JPH0527217Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement of a processing device for positioning reference in a press.

(Prior Art) Conventionally, as shown in FIG. 4a, when drawing (pressing) a workpiece 1, there are positioning holes 2, which are used in subsequent processes such as piercing and trimming. 2 to the flange part 3 of the workpiece 1 at the same time,
Since the hole drilling is performed at the initial stage of the drawing process, there is a problem in that when the flange portion 3 is stretched during the drawing process, it deforms into an elongated hole shape and cannot be used as a positioning reference.

Therefore, as shown in Figure 4b, by machining notches 4, 4 in the flange part 3 instead of drilling holes, the flange part 3 will not deform even if it is pulled, and as shown in Figure 6. As shown, a technique has been proposed in which the positioning pins 5 in the post-process fit together and become the positioning reference (see Utility Application No. 123350/1989), but the processing equipment for the notches 4 and 4 is As shown in FIG. 5, a notching punch 9 is provided on the upper mold 8 facing the lower mold 7, and the notching punch 9 is provided between the upper mold 8 and the blank holder 10 so that the notching is performed at the initial stage of drawing of the workpiece 1. , the flange part 3 is restrained by the notch processing, and the drawn part 6
There was a problem that wrinkles appeared.

(Purpose of the invention) The present invention was made in order to solve the above-mentioned conventional problems, and its purpose is to perform notch processing so that wrinkles do not occur in the drawn portion of the workpiece.

(Structure of the invention) Therefore, the present invention is provided with a lower die punch, an upper die, and a blank holder, the blank holder is supported from below by a cushion pin, and cutting edges are formed on both sides of the blank holder, A notching die having a bending die formed between the two cutting edges is provided, and is supported by a blank holder so as to be able to swing up and down, and comes into contact with a fixing part of the device just before the drawing process is completed by the upper die. rocked down,
A link-type punch is provided to form a notch in a workpiece in cooperation with the above-mentioned notching die.

(Effects of the invention) According to the invention, the link-type punch of the blank holder swings downward just before the drawing process by the upper die ends, and works together with the notching die to form a notch in the workpiece. This minimizes workpiece restraint and prevents wrinkles in the drawing area.

Furthermore, according to the present invention, the upper die having the upper die surface for drawing that faces the lower punch is located above the lower punch having the lower die surface for drawing the workpiece. There is no need to turn the workpiece before the trimming process after drawing the workpiece, greatly improving product production efficiency.

Furthermore, according to the present invention, since both the link type punch and the notching die are supported by the blank holder, which is a common member, it is difficult for errors to occur in the fitting of the two, and it is also possible to check the fitting of both. It's easy.

Furthermore, according to the present invention, a link type punch for forming a positioning notch and a die for notch processing are provided on a blank holder having a function of holding a workpiece between the bottom surface of the upper die and a positioning notch is formed. As a result, the number of parts is small, the structure is simple, and the device is compact.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the base (device fixing part) 13
A lower die punch 14 is installed above, and the lower die punch 1
On the upper surface of 4, there is a lower mold surface 14 for drawing the workpiece 1.
a is formed.

An upper die 15 that is moved up and down by a press slide (not shown) is arranged above the lower punch 14, and the lower punch 14 is disposed on the lower surface of the upper die 15.
The upper mold surface 15 for drawing facing the lower mold surface 14a of
a is formed.

A frame-shaped blank holder 16 is fitted around the outer periphery of the lower die punch 14 so as to be movable up and down.
It is biased so that it is aligned with 4a.

The blank holder 16 and the lower surface 15b of the upper die 15 grip the plate material 1' which will become the flange portion 3 of the workpiece 1.

A notching die 18 is fixed inside the upper surface 16a of the blank holder 16.

As shown in detail in FIG. 3, the notch processing die 18 has cutting edges 18a, 18a formed on both sides, and the bending die 1 is inserted between the cutting edges 18a, 18a.
8b is formed.

A workpiece 1 is provided on the outside of the upper surface 16a of the blank holder 16 in conjunction with a notching die 18.
A link type punch 19 for machining a notch 4 in the flange portion 3 of is pivotally attached to a bracket 20 with a pin 21 and supported so as to be vertically swingable.

As shown in detail in FIG. 3, the link type punch 19 has cutting edges 19a, 19a formed on both sides,
A bending die 19b is formed on the front side.

The link type punch 19 is attached to the blank holder 1
When the blank holder 16 moves upward, the spring 22 urges it to the upper swing position, and when the blank holder 16 moves downward, the rear end 1
9c comes into contact with a fixed rod 23 erected on the base 13, thereby swinging downward.

Note that the guide portions 16b, 16b of the blank holder 16 are fitted into the fixing rod 23, so that the blank holder 16 is guided up and down.

With the above configuration, as shown in Figure 1,
After placing the plate material 1' on the upper die surface 14a for drawing of the lower die punch 14, when the upper die 15 is moved downward,
Lower surface 15b of upper die 15 and blank holder 1
6, the plate material 1' is held between the lower die surface 15a for drawing of the upper die 15 and the lower die punch 1.
The workpiece 1 is formed by drawing the plate material 1' with the drawing upper die surface 14a of No. 4.

As shown in FIG. 2, as the upper die 15 moves downward, the blank holder 16 also moves downward, and the rear end 19c of the link type punch 19 contacts the fixed rod 23 and swings downward. Just before the bottom dead center of the die 15, that is, just before the drawing process of the plate material 1' ends,
The cutting blades 19a, 19a of the link type punch 19 and the bending die 19b are the cutting blade 18 of the notching die 18.
a, 18a and the bending die 19b, and a notch 4 is formed in the flange portion 3 of the workpiece 1.

Therefore, since the notch 4 is machined after most of the drawing part 6 of the workpiece 1 has been processed, the restraint of the workpiece 1 by the notch processing die 18 and the link type punch 19 can be minimized, and the drawing part 6 can be machined. Wrinkles will no longer appear.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the processing device according to the present invention before processing, Fig. 2 is a sectional view of the device of Fig. 1 during processing, and Fig. 3 is a perspective view of the main parts of the notch processing die and link type punch. Figures 4a and 4b are perspective views of the workpiece, Figure 5
The figure is a sectional view of the processing device before improvement, and FIG. 6 is a plan view showing the relationship between the notch and the positioning pin. DESCRIPTION OF SYMBOLS 1...Workpiece, 2...Flange part, 4...Notch, 6...Drawing part, 13...Base, 14...Lower die punch, 14a...Upper die surface for drawing, 15...
Upper die, 15a...lower die surface for drawing, 16...
... Blank holder, 18 ... Notch processing die, 18a ... Cutting blade, 18b ... Bending mold, 1
9...Link type punch, 22...Spring, 2
3...Fixed rod.

Claims (1)

[Claim for Utility Model Registration] An apparatus for simultaneously processing a positioning notch to be used in a subsequent process during drawing of a workpiece, comprising: a lower die punch having a lower die surface for drawing the workpiece; The upper die, which has opposing upper die surfaces for drawing processing, is supported from below by a cushion pin, and is fitted around the outer periphery of the lower punch so as to be movable up and down, and the work piece is inserted between the lower surface of the upper die and the lower surface of the upper die. A blank holder for gripping the blank holder is provided, the blank holder has cutting edges formed on both sides,
A notching die with a bending die formed between the two cutting edges is provided, and is supported by the blank holder so as to be able to swing vertically, and comes into contact with a fixed part of the device immediately before the drawing process is completed by the upper die. 1. A processing device for positioning reference in a press, characterized in that a link-type punch is provided which is pivoted downward and forms a notch in a workpiece in cooperation with the above-mentioned notching die.