CN114603308A - Forming process of corrosion-resistant shielding case - Google Patents
Forming process of corrosion-resistant shielding case Download PDFInfo
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- CN114603308A CN114603308A CN202011396452.8A CN202011396452A CN114603308A CN 114603308 A CN114603308 A CN 114603308A CN 202011396452 A CN202011396452 A CN 202011396452A CN 114603308 A CN114603308 A CN 114603308A
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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
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Abstract
The invention discloses a forming process of a corrosion-resistant shielding case, which adopts a spinning machine controlled by a singlechip system to integrally process a plate into the shielding case and comprises the following processing steps: blank preparation, pooh spinning, turning hole, tensile spinning, turn up rims for the first time, burring, turn up rims, polishing of second time and wash. The shielding cover produced by the process has light weight, thin thickness and high material utilization rate; welding processing is not needed, welding equipment is saved, all processing can be completed on one spinning machine, the operation is simpler and more convenient, and the processing cost is reduced; the edge of the workpiece is covered inside the workpiece by adopting a unique inward flanging bending spinning process, so that the workpiece is prevented from being in direct contact with the external environment, the corrosion resistance is improved, and the service life is prolonged.
Description
Technical Field
The invention relates to the technical field of shielding case processing, in particular to a forming process of a corrosion-resistant shielding case.
Background
Shields are important components for protecting certain electrical devices in an electrical grid. These electric power components are subjected to discharge during operation, and therefore need to be shielded and protected. Due to different structures of the power equipment, the shielding case on the outer part of the power equipment also has corresponding different shapes. Therefore, it is desirable for the shield to be able to meet the performance requirements below, and to match the shape of the electrical equipment it is protecting. The shielding cover is generally made of aluminum or aluminum alloy, the withstand voltage requirement of power frequency is high, the manufacturing process is strict, the quality requirement on the inner surface and the outer surface of the shielding cover is high to meet the high-voltage performance of the shielding cover, burrs are not allowed to appear, and sufficient roughness is guaranteed.
The spinning technology is a plastic forming method for processing a metal revolving body and has the characteristic of local continuous plastic deformation. The method is that a flat plate blank or a preformed blank is fixed on a rotating core mould, pressure is applied to the blank by a rotary wheel, the rotary wheel simultaneously carries out axial feeding, and various thin-wall hollow revolving body products are obtained after one or more times of processing. Conventional spinning refers to a forming process in which the shape of a blank is changed, the diameter is increased or decreased, and the thickness is unchanged or slightly changed during the spinning process. The drawing spinning is a common spinning process, which is a forming process that a plate is spun into a cylindrical piece or a conical piece, and radial drawing is taken as main body deformation to reduce the diameter of a blank.
The spinning forming of the high-voltage switch shielding cover by using a numerical control spinning machine (electromechanical technology, 2011, 34(5)) provides a spinning process of the shielding cover, but the shape of the spun shielding cover is simpler, and an inward flanging bending process which is difficult to realize in spinning is not needed. When the blank is installed and positioned, a positioning hole needs to be manufactured in advance. The spinning machine used by the method is an old profiling spinning machine, a profiling template needs to be additionally processed, and the processing efficiency is low.
The spinning shielding cover provided by the research on the common spinning forming process of the high-voltage switch shielding cover (forging technology, 2005, 30(1)) has a shape which is greatly different from that of the shielding cover in the invention, the used curling and flanging process are the same and are easy to realize in the spinning processing, and a special curling spinning wheel is arranged for the curling. The spinning machine used by the method is an old profiling spinning machine, a profiling template needs to be additionally processed, and the processing efficiency is low.
Patent application No. 200410041741.0, "spinning process for high voltage equipment shielding products", which is not clear, uses a thinning spinning process and a welding process, unlike the conventional spinning process of the present invention.
For this type of shield according to the invention, the shield is circular and has a C-shaped cross-section, the outer rim of which has an inner edge of greater curvature. The conventional manufacturing method is a two-body type manufacturing method, wherein the part is divided into an upper part and a lower part, which are respectively manufactured by a stamping process or a spinning process and then welded into a whole. The method has the advantages of low production efficiency, poorer performance of the welding position, more wasted materials, high production cost, long preparation period and difficult forming of complex parts.
Therefore, those skilled in the art are dedicated to develop a new spin forming process for producing the shielding case, so as to overcome the defects of the two-body processing process, realize the inward flanging processing of the shielding case with low cost and high efficiency, improve the utilization rate of materials, and improve the quality of products.
Disclosure of Invention
In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a new process for integrally spin-forming a shielding can.
In order to achieve the purpose, the invention provides a forming process of a corrosion-resistant shielding case, which adopts a spinning machine controlled by a singlechip system to integrally process a plate material into the shielding case and comprises the following processing steps: blank preparation, pooh spinning, turning hole, tensile spinning, turn up rims for the first time, burring, turn up rims, polishing of second time and wash.
Preferably, the plate stock is an aluminum alloy flat plate.
Blank manufacturing refers to cutting a plate into round blanks.
The pooh spinning method comprises the following specific steps: installing a first auxiliary die on the spinning machine, fixing the blank on the spinning machine from the tail top, coating a lubricant on the blank, driving the blank to rotate by a main shaft at the moment, feeding a spinning wheel according to a set program, and performing pooh spinning; the rotating speed of the main shaft is 600-1000 r/min, and the feeding rate of the spinning wheel is 4-10 mm/r.
The inner hole turning method comprises the following specific steps: after the pooh spinning is finished, the workpiece is not taken down, the spinning wheel is changed into a turning tool by using tool changing operation, the workpiece rotates along with the main shaft, the turning tool cuts an inner hole of the workpiece, and the workpiece is in a horn shape; the rotating speed of the main shaft is 300-500 r/min, and the turning tool is made of high-speed steel; and taking down the workpiece, and unloading the first secondary die.
The drawing spinning comprises the following specific steps: installing a second auxiliary die on the spinning machine, turning the workpiece with the cut inner hole, then loading the workpiece into the second auxiliary die, coating a lubricant on the workpiece, rotating the workpiece under the driving of the main shaft, axially feeding the spinning wheel, stretching and spinning, and axially extending the outer edge of the workpiece; the rotating speed of the main shaft is 600-1000 r/min, and the feeding rate of the spinning wheel is 4-10 mm/r; and taking down the workpiece after the stretching and spinning are finished, and unloading the second pair of dies.
The first flanging comprises the following specific steps: installing a third auxiliary die on the spinning machine, adjusting the direction of the stretched and spun workpiece, then installing the stretched and spun workpiece into the third auxiliary die, coating a lubricant on the workpiece, and driving the workpiece to rotate under the driving of the main shaft; the rotating speed of the main shaft is 400-600 r/min, the rotary wheel performs axial and radial feeding, flanging operation is performed, the outer edge of the workpiece is flanged inwards, and the feeding rate of the rotary wheel is 3-8 mm/r.
The deburring method comprises the following specific steps: after flanging is finished, the workpiece is not taken down, the rotating wheel is changed into a turning tool by using tool changing operation, the workpiece rotates along with the main shaft, and the turning tool cuts a corrugated part on the edge of the workpiece after flanging; the rotating speed of the main shaft is 300-500 r/min, and the material of the turning tool is high-speed steel.
The second flanging comprises the following specific steps: the workpiece is not taken down, a fourth set of die is arranged on the spinning machine, the rotating speed of the main shaft and the feeding rate of the spinning wheel are controlled after the spinning wheel is replaced, and secondary flanging is carried out, so that the requirements on the shape and the size of the product are met; the rotation speed of the main shaft is 400-600 r/min, and the feed rate of the spinning wheel is 3-8 mm/r.
The polishing and cleaning method comprises the following specific steps: and (4) grinding and polishing the workpiece which is spun and processed, and cleaning the workpiece by using a cleaning solution to obtain a finished product of the shielding case.
In a preferred embodiment of the present invention, an integral spin forming process for a shielding can is provided, which eliminates the step of welding and directly produces an integral product. Four sets of special spinning processing dies are adopted, and the processing routes of each pass are different after feeding of 200-250 passes, so that the welding-seam-free integrated shielding cover can be manufactured.
The spinning forming process of the shielding case provided by the invention has the following beneficial effects:
1. by adopting the spinning integrated forming process, the product has no welding line, good quality of the inner and outer surfaces, beautiful appearance, corrosion resistance and service life which can be improved by 300 to 500 percent.
2. The shielding cover obtained by the spinning process has the advantages of light weight, thin thickness, high material utilization rate, less waste and capability of greatly reducing the cost.
3. The welding processing is not needed, the welding equipment is saved, all processing can be completed on one spinning machine, the operation is simpler and more convenient, and the processing cost is reduced.
4. The edge of the workpiece is covered in the workpiece by adopting a unique inward flanging bending spinning process, so that the workpiece is prevented from being in direct contact with the external environment, the corrosion resistance is improved, and the service life is prolonged.
Detailed Description
For the shielding case with the shape, a two-body forming method is generally adopted at present, an upper part workpiece and a lower part workpiece are manufactured by a stamping process or a spinning process, and then the two parts are welded. The main defects are that the corrosion resistance of the welding seam is poor, the welding seam is easy to be broken down by electric discharge in a high-voltage environment and fails, and the failure of the welding seam becomes the most main reason of the failure of the products. The two-body forming process has the defects of more matched moulds, long processing period, difficult forming of parts with complex shapes, high cost and the like. Due to the welding requirement, the product of the method has thicker wall thickness and high material cost.
The invention provides a forming process of a corrosion-resistant shielding case, which is characterized in that a single chip microcomputer system (CNC) spinning machine is adopted for spinning at room temperature, and the thickness of a workpiece is kept unchanged in the whole spinning process.
The processing steps are as follows:
1. blank preparation: an ultra-flat aluminum material with the thickness of 3 mm is selected and cut into a circular spinning blank with the diameter of 820 mm.
2. Spinning at a pooh: a first secondary die is arranged on the numerical control spinning machine, an inner hole is formed in the middle of the die, and the die can be inflated during discharging to enable a workpiece to be easily taken down. And the tail top is axially fed forwards to fix the spinning blank on a first secondary die, the blank is positioned by a special positioning device, and lubricant is coated on the blank and is selected from No. 46 hydraulic oil. At the moment, the blank is driven by the main shaft to rotate, the spinning wheel feeds according to a set program, the first step of spinning is carried out, and 3-5 passes are carried out. Wherein the rotation speed of the main shaft is 600-1000 r/min, and the feed rate of the spinning wheel is 4-10 mm/r.
3. Turning an inner hole: and after the first step of spinning is finished, the workpiece is not taken down, the spinning wheel is changed into a turning tool by using tool changing operation, the workpiece rotates along with the main shaft, and the turning tool cuts an inner hole of the workpiece. And stopping rotating the workpiece, feeding the tail top backwards, and taking down the turned bottom plate. At the moment, the workpiece is in a horn shape, then the workpiece is taken down, and the first secondary die is unloaded. Wherein the rotating speed of the main shaft is 300-500 r/min, and the cutter is made of high-speed steel.
4. Stretching and spinning: installing a second auxiliary die on the numerical control spinning machine, adjusting the direction of a workpiece with an inner hole, then installing the workpiece into the second auxiliary die, coating a lubricant on the workpiece, rotating the workpiece under the driving of a main shaft, axially feeding a spinning wheel, and performing stretching spinning for 80-100 passes, wherein 50-60 passes perform spinning of an arc part, 20-30 passes perform spinning of a straight line part, a feed point is arranged in the middle of the workpiece, the rest 10-20 passes perform deburring of the overall shape, and each pass of the spinning wheel is still in contact with the workpiece when returning, so that certain deburring is performed on the surface of the workpiece, and the spinning efficiency is improved. Thereby extending the outer edge of the workpiece in the axial direction to obtain the workpiece. Wherein the rotation speed of the main shaft is 600-1000 r/min, and the feed rate of the spinning wheel is 4-10 mm/r. And then removing the workpiece and discharging the second secondary die.
5. Flanging: installing a third auxiliary die on a numerical control spinning machine, turning the stretched and spun workpiece, then installing the workpiece into the third auxiliary die, coating a lubricant on the workpiece, rotating the workpiece under the driving of a main shaft, wherein the rotating speed of the main shaft is 400-600 r/min, feeding 40-60 passes in the axial direction and the radial direction by a spinning wheel, gradually reducing the feeding amount of the passes, not contacting the workpiece when the spinning wheel returns, performing flanging operation by adopting a stepping spinning method, respectively performing deburring on the surface and the shape of the workpiece by 3-5 passes in the middle and at the end of the operation, and turning the outer edge of the workpiece inwards, wherein the feeding rate of the spinning wheel is 3-8 mm/r.
6. Deburring turn-ups rear edge part: and after flanging is finished, the workpiece is not taken down, the rotating wheel is changed into the turning tool by using tool changing operation, and after the workpiece rotates along with the main shaft, the turning tool cuts the corrugated part on the edge of the workpiece after flanging down so as to meet the size requirement. Wherein the rotating speed of the main shaft is 300-500 r/min, and the cutter is made of high-speed steel.
7. And (5) flanging for the second time: and (3) without taking down the workpiece, mounting a fourth set of die on the spinning machine, switching to a special spinning wheel, controlling the feeding of the spinning wheel, performing secondary flanging, feeding 60-80 passes, wherein the initial pass feeding amount is smaller, then the feeding amount is increased, and the feeding amount is reduced during the final pass to remove the burr workpiece, so that the requirements on the shape and the size of the product are met. Wherein the rotation speed of the main shaft is 400-600 r/min, and the feed rate of the spinning wheel is 3-8 mm/r.
8. Polishing and cleaning: and (3) grinding and polishing the spun parts by using abrasive paper, unloading the workpieces, and cleaning the workpieces in a water pool by using cleaning liquid to obtain a finished product of the shielding cover.
The failure of the welding seam of the shielding case obtained by the traditional two-body processing technology is the most main reason of the failure of the product. The integrated forming process firstly solves the problem of poor corrosion resistance at the welding seam, and the product produced by the process has no welding seam, good quality of the inner surface and the outer surface, greatly improved corrosion resistance and greatly prolonged service life. The manufacturing cost is low, the period is short, the mechanical property and the high-pressure property are better, the appearance is attractive, and the utilization rate of the material is improved. The product formed by the process reduces welding processing, and can obtain a product with thinner thickness by using thinner plates by using spinning processing, so that the cost is saved. By adopting a unique inward flanging bending spinning process, the edge of the workpiece is spun step by step and then is covered in the workpiece, so that the direct contact with the external environment is avoided, the corrosion resistance is further improved, and the service life is further prolonged.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the above teachings. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A forming process of a corrosion-resistant shielding case is characterized in that a spinning machine controlled by a single chip microcomputer system is adopted to integrally process a plate into the shielding case, and the forming process comprises the following processing steps: blank manufacturing, pooh spinning, inner hole turning, stretching spinning, primary flanging, deburring, secondary flanging, polishing and cleaning;
wherein, the first flanging is to inwards flange the outer edge of the workpiece.
2. The process of claim 1, wherein said sheet material is a flat sheet of aluminum alloy.
3. The process of claim 1, wherein said forming of said blank is cutting a sheet into a circular blank.
4. The forming process of the corrosion-resistant shielding case according to claim 1, wherein the pooh spinning comprises the following specific steps: installing a first auxiliary die on the spinning machine, fixing the blank on the spinning machine from the tail top, coating a lubricant on the blank, driving the blank to rotate by a main shaft at the moment, feeding a spinning wheel according to a set program, and performing pooh spinning; the rotating speed of the main shaft is 600-1000 r/min, and the feeding rate of the spinning wheel is 4-10 mm/r.
5. The process of claim 1, wherein said turning of the inner bore comprises the specific steps of: after the pooh spinning is finished, the workpiece is not taken down, the spinning wheel is changed into a turning tool by using tool changing operation, the workpiece rotates along with the main shaft, the turning tool cuts an inner hole of the workpiece, and the workpiece is in a horn shape; the rotating speed of the main shaft is 300-500 r/min, and the turning tool is made of high-speed steel; and taking down the workpiece, and unloading the first secondary die.
6. The process of claim 1, wherein said stretch-spinning comprises the specific steps of: installing a second auxiliary die on the spinning machine, turning the workpiece with the cut inner hole, then loading the workpiece into the second auxiliary die, coating a lubricant on the workpiece, rotating the workpiece under the driving of the main shaft, axially feeding the spinning wheel, stretching and spinning, and axially extending the outer edge of the workpiece; the rotating speed of the main shaft is 600-1000 r/min, and the feeding rate of the spinning wheel is 4-10 mm/r; and taking down the workpiece after the stretching and spinning are finished, and unloading the second pair of dies.
7. The process of claim 1, wherein said first flanging comprises the specific steps of: installing a third auxiliary die on the spinning machine, adjusting the direction of the stretched and spun workpiece, then installing the stretched and spun workpiece into the third auxiliary die, coating a lubricant on the workpiece, and rotating the workpiece under the driving of the main shaft; the rotating speed of the main shaft is 400-600 r/min, the rotary wheel performs axial and radial feeding, flanging operation is performed, the outer edge of the workpiece is flanged inwards, and the feeding rate of the rotary wheel is 3-8 mm/r.
8. The process of claim 1, wherein said deburring comprises the specific steps of: after flanging is finished, the workpiece is not taken down, the rotating wheel is changed into a turning tool by using tool changing operation, the workpiece rotates along with the main shaft, and the turning tool cuts a corrugated part on the edge of the workpiece after flanging; the rotating speed of the main shaft is 300-500 r/min, and the material of the turning tool is high-speed steel.
9. The process of claim 1, wherein said second flanging comprises the specific steps of: the workpiece is not taken down, a fourth set of die is arranged on the spinning machine, the rotating speed of the main shaft and the feeding rate of the spinning wheel are controlled after the spinning wheel is replaced, and secondary flanging is carried out, so that the requirements on the shape and the size of the product are met; the rotation speed of the main shaft is 400-600 r/min, and the feed rate of the spinning wheel is 3-8 mm/r.
10. The process of claim 1, wherein said polishing and cleaning comprises the steps of: and (4) grinding and polishing the workpiece which is spun and processed, and cleaning the workpiece by using a cleaning solution to obtain a finished product of the shielding case.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011396452.8A CN114603308A (en) | 2020-12-03 | 2020-12-03 | Forming process of corrosion-resistant shielding case |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011396452.8A CN114603308A (en) | 2020-12-03 | 2020-12-03 | Forming process of corrosion-resistant shielding case |
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| Publication Number | Publication Date |
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| CN114603308A true CN114603308A (en) | 2022-06-10 |
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| CN202011396452.8A Withdrawn CN114603308A (en) | 2020-12-03 | 2020-12-03 | Forming process of corrosion-resistant shielding case |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115351507A (en) * | 2022-08-10 | 2022-11-18 | 株洲市四兴机械有限公司 | Processing technology for air conditioner compressor shell of new energy passenger car |
-
2020
- 2020-12-03 CN CN202011396452.8A patent/CN114603308A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115351507A (en) * | 2022-08-10 | 2022-11-18 | 株洲市四兴机械有限公司 | Processing technology for air conditioner compressor shell of new energy passenger car |
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Application publication date: 20220610 |