JPH0586300B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a bending die for bending a lead used for a connector pin or the like of a connector at right angles.

BACKGROUND OF THE INVENTION Recently, connector pins of connectors are sometimes made by bending straight leads at right angles. This lead bending process is performed by placing a workpiece C, which is made up of a predetermined number of leads A connected by tie bars B as shown in FIG. 3, on a die set in a press machine.
After positioning and fixing the lead A on the die, by lowering the punch located above the die,
was bent at right angles as shown in Figure 4.

Problems to be Solved by the Invention When the lead A is bent at a right angle using the method described above, the lead A widens out at a slightly obtuse angle due to springback after processing, and the lead It was not possible to bend the bend point A at right angles. For this reason, in the past, after the lead A was once bent using the above method, the lead A was bent by the amount of expansion due to spring back in the next process.
By bending the lead A again, the bent part of the lead A is corrected so that it is exactly at a right angle. However, when lead A is bent in this manner, there are problems in that two steps are required to bend lead A, which makes the work complicated and increases equipment costs.

Means for Solving the Problem A bending die for bending the lead at right angles is provided with a lower die consisting of a die with a tapered side surface that is inclined so that the lead bending angle is acute.
A mold body is arranged above the lower mold so as to be able to rise and fall freely, an arm is swingably supported below the mold body and swings by a driving means, and an arm is elastically connected to the mold body via a spring. A pad that is supported and passes through an opening provided in the arm to position and fix the workpiece placed on the die, and a pad that is fixed to the arm for bending the workpiece placed on the die. The punch is made up of a punch and an upper die.

Function: After bending the lead of the workpiece, which is positioned and fixed on the die with a pad, at a right angle using a punch, the arm to which the punch is fixed is swung, and the lead is aligned with the tapered surface formed on the side of the die. Further bending is performed until the material is aligned, eliminating the bending defects caused by spring back that conventionally occur.

Embodiment FIGS. 1 and 2 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 the die plate 2. As shown in the figure, the side surface of the die 3 is at a predetermined acute angle with respect to the surface on which the workpiece to be processed is placed on the die 3. It has an inclined taper surface 3a. Reference numeral 4 denotes 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 die 4 has a die body 5 connected to the ram, an arm 8 which is swingably held by a bracket 6 fixed to the die body 5 via a pin 7, and is fixed to the arm 8, and is fixed to the die 3. Punch 9 for bending lead A of workpiece C placed on
and a pad 10 that passes through an opening 8a provided in the arm 8 and positions and fixes the workpiece C on the die 3. Reference numeral 11 denotes a hydraulic cylinder which is a driving means attached to the mold body 5 to swing the arm 8. When this hydraulic cylinder 11 extends, the arm 8 swings clockwise in the figure.
When the first stopper 12 provided on the arm 8 comes into contact with the second stopper 13 provided on the bracket 6, the arm 8 remains in a horizontal state. Also cylinder 11
is shortened, arm 8 swings counterclockwise in the figure,
When the tip of the stopper screw 14 screwed onto the arm 8 comes into contact with the third stopper S provided on the mold body 5, the side surface 9a of the punch 9 fixed to the arm 8 aligns with the tapered surface 3a of the die 3. . or,
The pad 10 passing through the opening 8a of the arm 8 is
The pad 10 is connected to a spring 16 supported by the mold body 5 via an adjustment screw 15 through a connecting tube 17, and the pad 10 is elastically supported by the mold body 5. In the figure, 18 is a guide rod attached to the pad 10, and 19 is a guide hole into which the guide rod 18 drilled in the die 3 fits. When the workpiece C is positioned and fixed on the die 3 by the pad 10, the guide rod 18 By fitting into the guide hole 19, the pad 10 is positioned.

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 1 are set in a hydraulic press. do. Next, extend the hydraulic cylinder 11 and move the arm 8 around the pin 7.
By slightly rotating the arm 8 clockwise to bring the first stopper 12 into contact with the second stopper 13, the workpiece C is set on the upper surface of the die 3 while keeping the arm 8 in a horizontal state. When the upper die 4 is lowered in this state, the pad 10 elastically supported by the die body 5 of the upper die 4 via the spring 16 presses against the workpiece C placed on the die 3.
Workpiece C is positioned and fixed on die 3. Next, a punch 9 fixed to an arm 8 supported by the mold body 5 via a bracket 6 presses the lead A of the workpiece C, and the lead A is bent at a right angle by the die 3 and the punch 9 (first condition). When the lead A is bent at right angles in this way, the cylinder 11 is then shortened, the arm 8 is rotated counterclockwise until the stopper screw 14 comes into contact with the third stopper S, and the side surface 9a of the punch 9 is By extending the lead A along the tapered surface 3a of the die 3, the lead A is bent at an angle more acute than a right angle by the amount of return caused by the spring back. After that, the hydraulic cylinder 11 is extended, the arm 8 is returned to the horizontal state, the upper mold 4 is raised, and the workpiece C is taken out from the die 3.
It is possible to obtain a workpiece C whose bent portions are precisely bent at right angles.

Effects of the Invention As described above, the present invention bends the lead of a workpiece positioned and fixed on the die with a pad at right angles using a punch, and then swings the arm to which the punch is fixed, so that the lead is placed on the side of the die. Further bending was performed until the lead was bent along the tapered surface formed on the lead, so that even if the lead caused springback, the bending point of the lead would be at an accurate right angle. It can be bent at right angles, reducing the number of man-hours and equipment costs compared to conventional bending. Furthermore, 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 the drawing]

FIG. 1 is a sectional view of a bending die according to the present invention, and FIG.
The figure is an enlarged cross-sectional view showing the main parts of the bending die, Figure 3 is a perspective view of a workpiece with leads connected by tie bars before bending, and Figure 4 is a view of the workpiece after bending. It is a perspective view showing a state. 1...lower mold, 3...die, 3a...tapered surface,
4...Upper mold, 5...Mold body, 8...Arm, 8a
...Opening part, 9...Punch, 9a...Side surface of punch, 10...Pad, 11...Hydraulic cylinder, 1
6...Spring, A...Lead, C...Work.

Claims (1)

[Claims] 1. A lower die consisting of a die with a tapered side surface that is inclined to make the bending angle of the workpiece an acute angle, a die body that is arranged above the lower die so as to be able to rise and fall freely, and a die that swings below the die body. freely supported, and
An arm that swings by a driving means and an arm that is elastically supported by the mold body via a spring and that passes through an opening provided in the arm to position and fix the workpiece placed on the die. 1. A bending die comprising: a pad for bending; and an upper die consisting of a punch fixed to the arm for bending a workpiece placed on the die.