JPH11309516A - Plate knurling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transfer knurling teeth in a specified area of a plate by machining uneven teeth capable of transferring the knurling teeth on surfaces opposite to each other of a pair of annular plates. SOLUTION: A knurling device 1 is provided with a pair of transfer dies 10, 20 to press and transfer knurling teeth on annular plates 2 arranged between both panels P1, P2 of a press and support bases 11, 21 to support and fix the transfer dies 10, 20 on the press. The transfer dies 10, 20 are provided with a pair of annular plates 12, 22 at the positions opposite to each other on the both panels P1, P2 of the press and uneven teeth capable of transferring the knurling teeth are machined on the surfaces opposite to each other of a pair of these annular plates 12, 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knurl processing apparatus for processing knurls on a plate material such as an annular material disposed between disk-shaped resistors in a gas circuit breaker by using a press machine, and a knurl processing apparatus. Regarding plate materials.

[0002]

2. Description of the Related Art When irregularities called "seven eyes" or "knurls" are cut into a plate material, the flatness of the plate material is improved and the strength of the plate material itself is increased. It can be applied as a cushioning material against an impact load applied therebetween, a reinforcing material for frictional resistance to a contact member, or the like.
This example is shown in FIG.

FIG. 6 shows a gas circuit breaker (also referred to as a "resistance breaker") 100 used in a high-voltage power system or the like. The circuit breaker 100 includes a main contact (arc-extinguishing chamber) 101 and an overvoltage suppressing resistance contact 102 connected in parallel to the main contact (arc-extinguishing chamber). 103 are connected in series. Each of the resistors 103... 103 is usually made of ceramics and manufactured by a powder metallurgy method. Therefore, the circular flatness of the resistors 103 is not uniform, and if they are brought into direct contact with each other, the electric resistance characteristics deteriorate.

As a countermeasure against this, a plurality of annular plates (aluminum foil) 104... 104 are incorporated between the adjacent two resistors 103, 103 as a plate having the above-mentioned irregularities. The respective plate members 104... 104 improve the contact between the resistors 103, 103 to exhibit more excellent electric resistance characteristics.

The plate member 104 also functions as a cushioning material when an impact load is applied to the resistor 102,
In addition to preventing damage to the 04 and its surrounding components,
Since the frictional resistance is larger than that of a flat plate having no irregularities, there is an advantage in that the resistors 103 are relatively unlikely to slip through each other, and the occurrence of misalignment can be suppressed.

FIG. 7 shows an example of a knurling apparatus for such a plate material 104.

[0007] The knurling machine shown in FIG. 7 uses a general-purpose press machine to machine knurls on the front and back of a plate material 104, and supports 11 on a platen P1 of the press machine.
The transfer mold 110 is attached via the support member 111a, and the elastic material 111 such as urethane rubber is attached via the support member 111a to the pressure plate P2 facing the transfer mold 110.
(The reference numerals 112 and 113 in the figure indicate guide posts and guide bushes for positioning guide).

[0008] In such a processing apparatus, the elastic material 115 is lowered toward the plate material 104 placed on the upper surface of the transfer die 110 by a press machine, and is pressed.
The knurls are transferred to the entire area of No. 4 (see the double-dot chain line arrow in the figure). Plate material 10 obtained by this knurling device
FIG. 8 shows an example of No. 4.

[0009]

However, in the above-described conventional knurling apparatus, the knurls cannot be transferred to a predetermined area of the plate material, and (2) the plate thickness of the plate material is lowered by the press machine. Since it is determined by the stroke length and the properties of the elastic material such as hardness, the management tends to be generally unstable. (3) Since the inner and outer peripheral edges of the plate material and the irregularities of the transfer mold interfere with each other, (4) It is difficult to uniformly and accurately align the height of the front and back of the knurled eyes with reference to the center of the thickness of the plate material. And so on.

The present invention has been made in view of such a conventional problem, and has as its first object to transfer knurls to a predetermined region of a plate material.

It is a second object of the present invention to more stably manage the sheet thickness without depending on the descending stroke length of the press machine or the hardness of the elastic material.

A third object of the present invention is to prevent interference between the unevenness of the transfer die and the edge of the plate material to prevent the loss thereof.

Further, according to the present invention, the height of the front and back sides of the knurled eyes is made uniform with respect to the center of the thickness of the plate material,
A fourth object is to improve the accuracy.

[0014]

In order to achieve the above object, a knurl processing apparatus according to the present invention comprises: a transfer die for press-transferring knurls onto an annular plate disposed between both plates of a press machine; And a support for supporting and fixing the transfer die on the press machine, wherein the transfer die comprises a pair of annular plates arranged at positions facing each other on both boards of the press machine. The knurls can be transferred on the respective opposing surfaces of the pair of annular plates.

According to a second aspect of the present invention, the annular plate is an annular plate having an inner diameter larger than the plate member and an outer diameter smaller than the inner diameter.

According to a third aspect of the present invention, the irregularities of the pair of annular plates are processed with a predetermined dimensional accuracy. As a result, highly accurate fine knurls can be transferred to the plate material.

According to a fourth aspect of the present invention, the concave and convex portions of the pair of annular plates are formed so as to be meshable with each other. Thereby, the knurls can be uniformly transferred to the front and back of the plate material.

According to a fifth aspect of the present invention, in the first aspect of the invention, each of the concavities and convexities of the pair of annular plates is formed by electric application processing.

In the invention according to claim 6, the transfer type is:
Radially inside and outside the pair of annular plates,
A plate holding mechanism for pressing the plate material so as to uniformly transfer the knurls based on the center of the thickness of the plate material is provided.

According to a seventh aspect of the present invention, the plate holding mechanism includes a positioning portion for positioning by fitting the plate material. As a result, the knurls can be processed more accurately in a certain area of the plate material.

According to an eighth aspect of the present invention, there is further provided a stroke end block for controlling the thickness.

According to a ninth aspect of the present invention, there is provided a plate material processed by using the knurling device according to any one of the first to eighth aspects.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a knurling apparatus according to the present invention will be specifically described below with reference to the drawings.

The knurling machine 1 mounted on the press machine shown in FIG. 1 is used for forming an annular plate 2 having a predetermined thickness such as an annular material inserted between the annular resistors of the gas circuit breaker. The present invention is applied to an apparatus for processing irregularities such as knurled irises (hereinafter collectively referred to as “knurled eyes”).

The processing apparatus 1 includes a pair of lower dies 10 and upper dies 20 mounted on both plates of a press machine, ie, a platen P1 and a press platen P2 thereof. The plate material 2 placed on the lower die 10 is pressed by the upper die 20 by a press operation, and knurls are transferred to the front and back of the plate material 2 in a fixed annular pattern. Here, plate 2
Is set in an annular region excluding the inner and outer peripheral edges of the plate material 2.

The lower die 10 includes a support table 11 mounted on a surface plate P1, an annular plate 12 mounted on the support table 11 by a fastening screw a1, and a radially inner side of the annular plate 12 on the holding body 11. And two pressing members which are vertically movably attached to the outer and outer positions via the bottom dead center blocks 13b, 13b by the adjusting screw b1, the spring b2, and the spring adjusting screw b3, that is, the inner peripheral pressing plate 14a and the outer peripheral portion. And a holding plate 14b. Of these, a circular convex portion 15 for holding a plate material having a diameter that can be fitted into the hollow portion of the annular plate material 2 is formed on the upper surface of the inner peripheral side holding plate 14a.

The upper die 20 has the same structure as the lower die 10, that is, a support 21 mounted on the pressurizing plate P2, an annular plate 22 mounted on the support 21 by a fastening screw a1, and a holder 21. Annular plate 2 on top
Adjustment screw b1 and spring b at both the radially inner and outer positions
2. Bottom dead center block 2 by spring adjustment screw b3
It is composed of two pressing plates mounted to be vertically movable via 3a and 23b, that is, an inner pressing plate 24a and an outer pressing plate 24b. Of these, a circular concave portion 25 is formed on the upper surface of the inner peripheral side press plate 24a by relief processing to prevent interference with the convex portion 15 of the central press plate 14a in the lower die 2.

The upper and lower annular plates 12 and 22 are made of a high-hardness annular iron net material that has been subjected to a heat treatment to prevent abrasion damage, and have a radial width smaller than that of the plate material 2. High-precision knurls are formed on the upper surfaces of the annular plates 12 and 22 by wire-cut electric discharge machining so that the knurls are uniformly meshed over the entire area when transferred to the plate material 2.

Upper and lower holding plates 14a, 14b, 24
a and 24b uniformly press the inner and outer peripheral ends of the plate material 2 by the spring pressures of the adjusting screw b1, the spring b2, and the spring adjusting screw b3, and are set in advance based on the length of the downward pressing stroke of the press machine. Distance (h1 and h2 in the figure)
), And can be moved up and down, and can be pressed against the plate material 2 over the entire circumference at the same pressure.

Upper and lower bottom dead center blocks 13a, 13b, 2
3a and 23b are for controlling the length of the descending pressurizing stroke of the press machine to protect the upper and lower annular plates 12 and 22. The thickness of the bottom dead center block is set so that the upper and lower central holding plates 14a and 14b do not interfere with each other even if the descending press stroke length of the press machine is incorrectly set, for example. .

On the two support bases 11, 21, replaceable stroke end blocks 16, 26 capable of managing and controlling the thickness of the plate material 2 and its unevenness are provided at several places by tightening screws a1, a1. Installed.

Further, on the two support tables 11 and 21,
A guide post 17 and its guide bush 27 are attached as a guide mechanism for accurately guiding the upper die 20 to the lower die 10 on the surface plate P1 when the pressurizing plate P2 descends.

Next, the overall operation of this embodiment will be described with reference to FIGS.
A description will be given based on FIG.

First, as shown in FIGS. 2 and 3, an annular plate 2 is prepared. The plate material 2 is fitted and installed in the convex portion 15 of the central pressing plate 14a of the lower die 10 of the knurling device, and the press machine is started. At the time of this start, the upper die 20 descends together with the pressurizing plate P1, and the guide bush 27 is inserted into the guide post 17 in accordance with the position, thereby guiding the upper die 10 to a predetermined position of the lower die 20 (FIG. 1 (see double-pointed arrow A).

Then, by pressing the plate material 2 placed on the lower mold 10 with the upper mold 10 and pressing, the upper holding plates 14a and 14b move upward and the lower holding plates 24a and 24b move downward. It moves evenly. As a result, the knurls aligned at the same height up and down with respect to the center of the plate thickness of the plate 2 are transferred to a fixed region of the plate 2, that is, the region in contact with the annular plates 12 and 22, while the inner and outer peripheral edges of the plate 2 are Parts, ie, the center holding plates 14a, 24
No knurls are transferred to the area that comes into contact with the outer peripheral end of “a” and the inner peripheral ends of the outer peripheral holding plates 14b and 24b.

When the lowering / pressing in such a press machine is completed, the pressing plate P2 is raised to a predetermined position and the plate material 2 is taken out from the knurling device. Thus, the knurling of one plate 2 is completed. The obtained plate 2 is shown in FIGS. 4 and 5.

[0037]

As described above, according to the present invention, (1) knurls can be transferred to a certain area of a plate material,
(2) The plate thickness can be controlled more stably without depending on the descending stroke length of the press machine, the hardness of the elastic material, and the like. (3) The interference between the unevenness of the transfer die and the edge of the plate material is suppressed. (4) The height of the front and back sides of the knurled eyes can be made uniform with reference to the center of the plate thickness of the plate material, and the accuracy can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional front view showing an embodiment of a knurling apparatus for a plate material according to the present invention.

FIG. 2 is a front view of the plate before knurling.

FIG. 3 is a right side view of FIG. 2;

FIG. 4 is a front view of the plate after knurling.

FIG. 5 is a right side view of FIG. 4;

FIG. 6 is a schematic cross-sectional view showing a main part structure of a conventional gas circuit breaker.

FIG. 7 is a schematic sectional front view showing an example of a conventional plate material knurling apparatus.

FIG. 8 is a front view of a plate material obtained by conventional knurling.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Knurling apparatus 2 Annular plate material 10 Lower die 11 Support base 12 Annular plate 13a, 13b Bottom dead center block 14a Inner peripheral part holding plate 14b Outer peripheral part holding plate 15 Convex part 16 Stroke end block 17 Guide post 20 Upper mold 21 Support Table 22 Annular plate 23a, 13b Bottom dead center block 24a Inner peripheral pressing plate 24b Outer peripheral pressing plate 25 Depressed portion 26 Stroke end block 27 Guide bush P1 Platen (press machine) P2 Pressure plate (press machine) a1 Tightening screw b1 Adjustment Screw b2 Spring b3 Spring adjustment screw

Claims (9)

[Claims] 1. A processing apparatus comprising: a transfer die for press-transferring knurls onto an annular plate material disposed between both plates of a press machine; and a supporter for supporting and fixing the transfer die on the press machine. The transfer die includes a pair of annular plates disposed at positions facing each other on both boards of the press machine, and the knurls can be transferred onto respective opposing surfaces of the pair of annular plates. A knurling machine for plate materials, characterized by processing various irregularities. 2. An apparatus according to claim 1, wherein said annular plate is an annular plate having an inner diameter larger than said plate and an outer diameter smaller than said plate. 3. The knurling apparatus according to claim 1, wherein the concave and convex portions of the pair of annular plates are processed with a predetermined dimensional accuracy. 4. A knurling apparatus for a plate material according to claim 1, wherein irregularities of said pair of annular plates are formed so as to be meshable with each other. 5. The knurling apparatus for a plate material according to claim 1, wherein each of the irregularities of the pair of annular plates is formed by an electric application process. 6. The transfer die according to any one of claims 1 to 5, wherein the transfer die is provided radially inward and outward of the pair of annular plates with reference to a plate thickness center of the plate material. A knurling apparatus for a plate material, comprising: a plate pressing mechanism for pressing the plate material so as to transfer the knurls evenly. 7. The knurling apparatus for a plate material according to claim 6, wherein the plate holding mechanism includes a positioning portion for positioning the plate material by fitting the plate material. 8. The knurling apparatus for a sheet material according to claim 1, further comprising a stroke end block for sheet thickness management. 9. A plate material processed by using the knurling device according to claim 1. Description: