CN208040807U - A kind of bimetal structure piston rod - Google Patents
A kind of bimetal structure piston rod Download PDFInfo
- Publication number
- CN208040807U CN208040807U CN201721507791.2U CN201721507791U CN208040807U CN 208040807 U CN208040807 U CN 208040807U CN 201721507791 U CN201721507791 U CN 201721507791U CN 208040807 U CN208040807 U CN 208040807U
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- CN
- China
- Prior art keywords
- piston rod
- mandrel
- casing
- ceramic layer
- differential arc
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- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The utility model is related to a kind of bimetal structure piston rod, piston rod includes steel mandrel, aluminium alloy casing and ceramic layer；Ceramic layer is generated using differential arc oxidization technique, the hardness of piston rod and wearability is made to improve, piston rod failure probability caused by the corrosion and abrasion of its outer surface is reduced, increases its service life；Electrolyte used in process is more environmentally friendly；The ceramic layer and matrix associativity that differential arc oxidation generates are strong, and porosity is controlled, and good insulating, thermal conductivity is strong, have good electromagnetic shielding capability, play a good protective effect to the sensor inside the body of rod；Double-layer metal structure makes inside and outside separated, and the fatigue stress that outer friction generates will not pass to the bearing position of internal piston bar, avoid making piston rod inner the case where slight crack occur due to outer surface fatigue stress；It after external aluminium layer fails, can be removed, be set with aluminium layer again on the basis of mandrel, carried out differential arc oxidation processing, internal piston bar is made to recycle.
Description
Technical field
The utility model belongs to hydraulic cylinder transmission field of engineering technology, and in particular to a kind of bimetal structure piston rod.
Background technology
Hydraulic drive have the characteristics that it is simple in structure, operate steadily, especially answered in mine equipment field in engineering machinery
With extensive.Mainly to be hydraulic cylinder as carrier, hydraulic cylinder includes the components group such as piston rod, cylinder body, guide sleeve, piston for hydraulic drive
At the cooperation precision of wherein piston rod and guide sleeve decides hydraulic cylinder transmission accuracy.Since the working environment of engineering machinery is multiple
Miscellaneous, the solid particulate matters such as iron filings, dust are usually adhered to piston rod surface, and piston rod surface is caused to scratch and be worn, when long
Between exposed also make its easy-to-rust etc. in air.The abrasion and corrosion of piston rod surface be hydraulic cylinder failure the main reason for it
One.
Metal material is mainly medium carbon steel or medium carbon alloy steel used by piston rod manufacture.To improve case hardness and resistance to
Mill property, at present piston rod surface generally use chromium plating process technique.But chrome-plated process operating process is complicated, and energy consumption is very high, especially
It is that environmental pollution is very serious.Also, chrome layer has certain porosity, limits the raising of surface corrosion resistance.It finds
Novel piston rod structure and process of surface treatment are the important topics of piston rod manufacture.
Differential arc oxidization technique is on the basis of common anode aoxidizes, and operating voltage is from common anodic oxidation Faraday
Area enters micro-arc discharge area, and material generates ceramics under plasma chemical, heat chemistry and electrochemistry collective effect, in material in situ
The process for treating surface of layer.The ceramic film even compact of technology manufacture, it is strong with body binding force, greatly improve material
Wear-resisting, corrosion resisting property, and process stabilizing is simple, electrolyte is environment friendly and pollution-free.Differential arc oxidization technique is mainly used for coloured at present
Metal can significantly improve its microhardness and wearability.But non-ferrous metal its poor toughness and it is of high cost due to,
Hydraulic cylinder technical field is using less.The main thought of the utility model is that non-ferrous metal that differential arc oxidation is handled and 45 steel exist
It realizes and combines on piston rod, can realize the novel piston rod processing technology for integrating hardness, wearability and toughness.It is so far
Only, there is not yet the patent of this aspect and research paper report, also emerge without relevant product.
Utility model content
The purpose of this utility model is to use differential arc oxidization technique, provides a kind of bimetal structure piston rod, it can be incited somebody to action
The intensity and toughness combination of the requirement of the process of surface treatment and piston rod of high rigidity, the performance to meet piston rod are wanted
It asks, solves the problems, such as existing piston rod surface wearability and corrosion resistance.
The utility model is achieved through the following technical solutions：A kind of bimetal structure piston rod, including mandrel, casing
And ceramic layer；The mandrel uses medium carbon steel or medium carbon alloy steel material, casing to use aluminum alloy material；Described sleeve pipe and mandrel
Mandrel suit is fixed in casing by interference fit using hot charge practice, and the both ends of the mandrel extend out to the outside of casing, casing
Both ends be welded and fixed with mandrel；The outer surface of described sleeve pipe forms ceramic layer by micro-arc oxidation process.
The aluminum alloy sleeve tube thickness is 2~8mm.
With H8/s7 is combined between aluminum alloy sleeve pipe orifice face and mandrel periphery, two cooperation surface roughness are less than
Ra6.3μm。
The ceramic layer thickness of generation of the aluminium alloy casing periphery by differential arc oxidation processing is 150 μm, micro- hard
Degree reaches 1500HV.
A kind of processing method of bimetal structure piston rod, tool stop step and are：
The processing of step 1) piston rod mandrel：To bar shot-peening, rough turn, smart car, make mandrel meet fit dimension precision and
The requirement of surface accuracy；
The processing of step 2) piston rod bush：Rough turn, right boring is carried out to aluminium alloy pipe, meets the dimensional accuracy of its endoporus
And surface roughness requirements；It is interference fit between aluminium alloy casing and mandrel, was determined according to the bar of piston rod length and diameter
The amount of being full of；
Step 3) hot charging and room temperature cooling：Aluminium alloy casing is heated, its radial dimension is made to increase；Using hot press
Piston rod mandrel is fitted into the aluminium alloy casing after heating；Room temperature cooling is carried out after the completion of assembly；
Step 4) is welded：The both side ends region of aluminium alloy casing and piston rod mandrel is welded；Using argon arc welding
Welding procedure, packing material selects the super-purified aluminium welding wire containing a small amount of silicon, in order to avoid the formation of intermediate frangible compounds, when welding
It is pre-coated with zinc, tin or silver metal transition zone in steel surface；
Step 5) piston rod outer surface machines：Rough turn, the finishing processing of outer surface are carried out to welded piston rod,
It is set to meet the requirement of piston rod size and roughness requirements；
The processing of step 6) piston rod surface differential arc oxidation：The piston rod of machine-shaping is put into micro-arc oxidation electrolyte,
Differential arc oxidation processing is carried out, ceramic layer is generated, improves the wearability and corrosion resistance of piston rod surface.
Further, aluminium alloy casing is heated using oil heat or induction type heating.
Further, in advance using the infusion process coating zinc of 0.2mm thickness, tin or silver-colored transition zone, to avoid aluminium alloy with
The generation of intermetallic compound in the different-metal material welding of steel, to obtain the high welding point of intensity.
Further, differential arc oxidation running parameter is set as operating voltage 500V, oxidization time 30min, ultimately forms good
Good ceramic layer.
Further, additive Na is added in the electrolyte2MnO4、Na2WO4、Na2SnO3、NaH2PO4In one kind or
Arbitrary several combination.
Using whole mach thinking is welded after two component elder generation separate machineds in technical solution, finally to piston rod outside
Layer carries out differential arc oxidation processing.Piston rod mandrel is machined out first, is mainly completed on lathe, reaches and is closed with aluminium
The fit dimension of golden casing assembly requires and roughness requirements；The processing of aluminium alloy casing is mainly used rough turn and right boring
Processing method meets size and the required precision of endoporus.Hot assembly and welding after the completion of parts machining, into overall processing stream
Journey, being processed on lathe makes its periphery meet size and required precision, and to improve precision, it is thick that aluminium layer actual (real) thickness is more than setting
Degree, reaches the thickness and piston rod outer diameter of requirement by turning in this work step.It is whole after the completion of mechanical process to be put into oxygen
Change and carries out differential arc oxidation generation dense ceramic layers in pond.
The utility model has the following advantages:1) it is handled by the differential arc oxidation of outer layer aluminum or aluminum alloy and makes piston rod
Hardness and wearability significantly improve, and microhardness can reach 1000-2000HV, are existing chromium plating process piston rod surface hardness
2 to 3 times.To reduce piston rod failure probability caused by the corrosion and abrasion due to piston rod outer surface, increase piston rod
Service life；2) differential arc oxidization technique is used to handle piston rod, the electrolyte used in process is more environmentally friendly.And present work
Stopper rod mostly uses chromium plating process for outer surface, and electroplating technology environmental pollution is serious, and differential arc oxidization technique just solves now
The technical issues of having；3) strong by the ceramic layer and matrix associativity of differential arc oxidation generation, porosity can be very good to control, and compare
It is finer and close in chrome layer, and ceramic layer good insulating, thermal conductivity is strong, has good electromagnetic shielding capability, can be to being mounted on
The sensor of piston rod inner plays a good protective effect；4) piston rod construction of double-layer metal structure makes inside and outside point
It opens, the fatigue stress that external friction generates will not pass to the bearing position of internal piston bar, avoid due to outer surface fatigue
Stress and so that piston rod inner the case where slight crack is occurred；5) it after external aluminium layer fails, can be removed, in internal piston rod
On the basis of be set with aluminium layer again, carry out differential arc oxidation processing, internal piston bar can be made to recycle, reduce the waste of material,
Save production cost.
Description of the drawings
Attached drawing 1 is the structural schematic diagram of the utility model.
In figure, 1. mandrels, 2. casings, 3. ceramic layers.
Specific implementation mode
The utility model is described in further detail with reference to the accompanying drawings and detailed description.
Embodiment one：Fig. 1 is a kind of structural schematic diagram of bimetal structure piston rod of the utility model.The present embodiment is selected
The long 500mm of piston rod bar, the body of rod of diameter 100mm, it is 3mm (such as 1 institute of table to set aluminum layer thickness according to bar length and diameter condition
Show).It has piston rod mandrel 1 and 2 two parts of aluminium alloy casing to be assembled as shown in Figure 1, and 1 material of piston rod mandrel is 45 steel
Modifier treatment, aluminium alloy casing 2 are duralumin, trade mark 2A12.Between 1 periphery of 2 inner hole surface of aluminium alloy casing and piston rod mandrel
With H8/s7 is combined into, two mating surfaces make roughness be less than Ra6.3 μm by smart car.2 periphery of aluminium alloy casing passes through differential of the arc oxygen
3 thickness of ceramic layer for changing the generation of processing is 150 μm, and microhardness reaches 1500HV.
Table 1 often uses aluminum layer thickness recommendation
Referring to attached drawing, the example process is as follows：
1) bar after 45 steel of preparation are quenched and 2A12 pipe tubing, prepare shot blasting equipment, lathe, welding equipment, induction type
The equipment such as heating furnace, differential arc oxidation processing pond.
2) shot-peening is carried out to 45 steel bars, removes surface oxide layer, rough turn on lathe, smart car is simultaneously processed screw thread, is made
Piston rod mandrel 1.
3) the rough turn and smart car of surfaces externally and internally is carried out to 2A12 tubing, tubing thickness is 4.5mm, is made by tentatively machining
It obtains internal surface of pipe and meets size requirement and roughness requirements, and thickness is made to be kept to 4mm, aluminium alloy casing 2 is made.
4) induction type heating is carried out to aluminium alloy casing 2, according to interference volume calculating and setting heating temperature.Complete heating temperature
Hot assembly is carried out to piston rod mandrel 1 and aluminium alloy casing 2 afterwards, room temperature cooling is carried out after the completion of assembly.
5) assembly cooled down is welded, the super-purified aluminium welding wire containing a small amount of silicon is used by argon arc welding, is being welded in advance
It meets place and smears zinc powder, to facilitate welding and form good weld seam, the generation of weld metal zone brittle intermetallic thing is avoided, to influence to weld
Performance.
6) bimetal piston bar is machined, main externally disc carries out smart car, removes the office generated because assembling and welding
Portion deforms, and it is made to meet size requirement, and 2 thickness of aluminium alloy casing should reach 3mm at this time.
7) piston rod is put into the electrolyte in differential arc oxidation pond, in order to increase the wearability of ceramic layer 3, in electrolyte
Middle addition Na2MnO4And Na2WO4、Na2SnO3、NaH2PO4The wearability of film layer can be increased, and reduce porosity.Selection is suitable
Voltage and discharge time form good ceramic layer 3.
It is to be noted that only listing a kind of the solid of the external aluminium layer of both ends double thread formula in above example and attached drawing
The situation of piston rod, but the utility model is equally applicable to the piston rod or hollow piston rod of other types of attachment, other metals
Combination or welding procedure.It is also new all without departing from this practicality in any deformation that specific embodiment of the present utility model is made
The range that the spirit and claim of type are recorded.
Claims (4)
1. a kind of bimetal structure piston rod, which is characterized in that including mandrel, casing and ceramic layer；Carbon during the mandrel uses
Steel or medium carbon alloy steel material, casing use aluminum alloy material；Described sleeve pipe and mandrel are interference fitted, using hot charge practice by mandrel
Suit is fixed in casing, and the both ends of the mandrel extend out to the outside of casing, and both ends and the mandrel of casing are welded and fixed；It is described
The outer surface of casing forms ceramic layer by micro-arc oxidation process.
2. a kind of bimetal structure piston rod according to claim 1, which is characterized in that the aluminum alloy sleeve tube thickness is
2~8mm.
3. a kind of bimetal structure piston rod according to claim 1, which is characterized in that aluminum alloy sleeve pipe orifice face
With H8/s7 is combined between mandrel periphery, two cooperation surface roughness are less than Ra6.3 μm.
4. a kind of bimetal structure piston rod according to claim 1, which is characterized in that the aluminium alloy casing periphery
The ceramic layer thickness of the generation handled by differential arc oxidation is 150 μm, and microhardness reaches 1500HV.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721507791.2U CN208040807U (en) | 2017-11-14 | 2017-11-14 | A kind of bimetal structure piston rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721507791.2U CN208040807U (en) | 2017-11-14 | 2017-11-14 | A kind of bimetal structure piston rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208040807U true CN208040807U (en) | 2018-11-02 |
Family
ID=63957916
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721507791.2U Expired - Fee Related CN208040807U (en) | 2017-11-14 | 2017-11-14 | A kind of bimetal structure piston rod |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208040807U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108266425A (en) * | 2017-11-14 | 2018-07-10 | 徐州永佳液压设备有限公司 | A kind of bimetal structure piston rod and its processing method |
-
2017
- 2017-11-14 CN CN201721507791.2U patent/CN208040807U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108266425A (en) * | 2017-11-14 | 2018-07-10 | 徐州永佳液压设备有限公司 | A kind of bimetal structure piston rod and its processing method |
| CN108266425B (en) * | 2017-11-14 | 2024-01-09 | 徐州永佳液压设备有限公司 | Double-metal-structure piston rod and processing method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181102 Termination date: 20191114 |