Expansion forming die for aluminum pile casing

Abstract

The utility model discloses an expansion forming die for an aluminum pile casing. The expansion forming die comprises a top die, a bottom die and side dies, the top die and the bottom die are coaxially arranged up and down, the periphery of the top die is matched with the inner periphery of the upper end of a blank pipe material, the periphery of the bottom die is matched with the inner periphery of the lower end of the blank pipe material, and a liquid inlet is formed in the bottom die; the side die comprises a plurality of side plates, the side plates are arranged around the axis of the top die and define a laterally-closed cylindrical structure, the inner circumference of the upper end of the cylindrical structure is matched with the outer circumference of the upper end of the blank pipe and used for pressing the upper end of the blank pipe inwards to the top die, the inner circumference of the lower end of the cylindrical structure is matched with the outer circumference of the lower end of the blank pipe, and the middles of the side plates protrude outwards. And the middle of the side plate protrudes outwards, so that an annular protruding annular shaping groove used for shaping the aluminum protective cylinder is formed in the inner side of the cylindrical structure. The utility model provides an expansion forming die for an aluminum pile casing. The production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of aluminum casing production, in particular to an aluminum casing expansion forming die. Background Art

[0002] Aluminum casings are widely used in the technical field of vehicle air suspensions. Existing aluminum casings, such as Figure 3 , have a circular bulge 200 provided on the outer periphery of the middle part. The function of the aluminum casing is to define the boundary of the air spring, adjust the stiffness and stroke of the air spring, so that the air spring has better durability and more excellent performance. At present, aluminum casings are generally manufactured by stamping or spinning processes. Both of these methods require a large number of dies to make the final aluminum casing, resulting in high production and die costs. Content of the Utility Model

[0003] In order to solve the disadvantages of high production and die costs of existing aluminum casings, the utility model provides an aluminum casing expansion forming die to reduce production and die costs.

[0004] To achieve the above object, the utility model adopts the following technical scheme:

[0005] An aluminum casing expansion forming die includes: a top die, a bottom die and a side die; the top die and the bottom die are coaxially arranged up and down. The outer periphery of the top die is adapted to the inner periphery of the upper end of the blank tube, and the outer periphery of the bottom die is adapted to the inner periphery of the lower end of the blank tube. A liquid inlet is provided on the bottom die / top die; the side die includes a plurality of side plates. The plurality of side plates are arranged around the axis of the top die and enclose a laterally sealed cylindrical structure. The inner periphery of the upper end of the cylindrical structure is adapted to the outer periphery of the upper end of the blank tube and is used to press the upper end of the blank tube inward against the top die. The inner periphery of the lower end of the cylindrical structure is adapted to the outer periphery of the lower end of the blank tube. The middle part of the side plate bulges outward and is used to press the lower end of the blank tube inward against the bottom die. The middle part of the side plate bulges outward so that a circular shaping groove for shaping the circular bulge of the aluminum casing is formed inside the cylindrical structure.

[0006] Through the above settings, the blank tube can be expanded and formed into a die at one time by liquid pressure, reducing the number of dies and having high production efficiency.

[0007] Further, the number of side plates is two, and they are symmetrically arranged on the left and right sides of the top die and the bottom die.

[0008] Further, the upper side of the side plate is flush with the upper side of the top die, and the lower side of the bottom die is flush with the lower side of the side plate.

[0009] Further, an upper chamfer is provided on the outer periphery of the upper side of the bottom die, and a lower chamfer is provided on the outer periphery of the lower side of the top die.

[0010] Through the above settings, it is convenient to put the lower end of the blank tube on the bottom die and embed the top die into the upper end of the blank tube.

[0011] Further, an air extraction pipe is fixedly connected to the outside of one of the side plates, and the air extraction pipe is provided with an air passage penetrating to the inside of the side plate.

[0012] Through the above settings, after the blank pipe material expands, it can better fit with the annular shaping groove.

[0013] Further, the expansion forming die further includes a hole plugging assembly. The hole plugging assembly includes a baffle plate, a driving cylinder and a branch pipe. The side plate is provided with a receiving groove at the inner end of the air passage. The baffle plate is adapted to the receiving groove and is embedded in the receiving groove. The driving cylinder is installed at the outer end of the air extraction pipe and plugs the outer end of the air extraction pipe. The output shaft of the driving cylinder passes through the air extraction pipe and is connected to the baffle plate. The branch pipe is connected to the side of the air extraction pipe.

[0014] Through the above settings, the baffle plate can plug the inner end of the air passage to prevent the annular bulge formed by the blank pipe material from being uneven near the air passage. Description of the Drawings

[0015] Figure 1 It is a schematic diagram of the expansion forming die of the embodiment.

[0016] Figure 2 It is a cross-sectional view of the expansion forming die of the embodiment and the blank pipe material.

[0017] Figure 3 It is a schematic diagram of an existing aluminum casing. Detailed Embodiments

[0018] The technical solutions of the present invention will be further specifically described below through embodiments and in conjunction with the drawings.

[0019] See Figures 1 to 2 , an aluminum casing expansion forming die, including: a top die 2, a bottom die 3 and a side die 4; the top die 2 and the bottom die 3 are coaxially arranged up and down. The outer periphery of the top die 2 is adapted to the inner periphery of the upper end of the blank pipe material 5, and the outer periphery of the bottom die 3 is adapted to the inner periphery of the lower end of the blank pipe material 5. The bottom die 3 is provided with a liquid inlet 6; the side die 4 includes a plurality of side plates 41. The plurality of side plates 41 are arranged around the axis of the top die 2 and enclose a laterally sealed cylindrical structure. The inner periphery of the upper end of the cylindrical structure is adapted to the outer periphery of the upper end of the blank pipe material 5 and is used to press the upper end of the blank pipe material 5 inward against the top die 2. The inner periphery of the lower end of the cylindrical structure is adapted to the outer periphery of the lower end of the blank pipe material 5. The middle part of the side plate 41 bulges outward and is used to press the lower end of the blank pipe material 5 inward against the bottom die 3. The middle part of the side plate 41 bulges outward so that an annular shaping groove 42 for shaping the annular bulge of the aluminum casing is formed inside the cylindrical structure.

[0020] Through the above settings, the blank pipe material 5 can be formed into a die at one time by liquid pressure, reducing the die and having high production efficiency.

[0021] When the expansion forming die of the present application is in use, the lower end of the purchased blank pipe material 5 is sleeved on the bottom die 3. In actual production, the top die 2 is connected to the lifting device, and the lifting device drives the top die 2 to move downward and embed into the upper end of the blank pipe material 5. At this time, a sealed space is formed between the top die 2, the blank pipe material 5 and the bottom die 3. The side plate 41 is connected to an oil cylinder or other device and can move radially closer to or away from the blank pipe material 5. After the side plates 41 are closed, while forming a cylindrical structure, the upper end of the side plate 41 is in close contact with the upper end of the blank pipe material 5, and the lower end of the side plate 41 is in close contact with the lower end of the blank pipe material 5. There is a gap between the annular shaping groove 42 and the blank pipe material 5, and the inner wall of the annular shaping groove 42 is smooth, making the outer surface of the later finished aluminum protection cylinder smooth. High-pressure liquid (water or oil) is injected into the sealed space through the liquid inlet 6. Under the pressure of the liquid, the blank pipe material 5 expands, and the middle part of the blank pipe material 5 bulges outward and adheres to the annular shaping groove 42, forming an annular bulge. Finally, the side plates 41 are opened and separated from the blank pipe material 5, and the top die 2 rises upward and leaves the blank pipe material 5, and the finished aluminum protection cylinder is taken out from the bottom die 3.

[0022] As an implementation manner, the number of the side plates 41 is two, and they are symmetrically arranged on the left and right sides of the top die 2 and the bottom die 3.

[0023] As an implementation manner, the upper side of the side plate 41 is flush with the upper side of the top die 2, and the lower side of the bottom die 3 is flush with the lower side of the side plate 41.

[0024] As an implementation manner, an upper chamfer 31 is provided on the outer periphery of the upper side of the bottom die 3, and a lower chamfer 21 is provided on the outer periphery of the lower side of the top die 2.

[0025] Through the above settings, it is convenient to sleeve the lower end of the blank pipe material 5 on the bottom die 3 and embed the top die 2 into the upper end of the blank pipe material 5.

[0026] As an implementation manner, an air extraction pipe 7 is fixedly connected to the outside of one of the side plates 41, and the air extraction pipe 7 is provided with an air passage 71 penetrating to the inside of the side plate 41.

[0027] Through the above settings, the blank pipe material 5 can better fit with the annular shaping groove 42 after expansion.

[0028] Before injecting high-pressure liquid into the expansion forming die of the present application, the air in the annular shaping groove 42 is evacuated through the air extraction pipe 7 first. The internal high-pressure liquid extrudes the blank pipe material 5 outward, and the blank pipe material 5 has less resistance to outward expansion and can better adhere to the inner wall of the annular shaping groove 42, making the outer wall of the formed aluminum protection cylinder more standard.

[0029] As an implementation manner, the expansion forming die further includes a hole plugging component 8. The hole plugging component 8 includes a baffle 81, a driving cylinder 82 and a branch pipe 83. A receiving groove 43 is provided at the inner end of the air passage 71 on the side plate 41. The baffle 81 is adapted to the receiving groove 43 and is embedded in the receiving groove 43. The driving cylinder 82 is installed at the outer end of the air extraction pipe 7 and plugs the outer end of the air extraction pipe 7. The output shaft of the driving cylinder 82 passes through the air extraction pipe 7 and is connected to the baffle 81. The branch pipe 83 is connected to the side of the air extraction pipe 7.

[0030] With the above arrangement, the baffle 81 can plug the inner end of the air passage 71 to prevent the annular bulge formed by the blank tube 5 from being uneven near the air passage 71.

[0031] When the expansion forming die of the present application is exhausting, the driving cylinder 82 drives the baffle 81 to move inward. After the baffle 81 leaves the receiving groove 43, the air pump can extract the air in the annular shaping groove 42 through the branch pipe 83 and the air extraction pipe 7, so as to form a vacuum between the annular shaping groove 42 and the blank tube 5. After the driving cylinder 82 drives the baffle 81 to re-embed into the receiving groove 43, the baffle 81 plugs the inner end of the air passage 71 to prevent the outside air from entering the annular shaping groove 42 through the air passage 71. The inner side of the baffle 81 is flush with the notch of the receiving groove 43, that is, the inner side of the baffle 81 is connected to the inner wall of the annular shaping groove 42. After the blank tube 5 expands, the blank tube 5 fits on the annular shaping groove 42 and the baffle 81 to form an annular bulge.

[0032] It should be understood that for those of ordinary skill in the art, improvements or transformations can be made according to the above description, and all such improvements and transformations should fall within the protection scope of the appended claims of the present utility model.

Claims

1. An aluminum casing expansion forming die, characterized in that, Comprising: A top mold and a bottom mold, the top mold and the bottom mold are coaxially arranged up and down, the outer periphery of the top mold is adapted to the inner periphery of the upper end of the blank pipe, the outer periphery of the bottom mold is adapted to the inner periphery of the lower end of the blank pipe, and a liquid inlet is provided on the bottom mold / top mold; A side mold, the side mold includes a plurality of side plates, the plurality of side plates are arranged around the axis of the top mold and enclose a laterally sealed cylindrical structure, the inner periphery of the upper end of the cylindrical structure is adapted to the outer periphery of the upper end of the blank pipe and is used to press the upper end of the blank pipe inward against the top mold, the inner periphery of the lower end of the cylindrical structure is adapted to the outer periphery of the lower end of the blank pipe, the middle part of the side plate bulges outward and is used to press the lower end of the blank pipe inward against the bottom mold, and the middle part of the side plate bulges outward so that an annular shaping groove for shaping the annular bulge of the aluminum protection cylinder is formed inside the cylindrical structure.

2. The aluminum casing expansion forming die according to claim 1, characterized in that, The number of the side plates is two and they are symmetrically arranged on the left and right sides of the top mold and the bottom mold.

3. The aluminum casing expansion forming die according to claim 1, wherein, The upper side of the side plate is flush with the upper side of the top mold, and the lower side of the bottom mold is flush with the lower side of the side plate.

4. The aluminum casing expansion forming die according to claim 1, wherein, An upper chamfer is provided on the outer periphery of the upper side of the bottom mold, and a lower chamfer is provided on the outer periphery of the lower side of the top mold.

5. The aluminum casing expansion forming die according to claim 1, characterized in that, An air extraction pipe is fixedly connected to the outside of one of the side plates, and the air extraction pipe is provided with an air passage penetrating to the inside of the side plate.

6. The aluminum casing expansion forming die according to claim 5, characterized in that, The expansion forming die further includes a hole plugging assembly, the hole plugging assembly includes a baffle plate, a driving cylinder and a branch pipe, a receiving groove is provided on the side plate at the inner end of the air passage, the baffle plate is adapted to the receiving groove and is embedded in the receiving groove, the driving cylinder is installed at the outer end of the air extraction pipe and plugs the outer end of the air extraction pipe, the output shaft of the driving cylinder passes through the air extraction pipe and is connected to the baffle plate, and the branch pipe is connected to the side of the air extraction pipe.

Images