A steel-aluminum composite spline shaft forging die

Abstract

This utility model discloses a steel-aluminum composite spline shaft forging die. An electric heating wire is embedded in the lower die to heat the steel spline shaft. Combined with the spring action on the punch, when the punch acts on the aluminum sleeve, the spring reduces the impact of the buffer head on the aluminum tube, achieving relative positioning between the punch end and the steel spline shaft. When the spring is further compressed, the sleeves on both sides of the punch act on the aluminum tube, pressing the aluminum tube to bond with the steel spline shaft. This utility model's steel-aluminum composite spline shaft forging die features a simple structure, making the stamping process more convenient and faster. It uses a preheated steel spline shaft, combined with a spring to achieve two-stage pressure, maintaining pressure until the aluminum material completely fills the annular groove and between the spline teeth, resulting in a 10% increase in connection strength, a production cycle of 120 seconds per piece, and a scrap rate of <0.5%.

Description

Technical Field

[0001] This utility model relates to the field of composite connection processing technology of dissimilar materials, and more specifically, to a steel-aluminum composite spline shaft forging die. Background Technology

[0002] The existing commercial vehicle driveshaft assemblies, particularly the intermediate driveshaft assembly, still have significant problems. All its parts are made of steel, which results in heavy components and high centrifugal force at high speeds, leading to high fuel consumption. High fuel consumption and excessive emissions fail to achieve energy conservation and environmental protection goals. Currently, if the driveshaft of the intermediate driveshaft assembly were replaced with an aluminum alloy one, there is no high-strength aluminum alloy intermediate spline shaft to replace it, as its strength and toughness do not meet the requirements of the entire vehicle. Since the different materials cannot be welded, a steel driveshaft assembly is the only option. These factors result in an overweight vehicle chassis, leading to high fuel consumption and excessive emissions at high speeds, making it neither energy-efficient nor environmentally friendly.

[0003] To address the aforementioned technical problems, the applicant has proposed CN210978266U, a lightweight aluminum alloy composite intermediate drive shaft assembly, and CN211617430U, an all-aluminum alloy automotive drive shaft assembly, to solve these problems.

[0004] Although the above structure can solve the aforementioned technical problems, it has been found in actual production that the process of assembling this aluminum alloy shaft tube with a steel spline shaft is relatively complex and the forming effect is poor.

[0005] Therefore, it is necessary to propose a steel-aluminum composite spline shaft forging die, which is of great significance for improving the forming quality of steel-aluminum composite spline shafts. Utility Model Content

[0006] This utility model provides a steel-aluminum composite spline shaft forging die, which solves the problems of insufficient aluminum material filling in the spline groove, deformation of the inner flange end, and overflow, thereby improving batch production efficiency and reducing scrap rate.

[0007] According to one aspect of the present invention, a steel-aluminum composite spline shaft forging die is provided, comprising an upper die, a lower die, and a punch. The upper die is pressed onto the lower die, and an upper die sleeve is fitted inside the upper die. A lower die sleeve adapted to the spline shaft is fitted inside the lower die, and an electric heating wire is embedded in the lower die. A punching hole is provided on the upper die, the upper die sleeve is located below the punching hole, and the punch moves within the punching hole. An aluminum tube is provided within the punching hole.

[0008] Based on the above scheme, the punch includes a sleeve, a core, and a spring. The core is movably mounted in the sleeve via the spring. The core and the sleeve pass through the punching hole. The aluminum tube is sleeved outside the core and positioned between the punching holes.

[0009] Based on the above scheme, preferably, the sleeve body has a space, and the bottom of the sleeve body is open and sealed by an end cap. The top of the core head passes through the sleeve body, and the bottom of the core head presses against the spring, so that the core head is confined within the space.

[0010] Based on the above scheme, a preferred embodiment is provided on the outer edge surface of the sleeve, and the limiting step intermittently presses against the end face of the upper mold.

[0011] Based on the above scheme, preferably, the end face of the lower mold that contacts the upper mold is provided with a guide shaft, and the upper mold is provided with a guide groove that is adapted to the guide shaft.

[0012] This utility model discloses a steel-aluminum composite spline shaft forging die. An electric heating wire is embedded in the lower die to heat the steel spline shaft inside. Combined with the action of the spring on the punch, when the punch acts on the aluminum sleeve, the spring reduces the action of the buffer head and the aluminum tube, realizing the relative positioning of the end of the punch and the steel spline shaft. When the spring is further compressed, the sleeves on both sides of the punch act on the aluminum tube, pressing the aluminum tube to combine with the steel spline shaft.

[0013] This utility model discloses a steel-aluminum composite spline shaft forging die. Its simple structure makes the stamping process more convenient and faster. It uses a preheated steel spline shaft and combines springs to achieve two-stage pressure, so as to achieve pressure holding until the aluminum material completely fills the annular groove and spline teeth, thereby increasing the connection strength by 10%, with a production cycle of 120s / piece and a scrap rate of <0.5%. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0015] Figure 1 This is a schematic diagram of the steel-aluminum composite spline shaft forging die of this utility model;

[0016] Figure 2 This is a schematic diagram of the steel-aluminum composite spline shaft of this utility model;

[0017] Figure 3 This is a schematic diagram of the steel spline shaft of this utility model;

[0018] Explanation of icon numbers:

[0019] 1. Upper die; 2. Lower die; 3. Punch; 4. Upper die sleeve; 5. Lower die sleeve; 6. Heating wire; 7. Punching hole; 8. Aluminum tube; 9. Guide shaft; 10. Guide groove; 31. Sleeve body; 32. Core head; 33. Spring; 34. Space; 35. End cap; 36. Limiting step; 100. Steel spline shaft. Detailed Implementation

[0020] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0021] It should be understood that, when used in this specification and the appended claims, the term "comprising" indicates the presence of a descriptive feature, integral, step, operation, element, and / or component, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or sets.

[0022] To keep the drawings concise, only the parts relevant to this invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of the components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0023] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0024] In the embodiments shown in the accompanying drawings, the directional indications (such as up, down, left, right, front, and back) used to explain the structure and movement of the various components of this invention are relative rather than absolute. These descriptions are appropriate when these components are in the positions shown in the drawings. If the descriptions of the positions of these components change, these directional indications also change accordingly.

[0025] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0027] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0028] Please see Figure 1 and combined Figure 2 and Figure 3 As shown, the present invention provides a steel-aluminum composite spline shaft forging die, comprising an upper die 1, a lower die 2, and a punch 3. The upper die 1 is pressed onto the lower die 2, and an upper die sleeve 4 is fitted inside the upper die 1. A lower die sleeve 5 adapted to the steel spline shaft 100 is fitted inside the lower die 2, and an electric heating wire 6 is embedded in the lower die 2 to facilitate heating of the steel spline shaft 100.

[0029] The upper mold 1 of this utility model is provided with a punching hole 7, an aluminum tube 8 is built into the punching hole 7, and the upper mold sleeve 4 is set inside the punching hole 7 and is located at the lower part of the aluminum tube 8.

[0030] The punch 3 includes a sleeve 31, a core 32, and a spring 33. The core 32 is movably mounted inside the sleeve 31 via the spring 33. The core 32 and the sleeve 31 pass through the punching holes 7. An aluminum tube 8 is sleeved outside the core 32 and positioned between the punching holes 7. The sleeve 31 of this invention has a space 34 inside, and the bottom of the sleeve 31 is open and sealed by an end cap 35. The top of the core 32 passes through the sleeve 31, and the bottom of the core 32 is pressed against the spring 33, confining the core 32 within the space 34. A limiting step 36 is provided on the outer edge of the sleeve 31, and the limiting step 36 intermittently presses against the end face of the upper die 1.

[0031] During the stamping process, the steel spline shaft 100 is first preheated by the electric heating wire 6. The force of the punch 3 is applied to the sleeve 31. The spring 33 is first deformed and contracts. At this time, the core 32 is gradually inserted to the center position of the steel spline shaft 100. As the external force is continuously applied, the contraction resistance of the spring 33 increases, and the sleeve 31 moves downward, applying force to the aluminum tube 8, forcing the aluminum tube 8 to be squeezed into the space 34 between the lower die sleeve and the steel spline shaft 100, so that the two are joined.

[0032] It is worth noting that the lower mold 2 of this invention has a guide shaft 9 on the end face that contacts the upper mold 1, and the upper mold 1 has a guide groove 10 that is adapted to the guide shaft 9.

[0033] This utility model discloses a steel-aluminum composite spline shaft forging die. An electric heating wire 6 is embedded in the lower die 2 to heat the steel spline shaft 100 inside the lower die 2. Combined with the action of the spring 33 on the punch 3, when the punch 3 acts on the aluminum sleeve 8, the spring 33 reduces the action of the buffer head 3 and the aluminum tube 8, realizing the relative positioning of the end of the punch 3 and the steel spline shaft 100. When the spring 33 is further compressed, the sleeves 31 on both sides of the punch 3 act on the aluminum tube 8, pressing the aluminum tube 8 to combine with the steel spline shaft 100.

[0034] This utility model discloses a steel-aluminum composite spline shaft forging die, which has a simple structure and makes the stamping process more convenient and faster. It uses a preheated steel spline shaft 100 and a spring 33 to achieve two-stage pressure, so as to achieve pressure holding until the aluminum material completely fills the annular groove and spline teeth, thereby increasing the connection strength by 10%, with a production cycle of 120s / piece and a scrap rate of <0.5%.

[0035] This utility model discloses a steel-aluminum composite spline shaft forging die, which has a simple structure and makes the stamping process more convenient and faster.

[0036] Finally, the method described in this application is merely a preferred embodiment and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A steel-aluminum composite spline shaft swage die, characterized by, The device includes an upper die, a lower die, and a punch. The upper die is pressed onto the lower die, and an upper die sleeve is fitted inside the upper die. The lower die is fitted with a lower die sleeve adapted to a spline shaft, and an electric heating wire is embedded in the lower die. The upper die has a punching hole, the upper die sleeve is located below the punching hole, and the punch moves within the punching hole. An aluminum tube is installed within the punching hole.

2. The steel-aluminum composite spline shaft swaging die according to claim 1, wherein, The punch includes a sleeve, a core, and a spring. The core is movably mounted in the sleeve via the spring. The core and the sleeve pass through the punching holes. The aluminum tube is sleeved outside the core and positioned between the punching holes.

3. The steel-aluminum composite spline shaft swaging die according to claim 2, wherein The sleeve has a space inside, and the bottom of the sleeve is open and sealed by an end cap. The top of the core head passes through the sleeve, and the bottom of the core head presses against the spring, thus confining the core head within the space.

4. The steel-aluminum composite spline shaft swaging die according to claim 2, wherein The outer edge of the sleeve is provided with a limiting step, which intermittently presses against the end face of the upper mold.

5. The steel-aluminum composite spline shaft swaging die according to claim 1, wherein The lower mold has a guide shaft on the end face that contacts the upper mold, and the upper mold has a guide groove that matches the guide shaft.

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