Punching die and method of manufacturing the same

Abstract

The application discloses a punching punch and a manufacturing method thereof, and relates to the technical field of die manufacturing; the manufacturing method of the punching punch comprises the following steps: performing through grinding treatment on a large-outer-diameter part of a punching punch blank; manufacturing an axial air hole and various levels of steps on the punching punch blank; performing fine grinding on a head part of the punching punch blank, and processing an edge; taking the large-outer-diameter part of the punching punch blank as a reference, performing step grinding on a small-outer-diameter part of the edge; and performing fine flat grinding on the edge. The application can improve the manufacturing precision of the punching punch, so that the punching punch can be better installed on a punch fixing plate and better matched with a punching female die, thereby improving the processing quality of air conditioner fins.

Description

Technical Field

[0001] This invention belongs to the field of mold manufacturing technology, and specifically relates to a punching punch and its manufacturing method. Background Technology

[0002] Air conditioner fins are stamped using fin molds, and the manufacturing precision of the fin molds affects the processing quality of the air conditioner fins. For example, utility model patent CN203578568U discloses a composite molding mold for heat exchanger fins, and utility model patent CN211757912U discloses a punching device, air conditioner fins, and an air conditioner. It can be seen that the structure of the fin mold typically includes a punch fixing plate, a die fixing plate, a punching punch, and a punching die. Multiple punches are mounted on the punch fixing plate, and multiple punches are mounted on the die fixing plate. Each punching punch cooperates with a corresponding punching die to complete the punching work on the aluminum foil fins.

[0003] However, the existing manufacturing methods for processing punching punches result in poor manufacturing precision. This leads to poor assembly precision between the punch and the punch fixing plate, as well as poor fit precision between the punch and the punch die. Consequently, the manufactured air conditioner fins are of poor quality, with numerous and large burrs and other processing defects that require cleaning. This increases processing costs and time, which is detrimental to improving the company's economic efficiency. Summary of the Invention

[0004] To address the aforementioned technical problems, the present invention aims to provide a punching punch and its manufacturing method, which can improve the manufacturing precision of the punching punch, enabling the punching punch to be better mounted on the punch fixing plate and to better cooperate with the punching die, thereby improving the processing quality of air conditioning fins.

[0005] The technical solution adopted to solve the above-mentioned technical problems is as follows:

[0006] The first aspect of this invention discloses a method for manufacturing a punching punch, comprising the following steps:

[0007] The outer diameter portion of the punch blank is subjected to through grinding.

[0008] Axial pores and steps of various levels are manufactured on the punch blank;

[0009] The head of the punch blank is precision ground and a cutting edge is machined.

[0010] Using the large outer diameter of the punch blank as a reference, the small outer diameter of the cutting edge is subjected to step grinding.

[0011] The cutting edge is then finely ground.

[0012] The manufacturing method of the punching punch provided in the first aspect of the present invention has at least the following beneficial effects: First, the large outer diameter portion of the punching punch blank is machined through a grinding process to improve the coaxiality accuracy of the large outer diameter portion of the punching punch, enabling the large outer diameter portion of the punching punch to be mounted on the punch fixing plate with high precision, thereby reducing the assembly error between the punching punch and the punch fixing plate; then, after completing the grinding process, axial vents and steps of various levels are manufactured to improve the coaxiality accuracy of the steps and axial vents; after completing the manufacturing processes of the axial vents and steps, the head of the punching punch blank is precision ground. The process involves manufacturing a cutting edge to allow the punching punch to engage with the punching die to cut the punching waste from the aluminum foil fins. Next, using the large outer diameter of the punching punch blank as a reference, the small outer diameter of the cutting edge is subjected to stepped grinding to machine it to the required design dimensions. Subsequently, the cutting edge of the punching punch is finished through a precision grinding process to achieve the required surface finish. This allows the punching punch to engage with the punching die, quickly and easily cutting away the punching waste from the aluminum foil fins, thereby improving the processing quality of the air conditioning fins and reducing burr generation.

[0013] In some embodiments of the present invention, in the step of grinding the outer diameter portion of the punch blank, the grinding is performed according to the design size of the outer diameter portion of the punch + 0.2 mm, and the consistency of the outer diameter portion is ensured to be ±0.02 mm.

[0014] In some embodiments of the present invention, in the step of manufacturing axial air holes and steps of various levels on the punching punch blank, steps of various levels are manufactured by clamping the large outer diameter portion of the punching punch, with a 0.15mm allowance on each side of the outer diameter of the step, and ensuring coaxiality <0.05mm.

[0015] In some embodiments of the present invention, in the step of fine grinding the head of the punch blank and machining the cutting edge, the punch blank is fixed by a double-center clamping method and the outer diameter is ground so that the outer diameter of the cutting edge has a machining allowance of 0.01mm to 0.02mm.

[0016] In some embodiments of the present invention, in the step of stepping the small outer diameter of the cutting edge with the large outer diameter of the punch blank as a reference, a 100# grinding wheel is used to process the small outer diameter of the cutting edge to the required position and to ensure a surface finish of 0.4.

[0017] In some embodiments of the present invention, the fine grinding of the cutting edge includes the following steps:

[0018] Grind the cutting edge using a 60# grinding wheel with a feed rate of 0.03mm per pass, leaving a machining allowance of 0.01mm;

[0019] Use an 80# grinding wheel to grind the cutting edge to the required depth with a feed rate of 0.002mm per pass, ensuring a surface finish of 0.4.

[0020] In some embodiments of the present invention, after the step of fine grinding the head of the punch blank and machining the cutting edge, the following steps are further included: rough grinding the outer diameter portion of the punch blank, leaving a machining allowance of 0.05 mm to 0.08 mm; fine grinding the outer diameter portion of the punch blank according to the design dimension of ±0.0015 mm of the outer diameter portion of the punch, and ensuring that the coaxiality reaches 0.003 mm.

[0021] In some embodiments of the present invention, after the step of manufacturing axial pores and steps of various levels on the punching die blank, the following step is further included: heat treating the punching die blank to make the hardness of the punching die blank reach the design requirements and make the deformation <0.1mm.

[0022] In some embodiments of the present invention, after the step of fine grinding the head of the punch blank and machining the cutting edge, the following step is also included: using the large outer diameter of the punch blank as a reference, an 80# grinding wheel is used to manufacture a 3mm long inverted cone at the end of the punch blank.

[0023] A second aspect of the present invention discloses a punching punch, which is manufactured using the punching punch manufacturing method of the first aspect embodiment.

[0024] The punching die provided in the second aspect of the present invention has at least the following beneficial effects: by using the above-described manufacturing method of the punching die, a punching die with high manufacturing precision can be produced, reducing the assembly error between the punching die and the punch fixing plate and the matching error between the punching die and the punch die, so that the punching die can be better installed on the punch fixing plate and can better match the punching die on the die fixing plate, thereby producing air conditioning fins of better quality.

[0025] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0027] Figure 1 This is a schematic flowchart of the manufacturing method of the punching punch provided in the embodiment of the present invention;

[0028] Figure 2 This is a detailed flowchart of step S500 in the manufacturing method of the punching punch provided in the embodiment of the present invention.

[0029] Figure 3 This is a partial flowchart illustrating a method for manufacturing a punching die according to another embodiment of the present invention.

[0030] Figure 4 This is a partial flowchart illustrating a method for manufacturing a punching die according to another embodiment of the present invention.

[0031] Figure 5 This is a partial flowchart illustrating a method for manufacturing a punching die according to another embodiment of the present invention. Detailed Implementation

[0032] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0033] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0034] In the description of this invention, the use of terms such as "a number" means one or more, with "more than" meaning two or more. Terms like "greater than," "less than," and "exceeding" are understood to exclude the stated number, while terms like "above," "below," and "within" are understood to include the stated number. The use of terms like "first," "second," and "third" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, the number of indicated technical features, or the sequential relationship between indicated technical features.

[0035] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0036] Reference Figures 1 to 5 The following are several embodiments of the punching punch and its manufacturing method of the present invention.

[0037] like Figures 1 to 5As shown, Embodiment 1 of the present invention provides a method for manufacturing a punching punch. This method can manufacture a punching punch used in the processing of air conditioner fins, and can improve the manufacturing accuracy of the punching punch, resulting in high assembly accuracy between the punching punch and the punch fixing plate, and high fitting accuracy between the punching punch and the punch die. This allows the punching punch to be better mounted on the punch fixing plate and to better fit with the punch die, thereby significantly improving the processing quality of air conditioner fins, reducing the processing cost and time of air conditioner fins, and ultimately improving the economic benefits of enterprises.

[0038] like Figure 1 and Figure 2 As shown, the manufacturing method of the punching punch in this embodiment includes the following steps:

[0039] Step S100: Perform through grinding on the large outer diameter portion of the punch blank.

[0040] Specifically, in step S100, the punch blank is ground using a centerless grinder with the design dimension of the outer diameter of the punch plus 0.2mm, and the consistency of the outer diameter is kept within ±0.02mm.

[0041] Understandably, before the grinding process begins, workers first retrieve raw materials from the warehouse with a diameter of Ф+0.3mm and a length of L+0.5mm, i.e., the punch blank. After preparing the materials, the cutting process can begin. Specifically, using wire cutting equipment, the punch blank is wire-cut according to the design length dimension +0.5mm in the drawing, ensuring that the two end faces of the punch are flat. The cross-sectional shape of the punch blank is circular.

[0042] Step S200: Create axial pores and steps of various levels on the punch blank.

[0043] Specifically, in step S200, axial air holes are first machined on the punching die using the center drill bit of a conventional lathe. The extension direction of the axial air holes is consistent with the length direction of the punching die blank. The axial air holes penetrate both end faces of the punching die blank, and the chamfer of the axial air hole opening is 60° × 0.5. The axial air holes are designed to allow for the use of high-pressure gas to blow the punching waste towards the blanking hole.

[0044] Furthermore, when axial air holes are provided, side oil holes can be machined into the punch blank using a drilling machine. These side oil holes are connected to the axial air holes. The side oil holes are designed to allow lubricating oil to pass through, thus providing lubrication.

[0045] Then, using a conventional lathe, the large outer diameter portion of the punching punch is clamped, and machining is employed to manufacture various steps. Furthermore, the outer diameter of each step on the punching punch has a 0.15mm allowance on one side, ensuring coaxiality <0.05mm. Additionally, an annular groove can be machined on the punching punch, with a 0.2mm allowance on one side.

[0046] Step S300: Grind the head of the punch blank and machine the cutting edge.

[0047] Specifically, in step S300, an external cylindrical grinding machine is used to fix the position of the punch blank by means of double center clamping, and the head of the punch blank is externally ground to process the cutting edge, so that the outer diameter of the cutting edge has a machining allowance of 0.01mm to 0.02mm, and the outer diameter accuracy of the cutting edge is +0.02mm.

[0048] Step S400: Using the large outer diameter of the punch blank as a reference, perform stepped grinding on the small outer diameter of the cutting edge.

[0049] Specifically, in step S400, the large outer diameter of the punch blank is used as the machining reference, and the small outer diameter of the cutting edge is machined by step grinding with a 100# grinding wheel of a step grinder, and the machining is completed in place. In addition, the surface finish of the small outer diameter of the cutting edge is guaranteed to reach 0.4, that is, the roughness Ra value is 0.4.

[0050] Step S500: Perform fine grinding on the cutting edge.

[0051] Specifically, step S500 includes the following steps:

[0052] Step S501: Grind the cutting edge with a 60# grinding wheel at a feed rate of 0.03mm per pass, leaving a machining allowance of 0.01mm.

[0053] Step S502: Use an 80# grinding wheel to grind the cutting edge to the required depth with a feed rate of 0.002mm per pass, ensuring a surface finish of 0.4.

[0054] In the fine surface grinding process, an M7120 surface grinder is used to finish the cutting edge. First, a 60# grinding wheel is used with a feed rate of 0.03mm, and the cutting edge is continuously ground through multiple feeds. Then, an 80# grinding wheel is used with a feed rate of 0.002mm, and the cutting edge is continuously ground through multiple feeds to ensure that the cutting edge dimensions and surface finish meet the design requirements. Because the abrasive grains of the 80# grinding wheel are smaller than those of the 60# grinding wheel, the cutting edge is first rough ground and then fine ground, improving the processing efficiency and surface finish. This improves the cutting effect on the punching waste of aluminum foil fins, thereby reducing the number and size of burrs on the aluminum foil fins.

[0055] In the manufacturing method of the punching punch provided in this embodiment, the large outer diameter portion of the punching punch blank is first machined through a grinding process to improve the coaxiality accuracy of the large outer diameter portion of the punching punch, enabling the large outer diameter portion of the punching punch to be mounted on the punch fixing plate with high precision and reducing the assembly error between the punching punch and the punch fixing plate. Then, after completing the grinding process, axial vents and steps of various levels are manufactured to improve the coaxiality accuracy of the steps and axial vents. After completing the manufacturing processes of the axial vents and steps, the head of the punching punch blank is precision ground and a cutting edge is manufactured. This process allows the punching punch to engage with the punching die to cut the punching waste from the aluminum foil fins. Next, using the large outer diameter of the punching punch blank as a reference, the small outer diameter of the cutting edge is subjected to stepped grinding to machine it to the required design dimensions. Subsequently, the cutting edge of the punching punch is treated with a fine grinding process to achieve the required surface finish. This allows the punching punch to engage with the punching die, quickly and easily cutting away the punching waste from the aluminum foil fins, thereby improving the processing quality of the air conditioning fins and reducing burr generation.

[0056] In some embodiments, such as Figure 1 and Figure 3 As shown, after step S300, which is the step of precision grinding the head of the punch blank and machining the cutting edge, the manufacturing method of the punch further includes the following steps:

[0057] Step S310: Roughly grind the outer diameter of the punch blank, leaving a machining allowance of 0.05mm to 0.08mm.

[0058] Step S320: Grind the outer diameter of the punch blank according to the design dimension of ±0.0015mm of the outer diameter of the punch, and ensure that the coaxiality reaches 0.003mm.

[0059] Specifically, using a centerless grinder, the punch blank is first rough-ground, leaving a margin of 0.05mm to 0.08mm for subsequent finish grinding. After rough grinding, the punch blank is then finish-ground to a tolerance of ±0.0015mm; simultaneously, the coaxiality of the large outer diameter portion of the punch blank is ensured to be 0.003mm. This completes the machining of the large outer diameter portion of the punch, allowing for precise mounting of the punch onto the punch holder plate.

[0060] In some embodiments, such as Figure 1 and Figure 4 As shown, after step S200, that is, the step of manufacturing axial pores and steps of various levels on the punch blank, the manufacturing method of the punch further includes the following steps:

[0061] Step S210: Heat treat the punch blank to make the hardness of the punch blank meet the design requirements and make the deformation <0.1mm.

[0062] Specifically, heat treatment equipment is used to perform a heat treatment process on the punch blank according to the hardness requirements of the drawing, in order to increase the hardness and strength of the punch, while ensuring that the deformation of the punch blank is less than 0.1mm. After completing step S210, step S300 is then executed.

[0063] Of course, between steps S210 and S300, the following step may also be included: grinding the tapered openings of the axial air holes in the punch blank using a grinding head of an instrument lathe. Specifically, the punch blank is clamped, aligned to ensure a runout value < 0.1 mm, and the tapered openings at both ends of the punch blank are gently ground using a 60° grinding head.

[0064] In some embodiments, such as Figure 1 and Figure 5 As shown, after step S300, which is the step of precision grinding the head of the punch blank and machining the cutting edge, the manufacturing method of the punch further includes the following steps:

[0065] Step S330: Using the large outer diameter of the punch blank as a reference, use an 80# grinding wheel to create a 3mm long inverted cone at the end of the punch blank.

[0066] Specifically, using an 80# grinding wheel on an external grinding machine, the end of the punch blank is machined with the large outer diameter portion as a reference to create a 3mm long inverted taper. After completing step S320, step S330 is executed.

[0067] In addition, between steps S320 and S330, the following steps are included: using a conventional lathe, the punch blank is chamfered according to the design requirements of the drawing. When clamping the punch blank, copper foil is used to cover the clamped part of the punch blank to prevent damage during clamping. Then, the punch blank is cleaned. Since the punch blank has various steps, but the 90° angle of the step is not allowed to have a radius (R), the cleaning must be done at a 90° angle. Next, an annular groove is machined on the punch blank, ensuring that the dimensions of each step meet the design requirements.

[0068] In some embodiments, between steps S330 and S400, the following steps are also included: using an M7120 surface grinder to clamp and fix the small outer diameter part of the punching punch blank, using the inner end face as a reference, using an 80# grinding wheel to process the large end face of the punching punch, and ensuring a surface finish of 0.4, while the perpendicularity is <0.005mm.

[0069] In some embodiments, between steps S400 and S500, the following steps are also included: using the dressing wheel of a small flat grinder to grind the bottom of the punch blank and machine a V-groove, and machining it in place; then, using copper sheet to cover the large outer diameter of the punch blank and clamping and fixing the large outer diameter of the punch blank, applying polishing paste such as W20 polishing paste to the cork surface, and polishing the outer diameter of the cutting edge of the punch blank to 0.2.

[0070] Following step S500, the following steps are also included: clamping the punch blank with a fixture and removing burrs from the cutting edge; then, placing the punch blank into an ultrasonic cleaner for cleaning, followed by checking for any residue in the punch blank to obtain the finished punch. Next, according to the drawing, the finished punch is inspected using a magnifying glass and a coaxiality tester.

[0071] The above-described method for manufacturing punches can reduce the cost of raw materials, shorten the processing cycle, and improve the precision and stability of the punches.

[0072] In addition, this embodiment of the invention also provides a punching punch, which is manufactured using a punching punch manufacturing method.

[0073] By adopting the above-mentioned manufacturing method for punching punches, high-precision punching punches can be produced, reducing assembly errors between the punching punch and the punch fixing plate, as well as matching errors between the punching punch and the punch die. This improves the assembly and machining accuracy of the punching punch, allowing it to be better mounted on the punch fixing plate and better matched with the punching die on the die fixing plate, thereby producing higher-quality air conditioning fins.

[0074] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A method for manufacturing a punching punch, characterized in that, The steps include the following: The outer diameter portion of the punch blank is subjected to through grinding. Axial pores and steps of various levels are manufactured on the punch blank; The head of the punch blank is precision ground and a cutting edge is machined. Using the large outer diameter of the punch blank as a reference, the small outer diameter of the cutting edge is subjected to step grinding. The cutting edge is finely ground; In the step of step grinding the small outer diameter of the cutting edge using the large outer diameter of the punch blank as a reference, a 100# grinding wheel is used to process the small outer diameter of the cutting edge to the required position and ensure a surface finish of 0.

4. The fine grinding of the cutting edge includes the following steps: Grind the cutting edge using a 60# grinding wheel with a feed rate of 0.03mm per pass, leaving a machining allowance of 0.01mm; Use an 80# grinding wheel to grind the cutting edge to the required depth with a feed rate of 0.002mm per pass, ensuring a surface finish of 0.

4. After the step of precision grinding the head of the punch blank and machining the cutting edge, the following steps are also included: rough grinding the outer diameter portion of the punch blank, leaving a machining allowance of 0.05mm to 0.08mm; precision grinding the outer diameter portion of the punch blank according to the design dimension of ±0.0015mm of the outer diameter portion of the punch, and ensuring that the coaxiality reaches 0.003mm; After the step of precision grinding the head of the punch blank and machining the cutting edge, the following step is also included: using the large outer diameter of the punch blank as a reference, an 80# grinding wheel is used to manufacture a 3mm long inverted cone at the end of the punch blank.

2. The method for manufacturing a punching punch according to claim 1, characterized in that, In the step of grinding the outer diameter portion of the punch blank, the grinding is performed according to the design dimension of the outer diameter portion of the punch + 0.2mm, and the consistency of the outer diameter portion is ensured to be ±0.02mm.

3. The method for manufacturing a punching punch according to claim 1, characterized in that, In the step of manufacturing axial air holes and steps of various levels on the punching punch blank, steps of various levels are manufactured by clamping the large outer diameter part of the punching punch. The outer diameter of the step has a 0.15mm allowance on each side and the coaxiality is ensured to be <0.05mm.

4. The method for manufacturing a punching punch according to claim 1, characterized in that, In the step of precision grinding the head of the punch blank and machining the cutting edge, the punch blank is fixed by a double-center clamping method and the outer diameter is ground so that the outer diameter of the cutting edge has a machining allowance of 0.01mm to 0.02mm.

5. The method for manufacturing a punching die according to claim 1, characterized in that, After the step of manufacturing axial pores and steps of various levels on the punch blank, the following step is also included: heat treating the punch blank to make the hardness of the punch blank meet the design requirements and make the deformation <0.1mm.

6. A punching die, characterized in that, It is manufactured using the punching die manufacturing method as described in any one of claims 1 to 5.

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