JPH012736A - Press processing equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) This defense is based on a press process equipped with an inverted plate presser that applies a force in the opposite direction to the punch to the material when punching a part from the material. Regarding equipment.

(Prior Art) In general, a press working device has a goo in which a punching hole is formed as is well known, and a punch that is driven forward and backward with respect to the wide punching hole of the die, The parts are punched and formed from the plate-shaped material. However, if the structure is such that the parts are simply punched out from the material using a forceps and a punch, the material may break during punching, and a good handling surface may not be obtained.

Therefore, in order to eliminate such problems, when punching parts from the material with a goo and a punch, the material placed on the die is held down by a temporary holding body, and the part that will become the part is reversed. A so-called fine blanking method is used in which a good handling surface can be obtained by pressing with a plate presser with a force in the opposite direction to the punch. According to the fine blanking method, it is possible to obtain a good blanking surface without any breakage. However, even if the fine blanking method is used, it is unavoidable that when a part is punched from a material, sagging will occur at the periphery of the material. Therefore, for example, if the part is a so-called tooth-shaped part a such as a gear or a rack as shown in Fig. 5, the tip of the tooth will have a sag C as shown in Fig. 6.
will occur. Therefore, when the toothed parts a are brought into mesh with each other, the contact area between them decreases, causing a problem that the toothed parts a cannot have the same performance as the toothed parts a.

(Problems to be Solved by the Invention) As described above, in the conventional press working apparatus, it has not been possible to prevent sagging from occurring in the periphery of a part punched from a material.

This invention was made based on the above-mentioned circumstances, and its purpose is to make it possible to eliminate the formation of holes around the parts when parts are punched out from materials. The purpose of the present invention is to provide a press processing device.

[Structure of the invention] (Means and operations for solving the problems) In order to solve the above problems, the present invention provides a method for punching parts from a material placed on a die. In a press processing device in which a part to be punched is pressed by a force in the opposite direction to the punch by a reverse plate presser, the reverse plate presser has the peripheral part at a position corresponding to the peripheral part of the part to be punched from the material. A convex portion forming a recess is provided along.

Furthermore, the convex portion of the inverted plate holding body prevents sag from forming around the parts.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. The press processing equipment shown in Fig. 1 is the equipment main body 1.
has. A die 3 having a wide punched hole 2 is mounted and fixed on the upper surface of the device main body 1. A punch 4 is disposed above the die 3 and is driven up and down in correspondence with the punching hole 2. Further, a plate holding body 5 that moves up and down in conjunction with the punch 4 is provided on the upper surface of the die 3. This plate holding body 5 is designed to hold the material 6 between the upper surface of the die 3 when the punch 4 descends and presses the plate-shaped material 6 placed on the die 3. It has become. Note that the cross-sectional shape of the punch hole 2 of the die 3 and the punch 4 is 6gl wide.

Therefore, the die 3 and punch 4 press-work the gear 7 as a part from the raw material 6.

The device main body 1 has an escape hole 8 at a location corresponding to the punching hole 2 of the die 3. J has been established. A reverse plate holding body 9 is slidably held in the relief hole 8 and is elastically held by a spring body (not shown).

This reverse plate presser rest 8 is used when the material 6 placed on the die 3 is pressed by the punch 4.
is elastically supported by a force in the opposite direction to the punch 4. This reverse plate holding body 9 has a cross-sectional shape or a gear-like shape, similar to the punch 1 punch hole 2 and punch 4 described above. In other words,
A large number of toothed portions 11 corresponding to the teeth of the gear 7 are formed on the peripheral portion of the reverse plate holding body 9, and the upper ends of these toothed portions 11 are slightly smaller than the toothed portions 11.
A convex portion 12 is formed.

Next, a case in which the gear 7 is pressed by the press working apparatus having the above structure will be described. First, after the material 6 is supplied onto the die 3, the punch 4 is lowered. Then, the plate presser 5 is linked to the lowering of the punch 4, so
As a result, it is pressed between the yAAC3 die 3 and the yAAC3 die 3. Next, the punch 4 enters the punched hole 2 while shearing the rope material 6, and the gear 7 is press-formed from the raw material 6.

When the gear 7 is machined from the material 6, the material 6
The reverse plate holding body 9 is elastically pressed against the lower surface side of the cable member 6.
The tooth $7 applies a force in the direction opposite to that of the punch 4 on the part where the punch is widened. In other words, since the gear 7 is punched out from the rope material 6 by the fine blanking method, the gear 7 does not have a vI cross section and has a good shear surface.

Also, the tooth portion 7 of the gear 7 that is press-worked in this way
A convex portion 1 is formed on the lower surface of the reverse insert body 9.
2 is in pressure contact. Then, a recess 13 is formed on the lower surface of the tooth 7a by the convex part 12 as shown in FIG. 13 and FIG. You will have to run away. Therefore, some of the material escapes to the tip side of the tooth portion 7a, thereby preventing droop from forming at the tip portion of the tooth portion 7a.

In the above embodiment, a gear is used as a part to be pressed, but it may be a rack or other tooth-shaped part having teeth, or even a part without teeth, and there is no limitation in this respect. In short, it can be applied to all parts made by press processing.

[Effects of the Invention] As described above, the present invention provides a press working apparatus equipped with an inverted plate holder for applying force in a direction opposite to the punch to the material during press working, and the inverted plate holder includes: A convex portion is provided at a location corresponding to the peripheral portion of the part punched from the above-mentioned material.

Therefore, the convex portion forms four parts on the part, and the material escapes to the surroundings accordingly, which has the advantage of preventing droop from forming on the periphery of the part.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the entire device showing one embodiment of the present invention;
Fig. 2 is a perspective view of a part of the reverse insert, Fig. 3 is a perspective view of a part of the gear as a pressed part, and Fig. 4 is a sectional view taken along the line ■-IV in Fig. 3. , FIG. 5 is a plan view of a portion of a gear formed by conventional press working, and FIG. 6 is a sectional view taken along the line Vl--Vl in FIG. 5. 3...Die, 4...Punch, 5...Temporary holding body, 6
...Material, 7.Gear (parts), 9.Reverse plate presser, 12.Protrusion. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 4 Figure 6 Figure 5

Claims (2)

[Claims] (1) In a press processing device that, when punching a part from a material placed on a die, presses the punched part of the material with a force in the opposite direction of the punch using a reverse plate presser, A press working apparatus characterized in that the inverted plate presser body is provided with a convex portion that forms a recess along the peripheral portion at a location corresponding to the peripheral portion of the component punched from the material. (2) The press processing apparatus according to claim 1, wherein the part is a tooth-shaped part.