JPS59107733A - Positioning method of plate-like work - Google Patents

Abstract

PURPOSE:To position a plate-shaped work with good accuracy by subjecting the work to main pressing for forming the main shape of the work and forming a projecting part for positioning wherein the plate face of the work projects at a right angle direction to a part of the work at the same instant. CONSTITUTION:A projecting part 42 for positioning is formed on the plate surface of a plate-shaped work 40 inclined relatively with the base plate surface of the work in the drawing shape part thereof at the same instant when the main shape of the work is formed on the work 40 by drawing. The front projecting surface or rear recessed surface of the part 42 is engaged with the engaging recess or engaging pin of a positioning device disposed in the succeeding work station, whereby the central position or the angular position around the center of the work 40 is determined in said station.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for sequentially press-forming individual plate-shaped workpieces at a plurality of stations, and for positioning the plate-shaped workpieces at each station. It is.

Conventionally, in a series of press processing lines, one of the methods for positioning a plate-like workpiece at the workpiece processing position of the press die at each processing station is to draw the main shape formed on the workpiece by drawing in the first half of the line. Use the part
Positioning for subsequent processes has been carried out by attaching the constricted portion to a corresponding portion provided in advance on a work holder or the like. However, this method is effective when the drawn part of the workpiece is deep to a certain extent, but if it is shallow, sufficient positioning accuracy may not be maintained in the subsequent process, which may be a factor in increasing the product defect rate. was.

Therefore, another method is to punch out positioning holes at the same time as the drawing process to form the main shape of the workpiece in a part of the workpiece where it is acceptable to make holes, and use these holes to perform positioning in the subsequent process. A method of doing this was also adopted.

However, depending on the workpiece, when forming positioning holes at the same time as the drawing process, the hole punch or die may not be able to move in the direction perpendicular to the pressing direction due to elongation deformation (tension) that occurs in the workpiece due to drawing. Unbalanced loads containing components are applied, which frequently causes galling or breakage of the punch, making it difficult to form positioning holes.

Of course, it is not impossible to consider punching the above-mentioned positioning holes in a separate process after drawing, but even if this is done, the positioning of the workpiece is unstable to begin with, and sufficient accuracy in positioning the hole relative to the workpiece cannot be obtained. As a result, variations occur in the positioning hole itself, which should serve as a reference, resulting in an ineffective positioning function.

With this background in mind, the present invention provides a method for positioning a plate-like workpiece at each station as described above.
The object of this invention is to provide a positioning method that allows accurate positioning regardless of the drawing depth of the main shape of the workpiece and whether or not a positioning hole is formed.

The gist of the present invention is to apply the main pressing process to the plate-shaped work to form the main shape of the plate-shaped work, and at the same time to apply a press process to the part of the plate-shaped work that is unnecessary as a product. A plate-like workpiece locally forms at least one positioning convex part protruding perpendicularly to the plate surface, and at a station of the subsequent press working process, the convex surface and/or concave back surface of the positioning convex part and the station mentioned above are formed. The center position and/or the angular position around the center of the plate-like workpiece is determined by engaging the positioning device located at the center of the workpiece.

If such a positioning convex part is used to position a plate-shaped workpiece, when forming the four positioning parts at the same time as the main pressing process on the workpiece, there is a possibility that material tension will occur at the part where the four part of the workpiece is formed. However, since slippage between the die and punch and the workpiece (material) is allowed, the positioning protrusion can be easily formed without causing damage to the press shape material, and the drawing depth of the main shape of the plate-like workpiece can be reduced. Effective positioning of a wide workpiece is possible regardless of its size.

Moreover, since the positioning convex portion is formed by directly defining the positional relationship with respect to the main shape of the workpiece at the same time as the main press processing of the plate-shaped workpiece, the positioning accuracy of the positioning convexity with respect to the main shape of the workpiece is high. Therefore, it is possible to accurately position the workpiece in the subsequent process, which in turn leads to a reduction in the defective rate of the product.

Hereinafter, a more detailed explanation will be given based on the embodiments shown in the drawings. This embodiment is an example of a process in which a plate-shaped workpiece to be used as a backing plate for a vehicle drum brake is pressed, and the plate-shaped workpiece is positioned at a processing position.

What is shown in Fig. 1 is a plate-shaped workpiece 2 that has been hammered into a circular shape.This plate-shaped workpiece 2 is sequentially pressed at multiple processing stations as shown in Figs. 2 and 3. As a result, an intermediate product 4 of the backing plate is obtained. Therefore, at a processing station upstream of the press line, the flat workpiece 2 shown in FIG.
In this case, when performing the drawing process, a positioning convex portion 6 is formed on a part of the workpiece 2 at the same time as the drawing process in a form in which the plate surface of the workpiece 2 is locally protruded in the right angle direction. In this embodiment, one positioning convex portion 6 is provided at a position offset by a certain distance from the center of the workpiece 2, and is punched out in a direction parallel to the center line of the workpiece 2. It is desirable to form this positioning convex part 6 in a part that is unnecessary for the product and will not cause a nuisance, or in a part that will be drilled and removed in a subsequent process, and for its formation. This may be achieved by, for example, providing a protrusion for forming a convex portion in a nested manner on one of the drawing punch and the die, and providing four portions corresponding to the protrusion on the other. What should be formed for workpiece positioning is a convexity, not a hole, and the elongation that occurs in the convexity forming part of the workpiece during the drawing process is allowed by the slippage of the workpiece material. The positioning convex part 6 can be easily formed together with the main shape, and since it is formed at the same time as the drawing process, the workpiece 2
The positioning accuracy of the positioning convex portion 6 with respect to the aperture shape (main shape) portion is high. A center hole 8 is formed in the center of the workpiece 2 at the same time as or after drawing the main shape of the workpiece, and the axle is passed through this center hole 8 when the product is manufactured.

After the positioning convex portion 6 is provided as described above, the workpiece 2 is positioned at the station of the subsequent press working process using the positioning convex portion 6. A specific example of the positioning form will be explained based on FIG. 4.

As shown in FIG. 2, the outer peripheral edge of a workpiece 2 whose main shape has been formed is bent using a die 12 fixed to a guide holder 10 and an elevating punch 16 attached to a punch holder 14. This is a press process station for forming an annular rising protrusion (7 cylindrical flange) 18 as shown in FIG. A work holder 20 is provided inside the die 12 so as to be able to slide in the direction of movement of the punch 16 and is biased upward by a cushion pin 22. 16, a presser plate 24 is attached to the punch 1.
slidable relative to 6 in its direction of movement;
It is also provided in a state where it is urged downward by a spring 26. The work holder 20 has a work support surface that faces the aperture-shaped portion of the work 2 and is provided with a circular relief hole 28 at the center of the support surface. on the work support surface of
Further, the outer peripheral portion is supported by two surfaces of the die 12. Then, the center pilot pin 30 fixed at the center of the presser plate 24 fits into the center hole 8 of the workpiece 2 with high precision. Note that the work holder 20 and the presser plate 24 are movable in the vertical direction, but are prevented from rotating around the center by slide pins (not shown).

On the other hand, in the work holder 20, an engagement pin 32 having a shape that can be brought into close contact with the concave back surface of the positioning convex portion 6 of the workpiece 11 protrudes from the work supporting surface by a dimension corresponding to the shape of the concave back surface. The bolt 34 has an IQ of 2.

The angular position around the center of the workpiece 2 is determined by engaging the tip of the engagement pin 32 (which functions as an engagement protrusion) with the concave back surface of the workpiece positioning projection 1II6. Since the aperture-shaped portion of the workpiece 2 is shallow, the angular position around the center of the workpiece 2 cannot be precisely defined by engagement between the aperture-shaped portion and the workpiece support surface. By engaging the tip of the dowel pin 32, the workpiece 2 can be positioned at the processing position of the press die with high precision, and the workpiece holding surface of the presser plate 24 corresponding to the drawing-shaped portion of the workpiece 2 is
It can be brought into close contact with Waraku 2 without discrepancies. therefore,
The annular rising protrusion 18 is formed with high precision.

Furthermore, an engagement recess 36 that can engage with the convex surface of the positioning convex part 6 is provided on the workpiece holding surface of the presser plate 24. When bending the peripheral edge, by engaging the four engaging parts 36 with the convex surface of the positioning convex part 6, the workpiece 2 is only positioned around the center during the bending process, and the initial positioning state is maintained. can be maintained stably. Note that a step of punching out and removing the positioning convex portion 6 may be added.

Next, another embodiment of the present invention will be explained based on FIGS. 5 to 8.

In this example, when the temporary workpiece 40 is drawn to form the main shape of the workpiece as shown in FIG. A positioning convex portion 42 is formed at the center of the workpiece 40 and recessed inward. In the subsequent processing station, the positioning convex portion 42 will be used to position the workpiece 40. Here, as an example, as shown in FIG. When forming the flange 44,
That is, a positioning form at a bending station as shown in FIG. 7 is shown.

In FIG. 7, 46 is a bending punch fixed to the punch holder 48, and an annular die 50 is provided opposite the bending punch 46.
It can be raised and lowered along with the

A presser plate 54 is provided inside the die 50, and a center pilot pin 56 is provided through the center of the presser plate 54 so as to be movable relative to the die 50 and the presser plate 54 in the axial direction. spring 5
8 in a direction protruding toward the bending punch 46 side. The pilot pin 56 has a tip shape that corresponds to the back side of the positioning convex portion 42 of the workpiece 40, and the workpiece 40 is supported by an ejector ring 62 provided so as to be movable in the vertical direction via a cushion pin 60. Ru.

Then, in the state before bending, the center position of the work 40 with respect to the press die is determined by engaging the back surface of the workpiece convex portion 42 with the tip QjtJ of the pilot pin 56, and the work 40 is positioned at the press work position. In this state, the die 50 is lowered as shown in FIG.
The outer peripheral edge of 0 is bent and raised to form a cylindrical flange 44. Here, a leading pin 63 is fixed to the die 50 to prevent the workpiece 40 from being pinched between the die 50 and the ejector ring 62, and the positioning convex portion 42 of the workpiece 40 is connected to the bending punch 46.
It fits into the insertion hole 64 provided at the center of the workpiece holding surface.

Note that in this embodiment, since the main shape of the work 40 is asymmetric (foreign object), 1. ys 蛯X*XX ME F! =/IIl The position around the center of the workpiece 40 is also determined, but if the position around the center cannot be determined depending on the main shape of the workpiece 40, the workpiece 40 is provided with a positioning protrusion 42 at the center.
Separately, if another positioning convex portion is formed at a location away from the center of the workpiece, and a pilot pin is added correspondingly, it is possible to position not only the center position of the workpiece 40 but also the center position of the workpiece 40.
The angular position around the center can also be determined uniquely.

Also, regarding the aforementioned workpiece 2 shown in FIG. 4 etc., in addition to the positioning convexity 6, another positioning convexity is formed at a symmetrical position with respect to the center of the workpiece, for example, and an engagement pin that engages with it is formed. Alternatively, by adding an engaging protrusion, the center position of the workpiece 2 and the angular position around the center can be determined simultaneously without using the center hole 8, and the workpiece center can be determined without relying on the center pilot pin 30. It becomes possible to define the position.

In addition, although specific explanations are omitted, it is of course possible to embody the present invention by adding various changes and improvements based on the knowledge of those skilled in the art, as long as they do not depart from the spirit of the present invention.

[Brief explanation of the drawing]

FIGS. 1 to 3 show a plate-like workpiece to which the present invention is applied.
FIG. 4 is a perspective view showing examples of shapes depending on the stages of the press working process, and FIG. 4 is a sectional view showing a specific example of the positioning form of the workpiece at the -working station. 5 and 6 are perspective views respectively showing examples of the shape of another plate-like work according to the processing stages to which the present invention is applied, and FIGS. FIG. 7 is a cross-sectional view showing a specific example of the positioning form in the establishment; FIG. 7 shows the state before processing, and FIG. 8 shows the state during processing. 2.4'0: Plate workpiece 6.42: Positioning i6 protrusion 8: Center hole 12.50:
Dice 16: Punch 24.54: Holding plate 30: Center pilot pin 46: Bending punch 56' Center pilot pin (positioning device) 62: Ejector ring Attendant Hosei Brake Industry Co., Ltd.

Claims (1)

[Claims] i. A method for positioning a plate-like workpiece at each station when sequentially press-working another plate-like workpiece at a plurality of stations, the method comprising: forming the main shape of the plate-like workpiece; At the same time as main pressing is performed on the plate-like workpiece, at least one portion of the plate-like workpiece that is locally protruded perpendicular to the plate surface is applied to a part of the plate-like workpiece that is unnecessary as a product. By forming a positioning convex portion and engaging the convex surface and/or back surface of the positioning convex portion with a positioning device disposed at the station in a subsequent press working station, the plate-like workpiece is A method for positioning a plate-like workpiece, the method comprising determining a center position and/or an angular position around the center.