Variable diameter spinning device with convenient blank dismounting

Abstract

The application discloses a variable-diameter spinning device convenient for blank dismounting, and relates to the technical field of metal spinning forming, which comprises a mandrel, one end of which is arranged on a limiting plate in an axial rotation mode, the other end of which is arranged on a fixed die seat in an axial rotation mode, and the fixed die seat is installed on a spinning machine; a supporting die set is arranged outside the mandrel and is in transmission connection with the mandrel, and the supporting die set is used for supporting a workpiece; when the mandrel rotates, the supporting die set expands or shrinks along the radial direction of the mandrel, and the outer diameter of the supporting die set correspondingly increases or decreases. The workpiece is supported by the supporting die set; when the mandrel rotates, the supporting die set expands or shrinks along the radial direction of the mandrel, and the outer diameter of the supporting die set correspondingly increases or decreases. After the workpiece is spun and formed, the supporting die set can be shrunk, so that the supporting die set is separated from the workpiece, the blank is convenient to dismount, and the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of metal spinning, in particular to a variable diameter spinning device which is convenient for disassembly and assembly of blanks. Background Art

[0002] Metal spinning technology is a chipless processing technology that applies external force to a rotating blank to cause it to produce continuous local plastic deformation, ultimately obtaining thin-walled hollow rotating parts. It is widely used in aerospace, weapons and ships, transportation, petrochemicals and other fields.

[0003] Composite tubes can be formed by metal spinning. After the composite tube is formed, the product diameter is small, and the mold and the blank will fit tightly together and cannot be separated directly. They must be removed together and then separated.

[0004] In addition, for spinning with internal ribs, the diameter of the tubular blank at the formed transverse and longitudinal ribs is usually smaller than the diameter of the spinning die. Therefore, when unloading, the tubular blank and the spinning die need to be removed and separated together, and the spinning die must be reinstalled before the next tubular blank can be loaded, which reduces production efficiency.

[0005] In view of this, how to provide a device that can facilitate the disassembly and assembly of blanks and improve production efficiency is a problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0006] The purpose of the present invention is to provide a variable diameter spinning device which is convenient for disassembly and assembly of blanks, so as to solve the problems existing in the prior art.

[0007] To achieve the above-mentioned object, the present invention provides a variable diameter spinning device that facilitates the disassembly and assembly of blanks, comprising:

[0008] A core shaft, one end of which is axially rotatable on a limit plate, and the other end of which is axially rotatable on a fixed die base, wherein the fixed die base is mounted on the spinning machine;

[0009] The support module is arranged on the outside of the core shaft and is connected to the core shaft in a transmission manner. The support module is used to support the workpiece. When the core shaft rotates, the support module expands or contracts along the radial direction of the core shaft, and the outer diameter of the support module increases or decreases accordingly.

[0010] Furthermore, the support module includes:

[0011] A plurality of driven modules are fan-shaped structures for supporting workpieces, and mounting gaps are formed between adjacent driven modules. The mounting gaps are arranged along the radial direction of the core shaft, and the width of the mounting gaps gradually increases from the outside to the inside;

[0012] The active module is arranged in the installation gap and adapted to the shape of the installation gap, and the active module supports the driven module; the core shaft is transmission-connected to the active module, and when the core shaft rotates, the active module moves radially along the core shaft; when the active module approaches the core shaft, the driven module contracts inward, the installation gap between adjacent driven modules becomes narrower, and the outer diameter of the driven module decreases; when the active module moves away from the core shaft, the driven module opens outward, the installation gap between adjacent driven modules becomes widened, and the outer diameter of the driven module increases.

[0013] Furthermore, the installation gap is trapezoidal, and a connecting portion that matches the shape of the installation gap is provided on the top of the active module.

[0014] Furthermore, the active module includes:

[0015] A crank, wherein a cylinder is provided on the end surface of the other end of the core shaft, and one end of the crank is hinged to the cylinder;

[0016] a connecting rod, hinged to the other end of the crank, the connecting rod being connected to the active module;

[0017] The first guide block is arranged on the active die set, and the fixed die base is correspondingly provided with a first guide groove. The first guide block is arranged in the first guide groove to slide radially along the core shaft; when the core shaft rotates, the active die set is driven to move radially along the core shaft through the crank and the connecting rod.

[0018] Furthermore, the core shaft is provided with a mounting groove corresponding to the active module, and when the active module approaches the core shaft, the active module enters the mounting groove.

[0019] Furthermore, it also includes:

[0020] The second guide block is arranged on the driven die set, and the fixed die base is correspondingly provided with a second guide groove. The second guide block is slidably arranged in the second guide groove along the radial direction of the core shaft.

[0021] Furthermore, it also includes:

[0022] A spring is arranged on the outer surface of the driven module, one end of the spring is connected to the driven module, and the other end is connected to the fixed module base; the spring has an elastic tendency to squeeze the driven module inward along the axial direction of the core shaft.

[0023] Furthermore, it also includes:

[0024] The workpiece is provided with a connecting hole corresponding to the fastening threaded hole, and the fastening bolt is inserted into the connecting hole and the fastening threaded hole to fix the workpiece on the driven module.

[0025] Furthermore, both ends of the core shaft are rotatably arranged on the limit plate and the fixed mold base through thrust bearings, and a limit nut is arranged on the outer side of the thrust bearing.

[0026] Furthermore, it also includes: an end cover, which is arranged on the outer side of the limiting plate.

[0027] The present invention discloses the following technical effects:

[0028] 1. This application utilizes a support module to support the workpiece. As the spindle rotates, the support module expands or contracts radially along the spindle, correspondingly increasing or decreasing the outer diameter of the support module. After the workpiece is spin-formed, the support module can be retracted to separate it from the workpiece, facilitating blank assembly and disassembly and improving production efficiency.

[0029] 2. The support module consists of a driving module and a driven module. The driven module is supported by the driving module and located in the installation gap between adjacent driven modules. When the mandrel rotates, the driving module moves radially along the mandrel. When the driving module approaches the mandrel, the driven module contracts inward, narrowing the installation gap between adjacent driven modules and reducing the outer diameter of the driven module. When the driving module moves away from the mandrel, the driven module opens outward, widening the installation gap between adjacent driven modules and increasing the outer diameter of the driven module. In other words, the outer diameter of the support module can be adjusted by rotating the mandrel, allowing for quick separation of the support module and the workpiece, facilitating assembly and disassembly of the blank.

[0030] 3. The fixed mold base is provided with a first guide groove and a second guide groove, which can guide and limit the moving direction of the active module and the driven module, thereby improving the movement accuracy and stability of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 It is a schematic diagram of the structure of the present invention;

[0033] Figure 2 This is a schematic diagram of the structure after the fixed mold base and end cover are removed;

[0034] Figure 3 It is a cross-sectional view of the structure of the present invention;

[0035] Figure 4 for Figure 3 AA direction cross-sectional diagram;

[0036] Figure 5 Schematic diagram of the core shaft structure;

[0037] Figure 6 Open the state diagram for the support module;

[0038] Figure 7 This is a diagram of the support module in contraction state;

[0039] Figure 8 Schematic diagram of the limiting plate structure;

[0040] Figure 9 Schematic diagram of the fixed mold base structure;

[0041] Among them, 1. Fixed mold base; 2. Core shaft; 3. Thrust bearing; 4. Limit nut; 5. Limit plate; 6. Connecting rod; 7. Crank; 8. Active module; 9. Driven module; 10. Spring; 11. End cover. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0043] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] like Figures 1-9 As shown, the present invention provides a variable diameter spinning device that is convenient for disassembly and assembly of blanks, comprising:

[0045] The core shaft 2 has one end rotatably arranged on the limit plate 5 along the axial direction, and the other end rotatably arranged on the fixed die base 1 along the axial direction. The fixed die base 1 is installed on the spinning machine through a threaded connection;

[0046] The support module is located outside of and in driving connection with the mandrel 2. It supports the workpiece. The mandrel 2 is rotated by an external drive mechanism. The specific drive mechanism can be selected from existing equipment and will not be described in detail here. As the mandrel 2 rotates, the support module expands or contracts radially along the mandrel 2, and the outer diameter of the support module increases or decreases accordingly.

[0047] In this embodiment, the support module includes:

[0048] Multiple driven modules 9 are fan-shaped structures for supporting the workpiece. In this embodiment, there are three sets of driven modules 9. An installation gap is formed between adjacent driven modules 9. The installation gap is arranged along the radial direction of the core shaft 2, and the width of the installation gap gradually increases from the outside to the inside.

[0049] There are three groups of active modules 8 corresponding to the passive modules 9. Each active module 8 is arranged in the installation gap and adapted to the shape of the installation gap. The active module 8 supports the passive module 9. The core shaft 2 is transmission-connected to the active module 8. When the core shaft 2 rotates, the active module 8 moves radially along the core shaft 2. When the active module 8 approaches the core shaft 2, the passive module 9 contracts inward, the installation gap between adjacent passive modules 9 becomes narrower, and the outer diameter of the passive module 9 decreases. When the active module 8 moves away from the core shaft 2, the passive module 9 opens outward, the installation gap between adjacent passive modules 9 becomes widened, and the outer diameter of the passive module 9 increases.

[0050] In this embodiment, the installation gap is trapezoidal, and a connecting portion that matches the shape of the installation gap is provided on the top of the active module 8 .

[0051] In this embodiment, the active module 8 includes:

[0052] Crank 7, a cylinder is provided on the end surface of the other end of the core shaft 2, and one end of the crank 7 is hinged to the cylinder;

[0053] The connecting rod 6 is hinged to the other end of the crank 7. The active module 8 is provided with an oblong hole corresponding to the connecting rod 6. The connecting rod 6 is inserted into the oblong hole and connected to the active module 8.

[0054] The first guide block is arranged on the active module 8, and the fixed mold base 1 is correspondingly provided with a first guide groove. The first guide block is set in the first guide groove for radial sliding along the core shaft 2; when the core shaft 2 rotates, the active module 8 is driven to move radially along the core shaft 2 through the crank 7 and the connecting rod 6.

[0055] In this embodiment, the core shaft 2 is provided with a mounting groove corresponding to the active module 8 . When the active module 8 approaches the core shaft 2 , the active module 8 enters the mounting groove.

[0056] In this embodiment, it also includes:

[0057] The second guide block is provided on the driven die set 9 , and the fixed die base 1 is correspondingly provided with a second guide groove. The second guide block is slidably provided in the radial direction of the core shaft 2 in the second guide groove.

[0058] In this embodiment, it also includes:

[0059] Spring 10, a waist hole is set on the outer surface of the driven module 9, and the spring 10 is set at the waist hole. One end of the spring 10 is connected to the driven module 9, and the other end is connected to the fixed mold base 1; the spring 10 has an elastic tendency to squeeze the driven module 9 inward along the axial direction of the core shaft 2.

[0060] Since the width of the installation gap gradually increases from the outside to the inside, the active module 8 is arranged in the installation gap and is adapted to the shape of the installation gap. Therefore, the active module 8 can support the driven module 9 from the inside to the outside, but the outside of the driven module 9 has no unlimited position structure. The purpose of setting the spring 10 in this application is to provide a pre-tightening force from the outside to the inside for the driven module 9, to prevent the driven module 9 from separating from the active module 8 during the opening or contraction process, and to help the driven module 9 move from the outside to the inside. It should be noted that the elastic force of the spring 10 does not affect the opening or contraction of the driven module 9.

[0061] In this embodiment, it also includes:

[0062] The workpiece is provided with a connecting hole corresponding to the fastening threaded hole, and the fastening bolt is inserted into the connecting hole and the fastening threaded hole to fix the workpiece on the driven module 9 to prevent the workpiece from rotating.

[0063] In this embodiment, both ends of the core shaft 2 are rotatably disposed on the limiting plate 5 and the fixed mold base 1 through the thrust bearing 3 , and a limiting nut 4 is disposed outside the thrust bearing 3 .

[0064] In this embodiment, the device further includes an end cover 11 , which is arranged on the outer side of the limiting plate 5 .

[0065] The specific working process is as follows:

[0066] Fix the fixed die base 1 on the spinning machine, spray boron nitride spray on the outer surface of the spinning die to reduce the friction between the workpiece and the spinning die, and install the workpiece on the driven die assembly 9.

[0067] An external drive mechanism rotates the mandrel 2 (forward). This rotation drives the active die 8, which moves radially outward along the mandrel 2 via the crank 7 and connecting rod 6. The active die 8 lifts the passive die 9, causing it to reach a preset outer diameter. The workpiece and the passive die 9 are then secured together by tightening bolts and spinning is performed. During the spinning process, the reduction rate per pass is 20% to 25%, the spindle speed is 300 rpm, and the feed ratio is 0.2 to 0.5 mm / r. Spinning of the workpiece is achieved through the rotation of the spindle and the extrusion of the spinning wheel.

[0068] After spinning, the fastening bolts are removed, and the external driving mechanism drives the core shaft 2 to rotate (reverse). The core shaft 2 rotates and drives the active module 8 to move from the outside to the inside along the radial direction of the core shaft 2 through the crank 7 and the connecting rod 6. The active module 8 enters the mounting groove on the core shaft 2. As the active module 8 moves inward, the driven module 9 loses support and shrinks. The shrinkage direction is guided by the second guide groove, and the spring 10 can also play a boosting role. Therefore, the active module 8 and the driven module 9 move inward synchronously, and the outer diameter of the driven module 9 is reduced and separated from the workpiece after spinning.

[0069] Remove the workpiece and proceed to spin forming the next workpiece.

[0070] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0071] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A variable diameter spinning device that is convenient for disassembly and assembly of blanks, characterized in that: include: A core shaft (2) has one end rotatably disposed on a limit plate (5) along the axial direction, and the other end rotatably disposed on a fixed die base (1) along the axial direction, wherein the fixed die base (1) is mounted on a spinning machine; A support module is arranged on the outside of the core shaft (2) and is in driving connection with the core shaft (2), the support module is used to support the workpiece, and when the core shaft (2) rotates, the support module expands or contracts along the radial direction of the core shaft (2), and the outer diameter of the support module increases or decreases accordingly; The support module comprises: A plurality of driven modules (9) are fan-shaped structures for supporting workpieces, and mounting gaps are formed between adjacent driven modules (9), the mounting gaps are arranged along the radial direction of the core shaft (2), and the width of the mounting gaps gradually increases from the outside to the inside; The active module (8) is arranged in the installation gap and is adapted to the shape of the installation gap, and the active module (8) supports the driven module (9); the core shaft (2) is transmission-connected to the active module (8), and when the core shaft (2) rotates, the active module (8) moves radially along the core shaft (2); when the active module (8) approaches the core shaft (2), the driven module (9) contracts inward, the installation gap between adjacent driven modules (9) becomes narrower, and the outer diameter of the driven module (9) decreases; when the active module (8) moves away from the core shaft (2), the driven module (9) opens outward, the installation gap between adjacent driven modules (9) becomes wider, and the outer diameter of the driven module (9) increases; the installation gap is trapezoidal, and a connecting portion adapted to the shape of the installation gap is provided at the top of the active module (8); Also includes: A crank (7), wherein a cylinder is provided on the end surface of the other end of the core shaft (2), and one end of the crank (7) is hinged to the cylinder; A connecting rod (6) is hinged to the other end of the crank (7), and the connecting rod (6) is connected to the active module (8); A first guide block is provided on the active module (8), and the fixed die base (1) is provided with a first guide groove corresponding thereto. The first guide block is provided in the first guide groove so as to slide radially along the core shaft (2). When the core shaft (2) rotates, the active module (8) is driven to move radially along the core shaft (2) via the crank (7) and the connecting rod (6). The core shaft (2) is provided with a mounting groove corresponding to the active module (8), and when the active module (8) approaches the core shaft (2), the active module (8) enters the mounting groove. A second guide block is provided on the driven die set (9), the fixed die base (1) is correspondingly provided with a second guide groove, and the second guide block is slidably provided in the radial direction of the core shaft (2) in the second guide groove; A spring (10) is provided on the outer surface of the driven module (9), one end of the spring (10) is connected to the driven module (9), and the other end is connected to the fixed module base (1); the spring (10) has an elastic tendency to squeeze the driven module (9) inward along the axial direction of the core shaft (2); Also includes: A fastening threaded hole is provided on the workpiece, and a connecting hole is provided corresponding to the fastening threaded hole. A fastening bolt is inserted into the connecting hole and the fastening threaded hole to fix the workpiece on the driven module (9); both ends of the core shaft (2) are rotatably arranged on the limit plate (5) and the fixed die base (1) through a thrust bearing (3), and a limit nut (4) is provided on the outer side of the thrust bearing (3); The end cover (11) is arranged on the outer side of the limiting plate (5).

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