Multi-roller surrounding high-precision seamless tapered tube forming roller die

Abstract

The present invention discloses a multi-roller surrounding high-precision seamless tapered tube forming roller die, comprising a plurality of forming modules (1) arranged in sequence along the axis of the tube to be processed, each forming module (1) comprising three roller die bodies (11) radially distributed around the axis, the roller die body (11) being fixed on a die frame (2), the roller die body (11) being provided with forming grooves on its circumference, the forming grooves of the three roller die bodies (11) being matched to form a fully circular cold pressing die opening, and as the three roller die bodies (11) rotate synchronously, the diameter of the formed cold pressing die opening gradually increases or decreases. The present invention has the advantages of being able to process millimeter-level capillary flexible seamless tapered tubes, and enabling the capillary flexible seamless tapered tubes to meet industrial production requirements in terms of processing qualification rate and processing precision.

Description

Technical Field

[0001] The invention relates to the technical field of cone tube forming, in particular to a multi-roller surrounding high-precision seamless cone tube forming roller die. Background Art

[0002] Conical tubes are needed in the fields of petroleum, chemical industry, medical treatment, fire protection, electric power, mechanical equipment, logistics equipment, shipbuilding, construction, instrumentation, plumbing appliances, military and other fields. Since the main raw material of conical tubes is carbon steel, various materials such as stainless steel and alloy steel can also be used to obtain conical tubes with different properties. The traditional hot push forming method will cause irreversible changes in the internal molecular structure of the processed material, causing the processed conical tube to lose the performance of the material itself. Therefore, for some use environments with high material requirements, cold pressing has become the mainstream of conical tube processing.

[0003] For the cold forming of conical tubes, rolling processing has gradually replaced extrusion processing and become the mainstream of modern conical tube cold forming due to its advantages such as being able to process tubes of various sizes and having a low probability of tube bursting during processing. For rolling processing, mold design is a major difficulty in processing. In the patent application CN 110303064 A applied for and published by our company, a roller die for continuous cold forming of conical tubes has been disclosed. The roller die comprises a pair of roller die bodies with identical structures and tangential outer circles. When the two roller die bodies are matched, an effective cold pressing zone with a full-circle die opening is formed at the tangent point. As the pair of roller die bodies rotate synchronously in opposite directions, the diameter of the formed full-circle die opening gradually increases or decreases.

[0004] The mold in the above patent is mainly used in actual applications to process larger conical tubes. However, when it comes to more precise capillary flexible seamless conical tubes for medical devices, instruments and meters and other specific requirements, their outer diameters are generally 2.5-6.5mm. The mold in the above patent cannot process such millimeter-level conical tubes. Even if the above mold is scaled proportionally, the accuracy and success rate of its conical tube processing cannot meet production requirements, and the processing cost of a single capillary flexible seamless conical tube is also very high.

[0005] Therefore, the existing cone tube forming mold cannot be used well for processing millimeter-level capillary flexible seamless cone tubes. The capillary flexible seamless cone tubes cannot meet the production requirements in terms of processing qualification rate and processing accuracy. A new high-precision seamless cone tube forming roller mold is urgently needed to meet the market demand for capillary flexible seamless cone tubes. Summary of the Invention

[0006] The present invention aims to provide a multi-roller surrounding high-precision seamless tapered tube forming roller die, which has the advantages of being able to process millimeter-level capillary flexible seamless tapered tubes, ensuring that the processing qualification rate and processing accuracy of the capillary flexible seamless tapered tubes meet industrial production requirements.

[0007] The technical solution of the present invention is a multi-roller surrounding high-precision seamless tapered tube forming roller die, which includes several groups of forming modules arranged in sequence along the axis direction of the tube to be processed, and each group of forming modules includes three roller die bodies distributed radially around the axis. The roller die body is fixed on the die frame, and a forming groove is provided on the circumference of the roller die body. The forming grooves of the three roller die bodies cooperate to form a fully circular cold pressing die mouth, and as the three roller die bodies rotate synchronously, the diameter of the formed cold pressing die mouth gradually increases or decreases.

[0008] In the aforementioned multi-roller surrounding high-precision seamless conical tube forming roller die, in the two adjacent groups of forming modules along the linear movement direction of the conical tube, the minimum cold pressing die opening diameter of the front group of forming modules is larger than the minimum cold pressing die opening diameter of the rear group of forming modules and smaller than the maximum cold pressing die opening diameter of the rear group of forming modules.

[0009] In the aforementioned multi-roller surrounding high-precision seamless conical tube forming roller die, an axial hole is provided at the center of the roller die body, and the roller die body is installed through the shaft.

[0010] In the aforementioned multi-roller surrounding high-precision seamless conical tube forming roller die, the effective working length of the forming groove is 1 / 2-3 / 4 of the circumference of the circle on which it is located.

[0011] In the aforementioned multi-roller surrounding high-precision seamless conical tube forming roller die, the die frame includes several triangular prism-shaped inner cores connected end to end, and a through hole matching the seamless conical tube to be produced is provided on the center line of the inner core. Covers are provided on the three side surfaces of the inner core respectively. When the side surfaces of the inner core cooperate with the corresponding covers, an accommodating space for the roller die body to be embedded is formed inside. The matching body of several inner cores and all the covers is covered with a cylindrical outer shell.

[0012] In the aforementioned multi-roller surrounding high-precision seamless conical tube forming roller die, limit blocks are provided at both ends of the cylindrical shell.

[0013] Compared with the prior art, the cone tube forming roller die of the present invention includes several groups of forming modules arranged in sequence along the axis direction of the pipe to be processed, and each group of forming modules includes three roller die bodies distributed radially around the axis. Since the pipe to be processed is rotating and feeding linearly, the annular distribution design of the roller die body around a circle is compared with the existing pairing pattern design, so that when the pipe contacts the roller die body, the force is dispersed to three different roller die bodies. The three different roller die bodies can simultaneously give the pipe a reaction force to perform rolling forming processing on it. The reaction force is more dispersed and uniform, and a cone tube with higher processing precision is obtained, which can be used to process millimeter-level capillary flexible seamless cone tubes. Since each group of forming modules of the present invention is composed of three roller die bodies distributed annularly around the pipeline, the increase in the number of roller die bodies also makes its own fault tolerance higher, so that the capillary flexible seamless cone tube can meet the industrial production requirements in terms of processing qualification rate and processing precision. The use of the mold of the present invention to process capillary flexible seamless cone tubes also greatly reduces the manufacturing cost of capillary flexible seamless cone tubes.

[0014] Furthermore, in the two adjacent groups of forming modules along the linear movement direction of the conical tube, the minimum cold pressing die diameter of the front group of forming modules is larger than the minimum cold pressing die diameter of the rear group of forming modules and smaller than the maximum cold pressing die diameter of the rear group of forming modules. This size design enables the present invention to complete the continuous forming process of the conical tube of the required length under ideal conditions by simply adjusting the number of forming module groups.

[0015] Furthermore, the effective working length of the forming groove of the roller die body of the present invention is 1 / 2-3 / 4 of the circumference of the circle on which it is located. Reasonable use of the working area on the roller die body can effectively prevent interference between the roller die body and the pipe during rolling processing; the roller die body of the present invention is installed on a mold frame, and the mold frame includes a plurality of triangular prism-shaped inner cores connected end to end. A through hole matching the seamless tapered tube produced is provided on the center line of the inner core, and corresponding covers are provided on the three side faces of the inner core. After the side faces of the inner core cooperate with the corresponding covers, an accommodating space for the roller die body to be embedded is formed inside. The mold frame is tailored for the roller die body, so that the three roller die bodies can maintain a stable relative position to each other, providing a basic guarantee for the tapered tube forming process.

[0016] In summary, the present invention has the advantages of being able to be used to process millimeter-level capillary flexible seamless conical tubes, and ensuring that the processing qualification rate and processing accuracy of the capillary flexible seamless conical tubes meet industrial production requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 It is a structural diagram of the forming module;

[0019] Figure 3 It is a structural diagram of the inner core;

[0020] Figure 4 1 is a schematic structural diagram of the cover;

[0021] Figure 5 It is a schematic diagram of the three-dimensional structure of the cylindrical shell;

[0022] Figure 6 is a schematic diagram of the cross-sectional structure of the cylindrical shell;

[0023] Figure 7 It is a schematic diagram of the installation status of the molding module in the mold frame.

[0024] Reference numerals: 1 - forming module, 2 - mold frame, 11 - roller mold body, 21 - inner core, 22 - cover, 23 - cylindrical shell, 24 - limit block, 25 - through hole. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the accompanying drawings and examples, but they are not intended to limit the present invention.

[0026] Example: Multi-roller surrounding high-precision seamless tapered tube forming roller die is mainly used for processing capillary flexible seamless tapered tubes with an outer diameter of 2.5-6.5mm. The structure is as follows: Figures 1 to 7 As shown, it includes several groups of forming modules 1 arranged in sequence along the axis direction of the pipe to be processed. Each group of forming modules 1 includes three roller mold bodies 11 radially distributed around the axis. The roller mold body 11 is fixed on the mold frame 2. A circle of forming grooves is provided on the circumference of the roller mold body 11. The forming grooves of the three roller mold bodies 11 cooperate to form a fully circular cold pressing die opening, and as the three roller mold bodies 11 rotate synchronously, the diameter of the formed cold pressing die opening gradually increases or decreases.

[0027] In actual application, since the capillary flexible seamless conical tube does not need to be too long when used, the number of groups of forming modules 1 in this embodiment is 4 groups, which can meet production needs; in the two adjacent groups of forming modules 1 along the linear movement direction of the conical tube, the minimum cold pressing die diameter of the front group forming module 1 is greater than the minimum cold pressing die diameter of the rear group forming module 1 and smaller than the maximum cold pressing die diameter of the rear group forming module 1, that is, each roller mold body 11 of the present invention is designed in size so that the circular cold pressing die diameters formed by the front and rear groups of forming modules 1 have overlapping parts, so as to perform multi-stage alternating continuous cold pressing forming of seamless conical tubes.

[0028] An axial hole is provided in the center of the roller die body 11, and the roller die body 11 is installed through the shaft; the effective working length of the forming groove is 1 / 2-3 / 4 of the circumference of the circle on which it is located, which reasonably utilizes the working area on the roller die body 11 and can effectively prevent interference between the roller die body 11 and the pipe during the rolling process.

[0029] The mold frame 2 of the present invention includes several triangular prism-shaped inner cores 21 connected end to end. A through hole 25 matching the seamless tapered tube to be produced is provided on the center line of the inner core 21. Covers 22 are provided on the three side surfaces of the inner core 21. After the side surfaces of the inner core 21 cooperate with the corresponding covers 22, an accommodating space for the roller mold body 11 to be embedded is formed inside. The accommodating space is slightly larger than the size of the roller mold body 11, so that the roller mold body 11 has a certain adjustment space in the radial direction after being installed. A cylindrical outer shell 23 is covered on the outside of the matching bodies of several inner cores 21 and all the covers 22, and all the matching bodies of the covers 22 and the inner cores 21 are sealed and fixed for radial limitation. Limit blocks 24 are provided at both ends of the cylindrical outer shell 23 for axial limitation. The mold frame 2 is tailored for the roller mold body 11, so that the three roller mold bodies 11 can maintain a stable relative position to each other, providing a basic guarantee for the tapered tube forming process.

[0030] The working principle of the present invention: When the present invention works, it needs to be driven by a power source to perform linear reciprocating motion. The forming modules 1 of the present invention are arranged in sequence from large to small according to the maximum cold pressing die diameter. A core rod is inserted into the inside of the equal-diameter straight tube to be processed as an inner mold. The equal-diameter straight tube and the core rod are fed synchronously into the forming module 1 to drive each roller mold body 11 to rotate. The rotating roller mold body 11 simultaneously gives the equal-diameter straight tube a reaction force to perform continuous rolling-type forming processing on it, and processes it into a seamless conical tube.

[0031] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

Claims

1. Multi-roller surrounding high-precision seamless tapered tube forming roller die, characterized by: The invention comprises a plurality of forming modules (1) arranged in sequence along the axis direction of the pipe to be processed, each forming module (1) comprises three roller die bodies (11) radially distributed around the axis, the roller die body (11) being fixed on a die frame (2), a forming groove being provided on the circumference of the roller die body (11), the effective working length of the forming groove being 1 / 2-3 / 4 of the circumference of the circle where the forming groove is located, the forming grooves of the three roller die bodies (11) cooperate to form a full circular cold pressing die opening, and as the three roller die bodies (11) rotate synchronously, the diameter of the formed cold pressing die opening gradually increases or decreases; In two adjacent groups of forming modules (1) along the linear motion direction of the conical tube, the minimum cold pressing die diameter of the front group forming module (1) is larger than the minimum cold pressing die diameter of the rear group forming module (1) and smaller than the maximum cold pressing die diameter of the rear group forming module (1); The mold frame (2) includes a plurality of triangular prism-shaped inner cores (21) connected end to end. A through hole (25) matching the seamless conical tube to be produced is provided on the center line of the inner core (21). Covers (22) are provided on the three side surfaces of the inner core (21). When the side surfaces of the inner core (21) are matched with the corresponding covers (22), a receiving space for the roller mold body (11) to be embedded is formed inside. The outer surface of the matching body of the plurality of inner cores (21) and all the covers (22) is covered with a cylindrical outer shell (23).

2. The multi-roller surrounding high-precision seamless tapered tube forming roller die according to claim 1, characterized in that: An axial hole is provided at the center of the roller mold body (11), and the roller mold body (11) is mounted via the shaft.

3. The multi-roller surrounding high-precision seamless tapered tube forming roller die according to claim 1 or 2, characterized in that: Limit blocks (24) are provided at both ends of the cylindrical housing (23).

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