JPS5870930A - Scrap removing method in press working - Google Patents

Abstract

PURPOSE:To ensure separation of scrap by forming a hollow on the back of a scrap part to be removed by shearing, and pushing the scrap against the inner wall of a die at the time of shearing and thereby preventing the scrap from rising up from the die. CONSTITUTION:A hollow 9a of specified depth is formed by coining on the back of a part that becomes a scrap of a metallic sheet. The sheet 3 having a hollow 9a on the back is sheared in a shearing process. Contact of the sheared scrap with the inner wall of the die is increased and the scrap 9 does not move upward when the punch 4 is raised. Thus, the scrap 9 is separated surely and stable shearing is performed continuously.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for removing scrap in press working of plate materials, and its purpose is to improve the operating efficiency of press equipment by reliably separating processed material from scrap. In particular, there is.

A conventional method for removing scraps in press working of this kind of plate material will be explained with reference to FIGS. 1 and 2.

Generally, a press device as shown in FIG. 1 is used to form holes, notches, etc. in a long strip-shaped thin metal plate. The press device includes a lower mold (2) that is in a fixed state, and an upper mold (1) that is connected to the lower mold (2) by a connecting member aυ and can move up and down, and a punch attached to the upper mold (1). (4
) and the guide (5) attached to the lower mold (2),
A hole is made in the thin metal plate (3) conveyed between the two (4) and (5). Generally, the steel plate of 11W or less has a thickness of 1.5~
A 40-50 ton press that drills a hole twice the diameter is 100
It is operated at a high speed of 0 revolutions/rotation degree, and the processed thin metal plate (3) is discharged to the right in the wJ1 diagram, and the punched scrap is discharged into a 'C-shaped top that passes through the escape hole α4 of the lower die (2). Ru. At this time, in order to maintain the life of the punch (4) and the cutting blade of the "Guit5J", cutting oil is applied onto the metal plate (3) using the oil supply device Ql, and the scrap is removed using the suction device (
8), it is tilted downward to absorb it.

Fig. 2 shows the shearing process, in which the punch (4) descends from the state shown in Fig. 2 (a) to perform shearing, and as shown in Fig. 2 tb+
The scrap (9) sheared at the hole (5a) of the guide (5)
), and then, in FIG. 2(C), the punch (4) rises together with the upper die (1). At this time, the external dimensions of the scrap (9) that are sheared and separated are approximately the same as the inner diameter of the cutting edge of the guide (5), and the inside of the hole (5a) of the die (5).
As soon as it makes light contact with (5b), it will fall downward.<<
For this reason, the adhesive force of the cutting oil between the punch (4) and the scrap (9) and the negative pressure accompanying the upward movement of the punch (4) sometimes cause the punch (4) to break as shown in Figure 2 (C). ) and the scrap (91) may float up, which may hinder the feeding of the thin metal plate (3) and has the drawback of making it impossible to foresee a complete stoppage of the press process.

To deal with this, a suction device (
Although scrap (9) is absorbed by 8),
The above-mentioned situation still tends to occur when the sheared area becomes difficult or the size of the mold becomes large.

The present invention has been made to eliminate the above-mentioned conventional drawbacks, and will be explained below with reference to FIGS. 3 and 4. Note that parts that are the same as those in the conventional example are given the same numbers, and their explanations will be omitted. In FIG. 3, (7) is an impression punch provided on the lower mold (5), and a conical or filament-shaped punch part (7a) is provided at the tip of the punch that protrudes from the upper surface of the lower mold t51. There is. The stamping bunch (7) is located before the above-mentioned shearing process, and is used to collect scraps (9) of the thin metal plate (3).
A coining process is performed on the back side of the part that should become , as shown in FIG. 4(a). For the metal thin plate (3), a material such as a steel plate or a brass plate with a thickness of 111III or less is selected, and as shown in Figure 4 (a), the distance JIIA between the planned shear line and the base of the bunner part is approximately - of the plate thickness. The maximum depth of the recess (9a) formed by the coining process is set to be approximately - the thickness of the plate.

The stamping bunch (the thin metal plate (3) in which the recess (9a) has been formed by the force) is sheared as shown in FIG. 4(b) by the same shearing process as described above. Due to the moment caused by (h)), the concave 1
The scrap that formed t' (9a) (91111 minutes is H
The lateral pressure on the inner wall (5b) of the hole (5a) of the die (5) is increased by receiving a deforming force in the direction. Then, due to the increased side pressure, when the punch (4) rises as shown in Fig. 4 (C), even if the upward force on the scrap (9) due to the adhesive force of the oil film and negative pressure acts on the scrap (9), the scrap (9) will not move. There is no upward movement, and stable shearing is performed in sequence.

As mentioned above, one of the methods for removing scraps in press working according to the present invention is to form a concave part by coining bunching in the first step of shearing process, so that the scraps are pressed against the inner wall of the die by side pressure during shearing. Because it is deformed into a die, the scrap does not float up from the die like in the past, allowing for stable scrap removal and improving the operating efficiency of the press equipment. be.

[Brief explanation of drawings]

Fig. 1 and Fig. 2 show a conventional example, small L1 Fig. 1 shows a partially simplified press device;
1 and (C) are explanatory diagrams of the processing steps, FIGS. 3 and 4 show an example of the present invention-(7), and FIG. 3 is an Ares device! 4 is an explanatory diagram showing the processing steps. (11 Upper mold (2) Lower mold (3) Thin metal plate (4) Punch (5) Die (5a) IE in hole (5b) 47) Impression bunch (
7a) Panna portion (9) Scrap (9a) Concave portion Patent applicant Alps Electric Co., Ltd.

Claims (1)

[Claims] A recess of a predetermined width of 5 mm is formed in advance on the back surface of the scrap No. 7 to be removed by shearing, and the contact force with the inner wall of the scrap is increased by deforming the scrap metal shape during shearing.
:Featured press-method for removing scrap during processing,