Rotary forging dies and rotary forging machines

Abstract

The present invention relates to a rotary swaging die and a rotary swaging machine, wherein the rotary swaging die comprises: a plurality of die units, which are arranged circumferentially and enclose a rotary swaging cavity, wherein the rotary swaging cavity comprises a bite section, a diameter-changing section, a sizing section and an outlet section arranged in sequence, wherein in the direction from the bite section to the outlet section, the inner diameter of the diameter-changing section gradually decreases, and the inner diameter of the sizing section is constant, and within a projection orthogonal to the axial direction of the rotary swaging cavity, the outer peripheral contour of the diameter-changing section is an ellipse, and the outer peripheral contour of the sizing section is a circle. The rotary swaging die of the present invention is conducive to improving the quality of rotary swaging products after rotary swaging.

Description

Technical Field

[0001] The invention relates to the technical field of material processing, in particular to a rotary forging die and a rotary forging machine. Background Art

[0002] Rotary forging is one of the important methods of bar processing. It is widely used because of its small equipment investment and relatively low process requirements. At present, in the process of rotary forging of bars, there are problems such as poor universal matching of rotary forging dies, poor surface quality and straightness of the product after rotary forging, and large loss of rotary forging dies. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, an embodiment of the present invention provides a rotary forging die, which is beneficial to improving the quality of rotary forging products.

[0005] An embodiment of the present invention further provides a rotary forging machine.

[0006] The rotary swaging die of an embodiment of the present invention comprises: a plurality of die units, which are circumferentially arranged and surround a rotary swaging cavity, wherein the rotary swaging cavity comprises a biting section, a reducing section, a sizing section and an outlet section arranged in sequence, wherein in the direction from the biting section to the outlet section, the inner diameter of the reducing section gradually decreases, and the inner diameter of the sizing section is constant, and within a projection orthogonal to the axial direction of the rotary swaging cavity, the outer peripheral contour of the reducing section is an ellipse, and the outer peripheral contour of the sizing section is a circle.

[0007] According to the rotary forging die of the embodiment of the present invention, the pipe and rod to be rotary forged can enter the rotary forging cavity through the biting section, and under the extrusion of multiple die units, the product to be rotary forged passes through the reducing section and the sizing section in sequence for rotary forging, and then is discharged from the outlet section. Since the outer peripheral contour of the reducing section is elliptical, the pipe and rod can be fully forged in the reducing section, which is conducive to improving the quality of the pipe and rod after forging, so that the pipe and rod can be fully deformed, and since the inner diameter of the sizing section is constant, the pipe and rod can be rotary forged into a cylindrical shape, and after forging in the sizing section, the size, surface and structure of the pipe and rod can be guaranteed, thereby improving the quality of the rotary forging product.

[0008] In some embodiments, in the direction from the bite section to the outlet section, the slope of the tangent line tangent to the wall surface of the diameter-changing section gradually decreases.

[0009] In some embodiments, the inner diameter of the biting section is greater than the inner diameter of the diameter-changing section, and the inner diameter of the biting section gradually decreases in the direction from the biting section to the outlet section.

[0010] In some embodiments, the inner diameter of the outlet section is larger than the inner diameter of the sizing section, and the inner diameter of the outlet section gradually increases in a direction from the biting section to the outlet section.

[0011] In some embodiments, the rotary forging chamber also includes a transition section, which is arranged between the biting section and the variable diameter section. In the direction from the biting section to the outlet section, the inner diameter of the transition section gradually decreases, and the inner wall of the transition section is smoothly transitionally connected to the inner wall of the variable diameter section and the inner wall of the fixed diameter section.

[0012] In some embodiments, the axial length of the rotary forging cavity is L1, the axial length of the diameter-reducing section is L2, and 0.45≤L2 / L1≤0.55.

[0013] In some embodiments, the axial length of the transition section is L3, 0.15≤L3 / L1≤0.25.

[0014] In some embodiments, the axial length of the sizing section is L4, 0.25≤L4 / L1≤0.35.

[0015] In some embodiments, the axial lengths of the bite section and the outlet section are both L5, 3mm≤L5≤5mm.

[0016] A rotary swaging machine according to another embodiment of the present invention comprises the rotary swaging die described in any one of the embodiments of the present invention.

[0017] According to the rotary forging machine of the embodiment of the present invention, the pipe and rod to be rotary forged can enter the rotary forging cavity through the biting section, and under the extrusion of multiple die units, the product to be rotary forged passes through the reducing section and the sizing section in sequence for rotary forging, and then is discharged from the outlet section. Since the outer peripheral contour of the reducing section is elliptical, the pipe and rod can be fully forged in the reducing section, which is conducive to improving the quality of the pipe and rod after forging, so that the pipe and rod can be fully deformed, and since the inner diameter of the sizing section is constant, the pipe and rod can be rotary forged into a cylindrical shape, and after forging in the sizing section, the size, surface and structure of the pipe and rod can be guaranteed, thereby improving the quality of the rotary forging product. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a longitudinal sectional view of a rotary forging die according to an embodiment of the present invention.

[0019] Figure 2 It is a cross-sectional view of the reducing section of the rotary forging die according to an embodiment of the present invention.

[0020] Figure 3 It is a cross-sectional view showing the position of the sizing section of the rotary forging die according to an embodiment of the present invention.

[0021] Reference numerals:

[0022] 1. Mould unit;

[0023] 2. Rotary forging cavity; 21. Biting section; 22. Variable diameter section; 23. Fixed diameter section; 24. Exit section; 25. Transition section. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0025] Please refer to the following Figures 1 to 3 A rotary swaging die and a rotary swaging machine according to an embodiment of the present invention are described.

[0026] like Figures 1 to 3 As shown, the rotary forging die of the embodiment of the present invention includes a plurality of die units 1, which are circumferentially arranged and surround a rotary forging cavity 2. The rotary forging cavity 2 includes a biting section 21, a reducing section 22, a sizing section 23 and an outlet section 24 which are arranged in sequence. In the direction from the biting section 21 to the outlet section 24, the inner diameter of the reducing section 22 gradually decreases, and the inner diameter of the sizing section 23 is constant. In the projection orthogonal to the axial direction of the rotary forging cavity 2, the outer peripheral contour of the reducing section 22 is elliptical, and the outer peripheral contour of the sizing section 23 is circular.

[0027] According to the rotary forging die of the embodiment of the present invention, the pipe and rod to be rotary forged can enter the rotary forging cavity 2 through the bite section 21, and under the extrusion of the multiple die units 1, the product to be rotary forged passes through the reducing section 22 and the sizing section 23 in sequence for rotary forging, and then is discharged from the outlet section 24. Since the outer peripheral contour of the reducing section 22 is an ellipse, the pipe and rod can be fully forged in the reducing section 22, which is conducive to improving the quality of the pipe and rod after forging, so that the pipe and rod can be fully deformed, and since the inner diameter of the sizing section 23 is constant, the pipe and rod can be rotary forged into a cylindrical shape, and after being forged by the sizing section 23, the size, surface and structure of the pipe and rod can be guaranteed, thereby improving the quality of the rotary forging product.

[0028] It should be noted that the minor axis size of the ellipse of the diameter reducing section 22 is larger than the inner diameter of the sizing section 23, so that the tube and rod material gradually transitions from an ellipse to a circle, thereby improving the forging quality of the rotary forging product. The inventor of the present application has found through experimental research that when the cross section of the diameter reducing section 22 is an ellipse, the forging surface of the rotary forging product can also be an ellipse, thereby effectively dispersing the forging force, which is conducive to the full deformation of the metal, improves the uniformity and consistency of the rotary forging product, ensures the relevant quality of the product size, surface and structure, and improves the service life of the mold.

[0029] Alternatively, if Figure 1As shown, in the direction from the bite section 21 to the outlet section 24, the slope of the tangent line tangent to the wall surface of the diameter reducing section 22 gradually decreases. In other words, the profile of the longitudinal section of the diameter reducing section 22 is a curve, and the line tangent to the curve is the tangent of the curve. That is, in the direction from the bite section 21 to the outlet section 24, the curvature of the curved profile of the diameter reducing section 22 gradually decreases, thereby making the diameter reduction amount basically consistent with the diameter reduction process of rotary forging, which can effectively disperse the forging force and improve the forging quality of the rotary forging product.

[0030] In some embodiments, Figure 1 As shown, the inner diameter of the biting section 21 is larger than the inner diameter of the reducing section 22, and the inner diameter of the biting section 21 gradually decreases in the direction from the biting section 21 to the outlet section 24. It can be understood that the aperture of the biting section 21 is larger than the aperture of the reducing section 22, which can facilitate the tube and rod (rotary forging product) to smoothly enter the reducing section 22. Since the inner diameter of the biting section 21 gradually decreases in the direction from the biting section 21 to the outlet section 24, the biting section 21 can be generally trumpet-shaped, which is conducive to the tube and rod smoothly entering the reducing section 22 of the rotary forging die, avoiding the problem of collision of the tube and rod (rotary forging product).

[0031] Alternatively, if Figure 1 As shown, the inner diameter of the outlet section 24 is larger than the inner diameter of the sizing section 23, and the inner diameter of the outlet section 24 gradually increases in the direction from the biting section 21 to the outlet section 24. It can be understood that the outlet section 24 mainly plays a transitional role to avoid the problem of the tube bar (rotary forging product) colliding with the rotary forging die when being discharged, so as to protect both the material and the die, increase the service life of the rotary forging die, and improve the rotary forging quality of the tube rotary forging product.

[0032] Alternatively, if Figure 1 As shown, the rotary forging cavity 2 also includes a transition section 25, which is arranged between the biting section 21 and the diameter-changing section 22. In the direction from the biting section 21 to the outlet section 24, the inner diameter of the transition section 25 gradually decreases, and the inner wall of the transition section 25 is smoothly transitioned to the inner wall of the diameter-changing section 22 and the inner wall of the sizing section 23. The rotary forging die of the embodiment of the present application can smoothly transition the diameter-changing section 22 and the sizing section 23 by setting the transition section 25, so that the deformation of the tube and bar (rotary forging product) is gradually reduced, and the entire forging process tends to be a relatively gentle and continuous process, thereby effectively improving or avoiding the appearance of inferior products.

[0033] Optionally, the die unit 1 is made of cold working die steel, and the inner wall of the reducing section 22 and the inner wall of the sizing section 23 are nitrided, thereby reducing the production cost of the rotary forging die, simplifying the processing and manufacturing, and helping to increase the service life of the die.

[0034] In some embodiments, Figure 1As shown, the axial length of the rotary forging cavity 2 is L1, the axial length of the diameter reducing section 22 is L2, and 0.45≤L2 / L1≤0.55. For example, L2 / L1 can be 0.45, 0.47, 0.5, 0.53, 0.55. Preferably, L2 / L1 is 0.5, that is, the length of the diameter reducing section 22 accounts for half of the length of the entire rotary forging cavity 2.

[0035] The inventors of the present application have discovered through experimental research that when the length of the variable diameter section 22 is within the above parameter range, the forging force can be effectively dispersed, which can not only fully deform the rotary forging product, but also improve the uniformity and consistency of the rotary forging product, ensure the relevant qualities such as product size, surface and structure, and increase the service life of the mold.

[0036] Furthermore, if Figure 1 As shown, the axial length of the transition section 25 is L3, 0.15≤L3 / L1≤0.25. For example, the length of the transition section 25 can be 0.15, 0.17, 0.2, 0.22, 0.25. Preferably, L3 / L1 is 0.2, that is, the length of the transition section 25 accounts for one fifth of the length of the entire rotary forging chamber 2. The inventors of the present application have found through experimental research that when the length proportion of the transition section 25 is within the above parameter range, a smoother transition can be made to the reducing section 22 and the sizing section 23, so that the deformation of the tube and rod (rotary forging product) is gradually reduced, and the entire forging process tends to be a relatively gentle and continuous process, effectively improving or avoiding the appearance of poor products.

[0037] Furthermore, if Figure 1 As shown, the axial length of the sizing section 23 is L4, 0.25≤L4 / L1≤0.35. For example, the length of the sizing section 23 can be 0.25, 0.27, 0.3, 0.32, 0.35. Preferably, L4 / L1 is 0.3. In this way, the tube and bar can be rotary forged into a regular cylindrical shape, and after forging the sizing section 23, the size, surface, structure and other related qualities of the tube and bar can be guaranteed, thereby improving the quality of the rotary forged product.

[0038] Alternatively, if Figure 1 As shown, the axial lengths of the bite section 21 and the outlet section 24 are both L5, 3mm≤L5≤5mm. For example, L5 can be 3mm, 4mm, or 5mm. The rotary forging die of the embodiment of the present invention adopts the above range for the bite section 21, which is conducive to the tube and bar material to smoothly and smoothly enter the diameter-changing section 22 of the rotary forging die, avoiding the problem of collision of the tube and bar material (rotary forging product).

[0039] The rotary forging die of the embodiment of the present invention adopts the above-mentioned range for the outlet section 24, which can avoid the problem of the tube and rod (rotary forging product) colliding with the rotary forging die during discharge, thereby protecting both the material and the die, increasing the service life of the rotary forging die, and improving the rotary forging quality of the tube rotary forging product.

[0040] A rotary forging machine according to another embodiment of the present invention comprises a rotary forging die and a driving device according to an embodiment of the present invention, wherein the driving device is used to drive a plurality of die units 1 to move radially along a rotary forging cavity 2 so as to move the plurality of die units 1 closer to and farther from each other, thereby realizing the rotary forging process of tubes and bars.

[0041] According to the rotary forging machine of the embodiment of the present invention, the pipe and rod to be rotary forged can enter the rotary forging cavity 2 through the biting section 21, and under the extrusion of the multiple die units 1, the product to be rotary forged passes through the reducing section 22 and the sizing section 23 in sequence for rotary forging, and then is discharged from the outlet section 24. Since the outer peripheral contour of the reducing section 22 is an ellipse, the pipe and rod can be fully forged in the reducing section 22, which is conducive to improving the quality of the pipe and rod after forging, so that the pipe and rod can be fully deformed, and since the inner diameter of the sizing section 23 is constant, the pipe and rod can be rotary forged into a cylindrical shape, and after being forged by the sizing section 23, the size, surface and structure of the pipe and rod can be guaranteed, thereby improving the quality of the rotary forging product.

[0042] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0043] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0044] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0046] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0047] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A rotary forging die, characterized in that: The invention comprises a plurality of die units which are arranged circumferentially and enclose a rotary forging cavity. The rotary forging cavity comprises a biting section, a diameter-changing section, a sizing section and an outlet section which are arranged in sequence. In the direction from the biting section to the outlet section, the inner diameter of the diameter-changing section gradually decreases, and the inner diameter of the sizing section is constant. In the projection orthogonal to the axial direction of the rotary forging cavity, the outer peripheral contour of the diameter-changing section is elliptical, and the outer peripheral contour of the sizing section is circular.

2. The rotary forging die according to claim 1, characterized in that: In the direction from the biting section to the outlet section, the slope of the tangent line tangent to the wall surface of the diameter-changing section gradually decreases.

3. The rotary forging die according to claim 1, characterized in that: The inner diameter of the biting section is greater than the inner diameter of the diameter-changing section, and the inner diameter of the biting section gradually decreases in the direction from the biting section to the outlet section.

4. The rotary forging die according to claim 1, characterized in that: The inner diameter of the outlet section is greater than the inner diameter of the sizing section, and the inner diameter of the outlet section gradually increases in a direction from the biting section to the outlet section.

5. The rotary forging die according to claim 1, characterized in that: The rotary forging chamber also includes a transition section, which is arranged between the biting section and the variable diameter section. In the direction from the biting section to the outlet section, the inner diameter of the transition section gradually decreases, and the inner wall of the transition section is smoothly transitionally connected to the inner wall of the variable diameter section and the inner wall of the fixed diameter section.

6. The rotary forging die according to claim 5, characterized in that: The axial length of the rotary forging cavity is L1, the axial length of the diameter-changing section is L2, and 0.45≤L2 / L1≤0.

55.

7. The rotary forging die according to claim 6, characterized in that: The axial length of the transition section is L3, 0.15≤L3 / L1≤0.

25.

8. The rotary forging die according to claim 6, characterized in that: The axial length of the sizing section is L4, 0.25≤L4 / L1≤0.

35.

9. The rotary forging die according to any one of claims 1 to 8, characterized in that: The axial lengths of the biting section and the outlet section are both L5, 3mm≤L5≤5mm.

10. A rotary forging machine, characterized in that: The rotary forging die comprises the rotary forging die according to any one of claims 1 to 9.

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