JPH03264200A - Pressing apparatus - Google Patents

Abstract

PURPOSE:To execute working with high accuracy by giving a lubricating function to posts and a clamping mechanism for frames and also constituting this apparatus so as to hold the clamping effect in the pressing apparatus where both movable and fixed frames pressurizing worked through the posts. CONSTITUTION:In the pressing apparatus where the clamping mechanism is worked when the movable and fixed frames 2, 3 approach main pressurizing positional condition, the clamping mechanism 6 for pushing a thin plate sleeve 11 to the post 4 by a hydraulic press and a lubricant basin 13 for temporarily removing the lubricant stuck to the post 4 in the sleeve 11, are arranged. By this method, the lubricating function between the post 4 and the frame 2 is sufficiently secured, and effect of the lubricant at the time of clamping is reduced to make clamping sure and the working accuracy can be improved.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a press device.

[Conventional technology]

Ganto Toyama previously proposed improvements to press equipment in Japanese Patent Application No. 1983-71830 (Japanese Patent Application No. 1-245999) and Japanese Patent Application No. 1-237140.

In this proposal, the movable frame and the fixed frame, which are placed opposite each other via the support column, approach and separate using an auxiliary hydraulic cylinder, and when both the movable and fixed frames approach to the main pressurized position, the clamp mechanism is activated. This is an improvement regarding a press device in which the main pressurizing force from the main pressurizing hydraulic cylinder is transmitted to the movable frame, and particularly relates to an improvement of the clamp mechanism.

Specifically, the clamp mechanism transmits the main pressing force to the column by pressing a sleeve formed of a thin plate against the column using hydraulic pressure, thereby eliminating restrictions on the clamp position. Moreover, the structure is simplified.

[Problem to be solved by the invention]

By the way, the support column slides on the frame (movable frame, fixed frame), and therefore a lubricant is applied between the support support and the sliding portion of the frame. In other words,
Although lubricant is always attached to the column, this lubricant is not desirable for the lamp mechanism as described above.

Therefore, in this invention, we have developed a press device with a clamp mechanism that maintains the lubricating function for sliding between the column and the frame, while minimizing the influence of the lubricant on the clamp. For the purpose of providing.

[Means and effects for solving the problem] The purpose of this is to apply lubricant attached to the column to the sleeve of the clamp mechanism in a press device having the above-mentioned basic configuration and clamp mechanism. This is achieved by recessing a lubricant reservoir which is temporarily removed from the contact surface of the sleeve.

That is, by pressing the sleeve against the column, the lubricant is temporarily forced into and removed from the lubricant reservoir of the sleeve, so that the contact surface between the column and the sleeve is almost free of lubricant. As a result, the influence of the lubricant on the clamp can be reduced, allowing more reliable ramping. Preferably, such a sleeve is made of steel.

This type of press device has a support that extends from the piston rod of the main hydraulic cylinder for pressurization, and a movable frame that can be fixed and released from the support using a clamp mechanism to release the vertical movement of the support. A pit can be eliminated. In other words, according to this structure, only the movable frame moves up and down to approach and move away from the fixed frame, and the column only needs to make a slight up and down movement for the main pressurization. This eliminates the need for a pit to release the water.

A concrete ramp mechanism for this purpose includes a cylinder member provided on a movable frame, a sleeve attached to the inner wall of the cylinder member, and a hydraulic pressure chamber for hydraulic pressure for supporting the support column between the inner wall of the cylinder member and the sleeve. It is preferable to form.

When the strut is separate from the piston rod of the main hydraulic cylinder for pressurization, the clamp mechanism is to connect a sleeve to the piston rod of the hydraulic cylinder for main pressurization, and to connect the support to the piston rod between the piston rod and the sleeve. It is possible to use a structure in which a hydraulic pressure chamber is formed for hydraulic pressure.

Further, in such a press device, by using the piston rod or cylinder of the auxiliary hydraulic cylinder also as a support, the number of parts can be reduced, and the press device can be made smaller and lighter.

Furthermore, such a press device is provided with a position detection sensor corresponding to each column, and each position detection sensor detects the positional relationship between the movable frame and the fixed frame on each column, and based on the result, each position detection sensor is installed in correspondence with each column. By making the stroke amount of the pressurizing hydraulic cylinder freely controllable, the parallelism between the movable frame and the fixed frame can be improved and press working can be performed with higher precision.

〔Example〕

Embodiments of the press apparatus according to the present invention will be described below.

In the following description, the same reference numerals will be used for parts common to each embodiment, and duplicate descriptions will be omitted as appropriate.

As shown in FIG. 3, this press device 1 consists of an upper frame 2 which is a movable frame, a lower frame 3 which is a fixed frame, and four columns 4. The upper frame 2 is vertically movable relative to the lower frame 3 by an auxiliary hydraulic cylinder 5. When the upper frame 2 is lowered to the vicinity of the main pressurizing position, the clamp mechanism 6 is activated to clamp the upper frame 2 to the four pillars 4, 4, -, and perform the main pressurizing. That is, the column 4 also serves as the piston rod 8 of the hydraulic cylinder 7 for main pressurization, and the clamp mechanism 6 clamps the upper frame 2 to the column 4 to perform main pressurization.

As shown in FIG. 1, the clamping mechanism 6 includes a cylinder member 10 fixed to the upper frame 2, and a sleeve 11, which is a means for obtaining a clamping force, provided inside the cylinder member 10.

The sleeve 11 is formed by forming a thin plate in a cylindrical shape with a diameter slightly larger than that of the support column 4 according to the conditions described below, and allows pressurized liquid to be freely supplied between the cylinder member 10 and the inner wall of the cylinder member 10. It is attached so as to form a hydraulic pressure chamber 12. That is, if the sleeve 11 is deformed and pressed against the support 4 by the hydraulic pressure of the pressure fluid A into the state shown on the left side in FIG. 1, the gap between the sleeve 11 and the support 4 due to this pressed state The upper frame 2 is fixed to the column 4 by the frictional force, but otherwise the sleeve 11 is in the state shown on the right side of FIG. 1, and the upper frame 2 is separated from the column 4. Become.

Further, a lubricant reservoir 13 is recessed in the sleeve 11, as shown in FIG. This lubricant reservoir 13 minimizes the influence of the lubricant applied to the column 4 for sliding between the column 4 and the sliding parts 2s and 3s of the upper and lower frames 2.3, thereby making it more reliable. This is to make the lamp work. That is, the lubricant adhering to the strut 4 is transferred into the lubricant reservoir 13 and the sleeve 1 is transferred to the strut 4.
The contact surface between the support column 4 and the sleeve 11 is made to have almost no lubricant by being temporarily pushed in and removed by a pressing force of 1. Although the lubricant reservoir 13 in this embodiment is formed as an annular groove, it may be formed into any suitable shape, such as a spiral groove or a vertical groove, as long as it can perform the above function. You can choose the shape of.

According to experiments, a sufficient ramp force can be obtained by making the friction surface approximately three times the diameter of the pillar or more.

Since the clamping force of the sleeve 11 is proportional to the pressure of the hydraulic fluid and inversely proportional to the force required to deform the sleeve 11, it is desirable that the sleeve 11 be as thin as possible and have a small elastic modulus. It must have the strength to withstand. An example of a material that satisfies these conditions is steel.

In this way, by pressing the sleeve 11 against the support column 4 and obtaining a clamping force by the frictional force caused by this pressing, the clamping position can be improved compared to, for example, a conventional clamping mechanism that uses an interlocking uneven structure. This has the excellent advantage of not being subject to any restrictions, and also has the advantage that its structure can be simpler.

Incidentally, thread-like unevenness 14 is formed on the outer surface of the sleeve 11 and the inner wall of the cylinder member 10 in this embodiment, which makes the force transmission between the sleeve 11 and the cylinder member 10 more efficient. It is intended for use only, and is not necessarily necessary. That is, the sleeve 11 and the cylinder member 10
The inner wall may be flat.

The operating state of this press device 1 is as follows.

In the starting state, the piston rod 8, which also serves as the support column 4, is in a fixed state where it is pressed to the top dead center of the cylinder chamber by receiving hydraulic pressure from the S chamber 15 of the main pressurizing hydraulic cylinder 7. . In this state, the upper frame 2 descends and approaches the lower frame 3 to the main pressurizing position, that is, when the upper frame 2 touches or does not touch the workpiece M on the lower frame 3, the clamp Pressure fluid is supplied to the hydraulic pressure chamber 12 of the mechanism 6, and the upper frame 2 is fixed to the support column 4. At the same time, pressurized liquid is supplied to the P chamber 16 of the hydraulic cylinder 7 for main pressurization, and main pressurization is performed while the piston rod 8, that is, the support column 4 is slightly lowered.

The advantage of such a press device 1 is that only the upper frame 2 moves up and down to approach and move away from the lower frame 3, and the column 4 only moves up and down slightly for main pressurization. The point is that the pit P (FIG. 5) for escape of the support 4, which is necessary when the support 4 moves up and down in the same way as the upper frame 2, is not required.

FIG. 4 shows an example in which the auxiliary hydraulic cylinder 20 is provided above the upper frame 2. That is, the auxiliary hydraulic cylinder 20 is assembled to the upper frame 2, the tip of the piston rod 21 of this auxiliary hydraulic cylinder 20 is fixed to the base member 22 attached to the upper end of the support column 4, and the auxiliary hydraulic cylinder 20 is supported by the base member 22. The upper frame 2 is designed to move up and down.

The advantage of doing this is that the space between the upper frame 2 and the lower frame 3 is open on all sides, making it easier to take in and out materials and molds.

5 and 6) The press device 30 according to this embodiment differs from the first embodiment in that the support 31 is separate from the piston rod 33 of the main hydraulic cylinder 32. The upper frame 2 is fixed to this column 31.

A clamp mechanism 35 using a sleeve 34 similar to that of the first embodiment is provided between the piston rod 33 of the main pressurizing hydraulic cylinder 32 and the support column 31. That is, the sleeve 34 is appropriately fixed to the piston rod 33.
A hydraulic chamber 36 is formed between the piston rod 33 and the piston rod 33, and pressurized pressure liquid A can be freely supplied to the hydraulic chamber 36.

The press device 40 according to this embodiment is a modification of the third embodiment, in which a booster cylinder 41 is provided at the bottom of each column 31 in place of the auxiliary hydraulic cylinder 5. and booster ram 4
2, and a position detection sensor 4 corresponding to each support column 31 is used.
4, each position detection sensor 44 detects the positional relationship between the lower frame 3 and the upper frame 2 in each support column 31, and based on the result, each main pressurizing hydraulic cylinder 32
The stroke amount is controlled.

The use of such an auxiliary hydraulic cylinder 43 reduces the number of parts and contributes to making the entire device smaller and lighter. Also, the use of the position detection sensor 44 allows the lower frame 3 and the upper frame 2 This improves the parallelism between the two parts and enables more precise press working.

Fifth Embodiment (FIG. 8) This embodiment is a modification of the fourth embodiment, in which the lower part of the support column 31 is a booster ram 46, a booster cylinder 47 is provided in the extending direction, and the booster ram 46 and booster cylinder 47 are connected to each other. This is used as an auxiliary hydraulic cylinder 48.

In addition, illustration of the clamp mechanism is omitted in FIGS. 7 and 8.

〔Effect of the invention〕

The press device according to the present invention is as described above and has the following effects.

(a) A lubricant reservoir is recessed in the sleeve to temporarily remove lubricant adhering to the strut from the contact surface between the strut and sleeve, so the lubrication function between the strut and frame is improved. It can be secured sufficiently, and the influence of the lubricant can be reduced during clamping, allowing for more reliable ramping.

(b) By extending the support from the piston rod of the hydraulic cylinder for pressurization, and making it possible to fix and release the movable frame from the support using a clamp mechanism, there is no need for a pit to release the vertical movement of the support. It can be done.

(C) By making the piston or cylinder of the auxiliary hydraulic cylinder also serve as the support column, the number of parts can be reduced and the size and weight can be reduced.

(d) The positional relationship between the movable and fixed frames on each column is detected by a position detection sensor installed corresponding to each column, and the stroke amount of each main pressurizing hydraulic cylinder can be freely controlled based on the results. By doing so, it is possible to improve the parallelism between both the movable and fixed frames, and to perform press working with higher precision.

[Brief explanation of drawings]

FIG. 1 is a partial schematic sectional view of the clamp mechanism in the press device according to the first embodiment, FIG. 2 is a schematic perspective view of the clamp mechanism of FIG. 1 with the sleeve cut in half, and FIG. A schematic side view including a partial cross section of a press device according to the first embodiment; FIG. 4 is a schematic side view of a press device according to the second embodiment; FIG. 5 is a partial cross section of the press device according to the third embodiment. 6 is a partial schematic sectional view of the clamp mechanism in the press device according to the third embodiment; FIG. 7 is a partial schematic side view including a partial cross section of the press device according to the fourth embodiment. , and FIG. 8 is a partially schematic side view, including a partial cross section, of a press apparatus according to a fifth embodiment. ■, 30.40---m--Press device, 2----
1. Upper frame (movable frame), 3. 1. Lower frame (fixed frame), 4.3 toe-support, 5.
．． 20.43.48...～----・Auxiliary hydraulic cylinder, 6.35 Clamp mechanism, 7.32-・-------° Main pressure hydraulic cylinder, 8.33-...- Piston rod, 21 --- Piston rod, 1o --- Cylinder member, 11.34 --- Sleeve, 12.
36-----hydraulic pressure chamber, 13--... lubricant reservoir, 44
．． −・−Position detection sensor. Figure 1 Clanhu! Figure 2 Figure 5 Figure 7 Figure 6 3') Franz'mH Figure 8 A

Claims (7)

[Claims] (1) The movable frame and the fixed frame, which are placed opposite each other via the support, approach and separate using the auxiliary hydraulic cylinder, and when both the movable and fixed frames approach the main pressurized position, the clamp mechanism is activated. In a press device in which the main pressurizing force from the main pressurizing hydraulic cylinder is transmitted to the movable frame, the clamp mechanism presses the sleeve formed of a thin plate against the column using hydraulic pressure. The main pressurizing force is transmitted to the column by the sleeve, and the sleeve has a recessed lubricant reservoir for temporarily removing lubricant adhering to the column from the contact surface between the column and the sleeve. press equipment. (2) The press device according to claim 1, wherein the sleeve is made of steel. (3) The press device according to claim 1 or 2, wherein the support is extended from the piston rod of the main pressurizing hydraulic cylinder, and the movable frame is fixed to and released from the support by a clamp mechanism. . (4) The clamp mechanism includes a cylinder member provided on the movable frame, a sleeve attached to the inner wall of the cylinder member, and a hydraulic chamber for hydraulic pressure for pressing the support column between the inner wall of the cylinder member and the sleeve. The press device according to any one of claims 1 to 3, wherein the press device is formed by forming. (5) The clamp mechanism connects a sleeve to the piston rod of the pressurizing hydraulic cylinder, and forms a hydraulic chamber between the piston rod and the sleeve for the hydraulic pressure for pressing the support column. The press apparatus according to claim 1 or claim 2. (6) The press device according to claim 5, wherein the piston rod or cylinder of the auxiliary hydraulic cylinder also serves as a support. (7) A position detection sensor is provided corresponding to each column, and each position detection sensor detects the positional relationship between the movable frame and the fixed frame on each column, and based on the result, the hydraulic pressure for each main pressurization is 7. The press device according to claim 1, wherein the stroke amount of the cylinder is freely controllable.