JP3760325B2 - Slide guide device for press machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a slide guide device for a press machine, and more particularly, to bearing a guide post in a four-post guide type press machine with a fluid such as hydraulic pressure.
[0002]
[Prior art]
In general, in a press machine, an upper die is attached to a slide that reciprocates with respect to a lower die fixed to a bed, and a material inserted between the lower die and the upper die is moved by reciprocating the upper die. It is configured to be punched or squeezed. However, in recent years, when various products are required to have high accuracy with reduced prices, and press products are required to produce many high-quality products, press machines can be made faster and more accurate. There has been a demand for an improved press machine.
[0003]
In order to improve the processing accuracy of the press machine, it is important to improve the positional accuracy of the reciprocating movement of the slide. To that end, the clearance between the slide and the guide portion that guides the reciprocating movement of the slide is reduced. Must maintain a stable clearance.
[0004]
As a slide guide method of a conventional press machine, the slide slides between a flat guide part formed on the slide and a flat guide part formed on the press machine frame at the rear or side part of the slide. There have been provided a moving guide type and a type in which one or a plurality of cylindrical posts are inserted into a slide and guided through a bearing. However, in any case, the sliding portion has some clearance, and the clearance is reduced to perform high-precision processing.
[0005]
However, with the increase in the speed of the press machine, naturally, heat is generated in each part constituting the press machine and displacement due to thermal expansion occurs. In particular, a slide that reciprocates constantly has a large thermal displacement at the contact portion and the sliding portion, and in some cases, the slide center may be displaced and the processing accuracy may be changed.
[0006]
Therefore, conventionally, a press machine 21 having a countermeasure against thermal displacement as shown in FIG. 6 has been proposed. In this press machine 21, four guide posts 23 are arranged on a slide that reciprocates up and down, and a guide portion 24 that slidably guides the guide post 23 that is moved together with the slide is a column as a frame of the press machine 21. 21a is fixedly disposed.
[0007]
The guide portion 24 has two guide main bodies 25 and 25 that are disposed to face each other and have guide surfaces 25 a that engage with the outer peripheral surfaces of the respective guide posts 23, and support the respective guide main bodies 25 and 25. It has hemispherical support members 26 and 26, and holders 27 and 27 that hold the support members 26 and 26 and are disposed in the column 21a. The guide body 25 is disposed on the contact surface with the support member 26 so as to be movable in parallel with an axis Sa connecting the point A and the axis of the guide post. When the slide expands due to thermal displacement, the guide body 23 and the axis Sa The movement of the slide can be stabilized without applying an offset load to the guide post 23.
[0008]
[Problems to be solved by the invention]
However, since the guide post 23 and the guide main body 25 are slidably arranged in the press machine 21 described above, the guide surface 25a is likely to be worn by high-speed operation over a long period of time. As a result, the clearance of the guide surface increases and affects the accuracy. Further, the guide portion 24 has many parts for supporting the guide main body 25, and the cost increases, and the work for exchanging the guide main body 25 takes time.
[0009]
The present invention solves the above-described problems, and aims to provide a slide guide device for a press machine that enables higher-accuracy and higher-speed operation and reduces the cost by reducing the number of parts. To do.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the slide guide device for a press according to the present invention is configured as follows. That is,
A slide which is moved so as to approach away from the bed by a drive means, and four guide posts for guiding the movement of said slide, is configured to have the each of the guide posts guide support for the bearing portion, the A slide guide device for a press machine,
Each of the bearing portions is disposed around an outer peripheral surface of the post guide, and a plurality of fluid pressure chambers are disposed in the bearing portion, and a plurality of fluid pressure chambers are disposed in a vertical direction on the inner peripheral surface of the bearing portion. And a groove portion,
The fluid pressure chambers disposed in the respective bearing portions are formed so as to face each other in an orthogonal direction with respect to an axis connecting the guide posts disposed on a diagonal line,
The groove portions disposed in the respective bearing portions are formed so as to face each other on an axis line connecting the guide posts disposed on a diagonal line,
A fluid supply device is connected to each of the fluid pressure chambers via a flow rate control valve.
[0012]
Further, it is preferable that the guide post is disposed on a moving slide and the bearing portion is disposed on a press machine frame.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0014]
FIG. 1 is a view showing a main section of a press machine 1. The press machine 1 has a crown 2 at its upper part, a column 3 at its center part, and a bed 4 at its lower part. A clutch portion 5 that is driven and connected from a motor that does not operate, and a crankshaft 6 that is rotatably supported by the crown 2 and connected to the clutch portion 5 are disposed. A connection 7 is rotatably arranged at the center of the crankshaft 6, and a plunger 9 is connected to the lower part of the connection 7 via a ball indirect joint, whereby rotation of the crankshaft 6 is performed in the vertical direction of the plunger 9. It is converted to the reciprocating linear motion.
[0015]
The plunger 9 is connected to the upper center portion of the slide 10 through a bearing disposed on the crown 2, and transmits the reciprocating linear motion converted from the crankshaft 6 to the slide 10. The slide 10 is disposed in the column 3 so as to be reciprocally movable in the vertical direction, and has a main body portion 10a formed in a rectangular shape in plan view, and a protrusion portion 10b disposed downward at the lower four corners of the main body portion 10a. The guide posts 11 are fixedly disposed on the respective protrusions 10b.
[0016]
FIG. 2 is a plan sectional view of the press machine 1 and shows the relationship between the column 3 and the guide post 11. The column 3 formed in a rectangular shape in plan view is thick at the four corners toward the press center. Convex portions 3a are formed, and post metal 12 is press-fitted into the upper portions of the respective convex portions 3a. As shown in FIGS. 3 to 5, the post metal 12 is formed in a cylindrical shape, and a guide post 11 that moves together with the slide 10 is fitted on the inner peripheral surface so as to be slidable in the vertical direction. The post metal 12 has pocket chambers that are disposed at two locations so as to face diagonally as hydraulic pressure chambers in a direction orthogonal to an axis connecting the guide posts 11 disposed diagonally. 12a and two longitudinal grooves 12b disposed so as to face each other are formed on an axis connecting between the guide posts 11 disposed on the diagonal line.
[0017]
As shown in FIG. 3, the pocket chamber 12a is formed in a concave shape from the inner peripheral surface of the post metal 12 toward the outer peripheral direction, and an oil passage 12c through which oil from the outside flows into the central portion of the pocket chamber 12a is formed. Is formed. In each pocket chamber 12 a, a throttle valve 16 as a flow control valve is piped from the oil tank 14 through the pump 15 to the oil passage 12 c from the outside of the post metal 12, and flows from the oil tank 14. The oil flow rate is controlled.
[0018]
As shown in FIG. 4, the vertical groove 12 b is formed in the inner circumferential surface of the post metal 12 in the vertical direction so as to penetrate from the upper surface to the lower surface of the post metal 12, and flows into the pocket chamber 12 a. After the oil flows to the outer peripheral surface of the guide post 11, the oil is discharged downward.
[0019]
Therefore, the outer peripheral surface of the guide post 11 is guided by the oil to which pressure is applied in the pocket chamber 12a (so-called static pressure bearing).
[0020]
Next, the operation of the press machine 1 configured as described above will be described. The press 1 guided by a hydrostatic bearing is operated at a high speed.
[0021]
When an operation button (not shown) is operated, the rotation of a main motor (not shown), which is operated and rotated by the clutch unit 5, is transmitted to the crankshaft 6, and the crankshaft 6 is rotated. The rotation of the crankshaft 6 is transmitted to the plunger 9 through the connection 7 so as to be able to reciprocate linearly, and the slide 10 is reciprocated linearly up and down. On the other hand, simultaneously with the rotation of the main motor, the oil in the tank 14 is circulated so as to be supplied to each part of the press 1. A part of the oil supplied to each part flows into the throttle valve 16, is pressurized by passing through the throttle valve 16, and flows into the pocket chamber 12 a of the post metal 12.
[0022]
A guide post 11 fixed to the slide 10 is fitted in the post metal 12, and the pressure oil flowing into the pocket chamber covers and guides the outer peripheral surface of the guide post 11. Then, by operating the operation button, oil is supplied to the entire outer peripheral surface of the guide post 11 that slides in the post metal 11 so that a constant pressure is applied, and the supplied pressure oil is transmitted downward through the guide post 11. And is collected from the upper surface of the bed 4 to the tank 14 in the bed 4.
[0023]
The press machine 1 is operated at a high speed, and expansion due to heat occurs in each part as time passes. In particular, the sliding slide 10 is displaced in the axial pitch (post center) between the guide posts 11 due to thermal expansion, and the clearance between the guide posts 11 and the post metal 12 becomes unbalanced. However, the pressure oil supplied to the guide post 11 is the pressure oil supplied from the pocket chamber 12a to the outer peripheral surface of the guide post 11 in a portion displaced so that the clearance between the guide post 11 and the post metal 12 becomes small. Is discharged downward along the guide post 11 and discharged into the vertical groove 12 b and collected in the tank 14. And when oil escapes to the vertical groove 12b, the pressure applied to the guide post 11 is not increased, and the pressure is adjusted so as to be the same as the other portions.
[0024]
Therefore, since the outer peripheral surface of the guide post 11 is always subjected to a constant pressure oil load, the guide post 11 can be guided without causing an oil film breakage with the post metal 12.
[0025]
In the present embodiment, the slide guide device using four guide posts has been described, but the same applies to the case of two guide posts. However, the position of the pocket chamber 12a and the vertical groove 12b formed in the post metal 12 varies depending on the arrangement state of the guide posts 11. For example, when two guide posts 11 are arranged diagonally on the slide 10, as in the case of the four guide posts described above, they face each other in a direction orthogonal to the axis connecting the guide posts 11. Two pockets (or two or more) pocket chambers 12a may be formed and arranged so that two longitudinal grooves 12b are formed on the axis connecting the guide posts 11 relative to each other. Further, two vertical grooves 12b are arranged on the axis connecting the guide posts 11, and two pocket chambers 12a are arranged so as to face each other so as not to interfere with the two vertical grooves 12b. Also good.
[0026]
Further, when two guide posts 12 are arranged at the rear part of the slide 10 in parallel to the front surface of the slide, the vertical groove 12b faces the axis of the guide post 11 (parallel to the front surface of the slide). If the pocket chambers 12b are formed so as to be formed at two locations (two or more locations) so as to face each other so as not to interfere with the longitudinal grooves 12b. Good.
[0027]
Further, the post metal in which the pocket chamber is formed is divided into two so as to be smaller than half, and each of the two divided post metals is orthogonal to the axis line connecting the guide posts arranged diagonally. If it is arranged so as to face each other in the column, it is not particularly necessary to form a vertical groove in the post metal.
[0028]
If a seal member is disposed above the bearing portion disposed on the column, oil leakage from the upper portion of the bearing portion can be prevented.
[0029]
【The invention's effect】
As described above, according to the slide guide device of the press machine of the present invention,
The slide is configured to move toward and away from the bed by the driving means, a plurality of guide posts for guiding the movement of the slide, and a bearing portion for guiding and supporting the guide posts. . The bearing portion is disposed around the outer peripheral surface of the guide post, a fluid pressure chamber is formed in the bearing portion, and a fluid supply device is connected to the fluid pressure chamber via a flow control valve. Therefore, the guide post is guided to reciprocate in the vertical direction by the fluid. Therefore, since the guide post can slide with a fluid bearing in a substantially clearance-free state, it can be operated with higher accuracy and speed, and the fluid can also be used for lubrication and guides, reducing parts and reducing costs. It also leads to.
[0030]
Further, the slide guide device of the press machine according to the present invention includes four guide posts for guiding the movement of the slide, and a bearing portion for guiding and supporting each of the guide posts. Each of the bearing portions is disposed around the outer peripheral surface of the guide post, and a plurality of fluid pressure chambers formed in the bearing portion, and a plurality of groove portions formed in the longitudinal direction on the inner peripheral surface of the bearing portion, The fluid pressure chambers formed in the respective bearing portions are formed so as to face each other in a direction orthogonal to the axis line connecting the guide posts disposed on the diagonal line. The groove portions formed in the respective bearing portions are formed so as to face each other on an axis line connecting the guide posts disposed on the diagonal line. The fluid supply device is connected to each of the fluid pressure chambers via a flow control valve, so that the guide post can be guided by the fluid. Therefore, it is possible to guide the movement of the slide with substantially no clearance, and even if the guide post moves in the bearing due to the thermal displacement of the slide, the load applied to the fluid guide post can be adjusted. No unbalanced load is applied. Therefore, higher accuracy and higher speed operation can be achieved.
[0031]
Further, since the bearing by the fluid can also be used for lubrication, the number of parts can be reduced and the cost can be reduced.
[Brief description of the drawings]
1 is a front sectional view of a press having a slide device according to an embodiment of the present invention. FIG. 2 is a sectional view taken along line AA in FIG. 1. FIG. 3 is a sectional plan view showing details of a bearing portion in FIG. 4 is a cross-sectional view showing a pocket chamber of a post metal in FIG. 1. FIG. 5 is a cross-sectional view showing a vertical groove portion of the post metal in FIG. 1. FIG. 6 is a view showing a slide device of a conventional press machine. ]
DESCRIPTION OF SYMBOLS 1 ... Press machine 3 ... Column 10 ... Slide 11 ... Guide post 12 ... Post metal (bearing part)
12a ... Pocket chamber 12b ... Vertical groove 14 ... Oil tank (fluid supply device)
15 ... Pump (fluid supply device)
16 ... Throttle valve (flow control valve)

Claims (2)

A slide which is moved so as to approach away from the bed by a drive means, and four guide posts for guiding the movement of said slide, is configured to have the each of the guide posts guide support for the bearing portion, the A slide guide device for a press machine,
Each of the bearing portions is disposed around an outer peripheral surface of the post guide, and a plurality of fluid pressure chambers are disposed in the bearing portion, and a plurality of fluid pressure chambers are disposed in a vertical direction on the inner peripheral surface of the bearing portion. And a groove portion,
The fluid pressure chambers disposed in the respective bearing portions are formed so as to face each other in an orthogonal direction with respect to an axis connecting the guide posts disposed on a diagonal line,
The groove portions disposed in the respective bearing portions are formed so as to face each other on an axis line connecting the guide posts disposed on a diagonal line,
A fluid guide device is connected to each of the fluid pressure chambers via a flow rate control valve. The slide guide device for a press machine according to claim 1, wherein the guide post is disposed on a moving slide, and the bearing portion is disposed on a press machine frame .

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