CN212664647U

CN212664647U - Fine blanking die capable of improving strength of male die and female die of thin-wall annular piece

Info

Publication number: CN212664647U
Application number: CN202020398937.XU
Authority: CN
Inventors: 肖振沿; 赵彦启; 吴伟辉; 李佳盈; 彭群
Original assignee: China Machinery Fine Blanking Technology Fujian Co ltd; Beijing Research Institute of Mechanical and Electrical Technology
Current assignee: China Machinery Fine Blanking Technology Fujian Co ltd; Beijing Research Institute of Mechanical and Electrical Technology
Priority date: 2020-03-25
Filing date: 2020-03-25
Publication date: 2021-03-09
Anticipated expiration: 2030-03-25

Abstract

The utility model discloses a fine blanking die capable of improving the strength of a punch-die of a thin-wall ring-shaped element, wherein a machined part is a circular ring-shaped element, an inner ring of the machined part is in a gear ring shape, two opposite positions of an outer ring of the machined part are respectively provided with two notches, and the thickness of a blank is t mm; the fine blanking die comprises a convex-concave die, a fixed plate, a gear ring pressing plate, a pressing rod, a material returning block, a concave die and a back pressing block; the outer walls of the male die and the female die corresponding to the two notches are provided with square frame-shaped rod sleeves; the upper end surface of the rod sleeve is flush with the upper end surface of the male and female dies, and the distance between the lower end surface of the rod sleeve and the lower end surface of the male and female dies is (t +3) mm; the bar sleeve is internally inserted with a cuboid rod-shaped pressing bar, the length of the pressing bar is equal to the height of the punch-die, the lower end face of the pressing bar is provided with V-shaped teeth, and the unilateral clearance between each face of the pressing bar and the corresponding inner wall face of the bar sleeve is 0.05 mm. The strength of the male die and the female die can be improved without changing the basic structure and the function of the traditional compound die.

Description

Fine blanking die capable of improving strength of male die and female die of thin-wall annular piece

Technical Field

The utility model belongs to the technical field of the essence is towards, a can improve essence towards mould of thin wall loop forming element punch-die intensity is related to.

Background

The fine blanking part can use a compound die or a progressive die. The compound die is used for simultaneously punching all shapes of the inner part and the outer part of a part in one station, is suitable for punching parts with high requirement on the position degree of the inner appearance, but the strength of a cutting edge element (mainly a male die and a female die) of the die is limited by the size and the shape of the punched part, and is very low under the condition of small wall thickness. The progressive die is used for punching the inner hole and the shape of a part step by step through two or more than two stations, the strength of a cutting edge element of the die is not influenced by the size and the shape of the punched part, but the position degree of the inner shape of a workpiece is poorer than that of a composite die due to the secondary positioning error existing between the steps.

A number of parts of ring gear washers are used extensively in automotive transmissions, as shown in figure 1. The parts have the characteristics of larger thickness, thinner local wall thickness and high requirements on the internal and external dimension precision and position precision, and need to adopt a compound die for fine punching processing.

The male die and the female die are key elements in the compound die and have the dual functions of the blanking male die and the punching female die. The height is generally over 75mm, the lower part is a punching end, and the upper part is a fixed end. The shape and size of the section of the punching end are consistent with the section of the part to be punched.

In order to ensure the relative position precision of the shapes in the convex-concave mould, the structures of the convex-concave mould are reasonably designed aiming at fine blanking pieces with different structural shapes and sizes, and a proper processing method is selected.

The shapes of the common fine blanking parts and the structures of the male die and the female die are shown in the following table:

shape of fine blanking part	Convex-concave die structure	Fixing mode	Processing method
				Xinling-like washer	Flange type hanging table	Internal and external grinding
Similar general electric parts		Flange type hanging table	Cylindrical grinding, slow-moving machining of special-shaped holes
				Similar shaft collar parts	Screw nail	One-step clamping and slow wire cutting
Similar hub mounting plate		Screw nail	Internal grinding and external slow-moving wire processing
				Similar to T5 flange	Steel balls or rivets	One-step clamping and slow wire cutting

When the wall thickness of a part to be punched is small, the wall thickness of the punch-die is small. According to the standard of JB/T9175.1-2013 'first part structure manufacturability of fine blanking parts', when the ratio of the wall thickness of a part to the thickness of a plate is less than 0.6, the part is difficult to finely punch, mainly because the male die and the female die are small in wall thickness, low in strength and easy to damage. The thickness of the plate material of the workpiece P shown in fig. 1 is 8mm, but the minimum wall thickness is only 4.0mm, and the ratio of the wall thickness to the plate material thickness is only 0.5, if the strength of the punch and the die is very weak according to the conventional design method described in the above table, the service life is difficult to guarantee.

For parts such as the machined part P shown in FIG. 1, the compound die in the prior art can be used, but the strength of the male die and the female die is very weak, the service life is difficult to guarantee, and the using effect is not ideal.

SUMMERY OF THE UTILITY MODEL

For overcoming the not enough of prior art, the utility model provides a can improve the fine blanking mould of thin wall loop forming element punch-die intensity can improve punch-die intensity and do not change the basic structure and the function of traditional compound die again.

The utility model discloses a reach the technical scheme that above-mentioned technical purpose adopted and be: a fine blanking die capable of improving the strength of a local thin-wall punch-die is characterized in that a workpiece is a circular ring-shaped piece, an inner ring of the workpiece is in a gear ring shape, two opposite positions of an outer ring of the workpiece are respectively provided with two notches, and the thickness of a blank is t mm; the fine blanking die comprises a convex-concave die, a fixed plate, a gear ring pressing plate, a pressing rod, a material returning block, a concave die and a back pressing block; the method is characterized in that: the outer walls of the male die and the female die corresponding to the two notches are provided with square frame-shaped rod sleeves; the upper end surface of the rod sleeve is flush with the upper end surface of the male and female dies, and the distance between the lower end surface of the rod sleeve and the lower end surface of the male and female dies is (t +3) mm; the bar sleeve is internally inserted with a cuboid rod-shaped pressing bar, the length of the pressing bar is equal to the height of the punch-die, the lower end face of the pressing bar is provided with V-shaped teeth, and the unilateral clearance between each face of the pressing bar and the corresponding inner wall face of the bar sleeve is 0.05 mm.

The utility model has the advantages that: because the cross section area of the male and female dies 1 is increased by utilizing the arrangement of the rod sleeve 8 aiming at two weak places influencing the strength of the male and female dies, not only the local strength is increased, but also the overall strength is correspondingly enhanced; the through hole of the rod sleeve 8 has two functions, namely, an installation space is reserved for the compression rod 4, and high-precision processing is convenient to carry out by using a slow-moving wire cutting method.

The pressing rod 4 plays a role in pressing edges of punched plate materials, and further achieves a fine punching effect. Because the part of the convex-concave die 1 with the enlarged sectional area occupies the position of the gear ring pressing plate 3, the gear ring pressing plate 3 can not press the punched plate material within the range, and the pressure lever 4 is used for making up the blank.

Therefore, the strength of the punch-die 1 is enhanced, the manufacturing precision can be effectively guaranteed, the fine blanking effect of the traditional compound die can still be maintained, and the using effect is more ideal.

Drawings

The present invention will be further explained with reference to the drawings and examples. Wherein:

fig. 1 is a schematic view of a fine blanking workpiece P according to the present invention;

fig. 2 is a schematic view of a cross-section of the present invention;

fig. 3 is a schematic view of another cross-section of the present invention;

fig. 4 is a schematic view of a punch and die part in the present invention;

fig. 5 is a schematic diagram of the male and female mold portions according to the present invention;

fig. 6 is a schematic view of a compression bar portion of the present invention.

The reference numbers in the drawings illustrate the following: the processing part P, the punch-die 1, the fixing plate 2, the gear ring pressing plate 3, the pressing rod 4, the material returning block 5, the die 6, the back pressing block 7, the rod sleeve 8 and the V-shaped teeth 9

Detailed Description

The embodiment of the utility model, as shown in fig. 1 to fig. 6, a fine blanking die capable of improving the strength of a local thin-wall punch-die, a workpiece P is a circular ring-shaped piece, the inner ring of the workpiece P is in a gear ring shape, two opposite positions of the outer ring of the workpiece P are respectively provided with two notches, and the thickness of a blank is t mm; the fine blanking die comprises a convex-concave die 1, a fixing plate 2, a gear ring pressing plate 3, a pressing rod 4, a material withdrawing block 5, a concave die 6 and a back pressure block 7; the method is characterized in that: the outer walls of the male and female dies 1 corresponding to the two notches are provided with square frame-shaped rod sleeves 8; the upper end surface of the rod sleeve 8 is flush with the upper end surface of the punch-die 1, and the distance between the lower end surface of the rod sleeve 8 and the lower end surface of the punch-die 1 is (t +3) mm; a rectangular rod-shaped pressure lever 4 is inserted in the lever sleeve 8, the length of the pressure lever 4 is equal to the height of the punch-die 1, V-shaped teeth 9 are arranged on the lower end face of the pressure lever 4, and the single-side gap between each face of the pressure lever 4 and the corresponding inner wall face of the lever sleeve 8 is 0.05 mm.

The utility model discloses a theory of operation: when the upper die moves downwards, the V-shaped teeth of the pressure lever 4 and the gear ring pressure plate 3 are pressed into the upper surface of the blank, and the V-shaped teeth on the female die 6 are pressed into the lower surface of the blank, so that the shearing area of the blank forms a three-dimensional pressure stress state. And the upper die continues to descend, the male die and the female die 1 gradually press the blank material below the male die and the female die 6, meanwhile, the press rod 4 and the gear ring press plate 3 move upwards relative to the male die and the female die 1, when the lower surface of the male die and the female die 1 moves to be parallel and level with the upper surface of the female die 6, the workpiece P is completely punched, and the blanking process is finished. After that, the upper die moves upwards, the counter-pressure plate 7 ejects the workpiece P out of the female die 6, and the compression bar 4, the gear ring pressing plate 3 and the stripper block 5 unload the waste from the male die 1, thereby completing a working cycle.

In the stamping process, the V-shaped teeth 9 of the pressure lever 4 are pressed into the blank all the time, so that the auxiliary gear ring pressure plate 3 can complete the blank pressing function, the defect of the material pressing function of the gear ring pressure plate 3 caused by the enhancement of the punch-die 1 is made up, and the fine stamping principle of the gear ring pressure plate 3 is maintained.

The present invention is not limited to the above-described embodiments. Various changes and modifications can be made without departing from the spirit and scope of the invention, and these are intended to be included within the scope of the invention.

Claims

1. A fine blanking die capable of improving the strength of a convex-concave die of a thin-wall annular part is characterized in that a workpiece is an annular part, an inner ring of the workpiece is in a gear ring shape, two opposite positions of an outer ring of the workpiece are respectively provided with two notches, and the thickness of a blank is t mm; the fine blanking die comprises a convex-concave die, a fixed plate, a gear ring pressing plate, a pressing rod, a material returning block, a concave die and a back pressing block; the method is characterized in that: the outer walls of the male die and the female die corresponding to the two notches are provided with square frame-shaped rod sleeves; the upper end surface of the rod sleeve is flush with the upper end surface of the male and female dies, and the distance between the lower end surface of the rod sleeve and the lower end surface of the male and female dies is (t +3) mm; the bar sleeve is internally inserted with a cuboid rod-shaped pressing bar, the length of the pressing bar is equal to the height of the punch-die, the lower end face of the pressing bar is provided with V-shaped teeth, and the unilateral clearance between each face of the pressing bar and the corresponding inner wall face of the bar sleeve is 0.05 mm.