CN110802192A

CN110802192A - Core rod for drawing cylinder and using method thereof

Info

Publication number: CN110802192A
Application number: CN201910967161.0A
Authority: CN
Inventors: 曹薇; 田新奇; 郭长虹; 薛永庆; 滕军航; 程攀
Original assignee: MCC SFRE Heavy Industry Equipment Co Ltd
Current assignee: MCC SFRE Heavy Industry Equipment Co Ltd
Priority date: 2019-10-12
Filing date: 2019-10-12
Publication date: 2020-02-18

Abstract

The invention discloses a mandrel for drawing a cylinder body, which comprises a first mandrel as a main body, wherein one end of the first mandrel is a large clamping section with a larger cross section size, the other end of the first mandrel is a small clamping section with a smaller cross section size, a conical surface B of a transition section is arranged between the large clamping section and the small clamping section, a convex shoulder A is arranged at the junction of the conical surface B and the large clamping section, and a step surface B is arranged at the junction of the conical surface B and the small clamping section. The invention also discloses a using method of the mandrel for drawing the cylinder body, which is implemented by using the mandrel for drawing the cylinder body. In the drawing process of the device, the length of the blank is gradually increased through the drawing process and is finally contacted with the tail flange to act, the length deformation is restricted, and the skirt phenomenon of the cylinder body is reduced; the appearance state of the forging is improved; and is favorable for saving materials to a certain extent.

Description

Core rod for drawing cylinder and using method thereof

Technical Field

The invention belongs to the technical field of free forging, relates to a mandrel for drawing out a cylinder, and further relates to a using method of the mandrel for drawing out the cylinder.

Background

In the free forging, the cylinder forging is formed by drawing a mandrel (tool) in a mode of drawing, one end of the cylinder forging is a free end when the mandrel is used for drawing, the free end is drawn for many times in the production process, an obvious skirt phenomenon can occur, if furnace temperature is uneven, the phenomenon is more prominent, and a serious person can cause the forging to be unqualified in size and generate waste products.

The method adopted in production generally is that when the products are blanked, the weight allowance of the blank is increased, and the skirt edge is sawed or machined and removed in the later period. This undoubtedly causes a great waste of materials, and increases the post-machining man-hour and the production cost.

Disclosure of Invention

The invention aims to provide a mandrel for drawing a cylinder, which solves the problems that in the prior art, when a blank is drawn, due to the unreasonable tool structure, the skirt edge of the cylinder is easy to appear, materials are wasted, the machining working hours in the later period are increased, and the production cost is obviously increased.

The invention also aims to provide a using method of the mandrel for drawing out the cylinder.

The technical scheme adopted by the invention is that the mandrel for drawing the cylinder body out comprises a first mandrel as a main body, wherein one end of the first mandrel is a large clamping section with a large section size, the other end of the first mandrel is a small clamping section with a small section size, a conical surface B of a transition section is arranged between the large clamping section and the small clamping section, a convex shoulder A is arranged at the junction of the conical surface B and the large clamping section, and a step surface B is arranged at the junction of the conical surface B and the small clamping section.

The invention adopts another technical scheme that the using method of the mandrel for drawing the cylinder body is implemented according to the following steps:

step 1, clamping a large clamping section of a first core rod by using a jaw of an operating machine, sleeving a fixed end flange on the first core rod, sleeving a blank on a conical surface B of the first core rod, and sleeving a tail flange, wherein the four parts form an integrated assembly together;

step 2, placing the assembled assembly on a material transferring table to turn around, clamping a small clamping section of the first core rod by using a jaw of an operating machine again, and simultaneously butting the jaw of the operating machine against the outer end face of the tail flange;

starting to perform blank drawing operation, and finally drawing the length of the cylinder body of the blank to L to obtain a finished product;

and 3, after the drawing operation is finished, turning the assembly part by using the material transferring platform again, clamping the large clamping section of the first core rod by using the jaw of the operating machine again, taking off the tail flange when the tail flange sleeved on the step surface B of the first core rod loses the fixed acting force of abutting joint, and taking out the finished product after the drawing along the conical surface B of the first core rod.

The invention has the advantages that the tail flange and the fixed end flange are adopted to limit the blank from drawing from two ends, so that the cylinder forging with two neat ends is obtained, the waste of the cylinder skirt to materials is reduced, the appearance quality of the forging is improved, and the production cost is reduced.

Drawings

FIG. 1 is a schematic view of the installation of a second mandrel in the process of drawing out a cylinder in the prior art;

FIG. 2 is a schematic structural view of a first core rod of the present invention;

FIG. 3 is a schematic view of a first mandrel and a mating flange of the present invention;

FIG. 4 is a schematic view of the mandrel of the present invention in an assembled state prior to drawing;

FIG. 5 is a schematic view of the mandrel of the present invention in an assembled state after drawing.

In the figure, 1, a first mandrel, 2, a fixed end flange, 3, a blank, 4, a tail flange, 5, a manipulator jaw and 6, a second mandrel.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1, a forged cylinder forging is drawn by using a mandrel in the industry at present, the mandrel second 6 shown in fig. 1 is adopted in the drawing working state, the mandrel second 6 comprises two sections, namely a clamping section a and a conical section a (a general mandrel blank is forged, the clamping section a is not basically a cylinder, the cross section of the clamping section a is more square, four sharp corners of the square are slightly circular arcs), a convex shoulder a is arranged at the junction of the clamping section a and the conical section a, and a fixed end flange 2 is arranged on the end face of the convex shoulder a facing the conical section a. The blank 3 is sleeved on the conical section A and is close to the fixed end flange 2, and therefore, in the drawing process, the free end of the core rod II 6 has no constraint force on the blank 3, so that a skirt phenomenon easily occurs in the drawing process, and the phenomenon causes material waste and causes large later-stage machining amount.

The invention has a structure that the structural improvement is directly carried out on the existing core rod II 6, namely, a step surface B is arranged (processed) on the corresponding position on the conical section A of the existing core rod II 6 according to the drawing size requirement, a tail flange 4 is sleeved on the step surface B, and a fixed end flange 2 is also arranged on the end surface of the convex shoulder A facing the conical section A.

Referring to fig. 2 and 3, the invention further provides a brand new structure, which comprises a first mandrel 1 as a main body, wherein one end of the first mandrel 1 is a large clamping section (a large head end) with a large cross section, the other end of the first mandrel 1 is a small clamping section (a small head end) with a small cross section, a conical surface B of a transition section is arranged between the large clamping section and the small clamping section (compared with two sections of a second mandrel 6, the first mandrel 1 comprises three sections), a convex shoulder a is arranged at the junction of the conical surface B and the large clamping section, and a step surface B is arranged at the junction of the conical surface B and the small clamping section; a fixed end flange 2 is sleeved on the end face of the convex shoulder A facing the conical surface B, and a tail flange 4 is sleeved on the step surface B;

during the drawing operation, the blank 3 is sleeved on the conical surface B of the transition section.

The shape and the size of the large clamping section and the small clamping section can be matched with the operation machine jaw 5, and the operation machine jaw 5 can clamp and fix the mandril I1 in a matching mode.

Based on the new mandrel structure provided by the invention, the newly designed mandrel I1 is used for drawing, a certain constraint force is provided for the free deformation end (small end) of the mandrel I1, the condition that the blank 3 has a barrel skirt edge is reduced, the drawing process is shown in the figure 4 and the figure 5, and the effects of reducing the production cost to the maximum extent and reducing the machining period are achieved.

The use method for drawing the blank 3 by using the first core rod 1 is implemented according to the following steps:

step 1, clamping a large clamping section (which is used as a first fixed end) of a first core rod 1 by a jaw 5 of an operating machine, sleeving a fixed end flange 2 on the first core rod 1, sleeving a blank 3 on a conical surface B of the first core rod 1, and sleeving a tail flange 4, wherein the four parts form an integrated assembly together;

step 2, placing the assembled assembly on a material transferring table to turn around, clamping a small clamping section (which is used as a second fixed end) of the first mandrel 1 by using the manipulator jaw 5 again, and simultaneously butting the manipulator jaw 5 against the outer end surface of the tail flange 4, wherein the working state is shown in fig. 4;

the blank 3 is drawn out, the barrel length of the blank 3 is drawn out to L finally, and a finished product can be obtained, the working state is shown in figure 5, the front end of the blank 3 is restricted by the tail flange 4, the length of the blank 3 is increased continuously through drawing, the blank is finally fastened with the tail flange 4, and the tail flange 4 restricts the free extension of the blank 3.

(in this step, after the mandrel I1, the blank 3 and the tail flange 4 are assembled, the operation machine jaw 5 turns around, which is equal to that the fixed end of the operation machine jaw 5 is loosened, because the square platform of the fixed end is larger than the space between the conical surfaces, the blank still has acting force, and the operation machine jaw 5 clamps the small step at the outer end of the step surface B of the tail flange 4 after turning around, and limits the small step)

And 3, after the drawing operation is finished, turning the assembly by using the material transferring table again, clamping the large clamping section (which is used as a third fixed end) of the first mandrel 1 by using the operating machine jaw 5 again, taking the tail flange 4 out of the abutting fixed acting force of the tail flange 4 sleeved on the step surface B of the first mandrel 1, taking the tail flange 4 off at first, and taking out the drawn finished product (the drawn finished product of the blank 3) along the conical surface B of the first mandrel 1 to obtain the finished product.

In all the steps, the jaw 5 of the manipulator is used for clamping all the time, the mandrel I1 turns around left and right as required, the position of the jaw 5 of the manipulator is unchanged, and only one end of the mandrel I1 can be clamped in each step.

The method for drawing the billet 3 by using the improved second mandrel 6 is the same as the method for drawing the billet 3 by using the first mandrel 1.

Claims

1. The utility model provides a barrel is drawn forth and is used plug which characterized in that: the clamping device comprises a first core rod (1) serving as a main body, wherein one end of the first core rod (1) is a large clamping section with a large cross section size, the other end of the first core rod (1) is a small clamping section with a small cross section size, a conical surface B of a transition section is arranged between the large clamping section and the small clamping section, a convex shoulder A is arranged at the junction of the conical surface B and the large clamping section, and a step surface B is arranged at the junction of the conical surface B and the small clamping section.

2. The mandrel for barrel elongation according to claim 1, wherein: the end surface of the convex shoulder A facing the conical surface B is sleeved with a fixed end flange (2).

3. The mandrel for barrel elongation according to claim 1, wherein: the step surface B is sleeved with a tail flange (4).

4. The mandrel for barrel elongation according to claim 1, wherein: the shape and the size of the large clamping section are matched with those of a jaw (5) of the manipulator.

5. The mandrel for barrel elongation according to claim 1, wherein: the shape and the size of the small clamping section are matched with the jaw (5) of the manipulator.

6. A method of using the mandrel for drawing a cylindrical body according to claims 1 to 5, comprising the steps of:

step 1, clamping a large clamping section of a first core rod (1) by a jaw (5) of an operating machine, sleeving a fixed end flange (2) on the first core rod (1), sleeving a blank (3) on a conical surface B of the first core rod (1), and sleeving a tail flange (4), wherein the four parts form an integrated assembly together;

step 2, placing the assembled assembly on a material transferring table to turn around, clamping the small clamping section of the first core rod (1) by using an operation machine jaw (5), and simultaneously propping the operation machine jaw (5) on the outer end surface of the tail flange (4);

drawing out the blank (3), and finally drawing out the barrel length of the blank (3) to L to obtain a finished product;

and 3, after the drawing operation is finished, turning the assembly by using the material transferring platform again, clamping the large clamping section of the first core rod (1) by using the operation machine jaw (5) again, removing the tail flange (4) when the tail flange (4) sleeved on the step surface B of the first core rod (1) loses the fixed acting force of abutting joint, and then taking out the drawn finished product along the conical surface B of the first core rod (1) to obtain the finished product.