JP3566413B2 - Ceramic perforator - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a ceramic punching device for punching holes in an unfired ceramic body, and more particularly to a ceramic punching device with improved reliability of a pin implanted in an upper punch.
[0002]
[Prior art and its problems]
Conventionally, when a hole is formed in a green ceramic body, a so-called punching die apparatus is generally used. This is generally composed of an upper punch having a punched pin implanted thereon and a lower punch having a diameter corresponding to the outer diameter of the punched pin. An unfired ceramic body is provided between the upper punch and the lower punch. And moving the upper punch until the punching pin of the upper punch is inserted into the through hole of the lower punch, thereby forming a desired hole in the unfired ceramic body.
[0003]
In such a punching die apparatus, the punching pin implanted in the upper punch is made of a hard metal material such as tungsten or its alloy, and is formed into a wire by an injection molding method. For example, a punching pin 50 as shown in FIG. 7 obtained by cutting a surface is known.
[0004]
The punching pin 50 is formed in the upper punch by making the area 50a for punching the unfired ceramic body thinner, making the area 50b to be implanted in the upper punch thicker, and using the step portion 50c of which diameter changes. It can be easily held in the step portion of the through hole. Such a punching pin 50 has the advantage that it can be easily and quickly implanted in the upper punch, and that the replacement operation can be performed very easily.
[0005]
However, the processing of such a punching pin 50 becomes very difficult as the diameter of the area where the punching is performed becomes smaller, thereby increasing the manufacturing cost. There has been a problem that the step portion 50c is likely to be broken by repeated stress. Further, such a shape of the punching pin 50 may be distorted due to stress applied when the punching pin 50 is implanted in the upper punch at the time of its production or maintenance of a punching device for the upper punch. Was easily broken.
[0006]
Therefore, the present invention solves the conventional problems as described above, and can be satisfactorily drilled in an unfired ceramic body for a long period of time, when manufacturing punched pins, implanting in an upper punch, during maintenance, etc. It is another object of the present invention to provide a highly reliable ceramic drilling device in which the punching pin is less likely to break.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a ceramic punch according to the present invention comprises a lower punch having a through hole, and an upper punch in which a pin inserted into the through hole is implanted. A ceramic drilling device for placing a hole in an unfired ceramic body by placing a pin of an upper punch into a through hole of a lower punch while placing an unfired ceramic body therebetween. The outer circumference of the base of the pin having a uniform outer diameter is covered with a cylindrical body, and the outer circumference of the base of the pin and the cylindrical body are fixed to each other via an anaerobic adhesive, and the pin is mainly made of tungsten. The cylindrical body is made of copper or an alloy containing copper as a main component.
[0008]
Also, by covering with such a cylindrical body, if a step is provided in an insertion hole for implanting a pin in the upper punch, implantation can be easily and quickly performed in this insertion hole.
[0009]
Further, the cylindrical body is attached to the pin with an adhesive or caulking. In particular, if an anaerobic adhesive is used as the adhesive, the outer periphery of the pin can be reliably sealed.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment according to the present invention will be described in detail. As shown in FIG. 1, in order to form a desired hole in the unfired ceramic body W, a ceramic punching apparatus S includes an upper punch 2 and a lower punch 2 in which a large number of punching pins (hereinafter, referred to as pins) 1 are implanted. (Die) 3, and a desired hole is formed in the unfired ceramic body W disposed between the upper punch 2 and the lower punch 3. FIG. 1 shows a state where one pin 1 is implanted for simplicity.
[0011]
The upper punch 2 includes a pin plate 4 on which the pin 1 is implanted, a support plate 5 placed on the pin plate 4 to support one end of the pin 1 when the pin 1 is pierced, and a support plate 5 It mainly comprises a back plate 6 disposed above, and a pin guide 7 which guides the pins 1 and is connected by springs 8 and suspension bolts 9. Here, the pin plate 4 is provided with an insertion hole 4a having a step for inserting and supporting the pin 1. The pin guide 7 has an insertion hole 7a into which the lower part of the pin 1 is inserted.
[0012]
The lower punch 3 has a large number of through holes 3a into which the pins 1 of the upper punch 2 are inserted, and functions as guide holes for the pins of the upper punch 2.
[0013]
In the ceramic punching device S configured as described above, the upper punch 2 descends to the unfired ceramic body W disposed on the lower punch 3 and stops the upper punch 2 at a predetermined position. The plate 4 descends toward the lower punch 3 against the urging force of the spring 8, and drills a hole at a desired position of the green ceramic W.
[0014]
Next, the mode of the pin 1 implanted in the upper punch 2 will be described in detail. As shown in FIG. 2, the pin 1 has, for example, an elongated columnar shape having a uniform outer diameter as a whole, and is made of a cemented carbide (for example, a W—Co alloy) containing tungsten as a main component. is there. The upper half (base outer periphery) 1b of the pin 1 is held by the stepped portion of the insertion hole 4a of the pin plate 4, and in order to enhance the bending resistance of the pin 1, copper or copper is used as a main component. It is covered with a tubular body (pipe) 10 made of an alloy. As described above, the pin 1 is made of a cemented carbide mainly containing tungsten, and the pipe 10 is made of an alloy mainly containing copper. This is to prevent the pin 1 from breaking as much as possible, but it has been found that any metal material such as aluminum or its alloy which is softer than a cemented carbide having a Vickers hardness of 100 Hv or less can be used. However, a metal harder than tin, that is, a Vickers hardness of 10 Hv or more is required. Note that the upper end 1a of the pin 1 protrudes from the pipe 10 for the reason described later.
[0015]
As shown in FIG. 3, the outer periphery 1 b of the base of the pin 1 and the pipe 10 are fixed via an anaerobic adhesive 11. The anaerobic adhesive 11 is mainly composed of a known material such as a polyether such as tetraethylene glycol dimethacrylate or a dimethacrylate such as polyester, and various types such as an instantaneous type, a heat-resistant type, and a structural type are used. It is possible. Here, the pipe 10 may be fixed to the pin 1 only by caulking without using an adhesive.
[0016]
The pin 1 of such an embodiment is inserted into the insertion hole 4a of the pin plate 4 from which the support plate 5 has been removed, and is implanted. As shown in FIG. The lower end 10 a of the pipe 10 is locked by a step 4 b formed in the insertion hole 4 a of the pin plate 4.
[0017]
On the other hand, as shown in FIG. 4B, the upper end 1a of the pin 1 projects slightly from the pipe 10, and this upper end 1a is completely in contact with the lower surface 5a of the support plate 5 when the pin 1 is pierced. Then, a force for lifting the support plate 5 upward is generated.
[0018]
Therefore, if such a pin 1 is inserted and supported in the insertion hole 4 having a stepped portion of the pin plate 4, the upper plate 2 is provided between the upper end 1 a of the pin 1 and the support plate 5 when the upper punch 2 is pierced. Although stress is generated, no stress is generated between the pipe 10 and the support plate 5. Further, when the upper punch 2 moves upward after the drilling, only a very weak stress is generated between the step 4b of the insertion hole 4a of the pin plate 4 and the lower end 10a of the pipe 10, so that the pin 1 is Can last longer.
[0019]
Next, the point that the pin 1 of the ceramic punching device S of the present invention has significantly improved bending resistance as compared with the pin 50 of the conventional ceramic punching device will be described. The tip of each pin is pressed against the base, and the axis of the pin when it is straight and the center of the pin tip when the pin is bent from the center of the pin tip to the lower end of the pipe 10 (or the step portion 50c where the diameter of the pin changes). When the angle between the straight line and the straight line breaks, the conventional pin breaks at the step 50c of the pin 50 at an angle of approximately 10 ° with the axis of the pin 50 as shown in FIG. occured.
[0020]
On the other hand, as shown in FIG. 6, it was found that the pin 1 according to the present invention did not break until approximately 25 ° from its axis, and would not break unless it was bent considerably more than a conventional pin. In the case where the pin 1 according to the present invention breaks, the break occurs slightly above the lower end of the pipe 10. In the case where the pipe 10 is fixed to the outer periphery of the pin 1 by caulking, for example, it is possible to improve the bending resistance by providing a small gap at the lower end of the pipe without caulking.
[0021]
The pins, the tubular body covering the pins, and the adhesive are not limited to the materials of the above-described embodiment. For example, the tubular body may be a known metal material having a Vickers hardness of 100 Hv or less, and the adhesive is preferably an anaerobic adhesive in terms of ease of handling, but other various adhesives may be used. Can be changed as appropriate without departing from the scope.
[0022]
【The invention's effect】
As described above, according to the ceramic perforating apparatus of the present invention, it is possible to pierce the unfired ceramic body satisfactorily for a long period of time. It is possible to provide a highly reliable ceramic drilling apparatus in which the pins are not easily broken at the time of installation, maintenance of the upper punch, etc.
[0023]
Further, since the outer periphery of the pin having a uniform outer diameter is covered with the cylindrical body, processing such as cutting work as in the related art is not required, and the pin can be manufactured extremely easily and quickly.
[0024]
Furthermore, since the pin is made of a cemented carbide containing tungsten as a main component and the cylindrical body is made of copper or an alloy containing copper as a main component, the two metals are well-adapted, and the pin receives a force such as vibration. Also, breaking of the pin is prevented as much as possible.
[Brief description of the drawings]
FIG. 1 is a schematic sectional view showing an embodiment according to the present invention.
FIG. 2 is a plan view showing one embodiment of a pin according to the present invention.
FIG. 3 is an enlarged vertical sectional view of the pin shown in FIG. 2;
FIG. 4A is a partial cross-sectional view showing a state in which a pin is supported by an insertion hole of a pin plate, and FIG. 4B is a partial cross-section showing a state of an upper end portion of the pin in the insertion hole of the pin plate. FIG.
FIG. 5 is a view showing the bending resistance of a conventional pin.
FIG. 6 is a view showing the bending resistance of the pin according to the present invention.
FIG. 7 is a plan view showing an example of a conventional pin.
[Explanation of symbols]
1: punching pin (pin)
2: Upper punch 3: Lower punch 4: Pin plate 5: Support plate 10: Cylindrical body (pipe)
11: Anaerobic adhesive S: Ceramic punch

Claims (1)

A lower punch having a through-hole; and an upper punch having a pin inserted into the through-hole. An unfired ceramic body is disposed between the lower punch and the upper punch. Is inserted into the through-hole of the lower punch to form a hole in the unfired ceramic body, wherein the outer periphery of the base of a pin having a uniform outer diameter to be implanted in the upper punch is formed in a cylindrical body. And the base outer periphery of the pin and the cylindrical body are fixed to each other via an anaerobic adhesive, the pin is made of a cemented carbide mainly containing tungsten, and the cylindrical body is made of copper. Alternatively, a ceramic drilling device is made of an alloy containing copper as a main component .

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