CN102601199A - Precise-spin reducing device for fixed core type thin wall pipe - Google Patents

Abstract

The invention discloses a new device for precision spinning and reducing the diameter of a thin-walled tube with a fixed core mode, which includes a positioning and clamping part, a tube blank, a spinning and reducing diameter forming and a mandrel shaping part; the positioning and clamping part includes a chuck, and the The chuck is connected with an elastic sleeve; the tube blank is inserted into the elastic sleeve and clamped on the chuck together; the part of the spinning compression diameter forming and core mold shaping part includes a fixed block, and the fixed block is connected with a core One end of the fixed block is connected with a diameter-reducing die, and the core die is arranged inside the reduced-diameter die, and the other end of the fixed block is connected with a tailstock. The invention can be mounted on an ordinary lathe or a special spinning machine to complete the precision spinning and reducing diameter forming of thin-walled tubes, and the invention is mainly suitable for medium and small batch production occasions.

Description

A precision spinning and reducing device for thin-walled tubes with fixed core mode

technical field

The invention relates to a pipe diameter reduction forming process device, in particular to a new fixed core mode spinning diameter reduction device for precise diameter reduction of thin-walled pipes.

Background technique

Driven by weight reduction, cost reduction and quality improvement in the automotive and aerospace fields, more and more parts are made of pipes, and pipe reduced-diameter parts have the advantages of high efficiency, high quality, economy, high strength, and high rigidity. Parts with different diameters can be obtained by forming methods such as shrink forming and drawing forming of the pipe. However, the pipe is used to manufacture automobile and aerospace parts, and its forming method mainly adopts the push-shrink forming of the open mold. As the shape and dimensional accuracy of reduced-diameter parts become higher and higher, push-shrink forming has developed from coreless push-shrink forming to cored push-shrink forming. There are two types of fixed mandrel type and floating mandrel type with core pushing and shrinking. The mandrel has entered the pipe before the diameter is reduced. When the pipe is reduced in diameter, the mandrel simultaneously squeezes the pipe wall in the sizing area. Deformation, which will cause the pipe fittings to be subjected to a large axial pushing force, and buckling and instability deformation of the pipe wall are prone to occur. Push-shrink forming mainly includes punching and shrinking method, spinning forming and so on. The degree of deformation of the one-time necking process of the punching and shrinking method is limited. The main limiting factor is that when the axial pressure of the tube wall in the force transmission area is too large, the longitudinal instability will cause ring wrinkles or local depressions, or the tube wall in the deformation zone will be deformed due to the tangential direction. The effect of compressive stress is prone to tangential instability and wrinkling. In order to strengthen the stamping and shrinking process, heating shrinking can be used, and a special heating shrinking device is designed, but the equipment cost increases. Spinning and shrinking methods usually design a special spinning machine, which is expensive and not suitable for the production of small and medium batches of pipe fittings. Therefore, it is necessary to design a new pipe reducing device with low cost, high efficiency and high product precision.

Contents of the invention

The purpose of the present invention is to overcome the above problems in the prior art, and provide a new device for rotating and compressing the diameter of fixed core mode, which has the advantages of simple structure and high product precision.

In order to achieve the above-mentioned technical purpose and achieve the above-mentioned technical effect, the present invention is realized through the following technical solutions:

A new device for precision spinning and reducing the diameter of a thin-walled tube with a fixed core mode, including a positioning and clamping part, a tube blank, a spinning and reducing diameter forming part, and a mandrel shaping part; the positioning and clamping part includes a chuck, and the chuck is connected with Elastic sleeve; the tube blank is inserted into the elastic sleeve and clamped on the chuck together; the part of the spinning compression diameter forming and core mold shaping part includes a fixed block, and the fixed block is connected with a core mold. One end of the fixed block is connected with a diameter-reducing die, and the core die is arranged inside the reduced-diameter die, and the other end of the fixed block is connected with a tailstock.

Further, the fixing block is connected with the core mold through pins.

Further, the fixing block is connected with the reducing die by screws.

The beneficial effects of the present invention are:

A new device for precision spinning and reducing the diameter of thin-walled tubes with fixed core mode is provided. This device is used on ordinary lathes or special spinning machines. The tube blank is inserted into the elastic sleeve and clamped on the chuck for rotation. The spinner installed in the tailstock The compression diameter die is used for longitudinal feeding movement, and the thin-walled tube diameter reduction is completed by using the rotary compression die. of smoothness. Since the necking is gradually carried out, the risk of instability in the shrinking force and force transmission area is greatly reduced. At the same time, due to the high-speed rotation of the tube blank with the lathe spindle, the friction between the spinning compression die and the tube wall heats up, reducing the deformation resistance of the tube, which is beneficial to the plastic deformation of the material in the deformation zone, and the temperature of the tube wall in the force transmission zone is higher than that in the deformation zone. The force transmission performance is not affected at low temperature, so the deformation degree of single necking can be improved. During the spinning process, lubricate with lubricating oil and cool to avoid excessive temperature, there is a danger of pipe and mold sticking. The invention has the advantages of reasonable design, simple structure, convenient operation, high product precision and good performance, and low manufacturing cost. The invention can be mounted on an ordinary lathe or a special spinning machine to complete the precision spinning and reducing diameter forming of thin-walled tubes, and the invention is mainly suitable for medium and small batch production occasions.

The above description is only an overview of the technical solutions of the present invention. In order to understand the technical means of the present invention more clearly and implement them according to the contents of the description, the preferred embodiments of the present invention and accompanying drawings are described in detail below. The specific embodiment of the present invention is given in detail by the following examples and accompanying drawings.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

Fig. 1 is the working state schematic diagram of spinning compression die of the present invention;

Fig. 2 is a schematic diagram of the mandrel shaping working state of the present invention.

Explanation of symbols in the figure: 1, chuck, 2, elastic sleeve, 3, tube blank, 4, mandrel, 5, reducing die, 6, pin, 7, fixed block, 8, tailstock, 9, screw .

Detailed ways

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

As shown in Fig. 1, a new device for precision spinning and reducing the diameter of a thin-walled tube with a fixed core mode includes a positioning and clamping part A, a tube blank 3, a spinning and reducing diameter forming and a mandrel shaping part B; the positioning and clamping part A Including a chuck 1, the chuck 1 is connected with an elastic sleeve 2; the tube blank 3 is inserted into the elastic sleeve 2 and clamped on the chuck 1 together; the spinning compression diameter forming and mandrel shaping part B comprises a fixed block 7, the fixed block 7 is connected with a mandrel 4, one end of the fixed block 7 is connected with a diameter-reducing die 5, and the mandrel 4 is arranged in the die-reducing die 5, the The other end of the fixed block 7 is connected with a tailstock 8 .

Further, the fixing block 7 is connected with the core mold 4 through pins 6 .

Further, the fixing block 7 is connected to the reducing die 5 through screws 9 .

，且安装在固定块7上的缩径凹模5在尾架8带动下作纵向送进运动

，将管坯3端头挤压进缩径凹模5，完成管坯3的缩径成形；最后，缩径凹模5退出，尾架8带动芯模4作纵向进给运动

，由芯模4对已缩径成形的管端内孔整形，保证缩径后有配合要求的内径精度和内壁的光洁度。 When the device works, firstly, the tube blank 3 is inserted into the elastic sleeve 2 and clamped by the chuck 1; then, the machine tool works, the chuck 1 and the elastic sleeve 2 clamp the tube blank 3 for rotational movement

, and the reducing die 5 installed on the fixed block 7 is driven by the tailstock 8 for longitudinal feeding movement

, extrude the end of the tube blank 3 into the shrinking die 5 to complete the shrinking forming of the tube blank 3; finally, the shrinking die 5 exits, and the tailstock 8 drives the mandrel 4 for longitudinal feed movement

, the mandrel 4 is used to shape the inner hole of the pipe end that has been reduced in diameter, so as to ensure that the inner diameter accuracy and the smoothness of the inner wall are met after the diameter is reduced.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (3)

1. the accurate spinning undergauge of a fixed core pattern light-wall pipe new equipment is characterized in that: comprise location clamping part (A), pipe (3), spinning reducing formation and core shaping unit (B); Said location clamping part (A) comprises chuck (1), and said chuck (1) is connected with resilient sleeve (2); Said pipe (3) insert said resilient sleeve (2) together clamping in said chuck (1); Said spinning reducing formation and core shaping unit (B) comprise fixed block (7); Be connected with core (4) in the said fixed block (7); Said fixed block (7) one ends are connected with undergauge die (5); Be provided with said core (4) in the said undergauge die (5), said fixed block (7) other end is connected with tailstock (8).

2. the accurate spinning undergauge of fixed core pattern light-wall pipe according to claim 1 new equipment is characterized in that: said fixed block (7) is connected through pin (6) with said core (4).

3. the accurate spinning undergauge of fixed core pattern light-wall pipe according to claim 1 new equipment, it is characterized in that: said fixed block (7) is connected through screw (9) with said undergauge die (5).

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