阅读说明：本技术 一种深筒件拉深模具和高速拉深工艺 (deep barrel drawing die and high-speed drawing process ) 是由 宋孟 李妍妍 白凤梅 黄贞益 刘相华 于 2019-10-28 设计创作，主要内容包括：本发明公开了一种深筒件拉深模具和高速拉深工艺,属于塑性材料加工领域。该模具包括互相配合的凸模和凹模,所述凸模包括圆柱凸台,所述凹模具有上端开口的拉深槽,所述拉深槽内从上到下依次设置有圆台段、定径段和圆筒段,所述定径段的直径基本等于每一步拉深减薄后的工件直径；所述圆筒段的直径大于定径段的直径0.5mm～2mm。该工艺通过设置合理的拉深工艺参数和配合上述模具,能够在保证成品深筒件不产生较大质量缺陷的情况下,以较高的深冲速度进行拉深,有效地提高了深筒件的生产效率。(The invention discloses a drawing die and a high-speed drawing process for deep cylinder parts, which belong to the field of plastic material processing, the die comprises a male die and a female die which are matched with each other, the male die comprises a cylindrical boss, the female die is provided with a drawing groove with an opening at the upper end, a circular table section, a sizing section and a cylinder section are sequentially arranged in the drawing groove from top to bottom, the diameter of the sizing section is basically equal to the diameter of a workpiece after drawing and thinning every steps, and the diameter of the cylinder section is 0.5-2 mm larger than that of the sizing section.)

The deep-drawing die for the deep-drawing barrel parts comprises a male die (1) and a female die (2) which are matched with each other, wherein the male die (1) comprises a cylindrical boss, and the deep-drawing die is characterized in that the female die (2) is provided with a deep-drawing groove (21) with an opening at the upper end, a circular table section (22), a sizing section (23) and a cylinder section (24) are sequentially arranged in the deep-drawing groove (21) from top to bottom, the diameter of the sizing section (23) is basically equal to the diameter of a workpiece after each steps of deep-drawing and thinning, and the diameter of the cylinder section (24) is 0.5-2 mm larger than that of the sizing section (23).

2. The deep-drawing dies of claim 1, wherein the height of the sizing section (23) is 5 mm-15 mm.

3. The deep tube drawing dies of claim 2, wherein the height of the circular platform section (22) is 8 mm-13 mm, and the included angle between the side face and the vertical direction is 13-20 °.

4. The deep-drawing dies of claim 3, characterized in that the junction of the sizing section (23) and the cylinder section (24) is a circular arc transition with a circular arc radius of 0.5 mm-2 mm.

5, high-speed deep drawing processes of deep tube, adopting deep tube drawing dies of claims 1-4 to draw, characterized in that the friction coefficient of the drawing material and the punch (1) is 0.05-0.09, the friction coefficient of the drawing material and the die (2) is 0.1-0.11, and the deep drawing speed is 220-300 mm/s.

6. The deep barrel part high speed drawing process of claim 5, comprising the steps of:

, preliminary forming, namely preparing a blank, and drawing the blank by adopting a conventional drawing die to form a hollow cylindrical part with an opening at the upper end;

and step two, ironing forming, namely, drawing the cylindrical part drawn in the step by using an deep cylindrical part drawing die in claim 5 to form a finished deep cylindrical part with set size.

7. The high-speed deep drawing process of claim 6, wherein the conventional die comprises an upper die and a lower die which are matched with each other, the upper die has a cylindrical table, and the lower die has a cylindrical groove matched with the cylindrical table.

8. The kind of high-speed deep drawing process for deep tube material according to claim 7, wherein in step , the friction coefficient between the blank and the upper die is 0.05-0.09, and the friction coefficient between the blank and the lower die is 0.1-0.11.

9. The deep drawing process of claim wherein the lubricant is added to the drawing material and the die prior to drawing, the temperature of the lubricant being 10-15 ℃.

Technical Field

The invention belongs to the technical field of plastic material processing, and particularly relates to deep barrel drawing dies and a high-speed drawing process.

Background

The deep drawing process of the deep barrel part generally improves the deep drawing efficiency by improving the deep drawing speed, but in the forming process of the thin-wall deep barrel part, due to the fact that the deep drawing height is large, the wall thickness is thin, deformation of the thin wall is severe, and the thin wall is affected by residual stress, the defects of wire drawing, scratching, tensile cracking, even tensile breaking and the like often occur in the high-speed deep drawing process.

For example, CN201510633335.1, published as 2015, 12/16/discloses deep cylindrical part deep drawing forming methods and dies, wherein the dies comprise a female die, a male die corresponding to the female die and a blank holder sleeved on the male die, and corresponding and matched deep drawing threshold structures are arranged on the bottom surface of the female die and the surface of the blank holder corresponding to the bottom surface, when is used for drawing, the product does not form a flange, so that the wrinkling of the mouth part of a workpiece can be effectively prevented when the workpiece is drawn in a second pass.

For example, CN201410062540.2, published as 5.21.2014, discloses a non-ironing drawing process for small-flange cylindrical parts, which comprises the steps of softening, washing and lubricating a blank, putting the treated blank into a drawing die for four times of drawing, trimming and shaping, wherein the blank is drawn into a final product by four times of drawing, and series of preliminary treatments are performed before drawing, such as softening, cleaning and lubricating, so that the drawing times are reduced, the efficiency is improved, and the softening and lubricating treatment for the material is also performed in the drawing process, so that the drawing efficiency can be improved by steps.

Disclosure of Invention

1. Problems to be solved

The invention provides high-speed deep-drawing processes for deep-drawing tubes, aiming at the problem that the quality defect of the finished deep-drawing tube is easy to generate by adopting higher deep-drawing speed when the deep-drawing tube is drawn by the existing deep-drawing process.

The invention also provides deep tube drawing dies, which can realize high-speed drawing of the deep tube and improve the production efficiency by matching with the drawing process.

2. Technical scheme

In order to solve the above problems, the present invention adopts the following technical solutions.

deep-drawing dies for deep-tube parts comprise a male die and a female die which are matched with each other, wherein the male die comprises a cylindrical boss, the female die is provided with a drawing groove with an opening at the upper end, a circular table section, a sizing section and a cylinder section are sequentially arranged in the drawing groove from top to bottom, the diameter of the sizing section is basically equal to the diameter of a workpiece after drawing and thinning every steps, and the diameter of the cylinder section is 0.5-2 mm larger than that of the sizing section.

As a further improvement of steps of the technical scheme, the height of the sizing section is 5 mm-15 mm.

According to the improvement of , the height of the circular platform section is 8-13 mm, and the included angle between the side surface and the vertical direction is 13-20 degrees.

As a further improvement of , the joint of the sizing section and the cylinder section is in arc transition, and the radius of the arc is 0.5-2 mm.

And high-speed deep drawing processes of the deep barrel parts adopt the deep barrel part drawing dies to perform drawing work, wherein the friction coefficient of a drawing material and a convex die is 0.05-0.09, the friction coefficient of the drawing material and a concave die is 0.1-0.11, and the deep drawing speed is 220-300 mm/s.

As a further improvement of the technical scheme , the method comprises the following steps:

, preliminary forming, namely preparing a blank, and drawing the blank by adopting a conventional drawing die to form a hollow cylindrical part with an opening at the upper end;

and step two, ironing forming, namely, drawing the cylindrical part drawn in the step by using an deep cylindrical part drawing die in claim 5 to form a finished deep cylindrical part with set size.

As a further improvement in , the conventional mold comprises an upper mold and a lower mold which are matched with each other, wherein the upper mold is provided with a cylindrical table, and the lower mold is provided with a cylindrical groove matched with the cylindrical table.

In a further improvement , in step , the friction coefficient between the blank and the upper die is 0.05-0.09, and the friction coefficient between the blank and the lower die is 0.1-0.11.

improvement, before drawing, adding lubricant into drawing material and mold, the temperature of lubricant is 10-15 deg.C.

3. Advantageous effects

Compared with the prior art, the invention has the beneficial effects that:

(1) the invention deep barrel drawing dies, it confirms the work piece thickness drawn through the diameter difference of the gauge section and boss, confirm the drawing height through the sum of height of gauge section and cylinder section, and it is more violent to the metal flow when the deep barrel is drawn, the condition that the high-speed drawing is apt to appear the quality defect, set up round platform section and cylinder section with flaring structure that the diameter is greater than the gauge section, can make the metal flow while drawing smoother, reduce the possibility to appear the quality defect, and the surplus space of cylinder section can hold the lubricating fluid entering into the die, debris, etc., prevent debris from occupying definite space and causing the definite influence of to the wall thickness dimensional accuracy of the drawing work piece, namely can increase the deep-drawing speed while drawing properly after adopting the die to draw, raise production efficiency;

(2) according to the deep-drawing die for the deep barrel part, the connecting part of the sizing section and the barrel section adopts circular arc transition, so that when a workpiece is drawn, metal flows smoothly, the metal structure and the wall thickness of the formed deep barrel part are , and the overall performance of the deep barrel part is uniform;

(3) according to the high-speed deep drawing process for the deep barrel part, the reasonable friction coefficient is designed, and the corresponding drawing die is matched, so that the possibility of quality defects of a drawing material in high-speed drawing can be effectively reduced, the deep barrel part is drawn at a high deep drawing speed, the drawing speed is increased, and the production efficiency is improved;

(4) according to the high-speed deep drawing process for the deep cylinder part, the lubricating liquid is added into the drawing material and the die, so that the friction coefficient between the drawing material and the die can be well controlled, and the redundant lubricating liquid flows into the redundant space of the cylinder section, so that quality defects such as wire drawing, tension cracking and the like cannot be generated when the workpiece is drawn at a high deep drawing speed.

Drawings

FIG. 1 is a schematic drawing of the drawing process of the present invention;

FIG. 2 is a schematic structural diagram of a female die of the deep-drawing die for a barrel part according to the present invention;

in the figure: 1. a male die; 2. a female die; 21. drawing the groove deeply; 22. a circular table section; 23. a sizing section; 24. a cylinder section.

Detailed Description

The invention is further described in with reference to specific embodiments and accompanying drawings.