CN101929586A - Cooling water pipe for electric vehicle and production technology thereof - Google Patents

Cooling water pipe for electric vehicle and production technology thereof Download PDF

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Publication number
CN101929586A
CN101929586A CN2010102571926A CN201010257192A CN101929586A CN 101929586 A CN101929586 A CN 101929586A CN 2010102571926 A CN2010102571926 A CN 2010102571926A CN 201010257192 A CN201010257192 A CN 201010257192A CN 101929586 A CN101929586 A CN 101929586A
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Prior art keywords
weight portions
water
rubber
cooling tube
electric vehicle
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Granted
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CN2010102571926A
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Chinese (zh)
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CN101929586B (en
Inventor
蒋亨雷
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Zhejiang Juhe Rubber Technology Co., Ltd.
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蒋亨雷
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/92Measuring, controlling or regulating

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The invention discloses a cooling water pipe for electric vehicle and production technology thereof, wherein a rubber pipe consists of an inner rubber layer, a fiber line reinforcement layer and an outer rubber layer from inside outwards. The cooling water pipe is prepared by the following steps of: (1) feeding rubber components of the inner and outer rubber layers into an internal mixer to mix the rubber components; (2) performing a fast testing on the semi-finished rubber after the rubber components are mixed; (3) putting the rubber into a 90 extruder with a straight machine head to extrude the inner rubber layer; (4) knitting a fiber line reinforcement layer on the extruded rubber layer of the inner pipe by using a knitter; (5) on the 90 extruder, extruding the semi-product in the step (4) out of the outer rubber layer by using a T-shaped machine head; (6) cutting the rubber pipe off and vulcanizing the pipe in a steam cylinder; (7) washing the rubber pipe and cutting the head of rubber pipe; and (8) performing injection molding and fast connecting the head to obtain the finished product. The production technology is simplified, the cost is saved and the operation is more convenient; meanwhile, the bonding is firm and the quality of product is good.

Description

The water-cooling tube and the production technology thereof that are used for electric vehicle
Technical field
The present invention relates to the auto parts machinery field, specifically is a kind of water-cooling tube and production technology thereof that is used for electric vehicle.
Background technique
Since expanding economy, the raising of people's living standard, and automobile has become one of traffic tool of people.Along with improving constantly of people's environmental consciousness, awareness of saving energy, and the rising steadily of global oil price, automotive industry is sought the alternative energy.The low-carbon environment-friendly automobile becomes a kind of alternative middle vehicle, and electric vehicle is as the vehicle of low-carbon environment-friendly economy, will be after the direction of automobile industry development.Cooling system at electric vehicle has comprised radiator cooling system and engine-cooling system, wherein used a lot of water-cooling tubes, as between motor and the radiator, between radiator and the water pump, between water pump and the oil cooler, between oil cooler and the radiator.
When the formula of rubber hose design of water-cooling tube, consider and performances such as cooling liquid and anti-electrooptics that especially anti-electrooptics performance is the distinctive performance of electric vehicle water-cooling tube.In other words, the water-cooling tube inwall has coolant flow, so the necessary cold-resistant but liquid medium of glue in the water pipe; Sebific duct is through certain current testing, and whether the checking sizing material ftractures or sizing material becomes the obstruction that granule causes system after whether separating.In addition, also will carry out an oil-proof varnish test, promptly in order to verify the prescription of sebific duct, sizing material is wanted media such as heat-resisting water, anti-cooling liquid, and whether sizing material becomes the microwave particle for a long time under the effect of high temperature or cooling liquid, thereby causes performance decrease.
Traditional water-cooling tube is normally made by sebific duct, and the employed material of its glue-line is generally ethylene propylene diene rubber, and sulphide is sulphur.If but this sizing material is used for the cooling system of electric vehicle, just exist to lack anti-cooling liquid and anti-electrooptics performance.Therefore, the sizing material inwall ftractures easily or sizing material becomes granule after the separation easily, thereby causes the obstruction of cooling system.
In addition, the flow of existing water-cooling tube is: the sizing material heat refining that mating gets togather → through extruder extrude inner glue layer → send into carry out in the sulfurizing pot semi-cure → carrying out fiber twine in kiss-coating starch → send drying room drying → glue-line through T type extruder puts outside → send in the sulfurizing pot once more and vulcanize → clean → cut → test package puts in storage.But this flow complexity, operation is more, correspondingly increases cost of production; Simultaneously, kiss-coating is starched the product that this technology obtains when carrying out the fiber winding, its outer glue and fibrolaminar bonding insecure, thus cause poor product quality.
Summary of the invention
Technical problem to be solved by this invention is, a kind of anti-cooling liquid and anti-electrooptics performance are provided, thereby avoids occurring the glue-line cracking or separate producing the microwave particle and agreeing with the water-cooling tube that is used for electric vehicle of the blocking phenomenon of system.
For solving the problems of the technologies described above, the water-cooling tube that is used for electric vehicle provided by the invention, comprise the water-cooling tube that rubber is made, pipe rubber layer, fibre threads enhancement layer and outer tube rubber layer in its sebific duct is followed successively by from inside to outside, described inner and outer pipe rubber layer comprises following component:
Ethylene propylene diene rubber 100 weight portions
Peroxide vulcanizing agent 5 weight portions
Crosslinking agent TAIC 2.5 weight portions
Anti-aging agent RD 2 weight portions
Reinforcing agent 550 80 weight portions
Plasticizing agent 2,250 12 weight portions
Stearic 1.5 weight portions
Add up to: 203 weight portions
Adopt the sebific duct of this component, utilize the heat resistance of peroxide vulcanizing agent to improve heat resistance shortening cure time, in other words, the heat resisting temperature of traditional sebific duct with sulfur cross-linking is 150 degree, and is 170 to spend with the heat resisting temperature of the sebific duct of peroxide cure, simultaneously, the required time of traditional sulfur cross-linking is 40 minutes, and with the required time of peroxide cure be 20 minutes, enhance productivity greatly, save cost of production.
As improvement, described fibre threads enhancement layer is the aramid line layer.Adopting this material as enhancement layer, is the characteristic that intensity height, elongation percentage are little, the pulse performance is good of giving full play to aramid line, makes the intensity of water-cooling tube higher.
As further improvement, an end of described water-cooling tube has the rapid pipe joint that plastics are made, and described rapid pipe joint and water-cooling tube are one.Described rapid pipe joint can be two pass joints, also can be tee union.After adopting this structure, owing to had rapid pipe joint in the end of water-cooling tube, and rapid pipe joint and water-cooling tube are one, therefore, the position that only needs rapid pipe joint to be connected required connection when assembling gets final product, and dwindles installing space greatly, also makes and installs easily; Simultaneously, the integral structure of rapid pipe joint and water-cooling tube has avoided the joint that the phenomenon of leaking takes place.
Another technical problem to be solved by this invention is, provides that a kind of production technology is simple, cost is low, the production technology of the water-cooling tube that is used for autonomous driving vehicle of good product quality.
For solving the problems of the technologies described above, the production technology that is used for the water-cooling tube of electric vehicle provided by the invention, it may further comprise the steps:
1. by following component sizing material is sent into mixer mixing;
The component of described sizing material is:
Ethylene propylene diene rubber 100 weight portions
Peroxide vulcanizing agent 5 weight portions
Crosslinking agent TAIC 2.5 weight portions
Anti-aging agent RD 2 weight portions
Reinforcing agent 550 80 weight portions
Plasticizing agent 2,250 12 weight portions
Stearic 1.5 weight portions
Add up to: 203 weight portions
2. the sizing material after the banburying is carried out fast seizure test, specify index parameter to control Mooney viscosity, the time of scorch of sizing material, so that rubber and bonding with aramid line in the expressing technique in the operation of back;
3. 90 extruders of sizing material being put into straight type head are extruded inner glue layer;
4. knitting machine knitted fibers line enhancement layer on the interior pipe rubber layer of extruding of selecting the respective needle number according to the internal diameter and the external diameter of pipe obtains semi-finished product;
5. glue-line outside extruding outside the semi-finished product that 4. step obtains with T type head on 90 extruders;
6. sebific duct cuts off, the digester (-tor) sulfuration;
7. sebific duct washs, cuts head, obtains sebific duct;
8. on plastic injection equipment with rapid pipe joint in the injection moulding in the sebific duct end, obtain finished product.
The 1. middle sizing material of described step adopts the method for reverse mixing, adopt the rotor speed of 15~20RPM, the entering water temp of cooling water is controlled at below 20 ℃, plastic emitting temperature after mixing is 120 ℃~130 ℃, can allow filler and auxiliary agent to mix under the mechanism of rotor, vulcanzing agent adds at last in advance.
Described step 3. in the head temperature of straight type head be that 65 ℃, the temperature of spout are that 45 ℃, the external diameter of interior pipe are 5-60mm.
The described step 4. pitch of middle knitting machine is 3-5mm.
Described step 5. in the head temperature of T type head be that 70 ℃, the temperature of spout are that 45 ℃, the external diameter of outer tube are 10-80mm.
Described cure time is 20 minutes.
After adopting above-described production technology, the present invention compared with prior art has the following advantages:
1) since sebific duct after extruder is extruded inner glue layer, directly carrying out fibre threads twines, need not hanging and drying process, wrap wire is direct and inner glue layer is bonding, and glue-line outside directly extruding on fiber-reinforced layer through extruder more directly reaches bonding effect, therefore simplified production technology, saved cost, simultaneously bonding firm, good product quality;
2) step 1. in sizing material adopt the method for reverse mixing to mix, be to prevent the overheated incipient scorch of sizing material, can allow filler and auxiliary agent under the mechanism of rotor, to mix in advance, can not cause the rising of temperature like this; Peroxide vulcanizing agent adds at last, is to prolong mixing time to obtain best melting effect, and like this, the sizing material after the banburying has the good compression stress releasing property, uses the back to keep good penetration through the long period in multiple fluid.
Description of drawings
Fig. 1 is the cross section structure schematic representation that the present invention is used for the water-cooling tube sebific duct of electric vehicle;
Fig. 2 is the structural representation that invention is used for the water-cooling tube of electric vehicle.
Wherein: 1, water-cooling tube; 2, rapid pipe joint; 3, interior pipe rubber layer; 4, fibre threads enhancement layer; 5, outer tube rubber layer.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is done explanation in further detail.
Be used for by Fig. 1, the present invention shown in Figure 2 electric vehicle water-cooling tube structural representation as can be known, it comprises the water-cooling tube 1 that rubber is made, pipe rubber layer 3, fibre threads enhancement layer 4 and outer tube rubber layer 5 in its sebific duct is followed successively by from inside to outside, described inner and outer pipe rubber layer comprises following component:
Ethylene propylene diene rubber 100 weight portions
Peroxide vulcanizing agent 5 weight portions
Crosslinking agent TAIC 2.5 weight portions
Anti-aging agent RD 2 weight portions
Reinforcing agent 550 80 weight portions
Plasticizing agent 2,250 12 weight portions
Stearic 1.5 weight portions
Add up to: 203 weight portions
Described fibre threads enhancement layer 4 is aramid line layers.
One end of described water-cooling tube 1 has the rapid pipe joint 2 that plastics are made, and described rapid pipe joint 2 is one with water-cooling tube 1.Described rapid pipe joint 2 can be two pass joints, also can be tee union, and it is fixed that this can come according to the as installed needs.
The present invention is used for the production technology of the water-cooling tube of electric vehicle, and it may further comprise the steps:
1. by following component sizing material is sent into mixer mixing;
The component of described sizing material is:
Ethylene propylene diene rubber 100 weight portions
Peroxide vulcanizing agent 5 weight portions
Crosslinking agent TAIC 2.5 weight portions
Anti-aging agent RD 2 weight portions
Reinforcing agent 550 80 weight portions
Plasticizing agent 2,250 12 weight portions
Stearic 1.5 weight portions
Add up to: 203 weight portions
2. the sizing material after the banburying is carried out fast seizure test, specify index parameter to control Mooney viscosity, the time of scorch of sizing material;
3. 90 extruders of sizing material being put into straight type head are extruded inner glue layer;
4. knitting machine knitted fibers line enhancement layer on the interior pipe rubber layer of extruding of selecting the respective needle number according to the internal diameter and the external diameter of pipe obtains semi-finished product;
5. glue-line outside extruding outside the semi-finished product that 4. step obtains with T type head on 90 extruders;
6. sebific duct cuts off, the digester (-tor) sulfuration;
7. sebific duct washs, cuts head, obtains sebific duct;
8. on plastic injection equipment with rapid pipe joint in the injection moulding in the sebific duct end, obtain finished product.
The 1. middle sizing material of described step adopts the method for reverse mixing, adopt the rotor speed of 15~20RPM, the entering water temp of cooling water is controlled at below 20 ℃, plastic emitting temperature after mixing is 120 ℃~130 ℃, can allow filler and auxiliary agent to mix under the mechanism of rotor, vulcanzing agent adds at last in advance.
Described step 3. in the head temperature of straight type head be that 65 ℃, the temperature of spout are that 45 ℃, the external diameter of interior pipe are 5-60mm.
The described step 4. pitch of middle knitting machine is 3-5mm.
Described step 5. in the head temperature of T type head be that 70 ℃, the temperature of spout are that 45 ℃, the external diameter of outer tube are 10-80mm.
Described cure time is 20 minutes.

Claims (10)

1. water-cooling tube that is used for electric vehicle, comprise the water-cooling tube (1) that rubber is made, pipe rubber layer (3), fibre threads enhancement layer (4) and outer tube rubber layer (5) in its sebific duct is followed successively by from inside to outside, it is characterized in that: described inner and outer pipe rubber layer comprises following component:
Ethylene propylene diene rubber 100 weight portions
Peroxide vulcanizing agent 5 weight portions
Crosslinking agent TAIC 2.5 weight portions
Anti-aging agent RD 2 weight portions
Reinforcing agent 550 80 weight portions
Plasticizing agent 2,250 12 weight portions
Stearic 1.5 weight portions
Add up to: 203 weight portions
2. the water-cooling tube that is used for electric vehicle according to claim 1 is characterized in that: described fibre threads enhancement layer (4) is the aramid line layer.
3. the water-cooling tube that is used for electric vehicle according to claim 1 is characterized in that: an end of described water-cooling tube (1) has the rapid pipe joint (2) that plastics are made, and described rapid pipe joint (2) is one with water-cooling tube (1).
4. the water-cooling tube that is used for electric vehicle according to claim 3 is characterized in that: described rapid pipe joint (2) can be two pass joints, also can be tee union.
5. production technology that is used for the water-cooling tube of electric vehicle, it is characterized in that: it may further comprise the steps:
1. by following component sizing material is sent into mixer mixing;
The component of described sizing material is:
Ethylene propylene diene rubber 100 weight portions
Peroxide vulcanizing agent 5 weight portions
Crosslinking agent TAIC 2.5 weight portions
Anti-aging agent RD 2 weight portions
Reinforcing agent 550 80 weight portions
Plasticizing agent 2,250 12 weight portions
Stearic 1.5 weight portions
Add up to: 203 weight portions
2. the sizing material after the banburying is carried out fast seizure test, specify index parameter to control Mooney viscosity, the time of scorch of sizing material;
3. 90 extruders of sizing material being put into straight type head are extruded inner glue layer;
4. knitting machine knitted fibers line enhancement layer on the interior pipe rubber layer of extruding of selecting the respective needle number according to the internal diameter and the external diameter of pipe obtains semi-finished product;
5. glue-line outside extruding outside the semi-finished product that 4. step obtains with T type head on 90 extruders;
6. sebific duct cuts off, the digester (-tor) sulfuration;
7. sebific duct washs, cuts head, obtains sebific duct;
8. on plastic injection equipment with rapid pipe joint in the injection moulding in the sebific duct end, obtain finished product.
6. the production technology that is used for the water-cooling tube of electric vehicle according to claim 5, it is characterized in that: the 1. middle sizing material of described step adopts the method for reverse mixing, adopt the rotor speed of 15~20RPM, the entering water temp of cooling water is controlled at below 20 ℃, plastic emitting temperature after mixing is 120 ℃~130 ℃, can allow filler and auxiliary agent to mix under the mechanism of rotor, vulcanzing agent adds at last in advance.
7. the production technology that is used for the water-cooling tube of electric vehicle according to claim 5 is characterized in that: described step 3. in the head temperature of straight type head be that 65 ℃, the temperature of spout are that 45 ℃, the external diameter of interior pipe are 5-60mm.
8. the production technology that is used for the water-cooling tube of electric vehicle according to claim 5 is characterized in that: the described step 4. pitch of middle knitting machine is 3-5mm.
9. the production technology that is used for the water-cooling tube of electric vehicle according to claim 5 is characterized in that: described step 5. in the head temperature of T type head be that 70 ℃, the temperature of spout are that 45 ℃, the external diameter of outer tube are 10-80mm.
10. the production technology that is used for the water-cooling tube of electric vehicle according to claim 5 is characterized in that: described cure time is 20 minutes.
CN2010102571926A 2010-08-19 2010-08-19 Cooling water pipe for electric vehicle and production technology thereof Expired - Fee Related CN101929586B (en)

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Application Number Priority Date Filing Date Title
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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102305317A (en) * 2011-08-18 2012-01-04 浙江峻和橡胶科技有限公司 Rubber hose for turbocharging air pump and manufacturing method for rubber hose
CN102305319A (en) * 2011-09-01 2012-01-04 宁波丰茂汽车零部件有限公司 Automotive rubber tube applied to silicon controlled rectifier (SCR) and production process for automotive rubber tube
CN102305318A (en) * 2011-08-18 2012-01-04 浙江峻和橡胶科技有限公司 Cooling water pipe and manufacturing method thereof
CN102588685A (en) * 2011-12-16 2012-07-18 无锡二橡胶股份有限公司 Rubber tube for hydrogen-powered vehicles
CN102628530A (en) * 2012-04-06 2012-08-08 浙江峻和橡胶科技有限公司 Engine fuel pipe and production process thereof
CN103266947A (en) * 2013-06-03 2013-08-28 宁波丰茂汽车零部件有限公司 Overtemperature resistant turbocharging radiator water pipe and producing process thereof
CN103277611A (en) * 2013-05-27 2013-09-04 宁波丰茂汽车零部件有限公司 Heavy-caliber radiator metal tube assembly and manufacturing technique thereof
CN105131639A (en) * 2015-09-18 2015-12-09 南通联恒新材料有限公司 Manufacturing process for hard engineering plastic
CN106287022A (en) * 2016-08-25 2017-01-04 焦作恒荣科技有限公司 A kind of rubber tube for turbo charged air pump and manufacture method thereof
CN112519284A (en) * 2020-12-02 2021-03-19 上海华林特种胶管有限公司 Method for manufacturing steel-making converter oxygen lance cooling water rubber pipe
CN112646278A (en) * 2020-12-02 2021-04-13 上海华林特种胶管有限公司 Method for vulcanizing oxygen lance cooling water rubber pipe of steel-making converter
CN112677522A (en) * 2020-12-18 2021-04-20 中国第一汽车股份有限公司 Preparation method of high-temperature-resistant low-pressure-variable cooling rubber pipe

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CN1410698A (en) * 2002-11-27 2003-04-16 四川大学 Steel plastic composite hot melt spigot and faucel pipe fitting used for aluminium plastic composite pipe pipe line connection
CN1851307A (en) * 2006-05-11 2006-10-25 蒋亨雷 Pneumatic brake pipe, and its manufacturing method
CN101660636A (en) * 2009-09-21 2010-03-03 浙江峻和橡胶科技有限公司 Oil-cooling pipe of automatic gearbox and production process thereof

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JPH01275127A (en) * 1988-04-28 1989-11-02 Tokai Rubber Ind Ltd Method and device for manufacturing fiber-reinforced rubber hose
CN1410698A (en) * 2002-11-27 2003-04-16 四川大学 Steel plastic composite hot melt spigot and faucel pipe fitting used for aluminium plastic composite pipe pipe line connection
CN1851307A (en) * 2006-05-11 2006-10-25 蒋亨雷 Pneumatic brake pipe, and its manufacturing method
CN101660636A (en) * 2009-09-21 2010-03-03 浙江峻和橡胶科技有限公司 Oil-cooling pipe of automatic gearbox and production process thereof

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102305318B (en) * 2011-08-18 2013-04-10 浙江峻和橡胶科技有限公司 Cooling water pipe and manufacturing method thereof
CN102305318A (en) * 2011-08-18 2012-01-04 浙江峻和橡胶科技有限公司 Cooling water pipe and manufacturing method thereof
CN102305317A (en) * 2011-08-18 2012-01-04 浙江峻和橡胶科技有限公司 Rubber hose for turbocharging air pump and manufacturing method for rubber hose
CN102305319A (en) * 2011-09-01 2012-01-04 宁波丰茂汽车零部件有限公司 Automotive rubber tube applied to silicon controlled rectifier (SCR) and production process for automotive rubber tube
CN102588685A (en) * 2011-12-16 2012-07-18 无锡二橡胶股份有限公司 Rubber tube for hydrogen-powered vehicles
CN102628530B (en) * 2012-04-06 2013-09-18 浙江峻和橡胶科技有限公司 Production process of engine fuel pipe
CN102628530A (en) * 2012-04-06 2012-08-08 浙江峻和橡胶科技有限公司 Engine fuel pipe and production process thereof
CN103277611A (en) * 2013-05-27 2013-09-04 宁波丰茂汽车零部件有限公司 Heavy-caliber radiator metal tube assembly and manufacturing technique thereof
CN103277611B (en) * 2013-05-27 2014-12-31 宁波丰茂汽车零部件有限公司 Heavy-caliber radiator metal tube assembly and manufacturing technique thereof
CN103266947A (en) * 2013-06-03 2013-08-28 宁波丰茂汽车零部件有限公司 Overtemperature resistant turbocharging radiator water pipe and producing process thereof
CN103266947B (en) * 2013-06-03 2015-03-25 宁波丰茂汽车零部件有限公司 Overtemperature resistant turbocharging radiator water pipe and producing process thereof
CN105131639A (en) * 2015-09-18 2015-12-09 南通联恒新材料有限公司 Manufacturing process for hard engineering plastic
CN106287022A (en) * 2016-08-25 2017-01-04 焦作恒荣科技有限公司 A kind of rubber tube for turbo charged air pump and manufacture method thereof
CN112519284A (en) * 2020-12-02 2021-03-19 上海华林特种胶管有限公司 Method for manufacturing steel-making converter oxygen lance cooling water rubber pipe
CN112646278A (en) * 2020-12-02 2021-04-13 上海华林特种胶管有限公司 Method for vulcanizing oxygen lance cooling water rubber pipe of steel-making converter
CN112677522A (en) * 2020-12-18 2021-04-20 中国第一汽车股份有限公司 Preparation method of high-temperature-resistant low-pressure-variable cooling rubber pipe

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