JPS61154799A - Double c-frame press - Google Patents

Abstract

PURPOSE:To maintain the perpendicularity of a press slide and to maintain the parallelism of upper and lower dies by forming a frame into a double construction, guiding the press slide with the main frame and mounting a pressurizing mechanism to the inside frame. CONSTITUTION:A guide frame 7 which supports freely slidably the slide 6 is provided to the upper frame 3 of the main frame 1. The inside frame 8 is provided to the inside of the main frame 1. A die height adjusting mechanism 10 is provided to the upper part of the slide 6 and the 1st lever 18 is connected to the mechanism 10. The 2nd lever 21 is grasped by the 1st lever 18. The 1st air cylinder 31 is connected to the base end of the 1st lever 18. The 2nd air cylinder 34 attached to the inside frame 8 is coupled to the base part of the 2nd lever 21. The slide 6 existing at the top dead point is returned to the home position by the operation of the 1st lever 18 and the 2nd lever 21. The parallelism of the dies is maintained and the accuracy of the product is improved by such mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a press machine, and more particularly to a C-frame press with a double frame.

(Prior Art) The advantage of the C-shaped frame is that it is easy to work because the working part is positioned in the front and left and right directions, but it has the disadvantage that the frame deforms due to the work load. This deformation has two effects on the operation. The - is a horizontal component that disturbs the center line of the punch and die, and the second is a vertical component of deformation that increases the distance between the punch and die.
i8<, and the former disturbs the correct clearance between the punch and the die, which reduces work accuracy and accelerates mold wear. In addition, in the latter case, at the moment when the working pressure is removed from the punch during blanking work, the elastic energy of deformation accumulated in the frame and other parts causes the punch to rush into the die at a very rapid speed, causing the metal to die. This will adversely affect the life of the mold.

Conventionally, as a device to prevent the front opening phenomenon, which is a deformation of the C-shaped frame, the opening of the frame is tightened with a tie rod, or a cylinder is attached to the frame opening to open the frame.

There have been attempts to avoid the negative effects of the front-opening phenomenon. (-For example, French Patent No. 1440018) (Problem to be Solved by the Invention) How to use tie rods inside the frame.

This is not preferable because it greatly reduces the advantages of the C frame. Moreover, for a diameter that is normally used, its rigidity is much lower than that of a frame, so the effect of increasing rigidity is very small.Furthermore, the method of using cylinders in the frame also prevents the front opening phenomenon. Providing this to the frame may be effective in preventing excessive front opening, but as with tie rods, the advantage of the C frame will be reduced.

(Means for Solving the Problems) The present invention aims to prevent the front opening of a C-shaped frame press, and the frame has a double structure of a main frame and an inner frame, and the main frame The press slide is guided and a pressure mechanism is attached to the inner frame. This succeeded in maintaining the verticality of the press slide and the parallelism of the upper and lower molds, making precision punching possible.

(Function) The main frame on which the mold is attached and the inner frame on which the pressurizing mechanism is attached constitute an independent frame, and the main frame does not receive reaction force from the working load of the press, so it is placed in front of the mold attachment part. There is no opening phenomenon.

(Example) The example is a press equipped with a trouble mechanism and driven by air pressure, in which the main body frame l has a C-shaped side surface, and a lower frame 2, an upper frame 3, and a side frame. 4 are all integrally formed. lower frame 2
A bolster 5 is provided on which a lower die is placed, and a guide frame 7 is provided on the upper frame 3 to slidably support both sides of the slide 6.

The main body frame l is made up of two steel plates arranged side by side. An inner frame 8 is provided inside the main body frame 1, and the inner frame 8 is also made of two steel plates arranged side by side, and the two are joined near the lower end of the bed 2.

Note that the inner frames 8 are connected to each other by a plurality of connecting rods 9 that are pivoted in the horizontal direction.

A die-hide adjustment mechanism 1O is provided at the upper part of the slide 6, and this adjustment mechanism includes a lower adjustment body 12. It consists of an adjustment nut 13 having screw shafts 14 and 15 on the upper and lower sides, and an upper adjustment body 1B having a bearing portion 17. be screwed on. As will be described later, the upper adjustment body 16 is connected to other links so that it does not move independently.
When you turn the adjustment knob) 13, only the slider 6 moves,
Dihide adjustments are made.

Furthermore, the upper adjustment body 1B of the die-hide adjustment mechanism 10
The tip of the bent portion 19 of the first louver 18 formed in the type 1 is rotatably connected to the bearing portion 17 provided in the bearing portion 17 by a pivot shaft 20, and the base portion of the first louver 18 is connected to the bearing portion 17 provided at the rear side of the slide mounting portion. It extends toward the center of the frame.

Further, a second lever 21 is provided to be held between the first lever 18 and connected to the pressure frame 8 located above the pivot shaft 20 by a support shaft 22, and the tip thereof is connected to the bent portion of the first lever 18. They are connected by a connecting shaft 23, and the second lever 21
The base extends further toward the rear of the hood than the first lever 18.

A piston rod 32 of a first air cylinder 31 having a mounting base 30 fixed to the inner frame 8 is connected to the base end of the first lever 18, and a piston rod 32 of a first air cylinder 31 having a mounting base 30 fixed to the inner frame 8 is connected to the base of the second lever 21. A piston rod 35 of a second air cylinder 34 provided on an axially mounted mounting shaft 33 is coupled.

Although the mold is omitted in the drawing, the lowering of the slide until the mold comes into contact is performed by driving the first air cylinder 31 and the louver 18, and the pressing operation near the bottom dead center is performed by the second air cylinder 34. Therefore, the first air cylinder 31 may have a smaller diameter than the second air cylinder 34, making it an energy-saving type.

Figure 1 is 1. The piston rods 32, 35 of the second air cylinders 31, 34 are moving forward, and the slide represents when the bottom dead center is reached. After passing the bottom dead center, the second air cylinder 34 is driven and the piston rod 35
is moved backward (pulled down), the second lever 21 is rotated clockwise about the support shaft 22, and the tip of the second lever 21 is rotated counterclockwise to close the bent portion 18. of the second lever 18. The die-hide adjustment mechanism IO raises the slide 6 to separate the mold and the pressurized material.Next, when the piston rod 32 is retreated by the drive of the first air cylinder 31, the connecting shaft 23
Rotate clockwise around the center.

As mentioned above, since the lever 18 rotates around the support shaft 22 and stops, the second lever 18 can rotate around the connecting shaft 23, and thereby the bending portion 19 Rotate counterclockwise to raise the slide 6 while tilting the die-hide adjustment mechanism 10.

Then, at the position where slide 6 has reached the top dead center, lever 1 is activated, and then lever 2! is operated to return the slide 6 to the position shown, and these operations are repeated to perform the pressing operation.

In the embodiment, a press with a trouble mechanism has been described, but the present invention can also be applied to a mechanical press with a crank mechanism without any modification.

(Effect of the invention) The slide is guided by the main body frame, and the pressure device installed at the top of the slide is attached to the inner frame, so the front opening phenomenon of the frame due to the work load on the main body frame on which the mold is mounted is prevented. This allows work to be done while maintaining the parallelism of the mold.

This has the effect of improving product precision and extending the life of the mold.

[Brief explanation of the drawing]

FIG. 1 is a side view of the entire assembly, and FIG. 2 is a front view of the same. ■...Body frame 2...Lower frame 3...
...Top frame 4...Side frame 5...
Bolster 6...Slide 7...Guide frame 8...Inner frame 9...Connecting rod
10... Diehide adjustment mechanism 11... Bin
12...Lower adjustment body 13...Adjusting nut 14...Screw shaft 15...Screw shaft 16
... Upper adjustment body 17 ... Bearing part 18.
...Second lever 18...Bending part 20...
・Pivot 21...Second lever 22...Spindle 2
3...Connection shaft 30...Mounting stand 31...
・Ml air cylinder 32...Piston rod 33・
...Mounting shaft 34...Second air cylinder 3
5... Piston rod

Claims (1)

[Claims] The main body frame has a C-shaped side surface and an inner frame provided inside the main body frame, and a slide is slidably supported on the upper frame of the main body frame, and a driving part of a pressure mechanism that drives the slide is provided. A double frame C-type press, characterized in that it is attached to the inner frame.