as an offset value, and performing position control of the main spindle 4 according to the numerical control program for lap processing, Using the lapping tool 3 described above, the entire lapping surface 2a of the mold 1 can be automatically lapped.

  Hereinafter, a modification of the lapping tool will be described. A shot peening type lapping tool 9 shown in FIG. 3 has a tip including a tip 10a of a cylindrical tool body 10 having a substantially hemispherical tip 10a. On the peripheral surface of the lap action region 10b having an appropriate length on the side, concave grooves 11 having an appropriate depth are engraved at appropriate intervals in the circumferential direction as uneven processing. Each concave groove 11 has a depth that increases toward the tip end portion 10a, and in the cross-sectional shape, the rear end side is provided so as to be inclined in a direction that advances in the rotation direction of the tool 9 (tool body 10). Each concave groove 11 is formed so that the depth is the shallowest or zero at the tip of the hemispherical tip 10a.

  According to the lapping tool 9 described above, the lapping agent that has entered each groove 11 receives centrifugal force while being pushed outward by the rotation of the tool 9 (tool body 10), and is strongly radiated from each groove 11. Is injected into. Therefore, the effect of smashing the lapping agent against the surface to be lapped of the mold is great, and a powerful lapping process is possible. When the wrapping agent is injected from each concave groove 11 by centrifugal force, the concave groove 11 becomes negative pressure. Therefore, each concave groove 11 located at the hemispherical tip portion 10a having a low rotational peripheral speed is provided. Since the lapping agent that has entered from one end flows toward the other end in the groove 11 and the lapping agent is constantly replenished in the groove 11, the lapping action by the tool 9 is This is continuously performed as long as the entire lapping region 10b of the tool 9 is rotationally driven in a state where it is immersed in a lapping agent filled in a processing recess in the mold.

One example using the above-described shot peening type lapping tool 9 is shown in which lapping is performed on a machining recess of a 6 mm × 6 mm × 4 mm cemented carbide die for pressing a hinge part of a mobile phone. If, took 18 hours for hand wrap work, moreover surfaces whom those working accuracy reduction, such as has occurred, using the lap tool 9 having an outer diameter of 4mm lap action area 10b, spindle speed 4000 min ^{- 1. When} lapping was performed using lapping agent = diamond paste used, the machining accuracy was 0.5 μm, which was the machine tool repeatability, with a machining time of 1 hour and 26 minutes.

  The shot peening type lapping tool 12 shown in FIG. 4 has a peripheral surface of a lapping action region 13b having an appropriate length on the distal end side including the distal end portion 13a of a cylindrical tool body 13 having a substantially hemispherical distal end portion 13a. As an uneven process, concave grooves 14 having an appropriate depth are formed at appropriate intervals in the circumferential direction. Each of the concave grooves 14 is provided so that the rear end side in the cross-sectional shape is inclined in the direction of proceeding in the rotation direction of the tool 12 (tool body 13). The tool body 13 is provided with a wrapping agent introduction hole 15 having one end opened at the tip of the hemispherical tip portion 13a along the axial direction. In the illustrated example, the number of the holes 16 is one, but two or more may be provided).

  According to the lapping tool 12 described above, the lapping agent that has entered each groove 14 receives centrifugal force while being pushed outward by the rotation of the tool 12 (tool body 13), and is strongly strengthened radially from each groove 14. Is injected into. Accordingly, the effect of the wrapping agent striking against the surface to be wrapped of the mold is large, and a powerful lapping process is possible. However, each concave groove 14 has a tool body through the lateral hole 16 and the wrapping agent introduction hole 15. 13 is connected to the tip of the hemispherical tip portion 13a, and a large centrifugal force does not act on the lapping agent in the lapping agent introduction hole 15, so that the lapping agent is injected from each concave groove 14 by the centrifugal force. As the inside of the concave groove 14 becomes negative pressure, the wrapping agent is reliably and continuously supplied into each concave groove 14 through the wrapping agent introduction hole 15 and the lateral hole 16. Therefore, the lapping action by the tool 12 is continuous as long as the entire lapping action region 13b of the tool 12 is rotationally driven in a state where it is immersed in the lapping agent filled in the machining recess in the mold. Done.

  The lapping tool 17 shown in FIG. 5 is an abrasion type lapping tool that directly slidably contacts the lapping surface of the mold and lapping with a lapping agent interposed between the lapping surface. In this lapping tool 17, a large number of buffs 19 in which a cloth-like buff material is folded in two are radially planted in the tip small-diameter shaft portion 18 a of the tool body 18 in a state parallel to the axial direction of the tip small-diameter shaft portion 18 a. A buff 20 is provided. Although not shown in detail, as a method of implanting the buff single body 19 in the tip small diameter shaft portion 18a, radial cuts along the axial direction are radially engraved in the tip small diameter shaft portion 18a. For example, a method of inserting the base portion of the buff unit 19 into the notch and fixing it by an appropriate method such as adhesion can be employed. In this case, as shown in the figure, the end of each buff unit 19 is extended from the tip of the tip small-diameter shaft portion 18a, and the tip of the tip small-diameter shaft portion 18a is surrounded by the end of each buff unit 19. can do. Alternatively, a buff constituted by a method in which a large number of disc-shaped buffs are fitted and fixed to the small diameter shaft portion 18a at the tip end in the axial direction may be used.

  In the case of the abrasion type lapping tool 17 as described above, the position of the tool 17 is controlled so that the peripheral portion of the rotating buff 20 bends and directly comes into sliding contact with the surface to be lapped of the mold. The lapping action can be performed with a lapping agent interposed between the periphery of the lapping plate and the surface to be lapped.

  In the case of a large mold in which the volume of the machining recess is increased, the amount of wrapping agent filled in the machining recess is also increased. In such a case, in order to reduce the usage cost of the expensive lapping agent and reduce the running cost, as shown in FIG. 6, the space in the processing recess 2 is loosely fitted in the processing recess 2 of the mold 1. A core 21 for reducing the volume can be used in combination. The core 21 has a lapping tool 3 for lapping on the entire lapping surface 2a that is the inner surface of the processing recess 2 (of course, all lapping tools 9, 12, 17), and can be supported by the surrounding member 5 via a stay. When such a core 21 is used in combination, the spindle 4 of the numerically controlled machine tool that holds and rotates the lapping tool 3 or the like moves only in the horizontal two-dimensional X, Y axis direction and the vertical Z axis direction. If possible, the lapping process cannot be performed on the lapping surface 2a immediately below the core 21, so that the axis of the spindle 4 such as the spindle 4 is provided in the final stage robot arm of the articulated robot. It is necessary to use a numerically controlled machine tool of a type that can freely change its orientation.

  In any of the above shot peening type lapping tool and ablation type lapping tool, an effective rotational peripheral speed cannot be obtained in the vicinity of the tool tip. It is difficult to perform a reliable and sufficient lapping treatment on the surface. Accordingly, the peripheral surface of the tool is made to face a horizontal or inclined surface to be wrapped using a numerically controlled machine tool of a type that can freely change the direction of the axis of the main shaft 4 as described above. Although it is necessary to control the attitude of the tool, it is conceivable that it is difficult to completely satisfy the demand due to the cross-sectional shape and size of the machining recess of the mold. In such a case, for example, a lapping tool 22 as shown in FIG. 7 can be used. The lapping tool 22 has a pump chamber 24 having a tapered lower half in the middle of the axial direction of a cylindrical tool body 23 that is driven to rotate around an axis. A lap agent inlet 25 is provided at a plurality of locations in the circumferential direction of the upper peripheral wall, and a lap agent discharge passage 26 that opens from the lower end of the pump chamber 24 to the tip of the hemispherical tip 23a of the tool body 23 is provided concentrically. In addition, an axial pump blade 27 that generates thrust toward the lap agent discharge passage 26 by the rotation of the tool body 23 is provided in the tapered lower half of the pump chamber 24. The tool body 23 is composed of a lower half portion 28 that forms a pump chamber 24 that is open on the upper side, and an upper half portion 29 that closes the upper end of the pump chamber 24. A cylindrical portion 28 a provided with the inlet 25 is fitted and fixed to the lower end of the upper half portion 29 so that the lower half portion 28 and the upper half portion 29 are integrated.

  According to the lapping tool 22 having the above-described configuration, when the lower half 28 including at least the lapping agent inlet 25 of the tool 22 is immersed in the lapping agent, the tool 22 is rotated around the axis of the tool body 23. The lapping agent that has entered the pump chamber 24 receives a thrust toward the lapping agent discharge passage 26 by the axial flow pump blade 27 that rotates integrally with the tool main body 23, and the tool main body is opened from the front end of the lapping agent discharge passage 26. 23 are injected in the axial direction. The discharge of the wrapping agent from the pump chamber 24 causes the inside of the pump chamber 24 to have a negative pressure, so that the wrapping agent in contact with the outside of the tool body 23 is sucked into the pump chamber 24 from the wrapping agent inlet 25. Therefore, the lapping agent injection action by the axial flow pump blades 27 is continuously performed. Accordingly, by moving the tip of the hemispherical tip portion 23a of the tool body 23 in a state of facing the lap target processing surface which is the inner surface of the machining recess of the mold, the lap target processing surface is continuously wrapped. Can be processed.

  In addition, the structure employ | adopted as said lap tool 22 is the structure which employ | adopted the lapping tool 3, 9, 12, 17 etc. which were demonstrated previously rather than using alone, and which performs a lap effect | action around the rotating shaft center It is preferable to use in combination. Moreover, although explanation was abbreviate | omitted in the lap tools 9, 12, 17, and 22, as demonstrated in the lap tool 3 shown in FIG. 3, it immerses in at least the lap | wrap agent of each lap tool 9,12,17,22. A protective coating such as rubber is applied to the entire surface of the region to be applied to prevent the surface of the lapping tool from being worn by sliding contact with the lapping agent.

It is a partially longitudinal side view explaining the method of the present invention. Fig. A is a partially cutaway side view showing an example of a shot peening type lapping tool, and Fig. B is a cross-sectional view of the main part of the tool. Fig. A is a cross-sectional view of the main part showing another example of a shot peening type lapping tool, and Fig. B is a vertical side view of the main part of the tool. Fig. A is a cross-sectional view of a main part showing still another example of a shot peening type lapping tool, and Fig. B is a vertical side view of the main part of the tool. Fig. A is a partially cutaway side view showing an example of an abrasion type lapping tool, and Fig. B is an enlarged schematic cross-sectional view of the main part of the tool. It is a partially longitudinal side view explaining the other example of this invention method. Fig. A is a longitudinal side view of a main part showing an example of a lapping tool having a pump function, and Fig. B is a transverse plan view of the main part of the tool.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Metal mold | die 2 Process recessed part 3, 9, 12, 17, 22 Lapping tool 4 Spindle 5 of a numerical control machine tool Enclosure member 6, 10, 13, 18, 23 Tool main body 6a, 10a, 13a, 23a Hemisphere Plane tip portions 6b, 10b, 13b Lapping action region 7 Projection (unevenness processing)
8 Lapping agent 11, 14 Concave groove
15 Lapping agent introduction hole 16 Horizontal hole 19 Buff simple substance 20 Buff 21 Core 24 Pump chamber 25 Lapping agent inlet 26 Lapping agent discharge passage 27 Axial flow pump blade

Claims (8)

  A lapping agent is filled in a machining recess of a mold set in a numerically controlled machine tool, and a lapping target surface of the machining recess is rotated while a lapping tool attached to the spindle of the numerically controlled machine tool is rotated in the lapping agent. A lapping process method for a mold, wherein the lapping process is performed by causing the lapping tool to act on the lapping target surface with the lapping tool.   The enclosing member surrounding the processing recess of the mold is attached to the upper side of the mold, and the wrapping agent filling container is formed by the enclosing member and the processing recess of the mold. Mold wrap processing method.   The method for wrapping a mold according to claim 1 or 2, wherein a core is disposed in the processing recess of the mold to reduce a filling volume of the wrapping agent in the processing recess.   It is a lapping tool used for the lapping process method of the metal mold | die of any one of Claims 1-3, Comprising: The lapping agent which contact | connects this peripheral surface is made to the surrounding surface of a tool main body by rotation of the said tool main body. A lapping tool that has been subjected to uneven processing for scattering in the centrifugal direction.   The lapping tool according to claim 4, wherein a tip end portion of the tool body is chamfered in a substantially hemispherical shape, and the unevenness processing is also applied to the hemispherical tip portion.   The concavo-convex processing is to form concave grooves that can radiate the lapping agent that has entered in radial direction by centrifugal force at appropriate intervals in the circumferential direction, and the lapping agent is formed in the tool body along the axial direction. The introduction hole is provided, and one end of the lapping agent introduction hole is opened at the tip of the tool body, and the other end is opened in each concave groove through a lateral hole. Lapping tool.   A lapping tool for use in the mold lapping method according to any one of claims 1 to 3, comprising a buff for sliding the surrounding lapping agent on the lapping surface on the mold side. A wrapping tool. A lapping tool for use in the mold lapping method according to any one of claims 1 to 3, wherein the tool body is connected to the pump body from one end side of the pump chamber. A lapping agent discharge passage that opens to the tip of the pump chamber, and a lapping agent inlet that is connected to the other end of the pump chamber and opens to the peripheral surface of the tool body, and is provided integrally with the tool body in the pump chamber. A lapping tool provided with blades for rotating the lapping agent in the pump chamber to the lapping agent discharge passage by rotating.

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