CN107511644A - A kind of high intensity, the green intelligence of super abrasive cylinder sleeve make method - Google Patents
A kind of high intensity, the green intelligence of super abrasive cylinder sleeve make method Download PDFInfo
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- CN107511644A CN107511644A CN201710902393.9A CN201710902393A CN107511644A CN 107511644 A CN107511644 A CN 107511644A CN 201710902393 A CN201710902393 A CN 201710902393A CN 107511644 A CN107511644 A CN 107511644A
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- cylinder sleeve
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- internal diameter
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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
Abstract
The invention discloses a kind of high intensity, the green intelligence of super abrasive cylinder sleeve to make method, comprises the following steps：1) blanking：Choose the raw material of two sections of hot rollings or cold drawing steel tube as cylinder sleeve；2) right boring endoporus：Two sections of hot rollings or cold drawing steel tube by selection carry out internal diameter right boring processing；3) friction welding：Two sections of hot rollings or cold drawing steel tube are integrally welded by friction welding apparatus；4) half smart car external diameter：Half finishing processing is carried out to the semi-finished product cylinder sleeve external diameter after processing and end face；5) it is heat-treated；6) the boring top gem of a girdle-pendant is processed：Internal diameter right boring is carried out to the semi-finished product cylinder sleeve after processing；7) milled processed；8) smart car fine grinding external diameter：Smart car is carried out to the semi-finished product cylinder sleeve after processing, refined to finished product.The present invention use material of the steel pipe as cylinder sleeve, and uses Friction welding technique, makes production process simple, solves the deficiency of time-consuming, laborious, casting pollution in traditional cast iron cylinder sleeve production process, waste of material, place waste, production capacity lowly etc..
Description
Technical field
The present invention relates to the part fields such as internal combustion engine, Hydraulic Power Transmission System, standard machinery, more particularly to one kind are high-strength
Degree, the green intelligence of super abrasive cylinder sleeve make method.
Background technology
Current most of engine uses the cylinder jacket of cast iron quality, and it is transported at a high speed by cylinder body to support its intensity to reach
The demand turned.The defects of more be present using the cylinder sleeve of cast iron quality：1st, the production technology of Cast iron liner is excessively traditional, casting and
Heat forming processes extremely power consumption, belongs to high-risk work post, and environmental pollution is serious, and machining processes are cumbersome, and waste of material is extremely serious,
Blank is 5 with net weight ratio：1；2nd, the bulk strength of cast iron quality is weak, and tensile strength is in every square of 220-390MPa unit；3rd, cast
The wearability of iron is undesirable, and frictional resistance is big, and corrosion resistance is bad, and manufacturing cost is high, it is difficult to reaches the use of high-end engine
It is required that.
Number of patent application is 201410394010.8, and patent name is a kind of steel cylinder sleeve process flow, its technical scheme
For：By the low-carbon seamless steel pipe blanking → stretching → chosen cut overall length → flange → corase grind it is cylindrical → corase grind inner circle → turning
Upper and lower seam → flange → rolling → inner hole chrome → superfinishing the top gem of a girdle-pendant of seam → boring endoporus → fine cylindrical → microhoning endoporus → car
Grind endoporus → excircle polishing；Although it is time-consuming to take as material, its production process up to 16 using low-carbon seamless steel pipe
Power, production cost is high, does not have substantial raising with the processing method of traditional cast iron cylinder sleeve；
Number of patent application is 200910233087.6, and patent name is a kind of manufacturing process of steel engine cylinder sleeve, its
It is characterised by：The technological process is：Blanking → car both ends of the surface and inner stopper → boring endoporus → corase grind it is cylindrical → corase grind inner circle → essence
Lower seam → chromium plating → microhoning endoporus → cleaning → inspection → mark outside cylindrical grinding → flange → rolling → right boring endoporus → smart car
Knowledge → spray antirust oil → packaging → storage.Although it using steel material, its production process up to more than ten, is wasted time and energy,
Production cost is high, does not have substantial raising with the processing method of traditional cast iron cylinder sleeve.
Friction welding is that the surface waiting for two thermoplastic articles to be docked is contacted with each other rotation, and makes its phase
Secondary raw frictional heat, composition surface melted by heat, so that becoming a kind of overall welding under stress.Friction welding not only may be used
Welded for plastic products, can be also used for the welding of the different surfaces such as steel-steel, steel-aluminium, copper-aluminium, and these are commonly to weld
It is difficult to accomplish；Quickly, each workpiece only needs several seconds to friction welding speed, and commonly welds the time for needing several times；And
Friction welding does not produce the harmful occupational such as welding fume and manganese, nickel；The intensity of friction welding is also very
Greatly, the intensity sometimes even than material in itself is also big, that is, when external force is firmly pullled, what is be broken first is not weld
Material in itself rather than pad.
Friction welding is a kind of forging welding process, under pressure, rubs, rubs between two tube surfaces
Power produces heat and forms weld seam；Relative motion or friction between two surfaces will continue to carry out, until producing enough heats
Untill；Afterwards, friction is stopped, just forging welding together, forms weld seam to two parts under enough active forces；In most of applied fields
All it is that pipe fitting circumference or cylindric parts are welded, relative motion easily produces friction under conjunction；There are two kinds different to rub
Welding manner is wiped, its difference is the approach difference that energy is passed to the system：There is Continuous Drive mode, or utilize the used of storage
Performance amount ways of carrying out.
Friction welding process includes four-stage：1st, by the nearly welding ring of welding workpiece；2nd, connect welding workpiece and ring type filling
Touch, and make welding ring start to rotate；3rd, axial compressive force is begun to ramp up, so as to elevate the temperature, until reaching forging temperature；4th, weld
Ring is connect to stop the rotation and impose last forging force.Second stage is the dry friction stage, now makes weld assembly initial
Start to contact under low pressure, to clear up end face, make up to preheating degree, and reduce friction system before three phases start
Number.This stage needs continue for some time；Because now coefficient of friction is quite big, therefore quite big power is needed to carry out rotating welding annulus；
Phase III pressure starts to raise, and the friction between weld assembly increases；Welding material becomes fragile and is presented-trickles-state,
Formed-burnt-phenomenon；Material-melt-dirt is disposed from weld interface., when the short tube pre-set reaches
During the position of restriction, the end-of-job in this stage, the stopping that rotation should be as fast as possible；Four-stage is the last stage,
Pressure, which can rise to, to be enough to make weld assembly reach the degree of energy forging welding together.Due to no heat input, the stage can dock
Component carries out additional machining, to promote further becoming more meticulous for microscopic structure.Can be by hydraulic cylinder or pneumatic hammering blow
The mode of pipe end applies forging pressure.This stage once terminates, and welding process just declares to be finished, and can tear welding workpiece immediately open
Unload.
Friction welding is a kind of full automatic welding termination process；Once it is determined that correct welding parameter, skilled worker can manipulate weldering
Machine works；Its advantage can be summarized as follows:1st, it is quick, flexible；2nd, welding process is stable and can review；3rd, welding quality is excellent,
Skilled welder need not be relied on；4th, preparation amount can be preferably minimized；5th, without solder flux or protective gas；6th, to environmental benefits,
Welding flue gas or other gases will not be produced.
The content of the invention
There is provided that a kind of process is simple, cost is low it is an object of the invention to overcome above-mentioned weak point of the prior art
High intensity, the green intelligence of super abrasive cylinder sleeve make method.
The present invention realizes in the following way：
A kind of high intensity, the green intelligence of super abrasive cylinder sleeve make method, it is characterised in that：Comprise the following steps：
1) blanking：It is outer with the external diameter of hypomere in cylinder sleeve and the size of internal diameter, selection according to big of the seam on cylinder sleeve drawing
Footpath is of different sizes, the raw material of the two sections of hot rollings of internal diameter size identical or cold drawing steel tube as cylinder sleeve；
2) right boring endoporus：Two sections of hot rollings that step 1) is chosen or cold drawing steel tube carry out internal diameter right boring processing；
3) friction welding：Two sections of good hot rollings of step 2) right boring or cold drawing steel tube are welded into one by friction welding apparatus
Body, and welding overlap is removed；
4) half smart car external diameter：Semi-finished product cylinder sleeve external diameter and end face after being processed with Internal hole positioning to step 3) carry out half smart car
Processing；
5) it is heat-treated：After semi-finished product cylinder sleeve after step 4) is processed carries out overall normalized treatment, high-frequency quenching equipment is used
High-frequency quenching is carried out to cylinder sleeve internal diameter, then annealed by tunnel annealing furnace, removes internal stress；
6) the boring top gem of a girdle-pendant is processed：Semi-finished product cylinder sleeve progress internal diameter right boring after being processed to step 5), size before right boring to honing, so
Internal diameter honing is carried out afterwards and pulls out qualified platform reticulate pattern；
7) milled processed：Semi-finished product cylinder sleeve internal diameter after being processed to step 6) is ground, and forms inner surface spongy
Oil storage profile；
8) smart car fine grinding external diameter：With Internal hole positioning to step 7) process after semi-finished product cylinder sleeve carry out smart car, fine grinding into
Product.
Further, in the step 5), the normalizing temperature of the normalized treatment is 840 DEG C -860 DEG C.
Further, in the step 5), the hardness of the semi-finished product cylinder sleeve after high-frequency quenching is HRC 50-55, and quenching is hard
Degree layer is 0.5 ± 0.25mm.
The invention has the advantages that：Using material of the steel pipe as cylinder sleeve, and Friction welding technique is used, make production process simple
It is single, solve time-consuming, laborious, casting pollution in traditional cast iron cylinder sleeve production process, waste of material, place waste, production capacity is low
Etc. deficiency, intelligence of the invention make method can realize fully-automatic intelligent produce.
Brief description of the drawings
Fig. 1 cylinder sleeve structural representations of the present invention.
Embodiment
Below by specific embodiment, and with reference to accompanying drawing, technical scheme is described in further detail.Should
Work as understanding, embodiments of the present invention are not limited to the following examples, any formal accommodation done to the present invention
And/or change and fall within the scope of the present invention.
Embodiment：
A kind of high intensity, the green intelligence of super abrasive cylinder sleeve make method, as shown in figure 1, comprising the following steps：
1) blanking：According to the external diameter of hypomere 2 and the size of internal diameter in the seam on cylinder sleeve drawing big 1 and cylinder sleeve, choose
External diameter is of different sizes, the raw material of the two sections of hot rollings of internal diameter size identical or cold drawing steel tube as cylinder sleeve；
2) right boring endoporus：Two sections of hot rollings that step 1) is chosen or cold drawing steel tube carry out internal diameter right boring processing；
3) friction welding：Two sections of good hot rollings of step 2) right boring or cold drawing steel tube are welded into one by friction welding apparatus
Body, and welding overlap is removed；
4) half smart car external diameter：Semi-finished product cylinder sleeve external diameter and end face after being processed with Internal hole positioning to step 3) carry out half smart car
Processing；
5) it is heat-treated：After semi-finished product cylinder sleeve after step 4) is processed carries out overall normalized treatment, high-frequency quenching equipment is used
High-frequency quenching is carried out to cylinder sleeve internal diameter, then annealed by tunnel annealing furnace, removes internal stress；
6) the boring top gem of a girdle-pendant is processed：Semi-finished product cylinder sleeve progress internal diameter right boring after being processed to step 5), size before right boring to honing, so
Internal diameter honing is carried out afterwards and pulls out qualified platform reticulate pattern；
7) milled processed：Semi-finished product cylinder sleeve internal diameter after being processed to step 6) is ground, and forms inner surface spongy
Oil storage profile；
8) smart car fine grinding external diameter：With Internal hole positioning to step 7) process after semi-finished product cylinder sleeve carry out smart car, fine grinding into
Product.
In the present embodiment, in step 5), the normalizing temperature of the normalized treatment is 840 DEG C -860 DEG C.
In the present embodiment, in step 5), the hardness of the semi-finished product cylinder sleeve after high-frequency quenching is HRC50-55, quenching hardness layer
For 0.5 ± 0.25mm.
In the present embodiment, 2) right boring endoporus, 4) half smart car external diameter, 5) heat treatment, 6) processing of the boring top gem of a girdle-pendant, 7) milled processed, 8)
Smart car fine grinding external diameter is conventional machining techniques in cylinder sleeve production, and the application is just without narration in detail；3) Friction welding technique is
Prior art, but it is that the application is created to be used in cylinder sleeve processing, and the parameters of friction welding can be according to steel
Material is debugged by friction welding apparatus, can be accelerated the production procedure of cylinder sleeve by Friction welding technique, and produce
During it is pollution-free.
Conventional cast cylinder sleeve will pass through a system cumbersome process such as sizing, the form removal of mould, and the present invention is using molded
Steel pipe as material, eliminate most of process, and the production process high energy consumption of conventional cast cylinder sleeve, it is big for environment pollution.
The obtained cylinder sleeve of present invention production in the performance of seizure resistance, than traditional cast iron cylinder sleeve performance improve twice with
On；In the performance of corrosion resistance, the performance than traditional cast iron cylinder sleeve is enhanced about more than once the cylinder sleeve that present invention production obtains.
Cylinder sleeve of the present invention and Cast iron liner mechanical performance comparison sheet：
It can be learnt from upper table：The cylinder sleeve that present invention production obtains is in tensile strength, hardness, rigidity layer, modulus of elasticity etc.
Universality can have the raising of conspicuousness relative to traditional cast iron cylinder sleeve in the performance of corresponding aspect.
Cylinder sleeve of the present invention and Cast iron liner overall target comparison sheet：
(by taking WD615 cylinder sleeve production lines as an example, external diameter：130mm；Internal diameter：126m；Length：240mm)
It can be learnt from upper table：Cylinder sleeve produced by the invention in process of production the cost of each side and performance relative to biography
System Cast iron liner is significantly improved in the performance tool of corresponding aspect；The production process of this steel cylinder sleeve is simple, solves tradition
Cast iron liner production in high-risk, power consumption, consumptive material, material inequality, environmental pollution, production capacity lowly etc. deficiency, meet the modern times
The requirement of chemical industry.
Above-described embodiment is only used for the specific implementation principle and effect for illustrating the present invention, rather than for limiting the present invention.Appoint
The personage what is familiar with industry technology can be changed or be modified on the basis of the method that the present invention illustrates, therefore all institutes
Have all that usually intellectual is completed under without departing from disclosed spirit and technological thought in category technical field
Equivalent modification or change, it should be covered by the claim of the present invention.
Claims (3)
1. a kind of high intensity, the green intelligence of super abrasive cylinder sleeve make method, it is characterised in that：Comprise the following steps：
1) blanking：According to the external diameter of hypomere (2) and the size of internal diameter in big of the seam on cylinder sleeve drawing (1) and cylinder sleeve, choose
External diameter is of different sizes, the raw material of the two sections of hot rollings of internal diameter size identical or cold drawing steel tube as cylinder sleeve；
2) right boring endoporus：Two sections of hot rollings that step 1) is chosen or cold drawing steel tube carry out internal diameter right boring processing；
3) friction welding：Two sections of good hot rollings of step 2) right boring or cold drawing steel tube are integrally welded by friction welding apparatus,
And welding overlap is removed；
4) half smart car external diameter：Semi-finished product cylinder sleeve external diameter and end face after being processed with Internal hole positioning to step 3) are carried out half smart car and added
Work；
5) it is heat-treated：After semi-finished product cylinder sleeve after step 4) is processed carries out overall normalized treatment, with high-frequency quenching equipment to cylinder
Cover internal diameter and carry out high-frequency quenching, then annealed by tunnel annealing furnace, remove internal stress；
6) the boring top gem of a girdle-pendant is processed：Semi-finished product cylinder sleeve after being processed to step 5) carries out internal diameter right boring, size before right boring to honing, Ran Houjin
The honing of row internal diameter simultaneously pulls out qualified platform reticulate pattern；
7) milled processed：Semi-finished product cylinder sleeve internal diameter after being processed to step 6) is ground, and inner surface is formed spongy oil storage
Profile；
8) smart car fine grinding external diameter：Semi-finished product cylinder sleeve after being processed with Internal hole positioning to step 7) carries out smart car, refines to finished product.
2. a kind of high intensity according to claim 1, the green intelligence of super abrasive cylinder sleeve make method, it is characterised in that：It is described
In step 5), the normalizing temperature of the normalized treatment is 840 DEG C -860 DEG C.
3. a kind of high intensity according to claim 1, the green intelligence of super abrasive cylinder sleeve make method, it is characterised in that：It is described
In step 5), the hardness of the semi-finished product cylinder sleeve after high-frequency quenching is HRC50-55, and quenching hardness layer is 0.5 ± 0.25mm.
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| CN201710902393.9A CN107511644A (en) | 2017-09-29 | 2017-09-29 | A kind of high intensity, the green intelligence of super abrasive cylinder sleeve make method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109693081A (en) * | 2018-12-27 | 2019-04-30 | 江苏长龄液压股份有限公司 | The processing technology and structure of a kind of Intelligent central swivel joint center rotating shaft |
| CN113199211A (en) * | 2021-04-29 | 2021-08-03 | 青岛征和工业股份有限公司 | Processing technology of sleeve for chain |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58206326A (en) * | 1982-05-27 | 1983-12-01 | Akebono Brake Ind Co Ltd | Piston manufacturing method |
| CN1477321A (en) * | 2003-03-28 | 2004-02-25 | 余宪章 | Cylinder jacket preparation process |
| CN1745238A (en) * | 2003-01-28 | 2006-03-08 | 本田技研工业株式会社 | Cylinder block and cylinder sleeve, method of producing cylinder block and cylinder sleeve by friction stir welding, and friction stir welding method |
| CN101131129A (en) * | 2007-09-14 | 2008-02-27 | 莱阳市永立精工汽车配件有限公司 | Steel cylinder bushing and method for making the same |
| CN102374064A (en) * | 2010-08-08 | 2012-03-14 | 韦加伟 | Steel cylinder sleeve process flow |
| CN104043950A (en) * | 2014-06-23 | 2014-09-17 | 河南伟彤科技股份有限公司 | Machining process of hydraulic support lifting jack cylinder |
| CN106593673A (en) * | 2017-01-17 | 2017-04-26 | 中原内配集团股份有限公司 | Ultramicro modelling cylinder sleeve and preparation method thereof |
| CN107218209A (en) * | 2017-05-04 | 2017-09-29 | 成都金信元机械设备有限公司 | A kind of oil exploitation cylinder sleeve and preparation method thereof |
-
2017
- 2017-09-29 CN CN201710902393.9A patent/CN107511644A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58206326A (en) * | 1982-05-27 | 1983-12-01 | Akebono Brake Ind Co Ltd | Piston manufacturing method |
| CN1745238A (en) * | 2003-01-28 | 2006-03-08 | 本田技研工业株式会社 | Cylinder block and cylinder sleeve, method of producing cylinder block and cylinder sleeve by friction stir welding, and friction stir welding method |
| CN1477321A (en) * | 2003-03-28 | 2004-02-25 | 余宪章 | Cylinder jacket preparation process |
| CN101131129A (en) * | 2007-09-14 | 2008-02-27 | 莱阳市永立精工汽车配件有限公司 | Steel cylinder bushing and method for making the same |
| CN102374064A (en) * | 2010-08-08 | 2012-03-14 | 韦加伟 | Steel cylinder sleeve process flow |
| CN104043950A (en) * | 2014-06-23 | 2014-09-17 | 河南伟彤科技股份有限公司 | Machining process of hydraulic support lifting jack cylinder |
| CN106593673A (en) * | 2017-01-17 | 2017-04-26 | 中原内配集团股份有限公司 | Ultramicro modelling cylinder sleeve and preparation method thereof |
| CN107218209A (en) * | 2017-05-04 | 2017-09-29 | 成都金信元机械设备有限公司 | A kind of oil exploitation cylinder sleeve and preparation method thereof |
Non-Patent Citations (4)
| Title |
|---|
| 中国机械工程学会热处理专业学会《热处理手册》编委会: "《热处理手册》", 30 June 1997, 机械工业出版社 * |
| 张云电: "《薄壁缸套生产技术》", 30 November 2000, 国防工业出版社 * |
| 王北明: "《国外石油钻采钢管加工》", 31 March 1988, 冶金工业出版社 * |
| 贾安东: "《焊接结构及生产设计》", 30 September 1989, 天津大学出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109693081A (en) * | 2018-12-27 | 2019-04-30 | 江苏长龄液压股份有限公司 | The processing technology and structure of a kind of Intelligent central swivel joint center rotating shaft |
| CN113199211A (en) * | 2021-04-29 | 2021-08-03 | 青岛征和工业股份有限公司 | Processing technology of sleeve for chain |
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