KR20160114933A - Realization skill of pattern processed through a punching device - Google Patents

Abstract

The present invention aims to provide a patterning technology using a punching apparatus and effects thereof, which form dots of patterns to be overlapped or to come in contact with each other and to be deep, reduce noise and vibration generated when a compressor operates, and improve abrasion resistance due to a protruding unit. The present invention relates to a patterning technology using a punching apparatus and effects thereof for a valve plate in which a pattern is formed around the surface of an outlet and an inlet by using the punching apparatus. According to the present invention, the pattern is made of a plurality of lines made of dots in a certain shape formed along the circumference of the outlet and the inlet at regular intervals; the plurality of lines are distanced from each other away from the outlet and the inlet of the valve plate and the distance between the lines is great when the lines are far from the outlet and the inlet; and the dots are 30-200 m deep and are in contact with each other or are overlapped with each other.

Description

[0001] The present invention relates to a punching machine,

[0001] The present invention relates to a pattern embodying technique and an effect obtained by a punching machine. More particularly, the present invention relates to a pattern embodying technique that is implemented by a punching machine for forming a proper pattern by punching a rotary pin around a discharge port and a suction port of a compressor valve plate, And effects.

In general, a piston type compressor such as an inclined plate type compressor is formed by partitioning a cylinder, a suction chamber, and a discharge chamber with a valve plate interposed therebetween. A suction groove is formed in the valve plate at a position facing the suction chamber, And discharge grooves are respectively formed in the through holes.

A suction valve is disposed on the cylinder-side surface of the valve plate, and a discharge valve is disposed on the suction chamber and the discharge chamber-side surface, respectively. The suction valve has a suction lead portion at a position corresponding to the suction groove, And has a discharge lead portion at the position.

In operation of the compressor, the suction lead portion of the suction valve and the discharge lead portion of the discharge valve open / close the suction groove and the discharge groove of the valve plate in accordance with the reciprocating motion of the piston. Since the lubricating oil component contained in the refrigerant adheres, The lid portions are strongly adhered to the surface of the valve plate.

Therefore, it is known that instantaneous pressure fluctuation occurs when the suction groove and the discharge groove are opened or closed, causing an abnormal sound of the evaporator connected to the compressor, or adding an impact sound of the lead portion, thereby promoting noise and vibration.

Therefore, in order to reduce noise and vibration, a method has been proposed in which the surface of the valve plate is processed into a predetermined pattern and roughed to realize quietness.

Noise and vibration due to opening and closing of the suction valve and the discharge valve can be suppressed by roughening the surface of the valve plate. In the conventional roughening, a shot blasting method of spraying short particles of alumina or the like with air pressure is widely used.

The shot blast method masks the valve plate surface to spray shot particles, and then rinses the valve plate surface.

However, even if the valve is cleaned, there is a risk that the cutting particles on the surface of the valve plate cut by the short particles or the short particles themselves remain on the valve plate surface as foreign matter. If such foreign matter is mixed in the compressor, It caused the malfunction.

In addition, there is a problem that the machined surface of the surface is sharper, sharp and worn easily, and the surface of the machined surface is lowered than the existing surface, thereby increasing the possibility that the function of the pocket in which the oil stays is lost.

To solve this problem, a pattern for roughening was formed on the surface by a pressing method.

In this press-forming method, a pattern for roughening is previously formed in a metal mold at an intaglio angle, and the valve plate is pressed using a press apparatus to form a pattern for roughening in a necessary portion.

However, this press-forming method has a drawback in that it is difficult to realize various shapes for noise reduction and performance improvement because there is a possibility that peripheral portions are flexibly deformed at the time of pressurization and the types of patterns that can be formed in the mold are limited .

Korea Patent No. 10-0536790

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide an ink jet recording head capable of minimizing noise and vibration during operation of a compressor, And to provide a patterning technique and an effect which are processed by a punching machine.

In order to achieve the above object, the present invention provides a valve plate having a pattern formed around a discharge port and a suction port by using a punching device, Wherein the lines are spaced apart from each other in a direction away from the discharge port and the suction port of the valve plate, and the interval between the discharge ports and the suction port is larger than the interval between the discharge port and the suction port And the dots have a depth of 10 to 200 mu m and are formed to be in contact with or overlap with each other.

A first section formed along the outer periphery of the discharge port and the suction port and having no line formed therein; A second section in which a plurality of lines are formed outside the first section; A third section in which a plurality of lines are formed outside the second section, the interval between the lines being larger than the interval between the lines in the second section; .

The dot is formed in a conical shape.

The dots are formed in the shape of hexagonal horns.

A first first protrusion is formed on the outer side of the dot along the circumference of the dot by a pressing force at the time of dot processing.

When the dots are disposed to be in contact with each other, a second protrusion is protruded from the shortest adjacent portion between the dots.

When the dots are arranged to overlap with each other, a third projection is protruded between the overlapped dots.

In order to achieve the above object, a method of patterning a valve plate using a punching machine according to the present invention is a method of patterning a valve plate using a punching machine for horizontally and vertically moving a tangential pin, A method of forming a pattern, wherein when the dots are arranged so as to be in contact with each other, the horizontally moving distance of the tangential pins per punching is set to be equal to the diameter of the dots, and the dots are formed so as to be overlapped with each other The horizontal movement distance of the tangential pin per one punching is set to be shorter than the diameter of the dot.

The patterning technique and effect produced by the punching machine of the present invention as described above have the following effects.

When the compressor is operated, it has the effect of reducing the noise generation compared to the conventional valve plate and has a high abrasion resistance, so that the noise increase can be minimized even when the compressor is used under severe conditions for a long time.

1 is a perspective view of a punching machine and a valve plate according to an embodiment of the present invention,
2 is a planar structural view of a punching machine according to an embodiment of the present invention,
3 is a plan view of a punching machine according to another embodiment of the present invention
4 is a perspective view of a tangential pin of a punching machine according to an embodiment of the present invention,
5 is a perspective view of a tangential pin of a punching machine according to another embodiment of the present invention,
6 is a partially enlarged plan view of a patterning technique and effects fabricated with a punching machine according to an embodiment of the present invention,
FIG. 7 is a partially enlarged plan view of a pattern embodying technique and effect processed by a punching machine according to another embodiment of the present invention,
FIG. 8 is a partially enlarged plan view of a pattern embodying technique and effect processed by a punching machine according to another embodiment of the present invention,
FIG. 9 is a sectional view taken along line AA of FIG. 6,
10 is a cross-sectional view taken along line BB of Fig. 6,
Fig. 11 is a cross-sectional view taken at CC in Fig. 8,
12 is a table showing noise evaluation values of a conventional valve plate having a pattern embodying technique and effect and a pattern processed by a shot blast method, which are processed by a punching machine according to an embodiment of the present invention.

FIG. 1 is a perspective view of a punching machine and a valve plate according to an embodiment of the present invention, FIG. 2 is a plan view of a punching machine according to an embodiment of the present invention, and FIG. 3 is a plan view of a punching machine according to another embodiment of the present invention. 5 is a perspective view of a tangential pin of a punching machine according to another embodiment of the present invention, Fig. 6 is a perspective view of a punching machine according to an embodiment of the present invention, Fig. FIG. 7 is a partially enlarged plan view of a pattern embodying technique and effect fabricated by a punching machine according to another embodiment of the present invention, FIG. 8 is a plan view showing another embodiment of the present invention FIG. 9 is a cross-sectional view as viewed from AA in FIG. 6, FIG. 10 is a cross-sectional view viewed from BB in FIG. 6, FIG. 11 is a cross-sectional view viewed from CC in FIG. 8, Degree 12 is a table showing noise evaluation values of a conventional valve plate having a pattern embodying technique and an effect of a punching machine according to an embodiment of the present invention and a pattern processed by a shot blast method.

1 to 4, a punching machine according to an embodiment of the present invention includes a seating jig 100, a fixing jig 200, a processing unit 300, and a height adjuster 400.

The seating jig 100 is a jig on which the object to be machined, that is, the valve plate 10 is seated, is mounted on the upper portion of the base frame 500.

The valve plate 10 is used in a compressor or the like. The valve plate 10 is formed in a substantially disc shape, and has a suction port 11 connected to the suction chamber of the cylinder and a discharge port 11 connected to the discharge chamber.

The seating jig 100 is formed in a substantially disc shape and is rotatably mounted on the base frame 500 with a motor M connected thereto.

A seating portion 110 is formed on the upper surface of the seating jig 100 and includes a fixing protrusion 111 inserted into the discharge port 11 and the suction port 11 when the valve plate 10 is seated.

The fixing part 110 includes five fixing protrusions 111 protruding in a circular shape having the same diameter as that of the discharge port 11 and the suction port 11, (11) and the inlet (11), respectively.

Since the seating part 110 formed of the fixing protrusions 111 is formed on the seating jig 100 in this way, the position where the valve plate 10 is fixed is guided to facilitate the operation, It is possible to prevent an arbitrary movement in the horizontal direction, thereby reducing the occurrence of defective products.

In addition, the seating part 110 is disposed concentrically with the center point of the seating jig 100.

The seating jig 100 is rotated at predetermined angular intervals so that any one of the fixing protrusions 111 is disposed below the processing unit 300 to be described later.

More specifically, as shown in FIG. 2, when the seating part 110 is composed of five fixing projections 111, the seating jig 100 is rotated at intervals of 72 degrees, 111 are always arranged at the lower part of the processing unit 300. [

When the seating jig 100 is rotated at a predetermined angle with respect to the center point and the seating unit 110 is disposed concentrically with the center point of the seating jig 100, It is possible to reduce the moving range, shorten the machining time, and produce an effect of precisely machining.

The fixing jig 200 is for pressing the valve plate 10 disposed in the seating jig 100 in a downward direction and fixing it securely to the seating jig 100. Specifically, And a pressurizing cylinder 220.

The pressing plate 210 is disposed at an upper portion of the seating jig 100 and is formed in a substantially rectangular shape and has a length greater than the diameter of the seating jig 100 and a width greater than a diameter of the seating jig 100 And presses a part of the valve plate 10 when the valve plate 10 is lowered.

The pressure plate 210 is vertically moved by the pressure cylinder 220 and contacts the upper surface of the valve plate 10 when the valve plate 10 is lowered so that the valve plate 10 is tightly fixed to the seating jig 100.

The pressure cylinder 220 is a general pneumatic or hydraulic cylinder and is disposed at both sides of the pressure plate 210. The pressure cylinder 210 is installed between the pressure plate 210 and the base frame 500, The pressing plate 210 is lowered to press the valve plate 10 and the seating jig 100 is raised when the seating jig 100 rotates so that the seating jig 100 is rotatable.

Since the fixing jig 200 for pressing the valve plate 10 disposed in the seating jig 100 is provided as described above, the valve plate 10 is prevented from being lifted or released during processing, So that the machining accuracy is improved and the defect rate is lowered.

The processing unit 300 is a device for forming the pattern 20 by bending the surface of the valve plate 10 while moving the tangential pins 310 mounted at the bottom in a horizontal and vertical direction at a constant speed.

More specifically, the processing unit 300 reciprocally moves the tangential pins 310 in the vertical direction about 10 times in about one second such that the tangential pins 310 are horizontally reciprocated in a direction perpendicular to the discharge port 11 and the inlet 11, A plurality of circular concave dots D are formed at a predetermined interval around the discharge port 11 and the suction port 11 to form a pattern 20 by moving the discharge port 11 and the suction port 11 in the order of 10 to 80 mm.

The machining unit 300 drives the X and Y-axis stage stepping motors to move the tangential pins 310, and is driven by a program for machining the patterns 20 by CNC alone.

In addition, the processing unit 300 can adjust the depth of the dot D by adjusting the air pressure during vertical movement.

The processing unit 300 processes the periphery of one of the discharge port 11 or the suction port 11 of the valve plate 10 and then waits while the seating jig 100 rotates by a predetermined angle. When any one of the discharge ports 11 or the suction port 11 is disposed at the lower part, it is operated again to form the pattern 20 to be described later.

Meanwhile, the processing unit 300 is mounted on the height adjuster 400 and disposed on the seating jig 100,

The height adjuster 400 controls the gap between the seating jig 100 and the processing unit 300. The height adjuster 400 includes a guide frame 410 and a guide frame 410, And the processing unit 300 is mounted on the moving frame 420. The processing unit 300 is mounted on the moving frame 420,

On the other hand, the punching machine of the present invention may be configured as an index-type automation system as the case may be.

3, the seating unit 110 includes a plurality of valve plates 10 disposed along the circumference of the seating jig 100 so that the plurality of valve plates 10 can be disposed at the same time.

That is, as shown in FIG. 3, one of the seating portions 110 is composed of five fixing protrusions 111, and a total of seven valve plates 10 can be seated simultaneously in the seating jig 100 The seven seating portions 110 are circularly spaced apart by an angle of about 51 degrees.

A plurality of the processing units 300 are provided on the valve plate 10 disposed in the seating jig 100 according to the number.

Specifically, the processing units 300 are formed in a total of five, one on top of the seating unit 110.

Any one of the processing units 300 is set to form the pattern 20 only on the periphery of one of the suction port 11 or the discharge port 11 formed in one valve plate 10.

That is, the machining units 300 are formed on the upper portion of the seating part 110, and the positions of the tangential pins 310 are different from each other so that the patterns 20 are formed differently from each other.

Therefore, the parts to be processed by the five processing units 300 are set to be different from each other, and thereby, when the five valve plates 10 are simultaneously disposed on the seating part 110 of the seating jig 100, The pattern 20 can be formed in all five locations.

Specifically, the seating jig 100 is rotated at an interval of about 51 degrees, and one valve plate 10 is connected to the suction port 11 and the discharge port 11 The pattern 20 is formed at the periphery of the pattern 20,

Here, the other two of the seating portions 110 of the seating jig 100 are used to perform an operation of pulling out and reattaching the valve plate 10 by an operator.

Of course, the drawing and drawing operation of the valve plate 10 may be performed automatically by using a hydraulic system, not by manual operation, or by an automated system in the form of a conveyor.

A plurality of seating portions 110 are formed on the upper surface of the seating jig 100 so that a plurality of valve plates 10 can be mounted on the upper surface of the seating jig 100. When the seating jig 100 rotates, The pattern 20 is formed by the patterning process of the patterning device 20, thereby improving the productivity by automating the processing device more efficiently.

The tangential pins 310 are vertically long and are pressed to move the discharge port 11 of the valve plate 10 and the periphery of the suction port 11 to the lower end of the valve plate 10, A forming portion 311 is formed.

As shown in FIG. 4, the forming part 311 is formed in a conical shape whose tip diameter gradually decreases in a downward direction, and rounded at its tip end.

Further, as shown in Fig. 4, the side inclination angle of the forming portion 311 is 90 degrees.

Of course, the inclination angle a of the molding part 311 may be 60 degrees or 120 degrees depending on the case, and when the inclination angle a is 60 degrees, the diameter of the dot D is small and the depth is deep The diameter of the dot D becomes large and the depth becomes shallow.

The shaping unit 311 forms the concave circular dot D on the valve plate 10 by strongly lowering the tangential pins 310 downward by the processing unit 300, So as to form a variety of the patterns 20 of the plurality of dots D. [

Here, the dot D of the pattern 20 is filled with oil, and the surface roughness of the valve plate 10 is increased so that the surface tension of the oil during friction between the lead of the compressor cylinder and the valve plate 10 It functions to reduce noise and vibration.

In some cases, as shown in FIG. 5, the forming part 311 may be formed in a hexagonal shape.

Specifically, the forming portion 311 is formed in a hexagonal shape in cross section, and is formed to be gradually rounded in a downward direction while having its rounded end rounded.

When the valve plate 10 is pressed, the hexagonal-shaped concave dots D are formed.

When the shape of the dot D is hexagonal, the surplus space between the dot D and the dot D in the pattern 20 to be described later formed on the valve plate 10 is minimized, It is possible to form the dot (D) as much as possible in the area.

By forming the molding part 311 in the shape of a hexagonal horn, the maximum number of dots D are formed in the same area so that the oil filled in the dots D is uniformly applied over the entire area, The safety of the pattern 20 is improved, and the effect of minimizing the surface tension when rubbing against the lead is generated.

Of course, the molding part 311 may be modified in various ways such as a triangular pyramid, a quadrangular pyramid, or a pyramidal pyramid in addition to a cone or a hexagonal pyramid.

As shown in FIG. 6, the patterning technique and effect 10 fabricated by the punching machine according to the embodiment of the present invention are disk-shaped and include a plurality of the discharge ports 11 and the suction ports 11 are formed so as to be spaced apart from each other.

The pattern 20 is processed on the peripheral surfaces of the discharge port 11 and the suction port 11 by the processing unit 300. The pattern 20 includes a plurality of dots D along the outer periphery, (L) are spaced apart from each other in a direction away from the discharge port (11) or the suction port (11), wherein a distance between the lines (L) Becomes larger as the distance from the discharge port (11) and the suction port (11) increases.

Here, the dot D may be formed in a concave conical shape as shown in FIGS. 6 and 9, and may be formed in a concave hexagonal shape as shown in FIGS. 7 and 10, A triangular shape, a square shape, or the like.

6, the pattern 20 includes a first section 21, a second section 22, and a third section 23.

The first section 21 is formed along the outer periphery of the discharge port 11 or the suction port 11 and is a section in which the line L is not formed.

That is, the first section 21 is formed in a ring shape in which the surface having a constant width in a direction starting from the outer periphery of the discharge port 11 or the suction port 11 and gradually increasing away from the outer periphery is not worked.

The total width of the first section 21 is about 0.5 mm.

The second section 22 is a section where a plurality of lines L are formed outside the first section 21 and a plurality of dots D are formed along the outer circumference of the first section 21, So as to form a ring-shaped pattern 20.

Here, as shown in FIG. 6, the dots D are arranged so that their outer edges are in contact with each other, and may overlap each other as the case may be.

The entire width of the second section 22 is about 1.0 mm.

The second section 22 rubs against the lid of the compressor cylinder, and oil is applied to generate noise and vibration. However, since the surface of the second section 22 is rugged due to the shape of the pattern 20, Minimize noise and vibration.

The third section 23 has a plurality of lines L formed outside the second section 22 and the interval between the lines L is greater than the interval L between the second section 22 and the second section 22, Lt; / RTI >

Also, as shown in FIG. 6, the dots D of the third section 23 are disposed in contact with each other.

The third section 23 is used as a section filled with oil without rubbing against the leads, and has a total width of about 2.1 mm.

It is preferable that the interval between the lines L of the second section 22 is 0.1 to 0.2 mm and the interval between the lines L of the third section 23 is 0.2 to 0.5 mm.

In some cases, the pattern 20 may include only the second section 22 and the third section 23.

In this case, about 0 to 5 lines (L) are arranged in the second section 22 starting from the outer periphery of the discharge port 11 or the suction port 11 in the outward direction, (23) consists of about 15 lines (L).

Of course, the number of the lines L is freely adjustable.

8, the dot D of the pattern 20 is formed in a concave conical shape, and the dots D of the second section 22 are disposed in contact with each other, The dots of the light emitting element 23 can be arranged so as to overlap each other.

The surface tension of the second section 22 in which friction occurs directly is minimized and the noise and vibrations are reduced by increasing the distance between the line L and the discharge port 11 and the suction port 11. [ And an effect of increasing the oil content in the third section 23 is generated.

In addition, since the dots D are in contact with or overlap with each other, the pattern 20 minimizes the surface tension when rubbing against the leads, thereby further reducing noise and vibration.

On the other hand, as shown in Figs. 9 to 11, the dots D constituting the line L are formed by recessing only the processed portion, and the unprocessed surface is flat, It is possible to maintain constant height without worn out.

Here, the depth d1 of the dot D is 100 mu m or less and the angle of the inclined surface is 60 degrees. Of course, the angle of the inclined surface of the dot D may be 120 degrees.

Around the dot D, a first protruding portion D1 protruded convexly by reaction at the time of processing is formed.

The first protrusion D1 is protruded along the periphery of the dot D, and the height H1 is less than 50 m.

By forming the first protrusion D1 along the outer periphery of the dot D as described above, the existing surface is worn down to prevent the height from decreasing, and the surface tension is increased to reduce the occurrence of surface tension.

10, a second protrusion D2 is protruded between the dots D, and a height H2 of the second protrusion D2 is set to be smaller than a height H2 of the second protrusion D2, Is higher than the height (H1) of the first protrusion (D1).

11, a third protrusion D3 is formed between the dots D, and the third protrusion D3 is formed between the first protrusion D3 and the second protrusion D3, Is formed so as to protrude higher than the height (H1) of the protruding portion (D1).

The valve plate 10 formed with the pattern 20 having the above configuration generates less noise than the conventional valve plate and has a higher durability than that of the conventional valve plate.

12 is a table comparing the noise performance of the valve plate 10 according to the embodiment of the present invention and the conventional valve plate 60 having a pattern formed by the shot blast method. The noise evaluation is performed on the same compressor under the conditions of 800 rpm and 2000 rpm Respectively.

On the other hand, all other base conditions not shown here were applied under the same conditions.

In addition, noise was measured in the initial state of the product, that is, the state after continuous operation in the durability condition and the severe condition, that is, the after durability state, and the performance change rate was evaluated.

As a result, as shown in FIG. 12, the conventional valve plate 60 increased about 6.0 dB (A) from 61.8 dB (A) before durability to 67.8 dB (A) after durability at 800 rpm, The valve plate 10 according to the present invention increased only by 0.3 dB (A) from 60.3 dB (A) before the durability to 60.6 dB (A) after the durability.

12, the conventional valve plate 60 increased by about 8.8 dB (A) from 68.1 dB (A) before durability to 76.9 dB (A) after durability at 2000 rpm, The valve plate 10 increased only by 3.4 dB (A) from 67.5 dB (A) before the durability to 70.9 after the durability.

As described above, the patterning technique and effect (10) implemented by the punching machine according to the present invention have the effect of reducing the noise generation compared to the conventional valve plate (60) when the compressor is operated and the wear resistance is high, So that the effect of minimizing the increase is generated.

The punching processing method for forming the pattern 20 may include the steps of operating the processing unit 300 such that the tangential pins 310 are moved horizontally along the outer circumference of the discharge port 11 and the inlet 11, And vertically reciprocating at a constant speed in the vertical direction while moving.

Here, the moving speed of the machining unit 300 in the vertical direction is the same as the distance from the discharge port 11 and the suction port 11, and the horizontal moving speed of the tangential pin 310 is increased.

That is, the machining unit 300 reciprocates the tangential pins 310 in the vertical direction about 10 times in a second, as in a general steering apparatus, and in the second section 22, In the third section 23 to about 30 to 80 mm.

When the dots D are arranged so as to be in contact with each other as in the second section 22 of the pattern 20, the horizontal movement distance of the tangential pins 310 per punching is defined as the dot D, Is set to be equal to the diameter.

If the dots D are formed so as to overlap each other, the horizontal movement distance of the tangs 310 per punch is set to be shorter than the diameter of the dots D as occasion demands.

As described above, in the punching method according to the embodiment of the present invention, various patterns 20 can be formed at a speed without replacing equipment such as the tang pin 310, thereby improving the productivity and efficiency.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims something to do.

100: seating jig 110:
111: Fixing projection 200: Fixing jig
210: pressure plate 220: pressure cylinder
300: machining unit 310:
311: forming part 400: height adjuster
410: guide frame 420: moving frame
500: Base frame 10: Valve plate
11: inlet, outlet 20: pattern
21: first section 22: second section
23: third section D: dot
D1: first protrusion D2: second protrusion
D3: third protrusion L: line

Claims (8)

A valve plate having a pattern formed around a discharge port and a suction port using a punching device,
Wherein the pattern is a line in which dots of a predetermined shape are formed at regular intervals along the circumference of the discharge port and the suction port,
Wherein the plurality of lines are spaced apart from each other in a direction away from the discharge port and the suction port of the valve plate, and the distance between the lines is larger the distance from the discharge port and the suction port,
Wherein the dots have a depth of 10 to 200 占 퐉 and are formed to be tangent or overlapping with each other.
The method according to claim 1,
A first section formed along the outer periphery of the discharge port and the suction port and having no line formed therein;
A second section in which a plurality of lines are formed outside the first section;
A third section in which a plurality of lines are formed outside the second section, the interval between the lines being larger than the interval between the lines in the second section; The valve plate having a pattern machined by a punching machine.
The method according to claim 1,
Characterized in that the dots are formed in a conical shape.
The method according to claim 1,
Wherein the dots are formed in the shape of hexagonal horns.
The method according to claim 1,
Wherein a first first protrusion is formed on the outer side of the dot along the circumference of the dot by a pressing force at the time of dot processing.
The method according to claim 1,
And a second protrusion is protruded from the shortest adjacent portion between the dots when the dots are disposed in contact with each other.
The method according to claim 1,
Wherein a third protrusion is protruded between the overlapping dots when the dots are overlapped with each other.
A method of forming a pattern of a plurality of dots in a periphery of a discharge port and a suction port of a valve plate by using a punching machine for horizontally and vertically moving the other pins,
When the dots are arranged so as to be in contact with each other, the horizontally moving distance of the tangential pins per one punching is set to be equal to the diameter of the dots,
Wherein when the dots are arranged so as to overlap each other, the horizontal movement distance of the tangential pins per one punching is set to be shorter than the diameter of the dots.

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