GB2067111A

GB2067111A - Swaging press

Info

Publication number: GB2067111A
Application number: GB8001467A
Authority: GB
Original assignee: URAL Z TYAZHEL MASHINOSTR IM S
Current assignee: URAL Z TYAZHEL MASHINOSTR IM S
Priority date: 1980-01-16
Filing date: 1980-01-16
Publication date: 1981-07-22
Also published as: GB2067111B; DE3002039A1

Abstract

A vertical hydraulic swaging press comprises a baseplate (1) supporting a table (10) for receiving a workpiece and a working cylinder (5) having its bottom wall facing the table. The baseplate is an allcast frame pre-stressed by tie rods (2) in the form of through columns supporting an auxiliary cross-piece (3) located above the baseplate, the auxiliary cross-piece carrying return stroke cylinders (9) and a piston (4) of the working cyclinder. The working cylinder is rigidly connected to a bolster (6) which is mounted for movement in the baseplate. The construction permits an increase in the height of the working space without any increase in the total height of the press, and with improved press rigidity. <IMAGE>

Description

SPECIFICATION Swaging press The present invention relates to a swaging press, and more particularly to a vertical hydraulic swaging press to be used for swaging of various workpieces such as multicavity workpieces requiring the provision of four or more piercing systems.

Various types of presses for similar purposes are known. They include a vertical hydraulic press as disclosed in USSR Inventor's Certificate No. 341,290. This press comprises a frame taking up the working force of the press and consisting of top and bottom stationary crossheads which are secured by columns, hydraulic wbrking and return stroke cylinders having pistons for moving a movable traverse, and tooi assemblies mounted on a lower movable cross-piece and on the movable traverse. The movable cross-piece and the working cylinders are arranged below an upper movable cross-piece which is provided with at least one additional stationary crosspiece secured to the upper stationary crosspiece by tie rods and connected to the support members of the working cylinders.The pistons of the working cylinders co-operate with the movable traverse which is provided with a ram moving in guides of the upper movable cross-piece. In addition, the movable traverse and the working cylinders are arranged under the lower stationary cross-piece which is provided with at least one additional stationary cross-piece secured to the lower stationary cross-piece by tie rods and connected to support members of the working cylinders having their pistons co-operating with the movable traverse, the movable traverse being provided with a ram moving in guides of the lower stationary cross-piece.

There is also known a vertical hydraulic press as disclosed in USSR Patent Application No. 2,330,890/27/029132 dependent on USSR Inventor's Certificate No. 341,290, which comprises horizontal piercing systems and spacers secured by means of columns between a stationary plate and lower crosspiece, the columns tying up the spacers being arranged at 45D to the axis of symmetry of the table, and the horizontal piercing systems being mounted on the spacers.

There is further known a vertical hydraulic press as disclosed in British Patent Specification No. 940871, which comprises a baseplate, an intermediate traverse and an architrave interconnected by columns. A piston of a working cylinder of square section is secured to the architrave, and the cylinder is coupled to a die bed and is installed with its bottom wall down to function as a ram moving along the intermediate traverse. Return stroke cylinders are installed in the intermediate traverse, and their pistons are coupled to the working cylinder.

However, this known press has the following disadvantages: 1 . . Insufficient rigidity of the press.

2. . The square-section cylinder is compli cated to manufacture, and the accuracy of manufacture thereof is worse than that of a round cylinder since its edges are stress concentrators.

3.. An increase in the dimensions of the cylinder due to high pressure water sup ply during operation requires greater clearances in guides, thus reducing the accuracy of guiding and hence the accu racy of swaging.

The present invention provides a vertical hydraulic swaging press comprising a baseplate supporting a table for receiving a workpiece and a working cylinder having its bottom wall facing the table, wherein the baseplate is an all-cast frame prestressed by tie rods in the form of through columns supporting an auxiliary cross-piece located above the baseplate, the auxiliary cross-piece carrying return stroke cylinders and a piston of the working cylinder, the working cylinder being rigidly connected to a bolster which is mounted for directive movement in the baseplate frame.

This construction permits an increase in the height of the working space without any increase in the total height of the press, and the frame of a press for forces up to several thousand tons may be made as an all-cast structure thus reducing the amount of metal required for the manufacture of the press and improving its rigidity.

The uprights of the baseplate frame may be suitably provided with vertical guides for the bolster and wedges for adjusting the amount of clearance of the bolster relative to the guides.

This construction makes it possible to minimize misalignment of the movable bolster relative to a low die which, in turn, makes it possible to dispense with any additional aligning systems. It also reduces the amount of metal required for the manufacture of the press.

The invention will be further described, by way of example only, with reference to the accompanying drawings, in which: Figure 1 is a general side view, partly in section, of one embodiment of a swaging press according to the invention; and Figure 2 is a sectional view taken along the line Il-Il in Fig. 1.

The drawings show a vertical hydraulic swaging press which comprises a baseplate 1 in the form of an all-cast frame which is prestressed by tie rods 2 in the form of vertical through columns. An auxiliary cross-piece 3 is mounted at the top of the frame on extensions of the tie rods 2 and supports a piston 4 of a working cylinder 5 of circular cross-section.

The working cylinder 5 has its bottom wall facing down and is arranged in a bore of the upper deck of the baseplate 1. The working cylinder 5 is rigidly connected by its bottom wall to a bolster 6 having guides 7 which are adjustable by means of wedges, the bolster being guided in vertical uprights of the baseplate 1. An upper ejector 8 is installed in a bore of the bolster 6. Return stroke cylinders 9 are installed in the auxiliary cross-piece 3 and their pistons are connected to a flange of the working cylinder. A movable table 10 is mounted on the lower deck of the baseplate 1, and a lower piercing system 11 is secured to the lower butt end of the baseplate.

The press described above functions in the following manner.

A lower die (not shown) containing a workpiece is installed on the movable table 10, and the lower die is fed to the press axis by moving the table.

Upon feeding low pressure working fluid to the working cylinder 5, an upper die (not shown) attached to the bolster 6 is lowered until it contacts the workpiece. Then high pressure working fluid is fed to the working cylinder 5 to deform the workpiece. After the swaging is over, the working cylinder 5 with the bolster 6 and upper die is lifted by the return stroke cylinders 9 back to the initial position, and the lower die containing a swaged product is withdrawn from the press by moving the table 1 0.

Four lateral piercing systems may be installed on the uprights of the baseplate 1 of the press according to the invention. This makes it possible to swage multicavity parts of intricate configuration.

The use of the invention enables the height of the working space to be increased by about 12% without any increase in the total height of the press and permits the rigidity of the press to be increased by 15-20%. In addition, as mentioned above, the press according to the invention can be provided with lateral piercing systems thus making it possible to swage multicavity parts of intricate configuration.

Claims

1. A. vertical hydraulic swaging press comprising a baseplate supporting a table for receiving a workpiece and a working cylinder having its bottom wall facing the table, wherein the baseplate is an all-cast frame prestressed by tie rods in the form of through columns supporting an auxiliary cross-piece located above the baseplate, the auxiliary cross-piece carrying return stroke cylinders and a piston of the working cylinder, the working cylinder being rigidly connected to a bolster which is mounted for directive movement in the baseplate frame.

2. A vertical hydraulic swaging press as claimed in Claim 1, wherein uprights of the baseplate are provided with vertical guides in which the bolster is mounted with wedges for adjusting the amount of clearance of the bolster relative to the said guides.

3. A vertical hydraulic swaging press according to Claim 1, substantially as herein described with reference to, and as shown in, the accompanying drawings.

4. A vertical hydraulic swaging press comprising a baseplate supporting a table and a working cylinder having its bottom wall facing the table; return stroke cylinders and a bolster; said baseplate of the press being made as an all-cast frame pre-stressed by tie rods in the form of vertical through-extending columns supporting an auxiliary cross-piece located at the top outside the baseplate, the auxiliary cross-piece carrying the return stroke cylinders and a piston of the working cylinder rigidly connected to the bolster which is mounted for a directive movement in the baseplate frame.