CN204398357U - A kind of double action hydraulic press - Google Patents

Abstract

The utility model relates to a double-acting hydraulic machine. The double-acting hydraulic machine includes a frame with an upper beam. The upper beam is fixed with a vertically arranged inner hydraulic cylinder and an outer hydraulic cylinder. The inner hydraulic cylinder has a drive connection with the inner molding die. The first piston and the outer hydraulic cylinder have a second piston for transmission connection with the outer forming die sheathed on the outer periphery of the inner forming die. The utility model provides a double-acting hydraulic press capable of reducing the manufacturing cost of complex-shaped or large-scale metal parts.

Description

A double-acting hydraulic press

technical field

The utility model relates to a double-action hydraulic press used for metal plastic processing.

Background technique

In the plastic forming technology of modern manufacturing, hydraulic press occupies a very important position. Among them, the widely used hydraulic press is the double-acting hydraulic press. At present, the double-acting hydraulic press is mainly used in: (1) Vertical double-acting hydraulic press for stamping and stretching, which is mainly used to complete the two processes of edge pressing and stretching in sequence. The hydraulic press of this type The specific structure is the "double-acting hydraulic machine" disclosed by the Chinese patent with the publication number CN1203381215U. This hydraulic machine includes a column, and the upper end of the column is fixed with an upper beam. For the side slider, the upper beam is fixed with a stretching hydraulic cylinder connected to the main slider, and the main slider is fixed with a side hydraulic cylinder connected with the side slider. When in use, the stretching hydraulic cylinder Drive the main slider to go down. When the main slider goes down, it drives the blank holder slider to go down. When the blank holder mold on the blank holder slider contacts the blank, the main slider continues to go down driven by the stretching hydraulic cylinder, and through the control The expansion and contraction of the blank holder hydraulic cylinder prevents the blank holder slider from continuing to move downward, and the blank holder mold on the blank holder slider only plays the role of blank holder positioning, and does not play a role in forming, so the pressure of the blank holder hydraulic cylinder does not need to be adjusted. If it is too large, the power of the blank holder hydraulic cylinder on the base plate can meet the use requirements when it is not more than half of the power of the stretch hydraulic cylinder. It can reach 10-45m/s; (2) The horizontal double-action press for metal profile processing is mainly used to complete the forming of the inner and outer surfaces of the profile, and drive the inner and outer forming molds to demould sequentially. In the forging and extrusion molding of metal parts, vertical single-acting hydraulic presses are generally used at present. Corresponding to the forming of simple shapes and small and medium-sized metal parts, the use of vertical single-acting hydraulic presses has obvious advantages. For the forming of complex shapes or large metal parts, the lack of forming capacity of vertical single-acting hydraulic presses is undoubtedly exposed. The current methods to make up are: 1. Continuously manufacture single-acting hydraulic presses with larger tonnages for forging or extruding large metal parts; 2. Adopt the method of increasing the subsequent processing allowance, and the subsequent steps are very cumbersome. The above two methods will greatly increase the processing cost of metal parts. Compared with the single-acting hydraulic press, the existing double-acting hydraulic press only has one more blank-holding procedure, which still cannot meet the forming requirements of complex or large metal parts.

Utility model content

The purpose of the utility model is to provide a double-acting hydraulic press which can reduce the manufacturing cost of complex-shaped or large-scale metal parts.

In order to solve the above problems, the technical solution of the utility model is:

The double-acting hydraulic press includes a frame with an upper crossbeam, on which there are vertically arranged inner hydraulic cylinders and outer hydraulic cylinders, the inner hydraulic cylinder has a first piston for transmission connection with the inner molding die, and the outer hydraulic cylinder It has a second piston for transmission connection with the outer molding die sleeved on the outer periphery of the inner molding die.

The inner hydraulic cylinder and the outer hydraulic cylinder are coaxially arranged.

The second piston is a hollow ring structure, and the second piston is sleeved on the periphery of the first piston.

The outer hydraulic cylinder includes a second cylinder whose axis extends in the up-and-down direction, the inner hydraulic cylinder includes a first cylinder coaxially arranged in the second cylinder, and the second piston is guided and slidably mounted on the In the annular space surrounded by the first and second cylinder blocks.

The outer hydraulic cylinder includes a second cylinder body with an inner sleeve and an outer sleeve, the inner sleeve and outer sleeve are coaxially arranged, and the inner hydraulic cylinder includes a first cylinder body fixed on the upper end of the second cylinder body, The first piston includes a piston section that is guided and sealed to be slidably fitted in the first cylinder and a piston rod section that is guided and penetrated in the inner hole of the inner sleeve, the second piston is a hollow ring structure, and the second piston The sealing guide is slidingly assembled in the annular space surrounded by the inner sleeve and the outer sleeve.

There are at least two outer hydraulic cylinders, and each outer hydraulic cylinder is evenly distributed on the periphery of the inner hydraulic cylinder.

An outer slider for installing the outer molding die is installed on the frame below the upper beam along the up and down direction, and the lower end of the second piston is connected with the outer slider to drive the outer slider up and down. The outer slider is provided with a guide hole that runs through the upper and lower end faces of the outer slider in the up and down direction, and the lower end of the first piston is connected with an inner slider for installing the inner molding die, and the inner slider guides through the in the guide hole.

The frame includes four upright columns whose axes all extend in the up-and-down direction, the outer slide block is guided and slidably assembled on the upright columns, and the upper beam is fixedly arranged on the upper end of the upright columns.

A lower beam is fixed below the outer slide block on the column.

The beneficial effects of the utility model are: for some parts with large deformation or high strength, if one-time extrusion is used, due to the large deformation in the process from the blank to the final product, a hydraulic press with a larger tonnage must be used. This will increase the purchase cost of the equipment and further increase the production cost of the parts. In this double-acting hydraulic press, the inner forming die can be connected with the first piston, and the outer forming die can be connected with the second piston. When extruding the billet, the first piston of the inner hydraulic cylinder first drives the inner forming die. Move down to extrude the billet, so that the billet is formed at one time, and then the second piston of the outer hydraulic cylinder drives the outer forming die to move down to continue extruding the billet, and the billet is secondary formed (or the second piston drives the outer forming die first) move the blank for one-time forming, and then the inner first piston drives the inner forming die to move down for secondary forming of the blank), that is to say, the double-acting hydraulic press outputs two forming actions, so that the deformation of the blank to the final product is divided into It is completed by two extrusions, and the amount of deformation each time will not be very large, which reduces the pressure tonnage demand for the double-acting hydraulic press, reduces the manufacturing cost of the double-acting hydraulic press and further reduces the production cost of metal parts.

Description of drawings

Fig. 1 is the structural representation of embodiment 1 of the present utility model;

Fig. 2 is a schematic diagram of cooperation of the inner and outer hydraulic cylinders in Fig. 1;

Fig. 3 is a schematic diagram of cooperation of the inner and outer hydraulic cylinders in Embodiment 2 of the present utility model;

Fig. 4 is a schematic structural view of Embodiment 3 of the present utility model.

Detailed ways

Embodiment 1 of the double-acting hydraulic press is shown in Figures 1 to 2: it includes a frame, and the frame includes four columns 3 whose axes extend in the up and down direction. The upper and lower ends of the columns are respectively fixed with an upper beam 1 and a lower beam 4, An outer slide block 2 that can move up and down is guided between the upper and lower beams on the column, and the lower end of the outer slide block has a T-shaped groove for installing the outer forming die. The upper end of the lower beam has a T-shaped groove for installing the die, and the lower beam is provided with an ejection cylinder 5 . The upper beam is provided with vertically arranged inner hydraulic cylinders 31 and outer hydraulic cylinders 32, the inner and outer hydraulic cylinders are coaxially arranged, the inner hydraulic cylinder has a first piston, the outer hydraulic cylinder has a second piston 14, and the outer hydraulic cylinder includes The second cylinder body, the second cylinder body includes the inner sleeve 9 and the outer sleeve 13 which are integrally arranged on the coaxial line, the second piston guide seal is slidably fitted in the annular space surrounded by the inner and outer sleeves, and the inner hydraulic cylinder includes the inner sleeve which is fixed on the second The first cylinder 11 at the upper end of the cylinder, the first piston includes a piston section 12 that is slidably fitted in the first cylinder and a piston rod section 6 that is guided and penetrated in the inner hole of the inner sleeve, and the second piston is sleeved On the periphery of the piston rod section, the lower end of the second piston is fixedly connected with the outer sliding block. The outer slider is provided with a guide hole 10 whose axis extends in the up and down direction, and the lower end of the piston rod section of the first piston is fixedly connected with an inner slider 30 for installing the inner molding die. The block can move up and down along the guide hole. When forming the blank, the outer forming die is sleeved on the outer periphery of the inner forming die. In this embodiment, both the outer molding die and the inner molding die are concave dies.

Take the inner hole extrusion of large cup-shaped parts as an example. For the extrusion molding of the inner hole of large cup-shaped parts, if a single-acting hydraulic press is used, it must be formed at one time to complete the size requirements of the inner hole, which requires a large-tonnage hydraulic press to achieve. Multiple moldings can be realized on the double-acting hydraulic press of the present invention, and the specific steps are as follows: (1) Install the forming die on the upper end surface of the lower beam, the inner molding die on the lower end surface of the inner slider, and the outer molding die on the outer side Form the lower end surface of the slider, (2) when extrusion molding, put the blank into the die, (3) the first piston drives the inner slider, thereby driving the inner forming die to move down, and perform the first step on the billet in the die Secondary molding, (4) After the first molding of the blank, the first piston does not move, and the outer piston drives the outer slider, thereby driving the outer molding die to move down, and performs secondary molding on the blank. (5) If the inner hole size requirement of the large cup-shaped part has been reached after two moldings, the workpiece is ejected from the die through the ejection cylinder after the blank is formed. If the inner hole size requirements of large cup-shaped parts are still not met after two moldings, the punch can be replaced for the third molding. The specific steps are as follows: (6) remove the inner molding die and outer molding die, (7) Install the core of the three-time molding mold with the same size as the inner hole size of the part after the second molding (that is, the size of the outer molding die) on the lower end surface of the inner slider, and install the three-time molding punch on the lower end surface of the outer slider, (8 ) Put the blank after the secondary molding into the die, (9) the first piston drives the inner slider, thereby driving the core of the three-time molding mold to move down until it contacts the bottom of the inner hole of the blank, (10) the first piston does not The outer piston drives the outer slider, thereby driving the three-time forming punch to move down, and the blank is processed and formed three times. (11) By analogy, each time the punch is replaced, one molding can be added until the inner hole size meets the requirements. In this way, the extrusion molding of large cup-shaped parts can be divided into multiple processes, and the extrusion force of each process will be reduced accordingly. The forming based on the utility model patent of this vertical double-acting hydraulic press can be cold forming or warm forming. When performing warm forming, the thermal expansion and contraction effects of the blank and the mold need to be considered. The outer hydraulic cylinder in the double-acting hydraulic press of the utility model is also used for forming, so the pressure provided by the inner and outer hydraulic cylinders is basically the same. The down speed of the slider is generally 8~20mm/s.

When extruding a large deformation or high strength workpiece, the deformation from the blank to the finished product is divided into multiple times, and each time does not require a particularly large extrusion force, thereby reducing the pressure tonnage demand for the double-acting hydraulic press. , reducing the production cost of the double-acting hydraulic press.

In other implementations of the present utility model: the number of columns can also be two, three or more; the frame can also be a frame structure, and the overall strength and rigidity of the frame structure are better. The sliding fit between the frames is guided by dovetails and dovetail grooves; the inner and outer sliders can also be omitted, and at this time the inner and outer molding dies can be directly fixed on the first and second pistons; the inner and outer molding dies can also be Convex mold, at this time, the concave mold needs to be installed on the lower beam.

Embodiment 2 of the double-acting hydraulic machine is shown in Figure 3: the difference between Embodiment 2 and Embodiment 1 is that the outer hydraulic cylinder includes a second cylinder body 22 whose axis extends in the up and down direction, and the second cylinder body is a cup with the opening facing downward. Shaped structure, the inner hydraulic cylinder includes a first cylinder body 11 whose axis extends in the up and down direction, the first cylinder body 11 is coaxially arranged in the second cylinder body 22, a first piston 12 is arranged in the first cylinder body, and the first cylinder body 11 is coaxially arranged in the second cylinder body 22. A second piston 14 is arranged in the annular space between the cylinder and the second cylinder. Item 2 in Figure 3 represents the outer slider.

Embodiment 3 of the double-acting hydraulic press is as shown in Figure 4: the difference between Embodiment 3 and Embodiment 1 is that the axis of the outer hydraulic cylinder 32 is parallel to the axis of the inner hydraulic cylinder 31, there are two outer hydraulic cylinders, and two outer hydraulic cylinders The cylinders are evenly distributed on the periphery of the inner hydraulic cylinder. Item 1 in Figure 4 indicates the upper beam; item 2 indicates the outer slider; item 3 indicates the column; item 4 indicates the lower beam; item 5 indicates the ejection cylinder. In other embodiments of the present invention, the number of inner hydraulic cylinders may be two, three or more, and the number of outer hydraulic cylinders may be three, four or more.

Claims (9)

1. double action hydraulic press, comprise the frame with entablature, it is characterized in that: the inner side hydraulic cylinder and the outside hydraulic cylinder that entablature are installed with vertical layout, inner side hydraulic cylinder has the first piston for being in transmission connection with inner side shaping mould, and outside hydraulic cylinder has the second piston for being in transmission connection with the outside shaping mould being set in shaping mould periphery, described inner side.

2. double action hydraulic press according to claim 1, is characterized in that: described inner side hydraulic cylinder, outside hydraulic cylinder are coaxially set.

3. double action hydraulic press according to claim 2, is characterized in that: described second piston is hollow circular structure, and the second piston bush is located at the periphery of described first piston.

4. double action hydraulic press according to claim 3, it is characterized in that: described outside hydraulic cylinder comprises the second cylinder body that axis extends along the vertical direction, described inner side hydraulic cylinder comprises the first cylinder body be coaxially set in described second cylinder body, in the annular space that described second piston guide slidable fit surrounds in first, second cylinder body.

5. double action hydraulic press according to claim 2, it is characterized in that: described outside hydraulic cylinder comprises second cylinder body with inner sleeve, overcoat, described inner sleeve, overcoat are coaxially set, described inner side hydraulic cylinder comprises the first cylinder body being fixedly arranged on described second cylinder body upper end, described first piston comprises the piston section of pilot seal slidable fit in the first cylinder body and the piston rod segment be arranged in the endoporus of described inner sleeve that leads, described second piston is hollow circular structure, in the second annular space that piston seal guiding is slidedly assemblied in inner sleeve, overcoat surrounds.

6. double action hydraulic press according to claim 1, is characterized in that: described outside hydraulic cylinder has at least two, and each outside hydraulic cylinder is distributed in the periphery of described inner side hydraulic cylinder.

7. the double action hydraulic press according to claim 1 ~ 6 any one, it is characterized in that: described frame leads along the vertical direction in the below of described entablature the outside slide block be equipped with for installing described outside shaping mould, the lower end of described second piston is connected to drive outside slide block to move up and down with described outside slide block, outside slide block is provided with the pilot hole running through slide block upper and lower end face, outside along the vertical direction, the lower end of described first piston is connected with the inside block for installing described inner side shaping mould, and described inside block guiding is arranged in described pilot hole.

8. double action hydraulic press according to claim 7, is characterized in that: described frame comprises the column that four axis extend all along the vertical direction, and described outside slider guide is slidedly assemblied on described column, and described entablature is fixedly arranged on the upper end of described column.

9. double action hydraulic press according to claim 8, is characterized in that: described column is installed with sill in the below of described outside slide block.