CN111546002A - Integrated forming process for producing rear controller shell of lower tube of electric bicycle - Google Patents
Integrated forming process for producing rear controller shell of lower tube of electric bicycle Download PDFInfo
- Publication number
- CN111546002A CN111546002A CN202010391752.0A CN202010391752A CN111546002A CN 111546002 A CN111546002 A CN 111546002A CN 202010391752 A CN202010391752 A CN 202010391752A CN 111546002 A CN111546002 A CN 111546002A
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- China
- Prior art keywords
- pipe
- electric bicycle
- lower tube
- forming process
- controller shell
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M6/00—Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor
- B62M6/40—Rider propelled cycles with auxiliary electric motor
- B62M6/45—Control or actuating devices therefor
Abstract
An integrated forming process for producing a shell of a rear controller of a lower tube of an electric bicycle comprises the steps of extruding; step two, first saw cutting; step three, pipe shrinkage; step four, pumping the tube; step five, tube drawing; step six, flattening; step seven, bending; step eight, prepressing and forming; step nine, water injection molding; step eleven, second saw cutting; and step eleven, grinding. The motor seat and the lower tube are combined into a whole, and the integrated production of the shell of the rear controller of the lower tube of the electric bicycle is realized. The whole production process is green and environment-friendly, the production efficiency is high, and the product has attractive appearance and excellent mechanical performance.
Description
Technical Field
The invention relates to the field of gas aluminum processing, in particular to an integrated forming process for producing a shell of a rear controller of a lower tube of an electric bicycle.
Background
Nowadays, with the continuous development of the industrial level in China and the continuous improvement of the living standard of people, people pay more and more attention to the problem of environmental pollution, so that energy conservation and emission reduction are in the forefront and need to be put to the real place. The green manufacturing action implemented in China puts down energy conservation and emission reduction to the production and manufacturing process of products, so that the increasing environmental protection requirements of people can be realized, more production cost can be saved for enterprises, and higher profits are obtained from the enterprises.
At present, a rear controller shell of a lower tube of an electric bicycle is formed by welding a motor seat shell and the lower tube in a split manner. Wherein, motor seat shell is the forging, forges the advanced machining after the shaping, then splices the welding with the lower tube that has processed, carries out whole welding bead at last and polishes, and this kind of production technology exists very big not enoughly: 1) the whole production period is long, and the aim of 'green manufacturing' is deviated; 2) the welded product has poor size precision, the overall attractiveness is reduced, the strength stability of the welding position is poor, and the use of the product is affected.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide an integrated forming process for producing a shell of a lower tube rear controller of an electric bicycle, which solves the problems in the production of the shell of the lower tube rear controller of the electric bicycle.
The technical scheme is as follows: the invention provides an integrated forming process for producing a shell of a rear controller of a lower tube of an electric bicycle, which comprises the following steps
Step one, extruding: obtaining a pipe with required external dimension by extrusion;
step two, first sawing: sawing the pipe and reserving machining allowance;
step three, pipe shrinking: reducing one end of the pipe to the required size for machining a lower pipe by using a pipe reducing machine;
step four, tube drawing: reducing the thickness of the redundant part;
step five, tube drawing: performing an external cold forging process on the pipe by using a tube knurling machine;
step six, flattening: flattening the cross section of the pipe into a required shape by using a punching machine;
step seven, bending: performing a bending process on the pipe by using a punching machine;
step eight, prepressing and forming: performing shape pre-pressing on the pipe by using an oil pressure press;
step nine water injection molding: forming the pipe material into a shape required by a product by using a water pressure internal expanding machine through water pressure;
step eleven, second sawing: sawing according to the actual required length of the product;
grinding in the eleventh step: and grinding and polishing the surface of the product.
The motor seat and the lower tube are combined into a whole, and the integrated production of the shell of the rear controller of the lower tube of the electric bicycle is realized.
Furthermore, the first step adopts a seam spiral welding seam extrusion large pipe technology, the feeding mode is a precession type, and an S-shaped bridge position extrusion die is used for extrusion. Therefore, the pipe with the spiral weld structure is obtained, the strength of the pipe is improved by about 15 percent compared with that of a common extruded round pipe, the extension of the pipe is more than 10 percent, and the outer diameter of the pipe when the pipe is broken can reach more than 1.2 times of the original outer diameter when a pipe expanding cracking test is carried out. Thereby solving the problems that the processing cost is higher when using the seamless pipe, the joint strength of the welding seam is not enough and the inner expansion is not suitable when using the common seamed pipe.
Furthermore, the deformation of the tube drawing in the fourth step is 15-40%. The tube drawing process can not only reduce the weight of the product and improve the utilization rate of the raw materials, but also increase the compactness of the product and improve the crystal grains of the product, thereby improving the overall strength of the product.
Furthermore, the cross section of the tube in the sixth step is pressed into an oval shape, and the size of the short diameter is less than the width of the bending die by 1-2 MM. And the stress of the whole bending surface is uniform when the subsequent bending work is carried out, so that the product quality is improved.
Further, in the seventh step, the relationship between the radius R of the bending die and the radius R of the product bending die satisfies R =0.94 × R. The product that has guaranteed to bend out has fine size precision.
And furthermore, the width of the product after prepressing in the step eight needs to be 1.5-2 MM smaller than that of the water injection mold.
Further, the water pressure of not less than 60kg/cm in the step nine. The water injection molding process has the advantages of low production cost, one-step molding, high processing speed and great improvement on production efficiency; the formed product has stable rigidity, better surface smoothness, no defects of sand holes, internal injury and the like, higher appearance precision and smooth and elegant appearance.
Further, the step eleven comprises rough grinding and accurate grinding, wherein the precision of a sand belt adopted by the rough grinding is 180#, and the precision of a sand belt adopted by the accurate grinding is 240 #. Roughly grinding and polishing the surface adhesion layer so as to remove impurities on the surface of the product; and then, the surface of the steel plate is finely ground, and the surface roughness of the steel plate is 3.2. The multiple-time grading grinding avoids the secondary damage to the surface of the product caused by large-particle impurities during grinding, thereby improving the overall appearance and attractiveness of the product.
Furthermore, the material of the pipe is 6061 aluminum, and the thickness of the pipe is 2.5-5 mm. The 6061 aluminum material has good mechanical property, easy processing and low cost. When the pipe is processed, the thickness of the extruded pipe is guaranteed to be 2.5-5mm, when the thickness is smaller than 2.5mm, the strength of the processed product is not enough, and after the thickness is larger than 5mm, the inside of the pipe can crack when the pipe is subjected to a pipe shrinking process, so that the strength is influenced.
The technical scheme shows that the invention has the following beneficial effects: 1) the rear controller shell of the lower tube of the electric bicycle adopts a 6061 aluminum alloy seamed spiral welding bead extruded large tube as a raw material, and is integrally formed and processed through the procedures of tube shrinkage, tube drawing, tube arrangement, shape pressing, water injection and the like, so that the rear controller shell of the lower tube of the electric bicycle is more reasonable in product structure and superior in mechanical performance; 2) the whole production process reduces the working procedures of forging, welding, polishing and the like, not only greatly shortens the production period and is suitable for batch production, but also reduces the whole operation cost and the raw material consumption, reduces the pollution to the environment and plays a role in energy conservation and emission reduction; 3) and the whole processing cost and the operation cost are lower, and 3) the shell of the rear controller of the lower tube of the electric bicycle is integrally formed, so that the appearance and the shape are smooth and attractive, the strength is high, and the service life of the product is greatly prolonged.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a rear controller housing of a lower tube of an electric bicycle before modification;
FIG. 3 is a modified lower tube rear controller housing of the electric bicycle;
FIG. 4 is a cross-sectional view A-A of the rear controller housing of the lower tube of the improved electric bicycle.
In the figure: the improved electric bicycle comprises an improved front motor seat 1, an improved front lower pipe 2, a welding bead 3 and an improved electric bicycle lower pipe rear controller shell 4.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Example one
FIG. 1 shows a flow chart of the present invention, comprising
Step one, extruding: obtaining a pipe with required external dimension by extrusion;
step two, first sawing: sawing the pipe and reserving machining allowance;
step three, pipe shrinking: reducing one end of the pipe to the required size for machining a lower pipe by using a pipe reducing machine;
step four, tube drawing: reducing the thickness of the redundant part;
step five, tube drawing: performing an external cold forging process on the pipe by using a tube knurling machine;
step six, flattening: flattening the cross section of the pipe into a required shape by using a punching machine;
step seven, bending: performing a bending process on the pipe by using a punching machine;
step eight, prepressing and forming: performing shape pre-pressing on the pipe by using an oil pressure press;
step nine water injection molding: forming the pipe material into a shape required by a product by using a water pressure internal expanding machine through water pressure;
step eleven, second sawing: sawing according to the actual required length of the product;
grinding in the eleventh step: and grinding and polishing the surface of the product.
And step one, adopting a seam spiral welding seam extrusion type large pipe technology, wherein the feeding mode is a precession type, and an S-shaped bridge position extrusion die is used for extrusion. The strength tensile strength of a general extrusion round pipe is 260MPa, the yield strength is 240 MPa, the lowest tensile strength of the pipe with the spiral weld joint structure obtained after extrusion can reach 300MPa, and the lowest yield strength can reach 270 MPa; the extension of the pipe with the spiral weld structure reaches more than 10 percent, and the outer diameter of the pipe when the pipe is broken can reach more than 1.2 times of the original outer diameter when the pipe is subjected to a pipe expansion cracking test.
And the deformation of the pumping pipe in the fourth step is 15-40%. The content is preferably 25%.
And pressing the cross section of the tube in the sixth step into an oval shape, wherein the size of the short diameter is less than the width of the bending die by 1-2 MM.
In the seventh step, the relation between the radius R of the bending die and the radius R of the product bending die meets R = 0.94R.
And step eight, the width of the product after prepressing is 1.5-2 MM smaller than that of the water injection mold.
Water pressure is not less than 60kg/cm in the step nine.
And the eleventh step comprises coarse grinding and fine grinding, wherein the precision of a sand belt adopted by the coarse grinding is 180#, and the precision of a sand belt adopted by the fine grinding is 240 #.
The material of the pipe is 6061 aluminum, and the thickness of the pipe is 2.5-5 mm.
As shown in fig. 2, which is a front view of a rear controller casing of a lower tube of an electric bicycle before improvement, a front motor seat 1 and a front lower tube 2 are welded after being spliced, and then a welding bead 3 is ground; fig. 3 and 4 show a front view and a cross-sectional view a-a of the improved lower tube rear controller case 4 of the electric bicycle, respectively. As can be seen, the appearance and the shape of the improved product are smoother, and the dimensional accuracy is higher.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.
Claims (9)
1. The utility model provides an integrated into one piece technology is used in production of electric bicycle low tube rearmounted controller shell which characterized in that: comprises that
Step one, extruding: obtaining a pipe with required external dimension by extrusion;
step two, first sawing: sawing the pipe and reserving machining allowance;
step three, pipe shrinking: reducing one end of the pipe to the required size for machining a lower pipe by using a pipe reducing machine;
step four, tube drawing: reducing the thickness of the redundant part;
step five, tube drawing: performing an external cold forging process on the pipe by using a tube knurling machine;
step six, flattening: flattening the cross section of the pipe into a required shape by using a punching machine;
step seven, bending: performing a bending process on the pipe by using a punching machine;
step eight, prepressing and forming: performing shape pre-pressing on the pipe by using an oil pressure press;
step nine water injection molding: forming the pipe material into a shape required by a product by using a water pressure internal expanding machine through water pressure;
step eleven, second sawing: sawing according to the actual required length of the product;
grinding in the eleventh step: and grinding and polishing the surface of the product.
2. The integrated forming process for producing the lower tube rear controller shell of the electric bicycle as claimed in claim 1, wherein: and step one, adopting a seam spiral welding seam extrusion type large pipe technology, wherein the feeding mode is a precession type, and an S-shaped bridge position extrusion die is used for extrusion.
3. The integrated forming process for producing the lower tube rear controller shell of the electric bicycle as claimed in claim 1, wherein: and the deformation of the pumping pipe in the fourth step is 15-40%.
4. The integrated forming process for producing the lower tube rear controller shell of the electric bicycle as claimed in claim 1, wherein: and pressing the cross section of the tube in the sixth step into an oval shape, wherein the size of the short diameter is less than the width of the bending die by 1-2 MM.
5. The integrated forming process for producing the lower tube rear controller shell of the electric bicycle as claimed in claim 1, wherein: in the seventh step, the relation between the radius R of the bending die and the radius R of the product bending die meets R = 0.94R.
6. The integrated forming process for producing the lower tube rear controller shell of the electric bicycle as claimed in claim 1, wherein: and step eight, the width of the product after prepressing is 1.5-2 MM smaller than that of the water injection mold.
7. The integrated forming process for producing the lower tube rear controller shell of the electric bicycle as claimed in claim 1, wherein: water pressure is not less than 60kg/cm in the step nine.
8. The integrated forming process for producing the lower tube rear controller shell of the electric bicycle as claimed in claim 1, wherein: and the eleventh step comprises coarse grinding and fine grinding, wherein the precision of a sand belt adopted by the coarse grinding is 180#, and the precision of a sand belt adopted by the fine grinding is 240 #.
9. The integrated forming process for producing the lower tube rear controller shell of the electric bicycle as claimed in any one of claims 1 to 8, wherein: the material of the pipe is 6061 aluminum, and the thickness of the pipe is 2.5-5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010391752.0A CN111546002A (en) | 2020-05-11 | 2020-05-11 | Integrated forming process for producing rear controller shell of lower tube of electric bicycle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010391752.0A CN111546002A (en) | 2020-05-11 | 2020-05-11 | Integrated forming process for producing rear controller shell of lower tube of electric bicycle |
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| CN111546002A true CN111546002A (en) | 2020-08-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010391752.0A Pending CN111546002A (en) | 2020-05-11 | 2020-05-11 | Integrated forming process for producing rear controller shell of lower tube of electric bicycle |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2068049U (en) * | 1990-05-23 | 1990-12-26 | 段有福 | Spiral nobbing type circle pipe machine |
| US4987764A (en) * | 1989-12-13 | 1991-01-29 | Chen Chin Pei | Method for manufacturing a seat post of a bicycle |
| CN2079559U (en) * | 1990-06-29 | 1991-06-26 | 刘兴贵 | Vertical screw extruding machine for tube |
| CN2117955U (en) * | 1992-04-04 | 1992-10-07 | 中南工业大学 | Rotating continuous extruding machine |
| CN101480978A (en) * | 2009-01-21 | 2009-07-15 | 深圳信隆实业股份有限公司 | Integral bike metal seat tube and molding method thereof |
| CN102039514A (en) * | 2009-10-15 | 2011-05-04 | 达建工业股份有限公司 | Integrated bicycle front fork tube and manufacturing procedure thereof |
| CN103934641A (en) * | 2014-04-28 | 2014-07-23 | 明达铝业科技(太仓)有限公司 | Method for machining tube with lower tube and upper fork integrally formed of bicycle |
| CN108016554A (en) * | 2018-02-05 | 2018-05-11 | 天成车料（深圳）有限公司 | Electric bicycle integral type down tube motor base and shaped by fluid pressure method |
| CN108128396A (en) * | 2018-02-05 | 2018-06-08 | 天成车料（深圳）有限公司 | Electric bicycle integral type middle pipe and hydro-forming method |
| CN109093330A (en) * | 2018-08-27 | 2018-12-28 | 广东思豪内高压科技有限公司 | A kind of water swelling moulding process of silencer for automobile |
-
2020
- 2020-05-11 CN CN202010391752.0A patent/CN111546002A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4987764A (en) * | 1989-12-13 | 1991-01-29 | Chen Chin Pei | Method for manufacturing a seat post of a bicycle |
| CN2068049U (en) * | 1990-05-23 | 1990-12-26 | 段有福 | Spiral nobbing type circle pipe machine |
| CN2079559U (en) * | 1990-06-29 | 1991-06-26 | 刘兴贵 | Vertical screw extruding machine for tube |
| CN2117955U (en) * | 1992-04-04 | 1992-10-07 | 中南工业大学 | Rotating continuous extruding machine |
| CN101480978A (en) * | 2009-01-21 | 2009-07-15 | 深圳信隆实业股份有限公司 | Integral bike metal seat tube and molding method thereof |
| CN102039514A (en) * | 2009-10-15 | 2011-05-04 | 达建工业股份有限公司 | Integrated bicycle front fork tube and manufacturing procedure thereof |
| CN103934641A (en) * | 2014-04-28 | 2014-07-23 | 明达铝业科技(太仓)有限公司 | Method for machining tube with lower tube and upper fork integrally formed of bicycle |
| CN108016554A (en) * | 2018-02-05 | 2018-05-11 | 天成车料（深圳）有限公司 | Electric bicycle integral type down tube motor base and shaped by fluid pressure method |
| CN108128396A (en) * | 2018-02-05 | 2018-06-08 | 天成车料（深圳）有限公司 | Electric bicycle integral type middle pipe and hydro-forming method |
| CN109093330A (en) * | 2018-08-27 | 2018-12-28 | 广东思豪内高压科技有限公司 | A kind of water swelling moulding process of silencer for automobile |
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Application publication date: 20200818 |
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| RJ01 | Rejection of invention patent application after publication |