CN113399529A

CN113399529A - Composite forming method for paired wheel spinning and double-roller clamping spinning of thin-wall rotary part

Info

Publication number: CN113399529A
Application number: CN202110756976.1A
Authority: CN
Inventors: 范淑琴; 徐洪忠; 赵升吨; 张昊天; 李国武; 孙晓佳
Original assignee: Xian Jiaotong University
Current assignee: Xian Jiaotong University
Priority date: 2021-07-05
Filing date: 2021-07-05
Publication date: 2021-09-17

Abstract

A composite forming method of thin-wall revolving body parts through paired wheel spinning and double-roller clamping spinning comprises the steps of firstly performing paired wheel spinning on thick-wall seamless pipe blanks to obtain seamless thin-wall cylindrical part blanks, and then forming complex molded surface parts through double-roller clamping spinning; when the paired wheels are spun, the deformation of the workpiece is symmetrical, the stress state is improved, the dimensional precision is improved, longitudinal welding seams can be eliminated, parts with different specifications do not need to be replaced by core moulds, and the equipment cost is low; the forming has the advantages of small forming load, high size precision, high surface quality, high material utilization rate and high processing efficiency.

Description

Composite forming method for paired wheel spinning and double-roller clamping spinning of thin-wall rotary part

Technical Field

The invention relates to the technical field of plastic forming of thin-wall revolving body parts, in particular to a composite forming method of wheel spinning and double-roller clamping spinning of thin-wall revolving body parts.

Background

In the industrial production process, the thin-wall revolving body part with the complex molded surface is widely applied to various fields, such as a wind gathering cover for a wind gathering type wind driven generator, a fan shell of ventilation equipment, a wind collector, a wind barrel and the like. A double-roller clamping spinning forming process is very suitable for forming complex-profile thin-wall revolving body parts, belongs to the field of common spinning, and therefore has the advantages of small forming force of common spinning, low equipment cost, high part mechanical strength and good surface quality. The pair of cylindrical rotary rollers is adopted to symmetrically clamp the plate, the plate is spun under the action of compressive stress, the plate is thick enough to bear large pressure and is not easy to wrinkle, and the dimensional precision of a double-roller clamping spinning forming piece is further improved compared with the common spinning. When the plate is formed, the plate is in line contact with the rotary roller, the load action area is large, the deformation degree of each pass is large, and the spinning production efficiency is high. The shape of the workpiece clamped by the double rollers and formed by spinning is irrelevant to the outline of the core die, is determined by the motion track of the spinning rollers, and belongs to the non-die flexible spinning forming. The defects of complex working procedures, low part precision, poor surface quality and low material utilization rate existing in the traditional processing modes of stamping, splitting, welding, polishing and the like can be overcome.

However, the forming method usually adopts a roll welding mode in the process of preparing the drum blank, longitudinal welding seams are left after roll welding processing, appearance quality is affected, and cracks may be generated at the welding seams in the later spinning process, so that qualified parts cannot be formed. The Chinese invention patent (application number: CN201811027297.5) discloses a composite forming method of flow spinning and double-roller clamping spinning processing, which solves the problem of welding seams in the blank rolling and welding process when a thin-wall revolving body part is processed by double-roller clamping spinning, but a core die is needed in the flow spinning processing process, and different core dies need to be replaced when blanks with different sizes are processed, so that the process is complicated, and the core die cost is higher. Therefore, a novel manufacturing process of a thin-wall revolving body part with a complex profile is urgently needed.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a composite forming method of the pair-roller spinning and the double-roller clamping spinning of the thin-wall rotary part, which has the advantages that a core mold does not need to be replaced during the pair-roller spinning, and the equipment cost is low; the method has the advantages of small forming load, high size precision, high surface quality, high material utilization rate and high processing efficiency.

In order to achieve the purpose, the invention adopts the technical scheme that:

a composite forming method of thin-wall revolving body parts through paired wheel spinning and double-roller clamping spinning comprises the steps of firstly performing paired wheel spinning on thick-wall seamless pipe blanks to obtain seamless thin-wall cylindrical part blanks, and then forming complex molded surface parts through double-roller clamping spinning; the method specifically comprises the following steps:

firstly, clamping a thick-wall seamless pipe blank 3 on a first internal expanding type clamp 2 of a spinning machine, and clamping the thick-wall seamless pipe blank 3 by using internal and external spinning wheels of a spinning wheel set 4;

secondly, starting a main shaft 1 of the spinning machine, driving a thick-wall seamless pipe blank 3 to rotate by the main shaft 1 through a first internal expanding type clamp 2, enabling an internal rotating wheel and an external rotating wheel of a rotating wheel group 4 to move from bottom to top from the end part of the thick-wall seamless pipe blank 3, enabling materials of the thick-wall seamless pipe blank 3 to flow in the opposite direction, and carrying out reverse rotation forming; the spinning wheel performs multi-pass spinning on the thick-wall seamless pipe blank 3 to form a seamless thin-wall cylindrical blank 6;

thirdly, withdrawing the rotating wheel set 4 and taking out the seamless thin-wall cylindrical part blank 6;

fourthly, clamping and fixing the seamless thin-wall cylindrical part blank 6 on the main shaft 1 through a second internal expansion type clamp 5;

fifthly, clamping a seamless thin-wall cylindrical part blank 6 by a rotary roller group 7 for double-roller clamping and spinning to form by double-roller clamping and spinning, and controlling the motion track of the rotary roller to form a required complex profile;

and sixthly, withdrawing the rotary roller group 7 for double-roller clamping and spinning, and removing the clamping force of the second internal expansion type clamp 5 to obtain the finally formed thin-wall rotary part with the complex molded surface.

In the process of carrying out paired wheel spinning processing on the thick-wall seamless tube blank 3 by the spinning wheel set 4, the seamless thin-wall cylindrical blank 6 with the required diameter and wall thickness can be obtained by controlling the radial movement and the clamping force of the spinning wheel set 4.

The second internal expanding type clamp 5 drives the seamless thin-wall cylindrical part blank 6 to rotate in the double-roller clamping and spinning process, and the diameter and the rotating speed are adjustable.

The rotary roller group 7 for double-roller clamping spinning can rotate actively and provide friction force in the forming process; meanwhile, a thin-wall rotary part with a complex profile characteristic can be formed by controlling the motion track of the rotary roller group 7 for double-roller clamping spinning.

The spinning of the pair of wheels adopts four pairs of spinning wheels to be uniformly distributed along the circumferential direction of the workpiece, and simultaneously, the inner surface and the outer surface of the workpiece are processed.

The invention has the following beneficial effects:

the invention provides a new forming process method for the thin-wall revolving body part with the complex molded surface; the problems that blanks which are formed into thin-wall revolving body parts with complex profiles and need to be manufactured in a roll welding mode are prone to cracking at welding seams in the later processing process, a large number of core molds are needed for blank manufacturing by flow spinning and the like are solved in principle.

The invention is simple and easy to operate, adopt the composite forming way of pair wheel spinning blank making and two-roller clamping spinning to process the thin-walled revolving body part with complicated profile, the work piece is out of shape symmetrically while pair wheel spinning, the stress state is improved, the dimensional accuracy is improved, and can dispel the longitudinal weld, the part of different specifications does not need to change the mandrel, the apparatus cost is low; the forming method has the advantages of small forming load, high size precision, high surface quality, high material utilization rate and high processing efficiency, and has good application value in the fields of aviation, aerospace, war industry and civil use.

Drawings

FIG. 1 is a schematic view of the wheel spin forming of the present invention.

FIG. 2 is a bottom view of the wheel spin forming of the present invention.

Figure 3 is a schematic view of the present invention of twin roll nip spin forming.

Detailed Description

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

Referring to fig. 1, 2 and 3, a composite forming method of paired wheel spinning and double-roller clamping spinning of a thin-wall revolving body part is provided, wherein the paired wheel spinning adopts an inner spinning wheel, four pairs of spinning wheels are uniformly distributed along the circumferential direction of a workpiece, and the inner surface and the outer surface of the workpiece are simultaneously processed; carrying out paired wheel spinning on a thick-wall seamless pipe blank to obtain a seamless thin-wall cylindrical part blank, and then clamping and spinning by adopting double rollers to form a complex profile part; the method specifically comprises the following steps:

firstly, clamping a thick-wall seamless pipe blank 3 on a first internal expanding type clamp 2 of a spinning machine, and clamping the thick-wall seamless pipe blank 3 by using internal and external spinning wheels in a spinning wheel set 4;

secondly, starting a main shaft 1 of the spinning machine, driving a thick-wall seamless pipe blank 3 to rotate through a first internal expanding type clamp 2, enabling an internal rotating wheel and an external rotating wheel of a rotating wheel group 4 to move from bottom to top from the end part of the thick-wall seamless pipe blank 3, enabling the material of the thick-wall seamless pipe blank 3 to flow in the opposite direction, and carrying out reverse rotation forming; the spinning wheel performs multi-pass spinning on the thick-wall seamless pipe blank 3 to form a seamless thin-wall cylindrical blank 6;

the spinning wheel group 4 can obtain the seamless thin-wall cylindrical part blank 6 with required diameter and wall thickness by controlling the radial movement and the clamping force of the spinning wheel group 4 in the process of spinning the thick-wall seamless pipe blank 3;

the second internal expanding type clamp 5 drives the seamless thin-wall cylindrical part blank 6 to rotate in the double-roller clamping and spinning process, and the diameter and the rotating speed are adjustable;

sixthly, withdrawing the rotary roller group 7 for double-roller clamping and spinning, and removing the clamping force of the second inner expansion type clamp 5 to obtain the finally formed thin-wall rotary part with the complex molded surface;

the rotary roller group 7 for double-roller clamping spinning can rotate actively, provides friction force in the forming process and improves the forming quality; meanwhile, a thin-wall rotary part with a complex profile characteristic can be formed by controlling the motion track of the rotary roller group 7 for double-roller clamping spinning.

Claims

1. the composite forming method of wheel spinning and double-roll clamping spinning of thin-walled revolving body parts, it is characterized in that: first thick-walled seamless tube blank is carried out wheel spinning to obtain seamless thin-walled cylindrical piece blank, Then, the complex profile parts are formed by double-roll clamping and spinning; the specific steps include:

In the first step, the thick-walled seamless tube blank (3) is clamped on the first inflatable clamp (2) of the spinning machine, and the thick-walled seamless tube blank is formed by the inner and outer rotating wheels of the rotary wheel group (4). (3) Clamp;

The second step is to start the main shaft (1) of the spinning machine. The main shaft (1) drives the thick-walled seamless pipe blank (3) to rotate through the first inflatable clamp (2), and the inner and outer rotation of the rotary wheel group (4) The wheel starts to move from bottom to top from the end of the thick-walled seamless tube blank (3), and the material of the thick-walled seamless tube blank (3) flows in the opposite direction for reverse rotation forming; The blank (3) is subjected to multi-pass spinning to form a seamless thin-walled cylindrical blank (6);

The third step is to withdraw the rotary wheel group (4), and take out the seamless thin-walled cylindrical blank (6);

In the fourth step, the seamless thin-walled cylindrical blank (6) is clamped and fixed on the main shaft (1) through the second inflatable clamp (5);

In the fifth step, the seamless thin-walled cylindrical blank (6) is clamped by the double-roller clamping and spinning roller group (7) for dual-roller clamping and spinning, and the movement trajectory of the rotating roller is controlled to form the required complex Profile;

The sixth step is to withdraw the rotary roller group (7) for clamping and spinning with two rollers, and remove the clamping force of the second internal expansion clamp (5) to obtain a final formed thin-walled revolving body with a complex profile. Components.

2. The composite forming method of wheel spinning and double-roll clamping spinning of a thin-walled revolving body part according to claim 1, characterized in that: the wheel group (4) has no surface for thick-walled parts. During the spinning process of the seam tube blank (3), the seamless thin-walled cylindrical blank (6) with the required diameter and wall thickness can be obtained by controlling the radial movement and the clamping force of the rotary wheel group (4). .

3. The composite forming method of wheel spinning and twin-roll clamping spinning of a thin-walled revolving body part according to claim 1, characterized in that: the second internal expansion clamp (5) is in the double-roller clamping and spinning. In the process of roller clamping and spinning, the seamless thin-walled cylindrical blank (6) is driven to rotate, and the diameter and rotation speed are adjustable.

4. The composite forming method of a kind of thin-walled revolving body part-to-wheel spinning and dual-roll clamping spinning according to claim 1, characterized in that: the dual-roll clamping and spinning is used for the rotary roller group ( 7) Active rotation can be performed to provide friction during the forming process; at the same time, thin-walled revolving parts with complex profile features can be formed by controlling the movement trajectory of the double-roller clamping and spinning roller group (7).

5. The composite forming method of wheel spinning and double-roll clamping spinning of a thin-walled revolving body part according to claim 1, characterized in that: the wheel spinning adopts four pairs of rotary wheels along the workpiece. It is evenly distributed in the circumferential direction, and the inner and outer surfaces of the workpiece are processed at the same time.