JPH0115500Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a polishing tool used for polishing, for example, a mold for injection molding.

[Technical background of the invention and its problems]

In general, molds for injection molding are mainly manufactured by cutting. In this case, the desired precision of the mold is obtained by finishing the inner surface of the mold by polishing after cutting. This polishing work is mostly done manually because mold manufacturing generally relies on high-mix, low-volume production. Therefore, mold polishing work has become extremely inefficient. Therefore, in recent years, polishing operations for molds have been carried out more efficiently using dedicated polishing equipment, in part for the purpose of speeding up mold manufacturing and increasing productivity.

Incidentally, in this dedicated polishing apparatus, a polishing lap A as shown in FIG. 3 is used as a processing tool. This lap A has a rectangular cross section and is held by a holding jig C supported by a grip part B of the polishing device. This holding jig C includes a cylindrical holding body E that surrounds the upper end of the wrap A via a tightening plate D made of an elastic member.
and a screw F which is screwed into the holder E and whose tip abuts against the clamping plate D to fix the wrap A. When the groove H of the workpiece W is polished using such a lap A, if the length L of the lap A is long, the imaginary line in Figure 3 may be caused by the elasticity of the lap A itself or the loosening of the screws F. It becomes deformed as shown in , and the corners cannot be polished sufficiently. Furthermore, even if the length L of the lap A is short, as shown in FIG. 4, the lap A is elastically deformed using the inner upper end of the workpiece W as a fulcrum, so that polishing cannot be performed reliably. Furthermore, since the pair of inner surfaces of the groove H are polished alternately on each side, it is extremely inefficient.

Therefore, in order to eliminate such problems, both sides of the groove H are simultaneously polished using a lap A whose width is several hundred μm smaller than the width of the groove H which requires lapping. However, according to this method, the lap A must be machined every time the width of the groove H changes, which increases the machining time and increases the machining cost.

[Purpose of invention]

The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a polishing tool that can completely and evenly polish the corners of the inner wall of the groove while preventing the grindstone from deforming.

[Summary of the invention] A pair of lap bodies are connected via a connecting body so that they can move toward and away from each other, and the distance between the pair of lap working surfaces can be adjusted in accordance with the width of the groove to be polished.

[Example of idea]

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

1 and 2 show the polishing tool of this embodiment. This polishing tool consists of a plate-shaped first wrap body 1 made of, for example, cast iron and having a rectangular main surface, and a prismatic-shaped wrap body which is protruded from the upper end surface of the first wrap body and is gripped by a chuck (not shown). a second wrap body 3 made of plate-like cast iron and having the same main surface shape as the first wrap body 1, which is provided so as to be movable toward and away from the main surface of the first wrap body 1; , a plurality of mutually parallel connecting screws 4 that connect the first and second wrap bodies 1 and 3 so as to be able to move toward and away from each other, and one end of these connecting screws 4 that can be rotated around an axis. It consists of locking plates 5 that lock onto the second wrap body 3, and fixing screws 6 that secure these lock plates 5 to the second wrap body 3. The other ends of the connecting screws 4 are screwed into the first wrap body 1. Therefore, the first wrap body 1 has these connecting screws 4...
Screw holes 7 are bored through the first wrap body 1 into which they are screwed. The axial direction of these screw holes 7 is set to be parallel to the directions of arrows 8a and 8b, which are the directions in which the first wrap body 1 and the second wrap body 3 approach and separate. Further, a collar 9 is formed on the other end of the connecting screw 4, and is loosely fitted into a recess 10 formed in the second wrap body 3 so as to be freely rotatable. Thus, the other end of the connecting screw 4 is locked to the second wrap body 3 by the collar 9 and the locking plate 5. Further, the locking plates 5 are fitted and fixed to the second wrap body 3 so that one main surface thereof is flush with the main surface of the second wrap body 3. Also,
A minus groove (not shown) for rotating the connecting screws 4 with a screwdriver and moving them forward and backward in the directions of arrows 8a and 8b is cut in the end of the screw hole 7 of the connecting screw 4. Furthermore, the first and second wrap bodies 1,
3 is set so that when the connecting screws 4 are rotated to bring them into close contact with each other, the four side surfaces are flush with each other.

Next, how to use the polishing tool configured as described above will be described.

As shown in FIG. 1, when polishing the inner wall surface of the groove 11 having a width M, the connecting screws 4 are rotated, and the first
and the wrap action surface 12 of the second wrap body 1, 3,
The distance between the first wrap body 3 and the second wrap body 3 is such that the distance K between the grooves 13 is several hundred μm smaller than the width M of the groove 11.
The wrap body 1 is moved forward and backward in the directions of arrows 8a and 8b. After the mounting portion 2 is gripped by the chuck, the table holding the workpiece 14 is moved, and the first and second wrap bodies 1 and 3 are fitted into the groove 11, causing the wrap to work. The surfaces 14 and 15 are positioned so as to contact the inner bottom surface 16 of the groove 11. Then, while supplying the lapping agent to the grooves 11, the polishing tool is vibrated while being pressed through the chuck, thereby polishing the grooves 11.

In this way, the polishing tool of this embodiment can adjust the distance between the lap working surfaces 12 and 13 in accordance with the groove width, so that even when polishing pressure is applied, the distance between the first and second lap bodies 1 and 3 can be adjusted. is not deformed. Therefore, the corners and inner wall surfaces of the groove can be polished with high precision and high efficiency. Further, since the labor of machining the lap according to the groove width is eliminated, the machining cost is reduced.

In the above embodiment, the connecting screws 4 are rotated from the first wrap body 1 side, but a through hole coaxial with the connecting screws 4 is bored in the second wrap body 3. The connecting screws 4 may be rotated from the side of the wrap body 3 of the two. Furthermore, the shape of the attachment portion 2 may be cylindrical. Furthermore, one end of the connecting screws 4 may be engaged with the first wrap body 1 via a collar, and the other end may be screwed into the second wrap body 3. Furthermore, the number and size of the connecting screws may be arbitrarily set as necessary.

[Effect of idea]

Since the polishing tool of the present invention can adjust the distance between the opposing lap working surfaces, the lap body will not be deformed by the polishing pressure when polishing the inner surface of the groove. Therefore, the groove can be polished with high precision and high efficiency. Furthermore, since the effort of machining the lap according to the groove width is eliminated, the machining cost is significantly reduced.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of a polishing tool according to an embodiment of the present invention, FIG. 2 is a plan view of the same, and FIGS. 3 and 4 are explanatory diagrams of defects in conventional polishing tools. 1...First wrap body, 3...Second wrap body, 4...Connection screw.

Claims (1)

[Scope of utility model registration request] It is equipped with a pair of lap bodies for polishing, and a connector for connecting these lap bodies so as to be able to move toward and away from each other, and the lap body has a pair of lap working surfaces that are perpendicular to the direction of approach and separation and are separated from each other. A polishing tool characterized in that the distance between the pair of lapping surfaces is adjustable by the connecting tool.