JPS6228029A - Bending metallic mold - Google Patents

Abstract

PURPOSE:To execute exactly vertical bending of a lead by one process, by bending the lead of a work which has been positioned and fixed by a pat onto a die to right angles by descending a punch, and bending further the lead to a die side tapered face by oscillation of the punch. CONSTITUTION:A connector pin (work) C provided with a straight lead A is placed on a die 3 on a die plate 2, and by guide rod 18 of a pad 10 which is energized by a spring 16 and inserted through an open hole part 8a of an arm 8, the work is positioned and fixed to a mold body 5 of a descending ram. Also, when a punch 4 descends, a punch 9 of the tip of the arm 8, which has been positioned by a pin 7 and stoppers 12, 13 bends vertically the lead A. Subsequently, by drawing up a hydraulic cylinder 11, the arm 8 is inclined forward by using the pin as a supporting point and the punch 9 presses the lead A against a tapered face 3a of the side face of th die 3. The lead A of the work C which has been taken out becomes an exact vertical bend by spring- back. Vertical bending of the lead A is executed exactly by one process, and the man-hours are reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bending die for bending leads used for connector pins of connectors at right angles.

Summer of Disaster 1■ Recently, connector pins of connectors are sometimes made from straight leads bent at right angles. This lead bending process is carried out by placing a workpiece (C), which is made up of a predetermined number of leads (A) connected by tie bars (B) as shown in Figure 3, on a die set in a press machine. After positioning and fixing the workpiece (C) on the die, the lead (A) was bent at a right angle as shown in FIG. 4 by lowering the punch located above the die.

When bending the lead (A) at a right angle using the method described above, the lead (A) will expand due to springback after processing so that the bending point becomes a slightly obtuse angle. ) could not be bent at right angles.For this reason, in the past, the above method was used to bend the lead (A) at right angles.
After bending the lead (A) once, in the next process, the lead (A) is bent again by the amount of expansion caused by the springback, so that the bending point of the lead (A) will be exactly at a right angle.
The sea urchin is being corrected. But in this way lead (A)
When bending the lead (A), two steps are required to bend the lead (A), which makes the work complicated and the equipment 9 expensive.

A bending die for bending a sand pso L stage lead at right angles is made from a die with a tapered surface whose side surface is inclined so that the lead bending angle is an acute angle. a lower mold, a mold main body disposed above the lower mold so as to be able to rise and fall freely, an arm swingably supported below the mold main body and swingable by a driving means; A pad that is elastically supported and passes through an opening provided in the arm to position and fix the workpiece placed on the die, and for bending the workpiece placed on the die. , a punch fixed to the arm, and an upper mold.

After bending the lead of the workpiece, which is positioned and fixed on the path and die by a pad, with a punch at a right angle, the arm to which the punch is fixed is swung, and the lead follows the tapered surface formed on the side of the die. This method eliminates the bending defects caused by springback that occur in the past.

Figures 1 and 9JS2 show a press mold according to the present invention. In the figure, (1) is a lower mold consisting of a die plate (2) and a die (3) fixed on a die plate (2). The tapered surface (3a) is inclined at a predetermined acute angle with respect to the mounting surface of the unprocessed workpiece. (4) is an upper die which is arranged above the lower die (1) so as to be freely raised and lowered by a ram of a press machine. This upper mold (4) includes a mold body (5) connected to the ram and a bracket (5) fixed to the mold body (5).
6) is swingably held via a pin (7), and the die (3) is fixed to the arm (8).
A punch (9) for bending the lead (A) of the workpiece (C) placed on top passes through the opening (8a) provided in the arm (8), and the workpiece (C) is inserted into the die ( 3) a band (10) for positioning and fixing the arm (8); (11) is a hydraulic cylinder which is a driving means attached to the mold body (5) to swing the arm (8);
As this hydraulic cylinder (11) extends, the arm (8) swings clockwise in the figure, and the first stopper (12) provided on the arm (8) moves to the second stopper provided on the bracket (6). When it comes into contact with the stall/par (13), the arm (8
) remains horizontal, the cylinder (11) shortens, the arm (8) swings counterclockwise in the figure, and the tip of the stopper screw (14) screwed into the arm (8) reaches the mold body ( 5)
When the punch (9) comes into contact with the third stopper (S) provided on the arm (8), the side surface (9a) of the punch (9) fixed to the arm (8)
(3) along the tapered surface (3a). or,
A pad (10) passes through the opening (8a) of the arm (8).
) is connected via a connecting tube (17) to a spring (16) supported by the mold body (5) via an adjustment screw (15), and the pad (10) is attached to the mold body (5). Elastically supported. Also, (18) in the figure is the pad (10)
The guide loft (19) is a guide hole into which the guide rod (18) drilled in the die (3) fits, and the workpiece (C) is attached to the die (3) by the pad (10).
When positioning and fixing the pad (10), the guide rod (18) fits into the guide hole (19) to position the pad (10).

In the above configuration, in order to bend the lead (A) of the workpiece (C) using the bending die according to the present invention so that the bending point is accurately at right angles, first, the upper die (4) and the lower die are bent. (1)
The 0th order hydraulic cylinder (11) is set in the hydraulic press.
By extending the arm (8) and rotating the arm (8) slightly clockwise around the bottle (7), the first bar (12) is brought into contact with the second stopper (13). While keeping the arm (8) horizontal, set the workpiece (C) on the top of the die (3). In this state, the upper mold (4
) is lowered, first the pad (
10) presses the workpiece (C) placed on the die (3) to position and fix the workpiece (C) on the die (3). Next, the bunch (9) fixed to the arm (8) supported by the mold body (5) via the bracket (6) is moved to the workpiece (
Press the lead (A) of C) and insert the die (3) and punch (
9), the lead (A) is bent at right angles (first
When the lead (A) is bent at right angles in this way, the cylinder (11) is then shortened until the stopper screw (14) comes into contact with the third stopper (S). ) counterclockwise and insert the punch (9).
By not aligning the side surface (9a) of the lead (A) with the tapered surface (3a) of the die (3), the lead (A) is bent at an angle more acute than a right angle by the return amount due to springback. After that,
Extend the hydraulic cylinder (11), return the arm (8) to the horizontal position, raise the upper mold (4), and then take out the workpiece (C) from the die (3), and the bending point of the lead (A) will be A workpiece (C) that is accurately bent at right angles can be obtained.

As mentioned above, the present invention involves bending the lead of the workpiece, which is positioned and fixed on the die using a pad, at right angles using a punch, and then swinging the arm to which the punch is fixed, so that the lead is formed on the side of the die. Further bending was performed until the reeds were aligned with the tapered surface, so that even if the reeds were to spring bank, the bent points of the reeds would be at exactly right angles, so the reeds could be bent at right angles with a single press. This reduces the number of man-hours and equipment costs compared to conventional bending. Further, in the present invention, the bending angle can be easily changed by changing the inclination angle of the tapered surface of the die, so that bending of many types of leads can be performed using one mold.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a bending die according to the present invention, Fig. 2 is an enlarged sectional view showing the main parts of the bending die, and Fig. 3 is a state of a workpiece with leads connected by tie bars before bending. FIG. 4 is a perspective view showing the state of the work after bending. (1)--Lower mold, (3)-Die, (3a)-Tapered surface, (4)--Upper mold, (5)--Mold body, (8)--
Arm, (8a) - Opening part, (9) - Punch, (9a
) - Side of punch, (10) --- Pad, (11)
-Hydraulic cylinder, (16)・-Spring, (A)-・
-Lead, (CL-Work. Fig. 2 E7gJi Dame 4Ijl! Fig. 1, Yo/Bubi 1-! Bu7r8 Fig. 3 7-
Z

Claims (1)

[Claims] (1) A lower mold consisting of a die with a tapered side surface that is inclined so that the bending angle of the workpiece is an acute angle, a mold body that is arranged above the lower mold so that it can be raised and lowered, and a mold body that is arranged below the mold body. An arm that is swingably supported and swings by a driving means, and an arm that is elastically supported by the mold body via a spring, passes through an opening provided in the arm, and is placed on the die. A bending die comprising: a pad for positioning and fixing a work placed on the die; and a punch fixed to the arm for bending the work placed on the die.