JPH035276B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a press device that drives a reciprocating body such as a piston, a ram, etc. (hereinafter simply referred to as a "reciprocating body") using a hydraulic medium (for example, oil).

Conventional technology The force exerted by a hydraulic medium (for example, oil) to drive a moving body within a cylinder has directionality, and when moving the moving body forward or backward from the cylinder, the moving body rotates to a greater or lesser degree. It is known to do. When this reciprocating body is used in a press machine that performs molding by accurately aligning both upper and lower molds, the above-mentioned "rotation" is problematic, so (a) it is necessary to prevent rotation. Furthermore, there is a need to prevent the work table attached to the moving body from bending and "sag" during the molding process. It is used in combination with

For example, 4 cylinders can be used as an auxiliary multi-cylinder.
When a book, or in some cases nine multi-cylinders, is used in combination with a moving body that moves forward and backward, the size of the base portion of the press body tends to become large in order to support the moving body and the multi-cylinder.

Furthermore, in order to drive the moving body and the multi-cylinder, (d) a considerable amount of hydraulic pressure medium (for example, oil) is required, and the tank for the hydraulic pressure medium is usually placed on the rear (rear) side of the base of the press body. Since it is attached, (e) the floor area of the press body, i.e.,
The area of the press body that occupies the floor tends to be correspondingly large.

Furthermore, in the case of press equipment that requires molds, mold replacement is essential, and in order to replace heavy and expensive molds, careful replacement work using a forklift is required, and usually the product is transported and Mold replacement work is performed from the rear (rear) side of the press body, where it does not interfere with transport or other operations. As mentioned above, a tank for liquid pressure medium is attached to the rear of the press body, so (f)
A large forklift with a long reach is used to replace the mold, which takes time and effort.

Further, among press devices, devices used for processing electronic components, such as presses for resin sealing molding of IC lead frames, are often installed in a clean room. However, as is well known, the construction cost of this clean room is extremely high, and it is naturally desirable that the overall size of the equipment and equipment installed in the clean room, including floor area and vertical height, be as small as possible. Pressing equipment is no exception to this requirement; it is necessary that the overall size of the pressing equipment be small.

Problems to be solved by the invention When driving a moving body using a liquid pressure medium,
In order to prevent "rotation" from occurring in the moving body, the present applicant has previously provided a moving body with a rectangular cross-sectional shape and a hydraulic press device using the same.
See Publication No. 217805]. With this, the rotation prevention described in (a) above can be achieved, and if the end face of the rectangular moving body is made into a surface shape that matches the shape and size of the press die to be attached thereto, the above-mentioned (b) can be achieved. It was found that prevention of "sagging" was also achieved.

This invention is a further development of the technology previously proposed by the present applicant, in which the auxiliary multi-cylinder and slide guide are omitted, the base portion of the press body supporting the advancing and retracting body is made as small as possible, and yet A tank for liquid pressure medium is built into the base of the press body, making it easy to replace molds.
Furthermore, the present invention aims to provide a press apparatus that can be installed in a clean room and satisfies the conditions (c) to (g) above.

Means for Solving the Problems In order to achieve the above object, the present invention employs a movable movable body having a rectangular cross-sectional shape as in the previous proposal, and furthermore, a pressure chamber in the base part that supports and accommodates the movable movable body. The cross-sectional shape of the pressure chamber is square, and the area of the cross-sectional area for supporting and accommodating the pressure chamber is made small to match the rectangular movable body. In addition to (a) and (b) above, (c) to (t) can be achieved by changing the shape and moving the tank for storing the liquid pressure medium, which was conventionally located on the rear side, into the completed base part. ) conditions are also satisfied.

More specifically, as a means for solving the problem, in the press device according to the present invention, a movable moving body having a rectangular cross-sectional shape is connected to a movable body recessed in a base portion of the press main body. Supported and moved freely forward and backward in a pressure chamber with a rectangular surface shape.
At the same time, the base part has a hydraulic pressure medium chamber that can supply and discharge hydraulic pressure medium to and from the pressure chamber under control by an external hydraulic control unit, integrally and axially symmetrically around the pressure chamber. The gist is to provide a plurality of recesses so as to surround them.

Function The cross-sectional shape of the pressure chamber that supports and accommodates the forward-backward movable body while allowing it to freely move forward and backward can easily be made into a square shape corresponding to the rectangular cross-sectional shape of the forward-backward movable body. By making the pressure chamber square, compared to the conventional pressure chamber with a circular cross section, the pressure chamber takes up less space within the base of the brace body, in other words, the cross section size is reduced and the pressure chamber can be formed. Furthermore, since the movable body, which has a rectangular cross section, is supported and housed in a pressure chamber which also has a rectangular cross section, no "rotation" occurs when the movable body is driven. Can be omitted. If omitted, the space needed to support and accommodate the multi-cylinder and slide guide, which was previously required in the base part, is no longer required, creating more space.
Furthermore, since there is no need to drive multiple cylinders, it is possible to save the amount of hydraulic pressure medium accordingly. This also means that the accommodation space for the hydraulic pressure medium is correspondingly smaller.

In this invention, the conventional tank for liquid pressure medium is abolished, and the liquid pressure medium chamber is replaced by a liquid pressure medium chamber in the base part, where the pressure chamber has a rectangular cross section, and an auxiliary multi-cylinder and slide guide are provided. Utilizing the free space created by the omission, a plurality of pressure chambers are formed at front, rear, left and right positions relative to the pressure chamber located at the center on the plane. Conventional tanks required a relatively large capacity, but since the amount of hydraulic pressure medium for multi-cylinder drive can be saved and hydraulic pressure medium chambers are formed in the base body at multiple locations, a large capacity can be used in one location. Although a hydraulic pressure medium chamber with a large capacity cannot be obtained, a hydraulic pressure medium chamber with a "necessary and sufficient capacity" can be formed in the base body.

In this way, the conventional tank was removed from the rear of the press body, which reduced the floor area of the press body and made it easier to clean the room.
It is of a suitable size, and the vertical height of the press body does not change even though it has a built-in hydraulic medium chamber, so there is no need to increase the overall height of the press device. The mold used can be easily replaced, and a small forklift with a short reach can be used instead of the conventional forklift with a long reach to easily replace the mold.

Furthermore, the multiple hydraulic pressure medium chambers that are integrally provided around the pressure chamber have a rectangular shape that also serves to reinforce the side pressure walls of the pressure chamber, which have lower pressure resistance than circular ones. The fact that the side pressure walls can be made thinner also contributes to the miniaturization of the entire device.

Embodiments Next, embodiments of the present invention will be described with reference to the drawings. The drawing shows a press device 1 for resin sealing molding for sealing resin into an IC lead frame as a press device. A pressure chamber 5 having a rectangular cross section and supporting and accommodating a rectangular movable body 4 that can freely move forward and backward in the vertical direction.
It is equipped with.

As shown in FIG. 3, the base portion 3 has a substantially rectangular plane, and the pressure chamber 5 is recessed in the base portion 3 at the center of this plane. The depth of the recess is appropriately set according to the upward stroke of the movable body 4.

A pair of liquid pressure medium chambers 6 are recessed in the periphery of the pressure chamber 5, that is, in four places on the front side A, rear side B, left side C, and right side D of the base part 3, similar to the pressure chamber 5, and each liquid pressure The medium chambers 6 and the hydraulic pressure medium chamber 6 and the pressure chamber 5 are connected to each other via a passage 7 for supplying and discharging a hydraulic pressure medium ("oil" in this embodiment) to and from the pressure chamber 5.

A hydraulic unit 8 is connected to the press body 2 in order to control the supply and discharge of a hydraulic pressure medium to the pressure chamber 5, to control the forward and backward movement of the moving body 4, and for other operations, but in order to make this connection convenient, Bottom part 9 of base part 3
is provided with a plurality of ribs 10 protruding toward the center from the front and rear, left and right sides A, B, C, and D.
A passage 11 for a hydraulic pressure medium is formed in the base part 3 so that the hydraulic unit 8 can be easily connected to this passage 11 no matter where it is placed around the base part 3. In the illustrated example, the passage 11 is formed in the rib 10 facing toward the center from the rear side B, and the passage 11 is connected to the hydraulic unit 8 (see FIG. 1) disposed on the right side from the front side A of the press body 2. can be easily connected via a flange portion 12 formed on the rear side B of the base portion 3 [and the rear side B of the bottom surface portion 9].

In addition, in the figure, 13 is an upper frame, 14 is a support column,
Numeral 15 is a nut for attaching the column 14 to the column attachment hole 16 of the base part 3, 17 is a work table which is attached to the end face of the movable body 4, 18 is an upper mold, and 19 is a nut. The lower molds are each shown. Further, reference numerals 20, 21, and 22 are electrical control devices that are combined and integrated with the press body 2.

In this press device 1, the tank conventionally attached to the rear side B of the press body 2 is omitted, and instead, a hydraulic pressure medium chamber 6 is formed in the base portion 3. Since the press body 2 is also integrated into the press body 2, the floor area is reduced accordingly. Therefore, the area of the work table 17 and the floor area of the press body 2 are approximately the same.

Effects of the Invention Since the press apparatus according to the present invention has the contents as described above, many effects can be expected. The main ones are listed below.

(i) Since the cross-sectional shape of the advancing and retracting body is square, and the cross-sectional shape of the pressure chamber is also square, no rotational motion is added to the advancing and retreating motion of the advancing and retreating body, (ii) (i) Therefore, the auxiliary multi-cylinder and slide guide that were indispensable in the past can be omitted, which frees up space at the base of the press body, and eliminates the need for hydraulic pressure medium to drive the multi-cylinder, resulting in quantitative savings. However, it is possible to
The capacity of the tank for storing the liquid pressure medium can be reduced, and the weight of the press body can also be reduced. (iii) The hydraulic pressure medium chamber is built into the base of the press body, eliminating the need for a conventional tank and saving space at the rear of the press body. The tank can be opened widely, and the tank that was an obstacle to mold replacement has been removed, so mold replacement can be done easily with a small forklift with a short reach, and the labor of mold replacement is simplified. The time can be shortened, and (iv) and (iii) the conventional tank can be omitted and the floor area of the press body can be reduced accordingly, and the press device according to the present invention can be installed in a clean room. When applied, the installation space is smaller compared to conventional ones, contributing to the economy of the clean room. Because of its shape, it also serves as reinforcement for the side pressure walls of the pressure chamber, which have lower pressure resistance than circular ones, and it also contributes to the miniaturization of the entire device in that the side pressure walls of the pressure chamber can be made thinner. And (vi) (i) to (v) can provide a press device that can be expected to have a synergistic effect, is easy to use, has a small overall size, and has a small floor area.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the entire press apparatus according to the present invention, FIG. 2 is a side view showing the press body of the press apparatus shown in FIG. 1, and FIG. 3 is a view of the base portion of the press body. FIG. 4 is a schematic cross-sectional view taken along the arrow line in FIG. 3, and FIG. 5 is a bottom view of the base shown in FIG. 3. FIG. 1...Press device, 2...Press body, 3...
Base part, 4...Movement moving body, 5...Pressure chamber, 6...
...Liquid pressure medium chamber, 7, 11...Passage, 8...Hydraulic unit, 10...Rib, 12...Flange portion.

Claims (1)

[Scope of Claims] 1. A moving body having a rectangular cross-sectional shape is supported and moved freely in a pressure chamber having a rectangular cross-sectional shape, which is recessed in the base portion of the press body.
The base part has a hydraulic pressure medium chamber which can freely supply and discharge hydraulic pressure medium to and from the pressure chamber under the control of an external hydraulic control unit. 1. A press device characterized in that a plurality of recesses are provided so as to surround each other axially and symmetrically.