Hat body workpiece stretch spinning process and stretch spinning combined equipment

Abstract

This invention discloses a stretching and spinning process for cap body workpieces and a combined stretching and spinning equipment. First, a cap body workpiece blank is fabricated. Then, an inner lining fixture is used to line the main body of the cap body workpiece blank, and the blank is rotated. A spinning assembly is used to radially fit and narrow the end of the main body ...

Description

Technical Field

[0001] This invention relates to the stretching and spinning process of hat body workpieces and the combined stretching and spinning equipment, belonging to the technical field of stretching and spinning forming of hat body workpieces. Background Technology

[0002] In industrial production processes, stretching operations are frequently involved in pipe production, which involves thinning the pipe wall to meet the requirements for thinner pipe wall forming.

[0003] Current pipe thinning processes generally employ spinning. Spinning involves fixing a flat or hollow blank onto a die in a spinning machine. While the blank rotates with the machine spindle, pressure is applied to the blank using spinning wheels or rollers, causing localized plastic deformation. Spinning is a specialized forming method. It can be used to perform stretching, flanging, necking, bulging, and curling of various shapes of rotating bodies.

[0004] There is currently a type of cap body workpiece, which includes a tube body with a sealed end and a ring edge set on one side of the open end of the tube body. Since the wall thickness of the tube body is required to be thin, not exceeding 0.5mm, it is difficult to achieve direct stamping on sheet material.

[0005] Generally, two methods are used for forming. The first method is to manufacture the main body and the ring edge of the sleeve separately and then weld them together. This method has weld seams, which will greatly affect the structural strength and service life. The second method is to use spinning, that is, after making the cap body workpiece, the wall of the sleeve body is spun and stretched to make its wall thickness thinner.

[0006] Traditional spinning equipment uses a single spinning head or multiple spinning heads in combination. It is difficult to guarantee the accuracy of the product when operating a single spinning head. When multiple spinning heads work in sync, due to the initial tolerance of the workpiece, the initial tolerance will cause a certain concentricity deviation when the multiple spinning heads move at the same height after synchronous spinning. This will greatly affect the uniformity of the wall thickness, requiring secondary milling and grinding in the later stage. The product qualification rate is uncontrollable, and the scrap rate remains high. Summary of the Invention

[0007] The purpose of this invention is to address the shortcomings of the prior art and to solve the problem of poor uniformity of pipe wall thickness caused by the difficulty in controlling the concentricity of the spinning process in traditional stretching and spinning operations. This invention proposes a stretching and spinning process for cap-shaped workpieces and a combined stretching and spinning equipment.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] The cap body workpiece stretching and spinning process, wherein the cap body workpiece includes a sleeve body having a sealed end and a ring edge disposed on one side of the open end of the sleeve body, includes the following steps:

[0010] S1 is used to fabricate the blank of the hat body workpiece;

[0011] S2 shrinking and bonding: The inner lining fixture is used to line the tube body of the cap workpiece blank and rotate it. The spinning component is used to radially bond and shrink one side of the sealing end of the tube body to form a shrinking end, so that the inner wall of the shrinking end is bonded to the inner lining fixture.

[0012] S3 stretch spinning: the inner lining fixture drives the cap body workpiece blank to rotate, and the spinning assembly performs stretch spinning operation on the tube sleeve body from the constricted end to the open end.

[0013] Preferably, in step S2, the spinning assembly includes at least three spinning shafts with spinning wheels evenly distributed circumferentially. Each spinning shaft has an axial adjustment displacement along the axis of the sleeve body and a radial adjustment displacement along the radial direction of the sleeve body. The narrowing end has a narrowing edge that faces away from the sealing end. During the fitting and narrowing operation...

[0014] The spinning shafts are axially displaced sequentially from the sealing end to the narrowing edge, and radial step displacement is performed during the axial displacement of any of the spinning shafts.

[0015] In step S3, several spinning shafts undergo synchronous axial displacement from the constricted edge to the open end.

[0016] Preferably, in step S1, the sleeve body of the cap workpiece blank includes a first tube wall connected to the open end and a second tube wall connecting the first tube wall and the sealed end. The outer diameter of the second tube wall is larger than the inner diameter of the first tube wall and smaller than the outer diameter of the first tube wall, and the inner diameter of the second tube wall is smaller than the inner diameter of the first tube wall.

[0017] In step S2, the inner lining fixture includes an inner lining column for protruding into the inner cavity of the tube sleeve body. The free end of the inner lining column is provided with a positioning protrusion located in the second tube wall. A transition cone is provided between the inner lining column and the free end. The constricted edge is arranged opposite to the transition cone.

[0018] Preferably, in step S1, the cap body workpiece blank is formed by stamping the tube body on the sheet.

[0019] This invention also proposes a combined stretching and spinning apparatus, including a spinning device.

[0020] The spinning equipment includes an inner lining fixture carrier for mounting the inner lining fixture and a spinning assembly unit for mounting the spinning assembly.

[0021] The inner lining fixture carrier has a carrier rotation source;

[0022] The spinning assembly includes at least three spinning shafts with spinning wheels evenly distributed circumferentially, and each spinning assembly unit includes a spinning drive mechanism corresponding to one of the spinning shafts.

[0023] The spinning drive mechanism includes a shaft support body for mounting the spinning shaft, a combined transmission source connected to the shaft support body for driving the shaft support body to perform axial and radial adjustment displacements, and a spinning shaft rotation source disposed on the shaft support body and axially connected to the spinning shaft.

[0024] Preferably, the shaft support body includes a support base and a sliding bracket slidably coupled to the support base, and the combined transmission source includes a radial adjustment drive source that is pulsatorically connected to the support base and an axial adjustment drive source that is pulsatorically coupled to the sliding bracket and disposed on the support base.

[0025] Preferably, it includes a blank stamping die for forming the cap body workpiece blank, and the sleeve body of the cap body workpiece blank includes a first tube wall connected to the open end and a second tube wall connecting the first tube wall and the closed end;

[0026] The blank stamping die includes a first pipe wall forming station for forming the first pipe wall and the sealing end, a second pipe wall forming station for forming the second pipe wall on the first pipe wall, and an outer edge punching and unloading station for cutting the outer edge of the ring edge, arranged sequentially along the material strip direction.

[0027] Preferably, the first pipe wall forming station includes a plurality of first pipe wall transition forming stations in which the inner diameter of the first pipe wall decreases along the material strip direction, and the second pipe wall forming station includes a plurality of second pipe wall transition forming stations in which the inner diameter of the second pipe wall decreases along the material strip direction.

[0028] The beneficial effects of this invention are mainly reflected in:

[0029] 1. It can achieve stretching and spinning of the cap body workpiece to meet the requirements of uniform wall thickness stretching deformation.

[0030] 2. By adopting a method of first narrowing the neck to ensure concentricity and then stretching, the quality of product stretching and spinning is significantly improved.

[0031] 3. The structural design of the first and second pipe walls ensures the structural strength and positioning tensile stability of the constricted end, thereby ensuring uniform and controllable pipe wall extension deformation and greatly improving the product qualification rate.

[0032] 4. The stretching and spinning combination equipment meets the process requirements and improves production efficiency. Attached Figure Description

[0033] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0034] Figure 1 This is a schematic diagram of the hat body forming process of the stretching and spinning process of the hat body workpiece of the present invention.

[0035] Figure 2 This is a schematic diagram of the necking of the spinning device in the stretching and spinning combined equipment of the present invention.

[0036] Figure 3 This is a schematic diagram of the stretching and spinning process of the spinning equipment in the stretching and spinning combined equipment of the present invention.

[0037] Figure 4 This is a schematic diagram of the structure of the blank stamping mold in the stretching and spinning combined equipment of the present invention.

[0038] Figure 5 This is a perspective structural diagram of the blank stamping die in the stretching and spinning combined equipment of the present invention. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in the present application can be combined with each other.

[0041] This invention provides a stretching and spinning process for cap body workpieces, such as... Figures 1 to 3 As shown, the cap body workpiece includes a sleeve body 100 with a sealed end 110 and a ring edge 200 disposed on one side of the open end 120 of the sleeve body.

[0042] In traditional processes, the blank of the cap body is usually made first, and then the tube body 100 is spun and stretched to make its wall thinner. The thickness of the tube wall is generally no more than 0.5mm, and the wall thickness of some special workpieces is even within 0.2mm. The wall thickness runout error of traditional spinning is generally ±0.1mm, which is difficult to meet the requirements of high-precision forming. It is also necessary to combine it with milling and grinding processes for secondary processing, resulting in low production efficiency and high product scrap rate.

[0043] In response to this situation, combined with Figure 1 The process and principle of the stretching and spinning process for the cap body workpiece in this case are explained as follows:

[0044] First, a cap body workpiece blank 300 is fabricated. This cap body workpiece blank is based on existing technology and is generally formed by stamping or cold heading, resulting in the tube body 100 and the ring edge 200 on the sheet material. Forming the cap body workpiece blank by stamping the tube body on the sheet material meets the requirements of efficient production.

[0045] Next, the tube sleeve body 100 is stretched and spun into shape:

[0046] During the spinning and stretching operation, the necking and bonding are first performed. The inner lining fixture 1 is used to line the tube body of the cap workpiece blank 300 and rotate it. The spinning assembly 2 is used to radially bond and bond the sealing end 110 side of the tube body to form the necking end 400, so that the inner wall of the necking end 400 is bonded to the inner lining fixture.

[0047] Then, stretching and spinning are performed. The inner lining fixture drives the cap body workpiece blank to rotate, and the spinning assembly 2 performs stretching and spinning operations on the tube sleeve body from the constricted end to the open end.

[0048] Specifically, firstly, by forming the constricted end 400, a high degree of concentricity is achieved between the constricted end 400 and the free end of the inner lining fixture 1. Then, with this concentricity precision, subsequent stretching and spinning from the constricted end to the open end is carried out, thereby meeting the uniformity requirements of the tube wall thickness in stretching and spinning, achieving high-precision wall thickness control, greatly improving the stretching and spinning efficiency and quality stability, and significantly improving the product qualification rate.

[0049] In one specific embodiment, such as Figures 1 to 3 As shown, the spinning assembly 2 includes at least three spinning shafts 22 with spinning wheels 21 evenly distributed in the circumference. Each spinning shaft 22 has an axial adjustment displacement along the axis of the tube body and a radial adjustment displacement along the radial direction of the tube body. The constricted end has a constricted edge 410 that is away from the sealing end.

[0050] During the bonding and narrowing operation, several spinning shafts move axially from the sealing end to the narrowing edge in sequence, and radial step displacement is performed during the axial displacement of any spinning shaft; several spinning shafts move synchronously from the narrowing edge to the open end.

[0051] Detailed implementation process and principle explanation:

[0052] Reference Figure 2 As shown, the first spinning wheel to contact the main body of the sleeve is the initial correction spinning wheel 21a. At this time, the inner liner fixture is rotating, and its axial and radial cutting is gradually spun, causing the cap body workpiece blank to generate a certain centrifugal correction rotation. Under the gradual cutting of the initial correction spinning wheel 21a, the main body of the sleeve 100 is subjected to pressure deformation and its swing amplitude is restricted.

[0053] Next, the spinning wheel that contacts the main body of the tube sleeve is the matching eccentric adjustment spinning wheel 21b. When the matching eccentric adjustment spinning wheel 21b contacts the main body of the tube sleeve, it produces a two-point spinning fit with the initial correction spinning wheel 21a with a two-point circumferential interval and an axial interval. At this time, both of them have axial and radial step displacement at the same time. Under the synchronous action of the two, the free amount between the constricted end and the inner lining fixture becomes smaller and smaller, and the cone-shaped relative displacement amplitude it produces also gradually decreases.

[0054] Finally, the finishing and shaping spinning roller 21c contacts the main body of the tube sleeve. It forms a three-point spinning fit with the initial correction spinning roller 21a and the eccentric adjustment spinning roller 21b, with a three-point circumferential and axial spacing. This meets the requirements for high-precision correction and necking. After it contacts the main body of the tube sleeve, the initial correction spinning roller 21a, the eccentric adjustment spinning roller 21b, and the finishing and shaping spinning roller 21c reach the necking end in sequence. At this time, the necking end achieves high-precision necking positioning, and the necking end and the inner lining fixture also achieve reliable fit.

[0055] Once the narrowed end is formed with high precision and fits reliably and stably, the initial correction spinning roller 21a, the eccentric adjustment spinning roller 21b, and the finishing and shaping spinning roller 21c perform synchronous stretching and spinning operations.

[0056] It should be noted that the initial correction spinning wheel 21a, the eccentric adjustment spinning wheel 21b, and the finishing and shaping spinning wheel 21c are functionally limited according to their sequential order. The number of any one functional spinning wheel is unlimited, as is the number of circumferentially distributed points.

[0057] In one specific embodiment, the sleeve body 100 of the cap workpiece blank 300 includes a first tube wall 310 connected to the open end and a second tube wall 320 connecting the first tube wall and the sealed end. The outer diameter of the second tube wall is larger than the inner diameter of the first tube wall and smaller than the outer diameter of the first tube wall, and the inner diameter of the second tube wall is smaller than the inner diameter of the first tube wall.

[0058] The inner lining fixture includes an inner lining column for inserting into the inner cavity of the main tube sleeve. The free end of the inner lining column is provided with a positioning protrusion 11 located in the second tube wall. A transition cone 12 is provided between the inner lining column and the free end, and the constricted edge is positioned opposite to the transition cone 12.

[0059] Specifically, the constricted end 400 is generally similar in wall thickness to the main body 100 of the sleeve. In this case, the constricted end 400 is used as the tight fit positioning point with the inner lining fixture to meet the forming requirements of stretching and spinning.

[0060] To increase the reliability of the stretch spinning process and meet certain stretch spinning elongation ratios, a design of a first tube wall 310 and a second tube wall 320 is adopted. Specifically, during the necking process, the second tube wall 320 is necked to form a necked end that fits tightly with the positioning protrusion 11 with high precision. This provides a highly reliable tight fit, while the transition cone acts as a barrier against tensile deformation of the second tube wall 320. After the first tube wall 310 is stretched and spun, it meets the requirements for precise wall thickness control and ensures the uniformity and stability of its axial extension. This significantly improves the product yield. After product forming, the necked end meets structural strength requirements, resulting in a substantial improvement in product quality.

[0061] This case also proposes a combined stretching and spinning equipment for realizing the stretching and spinning process of the cap body workpiece.

[0062] Specifically, this includes spinning equipment. Figure 2 and Figure 3 This is a simplified schematic diagram of a spinning machine. It is not a rigorous industrial drawing; it merely illustrates the actions involved in the process. The spinning wheel displacement mechanism and drive source of the spinning machine are existing technologies. Figure 2 and Figure 3 The spinning equipment is mainly used to reveal the hardware control principles integrated with the process.

[0063] The spinning apparatus 500 includes an inner liner fixture carrier 510 for mounting the inner liner fixture 1 and a spinning assembly unit for mounting the spinning assembly. The inner liner fixture carrier 510 has a carrier rotation source 511.

[0064] The spinning assembly 2 includes at least three spinning shafts 22 with spinning wheels 21 evenly distributed in the circumference, and the spinning assembly unit includes a spinning drive mechanism 520 that is arranged one-to-one with the spinning shaft.

[0065] The spinning drive mechanism 520 includes a shaft support body 521 for mounting the spinning shaft, a combined transmission source 522 for driving the shaft support body to perform axial and radial adjustment displacements, which is connected to the shaft support body, and a spinning shaft rotation source 523 provided on the shaft support body and connected to the spinning shaft in the axial transmission.

[0066] Specifically, the spinning drive mechanism 520 can adjust the axial and radial displacement of the shaft support body 521 relative to the sleeve body 100 through the combined transmission source 522, thereby satisfying the position adjustment of the spinning shaft 22. The spinning wheel 21 is driven to rotate by the spinning shaft rotation source 523 to meet its self-rotation spinning requirements.

[0067] In this embodiment, the design of initial correction spinning wheel 21a, eccentric adjustment spinning wheel 21b, and fine finishing spinning wheel 21c is also adopted. Of course, in specific implementation, they can be arranged in the order of contact according to the rotation direction of the inner lining fixture, and their number is not limited.

[0068] In one specific embodiment, such as Figure 2 and Figure 3 As shown, the shaft support body includes a support base and a sliding bracket slidably connected to the support base. The combined transmission source includes a radial adjustment drive source that is connected to the support base and an axial adjustment drive source that is connected to the sliding bracket and disposed on the support base.

[0069] That is, the drive structure that combines the X and Y axes in the traditional transmission mechanism can be used. Of course, the two-way combined displacement control can also be achieved by using screw drive, cylinder extension and retraction, etc. As long as the drive mechanism that meets the requirements of relative axial adjustment and radial adjustment of the shaft support body 521 is within the protection scope of this case.

[0070] In one specific embodiment, such as Figure 4 and Figure 5 As shown, it includes a blank stamping die 600 for forming a hat body workpiece blank, and the sleeve body of the hat body workpiece blank includes a first tube wall connected to the open end and a second tube wall connecting the first tube wall and the closed end.

[0071] The blank stamping forming die includes a first pipe wall forming station 610 for forming the first pipe wall and the sealing end, a second pipe wall forming station 620 for forming the second pipe wall on the first pipe wall, and an outer edge punching and unloading station 630 for cutting the outer edge of the ring edge, arranged sequentially along the material strip direction.

[0072] The first pipe wall forming station includes several first pipe wall transition forming stations in which the inner diameter of the first pipe wall decreases along the material strip direction, and the second pipe wall forming station includes several second pipe wall transition forming stations in which the inner diameter of the second pipe wall decreases along the material strip direction.

[0073] Specifically, the first and second pipe walls can be gradually formed by the blank stamping die. The structural strength of the first and second pipe walls is ensured by the gradual narrowing method. In the subsequent stretching and spinning process, the strength of the narrowed structure of the second pipe wall is ensured to be reliable, and the stretching and spinning of the first pipe wall is required to be uniform and have the stretching ratio.

[0074] The above description demonstrates that the cap body workpiece can be stretched and spun, ensuring uniform wall thickness deformation. The method of first concentrically shaping the neck before stretching significantly improves the quality of the stretched and spun product. The structural design of the first and second tube walls guarantees the structural strength and positioning tensile stability of the necked end, ensuring uniform and controllable tube wall extension deformation and greatly improving the product qualification rate. The combined stretching and spinning equipment meets the process requirements and improves production efficiency.

[0075] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent in such process, method, article, or apparatus / device.

[0076] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A stretching and spinning process for a cap body, wherein the cap body includes a sleeve body with a sealed end and a ring edge disposed on one side of the open end of the sleeve body, characterized in that... Includes the following steps: S1 is used to fabricate the blank of the hat body workpiece; S2 shrinking and bonding: The inner lining fixture is used to line the tube body of the cap workpiece blank and rotate it. The spinning component is used to radially bond and shrink one side of the sealing end of the tube body to form a shrinking end, so that the inner wall of the shrinking end is bonded to the inner lining fixture. S3 stretch spinning: the inner lining fixture drives the cap body workpiece blank to rotate, and the spinning assembly performs stretch spinning operation on the tube sleeve body from the constricted end to the open end. In step S2, the spinning assembly includes at least three spinning shafts with spinning wheels evenly distributed circumferentially. Each spinning shaft has axial adjustment displacement along the axis of the sleeve body and radial adjustment displacement along the radial direction of the sleeve body. The narrowing end has a narrowing edge that is away from the sealing end. During the fitting and narrowing operation... The spinning shafts are axially displaced sequentially from the sealing end to the narrowing edge, and radial step displacement is performed during the axial displacement of any of the spinning shafts. In step S3, several spinning shafts undergo synchronous axial displacement from the constricted edge to the open end. In step S1, the sleeve body of the cap workpiece blank includes a first tube wall connected to the open end and a second tube wall connecting the first tube wall and the sealed end. The outer diameter of the second tube wall is larger than the inner diameter of the first tube wall and smaller than the outer diameter of the first tube wall, and the inner diameter of the second tube wall is smaller than the inner diameter of the first tube wall. In step S2, the inner lining fixture includes an inner lining column for protruding into the inner cavity of the tube sleeve body. The free end of the inner lining column is provided with a positioning protrusion located in the second tube wall. A transition cone is provided between the inner lining column and the free end. The constricted edge is arranged opposite to the transition cone.

2. The stretching and spinning process for the cap body workpiece according to claim 1, characterized in that: In step S1, the cap body workpiece blank is formed by stamping the tube body on the sheet.

3. A combined stretching and spinning equipment for cap body workpieces based on the stretching and spinning process described in any one of claims 1 to 2, characterized in that: Including spinning equipment, The spinning equipment includes an inner lining fixture carrier for mounting the inner lining fixture and a spinning assembly unit for mounting the spinning assembly. The inner lining fixture carrier has a carrier rotation source; The spinning assembly includes at least three spinning shafts with spinning wheels evenly distributed circumferentially, and each spinning assembly unit includes a spinning drive mechanism corresponding to one of the spinning shafts. The spinning drive mechanism includes a shaft support body for mounting the spinning shaft, a combined transmission source connected to the shaft support body for driving the shaft support body to perform axial and radial adjustment displacements, and a spinning shaft rotation source disposed on the shaft support body and connected to the spinning shaft.

4. The stretching and spinning combined equipment according to claim 3, characterized in that: The shaft support body includes a support base and a sliding bracket slidably coupled to the support base. The combined transmission source includes a radial adjustment drive source that is pulsatorically connected to the support base and an axial adjustment drive source that is pulsatorically coupled to the sliding bracket and disposed on the support base.

5. The stretching and spinning combined equipment according to claim 3, characterized in that: Includes a blank stamping die for forming the blank of the cap body workpiece, wherein the sleeve body of the blank of the cap body workpiece includes a first tube wall connected to the open end and a second tube wall connecting the first tube wall and the closed end; The blank stamping die includes a first pipe wall forming station for forming the first pipe wall and the sealing end, a second pipe wall forming station for forming the second pipe wall on the first pipe wall, and an outer edge punching and unloading station for cutting the outer edge of the ring edge, arranged sequentially along the material strip direction.

6. The stretching and spinning combined equipment according to claim 5, characterized in that: The first pipe wall forming station includes several first pipe wall transition forming stations in which the inner diameter of the first pipe wall decreases along the material strip direction, and the second pipe wall forming station includes several second pipe wall transition forming stations in which the inner diameter of the second pipe wall decreases along the material strip direction.

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