A continuous stamping method for manufacturing thin-walled conical cylindrical parts

Abstract

The present application belongs to the technical field of stamping processing, and relates to a continuous stamping method for manufacturing a thin-walled conical cylinder part. The steps include: drawing and expanding, drawing and raising, forming a conical surface, and trimming. The drawing and expanding step punches a first convexity with a bottom surface and a cylindrical side wall in the middle of a sheet; the drawing and raising step draws and thins the first convexity into a second convexity; the forming a conical surface step processes the side wall into a conical wall and processes the R angle of the edge of the conical wall to the design value of the conical cylinder part, thereby obtaining a conical cylinder part connected to the peripheral material on all sides. The method enlarges the deformation area and the R angle of the material to enlarge the thinning area, and then gradually deforms the convexity area and the R angle to a small size, thereby avoiding the material breakage caused by the thinning of the material concentrated at the turning position of the material and ensuring the product quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of stamping processing, in particular to a continuous stamping method for manufacturing thin-walled conical cylinder parts. BACKGROUND

[0002] In the metal processing industry, many thin-walled materials need to be stamped with metal sheets. Deep drawing parts are often gradually stamped into product structures from small to large. However, this processing method is generally suitable for materials with good fluidity. If the material has poor fluidity, it is more likely to break.

[0003] Because deep drawing often needs to stretch the material by tens of times in height, the higher the stretching, the thinner the thickness of the deformation area. Because the material has poor fluidity, the stretching deformation area will be more concentrated on the transition surface between the high and low surfaces, so that after stretching, the material on the transition surface will become extremely thin and then break.

[0004] Therefore, it is necessary to design a new forming method to facilitate the forming of low ductility materials. SUMMARY

[0005] The main purpose of the present application is to provide a continuous stamping method for manufacturing thin-walled conical cylinder parts, which can use materials with poor fluidity to form thin-walled conical parts and avoid breaking problems.

[0006] The present application realizes the above-mentioned purpose through the following technical scheme: a continuous stamping method for manufacturing thin-walled conical cylinder parts, the steps comprising:

[0007] S1, stretching and expanding: compressing the peripheral material of the sheet, and punching a first convexity with a bottom surface and a cylindrical side wall in the middle of the sheet, the design range of the first convexity is 40-60% larger than the design range of the conical cylinder part, the convex height of the first convexity is 60-70% of the design height of the conical cylinder part, the bottom surface and the side wall are transitioned with an R angle with a radius R1, the side wall and the peripheral material are transitioned with an R angle with a radius R2, R1 and R2 are 6-10 times the original thickness of the sheet;

[0008] S2, stretching high: compressing the peripheral material of the sheet, and stretching the first convexity to a second convexity, the inner diameter of the side wall of the second convexity is 90-95% of the inner diameter of the side wall of the first convexity, the convex height of the second convexity is 90-95% of the design height of the conical cylinder part, the side wall of the second convexity and the bottom surface are transitioned with an R angle with a radius r1, the side wall of the second convexity and the peripheral material are transitioned with an R angle with a radius r2, r1 and r2 are 4-5 times the original thickness of the sheet;

[0009] S3, chamfering: compressing the peripheral material of the sheet, processing the sidewall into a tapered wall, and processing the R angle of the tapered wall edge to the design value of the tapered cylinder, obtaining a tapered cylinder connected to the peripheral material;

[0010] S4, edge cutting: compressing the peripheral material of the sheet, cutting the tapered cylinder from the peripheral material;

[0011] The sheet is a continuous strip, and before the drawing and expanding step, there is a positioning hole punching step, which cuts at least two positioning holes in the range of the peripheral material with the first end and both sides of the strip as the positioning, and the subsequent steps take the positioning holes as the positioning reference;

[0012] There is also a process hole punching step between the drawing and expanding step and the positioning hole punching step, which cuts a plurality of process holes on the strip to connect the peripheral material and the intermediate part with a plurality of connecting materials, and there is a gap of more than 1mm between the profile of the intermediate part and the range of the first convex hull.

[0013] Specifically, there is also a through hole punching step between the chamfering step and the edge cutting step, which compresses the tapered wall of the tapered cylinder and punches a through hole on the bottom surface of the tapered cylinder.

[0014] The beneficial effects of the technical scheme of the present application are:

[0015] The method enlarges the thinning area by increasing the deformation area and increasing the R angle of the material, and then gradually deforms the convex hull area and the R angle to small, avoiding the material thinning concentrated in the material turning position and causing the material to break, and ensuring the product quality. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the change sequence diagram of the deformation position of the sheet of Example 1;

[0017] Figure 2 It is a partial structure diagram of the strip of Example 2 when the drawing and expanding are completed;

[0018] Figure 3 It is a change sequence diagram of the deformation position of the strip of Example 2.

[0019] The marks in the figure are:

[0020] 1a-first convex hull, 1b-second convex hull, 1c-tapered cylinder, 11a-sidewall, 11b-tapered wall, 12-bottom surface, 121-through hole;

[0021] 21-peripheral material, 22-positioning hole, 23-process hole, 24-connecting material. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below with reference to specific embodiments.

[0023] Example 1:

[0024] like Figure 1 As shown, a continuous stamping method for manufacturing thin-walled conical cylinder parts includes the following steps:

[0025] S1. Expansion: The outer material 21 of the compressed sheet is pressed, and a primary convex 1a with a bottom surface 12 and a cylindrical sidewall 11a is punched in the middle of the sheet. The design range of the primary convex 1a is 40-60% larger than the design range of the conical cylindrical part 1c. The convex height of the primary convex 1a is 60-70% of the design height of the conical cylindrical part 1c. The bottom surface 12 and the sidewall 11a transition with an R angle of radius R1, and the sidewall 11a transitions with the outer material with an R angle of radius R2. R1 and R2 are 6-10 times the original thickness of the sheet.

[0026] This step is to create a primary convex 1a with an expanded stamping range, reduced stamping height, and enlarged radius. Because the material in the deformed part does not have a large corner during stamping, it is stretched more evenly when impacted by the punch, thus resulting in a product with a thinner wall thickness that will not break during subsequent processing.

[0027] S2, Pulling Up: Press the outer material 21 of the sheet to pull up and thin the primary convex 1a into a secondary convex 1b. The inner diameter of the side wall of the secondary convex 1b is 90-95% of the inner diameter of the side wall of the primary convex 1a. The convex height of the secondary convex 1b is 90-95% of the design height of the conical cylinder 1c. The side wall 12a of the secondary convex 1b transitions to the bottom surface 11 with an R angle of radius r1. The side wall 11a of the secondary convex 1b transitions to the outer material 21 with an R angle of radius r2. r1 and r2 are 4-5 times the original thickness of the sheet.

[0028] This step primarily aims to gradually bring the structure of the secondary convex hull 1c closer to the structure of the conical cylinder 1c in terms of range, height, and radius (R-angle). The sidewall 11a will also correspondingly become taller and smaller. Because the material has already reached a uniformly thinned intermediate state during the stretching process, increasing the height does not significantly increase the deformation area, but it does reduce the risk of breakage while bringing the structure closer to the final structure.

[0029] S3. Conical surface: Press the outer material 21 of the sheet, process the side wall 11a into a conical wall 11b, and process the R angle of the edge of the conical wall 11b to the design value of the conical cylinder 1c, so as to obtain the conical cylinder 1c connected to the outer material 21 on all four sides.

[0030] Since the transition area between the high and low surfaces in the product structure should be a conical structure, this step mainly involves shaping the sidewall 11a to form a conical structure that is thicker at the top and thinner at the bottom.

[0031] S4, trimming: the peripheral material 21 of the sheet is compressed, and the tapered cylinder 1c is cut from the peripheral material 21.

[0032] The method enlarges the thinning area by increasing the deformation area and the R angle of the material, and then gradually deforms the convex area and the R angle to small, avoiding the material thinning concentrated in the material turning position and causing the material to break, and ensuring the product quality.

[0033] Example 2:

[0034] As shown in Figure 2 and Figure 3 A continuous stamping method for manufacturing a thin-walled tapered cylinder, the steps include:

[0035] S1, punch positioning hole: select a continuous material strip as a sheet, and cut at least two positioning holes 22 in the range of the peripheral material 21 with the first end and both sides of the material strip as positioning.

[0036] S2, punch process hole: cut a plurality of process holes 23 on the material strip to connect the peripheral material 21 and the intermediate part with a plurality of connecting materials 24, and there is a gap of more than 1mm between the profile of the intermediate part and the range of the first convex 1a.

[0037] S3, stretch and expand: take the positioning hole 22 as the positioning reference, compress the peripheral material 21 of the sheet, and punch out a first convex 1a with a bottom surface 12 and a cylindrical side wall 11a in the middle of the sheet, the design range of the first convex 1a is expanded by 40-60% than the design range of the tapered cylinder 1c, the protruding height of the first convex 1a is 60-70% of the design height of the tapered cylinder 1c, the bottom surface 12 and the side wall 11a are transitioned with an R angle of R1, the side wall 11a and the peripheral material are transitioned with an R angle of R2, R1 and R2 are 6-10 times the original thickness of the sheet.

[0038] Stretching: taking the positioning hole 22 as the positioning reference, compressing the peripheral material 21 of the sheet, and stretching the first convex 1a to a second convex 1b, the inner diameter of the side wall of the second convex 1b is 90-95% of the inner diameter of the side wall of the first convex 1a, the protruding height of the second convex 1b is 90-95% of the design height of the tapered cylinder 1c, the side wall 12a of the second convex 1b and the bottom surface 11 are transitioned with an R angle of r1, and the side wall 11a of the second convex 1b and the peripheral material 21 are transitioned with an R angle of r2, r1 and r2 are 4-5 times the original thickness of the sheet.

[0039] S3, punch the taper: with the positioning hole 22 as the positioning reference, press the peripheral material 21 of the sheet material, process the side wall 11a into a tapered wall 11b, and process the R angle of the edge of the tapered wall 11b to the design value of the taper cylinder piece 1c, to obtain the taper cylinder piece 1c connected to the peripheral material 21 on all sides.

[0040] S4, punch the through hole: with the positioning hole 22 as the positioning reference, press the tapered wall 11b of the taper cylinder piece 1c, and punch the through hole 121 on the bottom surface of the taper cylinder piece 1c.

[0041] S5, edge cutting: with the positioning hole 22 as the positioning reference, press the peripheral material 21 of the sheet material, and cut the taper cylinder piece 1c from the peripheral material 21.

[0042] The difference from example 1 is that the stamping method is completed on the material belt. In the case of a small taper cylinder piece 1c structure, it is time-consuming and laborious to manually position the product in the stamping die, so the positioning is performed by relying on the material belt and using the positioning hole 22, and then the step-by-step is completed in the continuous die, which not only meets the basic requirement of avoiding breakage, but also improves the working efficiency of the entire stamping process. In addition, in the case of a through hole 121 structure on the bottom surface 12 of the taper cylinder piece 1c, it can also be completed before blanking.

[0043] The above only describes some embodiments of the present application. For those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which are all within the protection scope of the present application.

Claims

1. A continuous stamping method of manufacturing a thin-walled conical piece, characterized by the steps of The method comprises the following steps: S1, expanding: compressing the peripheral material of the sheet, and punching a first convex bump with a bottom surface and a cylindrical side wall in the middle of the sheet, the design range of the first convex bump is expanded by 40-60% than the design range of the cone cylinder, the protrusion height of the first convex bump is 60-70% of the design height of the cone cylinder, the bottom surface and the side wall are connected by an R angle with a radius of R1, and the side wall and the peripheral material are connected by an R angle with a radius of R2, R1 and R2 are 6-10 times of the original thickness of the sheet; S2, raising: compressing the peripheral material of the sheet, and raising and thinning the first convex bump to a second convex bump, the inner diameter of the side wall of the second convex bump is 90-95% of the inner diameter of the side wall of the first convex bump, the protrusion height of the second convex bump is 90-95% of the design height of the cone cylinder, the side wall of the second convex bump and the bottom surface are connected by an R angle with a radius of r1, and the side wall of the second convex bump and the peripheral material are connected by an R angle with a radius of r2, r1 and r2 are 4-5 times of the original thickness of the sheet; S3, punching a tapered surface: compressing the peripheral material of the sheet, processing the side wall into a tapered wall, and processing the R angle of the edge of the tapered wall to the design value of the cone cylinder, to obtain a cone cylinder connected to the peripheral material on all sides; S4, edge cutting: compressing the peripheral material of the sheet, and cutting the cone cylinder from the peripheral material; The sheet is a continuous material belt, and the expanding step is followed by a positioning hole punching step, the positioning hole punching step cuts at least two positioning holes in the range of the peripheral material with the first end and both sides of the material belt as the positioning, and the subsequent steps use the positioning holes as the positioning reference; The expanding step and the positioning hole punching step are followed by a process hole punching step, the positioning hole punching step cuts a plurality of process holes on the material belt to connect the peripheral material and the intermediate part by a plurality of connecting materials, and there is a gap of more than 1mm between the profile of the intermediate part and the range of the first convex bump.

2. The continuous stamping method of manufacturing a thin-walled conical member according to claim 1, characterized by: The tapered surface punching step and the edge cutting step are followed by a through hole punching step, the through hole punching step compresses the tapered wall of the cone cylinder, and punches a through hole in the bottom surface of the cone cylinder.

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