JPH0386333A - Method for positioning press part - Google Patents

Abstract

PURPOSE:To use the same positioning pin several times by forming positioning holes for slots along the directions of the bent lines with which the axial centers are orthogonally crossed at parts making bent pieces of a press part. CONSTITUTION:When positioning holes 2 are formed at positions 1b making the bent pieces of the press part 1, for example, when the central part 1a such as a car outer panel, etc., appears on the outer surface, both its flange parts 1b come in contact with the upper surface of a car body base and its flange parts are covered with other parts, the appearance has no problem because the flange parts 1b are hidden. Further, since the slots 2 of the flanges 1b are formed in such directions that the axial centers (b) are orthogonally crossed with the bent lines (a), though the positions of the holes to the press machine deviate, those holes can be used for positioning again in the same state and the constitution can be simplified by reduction of the number of positioning members.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for positioning a press part in a press molding machine multiple times with reference to the same hole drilled in the press part.

(Prior art) When performing multiple bending processes or drilling processes on a single flat press part, it is necessary to position the flat press part in a press molding machine multiple times. When shaping the bottom of the press sequentially using a press forming machine, the first
Press parts are set in the press molding machine, and after molding, the press parts are taken out from the side with an arm or from above with a suction cup, and then transported to the next press molding machine. The position of parts must be regulated.

Conventionally, as a method for positioning a pressed part a plurality of times, a method disclosed, for example, in Japanese Utility Model Application Publication No. 1527/1983 is known.

The proposal in the publication is to drill holes for positioning in the press part,
By fitting and inserting a positioning pin that protrudes and retracts from the mold into this hole, positioning is performed multiple times.

(Problem to be Solved by the Invention) However, in the above conventional method, a hole is made in a part other than the bent part of the press part, such as the center part, and a pin is inserted into the hole for positioning. If the center part protrudes like a step and has low flanges bent at both ends, such as the outer panel of a car, the center part is exposed to the outside surface, and if there is a hole in that part, the appearance will be affected. This method cannot be applied because of the above problem.

Furthermore, conventionally, the positioning hole is a perfectly circular hole. However, in the case of a perfectly circular hole, when the flange portion is bent, for example, into an inclined shape, the position of the reading tag relative to the press molding machine will shift, and in that state it will no longer be possible to use it for positioning again. Therefore, there is a problem in that positioning pins must be provided at different positions.

The present invention has been made in view of these circumstances, and provides a press part that can be used with common positioning holes and positioning pins before and after flange processing when positioning a panel on a flange surface that does not affect the appearance. The purpose is to provide a positioning method.

(Means for Solving the Problems) The present invention provides a method for setting flat press parts that are bent at least in one place by press processing into a press molding machine, when removing them after bending, or when using other presses. In a method for positioning a press part, in which positioning is performed multiple times when setting the press part in a molding machine, etc. by inserting a positioning pin into the same hole drilled in the press part, As the hole, a long hole is formed along the direction in which the axis is perpendicular to the folding line in the part of the press part that will become the bent piece, and the length of the long hole is
The length of the long hole is set to a length that allows a fixed positioning pin to be inserted over the entire range of bending angle change of the bent piece of the press part, and the width of the elongated hole is set so that the positioning pin can be inserted over the entire range of the bending angle of the bent piece of the press part. The width is set to allow a pin to fit therein, and the pressed part is positioned along a direction other than the direction that coincides with the axis of the elongated hole.

(Function) According to the present invention, a positioning hole is formed in a portion of a pressed part that becomes a bent piece, so that the center part protrudes in a step shape and low flanges are formed at both ends, for example, as in the outer panel of an automobile. If the part is bent, there is no hole in the central part that is exposed on the outside, and when both flanges are welded to the car body base and the flange part is covered with another part. Since the product has a hole in the flange part that is hidden from the outside surface, there is no problem with the appearance.

In addition, the hole for inserting the positioning pin is a long hole in the bent piece part of the press part whose axis is perpendicular to the bending line, so when the bent piece is bent, for example, in an inclined shape, the press Even if the position of the reading tag with respect to the molding machine shifts, the hole can be used again for positioning in the same state. Therefore, the same positioning pin can be used multiple times, and the configuration of the positioning member can be simplified.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

This example is applied to positioning, for example, in the press molding process of automobile parts.
(D) schematically explains the shape change in each process of an automobile part as a pressed part.

A preformed product 1 is prepared by preparing a flat material with a rectangular plane and pressing this flat material to form a flange portion 1b with a high central portion 1a and a lower flange portion 1b at both ends, as shown in FIG. 1(A). Create. A long hole 2 for positioning is bored in each flange portion 1b of this preform 1. Then, the preformed product 1 is set in another press machine, and a trim step is performed in which the peripheral portion IC of the preformed product 1 is cut and shaped, as shown in FIG. 3(B). Thereafter, the shaped preform 1 is further set in another press machine, and a flange process is performed in which a part of the tip of each flange portion 1b is bent, as shown in FIG. Then, the process is finally transferred to a finishing press machine, where a piercing process is performed to form a large number of holes 3, as shown in FIG. Among the above steps, the positioning method according to the present invention is carried out for the trim step shown in FIG. 1(B), the flange step shown in FIG. 1(C), and the piercing step shown in FIG. 1(D).

Next, the positioning method according to the present invention will be explained in detail with reference to FIGS. 2 to 9. Figure 2 is a plan view showing the pressed part after the trimming process shown in Figure 1(B), Figure 3 is a side view of the same, and Figure 4 is the pressed part after the flange process shown in Figure 1(C). FIG. Further, FIG. 5 is a side view showing the configuration of a press forming machine used in the flange process and a set state of press parts, and FIG. 6 is a sectional view taken along the line V[-VI in FIG. 5. Furthermore, FIGS. 7 to 9 are perspective views showing positioning states in a trim process, a flange process, and a piercing process, respectively.

Note that the positioning in the trim process and the piercing process is almost the same as the positioning in the flange process, so the detailed positioning method will be explained for the flange process, and the positioning method for the trim process and the piercing process will be explained for the flange process. This will be briefly explained after the explanation.

As shown in Fig. 5, a press forming machine 4 for the flange process
The mold consists of an upper mold 4a and a lower mold 4b, and positioning pins 6 are respectively provided on a pair of air cylinders 5 fixed to the lower mold 4b so as to be retractable upward. During pressing, the upper die 4a is raised and the positioning pin 6 is made to protrude upward from the lower die 4b, and the elongated hole 2 of the preform 1 is engaged with the positioning pin 6, thereby forming the preform. Product 1 is set on the lower mold 4b.

Here, the elongated hole 2 of the preform 1 will be explained. Each flange portion 1a of the preform 1 before the flange process is flat (see FIG. 1(B), FIG. 2, and FIG. 3). After the flange process, a part of each flange part 1a is bent downward at a certain angle θ along folding lines a that face each other in a V-shape in plan view, thereby forming a downward flange part 7 (the first downward flange part 7). (See Figures (C), (D), Figures 4, 8, and 9, etc.)
.

A long hole 2 is formed in a portion that will become each flange portion 1a along a direction in which the axis is perpendicular to the folding line a. The length of the elongated hole 2 is set to a length that allows the fixed positioning pin 6 to be inserted over the entire range of the bending angle θ of the downward flange portion 7.

Further, the width of the elongated hole 2 is set to a width that allows the positioning pin 6 to be inserted through the entire axial direction.

However, when setting the 1,000N molded product 1, the flange portion 1b
is completely flat before being bent, and is placed on the lower die 4a in a horizontal state. A positioning pin 6 rising from below is inserted into each long hole 2, respectively. In this case, in each long hole 2, the positioning pin 6 allows
Positioning is performed along a direction other than the direction that coincides with the axis a, but since the elongated holes 2 are arranged to face each other in a V-shape and their orientations on the plane are different, the preform 1 cannot be positioned on the horizontal plane. Movement is restricted in two orthogonal axial directions xSy. In other words, the preform 1 is positioned in all directions on the plane.

In this positioning state, after the positioning pin 6 descends and escapes from the elongated hole 2, the upper die 4b descends to perform flange bending, and a portion of each flange portion 1b moves downward along the bending line a. It is bent at a constant angle θ.

After the bending process, the upper mold 4a rises and the preformed product 1 is taken out by an arm or suction cup (not shown) and transported to the next press molding machine, but in order to ensure the removal operation, positioning is required again. Is required. In this case, since the elongated hole 2 of the bent downward flange portion 7 is shaped along the direction perpendicular to the bending line a, if the positioning pin 6 is raised again, , the positioning pin 6 is inserted into the elongated hole 2 at a position biased toward the other end side than when set,
Positioning of the preform 1 is performed in the same manner as when setting.

The above operations are performed in substantially the same manner in the trim process and piercing process shown in FIGS. 7 and 9. That is, in the case of the trim process, as shown in Figure 7, positioning is performed multiple times when setting the preform 1 in the press molding machine 8 and when removing it after processing. This is commonly done by inserting positioning pins 9 into the respective long holes 2 of 1b. In addition, in the case of the piercing process, as shown in FIG. This is commonly done by inserting the positioning pins 11 into the long holes 2 of the portion 1b.

In this way, positioning is performed multiple times during each process, when setting the press part in the press molding machine 4.8.10 and when removing it after processing, using the elongated hole 2 of each flange part 1b, which is a bent piece. This is commonly done by inserting positioning pins 6, 9, and 11, respectively.

According to this embodiment, since the elongated hole 2 for positioning is formed in the flange portion 1b of the press part, the central portion 1a is exposed to the outside surface and both sides are placed on the vehicle body base, such as in the outer panel of a car. When the flange portion 1b is abutted and welded, and the flange portion is covered with another part, the flange portion 1b is hidden, so there is no problem in appearance.

In addition, since the elongated hole 2 of the flange portion 1b is formed along the direction in which the axis is perpendicular to the folding line a, the position of the reading tag relative to the press molding machine may shift due to the bending of the flange portion 1b. However, the hole can be used again for positioning in the same state, and the configuration can be simplified by reducing the number of positioning members.

In the above embodiment, both of the pair of flange portions 1b are bent and the elongated holes 2 are formed in both of them, but in the case where only one position is bent, one positioning hole may be made into a perfect circle. Good too.

In addition, the types of press parts and processing to be applied are not limited to those of the above embodiments, but various types can be applied as long as they have a basic axis for bending and can be bent in one direction. be.

(Effects of the Invention) As described above, according to the method for positioning a pressed part according to the present invention, a positioning hole is formed in a part of the pressed part that will become a bent piece, so the bent part can be replaced with another part. It is suitable for applications such as when applying to covered parts, and since the hole for inserting the positioning pin is a long hole in the bent part of the press part with the axis perpendicular to the folded part, the bent part For example, when the plate is bent into an inclined shape, even if the position of the reading tag is shifted relative to the press molding machine, the hole can be used again for positioning in the same state, and the configuration of the positioning member can be simplified. The effect is produced.

[Brief explanation of drawings]

The figure shows one embodiment of the present invention, and FIGS. 1(A) to (
D) is a perspective view schematically showing the shape change of the press part due to press forming, FIG. 2 is a plan view showing the press part after the trim step shown in FIG. 1(B), and FIG. 3 is a side view of the same. Fourth
The figure is a plan view showing the pressed part after the flange process shown in Figure 1 (C), Figure 5 is a side view showing the configuration of the press forming machine used in the flange process and the set state of the press part, and Figure 6 is a side view showing the press part set state. V [-Vl line sectional view in Figure 5, Figures 7 to 9
The figures are perspective views showing positioning states in a trim process, a flange process, and a piercing process, respectively. 1... Preformed product (press part) 1b...
...Flange part (bending part) 2... Long hole

Claims (1)

[Claims] Multiple times when setting a flat press part that is bent at least in one place by press processing into a press forming machine, when removing it after bending, or when setting it into another press forming machine, etc. A method for positioning a press part by inserting a positioning pin into the same hole drilled in the press part, wherein a bent piece of the press part is used as the hole for inserting the positioning pin in the press part. A long hole is formed along the direction in which the axis is perpendicular to the bending line in the part where In addition to setting the length so that a fixed positioning pin can be inserted across the length,
The width of the elongated hole is set to a width that allows the positioning pin to be inserted over the entire axial direction, and the press part is not positioned along a direction other than the direction that coincides with the axis of the elongated hole. Features a method for positioning pressed parts.