阅读说明：本技术 冲裁模具及其制造方法与利用其冲裁聚酰亚胺薄膜的方法 (Blanking die, method for manufacturing the same, and method for blanking polyimide film using the same ) 是由 曹立林 李杨 王运平 范沛 张飞 杨文斌 于 2020-11-17 设计创作，主要内容包括：本发明涉及一种冲裁模具及其制造方法与利用其冲裁聚酰亚胺薄膜的方法。针对利用精密冲裁设备冲裁聚酰亚胺薄膜时存在的成本高、对冲裁模具加工精度要求非常高,造价昂贵,制造周期长的问题。冲裁模具包括上模板、凸模、凹模及下模板,凸模固定在上模板上,凹模固定在下模板上,凸模与凹模同轴且零间隙配合。制造方法包括制作凸模、预加工凹模、利用凸模加工凹模及对凸模和凹模平磨开刃口的步骤。利用该模具可以对厚度大于等于0.04毫米的有机高分子材料或不锈钢薄板冲裁。本发明采用凸模与凹模间相互啃切形成零间隙配合,模具制造时无需考虑配合间隙,模具制造周期缩短一半左右,成本可降低50％左右。(The present invention relates to a blanking die, a method of manufacturing the same, and a method of blanking a polyimide film using the same. The problems of high cost, very high requirement on the processing precision of a punching die, high manufacturing cost and long manufacturing period existing when the polyimide film is punched by using fine blanking equipment are solved. The blanking die comprises an upper die plate, a male die, a female die and a lower die plate, wherein the male die is fixed on the upper die plate, the female die is fixed on the lower die plate, and the male die and the female die are coaxial and are in zero clearance fit. The manufacturing method comprises the steps of manufacturing a male die, preprocessing the female die, processing the female die by utilizing the male die and flatly grinding the cutting edge of the male die and the female die. The die can be used for punching organic polymer materials or stainless steel sheets with the thickness of more than or equal to 0.04 mm. According to the invention, zero clearance fit is formed by mutually gnawing and cutting the male die and the female die, the fit clearance is not required to be considered during the die manufacturing, the die manufacturing period is shortened by about half, and the cost can be reduced by about 50%.)

1. A blanking die is characterized in that: the die comprises an upper die plate (2), a male die (8), a female die (4) and a lower die plate (5), wherein the male die (8) is fixed on the upper die plate (2), the female die (4) is fixed on the lower die plate (5), and the male die (8) is coaxial with the female die (4) and is in zero clearance fit.

2. The blanking die of claim 1, wherein: the stamping die is characterized by further comprising a male die fixing plate (3), and the male die (8) is fixed on the upper die plate (2) through the male die fixing plate (3).

3. The blanking die of claim 2, wherein: the device also comprises a piece withdrawing device (7) and an ejector rod (6); move back a ware (7) and be located die (4) type hole, ejector pin (6) are from supreme lower bolster (5) of passing down, stretch into die (4) type hole in and move back a ware (7) and be connected.

4. A method of manufacturing a blanking die as set forth in any of claims 1-3, characterized by comprising the steps of:

step 1, manufacturing a male die;

selecting a raw material with the hardness of a to manufacture a male die, wherein a is a positive number;

step 2, preprocessing a female die;

selecting a raw material with the hardness of b to pre-process the female die, wherein the size of a profile hole of the pre-processed female die is 0.1-0.2mm smaller than that of the periphery of the male die; wherein b is a positive number and b is less than a;

step 3, processing a female die by using a male die;

ensuring the relative positions of the male die and the preprocessed female die in the step 2, and gradually cutting the male die into the die hole of the preprocessed female die by 0.5-1 mm to form a gnawing cutting edge;

and 4, flat grinding cutting edges of the male die and the female die.

5. The blanking die manufacturing method of claim 4, wherein in step 1: selecting CrWMn to manufacture a male die, wherein the heat treatment hardness is HRC 58-62; in the step 2, pre-hard steel NAK80 is selected to pre-process a female die, and the factory hardness is HB 340-380.

6. A method for blanking a polyimide film is characterized by comprising the following steps:

step 1, manufacturing a male die;

selecting a raw material with the hardness of a to manufacture a male die, wherein a is a positive number;

step 2, preprocessing a female die;

selecting a raw material with the hardness of b to pre-process the female die, wherein the size of a profile hole of the pre-processed female die is 0.1-0.2mm smaller than that of the periphery of the male die; wherein b is a positive number and b is less than a;

step 3, processing a female die by using a male die;

ensuring the relative positions of the male die and the preprocessed female die in the step 2, and gradually cutting the male die into the die hole of the preprocessed female die by 0.5-1 mm to form a gnawing cutting edge;

step 4, flat grinding cutting edges of the male die and the female die;

and 5, blanking the organic polymer material or the stainless steel sheet with the thickness of more than or equal to 0.04 mm.

7. The method for blanking a polyimide film according to claim 6, wherein the step 3 is specifically: fixing a male die on a sliding block of a punch press, and fixing a female die on a workbench of the punch press after preprocessing; ensuring the relative positions of the male die and the preprocessed female die in the step 2, and gradually cutting the male die into the die hole of the preprocessed female die by 0.5-1 mm to form a gnawing cutting edge;

the step 5 specifically comprises the following steps: and flatly paving an organic polymer material or a stainless steel sheet with the thickness of more than or equal to 0.04mm on the surface of the female die, and driving the male die to go down by a punch press for blanking.

8. The method for blanking a polyimide film according to claim 7, wherein the step 3 is specifically: fixing a male die on a workbench of a punch press, and fixing a female die on a slide block of the punch press after preprocessing; ensuring the relative positions of the male die and the preprocessed female die in the step 2, and gradually cutting the male die into the die hole of the preprocessed female die by 0.5-1 mm to form a gnawing cutting edge;

the step 5 specifically comprises the following steps: and flatly paving an organic polymer material or a stainless steel thin plate with the thickness of more than or equal to 0.04mm on the surface of the male die, and driving the female die to face downwards by a punch press for blanking.

Technical Field

The present invention relates to a method for manufacturing a blanking die, and more particularly, to a blanking die, a method for manufacturing the same, and a method for blanking a polyimide film using the same.

Background

The polyimide film is made of an organic polymer material with the thickness of 0.04mm through blanking, has high temperature resistance and insulation resistance, and is widely applied to fuel accessory systems of aircraft engines. The ultra-thin stamping parts generally adopt fine blanking equipment, and have high requirements and high use and maintenance costs; and the requirement of blanking die clearance is 0.002 mm, the requirement of processing precision is very high, the manufacturing cost is expensive, and the manufacturing period is long.

In order to shorten the research and development and manufacturing period of aviation products, the problems that the manufacturing cost of a die is reduced and the processing period is shortened under the condition of the existing common blanking equipment are urgently solved at present.

Disclosure of Invention

The problems of high cost, very high requirement on the processing precision of a punching die, high manufacturing cost and long manufacturing period existing when the polyimide film is punched by using fine blanking equipment are solved. The invention provides a method for manufacturing a blanking die and a method for blanking a polyimide film by using the same, which realize the die for blanking the polyimide film with the thickness of 0.04mm under the condition of the existing equipment resources, reduce the manufacturing cost of the blanking die, shorten the processing period and realize the high-quality processing of polyimide film parts.

The technical scheme of the invention is to provide a blanking die, which is characterized in that: the punch die comprises an upper die plate, a punch die, a female die and a lower die plate, wherein the punch die is fixed on the upper die plate, the female die is fixed on the lower die plate, and the punch die and the female die are coaxial and are in zero clearance fit.

Further, the blanking die further comprises a male die fixing plate, and the male die is fixed on the upper die plate through the male die fixing plate.

Further, the blanking die also comprises a piece withdrawing device and an ejector rod; the piece withdrawing device is positioned in the concave model hole, and the ejector rod penetrates through the lower template from bottom to top and extends into the concave model hole to be connected with the piece withdrawing device.

The invention also provides a manufacturing method of the blanking die, which comprises the following steps:

step 1, manufacturing a male die;

selecting a raw material with the hardness of a to manufacture a male die, wherein a is a positive number;

step 2, preprocessing a female die;

selecting a raw material with the hardness of b to pre-process the female die, wherein the size of a profile hole of the pre-processed female die is 0.1-0.2mm smaller than that of the periphery of the male die; wherein b is a positive number and b is less than a;

step 3, processing a female die by using a male die;

ensuring the relative positions of the male die and the preprocessed female die in the step 2, and gradually cutting the male die into the die hole of the preprocessed female die by 0.5-1 mm to form a gnawing cutting edge;

and 4, flat grinding cutting edges of the male die and the female die.

Further, in step 1: selecting CrWMn to manufacture a male die, wherein the heat treatment hardness is HRC 58-62; in the step 2, pre-hard steel NAK80 is selected to pre-process a female die, and the factory hardness is HB 340-380.

The invention also provides a method for blanking the polyimide film, which comprises the following steps:

step 1, manufacturing a male die;

selecting a raw material with the hardness of a to manufacture a male die, wherein a is a positive number;

step 2, preprocessing a female die;

selecting a raw material with the hardness of b to pre-process the female die, wherein the size of a profile hole of the pre-processed female die is 0.1-0.2mm smaller than that of the periphery of the male die; wherein b is a positive number and b is less than a;

step 3, processing a female die by using a male die;

ensuring the relative positions of the male die and the preprocessed female die in the step 2, and gradually cutting the male die into the die hole of the preprocessed female die by 0.5-1 mm to form a gnawing cutting edge;

step 4, flat grinding cutting edges of the male die and the female die;

and 5, blanking the organic polymer material or the stainless steel sheet with the thickness of more than or equal to 0.04 mm.

Further, fixing a male die on a sliding block of a punch press, and fixing a female die on a workbench of the punch press after preprocessing; ensuring the relative positions of the male die and the preprocessed female die in the step 2, and gradually cutting the male die into the die hole of the preprocessed female die by 0.5-1 mm to form a gnawing cutting edge;

the step 5 specifically comprises the following steps: and flatly paving an organic polymer material or a stainless steel sheet with the thickness of more than or equal to 0.04mm on the surface of the female die, and driving the male die to go down by a punch press for blanking.

Further, fixing a male die on a workbench of a punch press, and fixing a female die on a sliding block of the punch press after preprocessing; ensuring the relative positions of the male die and the preprocessed female die in the step 2, and gradually cutting the male die into the die hole of the preprocessed female die by 0.5-1 mm to form a gnawing cutting edge;

the step 5 specifically comprises the following steps: and flatly paving an organic polymer material or a stainless steel thin plate with the thickness of more than or equal to 0.04mm on the surface of the male die, and driving the female die to face downwards by a punch press for blanking.

The invention has the beneficial effects that:

1. according to the invention, zero clearance fit is formed by mutually gnawing and cutting the male die and the female die, the fit clearance is not required to be considered during the die manufacturing, the die manufacturing period is shortened by about half, and the cost can be reduced by about 50%.

2. The male die and the female die are in zero-clearance fit, so that the problem of large burrs or deformation of a product due to large die clearance or assembly error is solved, and the defective rate is greatly reduced;

3. the invention has no special requirement on equipment, can be realized by using common blanking equipment, is easy to popularize and apply, and is suitable for punching a polyimide film with the thickness of 0.04mm, a stainless steel sheet with the thickness of 0.1mm, a polyethylene plastic film with the thickness of 0.3mm and a cloth-sandwiched rubber film with the thickness of 0.5 mm.

Drawings

Fig. 1 is a schematic structural view of a blanking die in the embodiment.

The reference numbers in the figures are: 1-a floating die shank component, 2-an upper die plate, 3-a male die fixing plate, 4-a female die, 5-a lower die plate, 6-a top rod, 7-a part withdrawing device, 8-a male die, 9-a discharging spring and 10-a backing plate.

Detailed Description

The invention is further described with reference to the following figures and specific embodiments.

The invention can process the die by using common blanking equipment and simultaneously complete the processing of film parts, and can be suitable for punching a polyimide film with the thickness of 0.04mm, a stainless steel sheet with the thickness of 0.1mm, a polyethylene plastic film with the thickness of 0.3mm and a cloth-sandwiched rubber film with the thickness of 0.5 mm. The following examples are described with reference to polyimide films having a thickness of 0.04 mm.

As can be seen from fig. 1, the polyimide film blanking die of the embodiment mainly includes a floating die shank 1, an upper die plate 2, a punch retainer 3, a female die 4, a lower die plate 5, a carrier rod 6, a stripper 7, a punch 8, a discharge spring 9, and an upper die cushion plate 10. The floating die shank 1 and the male die 8 are connected and arranged on the upper die plate 2, the upper die base plate 10 is positioned between the upper die plate 2 and the male die 8, and the male die 8 is further fixed by the male die fixing plate 3. The middle part of the female die 4 fixed on the lower template 5 by a pin corresponds to the male die 8 on the same axis. The part withdrawing device 7 is positioned in the type hole of the female die 4, and the ejector rod 6 penetrates through the lower die plate 5 from bottom to top and extends into the type hole of the female die 4 to be connected with the part withdrawing device 7. Unlike the prior art, the male mold 8 and the female mold 4 in this embodiment have zero clearance fit, rather than being machined conventionally to 0.002 mm. The polyimide film is blanked by using the die, and the problem of large burrs or deformation of a product due to large die clearance or assembly error can be avoided because no clearance exists between the male die 8 and the female die 4, so that the yield is obviously improved.

In order to realize zero clearance fit between the male die 8 and the female die 4, the mold is manufactured by the following method in the embodiment:

step 1, manufacturing a male die;

the male die is prepared from a CrWMn material, and the heat treatment hardness of the material is HRC 58-62.

Step 2, preprocessing a female die;

the female die selects pre-hardened steel NAK80 with lower hardness, and the factory hardness is HB 340-380; meanwhile, the size of the die hole of the female die is 0.1mm smaller than that of the male die along the periphery during preprocessing.

Step 3, processing a female die by using a male die;

before the male die and the female die are not mutually bitten and cut, the relative positions of the male die and the female die are ensured by a die assembly bench worker, the whole set of tooling is clamped on a punch after the assembly is finished, the male die 8 is fixed on the upper die plate 2 through a male die fixing plate 3, the female die 4 is fixed on the lower die plate 5 through a pin and a screw, the whole upper die part is arranged on a punch slide block through a floating die shank component, and the lower die is ensured to be in the relative position with the upper die by a ball guide pillar and is fixed by a pressing plate. When the device works, the uniform clearance between the male die and the female die is ensured, and no offset exists.

And starting the machine tool, adjusting the height of the slide block, and enabling the male die to gradually cut into the mouth part of the female die by 0.5-1 mm to form a gnawing cutting edge.

Step 4, flat grinding cutting edges of the male die and the female die;

and (3) after the die is detached from the punch, the male die 8 and the female die 4 are subjected to flat grinding to form cutting edges, and then the die is reassembled.

When the mold is used for processing the polyimide film, the organic polymer material with the thickness of 0.04mm is flatly paved on the upper surface of the female mold 4, so that the male mold gradually cuts into the opening part of the female mold, the size of the obtained polyimide film meets the requirement of a design drawing, and the section has no burrs.

In order to obtain a wider processing range, an inverted structure can be adopted, organic polymer material with the thickness of 0.04mm is flatly paved on the upper surface of the male die, the female die is driven to move downwards by the sliding block, and the male die cuts into the opening part of the female die to complete punching.