JPH07112221A - Die for double action press - Google Patents

Abstract

PURPOSE:To perform a working with high accuracy by making an upper die engage with a base stock to be worked and a lower die to make them concentric, guiding a punch by the upper die, and to attain a product free from the generation of a shift in a print position even when using a printed base stock before forming. CONSTITUTION:When holding down a base, stock 9 to be worked by an upper die 1 and a lower die 2, positioning is made so that the base stock 9 to be worked, the upper die 1 and the lower die 2 are concentric by engaging the hanging-down edge 1a of the outer periphery of the upper die 1 and the lower die 2, and they are fixed. A brace 3 is engaged in the punch guide part of the upper die 1 to smoothly guide a punch 4 by the minimum slidable clearance. In the punch 4, floating elements 5a and 5b with a sufficient clearance in their diameter directions and an elastic plate made of urethane resin, etc., are provided to allow that the floating elements 5a and 5b float a little in the punch 4, and they are connected to the lower end of a punch lever 7 through a spherical surface part 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backward pressing die for drawing a metal plate.

Conventionally, coating and printing have been carried out after the product has been press-molded, but since troublesome three-dimensional printing is required, coating and printing on a two-dimensional processed material (plate) before press-molding
After printing, press work has come to be performed. At that time, it is necessary to prevent the printing position from being displaced during molding, and high-precision press working is required.
Especially when printing the water level scale of the rice cooker, strict processing accuracy is required so that the water level scale of the product is in the correct position.

[0003]

2. Description of the Related Art Since the upper die and the lower die of a backward movement press are guided by the slides of the press respectively, a gap is generated in the conventional die structure due to the play, and the punch and the upper die are prevented from seizing. Due to this, there was no choice but to guide by a large play, so there was a gap between the center of the processing material and the center of the mold,
High-precision processing was impossible.

[0004]

DISCLOSURE OF THE INVENTION The present invention is a structure of a die which enables highly accurate working in drawing by a backward movement press.

[0005]

To achieve this object, according to the present invention, when the work material is held down by the upper die and the lower die, the work material is positioned and the upper die and the lower die are fitted to each other. An upper mold outer peripheral hanging edge for fitting the work material and the lower mold is provided so that the mold, the lower mold and the work material are concentric.

[0006] The upper punch guide portion guides the punch with a minimum play that allows sliding.

The punch is composed of a punch, a mover having a sufficient clearance in the punch, and a punch rod connected to the mover.

Further, it is preferable that a spherical portion is provided at the lower end of the punch rod so as to make spherical contact with the idler.

[0009]

When the work material is held down by the upper die and the lower die, the upper die, the lower die and the work material are fixed to the correct positions on the same core by fitting the outer peripheral hanging edge of the upper die and the lower die.

The punch is guided concentrically by the upper die punch guide portion without displacement.

While the punch is guided by the upper mold, the punch rod is guided by the slide of the press on the upper part apart from the upper mold, so that the punch rod is affected by the precision and deformation of the press and the movement of both is affected. Accidents such as seizure are likely to occur in a sliding part with a small play due to deviation, but the punch and the punch are built into the punch by connecting the mover having sufficient play and the punch rod. The mover absorbs the deviation of the movement of the rod,
The punch is smoothly guided by the upper mold and there is no risk of seizure.

By making the lower end of the punch rod spherical and making spherical contact with the mover, the inclination (angle) deviation of the movement of the punch and the punch rod can be absorbed more smoothly.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a front sectional view showing an embodiment of the present invention, in which 1 is an upper mold and 2 is a lower mold. When the upper die 1 and the lower die 2 hold down the work material 9, the outer peripheral hanging edge 1a of the upper die 1 is fitted to the outer periphery of the lower die 2 to form the work material 9, the upper die 1 and the lower die 2.
Position and fix them so that they are concentric.

The punch guide portion of the upper die 1 is fitted with a receiving metal 3 so that the punch 4 can be smoothly guided with a minimum playable space.

In the punch 4, there are provided a mover 5 having a sufficient clearance in the radial direction and an elastic plate 6 made of urethane resin or the like, and the mover 5 is allowed to allow some movement within the punch 4. The idler 5 and the lower end of the punch rod 7 are connected.

In FIG. 2, a spherical portion 8 is provided at the lower end of the punch rod 7,
In this example, the upper portion 5a of the idler 5 and the lower portion 5b of the idler 5 are gripped and connected.

[0018]

According to the present invention, when the backward pressing die is used, the work material 9, the upper die 1 and the lower die 2 are concentrically fixed, and the punch 4 is accurately guided to the upper die 1. Highly accurate processing can be performed, and even if a processing material printed before molding is used, the printing position of the product does not shift.
Also, the processing material 9 does not need to have a margin on the outer circumference,
Therefore, the processing material is directly used as a product without the step of cutting the edges generated by the drawing process, and the processing cost is reduced.

The punch 4 is guided to the upper die 1 with a small clearance, but since the punch 4 is connected to the punch rod 7 through the mover 5 having a sufficient clearance, the precision and deformation of the press, etc. The deviation of the movement between the punch 4 and the punch rod 7 due to the influence of is absorbed, and the sliding portion operates smoothly without causing an accident such as seizure.

If a spherical surface portion 8 is provided at the lower end of the punch rod 7 as described in claim 2 and the idler upper portion 5a and the idler lower portion 5b are grasped by spherical contact, a space between the punch 4 and the punch rod 7 is formed. In addition to the displacement in the radial direction, the displacement in the angle can be smoothly absorbed, and the play between the punch 4 and the upper die 1 can be reduced, thereby improving the precision and the life of the die.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an embodiment of the present invention.

FIG. 2 is a front sectional view showing an embodiment in which a punch rod 7 and a slider 5 are connected by a spherical surface portion 8.

FIG. 3 is an explanatory view showing the operation of FIGS. 1 and 2, (a) when supplying the processing material 9 (b) when the upper material 1 and the processing material 9 and the lower material 2 are engaged (c) is a diaphragm Indicates the time of processing.

FIG. 4 is a front sectional view showing an example of a conventional backward movement press die.

FIG. 5 is an explanatory view showing an example of the configuration of a backward movement press for mounting the mold of the present invention. (Front view)

6 is a bolster 10, a roller 11 and a cam 12 of FIG.
It is a partial view (side view) showing.

[Explanation of symbols] 1 Upper mold 2 Lower mold 3 Receiving plate 4 Punch 5 Floating element 6 Elastic plate 7 Punch rod 8 Spherical part 9 Processing material 10 Bolster 11 Roller 12 Cam 13 Main shaft 14 Drive gear 15 Punch crank 16 Connecting rod 17 Punch Slide 18 Ram position adjusting screw 19 Ram 20 Frame

Claims (2)

[Claims] 1. In a backward-moving press die in which a material to be processed is suppressed by an upper die and a lower die, and then punched by a punch, an outer peripheral hanging edge 1a for fitting the material to be machined 9 and the lower die 2 concentrically is provided. The punch 4 is guided by the upper mold 1 provided, and a mover 5 for allowing a slight movement is provided in the punch 4, and the mover 5 and the punch rod 7 are provided.
A die for a backward motion press, characterized by connecting the lower ends. 2. The backward pressing die according to claim 1, wherein a spherical portion 8 is provided at a lower end of the punch rod 7 so as to make spherical contact with the idler 5. Type.