JPS6037195Y2 - press machine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a descending type press machine powered by a cylinder.

Conventional presses use multiple double-acting cylinders to move the pressure plate and upper die up and down.

However, for example, when the ram is pulled back, an imbalance in the operation of each double-acting cylinder may cause lateral vibration of the upper mold or the pressure plate, which impairs the mechanical precision of the press.

In addition, when pulling back multiple double-acting cylinders, it is difficult to quickly pull back the ram, and there are also problems in terms of work efficiency and cost.

Therefore, the present invention solves the above-mentioned drawbacks of the conventional method. Among multiple cylinders, the cylinder located in the center is made double-acting, and the other cylinders are made single-acting, so that the press machine when pulling back the ram The purpose of the present invention is to provide a press machine that eliminates lateral runout and prevents a decrease in machine accuracy.

Embodiments of the present invention will be described in detail below with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a pair of frames erected on the left and right sides, and a pedestal 2 is fixed to the lower front surfaces of the frames 1, 1.

A lower mold bed 3 is horizontally attached to the upper surface of the pedestal 2, and a lower mold 4 is provided on the upper surface.

On the other hand, in the illustrated example, three hydraulic cylinders 6a, 6b, and 6c are arranged and fixed in parallel on the upper front surfaces of the frames 1, 1, sandwiched between two guide plates 5, 5.

The hydraulic cylinder 6a located in the center is a double-acting cylinder in which the advancing and retracting of the ram 7a is driven and operated.

In addition, the two hydraulic cylinders 6b and 6c on the left and right are the rams 7b.
, 7c is a single-acting type cylinder in which only the advancing direction is operated.

Moreover, the central hydraulic cylinder 6a is connected to the other hydraulic cylinders 6.
It has a larger press capacity than B and 6C.

Each of the hydraulic cylinders 6 at 6 b and 6 c has a pressure plate 8 fixedly installed across the lower end of each of the rams 7 a and 7 bv 7 c, and the pressure plate has a central portion 8 a that is slightly inflated.

An upper mold 9 is attached to the lower surface of the pressure plate 8, facing the lower mold 4, together with a retaining plate 10 via screws (not shown).

Note that the center portion 9a of the upper die 9 is also slightly bulged due to the bulge of the pressure plate 8.

Therefore, the upper mold 9 applies equal press pressure to both ends and the center of the workpiece.

Also, on the back side of the pressure plate 8 (right side in Figure 2) is an arm 1.
A roller 12 is rotatably supported through the frame 1, and the roller is attached to the frames 1, 1 and is in contact with the idle rail 13.

As a result, the rams 7a to 7c of the hydraulic cylinders 6a to 6C
The pressure plate 8 moves up and down as the roller 1 moves up and down.
2 can be guided by the guide rail 13 and moved.

Further, adjustment screws 14 and 14 for regulating the lowering limit position of the upper mold 9 are provided upright on the upper surface of both left and right ends of the lower mold bed 3.

When the upper die 9 is lowered, the processing plate 8 comes into contact with the adjustment screw 14.14, so that the lowering limit position, that is, the bottom dead center can be regulated.

Next, to explain the operation, each hydraulic cylinder 6a
, 6bt 6c are operated simultaneously to each ram 7a, ?
When be 7 c is stretched, the upper die 9 is lowered, and together with the lower die 4, the workpiece is pressed.

When the upper mold 9 is raised after pressing, the double-acting central hydraulic cylinder 6a is activated, and the ram 7a is pulled back. pulled back together.

In other words, when pressing, three hydraulic cylinders 6at
A powerful press can be performed by the driving force of 6b and 6c, and when the ram is pulled back, the ram 7a of only the double-acting cylinder 6a rises, and the ram 7b of the other two single-acting cylinders 6b and 6c is lifted.
,? c is driven and pulled back at the same time.

Therefore, the upper mold 9 can be quickly raised in a horizontal state.

In addition, in order to improve the processing accuracy of the product, the press machine of the present invention has the center part 9a of the upper mold 9 slightly inflated, and the press capacity of the center cylinder 6a is made larger than the other cylinders 6by6c. It is possible to further improve the processing accuracy of the product.

As described above, according to the press machine of the present invention, the central cylinder is double-acting and the other cylinders are single-acting, which eliminates the lateral vibration of the press when the ram is pulled back, which reduces machine precision. can be prevented.

In addition, since the ram is pulled back using one cylinder, the ram can be returned quickly, improving press work efficiency and reducing the cost of cylinder equipment.

Further, by making the pressing capacity of the cylinder located in the center larger than that of the other cylinders, the processing and bending capacity and accuracy can be improved.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of the press machine of the present invention, and FIG. 2 is an enlarged sectional view taken along the line ■-■ in FIG. 4...Lower mold, 6a...Double acting cylinder, 6b, 6c...Single acting cylinder 7
a, 7b. 7c...Ram, 9...Upper mold.

Claims (1)

[Scope of utility model registration request] There are multiple cylinders in the center and sides of the frame that raise and lower the upper mold, with one cylinder located in the center being double-acting and the other cylinders being single-acting. A press machine characterized in that the above-mentioned double-acting cylinder has a press capacity greater than that of other cylinders.