CN109093330B - Water expansion forming process of automobile silencer - Google Patents
Water expansion forming process of automobile silencer Download PDFInfo
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- CN109093330B CN109093330B CN201810983313.1A CN201810983313A CN109093330B CN 109093330 B CN109093330 B CN 109093330B CN 201810983313 A CN201810983313 A CN 201810983313A CN 109093330 B CN109093330 B CN 109093330B
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- water expansion
- pressure
- die
- pipe fitting
- product
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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
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
Abstract
The invention discloses a water expansion forming process of an automobile silencer, which is characterized by comprising the following process steps: cutting the stainless steel pipe and removing burrs; and (4) bending the stainless steel pipe fitting by using a pipe bending machine according to the appearance of the product. The bent pipe fitting is subjected to solid melting treatment, then two ends of the pipe fitting are shaped by plugs so as to keep the outer circular shapes of the two ends unchanged, the middle part is flattened at one time by using a cold pressing die and a hydraulic press, and the pressure applied by the hydraulic press is more than 315 tons; after the product is subjected to solid melting treatment again, the blank is placed into a water expansion die, a water expansion machine is used for applying pressure to the die, two ends of the die are pushed by two pressure cylinders to extrude a pipe fitting, saponification liquid with the pressure of 20MPa is injected into an inner hole of the punch, and after water expansion forming, a workpiece is cut off from the middle part to form two identical semi-finished products, wherein the forming parameters of the water expansion machine are set as follows: the water expansion machine applies pressure: 315 tons, and the pressure intensity is 20 MPa; the output pressure of the two pressure cylinders is more than 20 MPa.
Description
Technical Field
The invention relates to the field of water expansion forming, in particular to a water expansion forming process of an automobile silencer.
Background
The muffler for the automobile is an important part on the automobile, the muffler needs to adopt a high temperature resistant part because the muffler works at a high temperature for a long time, and the national emission requirements are more and more strict, so the gas emitted from the muffler for the automobile needs to be post-treated, a urea solution is generally adopted to treat harmful substances in the gas, the urea has corrosiveness, so the material requirement on the muffler is higher, meanwhile, in order to prevent corrosion, a stainless steel material with corrosion resistance and rust resistance is generally adopted, the structure of the muffler is more in appearance types and complicated in trend according to different automobile models, and in order to meet the requirement of vehicle compactness, the shape is mostly irregular, the prior art generally adopts stretch forming, and for irregular switches, a plurality of regular products are welded into an integral part in a tailor welding mode, the existing process has the defects that the wall of a common product is very thin, the spliced welding part is easy to crack, the requirement on welding is high, the manufacturing precision requirement of a plurality of product combinations is high, meanwhile, a large number of tools are needed to ensure the precision requirement of the product combinations, the production process is complex, the product appearance is not good, only products with simple combined structures can be manufactured, relatively complex products cannot be completed, most parts can be manufactured only by adopting a precision casting molding process, the energy consumption is high, the cost is high, the process is complex, the production period is long, the service life of the product is short, and the precision is difficult to ensure.
Disclosure of Invention
The invention discloses a water expansion forming process of an automobile silencer, which is used for solving the defects of the prior art.
In order to solve the problems, the technical solution of the invention is as follows:
a water expansion forming process of an automobile muffler comprises the following process steps:
(1) cutting off the stainless steel pipe and removing burrs;
(2) bending the stainless steel pipe fitting by using a pipe bending machine according to the appearance of the product;
(3) the bent pipe fitting is subjected to solid melting treatment, then two ends of the pipe fitting are shaped by plugs so as to keep the outer circular shapes of the two ends unchanged, the middle part is flattened at one time by using a cold pressing die and a hydraulic press, and the pressure applied by the hydraulic press is more than 315 tons;
(4) after the product is subjected to solid melting treatment again, the blank is placed into a water expansion die, a water expansion machine is used for applying pressure to the die, two ends of the die are pushed by two pressure cylinders to extrude a pipe fitting, saponification liquid with the pressure of 20MPa is injected into an inner hole of the punch, and after water expansion forming, a workpiece is cut off from the middle part to form two identical semi-finished products, wherein the forming parameters of the water expansion machine are set as follows:
the water expansion machine applies pressure: 315 tons, and the pressure intensity is 20 MPa;
the output pressure of the two pressure cylinders is more than 20 MPa;
the volume of the water tank is more than 2L, and the water replenishing pressure intensity is less than 5 MPa;
(5) machining the semi-finished product subjected to the water expansion forming;
(6) grinding and high-frequency polishing the semi-finished product;
(7) cleaning and anodizing;
(8) and drying at constant temperature by ultrasonic waves to form a final silencer product.
One end of the silencer is round, and the other end of the silencer is of a square structure.
The invention has the beneficial effects that: the stainless steel muffler product is formed by adopting a water expansion forming process, and the whole process adopts a cold machining mode, so that the appearance quality of the finished surface of the product is improved, the processing speed is high, the production efficiency is improved, the manufacturing cost of the product is reduced, the formed product has stable rigidity, firm structure, no gap, no internal stress, no sand hole, no internal injury, precise water expansion, environmental protection, high production efficiency, energy conservation and consumption reduction, the product can be formed at one time, the main structure does not adopt a tailor welding structure, and the service life of the product is long.
Drawings
FIG. 1 is a schematic view of the muffler structure of the present invention;
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
The invention comprises the following process steps:
(1) cutting off the stainless steel pipe and removing burrs;
(2) bending the stainless steel pipe fitting by using a pipe bending machine according to the appearance of the product;
(3) the bent pipe fitting is subjected to solid melting treatment, then two ends of the pipe fitting are shaped by plugs so as to keep the outer circular shapes of the two ends unchanged, the middle part is flattened at one time by using a cold pressing die and a hydraulic press, and the pressure applied by the hydraulic press is more than 315 tons;
(4) after the product is subjected to solid melting treatment again, the blank is placed into a water expansion die, a water expansion machine is used for applying pressure to the die, two ends of the die are pushed by two pressure cylinders to extrude a pipe fitting, saponification liquid with the pressure of 20MPa is injected into an inner hole of the punch, and after water expansion forming, a workpiece is cut off from the middle part to form two identical semi-finished products, wherein the forming parameters of the water expansion machine are set as follows:
the water expansion machine applies pressure: 315 tons, and the pressure intensity is 20 MPa;
the output pressure of the two pressure cylinders is more than 20 MPa;
the volume of the water tank is more than 2L, and the water replenishing pressure intensity is less than 5 MPa;
(5) machining the semi-finished product subjected to the water expansion forming;
(6) grinding and high-frequency polishing the semi-finished product;
(7) cleaning and anodizing;
(8) and drying at constant temperature by ultrasonic waves to form a final silencer product.
One end of the silencer is round, and the other end of the silencer is of a square structure.
In practical application, a water expansion forming cold machining process is adopted, the silencer which can only adopt precision casting forming stainless steel originally is machined in a cold machining mode, the manufactured product is high in precision, attractive in appearance, high in forming speed, high in production efficiency, stable in rigidity, firm in structure, free of gap, internal stress, sand hole and internal injury, precise water expansion, environment-friendly, high in production efficiency, energy-saving and consumption-reducing.
When the stainless steel silencer is formed by water expansion, because the water expansion process has certain limitations, the forming parameters directly influence the quality of the formed product of the appearance of the product, the water expansion forming needs to be carried out according to the material characteristics of the stainless steel, the silencer products are generally large, the common products are formed by combining different cross-sectional shapes, the product appearance needs to be cold-processed in advance, the product has a rough shape, and a blank can be placed into a die, otherwise, on one hand, the product cannot be placed into the die for forming, on the other hand, the raw material is a stainless steel pipe to form a square shape, the length of the material needing to be extended is long, and other parts of the blank can be influenced to a certain degree in the extending process of the material, and the situation of tension fracture can occur when the water expansion forming is directly adopted, therefore, preforming is needed to be performed in advance, after the approximate shape of the product is formed, after solid melting treatment is performed, the blank is placed into a water expansion die, a water expansion machine is used for applying pressure to the die, two ends of the die push a punch to extrude a pipe fitting through two pressure cylinders, saponification liquid with the pressure of 20MPa is injected into an inner hole of the punch, after water expansion forming, a workpiece is cut off from the middle part, and two pieces are formed, wherein the forming parameters of the water expansion machine are set as follows: the water expansion machine applies pressure: 315 tons, and the pressure intensity is 20 MPa; the output pressure of the two pressure cylinders is more than 20 MPa; the volume of the water cylinder is more than 2L, the water replenishing pressure intensity is less than 5MPa, and through the arrangement of the forming parameters, the surface quality of the manufactured product is good, the drawing crack phenomenon is avoided, the forming time is short, the efficiency is high, the whole process is free of a hot processing technology, the wall thickness of the product can be below 0.5mm, the weight is light, the main body part is not welded, and the service life is long.
The above-mentioned embodiments are preferred embodiments of the present invention, and the present invention is not limited thereto, and any other modifications or equivalent substitutions that do not depart from the technical spirit of the present invention are included in the scope of the present invention.
Claims (2)
1. The water expansion forming process of the automobile muffler is characterized by comprising the following process steps:
(1) cutting off the stainless steel pipe and removing burrs;
(2) bending the stainless steel pipe fitting by using a pipe bending machine according to the appearance of the product;
(3) the bent pipe fitting is subjected to solid melting treatment, then two ends of the pipe fitting are shaped by plugs so as to keep the outer circular shapes of the two ends unchanged, the middle part is flattened at one time by using a cold pressing die and a hydraulic press, and the pressure applied by the hydraulic press is more than 315 tons;
(4) after solid melting treatment is carried out on the product again, the blank is placed into a water expansion die, a water expansion machine is adopted to apply pressure to the die, two ends of the die are pushed by two pressure cylinders to extrude a pipe fitting, a saponification liquid with the pressure of 20MPa is injected into an inner hole of the punch, after water expansion forming, a workpiece is cut off from the middle part, two identical semi-finished products are formed, and forming parameters of the water expansion machine are set as follows:
the water expansion machine applies pressure: 315 tons, and the pressure intensity is 20 MPa;
the output pressure of the two pressure cylinders is more than 20 MPa;
the volume of the water tank is more than 2L, and the water replenishing pressure intensity is less than 5 MPa;
(5) machining the semi-finished product subjected to the water expansion forming;
(6) grinding and high-frequency polishing the semi-finished product;
(7) cleaning and anodizing;
(8) and drying at constant temperature by ultrasonic waves to form a final silencer product.
2. The water swelling forming process of the muffler for the automobile according to claim 1, wherein: one end of the silencer is round, and the other end of the silencer is of a square structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810983313.1A CN109093330B (en) | 2018-08-27 | 2018-08-27 | Water expansion forming process of automobile silencer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810983313.1A CN109093330B (en) | 2018-08-27 | 2018-08-27 | Water expansion forming process of automobile silencer |
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| Publication Number | Publication Date |
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| CN109093330A CN109093330A (en) | 2018-12-28 |
| CN109093330B true CN109093330B (en) | 2021-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810983313.1A Active CN109093330B (en) | 2018-08-27 | 2018-08-27 | Water expansion forming process of automobile silencer |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111546002A (en) * | 2020-05-11 | 2020-08-18 | 明达铝业科技(太仓)有限公司 | Integrated forming process for producing rear controller shell of lower tube of electric bicycle |
| CN113182395A (en) * | 2021-04-29 | 2021-07-30 | 佛山市南海区显威五金塑料有限公司 | Hydraulic bulging processing technology and bulging die for stainless steel faucet bent pipe |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007245180A (en) * | 2006-03-15 | 2007-09-27 | Jfe Steel Kk | Method and apparatus for hydroforming metallic tube |
| CN203604012U (en) * | 2013-11-19 | 2014-05-21 | 浙江吉利汽车研究院有限公司 | Automobile muffler |
| CN107263134A (en) * | 2017-05-04 | 2017-10-20 | 西安优耐特容器制造有限公司 | A kind of supporting tool and forming method for thin-wall bend cold forming |
| CN107755512A (en) * | 2016-08-20 | 2018-03-06 | 无锡明豪汽车轻量化技术应用有限公司 | A kind of tubular member moulding process |
| CN107900181A (en) * | 2017-12-07 | 2018-04-13 | 平湖爱驰威汽车零部件有限公司 | A kind of automobile tail pipe former and application method |
| CN107931401A (en) * | 2017-11-30 | 2018-04-20 | 苏州紫荆清远新能源汽车技术有限公司 | The molding machine and method of a kind of bodywork parts |
-
2018
- 2018-08-27 CN CN201810983313.1A patent/CN109093330B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007245180A (en) * | 2006-03-15 | 2007-09-27 | Jfe Steel Kk | Method and apparatus for hydroforming metallic tube |
| CN203604012U (en) * | 2013-11-19 | 2014-05-21 | 浙江吉利汽车研究院有限公司 | Automobile muffler |
| CN107755512A (en) * | 2016-08-20 | 2018-03-06 | 无锡明豪汽车轻量化技术应用有限公司 | A kind of tubular member moulding process |
| CN107263134A (en) * | 2017-05-04 | 2017-10-20 | 西安优耐特容器制造有限公司 | A kind of supporting tool and forming method for thin-wall bend cold forming |
| CN107931401A (en) * | 2017-11-30 | 2018-04-20 | 苏州紫荆清远新能源汽车技术有限公司 | The molding machine and method of a kind of bodywork parts |
| CN107900181A (en) * | 2017-12-07 | 2018-04-13 | 平湖爱驰威汽车零部件有限公司 | A kind of automobile tail pipe former and application method |
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| CN109093330A (en) | 2018-12-28 |
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