CN112247052A - Manufacturing process of high-safety nitrogen spring cylinder - Google Patents
Manufacturing process of high-safety nitrogen spring cylinder Download PDFInfo
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- CN112247052A CN112247052A CN202011074859.9A CN202011074859A CN112247052A CN 112247052 A CN112247052 A CN 112247052A CN 202011074859 A CN202011074859 A CN 202011074859A CN 112247052 A CN112247052 A CN 112247052A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/26—Making machine elements housings or supporting parts, e.g. axle housings, engine mountings
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Abstract
The invention discloses a manufacturing process of a high-safety nitrogen spring cylinder, which comprises a bar sawing process, a bar heating process, a bar hot extrusion forming process, a blank hot-drawing forming process, a cylinder blank modulation processing process, a cylinder blank surface processing process, a cylinder blank cold-drawing forming process and a cylinder blank machining process. The remarkable effects are as follows: the preheated bar stock is subjected to extrusion forming, hot drawing and stretching, modulation treatment, surface treatment and cold drawing and stretching and then is machined and formed, so that the mechanical property, the physical property, the forging effect and the yield of finished products of the nitrogen spring cylinder body are greatly improved, the structure is stronger, and the tensile strength and the extensibility of cylinder body products are enhanced.
Description
Technical Field
The invention relates to the technical field of nitrogen spring production, in particular to a manufacturing process of a high-safety nitrogen spring cylinder body.
Background
In the mold industry, elastomeric elements have been used in large quantities; over the years, the mold technology and the mold manufacturing level have been greatly developed and improved, the demand of industrial products for molds is increasing, and the molds are rapidly developed towards the directions of precision, complexity, high efficiency and long service life. The nitrogen spring can provide larger return force, and has the advantages of saving the die space, simplifying the die design and manufacture, reducing the die cost, facilitating the die adjustment and the like; it can be used as a separate part installed in the mould or designed into a nitrogen spring system as a part of the mould to take part in the work. Therefore, the nitrogen spring is applied to the fields of automobile molds, household appliance molds, electronic molds and the like.
In the prior art, the production process of the nitrogen spring cylinder body is seamless steel tube → welding → excircle processing → inner hole processing → blackening, and the nitrogen spring produced by the process has the problems that physical property fatigue can occur to the material of the nitrogen cylinder component under the long-time high-frequency use, and the risk of damage is caused, and meanwhile, certain potential safety hazard exists under the action of high-pressure gas existing in the cylinder body. In order to solve the potential safety hazard, the manufacturing process of the nitrogen spring cylinder body needs to be improved in a targeted manner.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a manufacturing process of a high-safety nitrogen spring cylinder body, which can enable the physical and mechanical properties of the cylinder body to be more excellent and the structure to be stronger, enhances the tensile strength, has better extensibility, increases the overall stability of the cylinder body and improves the safety performance of a nitrogen spring.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the manufacturing process of the high-safety nitrogen spring cylinder body is characterized by comprising the following steps of:
step 1: a bar sawing step, namely selecting a cylinder body substrate according to the performance requirement of the nitrogen gas spring, and processing a bar meeting the requirement by adopting a numerical control sawing machine;
step 2: a bar heating procedure, namely heating the bar by using a heating furnace to enable the bar to be completely austenitized, and controlling the temperature to be 1150-1200 ℃ in the heating process;
and step 3: a bar hot extrusion molding process, wherein the heated bar is subjected to compression molding by using corresponding extrusion dies according to products of different specifications, the temperature of the bar in the compression molding process is not lower than 1150 ℃, and the reduction of area is not more than 50%;
and 4, step 4: a blank hot-drawing forming procedure, wherein the blank after extrusion prefabrication is subjected to hot-drawing stretching forming by adopting corresponding hot-drawing dies according to different product specifications, and the reduction of area per pass is controlled to be below 20% during hot-drawing forming;
and 5: a cylinder body blank modulation treatment procedure, wherein the blank after hot drawing forming is subjected to heat treatment so as to achieve the comprehensive mechanical property index required by the nitrogen spring;
step 6: a cylinder block blank surface treatment step of performing surface treatment on the cylinder block blank after the modulation treatment;
and 7: a cylinder body blank cold-drawing forming procedure, wherein corresponding cold-drawing dies are adopted according to different product specifications, the cylinder body blank subjected to surface treatment is subjected to cold-drawing stretching forming at normal temperature, and the reduction of area per pass is controlled to be below 20%;
and 8: and a cylinder body blank machine processing procedure, wherein machining equipment is adopted to process the cylinder body blank to meet the requirements on size and performance.
In step 1, the cylinder body base material is an alloy structural steel satisfying a tensile strength of not less than 810MPa, a yield strength of not less than 785MPa, and an impact power of not less than 47 AKV.
Further, the weight of the bar stock after sawing in the step 1 is not less than 120% of the weight of the finished part, and loss is reserved.
Further, the heating furnace in the step 2 is a medium-frequency induction type continuous heating furnace.
Further, the step 3 of the hot extrusion forming process of the bar stock comprises the following specific steps:
step 3.1: a preparation process, namely selecting a first press with the pressure not less than 500 tons, and installing an extrusion die corresponding to the product specification on the first press;
step 3.2: in the rapid approaching process, an upper die punch of a first press is controlled to rapidly approach a bar to be pressed and formed;
step 3.3: the method comprises the following steps of (1) a pressing process, wherein an upper die punch of a first press is controlled to slowly approach a bar to be pressed and formed, the bar is pressed, and the speed of the upper die punch is controlled to be 50-80 mm/s in the pressing process;
step 3.4: a quick return process, namely controlling an upper die punch of the first press to quickly return to an initial position;
step 3.5: and in the blanking process, the blank workpiece formed by pressing is ejected to a preset position and transferred to the next procedure through a manipulator.
Further, the step 4 of the hot-drawing forming process of the blank comprises the following specific steps:
step 4.1: the preparation process comprises the steps of selecting a second press with the pressure not less than 500 tons, installing a stretching die corresponding to the product specification on the second press, and controlling the temperature of a blank entering a bar hot drawing forming procedure to be not lower than 900 ℃;
step 4.2: in the quick descending process, an upper die punch of a second press is quickly close to a blank to be subjected to hot drawing and stretching forming;
step 4.3: in the stretching process, an upper die punch of a second press is controlled to slowly approach a blank to be subjected to hot drawing and stretching, the blank is subjected to hot drawing and stretching, and the speed of the upper die punch is controlled to be 50-80 mm/s in the hot drawing and stretching process;
step 4.4: a return process, namely controlling an upper die punch of the second press to return to an initial position quickly;
step 4.5: and in the discharging process, the formed workpiece is ejected to a preset position and transferred to the next procedure through a manipulator.
Further, the cylinder body blank surface treatment process in the step 6 comprises a sand blasting process and a phosphorization saponification process, wherein the sand blasting process is used for carrying out sand blasting treatment on the inner wall and the outer wall of the prepared blank to clean the surface of the blank; and the phosphorization and saponification process is used for phosphorization and saponification of the blank subjected to sand blasting.
Further, the cylinder block blank cold-drawing forming process in the step 7 comprises the following specific steps:
step 7.1: a preparation process, namely selecting a third press with the pressure not less than 800 tons, and installing a drawing die corresponding to the product specification on the third press;
step 7.2: in the quick descending process, an upper die punch of a third press is quickly close to a cylinder body blank to be subjected to cold drawing and stretching forming;
step 7.3: in the drawing process, an upper die punch of a third press is controlled to slowly approach a cylinder blank to be drawn and formed, the cylinder blank is subjected to cold drawing and drawing, and the speed of the upper die punch is controlled to be 10-25 mm/s in the cold drawing and drawing process;
step 7.4: a return process, namely controlling an upper die punch of a third press to return to an initial position quickly;
step 7.5: and in the discharging process, the formed workpiece is ejected to a preset position and taken out through a manipulator.
Further, the cylinder body blank machine processing procedures in the step 8 comprise a rough turning process of an outer circle and an inner hole, a finish turning process of an outer circle in place, a finish turning process of an inner hole in place and reserving a honing allowance process, an inner hole honing process, a cylinder body bottom thread mounting hole processing process and an air inlet and outlet hole processing process.
Further, step 8, after the cylinder block blank is machined, blackening treatment and QPQ salt bath composite treatment are carried out on the surface of the workpiece.
The invention has the following remarkable effects:
1. the process has the advantages that the preheated bar stock is subjected to extrusion forming, hot drawing and stretching, modulation treatment, surface treatment and cold drawing and then is machined and formed, so that the mechanical property, the physical property, the forging effect and the yield of finished products of the nitrogen spring cylinder body are greatly improved, the structure is stronger, and the tensile strength and the extensibility of cylinder body products are enhanced;
2. the rough blank forming of the nitrogen spring cylinder body with a complex structure is realized through the working procedures of hot extrusion, hot drawing and stretching, cold drawing and stretching and the like, so that the overall stability and the safety of the cylinder body in the using process are greatly improved;
3. the process steps of the existing nitrogen spring cylinder body produced by alloy steel are simplified, the cost, time and manpower are greatly saved, and the safety and the working efficiency in production and manufacturing are improved.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
The following provides a more detailed description of the embodiments and the operation of the present invention with reference to the accompanying drawings.
As shown in fig. 1, a manufacturing process of a high-safety nitrogen spring cylinder comprises the following steps:
step 1: bar sawing process
According to the performance requirement of a nitrogen spring, selecting alloy structural steel (such as S45C, Q345 and the like) meeting GB/T3077-2015 standards, wherein the tensile strength is greater than or equal to 810MPa, the yield strength is greater than or equal to 785MPa and the impact power is greater than or equal to 47AKV as a cylinder body substrate, simultaneously putting corresponding round bars according to different product sizes, processing the bars meeting the requirement by adopting a numerical control sawing machine, blanking according to 120% of the weight of a final finished part, wherein the weight tolerance is plus or minus 0.5Kg, and the loss such as heating burning loss, flat bottom, cutting of opening part flash and the like is reserved;
step 2: bar heating process
A medium-frequency induction type continuous heating furnace is adopted to heat the bar stock, the process aims at heating the bar stock to a proper temperature to enable the bar stock to be completely austenitized, so that the bar stock has good plasticity, and the temperature is controlled to 1150-1200 ℃;
and step 3: hot extrusion shaping process for bar stock
The method comprises the following steps of (1) using corresponding extrusion dies according to products of different specifications, performing compression molding on a heated bar by using an extrusion hydraulic press to realize approximate molding of a cylinder body rough blank, wherein the temperature of the bar in the compression molding process is not lower than 1150 ℃, and the reduction of area is not more than 50%;
the method comprises the following specific steps:
step 3.1: a preparation process, namely selecting a first press (extrusion hydraulic press) with the pressure not less than 500 tons, and installing an extrusion die corresponding to the product specification on the first press;
step 3.2: in the rapid approaching process, an upper die punch of a first press is controlled to rapidly approach a bar to be pressed and formed, a workpiece is in a high-temperature state, and the next process is required to be carried out before the temperature of the workpiece is reduced to 1150 ℃;
step 3.3: the method comprises the following steps of (1) a pressing process, wherein an upper die punch of a first press is controlled to slowly approach a bar to be pressed and formed, the bar is pressed, and the speed of the upper die punch is controlled to be 50-80 mm/s in the pressing process so as to ensure that a workpiece has enough deformation time;
step 3.4: in the quick return process, the upper die punch of the first press is controlled to quickly return to the initial position, so that the time of one working cycle can be effectively shortened, and the working efficiency is improved;
step 3.5: and in the blanking process, a special mechanism ejects the blank workpiece subjected to compression molding to a preset position, and the workpiece is quickly taken by a manipulator and transferred to the next procedure.
The pressure of the first press is not less than 500 tons, the output pressure is determined by the size of the workpiece, and the deformation process parameters of different workpieces are different.
And 4, step 4: hot drawing and forming process of blank
Adopting corresponding hot drawing dies according to different product specifications, and carrying out hot drawing and stretching forming on the blank subjected to extrusion prefabrication by adopting a special drawing hydraulic machine to realize thinning and drawing of the cylinder wall of the cylinder body, wherein the reduction of area per pass is controlled to be below 20% during hot drawing forming; the method comprises the following specific steps:
step 4.1: the preparation process comprises the steps of selecting a second press (adopting a special drawing hydraulic press) with the pressure of not less than 500 tons, installing a drawing die corresponding to the specification of a product on the second press, and controlling the temperature of a blank entering a hot drawing forming procedure of a bar to be not lower than 900 ℃;
step 4.2: in the quick descending process, an upper die punch of a second press is quickly close to a blank to be hot-drawn and stretched, a workpiece is in a high-temperature state, and the next process is required before the temperature of the workpiece is reduced to 900 ℃;
step 4.3: in the stretching process, an upper die punch of a second press is controlled to slowly approach a blank to be subjected to hot drawing and stretching, and the blank is subjected to hot drawing and stretching, wherein the speed of the upper die punch is controlled to be 50-80 mm/s in the stretching process;
step 4.4: in the return process, the upper die punch of the second press is controlled to return to the initial position quickly, so that the time of one working cycle can be effectively shortened, and the working efficiency is improved;
step 4.5: and in the discharging process, a special mechanism ejects the formed workpiece to a preset position, and the workpiece is quickly taken by a manipulator and then transferred to the next procedure.
And 5: cylinder block blank modulation treatment process
Carrying out heat treatment on the blank after hot drawing forming, wherein the tempering temperature meets the requirement of the strength of a workpiece so as to achieve the comprehensive mechanical property index required by a nitrogen spring;
step 6: cylinder block blank surface treatment process
Carrying out surface treatment on the cylinder body blank after modulation treatment; specifically, the method comprises the following steps:
surface treatment 1: performing sand blasting treatment, namely performing air cooling after the hot-drawn blank is subjected to heat treatment, and then performing sand blasting treatment on the inner wall and the outer wall of the blank to clean a surface oxide layer, residual lubricant and the like;
surface treatment 2: and (3) phosphorization and saponification treatment, wherein the blank after being cleaned by sand blasting is transferred to a phosphorization and saponification process, and the process needs to adopt a phosphorization and saponification formula and flow suitable for cold extrusion of steel parts.
And 7: cylinder block blank cold-drawing forming process
Adopting corresponding cold-drawing dies according to different product specifications, carrying out cold-drawing and drawing molding on the cylinder body blank subjected to surface treatment at normal temperature by adopting a special drawing hydraulic machine, and controlling the reduction of area per pass to be below 20%; the method comprises the following specific steps:
step 7.1: a preparation process, namely selecting a third press (adopting a special drawing hydraulic press) with the pressure of not less than 800 tons, and installing a drawing die corresponding to the product specification on the third press;
step 7.2: in the quick descending process, an upper die punch of a third press is quickly close to a cylinder body blank to be subjected to cold drawing and stretching forming;
step 7.3: in the stretching process, an upper die punch of a third press is controlled to slowly approach a cylinder blank to be stretched and formed, the cylinder blank is subjected to cold drawing and stretching, and the speed of the upper die punch is controlled to be 10-25 mm/s in the stretching process so as to ensure the deformation time of a workpiece;
step 7.4: a return process, namely controlling an upper die punch of a third press to return to an initial position quickly;
step 7.5: and in the discharging process, a special mechanism ejects the formed workpiece to a preset position, and the workpiece is quickly taken by a manipulator and then transferred to the next procedure.
And 8: and a cylinder body blank machine processing procedure, wherein machining equipment is adopted to process the cylinder body blank to meet the requirements on size and performance.
And 8, the cylinder body blank machine processing procedure comprises a rough turning outer circle and inner hole process, a finish turning outer circle in-place process, a finish turning inner hole in-place and honing allowance reserving process, an inner hole honing process, a cylinder body bottom thread mounting hole processing process and an air inlet and outlet hole processing process, and the blackening treatment and QPQ salt bath composite treatment are further carried out on the surface of the workpiece after the cylinder body blank machine processing is finished.
In the embodiment, the preheated bar stock is subjected to extrusion forming, hot drawing and stretching, modulation treatment, surface treatment and cold drawing and stretching and then is machined and formed, so that the mechanical property, the physical property, the forging effect and the yield of finished products of the nitrogen spring cylinder body are greatly improved, the structure is stronger, and the tensile strength and the extensibility of cylinder body products are enhanced; then, the rough blank forming of the nitrogen spring cylinder body with a complex structure is realized through the working procedures of hot extrusion, hot drawing and stretching, cold drawing and stretching and the like, so that the overall stability of the cylinder body and the safety in the using process are greatly improved.
The technical solution provided by the present invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. The manufacturing process of the high-safety nitrogen spring cylinder body is characterized by comprising the following steps of:
step 1: a bar sawing step, namely selecting a cylinder body substrate according to the performance requirement of the nitrogen gas spring, and processing a bar meeting the requirement by adopting a numerical control sawing machine;
step 2: a bar heating procedure, namely heating the bar by using a heating furnace to enable the bar to be completely austenitized, and controlling the temperature to be 1150-1200 ℃ in the heating process;
and step 3: a bar hot extrusion molding process, wherein the heated bar is subjected to compression molding by using corresponding extrusion dies according to products of different specifications, the temperature of the bar in the compression molding process is not lower than 1150 ℃, and the reduction of area is not more than 50%;
and 4, step 4: a blank hot-drawing forming procedure, wherein the blank after extrusion prefabrication is subjected to hot-drawing stretching forming by adopting corresponding hot-drawing dies according to different product specifications, and the reduction of area per pass is controlled to be below 20% during hot-drawing forming;
and 5: a cylinder body blank modulation treatment procedure, wherein the blank after hot drawing forming is subjected to heat treatment so as to achieve the comprehensive mechanical property index required by the nitrogen spring;
step 6: a cylinder block blank surface treatment step of performing surface treatment on the cylinder block blank after the modulation treatment;
and 7: a cylinder body blank cold-drawing forming procedure, wherein corresponding cold-drawing dies are adopted according to different product specifications, the cylinder body blank subjected to surface treatment is subjected to cold-drawing stretching forming at normal temperature, and the reduction of area per pass is controlled to be below 20%;
and 8: and a cylinder body blank machine processing procedure, wherein machining equipment is adopted to process the cylinder body blank to meet the requirements on size and performance.
2. The manufacturing process of the high-safety nitrogen spring cylinder according to claim 1, characterized in that: in the step 1, the cylinder body base material is an alloy structural steel which meets the requirements of tensile strength being larger than or equal to 810MPa, yield strength being larger than or equal to 785MPa and impact power being larger than or equal to 47 AKV.
3. The manufacturing process of the high-safety nitrogen spring cylinder according to claim 2, characterized in that: and (3) the weight of the bar stock after sawing in the step (1) is not less than 120% of the weight of the finished part, and loss is reserved.
4. The manufacturing process of the high-safety nitrogen spring cylinder according to claim 1, characterized in that: and 2, adopting a medium-frequency induction type continuous heating furnace as the heating furnace.
5. The manufacturing process of the high-safety nitrogen spring cylinder according to claim 1, characterized in that: the hot extrusion molding process of the bar stock in the step 3 comprises the following specific steps:
step 3.1: a preparation process, namely selecting a first press with the pressure not less than 500 tons, and installing an extrusion die corresponding to the product specification on the first press;
step 3.2: in the rapid approaching process, an upper die punch of a first press is controlled to rapidly approach a bar to be pressed and formed;
step 3.3: the method comprises the following steps of (1) a pressing process, wherein an upper die punch of a first press is controlled to slowly approach a bar to be pressed and formed, the bar is pressed, and the speed of the upper die punch is controlled to be 50-80 mm/s in the pressing process;
step 3.4: a quick return process, namely controlling an upper die punch of the first press to quickly return to an initial position;
step 3.5: and in the blanking process, the blank workpiece formed by pressing is ejected to a preset position and transferred to the next procedure through a manipulator.
6. The manufacturing process of the high-safety nitrogen spring cylinder according to claim 1, characterized in that: the hot-drawing forming process of the blank in the step 4 comprises the following specific steps:
step 4.1: the preparation process comprises the steps of selecting a second press with the pressure not less than 500 tons, installing a stretching die corresponding to the product specification on the second press, and controlling the temperature of a blank entering a bar hot drawing forming procedure to be not lower than 900 ℃;
step 4.2: in the quick descending process, an upper die punch of a second press is quickly close to a blank to be subjected to hot drawing and stretching forming;
step 4.3: in the stretching process, an upper die punch of a second press is controlled to slowly approach a blank to be subjected to hot drawing and stretching, the blank is subjected to hot drawing and stretching, and the speed of the upper die punch is controlled to be 50-80 mm/s in the hot drawing and stretching process;
step 4.4: a return process, namely controlling an upper die punch of the second press to return to an initial position quickly;
step 4.5: and in the discharging process, the formed workpiece is ejected to a preset position, and the workpiece is quickly taken by a manipulator and then transferred to the next procedure.
7. The manufacturing process of the high-safety nitrogen spring cylinder according to claim 1, characterized in that: the cylinder body blank surface treatment process in the step 6 comprises a sand blasting process and a phosphorization saponification process, wherein the sand blasting process is used for carrying out sand blasting treatment on the inner wall and the outer wall of the prepared blank to clean the surface of the blank; and the phosphorization and saponification process is used for phosphorization and saponification of the blank subjected to sand blasting.
8. The manufacturing process of the high-safety nitrogen spring cylinder according to claim 1, characterized in that: the cold-drawing forming process of the cylinder block blank in the step 7 comprises the following specific steps:
step 7.1: a preparation process, namely selecting a third press with the pressure not less than 800 tons, and installing a drawing die corresponding to the product specification on the third press;
step 7.2: in the quick descending process, an upper die punch of a third press is quickly close to a cylinder body blank to be subjected to cold drawing and stretching forming;
step 7.3: in the stretching process, an upper die punch of a third press is controlled to slowly approach a cylinder blank to be stretched and formed, the cylinder blank is subjected to cold drawing and stretching, and the speed of the upper die punch is controlled to be 10-25 mm/s in the stretching process;
step 7.4: a return process, namely controlling an upper die punch of a third press to return to an initial position quickly;
step 7.5: and in the discharging process, the formed workpiece is ejected to a preset position and taken out through a manipulator.
9. The manufacturing process of the high-safety nitrogen spring cylinder according to claim 1, characterized in that: the cylinder body blank machine processing procedure in the step 8 comprises a rough turning outer circle and inner hole process, a finish turning outer circle in-place process, a finish turning inner hole in-place and honing allowance reserving process, an inner hole honing process, a cylinder body bottom thread mounting hole processing process and an air inlet and outlet hole processing process.
10. The manufacturing process of the high-safety nitrogen spring cylinder according to any one of claims 1 to 9, characterized in that: and 8, after the cylinder block blank is machined, performing blackening treatment and QPQ salt bath composite treatment on the surface of the workpiece.
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| CH687443A5 (en) * | 1994-02-25 | 1996-12-13 | Mn Maschinenbau & Engineering | Monobloc aluminium-can production method |
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| CN103282531A (en) * | 2010-12-22 | 2013-09-04 | 昭和电工株式会社 | Method for producing formed material for brake piston |
| CN104785563A (en) * | 2015-03-30 | 2015-07-22 | 北京机电研究所 | Precise extruding and forming method for long barrel-shaped component with base |
| KR20160114261A (en) * | 2015-03-24 | 2016-10-05 | 박준혁 | Compression tank production process and the structure of the agricultural power sprayer |
| CN111037216A (en) * | 2019-12-06 | 2020-04-21 | 深圳市伸展精密科技有限公司 | Processing technology of nitrogen spring cylinder barrel |
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2020
- 2020-10-09 CN CN202011074859.9A patent/CN112247052B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH687443A5 (en) * | 1994-02-25 | 1996-12-13 | Mn Maschinenbau & Engineering | Monobloc aluminium-can production method |
| CN1562558A (en) * | 2004-03-18 | 2005-01-12 | 十堰兴升工贸有限公司 | Technique for manufacturing spring cylinder through nitrogen gas |
| CN103282531A (en) * | 2010-12-22 | 2013-09-04 | 昭和电工株式会社 | Method for producing formed material for brake piston |
| KR20160114261A (en) * | 2015-03-24 | 2016-10-05 | 박준혁 | Compression tank production process and the structure of the agricultural power sprayer |
| CN104785563A (en) * | 2015-03-30 | 2015-07-22 | 北京机电研究所 | Precise extruding and forming method for long barrel-shaped component with base |
| CN111037216A (en) * | 2019-12-06 | 2020-04-21 | 深圳市伸展精密科技有限公司 | Processing technology of nitrogen spring cylinder barrel |
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