JPS58192725A - Jig for repairing mold and method of the same - Google Patents

Abstract

PURPOSE:To make possible highly accurate repairing, by using a mold repairing jig for repairing the enlarged hole of a punch holder of a mold for punching so that the adjacent section of the hole is deformed plastically to be repaired by a circular edge larger than the hole to be repaired. CONSTITUTION:The circular edge 4 of an edged device 1 is larger by about 0.2- 2mm. larger than the diameter of the hole to be repaired. The angle of the outer edge of the tip thereof lies in the range of 40-60 deg. and the angle of the inner edge lies in the range of 30-70 deg.. A central steel rod member 2 is detachably secured in the center of the edged device 1. The central steel rod member 2 is inserted into the hole to be repaired, and the head of the round bar 3 is driven by a hammer to raise the mold material adjacent the hole to be repaired so that the enlarged hole may be repaired.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a repair jig for a die for punching and processing, and more specifically, the present invention relates to a tool for punching and punching holes in plate materials such as metal plates, resin plates, fiber-reinforced resin plates, etc. This is a mold repair jig used for repairing hole enlargement (so-called ``galing'') that occurs on the surface of the punching holder and die hole facing the plate material of the mold, and the jig is A blade fitting (1) having a circular blade that is 1 to 1 fold larger than 0°, and a central steel bar (2) suitable for insertion into a repair hole of a mold are detachably attached to the center of the blade fitting. A mold repair jig characterized in that it consists of a rod (3), and a central steel bar (2) of the mold repair jig (c) is inserted into the hole of the mold to be repaired. After installing the vertical holder ■ that holds the mold repair jig perpendicular to the mold surface, drive in the top of the bar (4) of the mold repair jig, and then This is a mold repair method in which the area around the repair hole is polished after removing the vertical holder (■) from the mold repair jig.The hole position to be repaired can be accurately determined, and the position of the hole to be drilled can be adjusted from the hole. As an equal interval, it is possible to make the holes uniform perpendicular to the mold surface, and it is possible to finish holes with high precision.

For punching holes in plate materials such as metal plates, resin plates, fiber-reinforced resin plates, etc., holes in molds such as punching holders (punching strippers or shedders) and dies are used to punch out holes on the plate material side of the holes during the punching process. A so-called "one-gauge" phenomenon occurs in which the side that touches the surface expands.

This so-called "galling" occurs during punching due to the usually non-uniform distribution of the desired hole positions and when the punching pin is pulled out of the punched product, especially in the latter case due to an imbalance in the force of the punching operation between the dies. This is thought to be caused by the collapse of the parallelism of the holes, the adhesion of punching debris into the holes, and the misalignment of hole positions between the molds.

When this galling occurs, the shape of the hole in the processed product may become defective, the hole may become clogged with punching chips, and the processing condition deteriorates.

Therefore, whenever galling occurs, it is necessary to repair the mold.

The method for repairing such galling was to use a jig with a sharp tip, such as a round chisel, to visually drive holes vertically at equal intervals around the hole, and then finish by polishing.

However, with the above-mentioned method, it is difficult to improve the finishing accuracy of the hole because of unevenness in the driving position and force.

The present invention was completed as a result of research on a repair method that does not have the above-mentioned drawbacks. , r Below, the present invention will be explained based on the accompanying drawings.

Fig. 1 shows a bottom view G31) and a cross-sectional view of the mold repair jig (■) of the present invention, and Fig. 2 shows a state in which the jig shown in Fig. 1 is attached to the mold 0 using a vertical holder (■). This shows that.

In Fig. 1, a central steel bar 2 of a size suitable for insertion into a mold repair hole is inserted into the center of a bladed metal fitting 1 made of steel or the like having a circular blade 4. This figure shows a mold repair jig A that is detachably attached to a bar material 3 such as the above with screws 5.

Here, the circular blade 4 of the blade and tool 1 is determined from the diameter of the repair hole.
It is usually large in diameter from 0.2 to 211 II, and
The angle of the blade edge is usually 40 to 60° for the outer blade and 30° for the inner blade.
A range of ~70° is preferred.

Further, the central steel bar 2 is preferably larger if it can be freely inserted into and taken out of the repair hole.

FIG. 2 shows a state in which the mold repair jig A of FIG. 1 is inserted into the repaired hole 6 of the mold C and is held with a normal three-sided ruler-like vertical holder Bi trowel. In this state, the top of the mold repair jig A is driven in with a hammer to raise the mold material around the hole to be repaired. In the case of the first method, since the distance between the hole position and the driving position and the driving force can be made uniform, highly accurate repair with substantially no deviation in the hole position after finishing can be performed.

In addition, in the mold repair jig A of the present invention, by changing the combination of the bladed metal fitting (1) and the central steel bar 2, the size and driving position of the hole to be repaired can be freely changed. It is something.

[Brief explanation of drawings]

FIG. 1 shows the gold repair jig of the present invention, in which a shows a bottom view and b shows a front sectional view. FIG. 2 is a front view illustrating the state in which the mold repair jig shown in FIG. 1 is used. The symbols in the figure are metal fitting with blade, 2; center steel bar, 31 round bar, 4; circular blade, 5; screw, 6: hole to be repaired, 7I extraction, A+ mold repair jig, B+ Vertical holder, C: indicates mold to be repaired. Patent applicant Kei Inui, representative of Kyoritsu Kogyo Co., Ltd. − Agent Kazuyoshi Nagano, representative of Mitsubishi Gas Chemical Co., Ltd.

Claims (1)

[Claims] 1. Used for punching and punching plate materials such as metal plates, resin plates, fiber-reinforced resin plates, etc. for repairing enlarged holes that occur on the surface of the punching holder and die that faces the plate material. A mold repair jig, wherein the jig is configured to
゜1~11 Blade fitting (1) with large circular blade (4)
and a rod (3) with a central steel rod (2) suitable for insertion into the repair hole of the mold removably attached to the center of the bladed metal fitting.
A mold repair jig 2 characterized in that it consists of a bladed metal fitting (1) having a circular blade 0.1 to 11 larger than the repair hole of the mold, and Steel bar-shaped mold repair jig (G) consisting of a bar (3) with a central steel bar (2) suitable for insertion into the repair hole of the mold removably attached to the center of the bladed metal fitting. After inserting the material (2) and attaching the vertical holder ■ that holds the mold repair jig perpendicular to the mold surface, the top of the bar material (4) of the mold repair jig is A mold repair method in which the area around the repair hole is polished after driving, then removing the mold repair jig (2) and the vertical holder ■.