CN204842595U - Preventing in derotation technology changes device - Google Patents

Abstract

The utility model discloses an anti-rotation device in the anti-rotation process, which belongs to the field of spinning process equipment, and includes a mandrel and a stripping ring, and is characterized in that it also includes a stopper A and a stopper B, and the stopper A It is fixed on the flange of the mandrel, and the stopper B is fixed on the end of the stripping ring away from the stopper A. The utility model can effectively prevent the workpiece from sliding in the circumferential direction of the mandrel, thereby Effectively improve the qualification rate of the workpiece, which can ensure the reliable limit of the workpiece circumferential direction during the reverse rotation process, and will not cause the torque change due to the adjustment of the workpiece process parameters, which will cause scrapping of the workpiece. The workpiece omits the processing of the outer cone surface, and only needs to It only needs to mill out a rectangular notch on the end face of the workpiece, which improves the processing efficiency and pass rate of the workpiece.

Description

Anti-rotation device in anti-rotation process

technical field

The utility model relates to equipment in the spinning process, in particular to an anti-rotation device in the reverse spinning process.

Background technique

The anti-spin process in strong spinning is a pressure processing method suitable for forming thin-walled tubular rotary workpieces. It is a process in which the mandrel drives the workpiece to rotate, and the rotary wheel exerts pressure on the workpiece locally. Through the relative movement of the workpiece and the rotary wheel However, it advances step by step and continuously along the spiral trajectory, the direction of material flow is opposite to the direction of spinning movement, and the forming method of accumulatively forming the entire thin-walled tubular workpiece.

During the anti-rotation process, the end surface of the workpiece is attached to the ring surface of the stripping material, and the rotary wheel contacts the workpiece to produce plastic deformation. When the rotary wheel contacts the workpiece, the deformation point of the workpiece is subjected to radial compressive stress Fz, circumferential compressive stress Fy, and axial compressive stress Fx The three-way compressive stress state, while the circumferential compressive stress Fy produces a torque T opposite to the rotation direction of the workpiece, the torque T is transmitted along the workpiece to be deformed to the stripping ring in contact with the workpiece, and the contact surface between the stripping ring and the workpiece exists Torque T, therefore, in the spinning process, the friction between the workpiece and the ejection device is large enough to generate sufficient torque, so that the workpiece and the mandrel do not slip in the circumferential direction. If the design of the anti-rotation device in spinning is unreasonable, it is easy to produce the workpiece along the circumferential direction, resulting in the scrapping of the workpiece, as shown in Figure 1.

The anti-rotation device of traditional powerful spinning equipment usually uses a sawtooth stripping ring or a stripping ring with an inner cone surface and other structures. When the sawtooth-shaped stripping ring anti-rotation device is used, the end face of the stripping ring and the workpiece end face are in multi-point contact under working conditions. When the thinning rate and feed ratio increase, the torque required by the workpiece will also increase, and the stripping ring Can not produce enough torque with the workpiece, the friction between the stripping ring and the workpiece is converted from static friction to dynamic friction, and the workpiece is prone to slip in the circumferential direction of the mandrel during the spinning process, resulting in the scrapping of the spinning workpiece. When the stripping ring adopts the inner cone surface, the torque required by the workpiece will be transmitted through the bonding surface between the inner cone surface of the stripping ring and the outer cone surface of the workpiece, but the inner cone surface of the stripping ring and the outer cone surface of the workpiece It is extremely difficult to achieve consistent angles, resulting in a line-to-surface contact between the stripping ring and the tapered surface of the workpiece. The torque provided by this cooperation to the workpiece is not stable enough, and it is easy to cause slippage between the workpiece and the mandrel in the circumferential direction, resulting in the scrapping of the spinning workpiece . Therefore, it is very important to effectively solve the sliding problem between the workpiece and the mandrel.

Contents of the invention

The purpose of this utility model is to provide an anti-rotation device in the anti-rotation process to solve the above-mentioned sliding problem between the workpiece and the mandrel.

In order to achieve the above purpose, the technical solution adopted by the utility model is as follows: an anti-rotation device in the anti-rotation process, including a mandrel and a stripping ring, and also includes a stopper A and a stopper B, and the stopper A It is fixed on the flange of the mandrel, and the stopper B is fixed on the end of the stripping ring away from the stopper A.

In the above-mentioned technical solution, the stopper A limits the position in the circumferential direction of the stripping ring, the stopper B limits the position in the circumferential direction of the workpiece, and provides the torque T in the circumferential direction of the workpiece, so that the workpiece does not need to be adjusted during the spinning process parameter debugging process or in batch production. Sliding in the circumferential direction will occur to ensure smooth spinning of workpieces; it is especially suitable for reliable positioning of large quantities of thin-walled tubular workpieces.

As a preferred technical solution: the block A is fixed with screws and positioning pins. This method is more stable and reliable.

As a preferred technical solution: the stopper B is fixed by welding. This method is more stable and reliable.

Compared with the prior art, the utility model has the advantages of:

1) In batch production of traditional anti-rotation devices, it is easy to cause the workpiece and the mandrel to slip in the circumferential direction, but the utility model can effectively prevent the workpiece from slipping in the mandrel in the circumferential direction, thereby effectively improving the pass rate of the workpiece;

2) The new anti-rotation device of the utility model can ensure the reliable position limit of the workpiece in the reverse rotation process, and will not cause the workpiece to be scrapped due to the change of the torque due to the adjustment of the workpiece process parameters;

3) Traditional workpieces and stripping rings use taper surfaces. Each workpiece needs to process the outer taper surface. Not only does the lathe worker need to add a separate process, but it is also difficult to ensure that the outer taper surface of the workpiece and the inner taper surface of the stripping ring are consistent. Surface contact, while in the anti-rotation device of the utility model, the machining of the outer cone surface of the workpiece is omitted, and only a rectangular gap needs to be milled on the end surface of the workpiece, which improves the processing efficiency and pass rate of the workpiece.

Description of drawings

Figure 1 is a schematic diagram of the spinning mechanics of the derotation process;

Fig. 2 is a schematic structural diagram of the anti-rotation device of the embodiment of the present invention.

In the figure: 1, workpiece; 2, rotary wheel; 3, mandrel; 4, stripping ring; 5, block A; 6, block B.

Detailed ways

The utility model will be further described below in conjunction with accompanying drawing.

Example:

Referring to Fig. 2, an anti-rotation device in the anti-rotation process includes a mandrel 3 and a stripping ring 4, and also includes a stopper A5 and a stopper B6, and the stopper A5 is fixed on the mandrel 3 by screws and positioning pins On the flange, the stopper B6 is welded and fixed on the end of the stripping ring 4 away from the stopper A5;

When in use, the workpiece 1 is driven by the mandrel to move. When the rotary wheel 2 is in contact with the workpiece 1, the workpiece is hindered by the rotary wheel 2 and deformed. The workpiece 1 must bear a compressive stress Fy in the circumferential direction. The torsional torque T in the circumferential direction, the stopper B6 limits the circumferential direction of the workpiece 1, and provides the torque T in the circumferential direction of the workpiece 1, the stopper B6 and the stripping ring 4 are connected together by welding; the stripping ring 4 is connected by the stopper A5 The limit position in the circumferential direction of the ring 4 provides the torque required for the stripping ring 4, so that the workpiece 1 will not slip in the circumferential direction during the adjustment of the spinning process parameters or in the batch production, ensuring smooth spinning of the workpiece.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (3)

1. An anti-rotation device in an anti-rotation process, comprising a mandrel and a stripping ring, characterized in that: it also includes a stopper A and a stopper B, and the stopper A is fixed on the flange of the mandrel , the stopper B is fixed on the end of the stripping ring away from the stopper A. 2. The anti-rotation device in the anti-rotation process according to claim 1, wherein the stopper A is fixed by screws and positioning pins. 3. The anti-rotation device in the anti-rotation process according to claim 1, wherein the stopper B is fixed by welding.