JPH06122033A - Method and press die for pressing parallel portions of round bar - Google Patents

Abstract

PURPOSE:To miniaturize and lighten a press die or pressing. CONSTITUTION:Each end part 3a, 3b of U shaped round bar 3 is abutted on each surface of upper and lower of a floating die 16 supported with springs 17, 18 and set. When an upper die 20 is lowered, a punch 19 of the upper die pushes down the floating die 16 through the end part 3a resisting to the springs 17, 18. Further, when the upper die is lowered more, one side end part 3a pressed with the upper surface of the floating die 16 and the punch 19, and the other side end part 3b is pressed with the down surface of the floating die 16 and the punch 15, respectively simultaneously.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working method for simultaneously crushing parallel portions of a U-shaped round bar, such as both legs of the U-shaped round bar, and a press die used therefor.

[0002]

2. Description of the Related Art For crushing both parallel parts of a round bar, such as the legs of a U-shaped round bar, by lowering a punch in a plane including the parallel parts, as shown in FIG. , One end 3a of the round bar 3 is placed on the upper surface of the die 2 fixed to the lower mold 1, and the other end 3b of the round bar 3 is inserted into the escape hole 4, and the punch 5 fixed to the upper mold is lowered. First, the end 3a is crushed.

After the stroke for crushing the one end 3a is completed, the positions of both leg portions 3a and 3b are exchanged,
In the second stroke, the other end 3b was crushed by the die 2 and the punch 5 in two strokes.

However, according to this method, the U-shaped round bar must be crushed one by one, which requires a large number of processing steps.
There were drawbacks such as the lack of parallelism between the two crushed surfaces. Therefore, the cam method shown in FIGS. 6 and 7 is widely used instead of the method shown in FIG.

In this cam system, one end 3a and the other end 3b of a U-shaped round bar are applied to the left and right sides of a die 6 fixed to the lower die,
When the upper die is lowered, the upper drive cams 7 and 8 slide the lower slide cams 9 and 10 in the left and right directions to press the punches 11 and 12 against the work (one end 3a and the other end 3b). Both legs 3a and 3b are crushed and processed at the same time.

Reference numerals 13 and 14 are springs for returning the slide cams 9 and 10. In this cam system, U
Both ends of the work piece are machined at the same time by arranging both legs of the character-shaped round bar in a horizontal plane perpendicular to the upper and lower pressing directions and converting the pressing load in the vertical direction to the left and right with a slide cam.

[0007]

In the above-mentioned cam method, it is necessary to change the press load direction, and moreover, in the crushing work of the round bar, the work area per work area is larger than that in the general punching / bending press work. Since the required load becomes large, there is a problem that the mold structure is complicated and the size becomes large.

Therefore, an object of the present invention is to provide a method for simultaneously crushing two parallel portions of a round bar capable of solving such a problem, and a press die used therefor.

[0009]

In order to achieve the above object, a method of simultaneously crushing parallel portions of a round rod in the present invention is a method of crushing two parallel portions (3a) (3) of a round rod (3).
Apply b) to the upper and lower surfaces of the floating die (16),
From there, lower the punch (19) in the pressing direction,
Press on the lower punch (15) and both parallel parts (3a)
It is characterized in that (3b) is crushed and processed at the same time.

The press die used for carrying out the crushing method is a floating die (16) mounted on the lower die so as to be vertically movable via springs (17, 18).
And a lower die crushing punch (15) attached to the lower die, which is arranged below the floating die (16), and an upper die crushing punch (19) attached to the upper die.

[0011]

[Function] When the upper and lower surfaces of the floating die (16) are contacted with the parallel portions of the round bar and the upper die is lowered, the upper die crushing punch (19) sandwiches the round bar and lowers the floating die together. Press on the lower mold. Thus, one of the parallel portions of the round bar is crushed by the upper die crushing punch (19) and the floating die, and the other parallel portion is sandwiched by the lower die crushing punch (15) and the floating die.

When the upper die is raised, the floating die is returned by the springs (17, 18) and the work can be taken out. In this way, both parts of the work are crushed in parallel.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, 1 is a lower die, 15 is a lower die crushing punch attached to the lower die 1, 16 is a floating die attached to the lower die 1 by compression springs 17 and 18, and the whole is approximately U.
Contact surfaces for contacting both ends 3a, 3b of the parallel portion of the character-shaped round bar 3 are formed above and below the contact surface.

Reference numeral 19 denotes an upper die crushing punch attached to the upper die 20. Both ends 3a and 3b are set on the upper and lower abutting surfaces of the floating die 16 so that the parallel legs of the U-shaped round bar are located in the vertical plane, and when the upper die is lowered, the end 3
a is crushed by the floating dies 16 and the upper die crushing punch 19 and the floating die 16, and at the same time, the other end 3b is processed by the floating die 16 and the lower die crushing punch 15.
Is crushed and processed.

FIG. 1 shows a state in which the upper die is returned to the upper side after being crushed in this way and is in an open state.
The shape after the one end portion 3a of FIG. FIG. 2 shows the shape of the product obtained by crushing both ends of the round bar 3 in this way by pressing in a plane including two parallel legs and in a direction perpendicular to both legs. The round bar 3 in this figure is not a complete U-shape, but its base 3c is bent into an L-shape when viewed from above, but parallel legs 3d and 3e are in a plane including both legs 3d and 3e. And it will be understood that the method and press die of the present invention are useful when crushing in a direction perpendicular to both legs.

FIGS. 3 and 4 show a second embodiment of the press die of the present invention. FIG. 3 shows a die open state and FIG. 4 shows a die close aspect. In both figures, 1 is a lower die, 15 is a lower die crushing punch attached to the lower die 1, and 16 is a floating die, which is attached to the lower die 1 by guide posts 17A, 18A and compression springs 17, 18.

The floating die 16 is composed of a horizontal floating plate 16a, a base 16b fixed to the floating plate, and a first die 16c and a second die 16d mounted above and below the base 16b. ing.

Reference numeral 19 denotes an upper die crushing punch attached to the upper die 20. Both ends 3a and 3b of the U-shaped round bar 3 are set against the upper surface of the first die 16c and the lower surface of the second die 16d as shown in FIG.
a and 3b are crushed in parallel as shown in FIG. 4 to form the shape shown in FIG.

[0019]

According to the present invention, it is possible to easily obtain parallelism in processing of both parts, and further, it is possible to reduce the weight of the mold, and to facilitate the mold storage space and maintenance.

[Brief description of drawings]

FIG. 1 is a schematic perspective view illustrating a crushing method and a press die of the present invention.

FIG. 2 is an enlarged perspective view of a work crushed by the present invention.

FIG. 3 is a partially longitudinal front view showing a mode when the mold is opened in the second embodiment of the press mold of the present invention.

FIG. 4 is a partial vertical cross-sectional view showing an aspect of the embodiment of FIG. 3 when the mold is closed.

FIG. 5 is a perspective view showing an example of a conventional technique.

FIG. 6 is a front view showing another example of the prior art, showing a mode when the mold is opened.

FIG. 7 shows a state of the prior art mold of FIG. 6 when the mold is closed.

[Explanation of symbols]

 3 Round bar 3a, 3b Parallel part (end part) 15,19 Punch 16 Floating die 17,18 Spring

Claims (2)

[Claims] 1. Two parallel parts (3a) of a round bar (3)
(3b) is applied to each of the upper and lower surfaces of the floating die (16), the punch (19) is lowered in the pressing direction from above, and the punch (15) below is pressed against both parallel portions (3).
a) A method for simultaneously crushing parallel portions of a round bar, characterized by simultaneously crushing (3b). 2. A floating die (1) mounted on a lower die so as to be vertically movable via springs (17, 18).
6), a lower die crushing punch (15) attached to a lower die disposed below the floating die (16), and an upper die crushing punch (19) attached to the upper die. A press die that simultaneously crushes the parallel parts of the round bar.