Stamping die capable of improving blanking utilization rate of chain plate

Abstract

A stamping die capable of improving the blanking utilization rate of a chain plate comprises a progressive die body, the progressive die body comprises an upper die and a lower die, an advancing channel for a steel belt to penetrate through is formed between the upper die and the lower die, and the advancing channel is sequentially provided with a punching station and a blanking station. And the punching nails at the punching station and the punches at the blanking station are arranged in a staggered and inclined manner. A staggered and inclined arrangement mode is adopted, compared with a straight arrangement mode of 0.002874 pieces / mm < 2 >, an inclined arrangement mode of 0.003013128 pieces / mm < 2 > is adopted, and therefore the blanking rate is increased.

Description

Technical Field

[0001] The present invention belongs to the technical field of link plate blanking processing, and particularly relates to a stamping die for improving the blanking utilization rate of link plates. Background Art

[0002] There are mainly two types of link plate stamping, namely compound dies and progressive dies. The main characteristics of progressive dies are that multiple forming operations can be completed in one set of dies by dividing the working steps. The die stroke is short, the stamping efficiency is high, the material utilization rate is high, the service life of vulnerable parts is long, and the production cost is low. The main disadvantages of progressive dies are that the punching and the external shape punching are stressed in the same direction, the flatness of the link plate is low, the perpendicularity of the shearing surface of the hole diameter is low, and it is easy to break from the inner hole under high-load operation, resulting in chain breakage during use; in addition, feeding jamming or positioning problems are likely to cause concentricity deviation between the link plate holes and the outer circle of the head width, resulting in problems such as crooked holes and different sizes at both ends. The basic steps of progressive die stamping processing are: steel strip feeding - pre-punching - fine punching - blanking, and the parts and punching waste are discharged from under the lower die holder. The punching waste is divided into two types: process waste and structural waste. The tab and the remnant are process wastes, which are wastes related to the layout method and stamping method, and the structural waste is determined by the shape and characteristics of the workpiece. The waste rate of the existing stamping processing is high. Summary of the Invention

[0003] In order to overcome the deficiencies of the prior art, the present invention provides a stamping die for improving the blanking utilization rate of link plates, which improves the material utilization rate and effectively solves the deformation problem of link plate parts during punching.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A stamping die for improving the blanking utilization rate of link plates, including a progressive die body. The progressive die body includes an upper die and a lower die. A traveling channel for the steel strip to pass through is formed between the upper die and the lower die. The traveling channel is sequentially provided with a punching station and a blanking station. The punching pins at the punching station and the punches at the blanking station are arranged in a staggered and inclined manner. The present invention adopts a staggered and inclined material arrangement method. Compared with the straight arrangement of 0.002874 pieces / mm 2 , the inclined arrangement is 0.003013128 pieces / mm 2 , thereby improving the blanking rate.

[0006] Furthermore, the hardness range of the steel strip is 94 - 98 HRB, thereby avoiding edge hole diameter collapse during blanking, reducing the blanking gap, and improving the bright zone of the hole diameter.

[0007] Further, the upper die from top to bottom successively includes an upper die base, a fixing plate spacer, a fixing plate, and an upper concave template and an upper stripper plate arranged side by side along the direction of the traveling channel; the lower die from top to bottom successively includes a lower stripper plate and a lower concave template, a lower template spacer, and a lower die base arranged side by side along the direction of the traveling channel; the upper concave template and the lower stripper plate are opposite to each other up and down, and a punching station is formed between the upper concave template and the lower stripper plate; the upper stripper plate and the lower concave template are opposite to each other up and down, and a blanking station is formed between the upper stripper plate and the lower concave template. In the present invention, the punching station is stressed from bottom to top, while the blanking station is stressed from top to bottom, so as to effectively solve the deformation problem of the chain link parts during punching.

[0008] Further, the punching pin at the punching station is made of tungsten steel material, the surface is polished to Ra < 0.4 microns, and its chamfer is a gradual entry structure, so as to improve the rigidity of the die, reduce the burrs at the edge of the bright band, the chamfer of the punching pin is appropriately larger, reduce the initial blanking impact, extend the bright band forming area, and improve the bright band of the hole diameter.

[0009] Further, a hole correction pin for matching the punching on the chain link is arranged in the first row of punch heads at the blanking station, which can avoid the shrinkage hole deformation problem of the punching when the chain link parts are blanked along the punching contour.

[0010] Further, a lifter is arranged below the first row of punch heads at the blanking station on the lower template spacer, and the flatness of the chain link parts is further ensured by the lifter.

[0011] Further, the lifter and the lower die base are connected by a nitrogen spring, utilizing the compression and expansion characteristics of the high-pressure nitrogen in the nitrogen spring. The core lies in the compressibility of nitrogen, and the elastic force is completed through the compression and expansion process of nitrogen. Specifically, when the high-pressure nitrogen is compressed, a large pressure will be generated, thereby completing the elastic force, and the magnitude of the elastic force can be accurately adjusted through the intensity of the pressure.

[0012] Further, the blanking station adopts the downward blanking method.

[0013] The beneficial effects of the present invention: improve the material utilization rate and effectively solve the deformation problem of the chain link parts during punching. Description of the Drawings

[0014] Figure 1 is the structural schematic diagram of the present invention.

[0015] Figure 2 is the side view schematic diagram of the present invention.

[0016] Figure 3 is the structural schematic diagram of the punching pin arrangement of the present invention.

[0017] Figure 4It is a schematic structural diagram of the staggered and oblique material discharging method of the present invention.

[0018] Figure 5 It is a schematic structural diagram provided at the blanking station of the present invention. Specific embodiments

[0019] The present invention will be further described below in conjunction with specific embodiments, but the present invention is not limited to these specific embodiments. Those skilled in the art should recognize that the present invention covers all alternative solutions, improvement solutions, and equivalent solutions that may be included within the scope of the claims.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more, unless otherwise clearly defined.

[0021] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0023] See Figures 1-5 , this embodiment provides a stamping die for improving the blanking utilization rate of chain plates, including a progressive die body. The progressive die body includes an upper die and a lower die. A traveling channel 15 through which a steel strip 14 passes is formed between the upper die and the lower die. The traveling channel 15 is sequentially provided with a punching station 16 and a blanking station 17. The punching pins at the punching station 16 and the punches at the blanking station 17 are arranged in a staggered and oblique manner. The present invention adopts a staggered and oblique blanking method. Compared with the straight arrangement of 0.002874 pieces / mm 2 , the oblique arrangement is 0.003013128 pieces / mm 2 , thereby improving the blanking rate.

[0024] The hardness range of the steel strip in this embodiment is 94 - 98 HRB, thereby avoiding the collapse of the edge hole diameter during blanking, reducing the blanking gap, and enhancing the bright zone of the hole diameter. The punching pins at the punching station 16 are made of tungsten steel material, with a surface polish of Ra < 0.4 microns, and its chamfer is a gradually entering structure, thereby enhancing the rigidity of the die, reducing the burrs at the edge of the bright zone. The chamfer of the punching pin is appropriately larger, reducing the initial blanking impact, extending the bright zone formation area, and enhancing the bright zone of the hole diameter.

[0025] The upper die in this embodiment sequentially includes an upper die base 1, a fixing plate backing plate 2, a fixing plate 3, and an upper concave template 4 and an upper stripper plate 5 arranged side by side along the direction of the traveling channel from top to bottom; the lower die sequentially includes a lower stripper plate 6 and a lower concave template 7, a lower template backing plate 8, and a lower die base 9 arranged side by side along the direction of the traveling channel from top to bottom; the upper concave template 4 and the lower stripper plate 6 are opposite to each other up and down, and a punching station 16 is formed between the upper concave template 4 and the lower stripper plate 6; the upper stripper plate 5 and the lower concave template 7 are opposite to each other up and down, and a blanking station 17 is formed between the upper stripper plate 5 and the lower concave template 7. The punching station 16 in the present invention is stressed from bottom to top, while the blanking station 17 is stressed from top to bottom, thereby effectively solving the deformation problem of the chain link parts during stamping.

[0026] In the first row of punch heads 10 at the blanking station 17 in this embodiment, there are hole correction pins 11 for punching on the chain link plate, which can avoid the shrinkage deformation problem of the holes when punching the outline of the link plate parts. A lifter 12 is arranged below the first row of punch heads 10 at the blanking station 17 on the lower template backing plate 8 to further ensure the flatness of the link plate parts through the lifter 12. The lifter 12 and the lower die base 9 are connected by a nitrogen spring 13, utilizing the compression and expansion characteristics of the high-pressure nitrogen in the nitrogen spring 13. The core lies in the compressibility of nitrogen, and the elastic force is completed through the compression and expansion process of nitrogen. Specifically, when the high-pressure nitrogen is compressed, a large pressure will be generated to complete the elastic force, and the magnitude of the elastic force can be accurately adjusted through the intensity of the pressure. The blanking station 17 adopts the downward blanking method.

[0027] In this embodiment, a pre-punching station and a fine-punching station can be set at the punching station 16, and a pre-blanking station, a downward blanking station, etc. are set at the blanking station 17.

[0028] In the present invention, by setting nitrogen springs, the bridge is reduced to 50% of the material thickness, the blanking clearance is reduced by increasing the bright zone in the hole, and the blanking rate is increased by adopting a staggered and oblique row blanking method.

Claims

1. A stamping die for improving the punching utilization rate of chain plates, comprising a progressive die body. The progressive die body includes an upper die and a lower die. A traveling channel for the steel strip to pass through is formed between the upper die and the lower die. The traveling channel is sequentially provided with a punching station and a blanking station, and is characterized in that: The punching pins at the punching station and the punch heads at the blanking station are arranged in a staggered and inclined manner.

2. The stamping die for improving the blanking utilization rate of the chain plate according to claim 1, wherein: The hardness range of the steel strip is 94 - 98 HRB.

3. A stamping die for improving the blanking utilization rate of chain plates according to claim 1, characterized in that: The upper die sequentially includes an upper die base, a fixing plate backing plate, a fixing plate, and an upper concave template and an upper stripper plate arranged side by side along the direction of the traveling channel from top to bottom; the lower die sequentially includes a lower stripper plate and a lower concave template, a lower template backing plate, and a lower die base arranged side by side along the direction of the traveling channel from top to bottom; the upper concave template and the lower stripper plate are opposite to each other up and down and form a punching station between the upper concave template and the lower stripper plate; the upper stripper plate and the lower concave template are opposite to each other up and down and form a blanking station between the upper stripper plate and the lower concave template.

4. A stamping die for improving the blanking utilization rate of chain plates according to claim 1, characterized in that: The punching pins at the punching station are made of tungsten steel material, with a surface polish Ra < 0.4 microns, and its chamfer is a gradually entering structure.

5. A stamping die for improving the blanking utilization rate of chain plates according to claim 1, characterized in that: Hole correction pins for punching on the chain link plate are provided in the first row of punch heads at the blanking station.

6. A stamping die for improving the punching utilization rate of chain plates according to claim 5, characterized in that: A lifter is provided below the first row of punch heads at the blanking station on the lower template backing plate.

7. A stamping die for improving the blanking utilization rate of chain plates according to claim 6, characterized in that: The lifter and the lower die base are connected by a nitrogen spring.

8. A stamping die for improving the blanking utilization rate of chain plates according to claim 1, characterized in that: The blanking station adopts the downward blanking method.

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