CN113909367B

CN113909367B - Necking type multi-claw spinning machine head

Info

Publication number: CN113909367B
Application number: CN202111162045.5A
Authority: CN
Inventors: 李良有; 李良宏; 尹超杰
Original assignee: Zhengjiang Changxing Heliang Intelligent Equipment Co Ltd
Current assignee: Zhengjiang Changxing Heliang Intelligent Equipment Co Ltd
Priority date: 2020-03-01
Filing date: 2020-03-01
Publication date: 2023-06-23
Anticipated expiration: 2040-03-01
Also published as: CN111618153B; CN111618153A; CN113909367A

Abstract

The invention relates to a necking spinning system and a necking multi-claw spinning machine head, and belongs to the technical field of pipe processing. The processing system comprises a material clamping machine head, a necking multi-claw spinning machine head and a rotary driving device; the material clamping machine head comprises a rotary main shaft which is rotatably arranged on the tail end part of the machine frame around a rotary central axis, and a material clamping claw which is arranged on the front end part of the rotary main shaft and is used for clamping a pipe blank; the necking multi-claw spinning machine head comprises an extrusion part group; the rotary driving device is arranged on the frame and is used for driving the extrusion piece of the rotary main shaft relative to the necking multi-jaw spinning machine head to rotate around the rotary central axis; the extrusion group is composed of more than one rolling necking extrusion and more than one hard friction tool necking extrusion. The spinning system can ensure the spinning method of the spinning qualification rate of the hard copper tube, reduce the manufacturing cost of products, and can be widely applied to the manufacturing fields of refrigeration, automobiles, aviation and the like.

Description

Necking type multi-claw spinning machine head

The present application is a divisional application of patent application number CN202010133364.2 entitled "a spinning method and a spinning system".

Technical Field

The invention relates to the technical field of pipe spinning processing, in particular to a necking multi-claw spinning machine head which can be used for constructing a spinning processing system.

Background

The spinning machine is commonly used for processing and producing tubular parts and structurally comprises a frame, a clamping machine head, a spinning machine head and a rotary driving device, wherein the clamping machine head, the spinning machine head and the rotary driving device are arranged on the frame; the material clamping machine head comprises a material clamping claw, and the spinning machine head comprises an extrusion piece and an extrusion driving device for driving the extrusion piece to extrude; in the working process, the extrusion part group and the pipe fitting clamped on the clamping claw are driven to rotate relatively under the drive of the rotary driving device, and meanwhile, the extrusion driving device is used for driving the extrusion part group to synchronously perform extrusion action, so that a formed pipe part with a preset shape is spun on a pipe section of the pipe fitting to be spun.

Wherein, the spinning machine head is divided into a multi-claw spinning machine head and a single-claw spinning machine head according to the number of the extrusions such as the spinning wheel, the spinning ball, the spinning block and the like, thereby constructing a single-claw spinning machine with only one extrusion, such as the spinning machine disclosed in patent document with publication number CN209753846U, and a multi-claw spinning machine comprising more than two extrusions, such as the spinning machine disclosed in patent document with publication number CN108080480A and the like; for multi-jaw spinning machines, the extrusion group thereon comprises more than two extrusions, typically consisting of three extrusions surrounding the central axis of rotation, and the three extrusions are identical in structure. According to the different tools and dies selected for spinning, the relative motion form and the stress condition between the extrusion action part of the extrusion part and the device to be spun in the spinning process are different, and the three types of necking of the spinning die, necking of the spinning wheel and necking of the friction tool are applicable to flaring structures; for multi-jaw spinning machines, there are generally rolling-type extrusions and friction-tool-type extrusions, wherein the rolling-type extrusions are generally selected from wheel-type structures or ball-type structures, and in the current spinning of tubular parts, the rolling-type extrusions are basically used as spinning acting members; and friction tool type extrusion parts such as block-shaped and wheel-shaped extrusion parts are commonly used for necking spinning processing of plate-shaped components. Because the rotary wheel type extrusion has advantages over friction tool type extrusion in terms of durability, cost and the like, the existing friction tool necking extrusion is basically replaced by the rotary wheel type extrusion, and even replaces the extrusion of a ball structure type in most occasions. In the use, need order about the clamp claw and drive tube blank and extrusion piece relative rotation, specific mode has two kinds: (1) The rotary driving device drives the clamping claw to rotate through the rotary driving main shaft so as to drive the pipe clamped by the clamping claw to rotate, and drives the rotary pressing wheel to feed in the radial direction and the axial direction of the pipe through the feeding mechanism so as to spin a preset shape at the end part of the pipe and the like, for example, a spinning machine as disclosed in application number CN 201811599148.6; (2) The rotary driving device rotationally drives the main shaft to drive the spinning wheel to rotate around the rotary central axis, and simultaneously drive the spinning wheel to radially feed the pipe material, and the clamping claw is used for clamping the pipe material and can drive the pipe material to axially feed, wherein the feeding can be performed by the spinning wheel, for example, a spinning machine disclosed in the publication No. CN 201611043982.8.

Compared with the existing copper pipe commonly used for spinning tubular parts, the hard copper pipe has good advantages in structural strength and cost, in particular cost advantages; however, because the hard copper tube has low purity and contains a large amount of impurities, the problems of surface fuzzing, peeling, cracking and the like are found when the existing multi-claw spinning equipment is adopted for spinning, and particularly, a multi-claw spinning machine constructed by a spinning wheel type extrusion piece is difficult to process and manufacture qualified products.

Disclosure of Invention

The main purpose of the invention is to provide a necking multi-claw spinning machine head, which can effectively ensure the spinning forming qualification rate of a hard copper pipe and reduce the manufacturing cost of partial copper pipe products.

In order to achieve the main purpose, the necking multi-jaw spinning machine head provided by the invention comprises a mounting slide plate, a linear displacement output device, an extrusion part group and an extrusion driving device for driving the extrusion part group to perform extrusion action, wherein the extrusion part group comprises more than two extrusion parts; the extrusion driving device is arranged on the installation sliding plate, and the linear displacement output device is used for driving the installation sliding plate to reciprocate; the extrusion part group is composed of more than one rolling necking extrusion part and more than one hard friction tool necking extrusion part.

Compared with the extrusion of the multi-claw spinning machine constructed by adopting the same tool and die in the prior art, the invention combines the rolling necking extrusion and the friction tool necking extrusion in the prior tool and die to form an extrusion group, thereby carrying out spinning treatments of different stress and relative movement on the same tube blank, the friction tool type extrusion is constructed by using hard materials, and through verification of mass product production, the combination mode can effectively ensure the rate of finished products of spinning forming of the hard copper tube, so that parts of copper tube parts can be processed by using the hard copper tube, and the processing and generating cost of the parts is effectively reduced.

The specific scheme is that the multi-claw spinning machine head is a three-claw spinning machine head; the extrusion part group consists of two rolling necking extrusion parts and a necking extrusion part of a hard friction tool. The technical scheme not only can ensure balanced stress, but also can ensure molding quality.

The extrusion driving device comprises a swinging rod and a swinging driving unit for driving the swinging rod to swing and feed; an extrusion is mounted on the end of the swing rod.

The concrete scheme is that the rolling necking extrusion part is a rotary wheel type extrusion part. According to the technical scheme, the rotary wheel is selected from the ball and the rotary wheel to serve as a rolling extrusion piece, so that the service life of the extrusion piece is effectively prolonged, and the finished product rate of later processing is ensured.

The effective extrusion surface of the necking extrusion part of the hard friction tool is a convex continuous smooth curved surface. The technical scheme can well shape structures with different shapes and curvature radiuses.

The more specific scheme is that the curvature radius of the effective spinning curved surface part of the necking extrusion part of the hard friction tool is equal to or smaller than that of the effective spinning curved surface part of the spinning wheel type extrusion part. The technical scheme can effectively utilize extrusion parts such as blocks and the like to ensure the molding processing quality of transition positions between positions with larger curvature radius differences.

The preferred solution is that the pressers in the pressers group are arranged uniformly around the rotation central axis, and the core rod is arranged at the central position. The technical scheme can further improve the stress balance of the three extrusion parts.

The preferable scheme is that the necking extrusion part of the hard friction tool is a spinning block made of die steel; performing CVD treatment on at least the effective extrusion surface of the spinning block; the rolling necking extrusion part is a rotary pressing wheel made of die steel. The technical scheme adopts the die steel after CVD treatment as the hard friction tool type extrusion piece, and can effectively ensure the finished product rate of the processed product due to the wear resistance and hardness of the die steel while prolonging the service life.

The preferable scheme is that the extrusion driving device for driving the extrusion piece to perform extrusion action on the necking multi-claw spinning machine head comprises a swinging rod and a swinging driving unit for driving the swinging rod to swing and feed; an extrusion is mounted on the end of the swing rod.

Drawings

FIG. 1 is a perspective view of the spinning system of embodiment 1 of the present invention with the shield omitted;

FIG. 2 is an enlarged view of part A of FIG. 1;

FIG. 3 is a perspective view of a multi-jaw spinning head according to example 1 of the present invention;

FIG. 4 is an enlarged view of part B of FIG. 3;

FIG. 5 is a partial construction view of a multi-jaw spinning head according to embodiment 2 of the present invention;

FIG. 6 is a partial construction view of a multi-jaw spinning head according to embodiment 3 of the present invention;

FIG. 7 is a partial construction view of a multi-jaw spinning head according to embodiment 4 of the present invention;

FIG. 8 is a partial construction view of a multi-jaw spinning head according to embodiment 5 of the present invention;

FIG. 9 is a partial construction view of a multi-jaw spinning head according to embodiment 6 of the present invention;

FIG. 10 is a partial construction view of a multi-jaw spinning head according to embodiment 1 of the present invention;

FIG. 11 is a partial construction view of the multi-jaw spinning head of comparative example 2;

FIG. 12 is a partial construction view of the multi-jaw spinning head of comparative example 3;

FIG. 13 is a partial construction view of the multi-jaw spinning head of comparative example 4;

FIG. 14 is a partial construction view of the multi-jaw spinning head of comparative example 5;

FIG. 15 is a partial photograph of a sample molded using example 1 of the present invention;

FIG. 16 is a partial photograph of a sample molded using example 1 of the present invention;

FIG. 17 is a partial photograph of a sample having a crack;

FIG. 18 is a partial photograph of a sample with fuzzing;

FIG. 19 is a partial photograph of a sample with fuzzing;

FIG. 20 is a partial photograph of a sample with skinning;

fig. 21 is a partial photograph of a sample with skinning.

Detailed Description

The invention is further described below with reference to examples and figures thereof.

The main idea of the present invention is to improve the structure of a multi-jaw spinning head of a spinning machine, mainly to improve the combination mode of different types of dies in an extrusion group, and based on the idea, in the following embodiments, mainly the combination mode of extrusion components is described as an example, and the structure of the spinning machine and a loading and unloading device thereof can be designed with reference to the structure of the existing product, and is not limited to the example description of the following embodiments.

Example 1

Referring to fig. 1 to 4, the spinning system 1 of the present invention comprises a frame 10, a control device mounted on the frame 10, a loading and unloading device 11, a clamping head 12, a multi-jaw spinning head 13, a rotary driving device, a forming mechanism 39 and a protective cover covering the relevant processing units.

The control device comprises a control cabinet 15, a processor arranged in the control cabinet 15, a memory, a touch control screen and a status display lamp 16 arranged on the control cabinet 15, wherein the memory stores a computer program; the control instructions of operators are received through the touch control panel or the keys, so that the processor executes corresponding computer programs stored in the memory, and the functional units are controlled to execute corresponding actions according to a preset sequence so as to perform feeding, spinning and unloading, and a formed part with a desired shape is obtained. The multi-claw spinning machine head 13 and the material clamping machine head 12 are both arranged on the frame 10, and the multi-claw spinning machine head 13 is positioned on the downstream side of the material clamping machine head 12 in the X-axis positive direction; in the Y-axis direction, the loading and unloading device 11 is used for loading and unloading the clamping machine head 12 from the side of the clamping machine head 12, wherein the specific structure of the loading and unloading device 11 refers to the patent application document of the applicant and published application number CN 208341743U; in addition, a loading and unloading system as disclosed in patent document such as CN108856542a may be adopted, and technical content related to loading on the loading system is introduced into the present application, and is not described herein again as part of the present application. The gripping head 12 includes a rotary main shaft 20 rotatably mounted on a rear end portion of the frame 10 about a rotation center axis 100, and a gripping claw 21 for gripping a tube blank mounted on a front end portion of the rotary main shaft 20; the clamping claw 21 is used for clamping a tube blank to be spun to drive the tube blank to rotate synchronously, and in this embodiment, the specific structure is a multi-flap structure as shown in the figure, the specific structure refers to patent document with publication number CN104552076a which has been filed and disclosed by the applicant, and in addition, the design can be performed with reference to other structures in the existing product, and the structure is not limited to the structure exemplified in the figure.

The spinning head 13 comprises a bracket 30, an extrusion piece 31, an extrusion piece 32, an extrusion piece 33 and a core rod 38, a mounting slide plate 34 for mounting the bracket 30, an extrusion driving device which is arranged on the mounting slide plate 34 and is used for driving the three extrusion pieces to synchronously perform extrusion action, and a linear displacement output device 36 which is used for driving the mounting slide plate 34 to reciprocate along the X axial direction; the mounting sled 34 is a plate structure arranged along the XOY plane, i.e. along a horizontal plane. The mounting slide 34 is mounted on the frame 10 by a linear guide slider mechanism arranged in the X-axis direction. The extrusion driving device comprises a linear displacement output device 41, a push sleeve 42, a swinging lever 43, a swinging lever 44 and a swinging lever 45 which are hinged on the bracket 30, and a connecting rod 46, a connecting rod 47 and a connecting rod 48 which correspondingly connect the swinging lever mechanism 43, the swinging lever 44, the swinging lever 45, the driving end and the push sleeve 42 through a hinging mechanism; the extrusion piece 31, the extrusion piece 32 and the extrusion piece 33 are correspondingly fixed on the resistance end parts of the swinging lever 43, the swinging lever 44 and the swinging lever 45 through swinging

rods

311, 320 and 330, and the push sleeve 42 is driven by the linear displacement output device 41 to reciprocate along the X axial direction, so that the swinging levers are driven to push the extrusion piece to feed and extrude in the radial direction of the tube blank; the novel structure is an existing product, and a specific structure is designed by referring to the existing product. In the present embodiment, the linear displacement output device 41 is composed of a rotary motor, a timing belt mechanism, and a screw-nut mechanism, or may be constructed by directly changing a linear motor, a cylinder, or an oil cylinder. The linear displacement output device 36 is formed by adopting a rotary motor and a screw nut mechanism, and can also be directly constructed by adopting a linear motor, an air cylinder or an oil cylinder. The forming mechanism 39 is mounted on the bracket 30, and comprises a linear displacement output device 390, a linear guide rail sliding block mechanism 391 and a forming cutter 392, wherein the linear guide rail sliding block mechanism 391 is used for ensuring that the forming cutter 392 moves along a direction parallel to a YOZ plane, and the linear displacement output device 390 is used for driving the forming cutter 392 to extend to contact with the pipe fitting 01 so as to cut off the end part of the pipe fitting 01 rotating at a high speed to achieve the aim of cutting flat or chamfering the end surface; the next spinning process may be performed by cutting the molded part thus processed. The

pressing members

31, 32 and 33 are uniformly arranged around the rotation center axis 100, and together constitute the pressing member group in the present embodiment, wherein the rotation center axis 100 is the center axis of relative rotation of the pressing member group and the gripper jaw 21. In the spinning process, the rotary main shaft 20 is driven to rotate around the rotary central axis 100 relative to the extrusion of the spinning machine head 13 by a rotary driving device arranged on the frame 10, so that the tube blank clamped on the clamping claw 21 and the extrusion of the spinning machine head 13 are driven to rotate relatively, and in the description of the embodiment, the rotary central axis 100 is arranged along the X-axis direction, and the vertical direction is the Z-axis direction. In this embodiment, the rotary driving device is constructed using a rotary driving motor.

In addition, a pipe end trimming device can be additionally arranged to correct the pipe end, including an inner hole, an inverted inner and outer angle and the like, so that the one-time spinning treatment is improved, and the forming quality is improved.

As shown in fig. 4, in the present embodiment, the pressing member 33 and the pressing member 32 are a pressing roller rotatably mounted on the end of the swing lever, that is, a pressing roller type necking-in pressing member, and the pressing member 31 is a pressing roller fixed on the end of the swing lever, that is, a tool friction necking-in pressing member. In the embodiment, the spinning roller is constructed by adopting die steel, in particular to die steel with the model number of DC53, SKD61, SKD51, SKD11 and the like, and the swinging rod of the spinning roller can be constructed by adopting die steel with other hardness; the spinning block is made of hard materials such as die steel, tungsten steel, hard alloy and the like, in the application, the spinning block is firstly built by adopting materials with enough hardness according to the molding quality, then the spinning block is built by selecting hard materials with good wear resistance or hard materials with improved wear resistance after treatment according to the design life requirement, for example, the spinning block is built by adopting imported die steel with the model of DC53, and at least the effective extrusion surface of the spinning block is subjected to CVD treatment to improve the wear resistance, so that the service life of the spinning block is prolonged on the premise of ensuring the spinning molding quality, namely the spinning block is built by adopting DC53 die steel subjected to the CVD treatment in the molding of samples, and the swinging rod for fixedly mounting the extrusion piece 31 is built by adopting conventional die steel; as shown in fig. 4, the distal end portion of the spinning block has a smooth curved surface portion 310 which is convex outward.

The method for spinning the hard copper tube by adopting the spinning system 1 comprises the following steps that in the embodiment and the following embodiments, a tube blank of a spun sample is a copper tube with a model number of TP2Y and a state number of H80, but the method is not limited to the hard copper tube with the model number: (1) The method comprises the following steps of (1) feeding step, namely, a pipe blank with a fixed length is plugged into a clamping claw 21 in an open state by using a feeding and discharging device 11, and the end face of the pipe blank is positioned by a discharging block in a main shaft, so that the pipe blank 01 is clamped; next, the gripping claw 21 is controlled to grip the tube blank 01. (2) And a spinning step S2, controlling the extrusion group of the multi-jaw spinning machine head 13 to rotate relative to the tube blank 01 clamped on the clamping jaw 21 so as to spin the tube section of the tube blank 01 into a formed tube section with a preset shape. In this embodiment, the pipe segment portion spun into the formed pipe portion is the outer end portion of the pipe blank 01. (3) And in the discharging step S3, the clamping claw 21 is controlled to open, the pipe fitting subjected to spinning is pushed out of the clamping claw by using a pushing rod arranged in the rotary main shaft 20, and the feeding and discharging device 11 is used for receiving and discharging.

With the above-described structure, the extrusion group is constituted by the spinning roller 32, the spinning roller 33, and the spinning block 31, that is, in the present embodiment, the extrusion group is constituted by two rolling necking-type extrusions and one hard friction tool necking-type extrusion.

Example 2

As an explanation of embodiment 2 of the present invention, only the differences from embodiment 1 described above will be explained below. As shown in fig. 5, in the present embodiment, the extrusion group is composed of one spinning roller 51 and two spinning blocks 52, and a core rod 53 is also arranged at the center position, that is, in the present embodiment, the extrusion group is composed of one rolling necking extrusion and two hard friction tool necking extrusions.

Example 3

As an explanation of embodiment 3 of the present invention, only the differences from embodiment 1 described above will be explained below. As shown in fig. 6, in the present embodiment, the extrusion group is composed of two spinning balls 54 and one spinning block 55, and a mandrel 56 is also arranged at the center position, that is, in the present embodiment, the extrusion group is composed of two rolling necking type extrusions and one hard friction tool necking type extrusion.

Example 4

As an explanation of embodiment 4 of the present invention, only the differences from embodiment 1 described above will be explained below. Referring to fig. 7, in the present embodiment, the extrusion group is composed of one spinning ball 57 and two spinning blocks 58, and a core rod 59 is also arranged at the center position, that is, in the present embodiment, the extrusion group is composed of one rolling necking extrusion and two hard friction tool necking extrusions.

Example 5

As an explanation of embodiment 5 of the present invention, only the differences from embodiment 1 described above will be explained below. Referring to the structure shown in fig. 8, the extrusion group is composed of one spinning ball 61 and one spinning block 62, and a mandrel 63 is also arranged at the center position, that is, in this embodiment, the extrusion group is composed of one rolling necking extrusion and one hard friction tool necking extrusion.

Example 6

As an explanation of embodiment 6 of the present invention, only the differences from embodiment 1 described above will be explained below. Referring to the structure shown in fig. 9, the extrusion group is composed of one spinning roller 64 and one spinning block 65, and a mandrel 66 is also arranged at the center, that is, in this embodiment, the extrusion group is composed of one rolling necking extrusion and one hard friction tool necking extrusion.

Comparative example 1

As an explanation of the present comparative example 1, only the differences from the above-described embodiments 1 to 5 will be explained below, namely, the manner of combining different dies in the extrusion group will be described. Referring to the structure shown in fig. 10, in this comparative example 1, the extrusion group thereof is constituted by three spinning blocks 67, and a core rod 68 is also laid at the center position, that is, in this comparative example, the extrusion group is constituted by three hard friction tool necking-down type extrusions.

Comparative example 2

As an explanation of this comparative example 2, only the differences from the above-described embodiments 1 to 5 will be explained below, namely, the manner of combining different dies in the extrusion group will be described. Referring to the structure shown in fig. 11, in this comparative example 2, the extrusion group thereof is constituted by three spinning balls 69, and a mandrel 71 is also arranged at the center position, that is, in this comparative example, the extrusion group is constituted by three rolling necked-down extrusions.

Comparative example 3

As an explanation of this comparative example 3, only the differences from the above-described embodiments 1 to 5 will be explained below, namely, the manner of combining different dies in the extrusion group will be described. Referring to the structure shown in fig. 12, in this comparative example 3, the extrusion group thereof is constituted by one spinning ball 72 and two spinning rollers 73, and a core rod 74 is also arranged at the center position, i.e., in this comparative example, the extrusion group is constituted by three rolling necked-in extrusions.

Comparative example 4

As an explanation of this comparative example 4, only the differences from the above-described embodiments 1 to 5 will be explained below, namely, the manner of combining different dies in the extrusion group will be described. Referring to the structure shown in fig. 13, in this comparative example 4, the extrusion group thereof was constituted by three spinning rollers 75, and a mandrel 76 was also laid at the center position, that is, in this comparative example, the extrusion group was constituted by three rolling necked-down extrusions.

Comparative example 5

As an explanation of this comparative example 5, only the differences from the above-described embodiments 1 to 5 will be explained below, namely, the manner of combining different dies in the extrusion group will be described. Referring to the structure shown in fig. 14, in this comparative example 5, the extrusion group thereof is constituted by one spinning roller 77 and two spinning balls 78, and a core rod 79 is also laid at the center position, i.e., in this comparative example, the extrusion group is constituted by three rolling necked extrusion members.

The applicant carried out spinning necking treatment on the same hard copper tube by using a prototype, and rotationally extruded a molding part shown in a sample photograph of fig. 15 and the like, wherein the molding part comprises a straight barrel section part and a conical surface section part, and the surface roughness of the molding part and the conical surface section part is detected, and the specific detection results are shown in the following table 1:

table 1 surface roughness measurements of samples spun from examples and comparative examples

As shown in fig. 15 and 16, which are samples produced in batch by using example 1, fig. 15 is a drawing obtained by spinning a combination of effective spinning curved surface portions of a spinning roller having a smaller radius of curvature than that of effective spinning curved surface portions of a spinning block, and it can be seen from the drawing that the problem of the uneven finish and the step occurs at the root portion of the straight barrel section; while fig. 16 shows that the spinning is performed by using a combination of the effective spinning curved surface portion of the spinning roller having a radius of curvature equal to or larger than that of the effective spinning curved surface portion of the spinning block, which is equal in this embodiment, it can be found that the root portion of the straight section and the surface of the main body portion are smooth and tidy enough, and no step problem occurs.

The appearance of the samples formed by the above examples and comparative examples was judged by naked eyes, and for the appearance description, the structures shown in fig. 15 and 16 described above showed bright surfaces without peeling, fuzzing and cracking, as indicated by the arrows in fig. 17, the cracks were generated, i.e., the texture intersecting the spinning lines arranged in the circumferential direction was produced, while the surfaces to be processed were shown in fig. 18 and 19, the positions indicated by the arrows in fig. 20 and the circles in fig. 21 were the peeling problems, i.e., the copper chips were adhered to the copper tube surface and were not easily removed, and the appearance and the processing quality of the specific products were as shown in table 2 below:

table 2 appearance of the spin-processed samples of examples and comparative examples

For the extrusion life of the examples of the different combinations, specifically the number of spun-out samples (times), the statistics are shown in table 3 below:

table 3 extrusion life evaluation of examples

The following rules can be found from the above table: (1) As long as the product is matched with the 'beads', the surface of the product is easy to be fluffed, skinned, cracked and cracked in the later period of use, and the 'beads' are not durable. And (2) adopting 3 rollers, and enabling the surface of the product to be easily fluffed and skinned. (3) The surface of the product produced by the spinning block is bright, and the phenomena of peeling, cracking and threading are avoided, but the service life of the product is far less than that of the product matched with other extrusion parts when the product is the spinning block. (4) The surface of the manufactured product is bright, and the phenomena of peeling, cracking and threading are avoided, namely the finished product is qualified and only by matching at least 1 hard friction type extrusion piece with 1-2 rolling type extrusion pieces; wherein, the best combination of the 2 rollers and the 1 spinning block and the one roller and the 1 spinning block is that the surface of the manufactured product is bright, and the phenomena of peeling, cracking and threading are avoided. By combining the working characteristics of mass-produced samples and two tools and dies, the problems of low purity, high impurity content, higher hardness than a semi-hard state, difficult release and continuous accumulation of heat generated by friction due to higher spinning speed and easy copper heating, fuzzing, peeling and the like of a hard copper pipe can be found, and the service life of an extrusion piece can be shortened if a plurality of claws are spun by adopting a hard friction tool; spinning is carried out by adopting spinning balls, the processing quality is good in the early stage, fuzzing, skinning and cracking are easy to occur along with the abrasion of the balls, and the service life of the extrusion piece is shorter; in addition, in order to avoid heat accumulation, cooling is usually performed by adopting a cooling liquid, but because copper contains more impurities, fuzzing and skinning are easily caused when the cooling liquid is added; by adopting three rollers, the product is easy to fuzzing and skinning, and the appearance of the semi-hard copper tube and the hard copper tube is easy to fuzzing and skinning, although the heat dissipation performance is good. In the application, the rolling type and the hard friction type are combined and matched, so that a better effect, especially a spinning roller, can be achieved.

In the embodiment, the rotary driving device drives the clamping claw to drive the copper pipe to rotate, and the extrusion piece only performs extrusion feeding; in addition, the gripper may be held stationary while the pressing member is driven to rotate about the rotation center axis by a rotation driving device, for example, a structure similar to that disclosed in patent document CN108080480a may be adopted. In addition, in the above-described embodiment, the pressing member is mounted and fixed by the swinging rod, so that the rod-like structure thereof can be used with less interference during the spinning process; further, the structure of the spinning feed drive device is not limited to the swing type feed mechanism in the above embodiment, but may be a radial feed mechanism such as CN108080480a, which is also possible to mount the pressing member using a rod-like connecting member, that is, in the present invention, it is preferable to mount the pressing member using a rod-like connecting member, thereby constituting a connecting member of the pressing member and the pressing feed drive device. In addition, in the above embodiments, the extrusion members are all necked extrusion members, and the combination can also be used for flared extrusion members, thereby improving the spin forming of products having similar characteristics such as hard copper tubes.

Claims

1. The necking multi-jaw spinning machine head comprises a mounting sliding plate, a linear displacement output device, an extrusion part group and an extrusion driving device for driving the extrusion part group to perform extrusion action, wherein the extrusion part group comprises more than two extrusion parts; the extrusion driving device is arranged on the installation sliding plate, and the linear displacement output device is used for driving the installation sliding plate to reciprocate;

the method is characterized in that:

the extrusion part group is composed of more than one rolling necking extrusion part and more than one hard friction tool necking extrusion part.

2. The necked down multi-jaw spinning head of claim 1, wherein:

the multi-claw spinning machine head is a three-claw spinning machine head;

the extrusion part group consists of two rolling necking extrusion parts and a necking extrusion part of a hard friction tool.

3. The necked down multi-jaw spinning head of claim 1 or 2, wherein:

4. The necked down multi-jaw spinning head of claim 1, wherein:

the rolling necking extrusion part is a rotary wheel type extrusion part;

the effective extrusion surface of the necking extrusion part of the hard friction tool is a smooth curved surface which is convex and continuous.

5. The necked down multi-jaw spinning head of claim 4, wherein:

the radius of curvature of the effective spinning curvature of the necking extrusion of the hard friction tool is equal to or smaller than that of the effective spinning curvature of the spinning wheel extrusion.

6. The necked down multi-jaw spinning head of claim 1 or 4, wherein:

the extrusions in the extrusion group are uniformly distributed around the rotation central axis, and the core rods are distributed at the central position.

7. The necked down multi-jaw spinning head of claim 1 or 4, wherein:

the necking extrusion piece of the hard friction tool is a spinning block made of die steel; performing CVD treatment on at least the effective extrusion surface of the spinning block;

the rolling necking extrusion part is a rotary pressing wheel made of die steel.