JP2009178767A - Punch for porous processing, and method for producing metal plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a punch for porous processing which can efficiently form many fine through-holes, and can improve incorporation accuracy and processing accuracy, and to provide a method for producing a metal plate. <P>SOLUTION: The punch 49 is constituted so that many cutting edge pats 49c are arranged in a comb-like shape, at one punch body 49a, wherein many (three or more) through-holes 52 are formed at once by incorporating one punch 49 into a punch holder 48. Thus, working efficiency is improved, the generation of an incorporation error is suppressed to improve incorporation accuracy, and working accuracy is improved. Further, fine through-holes are press-worked with high efficiency by the punch for porous processing, and the obtained article is utilized as a filter. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a punch for punching and a method for manufacturing a metal plate, and more particularly to a punch for punching and a method for manufacturing a metal plate suitable for manufacturing a filter by forming a large number of fine through holes in a metal plate.

  A filter having a large number of fine holes in a metal plate, for example, a filter for filtering the liquid in the flow path of the liquid ejecting head that discharges as liquid droplets from the nozzle openings by causing pressure fluctuations in the liquid in the pressure chamber is thin. In this metal plate (for example, a stainless steel plate), a large number of fine-diameter through holes are formed. As a method for opening a through hole in a metal plate, there are a method by etching, a press working (plastic working) method using a mold, and the like.

  In the case of the above press working, in general, a metal plate is placed as a plate material to be processed on a die (female die) provided with one punch hole at a position corresponding to one through hole scheduled to be opened. In the mounted state, one through hole was repeatedly formed by pushing one punch (male) from the surface of the metal plate toward the punch hole of the die (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 05-169148

  In the case of forming a large number of fine through holes on the order of μm by such a conventional pressing method, a plurality of punches having a small diameter for processing a through hole are attached to a punch holder, and a single pressing step is performed. However, there is a problem in that productivity is poor because there are many operations for assembling the punch into the punch holder. In addition, since a plurality of punches are incorporated in the punch holder, there is a problem in that the incorporation errors of the punches are accumulated one by one and the processing accuracy is lowered. Furthermore, it is difficult to secure a clearance between the die and the punch assembly accuracy, and the punch may come into contact with the die to cause damage to the punch.

  The present invention has been made in view of such circumstances, and an object of the present invention is to perform multi-hole processing that can efficiently form a large number of fine through-holes and can improve assembling accuracy and processing accuracy. The object is to provide a method for manufacturing a punch and a metal plate.

  In order to achieve the above object, a punch for porous processing according to the present invention is a punch for punching a through hole in a plate material to be processed, wherein the punch is formed in one punch body with a plurality of cutting blade portions in parallel. It is characterized by being arranged.

According to the above configuration, a plurality of (three or more) through holes are formed once by incorporating a single punch into the punch holder by forming a punch having a plurality of cutting blade portions arranged in parallel in one punch body. Can be formed. Thereby, while being able to process efficiently, generation | occurrence | production of an installation error can be suppressed and an assembly precision can be improved, and a processing precision can be improved.
Moreover, by arranging the cutting blade portions in the comb body in the punch body, the through-holes can be processed by the cutting blade portions for each comb-shaped array, and processing can be performed more efficiently.

  In the punch for porous processing according to the present invention, the cutting edge portion has a polygonal cross-sectional shape.

  According to the above configuration, since the cross-sectional shape of the cutting blade portion is a polygon, the cutting blade portion can be polished for each plane of the polygon, and in particular, parallel to the arrangement direction of the punch bodies such as a quadrangle. If a plane is provided, parallel planes of a large number of cutting blade portions can be polished at a time. By making this cutting edge part a circular diameter or a circle inscribed with a polygon having a diameter in the range of several tens of μm to several tens of μm, fine through holes can be efficiently pressed and used as a filter. can do.

  The metal plate manufacturing method of the present invention is a method for manufacturing a metal plate in which a plurality of through holes are formed on a processed plate material using a punch, and the processed plate material is mounted on a base made of an elastic material. In this state, a plurality of through holes are formed at a time by punching the processed plate material with a punch in which a plurality of cutting blade portions are arranged in parallel on one punch body.

  According to the above-described configuration, a large number of through holes are formed at a time by punching with a punch in which a large number of cutting blades are disposed in the punch body in a state where the work plate is placed on a base made of an elastic material. It can be pressed without using a die. For this reason, there is no possibility of contact with the die, and fine through holes can be efficiently formed while ensuring the durability of the punch. In addition, since a base (elastic mat) made of an elastic material is used instead of the conventional female mold, the processing apparatus including the mold can be simplified, and the processing cost can be reduced.

Further, the metal plate manufacturing method of the present invention is characterized in that a plate-like filter for filtering a fluid is manufactured by cutting the processed plate material in which the through hole is formed into a predetermined size and shape. .
According to the said structure, the plate-shaped filter which opened many fine through-holes to a to-be-processed board | plate material can be easily pressed.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. In the embodiments described below, various limitations are made as preferred specific examples of the present invention. However, the scope of the present invention is not limited to the following description unless otherwise specified. However, the present invention is not limited to these embodiments. Further, in the following description, as a processed plate material in the present invention, it is used for an ink jet recording head (a kind of liquid ejecting head; hereinafter simply referred to as a recording head) mounted on an ink jet recording apparatus (hereinafter simply referred to as a printer). An example of a filter is shown.

First, the configuration of the recording head will be described.
FIG. 1 is a cross-sectional view of a main part for explaining the configuration of the recording head 1 in the present embodiment. The illustrated recording head 1 includes a filter assembly 5 including an ink introduction needle 2, a filter 3, an introduction needle unit 4, and the like, and a head unit 10 including a vibrator unit 7, a head case 8, a flow path unit 9, and the like. And is schematically configured. A series of ink flow paths (a type of liquid flow path) from the liquid supply source to the nozzle openings are formed inside the recording head 1.

  The ink introduction needle 2 (liquid introduction needle) is a hollow needle-like member molded from a synthetic resin such as an epoxy resin, for example, and its internal space is a liquid storage member such as an ink cartridge or a sub tank (self-sealing valve). The needle channel 12 into which ink (a kind of liquid or fluid) in the (liquid storage source) is introduced. An introduction hole 13 communicating with the needle flow path 12 is formed at the tip of the ink introduction needle 2, and when the ink introduction needle 2 is inserted into the liquid storage member, the liquid is passed through the introduction hole 13. The ink in the storage member is introduced into the needle channel 12. The base portion of the ink introduction needle 2 is a diameter-expanded portion 14 whose diameter is increased from the upstream side (tip side) toward the downstream side (introduction needle unit 4 side). The enlarged diameter portion 14 has a function of temporarily capturing bubbles (a kind of fluid) generated in the ink flow path. In the vicinity of the downstream opening of the enlarged diameter portion 14, that is, in the vicinity of the downstream opening of the ink introduction needle 2, there are many fine through holes for filtering the ink introduced into the needle flow path 12. The formed filter 3 is disposed. Details of the filter 3 will be described later.

  The introduction needle unit 4 is molded of a synthetic resin such as an epoxy resin like the ink introduction needle 2, and an ink supply path 17 corresponding to each ink introduction needle 2 is formed therein. The ink introduction needle 2 is attached to the introduction needle unit 4 with the filter 3 fixed to the peripheral edge of the inlet opening 17 ′ of the ink supply path 17. That is, the ink supply path 17 communicates with the needle flow path 12 in a liquid-tight state. Further, the downstream end of the ink supply path 17 communicates with a case flow path 19 formed inside the head case 8 via a flow path joint member 18 (packing) in a liquid-tight state. Thus, the ink introduced from the introduction hole 13 of the ink introduction needle 2 is filtered by the filter 3 and then supplied to the head unit 10 side through the ink supply path 17.

  The head case 8 is a casing for housing the vibrator unit 7. For this reason, the head case 8 is formed with an accommodation space 22 in which the transducer unit 7 can be accommodated. The vibrator unit 7 is inserted into the housing space 22 and fixed to the inner wall of the housing space 22 by bonding or the like. One surface of the head case 8 is joined to the introduction needle unit 4, and the case flow path 19 communicates with the ink supply path 17 of the introduction needle unit 4 in a liquid-tight state. A flow path unit 9 is fixed to the other surface of the head case 8 with an adhesive or the like. This flow path unit 9 is manufactured by joining and integrating with an adhesive etc. in the state which laminated | stacked the diaphragm 23, the flow path formation board | substrate 24, and the nozzle plate 25. As shown in FIG.

  The vibrator unit 7 includes a piezoelectric vibrator 30 as a pressure generation source, a fixing plate 31 to which the piezoelectric vibrator 30 is joined, a circuit board 32 for supplying a drive signal to the piezoelectric vibrator 30, The circuit board 32 and the piezoelectric vibrator 30 are configured to include a flexible cable 33 and the like. The piezoelectric vibrator 30 according to this embodiment includes a plurality of piezoelectric vibrators 30 arranged in a comb shape. Each piezoelectric vibrator 30 has a fixed end joined to the fixed plate 31 and a free end protruding outward from the tip surface of the fixed plate 31. That is, each piezoelectric vibrator 30 is mounted on the fixed plate 31 in a so-called cantilever state. The fixing plate 31 that supports each piezoelectric vibrator 30 is made of stainless steel having a thickness of about 1 mm, for example. In addition to the piezoelectric vibrator, an electrostatic actuator, a magnetostrictive element, a heating element, or the like can be used as the pressure generation source.

  The nozzle plate 25 disposed at the bottom of the flow path unit 9 is a thin metal plate material in which a plurality of nozzle openings 35 are opened in a row at a pitch (for example, 180 dpi) corresponding to the dot formation density. The nozzle plate 25 of the present embodiment is made of a stainless steel plate material, and a plurality of rows of nozzle openings 35 (nozzle rows) are provided in the scanning direction of the recording head 1. One nozzle row is composed of, for example, 180 nozzle openings 35.

  The flow path forming substrate 24 disposed between the nozzle plate 25 and the vibration plate 23 includes a flow path base that serves as an ink flow path, specifically, a common ink chamber 37 that is a kind of a common liquid chamber, and an ink supply port. 38 and a plate-like member in which empty portions to be the pressure chambers 39 are partitioned. In this embodiment, the flow path forming substrate 24 is produced by subjecting a silicon wafer, which is a crystalline base material, to anisotropic etching.

  The vibration plate 23 disposed between the flow path forming substrate 24 and the head case 8 is a composite plate material having a double structure in which an elastic film is laminated on a metal support plate such as stainless steel. In the portion corresponding to the pressure chamber 39 of the vibration plate 23, an island portion 41 for joining the front end surface of the free end portion of the piezoelectric vibrator 30 is formed by removing the support plate in an annular shape by etching or the like. This part functions as a diaphragm part. That is, the diaphragm 23 is configured such that the elastic film around the island portion 41 is elastically deformed in accordance with the operation of the piezoelectric vibrator 30. The diaphragm 23 also functions as a compliance unit 42 by sealing the opening surface of the common ink chamber 37 of the flow path forming substrate 24. As for the portion corresponding to the compliance portion 42, the support plate is removed by etching or the like in the same manner as the diaphragm portion to make only the elastic film.

  In the recording head 1, when a drive signal is supplied from the circuit board 32 to the piezoelectric vibrator 30 through the flexible cable 33, the piezoelectric vibrator 30 expands and contracts in the longitudinal direction of the element. It moves in the direction close to or away from the pressure chamber 39. As a result, the volume of the pressure chamber 39 changes, and pressure fluctuation occurs in the ink in the pressure chamber 39. Ink drops are ejected (ejected) from the nozzle openings 35 due to this pressure fluctuation.

Here, the filter 3 having a large number of through holes through which the fluid passes is described. FIG. 2 is a front view of the filter 3 and a partially enlarged view thereof.
The filter 3 is configured by opening a large number of fine through holes 52 of about several tens of micrometers to several tens of micrometers through which ink and bubbles can pass through a circular plate made of metal (for example, a stainless steel plate). The fine through-hole 52 is not limited to a circular shape but may be a polygonal shape. In this case, the diameter of the circle or the diameter of the circle inscribed by the polygon can pass the above-described ink and bubbles. About 10 to several tens of μm. The plate thickness of the filter 3 (base plate 3 ′ to be the filter 3) and the inner diameter of the through hole 52 of the present embodiment are both 15 μm. The plate thickness of the base plate 3 ′ is preferably a value within the same range as the dimension range of the inner diameter of the through hole 52. When such a fine through hole 52 is opened in a metal plate by a conventional press working method, a male die (punch) in which a plurality of punches are set in a punch holder corresponding to one through hole is used. For this reason, there is a problem in that the number of assembling operations increases, the machining efficiency is low, and assembling errors are accumulated to reduce the machining accuracy.

  For this reason, in this embodiment, the said malfunction is eliminated by producing the said filter 3 by pressing using the punch 49 for porous processing which concerns on this invention.

  FIG. 3 is a cross-sectional view of an essential part for explaining the configuration of a press mechanism 44 for opening a through hole 52 in a base plate 3 ′ (corresponding to a processed plate material in the present invention) to be a filter 3, and FIG. It is a schematic perspective view of the processing punch 49. The illustrated press mechanism 44 includes a pedestal (surface plate) 45, an elastic mat 46 (corresponding to the base in the present invention), a stripper plate 47, a punch holder 48, a punch 49 for perforating, and the like. . The stripper plate 47 is relatively close to and separated from the punch holder 48 while being urged downward by a stripper bolt (not shown) around which an urging member such as a coil spring is wound. Installed as possible.

  The punch 49 for porous processing includes a punch body 49a attached to the punch holder 48, is formed in a rectangular parallelepiped shape, and a plurality of punch body portions 49b are arranged along the longitudinal direction thereof, and the tip end portion of each punch body portion 49b. A cutting edge portion 49c is formed on the surface. In this embodiment, as shown in FIG. 4, the punch body 49 b and the cutting edge 49 c are formed in a quadrangular cross-sectional shape, and nine are arranged in a row in a comb-teeth shape and integrated with the punch body 49 a. Is formed. Accordingly, by attaching the punch body 49a of one punch for punch 49 to the punch holder 48, a large number (three or more) of cutting blade portions 49c can be set, the punch can be made compact, Assembling can be performed efficiently in a short time. Further, the cutting blade portion 49c itself can be easily manufactured by arranging the punch body portion 49b and the cutting blade portion 49c of the perforated punch 49 in a comb-like shape in a cross-sectional shape in a square shape. Further, since both sides of the cutting blade portions 49a in the arrangement direction are positioned on one plane, each plane can be polished at once when the cutting blade portion 49c is polished, and it is easy to maintain sharpness. Become. In addition, a cutting blade part can also be arrange | positioned not only in the case of arrange | positioning in 1 row but in multiple rows. Further, if there are a plurality of cutting blade portions, the number of the cutting blade portions may be determined as appropriate, and it may be configured so that dozens of them can be perforated efficiently.

  The stripper plate 47 of the press mechanism 44 is provided with a guide hole 50 having a circular cross section set to an inner diameter (diameter) slightly larger than the outer diameter (diameter of a square circumscribed circle) of the body portion 49b of the punch 49 for porous processing. Has been. One punch 49 is attached to the punch holder 48 with the body portion 49b of the punch 49 inserted into the guide hole 50 of the stripper plate 47 and the cutting edge portion 49c at the tip of the punch 49 facing downward. . The punch holder 48 is mounted on a ram (not shown) of a press machine and is configured to be movable up and down with respect to the base 45.

  On the upper surface of the pedestal 45, an elastic mat 46 for supporting a base plate 3 ′ (corresponding to a processed plate material in the present invention) to be the filter 3 is disposed. The elastic mat 46 is a plate made of an elastic material such as polyethylene terephthalate (PET) or an elastomer, and is set to a thickness of about 20 times the thickness of the base plate 3 ′. And when forming the through-hole 52 in base-material plate 3 ', it processes in the state which mounted base-material plate 3' on the elastic mat 46. FIG. That is, the metal plate manufacturing method of the present invention employs so-called dieless processing.

  In the through hole forming step, the base plate 3 ′ is placed on the elastic mat 46, the back surface (first surface) of the base plate 3 ′ is brought into contact with the elastic mat 46, and these are set on the pedestal 45. . Although not shown, a correction frame is attached to the outer peripheral edge of the base plate 3 ′, and the entire surface of the base plate 3 ′ in contact with the elastic mat 46 without warping. If it does in this way, tension will be given to the surface direction of base material plate 3 'with a correction frame. In this state, the punch holder 48 is lowered toward the elastic mat 46 side. Then, first, the lower surface of the stripper plate 47 comes into contact with the surface (second surface) of the base plate 3 ′. Thereafter, when the punch holder 48 is further pushed down while resisting the biasing force of the coil spring, each cutting edge portion 49c of the punch 49 for porous machining is guided to the guide hole 50 of the stripper plate 47, while the base plate 3 '. It is pushed from the front side to the back side. At this time, the punching punch 49 enters the inside while flowing a part of the material of the base plate 3 ′, and a part of the base plate 3 ′ receiving the pressing force from the punching punch 49. However, it is pushed out to the back side of the base plate 3 ′ while resisting the elastic force of the elastic mat 46 to form a bulging portion.

Then, when the perforating punch 49 is further pushed into the elastic mat 46 as shown in FIG. 5, the number of through holes 52 corresponding to the number of the cutting blade portions 49c are punched into the base plate 3 'at a time. Can do. In other words, with the perforated punch 49 shown in FIG. 4, nine through holes 52 can be punched at a time.
At the time of this punching, the portion that becomes the through hole 52 in the base plate 3 ′ and the peripheral edge thereof are pushed into the depth side in the thickness direction of the elastic mat 46 and deformed, whereby the peripheral edge of the through hole 52 is opened. 53 is formed in a state of bending from the front surface of the base plate 3 ′ to the back surface side (punching direction) and falling in a funnel shape toward the opening edge. A portion where the opening peripheral edge portion 53 gently falls becomes a depressed portion. The back side of the depressed portion is formed in a state of protruding in a gentle hill shape (crater shape). That is, there is no clearance between the conventional punch and the die between the elastic mat 46 and the cutting edge portion 49c of the porous processing punch 49, and the porous processing punch 49 resists the elasticity of the elastic mat 46. As a result, the peripheral edge 53 of the opening is deformed by being pushed into the elastic mat 46, so that a portion bent sharply with respect to the base plate does not occur unlike the conventional burr.

  Subsequently, after punching out the base plate 3 ′ with the porous processing punch 49, the porous processing punch 49 is pushed further into the thickness direction of the elastic mat 46 while resisting the elastic force of the elastic mat 46. At this time, the distance from the surface of the base plate to the bottom dead center, that is, the pushing amount of the porous processing punch 49 into the elastic mat is preferably at least twice the thickness of the base plate 3 ′. As a result, the punched portion 54 when punching with the punch 49 for porous processing is completely detached from the base plate 3 ′ and pushed into the elastic mat 46.

  Thereafter, the punch holder 48 is raised. Then, the punching punch 49 is pulled out from the base plate 3 ′ while the stripper plate 47 biased downward is in pressure contact with the base plate 3 ′. Thereafter, as the punch holder 48 moves upward toward the top dead center, the stripper plate 47 moves away from the base plate 3 ′. Then, the dregs 54 is retained and retained in a recess formed by pressing on the surface of the elastic mat 46. As a result, it is not necessary to separately provide a process for collecting the extracted dregs 54, which is convenient.

  In this way, as shown in FIG. 5, a large number of through holes 52 are formed in a row at once with the porous processing punch 49 on the base plate 3 ′ while sequentially feeding the base plate 3 ′ and the elastic mat 46 in a polymerized state. A plurality of rows are sequentially opened at predetermined intervals, and finally, a finished product punched into a predetermined shape (for example, a circle) and size becomes the filter 3 used in the recording head 1. In the present embodiment, the distance (inter-hole pitch) between the through holes 52 in the filter 3 is set to be twice or more the inner diameter of the through holes 52. Thereby, as shown in the figure, a flat region F having no depression is sufficiently secured between the adjacent through holes 52. For this reason, in the adjacent through holes 52, the flow of the material of the base plate 3 ′ during the processing of the through holes 52 to be formed later affects the previously formed through holes 52 (for example, The deformation or the like of the previously formed through hole 52) can be minimized.

  According to the above method for producing a metal plate (having a through hole) by the punch 49 for porous processing, the front surface (first surface) is in a state where the back surface (first surface) of the base plate 3 ′ is in contact with the elastic mat 46. 2), a large number of through holes 52 are formed by punching with a perforating punch 49, so that it is not necessary to use a female die (die) in conventional press working. For this reason, many fine through holes 52 can be formed at one time while ensuring the durability of the punch 49 for porous processing. Further, since the elastic mat 46 is used in place of the conventional female mold, a processing device such as a mold can be simplified, thereby reducing the cost.

  In addition, by deforming the opening peripheral edge 53 of the through hole 52 provided in the base plate 3 ′ and forming a depressed portion that bends in a punching direction and falls in a funnel shape toward the opening edge, The back side has a gently crater-like (hill-like) shape, and separation like a conventional burr (a portion protruding in a suddenly bent state with respect to the base plate) hardly occurs. As a result, defects due to burrs can be reduced, and in the case of the recording head 1 including the filter 3, burrs are mixed into the ink in the ink flow path to block the flow path, or together with the ink from the nozzle openings 35. Problems such as burrs being discharged and adhering to recording paper or the like can be prevented.

  In the above description, the processing of the filter 3 used in the recording head 1 which is a kind of liquid ejecting head in the method for manufacturing a metal plate according to the present invention has been described as an example. However, in the porous processing used for other applications. Can be applied, and is suitable for forming a fine through hole on the order of μm in a thin metal plate or the like.

FIG. 3 is a cross-sectional view of a main part for explaining the configuration of a recording head. FIG. 6 is a front view and an enlarged cross-sectional view of a filter of a recording head. It is principal part sectional drawing explaining the structure of a press mechanism. It is a schematic perspective view of the punch for porous processing. It is sectional drawing explaining the process of forming a several through-hole in a base material plate.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Recording head, 2 ... Ink introduction needle, 3 ... Filter, 3 '... Base plate, 44 ... Press mechanism, 45 ... Base, 46 ... Elastic mat, 47 ... Stripper plate, 48 ... Punch holder, 49 ... Porous processing Punch 49a ... punch body 49b ... barrel part 49c ... cutting edge part 50 ... guide hole 52 ... through hole 53 ... peripheral edge part 54 ... punching residue

Claims (6)

It is a punch for perforating processing that presses a through hole against a workpiece plate material,
A punch for porous processing, wherein a punch is configured by arranging a plurality of cutting blade portions in parallel on one punch body.   The punch for porous processing according to claim 1, wherein the cutting blade portions are arranged in a comb-teeth shape on the punch body.   The punch for porous processing according to claim 2, wherein the cutting edge portion has a polygonal cross-sectional shape.   4. The punch for porous processing according to claim 3, wherein the cutting edge portion has a circular diameter or a diameter of a circle inscribed by a polygon within a range of several tens of μm to several tens of μm. 5. A method of manufacturing a metal plate that uses a punch to form a large number of through-holes on a workpiece plate,
In a state where the processed plate material is placed on a base made of an elastic material, the through hole is formed by punching the processed plate material with a punch in which a plurality of cutting blade portions are arranged in parallel on one punch body. A method for producing a metal plate.   6. The method of manufacturing a metal plate according to claim 5, wherein a plate-like filter for filtering fluid is manufactured by cutting the processed plate material in which the through-hole is formed into a predetermined size and shape.

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