JPH01245999A - Pressing apparatus - Google Patents

Abstract

PURPOSE:To simplify, lightening and miniaturize the construction by pushing a sleeve to a column and obtaining a clamping force by friction force with this pushing. CONSTITUTION:In clamping mechanism 31, the sleeve 32 is used as means for obtaining the clamping force and formed as cylindrical shape made of thin plate having a little larger diameter than the column 12, and a part thereof is fixed with suitable means to a piston 17 of an oil hydraulic cylinder 16 for main pressurization. The sleeve 32 is deformed by oil hydraulic force with pressurized oil A to push to the column 12 and the clamping force is obtd. by the friction force between the sleeve 32 and the column 12 with this pushing state. By this method, the construction can do by only simple one without receiving any restrict to the clamping position.

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" refers not only to the so-called "piston" but also to the "ram".
It is also used in a meaning that also includes.

This press equipment Tt1 is mainly composed of a cylinder unit 2, an upper frame 3, a slide table 4, a lower frame 5, and four columns 6,6, etc. 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 a slide table 4 as a "movable frame" and a lower frame 5 as a "fixed frame"; Since the cylinder unit 2 for pressurizing also handles the entire vertical movement of the slide table 4, its size inevitably becomes large, and the size and weight of the entire fruiting device become large. .゛(b) In the cylinder unit 2, the volume of the hydraulic oil (pressure oil) changes greatly during the main pressurization, but because the volume of the hydraulic oil whose volume changes is large, the force transmission and response are slow. Become. (C) A large amount of hydraulic oil is used. There was room for improvement in terms of ---111--, etc.

Therefore, a press apparatus 10 shown in FIGS. 7 to 9 has been proposed to improve these points.

In this press apparatus 10, the upper frame 3 in the press apparatus 1 is omitted, and the upper frame 11 as a "movable frame" has four columns 12, 12.
--- is fixed. This upper frame 11, together with struts 12.12, is connected to an auxiliary hydraulic cylinder 1 to a lower frame 13 as a "fixed frame".
The upper frame 11 is vertically movable at 4.
When the pressure has descended to near the main pressurizing position, the clamp mechanism 1
5 operates and corresponds to each main pressurizing hydraulic cylinder 16.16
. . . each piston 17, 17 .

Each clamp mechanism 1 whose details are shown in FIG.
5, a male thread 18 is provided on the support 12, and a female thread 20 is provided on the half ring-shaped clamp block 19, and when this clamp block 19 is pressed against the support 12, both female and male screws 18 and 20 are engaged. to obtain clamping force. That is, in this press apparatus 10, the upper frame 3. of the press apparatus l is constructed 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 the male screw 18 and the female screw 20 are engaged, 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 complicated. This means that processing is difficult.

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> In this invention, as means for solving the above problems,
In a press device having the above-mentioned basic configuration, the clamping mechanism is constructed by connecting a sleeve made of a thin plate to the piston of the pressurizing hydraulic cylinder, and forming a hydraulic chamber between the piston and the sleeve. The gist is that the sleeve is pressed against the above-mentioned pillar by hydraulic pressure, and the gist is that the pillar also serves as the piston or cylinder of the auxiliary hydraulic cylinder, and furthermore, a position detection sensor is installed corresponding to each pillar. The main idea is that the position detection sensors detect the positional relationship between the fixed frame and the movable frame on each support, and the stroke amount of each main pressurizing hydraulic cylinder can be controlled based on the results.

<Function> In other words, the sleeve is pressed against the column and the clamping force is obtained by the frictional force generated by the pressing, so there are no restrictions on the clamping position, and the structure is still simpler. In addition, since the column is also used as the piston or cylinder of the auxiliary hydraulic cylinder, the number of parts is reduced, which makes it smaller and lighter.Furthermore, the positional relationship can be detected by the position detection sensor, so that each addition can be done easily. Since the stroke amount of the pressure hydraulic cylinder is controlled, the degree of parallelism between the fixed frame and the movable frame can be improved and press working can be performed with higher precision.

Embodiments Hereinafter, embodiments will be described with reference to FIGS. 1 to 5. In the following description, parts that are common or similar to the conventional art and each of the embodiments will be denoted by the same reference numerals, and redundant description will be omitted.

1 and 2) The press device 30 according to this embodiment is different from the press device 10 described above only in its clamp mechanism 31, so only the portion related to the clamp mechanism 31 is illustrated. Stops and 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 the pressure oil A, and the clamping force is obtained by the frictional force between the sleeve 32 and the support column 12 due to this pressed state. 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. The sleeve 32 is
Since the clamping force 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 it be as thin as possible and have a small modulus of elasticity.
On the other hand, it must have the strength to withstand the necessary lamp force. An example of a material that satisfies these conditions is steel.

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 as to whether the required ramp force can be obtained with such frictional force alone, but this seemingly obvious question (i.e., common sense) is the real truth. It can be said that this was the biggest obstacle that had to be overcome in order to reach the invention.

(Figure 3) In this embodiment, the sleeve 40 is connected to the piston 17.
It is characterized by a fixed state. 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 meshes with the unevenness 41 is formed on the piston 17.
The sleeve 40
The fixing force to the piston 17 is made more reliable.

In this embodiment, a booster cylinder 4 formed at the bottom of each support column 12 is used in place of the auxiliary hydraulic cylinder 14 described above.
4 and a booster ram 45 are used, and a position detection sensor 47 is provided corresponding to each column 12, and each position detection sensor 47 detects the position of the lower frame 13 ( “Fixed frame”) and upper frame 11 (r movable frame)
) is detected, and the stroke amount of each main pressurizing hydraulic cylinder 16 is controlled based on the result. The use of such an auxiliary hydraulic cylinder 46 reduces the number of parts and contributes to making the entire device smaller and lighter. Also, the use of the position detection sensor 47 makes it possible to reduce the number of parts in the lower frame 13 and the upper frame 11. This improves the parallelism between the two and enables press working with higher precision.

This embodiment is a modification of the third embodiment, with a booster ram 50 at the bottom of the support column 12, and a booster cylinder 51 provided in the extending direction of the booster ram 50. 51 serves as 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 by the frictional force generated by the pressing, so that the press device according to the present invention is able to control the clamping position. This means that the object to be pressurized can be of any height and size as long as it can fit within the maximum distance between the movable frame and the fixed frame without being subject to any restrictions. It is simple and the whole can be made lighter and smaller.

(b) Also, by using the support 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 DESCRIPTION OF THE DRAWINGS] FIGS. 1 and 2 are partial schematic sectional views of a press apparatus according to a first embodiment, and FIG. 3 is a partial schematic sectional view of a press apparatus according to a second embodiment. , FIG. 4 is a partial schematic cross-sectional view of a press device according to a third embodiment, FIG. 5 is a partial schematic cross-sectional view of a press device according to a fourth embodiment, and FIG. 6 is a partial schematic cross-sectional view of a press device according to a fourth embodiment. FIG. 7 is a schematic side view including a partial cross section of another conventional press device; FIG. 8 is a schematic side view viewed 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. 1O130-----Press device 11-------
−−−・Upper frame (movable frame) 12−・−・−
・-Strut 13---1--Lower frame (fixed frame) 1
4.46.52------Auxiliary hydraulic cylinder 15.
3t-- Clamp mechanism 16--
Main pressurizing hydraulic cylinder 17 - Piston 32.40 - - Sleeve 33 - Hydraulic chamber 44.51 - Booster cylinder 45.50
−−−−−−−・Booster Ram 47・−−−−−−・−
Position detection sensor Figure 1 Ares device Figure 4 L4 Figure 5

Claims (4)

[Claims] (1) A movable frame having a plurality of columns is movable forward and backward with respect to a fixed frame using an auxiliary hydraulic cylinder, and when the movable frame moves to near the main pressurizing position, each clamp mechanism is activated and the corresponding columns are moved forward and backward. In a press device in which main pressurization is performed by clamping each column to the piston of a hydraulic cylinder for pressurization, the clamp mechanism has a sleeve formed of a thin plate connected to the piston of the hydraulic cylinder for main pressurization, and A press device characterized in that a hydraulic chamber is formed between the piston and the sleeve, 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 2, characterized in that the support column also serves as the piston or cylinder of the auxiliary hydraulic cylinder. (4) Provide a position detection sensor corresponding to each pillar,
Claim 1 or 2, characterized in that each position detection sensor detects the positional relationship between the fixed frame and the movable frame in each support, and the stroke amount of each main pressurizing hydraulic cylinder can be freely controlled based on the result. The press device according to claim 2 or claim 3.