CN112238176B - Micro-hole machining method - Google Patents
Micro-hole machining method Download PDFInfo
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- CN112238176B CN112238176B CN201910649622.XA CN201910649622A CN112238176B CN 112238176 B CN112238176 B CN 112238176B CN 201910649622 A CN201910649622 A CN 201910649622A CN 112238176 B CN112238176 B CN 112238176B
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- punch
- thin plate
- convex hull
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- hole
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/02—Stamping using rigid devices or tools
- B21D22/04—Stamping using rigid devices or tools for dimpling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
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- Mechanical Engineering (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
Abstract
The invention relates to the technical field of micro-hole processing, and provides a micro-hole processing method which comprises the steps of material preparation, convex hull punching and grinding hole forming, wherein in the material preparation step, a convex die and a concave die are prepared, a punch is arranged on the convex die, the diameter of the punch is gradually reduced along the radial direction of the convex die, the maximum diameter of the punch is less than 0.2mm, the height of the punch is greater than the thickness of a thin plate, and the difference between the height of the punch and the thickness of the thin plate is 0.03-0.05 mm; in the step of blanking the convex hull, firstly, a thin plate is placed on a female die, and then the male die is used for blanking the thin plate so that a punch is used for blanking the thin plate to form the convex hull; in the grinding and hole-forming step, the convex hulls are ground and removed to expose and form micro holes on the thin plate. The diameter of the punch is gradually decreased in the micro-hole processing method, so that the punch is suitable for processing micro-holes with smaller sizes and has certain strength, and the punch does not need to integrally penetrate through a thin plate, so that the breaking risk of the punch in the blanking process and the resetting process is reduced.
Description
Technical Field
The invention relates to the technical field of micro-hole machining, in particular to a micro-hole machining method.
Background
In the related art, a hole having a diameter of 0.2mm or less is referred to as a fine hole, and a plate having a thickness of 0.5mm or less is referred to as a thin plate. Conventionally, the micro holes are formed on the thin plate by punching with a punch. However, as the diameter of the preformed micro-holes is smaller, the diameter of the punch used is also smaller, which results in a greater risk of breakage during punching and punch resetting, and a higher cost for processing and maintaining the punch.
Disclosure of Invention
The invention aims to provide a micro-hole processing method, and aims to solve the problem that a punch is easy to break when the existing micro-hole processing method adopts the punch to punch and form micro holes.
In order to solve the technical problem, the technical scheme of the invention is as follows: a micro-hole machining method for machining and forming micro-holes in a thin plate, comprising the steps of:
preparing a material, namely preparing a male die and a female die, wherein the male die is provided with at least one punch, the diameter of the punch is gradually reduced from one side of the punch connected with the male die along the radial direction of the punch, the maximum diameter of the punch is less than 0.2mm, the height of the punch is greater than the thickness of the thin plate, the difference between the height of the punch and the thickness of the thin plate is 0.03-0.05 mm, the male die and the female die are arranged in an up-and-down opposite alignment manner, and the side surface of the female die opposite to the male die is provided with a groove corresponding to the punch;
Blanking a convex hull, namely placing the thin plate on the side surface of the female die opposite to the male die, and then blanking the thin plate by the male die so that the punch punches the thin plate to form the convex hull which is arranged to protrude towards one side of the groove;
and grinding and forming a hole, and grinding and removing the convex hull on the thin plate so as to expose and form a micro hole penetrating through the thin plate.
Further, the convex hull comprises a convex hull flattening section connected with the thin plate and a convex hull grinding section connected with one side, away from the thin plate, of the convex hull flattening section, and the height of the convex hull flattening section is smaller than or equal to the difference between the height of the punch and the thickness of the thin plate;
in the step of grinding and forming the hole, the convex hull grinding section is firstly ground and removed to expose and form a base hole penetrating through the thin plate and the convex hull flattening section, and then the convex hull flattening section is flattened and removed to form the micro hole penetrating through the thin plate based on the base hole.
Further, in the blanking convex closure step, earlier by the terrace die is right the sheet metal carries out initial blanking processing, so that the drift is in on the sheet metal the blanking forms court the protruding first convex closure that sets up of recess one side, moves again the sheet metal is right by the terrace die the sheet metal carries out blanking processing once more, so that the drift is in first convex closure side blanking forms court the protruding second convex closure that sets up of recess one side, first convex closure with the second convex closure is constituteed jointly the convex closure.
Further, in the material preparation step, a thin substrate is prepared, the thickness of the thin substrate is equal to that of the thin substrate, and the thin substrate is provided with at least one working plate area and a non-working plate area outside each working plate area;
in the step of blanking the convex hull, the working plate area is moved and placed on the side face of the female die opposite to the male die, and then the male die performs blanking processing on the working plate area, so that the punch punches on the working plate area to form the convex hull protruding towards one side of the groove;
after the step of blanking the convex hull and before the step of grinding the hole, the micro-hole machining method further includes:
and cutting the thin substrate along the periphery of the working plate area to peel off and form the thin plate.
Further, in the material preparation step, two sections of pre-broken lines are pre-divided at two opposite edges of the working plate area;
in the dividing into plates step, the thin substrate is divided along the pre-breaking line to be peeled off and formed into the thin plate.
Further, in the material preparation step, four area identification holes are further formed in the periphery of the working plate area, and each area identification hole is located in the non-working plate area and is used for identifying and dividing one working plate area.
Further, the radial dimension of the groove is set to be greater than the radial dimension of the convex hull, and the depth of the groove is set to be greater than the height of the convex hull.
Further, the radial dimension of the groove gradually decreases from the notch to the groove bottom.
Further, the punch is conical or circular truncated cone-shaped.
Further, the pore diameter of the fine pores is not less than 0.05 mm.
The invention has the beneficial effects that:
the method for processing the micro holes comprises the steps of placing a thin plate between a male die and a female die, blanking the thin plate through a punch on the male die to form convex hulls protruding towards the side of a groove on the thin plate, and then grinding and removing the convex hulls to expose and form the micro holes. The diameter of the punch is gradually reduced along the radial direction of the punch, so that the punch is suitable for processing and forming the micro holes with smaller size, has certain strength to reduce the breaking risk of the punch in the blanking process and the resetting process, and does not need to integrally penetrate through a thin plate, thereby further reducing the breaking risk of the punch in the blanking process and the resetting process, and further reducing the processing cost to a certain extent.
Drawings
FIG. 1 is a flowchart illustrating a method for manufacturing a micro hole according to an exemplary embodiment of the present invention;
fig. 2 is a schematic cross-sectional view illustrating a step of blanking a convex hull according to an embodiment of the present invention;
FIG. 3 is an enlarged partial view of area A provided in FIG. 2;
FIG. 4 is a schematic cross-sectional view of a sheet with a first convex hull punched out of the sheet according to an embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view of a sheet with a convex hull punched out of the sheet according to an embodiment of the present invention;
FIG. 6 is a schematic cross-sectional view of a sheet after grinding to remove convex hulls from the sheet in accordance with an embodiment of the invention;
FIG. 7 is a schematic cross-sectional view of a sheet after a step of forming holes by grinding in accordance with an embodiment of the present invention;
fig. 8 is a top view of a thin substrate provided by an embodiment of the present invention.
Reference numerals:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | |
110 | Convex |
| 111 | Convex hull flattening section | 112 | Convex |
| 113 | |
114 | |
| 101 | Micro-hole | 102 | |
| 200 | Male die | 210 | |
| 300 | Concave die | 301 | Groove |
| 400 | |
401 | Pre-breakingThread |
| 402 | Area identification hole |
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the embodiments of the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.
The following describes a specific implementation of the present invention in more detail with reference to specific embodiments:
conventionally, in related industries, through-holes are mostly formed by punching directly at corresponding positions of a thin plate through a punch, however, the conventional micro-hole processing method has at least the following problems:
1) the diameter of the punch is matched with the diameter of the preset micro-hole, so that the smaller the diameter of the preset micro-hole is, the smaller the diameter of the punch is, namely the thinner the punch is, the weaker the strength and rigidity of the punch is, the punch is easy to break in the punching and hole forming process or the returning and resetting process, and the higher cost is consumed in the processing and maintenance of the punch;
2) the scraps produced in the process of punching the holes by using the punch are splashed outwards, so that the scraps are easily splashed into the micro holes, and particularly when the hole pitch of the micro holes is dense, the micro holes are easily blocked;
3) the punch is adopted to punch and form holes, so that large impact force is easily applied to the thin plate, and the thin plate is easy to deform;
4) the thinner the thickness of the thin plate is, the weaker the strength and rigidity of the thin plate are, and the thin plate is easy to break along with the reduction of the pitch of the micro holes.
Referring to fig. 1-3, to solve the problem that the punch 210 is easily broken, an embodiment of the present invention provides a micro-hole processing method for processing and forming micro-holes 101 in a thin plate 100, where the micro-hole processing method includes material preparation, punching of a convex hull 110, and grinding to form a hole.
In the material preparation step, a punch 200 and a die 300 are prepared, the punch 200 is provided with at least one punch 210, the diameter of the punch 210 gradually decreases from the side connected with the punch 200 along the radial direction, the maximum diameter of the punch 210 is smaller than 0.2mm, the height of the punch 210 is larger than the thickness of the thin plate 100, the difference between the height of the punch 210 and the thickness of the thin plate 100 is 0.03-0.05 mm, the punch 200 and the die 300 are arranged in a vertically opposite manner, and the die 300 is provided with a groove 301 corresponding to the punch 210 on the side opposite to the punch 200. It should be noted that the number of the punches 210 should be set according to the number of the preset micro holes 101 on the sheet 100, the positions of the punches 210 should be correspondingly set according to the positions of the micro holes 101, correspondingly, the number and the positions of the grooves 301 should be set corresponding to the number and the positions of the punches 210, and in an actual application scenario, a set of the male mold 200 and the female mold 300 should be placed and used in an up-and-down aligned manner.
It should be noted that in the present embodiment, the diameter of the punch 210 changes in a gradually decreasing trend from the side thereof connected with the punch 200 to the side thereof away from the punch 200, and the punch 210 thus arranged can not only condense enough pressure at the end with the smallest diameter to enable the punch to easily perform the punching operation, but also gradually increase the strength and rigidity thereof by utilizing the gradually changing diameter to avoid the fracture phenomenon during the punching process and the retraction resetting process. In addition, the height of the punch 210 is greater than the thickness of the thin plate 100, and the difference between the height of the punch 210 and the thickness of the thin plate 100 is 0.03-0.05 mm, so that when the end with the largest diameter of the punch 210 is flush with one side surface of the thin plate 100, the top end with the smallest diameter of the punch 210 just penetrates through the other side surface of the thin plate 100 by 0.03-0.05 mm, and therefore the fine holes 101 formed in the subsequent grinding and hole forming step are the fine holes 101 penetrating through the thin plate 100, the strength of the top end with the smallest diameter is guaranteed, and damage to the punch 210 is avoided.
It should be noted that, when the end of the punch 210 with the largest diameter is flush with one side of the thin plate 100, the diameter of the cross section of the punch 210 cut from the other side of the thin plate 100 is adapted to the diameter of the preset micro hole 101, so as to avoid the situation that the micro hole 101 needs to be finely tuned after the grinding and hole forming step, improve the accuracy of the finally formed micro hole 101, and improve the effectiveness of the micro hole processing method.
Referring to fig. 5, in the step of punching the convex hulls 110, the sheet 100 is placed on the side surface of the die 300 opposite to the punch 200, and then the punch 200 performs a punching process on the sheet 100, so that the punch 210 punches the sheet 100 to form the convex hulls 110 protruding toward the groove 301. It should be noted that, in this step, the cavity die 300 will provide enough supporting force to the sheet 100 to facilitate the punch 200 to perform its operation of punching the convex hull 110, and reduce the deformation amount of the sheet 100 generated when the sheet is subjected to the impact force, and meanwhile, the arrangement of the groove 301 can also avoid any obstruction of the cavity die 300 to the formation of the convex hull 110 in this step, and avoid negative interference to the punching operation of the punch 210, so as to further avoid the occurrence of the fracture phenomenon of the punch 210 during the punching process. It should be further noted that, in this step, the end with the smallest diameter of the punch 210 (hereinafter referred to as the top end of the punch 210) penetrates from one side surface of the thin plate 100 to the other side surface of the thin plate 100 first and penetrates out 0.03-0.05 mm until the end with the largest diameter of the punch 210 (hereinafter referred to as the bottom end of the punch 210) is flush with one side surface of the thin plate 100, so that the convex hull 110 protruding towards one side of the groove 301 is formed on the thin plate 100, and then the punch 210 is retracted and reset, so that holes with gradually changed diameters are formed on the thin plate 100 and the convex hull 110. In this step, the punch 210 does not need to penetrate the thin plate 100 as a whole, and based on this design, not only can the strength of the punch 210 be prevented from being greatly affected, but also the punch 210 can be prevented from breaking off during the process of blanking the convex hull 110 to a great extent, and the punch 210 can be facilitated to realize the retraction reset, so that the breaking off during the retraction reset process can be further prevented.
Referring to fig. 7, in the step of forming a hole by grinding, the convex hull 110 of the thin plate 100 is ground and removed to expose and form the micro hole 101 penetrating the thin plate 100. In the design where the difference between the height of the punch 210 and the thickness of the thin plate 100 is 0.03 to 0.05mm, the fine holes 101 formed through the thin plate 100 are exposed and formed in the thin plate 100 after the convex hulls 110 on the thin plate 100 are polished and removed, and the diameter of the fine holes 101 is gradually changed, that is, the diameter of the punch 210 corresponds to the diameter of the thin plate 100.
The method for processing the micro holes according to the embodiment of the present invention places the sheet 100 between the punch 200 and the die 300, and performs blanking on the sheet 100 by the punch 210 on the punch 200 to form the convex hulls 110 protruding toward the groove 301 side on the sheet 100, and then the micro holes 101 may be exposed and formed by grinding and removing the convex hulls 110. In the method for processing the micro holes provided by the embodiment of the invention, the diameter of the punch 210 is gradually reduced along the radial direction, so that the punch 210 is not only suitable for processing and forming the micro holes 101 with smaller size, but also has certain strength so as to reduce the breaking risk of the punch 210 in the blanking process and the resetting process, and the punch 210 does not need to integrally penetrate through the thin plate 100, so that the breaking risk of the punch 210 in the blanking process and the resetting process is further reduced, and the processing cost is reduced to a certain extent.
It should be added that the micro hole processing method provided in the embodiment of the present invention can also solve the problem that the micro hole 101 is easily blocked in the conventional micro hole processing method, and specifically, in the step of punching the convex hull 110, the embodiment does not generate any waste, and in the step of forming the hole by grinding, although the convex hull 110 that generates the burr and cannot directly block the micro hole 101, the embodiment does not generate fine, splash and waste that blocks the micro hole 101, so that the micro hole 101 can be prevented from being blocked to a great extent. Furthermore, due to the design that the difference between the height of the punch 210 and the thickness of the thin plate 100 is 0.03-0.05 mm, the situation that the micro-holes 101 are blocked by flash generated in the grinding and hole forming step can be further avoided.
Referring to fig. 5-7, in the present embodiment, the convex hull 110 includes a convex hull flattening section 111 connected to the thin plate 100 and a convex hull grinding section 112 connected to a side of the convex hull flattening section 111 away from the thin plate 100, wherein a height of the convex hull flattening section 111 is less than or equal to a difference between a height of the punch 210 and a thickness of the thin plate 100; in the step of forming the holes by grinding, the convex hull grinding section 112 is firstly ground and removed to expose the base holes 102 formed through the thin plate 100 and the convex hull flattening section 111, and then the convex hull flattening section 111 is flattened and removed to form the fine holes 101 formed through the thin plate 100 based on the base holes 102.
It should be noted here that as the pore diameter of the fine pores 101 decreases, the strength of the thin plate 100 becomes more difficult to form the fine pores 101. In order to solve the problem of deformation or fracture of the thin plate 100 due to insufficient strength, the present embodiment forms the micro holes 101 penetrating the thin plate 100 by grinding and removing the convex hull grinding section 112 and then flattening the convex hull flattening section 111, and avoids a large negative effect on the strength of the thin plate 100 due to the contact grinding operation. It will be further understood that the boundary between the convex hull flattening section 111 and the convex hull grinding section 112 should be within a distance of 0.03-0.05 mm from the thin plate 100, i.e. the base hole 102 extending from the thin plate 100 to the convex hull flattening section 111 is a through hole after grinding and removing the convex hull grinding section 112, so that the micro holes 101 formed after flattening the convex hull flattening section 111 will be through holes. It should be noted that, for the micro holes 101 with a diameter of 0.08mm or more, the micro holes 101 penetrating through the thin plate 100 may be formed by directly grinding and removing the convex hulls 110 on the thin plate 100; for the micro holes 101 with a diameter of less than 0.08mm, the micro holes 101 penetrating the thin plate 100 are formed by grinding and removing the convex hull grinding section 112 and then flattening the convex hull flattening section 111, so as to ensure the strength of the thin plate 100 and avoid deformation or fracture of the thin plate 100.
Referring to fig. 4-5, in the step of punching the convex hulls 110, in the present embodiment, a punch 200 performs a primary punching process on the thin plate 100 to punch the thin plate 100 to form a first convex hull 113 protruding towards one side of the groove 301, and then the thin plate 100 is moved and the punch 200 performs a secondary punching process on the thin plate 100 to punch the punch 210 at a side of the first convex hull 113 to form a second convex hull 114 protruding towards one side of the groove 301, where the first convex hull 113 and the second convex hull 114 together form the convex hull 110. It should be noted that, as the pitch of the micro holes 101 decreases, the strength of the thin plate 100 becomes more difficult to support the formation of the micro holes 101, and thus deformation or fracture is more likely to occur. In order to solve the above problems, in the present embodiment, after a group of first convex hulls 113 having a certain hole distance therebetween are formed by first punching the sheet 100 through the punch 200 and the die 300, the sheet 100 is moved, and then another group of second convex hulls 114 having a certain hole distance therebetween are formed by second punching the sheet 100 through the punch 200 and the die 300 beside the first convex hulls 113, such that the convex hulls 110 having a smaller hole distance therebetween are formed by the first convex hulls 113 and the second convex hulls 114, and the distance between the convex hulls 110 formed in each punching process is maintained, so that the pressure borne by the sheet 100 in each punching process is balanced and buffered, thereby reducing the deformation of the sheet 100 to a certain extent, and ensuring the strength of the sheet 100. It should be noted that, preferably, the second convex hull 114 may be disposed in the middle of the two first convex hulls 113. Preferably, the punch 200 and the die 300 for primary blanking and the punch 200 and the die 300 for secondary blanking may belong to two sets of the punch 200 and the die 300, so that the machining efficiency of the fine hole 101 may be improved to some extent.
Referring to fig. 8, in the present embodiment, in the material preparation step, a thin substrate 400 is further prepared, the thickness of the thin substrate 400 is equal to that of the thin plate 100, and the thin substrate 400 has at least one working plate area and a non-working plate area outside each working plate area; in the step of blanking the convex hull 110, the working plate area is moved and placed on the side surface of the female die 300 opposite to the male die 200, and then the male die 200 performs blanking processing on the working plate area, so that the punch 210 punches the working plate area to form the convex hull 110 which protrudes towards one side of the groove 301; after the step of blanking the convex hulls 110 and before the step of grinding the holes, the micro-hole processing method further includes a step of dividing the thin substrate 400 along the periphery of the work plate area to peel off and form the thin plate 100.
In this embodiment, in the material preparation step, a thin base plate 400 having a thickness equal to that of the thin plate 100 and a plate surface size larger than that of the thin plate 100 is prepared in advance, a work plate region and a non-work plate region are planned on the thin base plate 400, then the work plate regions of the thin base plate 400 are sequentially moved between the die 300 and the punch 200, and the operation of punching the convex hulls 110 is sequentially performed, and then, the thin plate 100 on which the convex hulls 110 are formed is obtained by dividing and stripping along the edges of the work plate regions on which the step of punching the convex hulls 110 is completed. In the present embodiment, the step of punching the convex hull 110 is performed on the thin substrate 400 with a larger face size, and then the thin substrate 400 is divided to obtain the thin plate 100 with a preset size, so as to buffer and eliminate the impact force borne by the thin substrate 400 in the step of punching the convex hull 110, and reduce the deformation amount of the thin substrate 400, thereby reducing the deformation amount of the thin plate 100 finally formed, and ensuring the strength thereof.
It should be noted that, in the step of dividing into plates, the step of dividing the thin substrate 400 along the periphery of the work plate area to peel off and form the thin plate 100 includes dividing the thin substrate 400 along the periphery of one side of the work plate area, and after a certain time of idle buffering, dividing the thin substrate 400 along the periphery of the other side of the work plate area to peel off and form the thin plate 100. With such an arrangement, the thin substrate 400 can self-buffer the impact force applied thereto by the intermediate dead time, so as to further reduce the deformation of the thin substrate 400, thereby further ensuring the strength of the finally formed thin plate 100.
Referring to fig. 8, in the present embodiment, in the material preparation step, two pre-breaking lines 401 are pre-divided at two opposite edges of the working board area; in the dividing into plates step, the thin substrate 400 is extended and divided along the pre-breaking lines 401 to peel off and form the thin plate 100. It should be noted that, by the arrangement of the pre-breaking line 401, on one hand, the subsequent step of dividing into plates can be facilitated, and the thin substrate 400 can be directly divided along the pre-breaking line 401 to obtain the thin plate 100, for example, in the step of dividing into plates, the thin substrate 400 can be firstly extended to the same side of the other pre-breaking line 401 along one side of the one pre-breaking line 401 to be divided, and after the thin substrate is stopped and buffered for a period of time, the thin substrate 400 is extended to the same side of the other pre-breaking line 401 along the other side of the one pre-breaking line 401 to be divided so as to be peeled off and form the thin plate 100, so that the processing efficiency of the micro-hole processing method is improved to a certain extent; on the other hand, the pressure applied to the working plate area in the step of dividing the working plate area into plates can be buffered and reduced in advance, so that the deformation of the finally formed thin plate 100 is reduced to a certain extent.
Referring to fig. 8, in the present embodiment, in the material preparation step, four area identification holes 402 are further formed in the periphery of the working plate area, and each area identification hole 402 is located in the non-working plate area and is commonly used for identifying and dividing one working plate area. It should be noted here that, by the arrangement of the four area identification holes 402, the work board area can be primarily divided on the thin substrate 400, which is beneficial to the uniform division of the work board area on the one hand, and the occurrence of the uneven stress of the thin substrate 400 caused by the uneven division of the work board area is reduced to the maximum extent, thereby further reducing the deformation amount of the thin substrate 400; on the other hand, the method is also beneficial to the implementation of the subsequent step of punching the convex hull 110, is beneficial to the implementation of the step of dividing into plates, and improves the processing efficiency to a certain extent.
Referring to fig. 2-3, in the present embodiment, the radial dimension of the groove 301 is larger than the radial dimension of the convex hull 110, and the depth of the groove 301 is larger than the height of the convex hull 110. It should be noted that, the size of the groove 301 is larger than the size of the convex hull 110, so that the convex hull 110 can be accommodated in the space of the groove 301, and thus, not only can a certain supporting force be formed on the thin plate 100 by the concave die 300 in the step of blanking the convex hull 110, thereby facilitating the blanking operation of the convex hull 200, and further reducing the deformation of the thin plate 100, but also the arrangement of the groove 301 can prevent the formation of the convex hull 110 from being hindered in the step of blanking the convex hull 110, and prevent the negative interference of the punching operation of the punch 210, thereby further preventing the punch 210 from being broken in the blanking process.
Referring to fig. 2-3, in the present embodiment, the radial dimension of the groove 301 gradually decreases from the notch to the groove bottom. It should be noted that, the shape of the groove 301 and the shape of the convex hull 110 or the punch 210 are designed in an analog manner, which is beneficial to realizing the optimized layout of the groove 301 and ensuring the alignment accuracy of the groove 301 and the punch 210, thereby further avoiding the formation of the convex hull 110 being obstructed by the groove 301 and the blanking operation of the punch 210 being interfered by the groove 301, and further avoiding the occurrence of the fracture phenomenon of the punch 210 during the blanking process.
Referring to fig. 2-3, in the present embodiment, the punch 210 is in a cone shape or a circular truncated cone shape. It should be noted that, preferably, the punch 210 is disposed in a conical shape or a circular truncated cone shape, the top end of the punch 210 disposed in this way can condense enough pressure to enable the top end to easily perform the punching operation, and the side surfaces disposed in an inclined manner can buffer and offset the force reacting to the thin plate 100 during the punching process, so as to gradually increase the strength and rigidity thereof, and avoid the fracture phenomenon during the punching process and the retraction resetting process.
Referring to FIG. 7, in this embodiment, the diameter of the micro holes 101 is not less than 0.05 mm. It should be noted that, by setting the aperture of the micro hole 101 to be not less than 0.05mm, on one hand, the strength of the corresponding punch 210 can be ensured, the phenomena of damage and fracture at the top end can be avoided, and the effectiveness of the micro hole processing method can be ensured; on the other hand, the micro holes 101 can be prevented from being blocked by burrs in the step of grinding and forming the holes, thereby further ensuring the effectiveness of the micro hole processing method.
In the method for processing the micro holes according to the embodiment of the present invention, the sheet 100 is placed between the punch 200 and the die 300, and the sheet 100 is punched by the punch 210 of the punch 200 to form the convex hulls 110 protruding toward the groove 301 on the sheet 100, and then the micro holes 101 are exposed by grinding and removing the convex hulls 110. In the method for processing the micro holes provided by the embodiment of the invention, the diameter of the punch 210 is gradually reduced along the radial direction, so that the punch 210 is not only suitable for processing and forming the micro holes 101 with smaller size, but also has certain strength so as to reduce the breaking risk of the punch 210 in the blanking process and the resetting process, and the punch 210 does not need to integrally penetrate through the thin plate 100, so that the breaking risk of the punch 210 in the blanking process and the resetting process is further reduced, and the processing cost is reduced to a certain extent.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A method for machining a fine hole in a thin plate, comprising the steps of:
Preparing a material, namely preparing a male die and a female die, wherein the male die is provided with at least one punch, the diameter of the punch is gradually reduced from the side of the punch connected with the male die to the side of the punch away from the male die, the maximum diameter of the punch is less than 0.2mm, the height of the punch is greater than the thickness of the thin plate, the difference between the height of the punch and the thickness of the thin plate is 0.03-0.05 mm, the male die and the female die are vertically arranged correspondingly, and the side surface of the female die opposite to the male die is provided with a groove corresponding to the punch;
blanking a convex hull, namely placing the thin plate on the side surface of the female die opposite to the male die, and then blanking the thin plate by the male die so as to enable the punch to stamp the thin plate to form the convex hull protruding towards one side of the groove, wherein the convex hull comprises a convex hull flattening section connected with the thin plate and a convex hull grinding section connected with one side, away from the thin plate, of the convex hull flattening section, and the height of the convex hull flattening section is smaller than or equal to the difference between the height of the punch and the thickness of the thin plate;
and grinding to form a hole, grinding and removing the convex hull grinding section to expose and form a base hole penetrating through the thin plate and the convex hull flattening section, flattening and removing the convex hull flattening section to form a micro hole penetrating through the thin plate based on the base hole.
2. A micro-hole machining method according to claim 1, wherein in the step of blanking the convex hulls, the thin plate is subjected to a primary blanking process by the punch to punch the thin plate to form a first convex hull protruding toward the groove side, and the thin plate is moved and subjected to a secondary blanking process by the punch to blank the punch beside the first convex hull to form a second convex hull protruding toward the groove side, the first convex hull and the second convex hull together constituting the convex hull.
3. The micro-hole machining method according to claim 1, wherein, in the material preparation step, a thin substrate having a thickness equal to that of the thin plate is prepared, the thin substrate having at least one work plate area and a non-work plate area outside the work plate area;
in the step of blanking the convex hull, the working plate area is moved and placed on the side face of the female die opposite to the male die, and then the male die performs blanking processing on the working plate area, so that the punch punches on the working plate area to form the convex hull protruding towards one side of the groove;
After the step of blanking the convex hulls and before the step of grinding the holes, the micro-hole processing method further includes:
and cutting the thin substrate along the periphery of the working plate area to peel off and form the thin plate.
4. A micro-hole machining method according to claim 3, wherein in the material preparing step, two pre-broken lines are pre-divided at opposite edges of the work plate area;
in the dividing into plates step, the thin substrate is divided along the pre-breaking line to be peeled off and formed into the thin plate.
5. The micro-hole machining method according to claim 3, wherein in the material preparing step, four area identification holes are further formed in the outer periphery of the work plate area, and each of the area identification holes is located in the non-work plate area and is used in common for identifying and dividing one of the work plate areas.
6. The micro-hole machining method according to claim 1, wherein a radial dimension of the groove is set to be greater than a radial dimension of the convex hull, and a depth of the groove is set to be greater than a height of the convex hull.
7. The method of machining micro holes according to claim 6, wherein the radial dimension of the groove decreases gradually from the groove's base to the groove's base.
8. The method of machining a fine hole of any one of claims 1 to 7, wherein the punch is conical or frustoconical.
9. The micro-hole processing method according to any one of claims 1 to 7, wherein the micro-hole has a hole diameter of not less than 0.05 mm.
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| CN201910649622.XA CN112238176B (en) | 2019-07-18 | 2019-07-18 | Micro-hole machining method |
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| CN201910649622.XA CN112238176B (en) | 2019-07-18 | 2019-07-18 | Micro-hole machining method |
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| CN112238176B true CN112238176B (en) | 2022-07-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2062659U (en) * | 1990-03-27 | 1990-09-26 | 江西光学仪器总厂七分厂 | Micropore punching die |
| JP3736550B2 (en) * | 2002-07-30 | 2006-01-18 | セイコーエプソン株式会社 | Fine hole drilling apparatus, processing method therefor, and liquid jet head manufacturing method using the same |
| JP2007137039A (en) * | 2005-11-23 | 2007-06-07 | Aida Eng Ltd | Nozzle plate, punch used for production thereof and production method thereof |
| CN101989421A (en) * | 2009-07-31 | 2011-03-23 | 吴哲 | Manufacture method of microporous or micro-slit array body and product |
| CN202803907U (en) * | 2012-09-06 | 2013-03-20 | 竹昌精密冲压件(上海)有限公司 | Thin metal micro-punching die |
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