Local thickening forming equipment for large-thickness-difference stepped internal tooth part
By designing a forming equipment including multiple rotor wheels, the existing spinning technology solves the material folding, folding marks and collapse angle problems when processing large-thick and difference step internal tooth parts, and achieves efficient, precise processing and quality improvement of the parts.
Patent Information
- Application Number
- CN202421793413.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-25
- Publication Date
- 2025-04-29
- Estimated Expiration
- 2034-07-25
AI Technical Summary
When processing large-thick and different step internal tooth parts, existing spinning technology requires multiple spinning operations, resulting in folding materials, folding patterns inside, and easy to form collapse angles, increasing the difficulty and cost of processing.
A large-thickness step internal tooth part thickening molding device is designed, including an upper core mold, a lower core mold, a first rotating wheel, a second rotating wheel and a third rotating wheel. Through a specific rotating wheel design and process route, the material is accurately transferred to the parts that need to be thickened, and compensate for the collapse angle formed during the bending process.
One-time processing of large-thick and difference step internal teeth parts is achieved, production efficiency and product quality are improved, core mold root cracking is delayed, the material is sufficient at the intersection of the end surface and the outer diameter, and the material folding, folding marking and collapse angle problems in the existing spinning technology are solved.
Smart Images
Figure CN222805900U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of automobile parts, in particular to a local thickening and forming device for a large thickness difference stepped internal tooth part. Background Art
[0002] With the vigorous development of the automotive industry, transmission technology continues to evolve, and the structure of parts is becoming increasingly complex to meet the diversified functional requirements. In particular, in the processing of parts with significant differences in stepped teeth, tooth bottom transition zone and tooth wall thickness, the mainstream processing technology faces two major challenges.
[0003] First, the traditional processing technology mainly relies on forging methods for forming. However, this method has obvious limitations, such as low forming accuracy, low processing efficiency, and poor surface roughness of the tooth shape and internal contour of the parts. Not only does it affect the overall performance of the parts, it may also increase the difficulty of subsequent processing and debugging. The energy demand is high, which is not in line with the concept of green development.
[0004] Second, reciprocating spinning is used to form raw materials with a thickness higher than the step profile. Although this strategy attempts to overcome the limitations of traditional forging methods at a theoretical level, it also has obvious disadvantages. First, the increase in the thickness of the raw material plate directly leads to a significant reduction in material utilization, which often requires special customization, resulting in a significant increase in raw material costs. Secondly, due to the thicker raw materials, the precise forming of the step profile becomes more difficult. Especially when faced with stepped tooth-shaped parts with significant thickness differences, the thick material repeatedly squeezes the core mold during the spinning process, which not only causes the temperature of the core mold to rise sharply during processing, but also significantly reduces its wear resistance, which can easily lead to cracking on the root side of the core mold. These problems undoubtedly increase the difficulty and cost of processing. In addition, reciprocating spinning requires high skills from the operator, and the entire processing process is also difficult to control.
[0005] With the continuous advancement of spinning technology, existing solutions, such as using V-grooves to thicken the edges of the raw materials of the disc, can achieve the thickening effect, but often require multiple spinning operations, causing the material to fold and fold lines to appear inside; and the solution of using rolling wheels to thicken the barrel wall requires the cooperation of multiple rolling wheels and is not suitable for tooth processing. What is even more difficult is that local thickening in the middle of the disc is still a problem to be solved. In addition, during the forming process, the blank is prone to collapse at the bend, resulting in insufficient material at the intersection of the end face and the outer diameter. Utility Model Content
[0006] The utility model aims to provide a local thickening forming device for large thickness difference stepped internal tooth parts, aiming to solve the problem that the existing spinning technology requires multiple spinning operations, folding lines appear inside the folded material, and it is easy to form collapsed angles.
[0007] To achieve the above-mentioned purpose, in a first aspect, the utility model provides a local thickening forming device for a large thickness difference stepped internal gear part, comprising a tail top, an upper core mold, a blank, a main shaft, a lower core mold, a first roller, a second roller and a third roller;
[0008] The upper core mold is arranged on one side of the blank, the lower core mold is arranged on the side of the blank away from the tail top, the main shaft is fixedly connected to the lower core mold and is located on the side of the lower core mold away from the blank, the tail top is fixedly connected to the upper core mold and is located on the side of the upper core mold away from the blank, and the first rotating wheel, the second rotating wheel and the third rotating wheel are respectively arranged on one side of the blank.
[0009] The first rotating wheel, the second rotating wheel and the third rotating wheel are evenly distributed at 120° in the circumferential direction and have a height difference of 5 mm in the axial direction.
[0010] The third rotating wheel has a chamfer and a profile, and the angle between the profile and the axial direction is designed to be 45°-60°.
[0011] Wherein, the first rotating wheel has a large arc surface.
[0012] In a second aspect, the utility model also provides a method for local thickening forming of a large thickness difference stepped internal tooth part, comprising the following steps:
[0013] The upper core mold and the lower core mold are closed and pressed to fix the blank;
[0014] Pre-pressing the blank using a first rotary wheel;
[0015] Rotate the third rotary wheel to the starting position for shoveling materials, and shovel materials from bottom to top;
[0016] The vertical part of the second rotating wheel is horizontally extruded to compensate for the corner collapse defect at the local thickening of the inner contour.
[0017] The utility model discloses a local thickening forming device for a large thickness difference stepped internal tooth part, which combines the upper core mold and the lower core mold and presses and fixes the blank; uses the first rotary wheel to pre-press the blank; rotates the third rotary wheel to the starting position of the shoveling material, and shovels the material from bottom to top; and horizontally extrude the vertical part of the second rotary wheel to compensate for the angle collapse defect at the local thickening of the inner contour. The forming device cleverly utilizes the characteristics of material flow, and through specific rotary wheels and process routes, accurately transfers the material of the tooth-shaped part of the blank to the part that needs to be thickened, reduces the thickness of the raw material at the tooth-shaped part, thereby delaying the cracking of the core mold tooth root. At the same time, it can also effectively compensate for the angle collapse formed in the bending process, and ensure that the material at the intersection of the end face and the outer diameter is sufficient, including the forming of the stepped tooth shape, which greatly improves the production efficiency and product quality, and solves the problem that the existing spinning technology requires multiple spinning operations, folding lines appear inside the folded material, and angle collapse is easy to form. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0019] Figure 1 The utility model is a structural schematic diagram of a local thickening and forming device for a large thickness difference stepped internal gear part.
[0020] Figure 2 It is a schematic diagram of the first rotating wheel provided by the utility model.
[0021] Figure 3 It is a schematic diagram of the second rotating wheel provided by the utility model.
[0022] Figure 4 It is a schematic diagram of the third rotating wheel provided by the utility model.
[0023] Figure 5 The utility model provides a flow chart of a local thickening forming method for a large thickness difference stepped internal gear part.
[0024] In the figure: 1-tail top, 2-upper core mold, 3-blank, 4-spindle, 5-lower core mold, 6-first rotating wheel, 7-second rotating wheel, 8-third rotating wheel. DETAILED DESCRIPTION
[0025] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.
[0026] See also Figures 1 to 4 The utility model provides a local thickening forming device for large thickness difference stepped internal gear parts, comprising a tail top 1, an upper core mold 2, a blank 3, a main shaft 4, a lower core mold 5, a first rotating wheel 6, a second rotating wheel 7 and a third rotating wheel 8;
[0027] The upper core mold 2 is arranged on one side of the blank 3, the lower core mold 5 is arranged on the side of the blank 3 away from the tail top 1, the main shaft 4 is fixedly connected to the lower core mold 5, and is located on the side of the lower core mold 5 away from the blank 3, the tail top 1 is fixedly connected to the upper core mold 2, and is located on the side of the upper core mold 2 away from the blank 3, and the first rotating wheel 6, the second rotating wheel 7 and the third rotating wheel 8 are respectively arranged on one side of the blank 3.
[0028] In this embodiment, the spindle 4 provides installation conditions for the lower core mold 5, the upper core mold 2 and the lower core mold 5 are molded together and pressed to fix the blank 3; the first rotary wheel 6 is used to pre-press the blank 3; the third rotary wheel 8 is rotated to the starting position of the shoveling material, and the shoveling material is performed from bottom to top; the vertical part of the second rotary wheel 7 is horizontally extruded to compensate for the collapse angle defect at the local thickening of the inner contour. The forming equipment cleverly utilizes the characteristics of material flow, and through specific rotary wheels and process routes, the material of the corresponding tooth-shaped part of the blank 3 is accurately transferred to the part that needs to be thickened, reducing the thickness of the raw material at the tooth-shaped part, thereby delaying the cracking of the core mold tooth root. At the same time, it can also effectively compensate for the collapse angle formed during the bending process, ensuring that there is sufficient material at the intersection of the end face and the outer diameter, including the forming of the stepped tooth shape, which greatly improves the production efficiency and product quality, and solves the problem that the existing spinning technology requires multiple spinning operations, folding lines appear inside the folded material, and collapse angles are easily formed;
[0029] The forming equipment designs the rotating wheel to be composite, which can achieve multiple uses. For example, the first rotating wheel 6 is composed of multiple chamfers (R) to form a large arc surface, which can not only avoid the risk of material breakage during the pre-stressing and bending process, but the protruding R angle can be used for tooth forming. The design of the third rotating wheel 8 can make full use of the plasticity of the material, so that the disc blank 3 can be locally thickened by more than 3 times. The second rotating wheel 7 is compensated by the arc angle and the collapsed angle at the bending point, and the forming of a large thickness difference step tooth shape is completed at one time.
[0030] See also Figure 5In a second aspect, the utility model further provides a local thickening forming method for a large thickness difference stepped internal gear part, comprising the following steps:
[0031] S1: close the upper core mold 2 and the lower core mold 5 and press and fix the blank 3;
[0032] Specifically, the upper core mold 2 and the lower core mold 5 are used to clamp and fix the disc blank 3, so as to ensure that during the spinning process, the deformation of the blank 3 remains stable and is uniformly deformed under program control.
[0033] S2 uses the first roller 6 to pre-press the blank 3;
[0034] Specifically, the first rotary wheel 6 is used for pre-pressing, and first rotates counterclockwise to preliminarily bend the blank 3 to an angle of about 30°. Subsequently, the first rotary wheel 6 continues to perform the bending operation at an angle of about 40°, thereby gradually pre-pressing the sheet into a barrel shape. This specific travel path design reduces the angle collapse phenomenon that may occur at the bend to a certain extent, pre-presses the blank 3 into a barrel shape, and lays the foundation for subsequent local thickening and tooth profile forming. The unique profile of the first rotary wheel 6 is composed of a large arc surface formed by the intersection of multiple different R angles, which can prevent the risk of breakage of thick materials during the process of bending into a barrel, and the convex R angle can meet the requirements of tooth profile forming.
[0035] S3: rotating the third rotary wheel 8 to the starting position for shoveling materials, and shoveling materials from bottom to top;
[0036] Specifically, the use of the third rotating wheel 8 is a key step in local thickening. First, according to actual needs, the third rotating wheel 8 is moved to the starting position of shoveling. The third rotating wheel 8 shovels the material from bottom to top in a movement route of about 5° with the Z axis, and its R angle and profile design enable the material to be accumulated from the outer wall of the blank 3 to the part that needs to be thickened. The angle design (45°-60°) between the profile of the third rotating wheel 8 and the axial direction helps to control the direction of material flow and the uniformity of accumulation;
[0037] The first rotating wheel 6, the second rotating wheel 7 and the third rotating wheel 8 are evenly distributed at 120° in the circumferential direction, and there is a height difference of 5mm between the three rotating wheels in the axial direction. The first rotating wheel 6 is the front, the second rotating wheel 7 is the back, and the third rotating wheel 8, due to its special rounded profile, is before the second rotating wheel 7, which can effectively reduce the thickness of the blank 3 during the tooth shape forming, thereby reducing the repeated extrusion of the core mold and improving the life of the core mold. By maintaining a height difference of 5mm and moving downward at the same time, the three rotating wheels can complete the forming of the step profile and the stepped tooth shape at one time. This process design improves the processing efficiency and forming accuracy.
[0038] S4 performs horizontal extrusion on the vertical part of the second roller 7 to compensate for the corner collapse defect at the local thickening of the inner contour.
[0039] Specifically, the vertical part of the second rotating wheel 7 is used for horizontal extrusion to compensate for the corner collapse defect at the local thickening of the inner contour, ensure that the material at the intersection of the end face and the outer diameter of the finished product is sufficient, and avoid the problem of insufficient material.
[0040] Through optimized mold design, this method can use thinner blank materials to complete the processing of locally thicker contours, while effectively compensating for the collapsed angle formed by bending during molding. The processing steps that originally required multiple processes are combined into one process, thereby realizing the one-time processing of large thickness difference stepped internal gear parts. The advantage of this method is not only that it improves processing efficiency, but also reduces material waste and processing costs. By precisely controlling the mold structure and processing parameters, we can ensure the processing accuracy and surface quality of the parts to meet the automotive industry's demand for high-quality parts.
[0041] What is disclosed above is only a preferred embodiment of the local thickening and forming equipment of large thickness difference stepped internal tooth parts of the utility model. Of course, it cannot be used to limit the scope of rights of the utility model. Ordinary technicians in this field can understand that all or part of the processes of the above embodiments and equivalent changes made according to the claims of the utility model still fall within the scope covered by the utility model.
Claims
1. A local thickening forming equipment for large thickness difference stepped internal gear parts, characterized in that: It includes a tail top, an upper core mold, a blank, a main shaft, a lower core mold, a first rotary wheel, a second rotary wheel and a third rotary wheel; The upper core mold is arranged on one side of the blank, the lower core mold is arranged on the side of the blank away from the tail top, the main shaft is fixedly connected to the lower core mold and is located on the side of the lower core mold away from the blank, the tail top is fixedly connected to the upper core mold and is located on the side of the upper core mold away from the blank, and the first rotating wheel, the second rotating wheel and the third rotating wheel are respectively arranged on one side of the blank.
2. The local thickening forming equipment for large thickness difference stepped internal gear parts according to claim 1, characterized in that: The first rotating wheel, the second rotating wheel and the third rotating wheel are evenly distributed at 120° in the circumferential direction and have a height difference of 5 mm in the axial direction.
3. The local thickening forming equipment for large thickness difference stepped internal gear parts according to claim 1, characterized in that: The third rotating wheel has a chamfer and a profile, and the angle between the profile and the axial direction is designed to be 45°-60°.
4. The local thickening forming equipment for large thickness difference stepped internal gear parts according to claim 1, characterized in that: The first rotating wheel has a large arc surface.