JPH036880B2 - - Google Patents

Description

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

<Prior Art> A typical example of a conventional press device is shown in FIG. In this specification, the term "piston" is used to include not only a so-called "piston" but also a "ram."

This press apparatus 1 mainly consists of a cylinder unit 2, an upper frame 3, a slide table 4, a lower frame 5, and four supports 6, 6...
moves up and down, and press work is performed between the slide table 4 and the lower frame 5.

However, this press apparatus 1 requires (a) an upper frame 3 for supporting the cylinder unit 2 in addition to the slide table 4 as a "movable frame" and the lower frame 5 as a "fixed frame"; Since the cylinder unit 2 for main pressurization also takes charge of the entire vertical movement of the slide table 4, its size is inevitably large, and as a result, the size and weight of the entire device become large. (b) In cylinder unit 2, the volume of the hydraulic oil (pressure oil) changes greatly during the main pressurization, but since there is a large amount of hydraulic oil that has a large volume change, it is difficult to transmit force. Response is slow. (c) A large amount of hydraulic oil is used. ...There was room for improvement from these points.

Therefore, a press device 10 shown in FIGS. 7 to 9 was proposed to improve these points.
It is.

In this press apparatus 10, the upper frame 3 of the press apparatus 1 is omitted, and four pillars 12, 12, . . . are fixed to an upper frame 11 serving as a "movable frame". The upper frame 11, together with the columns 12, 12..., is movable up and down with an auxiliary hydraulic cylinder 14 relative to the lower frame 13 serving as a "fixed frame", and the upper frame 11 is moved up and down to near the main pressurizing position. When it is lowered, the clamp mechanism 15 is activated, and each support column 12, 12... is clamped to each piston 17, 17... of each corresponding main pressurization hydraulic cylinder 16, 16..., so that main pressurization is performed. has been done. Each clamp mechanism 15, the details of which are shown in FIG. The female and male screws 18 and 20 are pressed against each other to engage with each other to obtain a clamping force. That is, in this press apparatus 10, the upper frame 3 of the press apparatus 1 is configured as described above.
The above points (a) to (c) are improved because the parts corresponding to the above are omitted and the vertical movement of the upper frame 11 and the main pressurization are performed by separate hydraulic cylinders. be.

<Problems to be Solved by the Invention> However, the clamp mechanism 15 is not necessarily sufficient. In other words, since it depends on the engagement of the male screw 18 and the female screw 20, the clamping position is restricted, and as a result, the height and size of the pressurized object that can be targeted is limited, and the structure is also relatively This means that it is complicated and difficult to process.

In view of these circumstances, the present invention aims to eliminate the problems seen in the conventional clamp mechanism while taking advantage of the advantages of the press device having the basic configuration as described above.

<Means for Solving the Problems> As a means for solving the above problems, in the present invention, in a press device having the basic configuration as described above, the clamp mechanism is attached to the piston of the hydraulic cylinder for pressurization. The main idea is to connect a sleeve formed of a thin plate, form a hydraulic chamber between the piston and the sleeve, and press this sleeve against the above-mentioned column using hydraulic pressure. Alternatively, the gist is to use the pillar as a cylinder, and furthermore, a position detection sensor is provided corresponding to each pillar, and each position detection sensor detects the positional relationship between the fixed frame and the movable frame in each pillar. The main idea is to be able to freely control the stroke amount of each main pressurizing hydraulic cylinder based on the results.

<Operation> In other words, since the sleeve is pressed against the support column and the clamping force is obtained by the abrasion force caused by the pressing, there are no restrictions on the clamping position, and the structure is also simpler. Also, since the support can also be used as the piston or cylinder of the auxiliary hydraulic cylinder,
It has fewer parts and is therefore smaller. It is lightweight, and since the stroke amount of each pressurizing hydraulic cylinder is controlled by detecting the positional relationship with a position detection sensor, the parallelism between the fixed frame and the movable frame can be improved and higher precision can be achieved. This allows press working to be performed.

<Example> Hereinafter, an example will be described with reference to FIGS. 1 to 5. In the following description, parts common or similar to the conventional art and each embodiment are designated by the same reference numerals, and redundant description will be omitted.

First Embodiment (FIGS. 1 and 2) A press device 30 according to this embodiment is different from the above-described press device 10 only in its clamp mechanism 31, so only the portion related to the clamp mechanism 31 is illustrated. Other parts are omitted.

This clamp mechanism 31 uses a sleeve 32 as a means for obtaining clamping force. The sleeve 32 is formed by forming a thin plate into a cylindrical shape with a diameter slightly larger than that of the support column 12, given the conditions described later. Fixed. A hydraulic chamber 33 is formed between the piston 17 and the sleeve 32, and pressurized pressure oil A can be freely supplied to the hydraulic chamber 33. That is, the sleeve 32 is deformed and pressed against the support column 12 by the hydraulic pressure of oil A as shown in FIG. It is something. According to experiments, the necessary and sufficient clamping force can be obtained by making the friction surface approximately three times or more the diameter of the strut. Since the clamping force of the sleeve 32 is proportional to the pressure of the pressure oil A and inversely proportional to the force required to deform the sleeve 32, it is desirable that the sleeve 32 be as thin as possible and have a small elastic modulus. It must have the strength to withstand force. Steel is an example of a material that satisfies these conditions.

In this way, pressing the sleeve 32 against the support column 12 and obtaining a clamping force by the frictional force caused by the pressing has the excellent advantage that there are no restrictions on the clamping position. At the same time, it also has the advantage of requiring a simpler structure.

By the way, it is natural for everyone to have doubts at first about whether the necessary clamping force can be obtained with such frictional force alone, but this seemingly obvious question (i.e., common sense) is the basis of the present invention. It can be said that this was the biggest obstacle that had to be overcome in order to reach this goal.

Second Embodiment (FIG. 3) This embodiment is characterized by the state in which the sleeve 40 is fixed to the piston 17. That is, a thread-shaped unevenness 41 is provided on the side surface of the hydraulic chamber 33 of the sleeve 40, and an unevenness 42 that engages with the unevenness 41 is provided on the piston 17, and both the unevenness 41,
42, the piston 17 of the sleeve 40
This makes the fixing force even more reliable.

Third Embodiment (Fig. 4) This embodiment is based on the auxiliary hydraulic cylinder 14 described above.
Instead, an auxiliary hydraulic cylinder 46 formed by a booster cylinder 44 and a booster ram 45 formed at the bottom of each column 12 is used, and a position detection sensor 47 is provided corresponding to each column 12. The lower frame 13 (“fixed frame”) and upper frame 11 (“movable frame”) in each support column 12 are detected by each position detection sensor 47.
The positional relationship between them is detected, and the stroke amount of each main pressurizing hydraulic cylinder 16 is controlled based on the result. Such auxiliary hydraulic cylinder 4
The adoption of position detection sensor 47 reduces the number of parts and contributes to making the entire device more compact and lightweight.
3 and the upper frame 11, thereby enabling press working with higher precision.

Fourth Embodiment (Fig. 5) This embodiment is a modification of the third embodiment.
The lower part of the booster ram 50 is a booster ram 50, and a booster cylinder 51 is provided in the extending direction of the booster ram 50. The booster ram 50 and the booster cylinder 51 form an auxiliary hydraulic cylinder 52.

Note that the clamp mechanism is not shown in FIGS. 4 and 5.

<Effects of the Invention> As explained above, the press device according to the present invention (a) presses the sleeve against the support column and obtains a clamping force from the abrasion force caused by the pressing, thereby improving the clamping position. This means that there are no restrictions, and it is possible to process pressurized objects of any height and size that can fit within the maximum distance between the movable frame and the fixed frame, and the structure is simpler. As a result, the entire structure can be made lighter and smaller.

(b) Also, by making the support column also serve as the piston or cylinder of the auxiliary hydraulic cylinder, the number of parts can be reduced, and the whole can be made lighter and smaller.

(c) Furthermore, by controlling the stroke amount of each main pressurizing hydraulic cylinder by detecting the positional relationship with a position detection sensor, the parallelism between the fixed frame and the movable frame can be improved, resulting in higher precision. Press processing can be performed.

[Brief explanation of the drawing]

1 and 2 are partial schematic sectional views of a press apparatus according to a first embodiment, FIG. 3 is a partial schematic sectional view of a press apparatus according to a second embodiment, and FIG. 4 is a partial schematic sectional view of a press apparatus according to a second embodiment. FIG. 5 is a partial schematic sectional view of a press device according to a fourth embodiment; FIG. 6 is a schematic side view including a partial cross section of a conventional press device; 7 is a schematic side view including a partial cross section of another conventional press device; FIG. 8 is a schematic side view seen from the direction of the arrow in FIG. 7;
FIG. 9 is a partially enlarged sectional view of the clamp mechanism of the press device shown in FIG. 7. 10, 30... Press device, 11... Upper frame (movable frame), 12... Support column, 13...
Lower frame (fixed frame), 14, 46, 5
2...Auxiliary hydraulic cylinder, 15, 31...Clamp mechanism, 16...Main pressurizing hydraulic cylinder, 17...
...Piston, 32, 40...Sleeve, 33...
Hydraulic chamber, 44, 51...Booster cylinder, 4
5, 50...booster ram, 47...position detection sensor.

Claims (1)

[Claims] 1. A movable frame having a plurality of columns is movable forward and backward with respect to a fixed frame by an auxiliary hydraulic cylinder, and each clamp mechanism is activated when the movable frame has moved to near the main pressurizing position. In a press device in which each support column is clamped to the piston of a corresponding hydraulic cylinder for main pressurization to perform main pressurization, the above-mentioned clamping mechanism has a sleeve formed of a thin plate attached to the piston of the hydraulic cylinder for main pressurization. A press device characterized in that a hydraulic chamber is formed between the piston and the sleeve while being connected to each other, and the sleeve is pressed against the support column by hydraulic pressure. 2. The press device according to claim 1, wherein the sleeve is made of steel. 3. The press device according to claim 1 or claim 2, wherein the support column also serves as the piston or cylinder of the auxiliary hydraulic cylinder. 4 A position detection sensor is provided corresponding to each column, and each position detection sensor detects the positional relationship between the fixed frame and the movable frame on each column, and based on the result, the stroke amount of each main pressurizing hydraulic cylinder is determined. 4. The press apparatus according to claim 1, 2, or 3, wherein the press apparatus can be freely controlled.