JP3448584B1 - Press block for press device - Google Patents

Abstract

A pressurizing surface of a pressurizing block for a pressurizing device that is heated becomes convex when pressurized due to thermal expansion, and the yield of a pressurized body is reduced. SOLUTION: A pressure block 41 for a laminated sheet pressure device.
In the above, the elastic member 17 to be brought into contact with the laminated sheet 40
And a peripheral portion 17a of the elastic member for accommodating the elastic member.
And a pressing plate 16 for fixing the elastic member 17, and a pressing surface 17 b of the elastic member 17 on the laminated sheet 40 has a concave shape when not heated and becomes flat when pressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressurizing block used in a pressurizing device for pressurizing an object to be pressed, and particularly to a pressurizing device for pressing a laminated sheet for obtaining a laminated ceramic capacitor or the like. Regarding the pressure block.

[0002]

2. Description of the Related Art For example, in order to manufacture a chip-shaped monolithic ceramic capacitor, a pressurizing device presses a laminated sheet (green sheet) formed by superposing ceramic films having a large number of electrodes provided by printing or the like. After heating and integration, the laminated sheet is cut into chips by a cutting device. Thereby, a monolithic ceramic capacitor can be obtained. In such a pressurizing device, a pressurizing block that is heated and contacts the laminated sheet from above and pressurizes it is used.

FIG. 5 shows a cross section of a conventional pressure block. As shown in FIG. 5, the pressure block 1 includes a pressure plate 2 held by the upper mold of the pressure device.
And a plate-shaped elastic member 4 housed in the housing recess 3 of the pressure plate. The elastic member 4 is molded, for example, by placing a rubber material in the recess 3 and subjecting it to vulcanization.
In this case, the peripheral edge portion 4b of the elastic member 4 is the wall surface 3a of the recess 3.
It is vulcanized and bonded. The elastic member 4 has a flat pressing surface 4a at room temperature.

Such a pressure block 1 is first heated, for example, via a heater embedded in a hot plate of the upper mold in order to press the laminated sheet arranged in the lower mold of the pressure device, When the temperature reaches a predetermined temperature, the lower die moves downward to press the laminated sheet while contacting the laminated sheet.

[0005]

By the way, when such a conventional pressure block 1 is used, a predetermined pressing force is not applied to the peripheral portion of the laminated sheet, so that a desired yield can be achieved. It was difficult. Then, as a result of diligent study by the inventor of the present application, the following was found. That is,
Since the elastic member 4 thermally expands due to heating, its central portion bulges downward from the recess 3 of the pressure plate 2,
Since the peripheral edge portion 4b is bonded to the wall surface 3a of the recess 3, it does not swell. That is, it has been found that the pressing surface 4a of the elastic member 4 swells to a convex shape by heating as shown by the phantom line in FIG. 5, even if the pressing surface 4a of the elastic member 4 is flat when not heated. did.

If such a convex pressing surface 4a comes into contact with the laminated sheet during pressing, it becomes impossible to apply a uniform pressure to the entire surface of the laminated sheet. That is, it is possible to apply uniform pressure to the central portion of the laminated sheet, but it is not possible to apply sufficient pressure to the peripheral portion. Therefore, the desired yield as described above cannot be obtained. As a result of actual measurement, it has been found that the elastic member 4 expands more greatly as the temperature thereof increases due to heating, so that the yield of the manufactured laminated sheet further decreases. Therefore, a pressure block capable of increasing the yield of laminated sheets is desired.

[0007]

The present invention employs the following configurations. <Structure> A pressurizing block for a pressurizing device according to the present invention is a pressurizing block that is heated to apply a pressing force to an object to be pressed, and an elastic member to be in contact with the object to be pressed, A pressing plate for accommodating the elastic member and fixing the side surface of the elastic member, and the pressing surface of the elastic member for pressing the pressed member has a concave shape when not heated. Is characterized by becoming flat when pressure is applied.

<Operation> In the pressure block for the pressure device according to the present invention, the pressure surface of the elastic member is formed in a concave shape when not heated. Then, since the elastic member bulges due to heating when the object to be pressed is pressed, the pressing surface becomes flat. As a result, the entire surface of the body to be pressed can be pressed uniformly, so that the yield can be increased.

A laminated sheet can be used as the body to be pressed, and a rubber material can be formed as the elastic member. The side surface of the elastic member may be vulcanized and adhered. Thereby, the laminated sheet can be manufactured with high yield.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view showing a pressure block for a pressure device according to the present invention. Pressure block 4
1 is a pressure plate 16 as shown in FIG.
And an elastic member 17. Pressure plate 16
Has a housing recess 16a located on the lower surface side thereof.

The elastic member 17 is housed in the recess 16a and has a peripheral edge 17a bonded to the wall surface 16b of the recess.

The elastic member 17 is molded by placing a rubber material in the recess 16a and vulcanizing it. In this case, the peripheral portion 17a is vulcanized and adhered to the wall surface 16b of the recess 16a by this vulcanization treatment. It should be noted that a separate elastic member may be fixed to the wall surface of the accommodation recess 16a using an adhesive or the like.

The elastic member 17 also has a concave lower surface, that is, a pressing surface 17b. As shown in FIG. 1, the pressurizing surface 17b has a central portion which is recessed upward from a horizontal plane (an imaginary line in the drawing) that connects the lowermost ends of the recesses 16a and a lowermost end of the recesses 16a from the central portion. It is formed with a circular arc-shaped peripheral portion. Such pressure surface 1
The concave dimension of 7b with respect to the horizontal plane can be calculated based on the material of the elastic member 17, the thickness in the vertical direction, the coefficient of thermal expansion, and the heating temperature applied at the time of pressurization. It is desirable to form the pressure surface 17b according to the above. In the following example, such measurement data is shown.

FIG. 2 shows the correspondence between the surface temperature of the elastic member and the expansion thickness when the elastic member is made of silicone rubber having a Shore A hardness of 70 ± 10 and the thickness h at room temperature is set to 10 mm. It is a graph which shows a relationship. Figure 2
Then, the horizontal axis represents the surface temperature T of the elastic member, and the vertical axis represents
The expansion thickness Δh of the elastic member is shown corresponding to each surface temperature. This Δh is, for example, the thickness h ′ of the expanded elastic member.
, The difference between this h'and the above h.

Referring to FIG. 2, it can be seen that the higher the surface temperature of the elastic member, the larger the expanded thickness. Based on this graph and the predetermined heating temperature of the elastic member, the size of the depression of the pressing surface of the elastic member can be determined. As a result, the pressure surface that is concave when not heated becomes flat when heated to a predetermined temperature, that is, a predetermined pressure temperature. When the pressure block having such a pressure surface is applied to, for example, a pressure device for a laminated sheet, the yield of the laminated sheet is obviously improved.

Hereinafter, a pressure device for a laminated sheet to which the pressure block according to the present invention is applied will be described. FIG. 3 is a cross-sectional view showing a pressure device for a laminated sheet. This pressurizing device includes an upper die 10. This upper mold 10
Has an upper mounting base 11 and a mold body 12. The mounting base 11 has a heat insulating portion 13, and the mold body 12 is mounted on the lower surface of the mounting base 11 via a mounting block 27. A plurality of cartridge type heaters 14 are embedded in the mold body 12, and the temperature sensor 1 is provided between the heaters 14 and 14.
Five are arranged.

A pressure block 41 according to the present invention is provided on the lower surface of the mold body 12. This pressure block 4
1 is fixed to the mold body 12 and preheated by the heater 14.

The mold body 12 is fitted in a frame-shaped side mold 18 so as to be vertically movable. The side mold 18 is suspended on a mounting block 27 via a bolt 19, and the bolt 19 is equipped with a coil spring 20 that elastically presses the side mold 18 downward. A cut die 21 is fixed to the lower portion of the side die 18. The cutting die 21 is formed in a rectangular shape, and the pressurizing plate 16 is vertically movably fitted therein. Then, a cutting blade 22 is formed on the cutting die 21 along the inner surface (pressure plate 16). A vacuum holding cover 23 covers the lower side of the side mold 18 via an O-ring 24. The vacuum holding cover 23 is elastically suspended via a coil spring 28 fixed to a mounting block 27. The side mold 18 is provided with a vacuum suction port (not shown), and the port passes through the side mold 18 and communicates with a suction passage opened at the lower surface of the cut mold 21.

Further, the pressure device of the present invention is provided with a lower mold 30. The lower mold 30 has a heating plate 31, a plurality of cartridge heaters 32 are embedded in the heating plate 31, and a heat insulating portion 33 is provided. A mold body 34 is fixed on the heating plate 31. A plurality of support pins 36 that float and support the plate 35 on which the laminated sheet 40 is placed are embedded in the mold body 34 so as to be able to project. On the other hand, each support pin 3
Clamp pins 26 for sandwiching the plate 35 are located directly above 6, and each clamp pin 26 is attached to the cutting die 21. The laminated sheet 40 is formed by aligning and laminating ceramic films on which a large number of electrodes are printed.

Next, the operation of the pressure device of the present invention will be described. First, the heaters 14 and 3 of the upper mold 10 and the lower mold 30
2 is operated to preheat the mold bodies 12 and 34. As a result, the pressure block 41 is heated to a predetermined temperature. Next, the mounting base 11 of the upper die 10 is moved downward by a lowering mechanism (not shown) to move the vacuum holding cover 23 to the lower die 3
Airtightness is maintained and abutted on the mold body 34 of 0. In this state, the vacuum pump is operated to draw a vacuum between the upper mold 10 and the lower mold 30. Then, the mounting base 11 is further moved downward,
The plate 35 is positioned and fixed by retracting the support pins 36 while pressing the plate 35 with the clamp pins 26.

The mounting base 11 is further moved downward to cut the cutting die 2.
The cutting blade 22 of No. 1 is made to bite into the edge of the laminated sheet 40 to make a rectangular cut, and the downward movement of the die body 12 causes the pressing plate 16 to continue sliding while contacting the inner wall of the cutting die 21. Then, the elastic member 17 is attached to the laminated sheet 4
Abut on 0. This contact state is shown in FIG. 4 described below.

FIG. 4 is a sectional view showing the pressurizing block during pressurization. FIG. 4 shows that the pressure surface 17b 'of the elastic member is changed from the concave surface 17b (see the one-dot chain line in the drawing) to the flat surface when not heated. This flat pressing surface is in contact with the laminated sheet.

Therefore, when the elastic member 17 is further pressed onto the laminated sheet, the laminated sheet 40 is pressed by the pressing surface 17b 'under uniform pressure to be integrated. The yield of the laminated sheet 40 integrated in this way was 90% or more, while it was 50% in the past.

[0024]

According to the pressure block for a pressure device of the present invention, the pressing surface of the elastic member against the body to be pressed has a concave shape when not heated, and is flat when the body to be pressed is pressed. Therefore,
A pressing force can be applied to the entire surface of the body to be pressed. As a result, the yield of the body to be pressed can be significantly improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a pressure block for a pressure device according to the present invention.

FIG. 2 is a graph showing a correspondence relationship between the surface temperature and the thermal expansion thickness of the elastic member according to the present invention.

FIG. 3 is a cross-sectional view showing a pressure device to which a pressure block for a pressure device according to the present invention is applied.

FIG. 4 is a cross-sectional view showing a pressure block for a pressure device at the time of pressurization according to the present invention.

FIG. 5 is a cross-sectional view showing a conventional pressure block for a pressure device.

[Explanation of symbols]

16 Pressure plate 16a accommodation recess 17 Elastic member 17a peripheral part 22 cutting blade 34 Mold body 35 plates 40 laminated sheet 41 Pressure block (Pressure block for pressure device)

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP 2001-353599 (JP, A) JP 2002-1598 (JP, A) JP 2002-1597 (JP, A) JP 2002-11791 (JP, A) JP 2002-59299 (JP, A) JP 62-23733 (JP, A) JP 2000-79611 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B30B 15/02 B28B 3/02 B30B 15/34

Claims (3)

(57) [Claims] 1. A pressure block for a pressure device, which is heated to apply a pressure to an object to be pressed, comprising an elastic member to be in contact with the object to be pressed, and the elastic member. A pressing plate for fixing the peripheral portion of the elastic member, wherein the pressing surface of the elastic member against the pressure target has a concave shape when not heated, and when pressing the pressure target. A pressure block for a pressure device, which is flat. 2. The pressurizing block for a pressurizing device according to claim 1, wherein the object to be pressed is a laminated sheet, and the elastic member is made of a rubber material. 3. The pressure block for a pressure device according to claim 1, wherein the peripheral portion of the elastic member is vulcanized and adhered.