JPH0788700A - Transfer press device - Google Patents

Abstract

PURPOSE:To provide a transfer press device, the initial cost per an article of which is inexpensive. CONSTITUTION:Plural hydraulic cylinders C1 to C5 are arranged against the upper side frame 2 of a transfer press, dies are attached on these respective hydraulic cylinders C1 to C5, these respective hydraulic cylinders C1 to C5 are controlled by setting a time difference, and then the max. loads generating during pressing are made so as to be not lapped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer press apparatus for mounting a plurality of molds and performing multi-step processing.

[0002]

2. Description of the Related Art In order to process a product having a complicated shape, multi-step press working is necessary. That is, a plurality of molds are required to complete one component having a complicated shape from the material. Conventionally, in such a case, each process is processed by a single press and manually transported to the next process. However, as labor costs have risen in recent years, labor saving and labor saving have been required, and as a result, expensive transfer press devices have been adopted as automated presses. In this transfer press machine, a plurality of molds are simultaneously pressed and processed, and the transfer machine simultaneously moves them to the molds of the next process, which enables high-speed operation (10 to 50 pieces per minute),
In addition, since the machine can be operated unmanned, there is a great cost merit that the processing cost (running cost) per unit is reduced.

FIG. 2 shows an example of a conventional transfer press apparatus. In the figure, 1 is a lower plate, 2 is an upper plate, 3 is a tie rod connecting the lower plate 1 and the upper plate 2, 4 is a bolster mounted on the lower plate 1, 5 is a ram which is opposed to the bolster 4 and is vertically movable along the tie rod 3, 6 is an upper plate 2 for driving the ram 5, the lower end of the cylinder Is a hydraulic cylinder fixed to, and 6a is its piston rod.

[0004]

[Problems to be Solved by the Invention] With the current overflow of products in the market and diversification of consumption, production lots are required to be manufactured in small lots with a large variety of products in small quantities. The number of products that can be produced in one die change has decreased, and the frequency of die changes has increased.
Since the die replacement time is a non-production time, if this die replacement is frequent, the operation rate of the press is lowered, the burden of the initial cost per piece is increased, and the production cost is increased. As an improvement measure, various techniques, such as an automatic die changer, have been developed in order to shorten the die change. However, although these technologies have an effect, they further increase the initial cost, make the entire equipment expensive, and are too expensive equipment to be called a transfer press apparatus suitable for high-mix low-volume production. .

[0005]

In order to solve the above problems, in the present invention, a plurality of hydraulic cylinders are arranged on a frame of a transfer press, and a mold is attached to each of these hydraulic cylinders. By controlling each hydraulic cylinder with a time lag, the transfer press device is configured so that the maximum loads generated during press working do not overlap.

[0006]

In a normal transfer press, a large number of molds are attached to one plate, so that the molds can be processed only at the same time. However, in the present invention, a plurality of molds are fixed to different hydraulic cylinders. Therefore, it is possible to perform press processing with a time difference. Therefore, according to the present invention, although the processing time becomes slightly longer, the maximum load may be designed by considering the maximum load of one hydraulic cylinder.
Since the weight of the frame can be significantly reduced, it is possible to provide a very inexpensive transfer press device as compared with the conventional transfer press. That is, the present invention reduces the initial cost per product by significantly reducing the weight of the transfer press device even if the number of products required to speed up the transfer press device is reduced to reduce the number of products to be manufactured. is there.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the device of the present invention will be described below with reference to FIG. In the figure, the same symbols as the above-mentioned symbols indicate the same items. That is, 1 is a lower plate, 2 is an upper plate, and 3 is a tie rod that connects the lower plate 1 and the upper plate 2.

In this embodiment, a plurality (five in this embodiment) of bolsters B ₁ , B ₂ , B ₃ , B ₄ , B ₅ are arranged at equal intervals on the lower plate 1 of the transfer press. , provided an upper plate 2 to each bolster B ₁ .about.B ₅ and the opposing hydraulic cylinder C _{1 for, C 2, C 3, C} 4, C 5 immediately above the respective bolster B ₁ .about.B ₅ vertically, these Rams R _{1 to} R ₅ are provided at the lower ends of the piston rods C _{1a to} C _5a of the hydraulic cylinders C _{1 to} C ₅ , respectively.
A mold (not shown) for each step is attached to each of the bolsters B _{1 to} B ₅ and each of the rams R _{1 to} R ₅ , and these hydraulic cylinders C _{1 to} C ₅ are controlled with a time difference. This prevents the maximum loads generated during press working from overlapping.

[0009]

As described above, according to the present invention, the following effects can be obtained. (1) It becomes an inexpensive transfer press device. Since there is no hydraulic cylinder driven at the same time, and the pump and motor need only have the capacity of one hydraulic cylinder, it is possible to reduce the size. Similarly, the frames 1 and 2 only have to withstand the maximum pressure of one hydraulic cylinder, so that the weight can be significantly reduced. Therefore, it is possible to supply an inexpensive transfer press device which is a fraction of that of the conventional device. (2) Mold adjustment becomes easy. In the conventional transfer press, it is difficult to adjust the bottom dead center because the molds for multiple steps are pressed at the same time.
In the press of the present invention, since each bottom dead center can be controlled independently, the degree of freedom is increased and the adjustment and the like are facilitated. (3) The degree of freedom of the installation place increases. Since the frame strength of the device of the present invention may be lower than that of the conventional device, the device can be made smaller and lighter to save weight and save space. In addition, the reduction in the processing speed has the advantage that it leads to low noise and low vibration, and the speed difference with the assembly production line is reduced. The equipment can be manufactured at low cost because the equipment is cheap. That is, it is possible to install the pressing device at the most suitable place in the assembly line.

[Brief description of drawings]

FIG. 1 is a perspective view of a device of the present invention.

FIG. 2 is a perspective view of a conventional device.

[Explanation of symbols]

1 Lower Plate 2 Upper Plate 3 Tie Rod 4 Bolster 5 Ram 6 Hydraulic Cylinder 6a Piston Rod B ₁ ~ B ₅ Bolster C ₁ ~ C ₅ Hydraulic Cylinder C _1a ~ C _5a Piston Rod R ₁ ~ R ₅ Ram

Claims (1)

[Claims] 1. A press working by arranging a plurality of hydraulic cylinders with respect to a frame of a transfer press, attaching a mold to each of these hydraulic cylinders, and controlling each of these hydraulic cylinders with a time difference. A transfer press device characterized in that the maximum loads generated at times do not overlap.