CN114289629A - Method for forming rim - Google Patents
Method for forming rim Download PDFInfo
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- CN114289629A CN114289629A CN202111679024.0A CN202111679024A CN114289629A CN 114289629 A CN114289629 A CN 114289629A CN 202111679024 A CN202111679024 A CN 202111679024A CN 114289629 A CN114289629 A CN 114289629A
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Abstract
The invention provides a method for molding a rim, which comprises the steps of placing a cylindrical rim base material in an accommodating cavity of a molding die and sealing the accommodating cavity; introducing high-temperature gas into the accommodating cavity to preheat the rim base material; introducing high-pressure gas into the accommodating cavity to enable the rim base material to expand in a high-pressure environment and cling to at least one mold core of the forming mold so as to complete the thermal forming of the outer peripheral surface of the rim base material; and after the outer peripheral surface of the rim base material is molded, stopping introducing high-pressure gas into the accommodating cavity, and continuously introducing cooling liquid into the overflowing cavity of the molding die to cool the molding die and the molded rim base material. The invention solves the problems that the technical process of the wheel rim in the prior art is more complicated and the processing and manufacturing efficiency of the wheel rim cannot be ensured.
Description
Technical Field
The invention relates to the technical field of processing and manufacturing of rims, in particular to a rim forming method.
Background
In the prior art, a method for manufacturing a rim generally includes the steps of rolling a plate-shaped blank to form a cylindrical rim base material, then performing flaring operation on the rim base material, and rolling and forming the outer peripheral surface of the rim base material subjected to the flaring operation by using a roller forming machine.
Disclosure of Invention
The invention mainly aims to provide a rim forming method to solve the problems that a rim craftsman in the prior art is complicated in process and cannot ensure the processing and manufacturing efficiency of the rim.
In order to achieve the purpose, the invention provides a method for molding a rim, which comprises the steps of placing a cylindrical rim base material into a containing cavity of a molding die and sealing the containing cavity; introducing high-temperature gas into the accommodating cavity to preheat the rim base material; introducing high-pressure gas into the accommodating cavity to enable the rim base material to expand in a high-pressure environment and cling to at least one mold core of the forming mold so as to complete the thermal forming of the outer peripheral surface of the rim base material; and after the outer peripheral surface of the rim base material is molded, stopping introducing high-pressure gas into the accommodating cavity, and continuously introducing cooling liquid into the overflowing cavity of the molding die to cool the molding die and the molded rim base material.
Further, the heating time period for introducing the high-temperature gas is t1, wherein t1 is more than or equal to 3min and less than or equal to 10 min.
Further, the rim substrate is preheated to a first temperature T1, wherein T1 is more than or equal to 900 ℃ and less than or equal to 950 ℃.
Furthermore, the pressure of the high-pressure gas introduced into the accommodating cavity is P1, wherein P1 is more than or equal to 5MPa and less than or equal to 20 MPa.
Further, the second temperature of the cooling liquid introduced into the overflowing cavity is T2, wherein the temperature is more than or equal to 3 ℃ and less than or equal to T2 and less than or equal to 10 ℃.
Further, the flow rate of the cooling liquid is Q, wherein 20m3/min≤Q≤100m3/min。
Further, the pressure of the cooling liquid is P2, wherein, P2 is more than or equal to 3MPa and less than or equal to 10 MPa.
Further, cooling liquid is introduced into the accommodating cavity, so that the formed rim base material is cooled to a third temperature T3, wherein T3 is less than or equal to 250 ℃.
Further, the cooling time of the formed rim base material is t2, wherein t2 is less than or equal to 8s and less than or equal to 15 s.
Further, after the formed rim base materials are cooled to the third temperature T3, the cutting between the adjacent two formed rim base materials is performed by the laser to complete the forming of at least two rims at a time.
By applying the technical scheme of the invention, the cylindrical rim base material is placed in the accommodating cavity of the forming die and the accommodating cavity is closed; introducing high-temperature gas into the accommodating cavity to preheat the rim base material; introducing high-pressure gas into the accommodating cavity to enable the rim base material to expand in a high-pressure environment and cling to at least one mold core of the forming mold so as to complete the thermal forming of the outer peripheral surface of the rim base material; after the outer peripheral surface of the rim base material is formed, stopping introducing high-pressure gas into the containing cavity, continuously introducing cooling liquid into the overflowing cavity of the forming die, in addition, compared with the prior fussy process from a flaring process to a rolling process and then to a finishing process, the method only needs the forming die for inner high-pressure hot forming to finish the hot forming process of the rim, greatly reduces processing equipment, and simultaneously improves the forming efficiency of the rim, in addition, the rim produced by the forming die provided by the application has the structural strength far greater than that of the rim formed by the conventional process, and the reduction rate in the rim forming process is effectively controlled.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 shows a schematic flow diagram of a method of forming a rim according to an alternative embodiment of the invention;
fig. 2 shows a schematic structural diagram of a forming die for manufacturing a wheel rim according to an alternative embodiment of the invention.
Wherein the figures include the following reference numerals:
1. a rim base material; 10. a base; 20. forming a structure; 21. an accommodating chamber; 211. a core; 22. forming a block; 23. a flow-through chamber; 24. a coolant inlet; 25. a coolant outlet; 30. and sealing the end cover.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a rim forming method, aiming at solving the problems that a rim craftsman process in the prior art is complicated and fussy and cannot ensure the processing and manufacturing efficiency of a rim.
As shown in fig. 1, the method for molding a rim includes placing a cylindrical rim base material 1 in a receiving cavity 21 of a molding die and closing the receiving cavity 21; introducing high-pressure gas into the accommodating cavity 21 so that the rim base material 1 is expanded in a high-pressure environment and is tightly attached to at least one core 211 of the forming mold to complete the thermal forming of the outer peripheral surface of the rim base material 1; after the outer peripheral surface of the rim base material 1 is molded, the introduction of the high-pressure gas into the accommodating cavity 21 is stopped, and the cooling liquid is continuously introduced into the flow passage cavity 23 of the molding die, so that the molding die and the molded rim base material 1 are cooled.
Placing the cylindrical rim base material 1 into a containing cavity 21 of a forming die and closing the containing cavity 21; introducing high-temperature gas into the accommodating cavity 21 to preheat the rim base material 1; introducing high-pressure gas into the accommodating cavity 21 so that the rim base material 1 is expanded in a high-pressure environment and is tightly attached to at least one core 211 of the forming mold to complete the thermal forming of the outer peripheral surface of the rim base material 1; after the outer peripheral surface of the rim base material 1 is formed, stopping introducing high-pressure gas into the accommodating cavity 21, continuously introducing cooling liquid into the overflowing cavity of the forming die, in addition, compared with the prior fussy process from a flaring process to a rolling process and then to a finishing process, the method only needs the forming die for inner high-pressure hot forming to finish the hot forming process of the rim, greatly reduces processing equipment, and simultaneously improves the efficiency of rim forming, in addition, the rim produced by the forming die provided by the application has the structural strength far greater than that of the rim formed by the conventional process, and the reduction rate in the rim forming process is effectively controlled.
Optionally, the heating time period for introducing the high-temperature gas is t1, wherein t1 is less than or equal to 3min and less than or equal to 10 min. Like this, through optimizing the length of heating t1 that lets in high-temperature gas, ensure to let in the high-temperature gas that holds in the chamber 21 and can carry out effective heating to rim substrate 1, ensure that rim substrate 1 can reach the required temperature of predetermineeing of thermoforming.
Of course, the heating time period t1 for introducing the high-temperature gas varies according to the material and thickness of the rim substrate 1.
Optionally, the rim substrate 1 is preheated to a first temperature T1, wherein T1 is 900 ℃ to 950 ℃. In this way, by optimizing the first temperature T1, the flow reliability of the material of the rim base material 1 after the preheating is ensured, thereby facilitating the subsequent thermoforming.
Optionally, the pressure of the high-pressure gas introduced into the accommodating cavity 21 is P1, wherein P1 is more than or equal to 5MPa and less than or equal to 20 MPa. In this way, by optimizing the pressure P1 of the high-pressure gas introduced into the housing cavity 21, it is ensured that the outer circumferential surface of the rim base material 1 can be expanded in a high-pressure environment and attached to the core 211, and since the core 211 is provided in a convex manner, the molding is completed in the process of expanding the outer circumferential surface of the rim base material 1.
Alternatively, the high pressure gas may be an inert gas, such as argon.
Optionally, the second temperature of the cooling liquid introduced into the flow-passing cavity 23 is T2, wherein T2 is more than or equal to 3 ℃ and less than or equal to 10 ℃. In this way, by optimizing the second temperature T2 of the coolant flowing into the flow passage cavity, the coolant is ensured to have an effective heat exchange effect with the molding die, so that the effective cooling effect on the rim base material 1 is achieved.
Optionally, the flow rate of the cooling liquid is Q, wherein 20m3/min≤Q≤100m3And/min. In this way, it is ensured that the coolant continuously and continuously flowing through the flow cavity 23 can be discharged from the flow cavity 23 after the heat exchange with the molding die is completed, and new coolant flows in for heat exchange again, the temperature of the molding die is reduced, and simultaneously, the core 211 of the molding die and the rim base material 1 perform heat exchange until the rim base material 1 is cooled to the third temperature T3, and by optimizing the flow Q of the coolant, the waste of the coolant is avoided while ensuring that the rim base material 1 can be effectively cooled.
Optionally, the pressure of the cooling liquid is P2, wherein, the pressure is more than or equal to 3MPa and less than or equal to P2 and less than or equal to 10 MPa.
Optionally, a cooling liquid is introduced into the accommodating cavity 21 to cool the formed rim base material 1 to a third temperature T3, wherein T3 is less than or equal to 250 ℃. In this way, the material of the rim base material 1 after cooling is ensured to be converted from ferrite to a martensite structure, that is, the material strength of the rim base material 1 is increased from the tensile strength of 400MPa when it is formed into a cylindrical shape to 1300MPa or more.
Optionally, the cooling time of the formed rim base material 1 is t2, wherein t2 is less than or equal to 8s and less than or equal to 15 s.
In the present application, after the formed rim base materials 1 are cooled to the third temperature T3, the two adjacent formed rim base materials 1 are cut by laser to complete the forming of at least two rims at a time.
As shown in fig. 2, the forming die for manufacturing the rim comprises a base 10, a forming structure 20, a sealing end cover 30 and an inflation pipeline, wherein the forming structure 20 is connected with the base 10, the forming structure 20 is provided with a containing cavity 21 for containing the cylindrical rim base material 1, and a mold core 211 for forming the outer peripheral surface of the rim base material 1 is convexly arranged on the cavity wall surface of the containing cavity 21; the sealing end cover 30 is covered at the cavity opening of the accommodating cavity 21 to close the accommodating cavity 21; one end of the inflation pipeline is communicated with the containing cavity 21, and the other end of the inflation pipeline is communicated with an external high-pressure air source.
Through the rim substrate 1 that will be the tube-shape arrange in the chamber 21 that holds of forming structure 20, and hold chamber 21 with end cover 30 closure, the rethread inflation pipeline fills into high-pressure gas in holding chamber 21, make the rim substrate 1 that holds in the chamber 21 expand in high-pressure environment, and the outer peripheral face of rim substrate 1 hugs closely with core 211 and realizes thermoforming, comparatively convenient and fast in the whole technological process, and required equipment is less, furthermore, the structural strength of the rim that the forming die that produces through this application is greater than the structural strength of the rim that produces through current conventional technology far away, and the attenuate rate in the rim forming process has also obtained effective control.
In the present application, the rim substrate 1 is preheated by introducing high-temperature gas for 3 to 10 minutes before introducing high-pressure gas into the accommodating chamber 21.
Of course, the rim base material 1 may be preheated on other heating equipment, and the preheated rim base material 1 may be placed in the accommodating chamber 21.
It should be noted that, in the present application, the forming structure 20 is annular, and the annular forming structure 20 includes at least two forming blocks 22, each forming block 22 is movably connected to the base 10, so that each forming block 22 has an operating position moving radially inward along the forming structure 20 to enclose the accommodating cavity 21, and each forming block 22 has an avoiding position moving radially outward along the forming structure 20 to avoid the rim substrate 1. In this way, by moving each molding block 22 to the escape position, an operation space is reserved for mounting the cylindrical rim base material 1, and the mounting convenience of the cylindrical rim base material 1 is ensured.
As shown in fig. 2, the forming structure 20 includes two forming blocks 22, and each of the two forming blocks 22 has a semicircular ring shape.
It should be noted that, in the present application, considering that the molding structure 20 includes at least two molding blocks 22, that is, both axial ends of the accommodating cavity 21 are open, in order to ensure the sealing reliability of the accommodating cavity 21, as shown in fig. 2, two sealing end covers 30 are provided, and the two sealing end covers 30 are respectively disposed at the cavity openings at both axial ends of the molding structure 20. In this way, the two sealing end covers 30 can be ensured to effectively seal the accommodating cavity 21, so that the high-pressure gas filled subsequently cannot leak.
As shown in fig. 2, the core 211 is plural, and the plural cores 211 are provided at intervals in the axial direction of the molding structure 20. Thus, the outer peripheral surfaces of the plurality of rims can be formed at one time by the forming die, and after the thermal forming of the outer peripheral surfaces of the rims is finished, the rims are cut through laser so as to finish the thermal forming of the plurality of rims at one time.
Alternatively, the profile of each core 211 is the same. Thus, the thermal forming of the outer peripheral surfaces of a plurality of rims of the same type can be realized at one time by the forming die.
Of course, the outer contour of at least one of the plurality of cores 211 is different from the outer contour of the remaining cores 211. Like this, ensure that forming die can once only realize the thermoforming of the outer peripheral face of a plurality of rims of different models, promoted forming die's application scope greatly.
As shown in fig. 2, the molding structure 20 has an overflow cavity 23, and a coolant inlet 24 and a coolant outlet 25 communicating with the overflow cavity 23, wherein the coolant inlet 24 communicates with an external coolant source, and the coolant outlet 25 communicates with an external drain line. Thus, after the outer peripheral surface of the rim is subjected to thermoforming, the cooling liquid is continuously introduced into the overflowing cavity 23, so that the cooling liquid can exchange heat with the forming structure 20 in time, and the outer peripheral surface of the rim is attached to the mold core 211 and exchanges heat with the rim, so that the purpose of cooling the rim is achieved, the material of the rim is converted from ferrite into a martensite structure, and the material strength of the rim is increased to 1300MPa or above from 400MPa when the rim base material 1 is used.
Optionally, the flow-through cavity 23 is arranged along the axial extension of the forming structure 20. In this way, it is ensured that the cooling fluid passing through the flow-through chamber 23 can take away the heat from the forming structure 20 in a timely manner.
Optionally, the flow-passing cavities 23 are multiple, the multiple flow-passing cavities 23 are arranged at intervals in the circumferential direction of the forming structure 20, the cooling liquid inlets 24 and the cooling liquid outlets 25 are multiple, and the multiple cooling liquid inlets 24 and the multiple cooling liquid outlets 25 are all arranged in one-to-one correspondence with the multiple flow-passing cavities 23. Thus, the overflowing cavities 23 can be distributed over the outer peripheral surface of the formed rim as much as possible, and the flowing cooling liquid continuously filled into the overflowing cavities 23 can be effectively subjected to heat exchange with the formed rim, namely, the heat exchange area is increased.
Alternatively, the flow-through cavity 23 extends in the axial direction of the molding structure 20 while extending in the circumferential direction of the molding structure 20. In this way, the flow-through cavity 23 on the same forming block 22 is ensured to be a complete one, and the heat exchange area is increased, so that the cooling liquid can be ensured to carry out effective heat exchange with the formed wheel rim.
The flow-through cavities 23 are all provided in the forming block 22.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method of forming a rim, comprising:
placing a cylindrical rim base material (1) into a containing cavity (21) of a forming die and closing the containing cavity (21);
introducing high-temperature gas into the accommodating cavity (21) to preheat the rim base material (1);
introducing high-pressure gas into the accommodating cavity (21) so that the rim base material (1) is expanded in a high-pressure environment and is tightly attached to at least one core (211) of the forming mold to complete the hot forming of the outer peripheral surface of the rim base material (1);
and after the outer peripheral surface of the rim base material (1) is molded, stopping introducing high-pressure gas into the accommodating cavity (21), and continuously introducing cooling liquid into the overflowing cavity (23) of the molding die to cool the molding die and the molded rim base material (1).
2. The method for molding a rim according to claim 1, wherein the heating time of the high-temperature gas is t1, wherein t1 is 3min to 10 min.
3. The method for forming a rim according to claim 1, characterized in that the rim substrate (1) is preheated to a first temperature T1, wherein T1 is 900 ℃ to 950 ℃.
4. The method of claim 1, wherein the pressure of the high-pressure gas introduced into the receiving chamber (21) is P1, wherein P1 is 5MPa or more and 20MPa or less.
5. The method for forming a wheel rim as claimed in claim 1, wherein the second temperature of the cooling liquid introduced into the flow-through chamber (23) is T2, wherein T2 is 3 ℃ to 10 ℃.
6. The method of claim 1, wherein the flow rate of the cooling fluid is Q, and 20m of the flow rate is3/min≤Q≤100m3/min。
7. The method of claim 1, wherein the pressure of the coolant is P2, wherein P2 is 3MPa 10 MPa.
8. The method for forming a rim according to claim 1, wherein the cooling liquid is introduced into the receiving cavity (21) to cool the formed rim substrate (1) to a third temperature T3, wherein T3 is less than or equal to 250 ℃.
9. The method of molding a rim according to claim 1, wherein the cooling time of the molded rim base material (1) is t2, where 8s ≦ t2 ≦ 15 s.
10. The method for forming a rim according to claim 8, wherein after the formed rim base materials (1) are cooled to a third temperature T3, cutting is performed between two adjacent formed rim base materials (1) by laser to complete forming of at least two rims at a time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111679024.0A CN114289629A (en) | 2021-12-31 | 2021-12-31 | Method for forming rim |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111679024.0A CN114289629A (en) | 2021-12-31 | 2021-12-31 | Method for forming rim |
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| CN114289629A true CN114289629A (en) | 2022-04-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111679024.0A Pending CN114289629A (en) | 2021-12-31 | 2021-12-31 | Method for forming rim |
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| CN109338234A (en) * | 2018-12-14 | 2019-02-15 | 辽宁衡业高科新材股份有限公司 | A kind of preparation method of 1100MPa rank heat treatment wheel |
| CN110834176A (en) * | 2018-08-17 | 2020-02-25 | 浙江金固股份有限公司 | Rim manufacturing method and wheel manufacturing method |
| CN111673072A (en) * | 2020-06-22 | 2020-09-18 | 北京航空航天大学 | Wheel forming device and method based on center pressurization of multiple lift pipes |
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2021
- 2021-12-31 CN CN202111679024.0A patent/CN114289629A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110050992A (en) * | 2009-11-09 | 2011-05-17 | 주식회사 성우하이텍 | Manufacture method of belt pulley |
| CN203459528U (en) * | 2013-09-02 | 2014-03-05 | 山东华轮实业有限公司 | Opposite opening wheel hub manufacturing die |
| WO2015197469A1 (en) * | 2014-06-25 | 2015-12-30 | Thyssenkrupp Steel Europe Ag | Method and forming tool for heat-forming, and corresponding work piece |
| KR20160113368A (en) * | 2015-03-18 | 2016-09-29 | 주식회사 포스코 | Hydro forming apparatus |
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