CN102758773A - Hydraulic variable pump cylinder block - Google Patents
Hydraulic variable pump cylinder block Download PDFInfo
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- CN102758773A CN102758773A CN2012102208715A CN201210220871A CN102758773A CN 102758773 A CN102758773 A CN 102758773A CN 2012102208715 A CN2012102208715 A CN 2012102208715A CN 201210220871 A CN201210220871 A CN 201210220871A CN 102758773 A CN102758773 A CN 102758773A
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- cylinder block
- pump cylinder
- steel
- hydraulic variable
- cylinder body
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Abstract
The invention discloses a hydraulic variable pump cylinder body. The hydraulic variable pump cylinder block is made of medium-carbon non-quenched and tempered steel. According to the hydraulic variable pump cylinder block, the characteristic that the high-temperature sintering temperature (brazing) of the variable pump cylinder block is just similar to the finish forging temperature after the medium-carbon non-quenched and tempered steel is subjected to hot forging is smartly utilized, therefore, in the conventional process of manufacturing materials into a finished-product cylinder block, the combination property does not drop, but can obtain unexpected promotion, the hardness and the tensile strength are remarkably improved, wherein the hardness of a 48MvV matrix is higher than that of 45 steel by 64.2-68.3 percent, and the tensile strength is higher than that of the 45 steel by 60.3-62.1 percent. Gas nitrocarburizing has influence on the matrix hardness hardly, the surface hardness can be stabilized to be above 650HV0.3, the wear-resisting property of the cylinder block and the efficiency and reliability of an oil pump are remarkably improved, and the oil output pressure under the rotation speed of 3000r/min can reach up to 34.3MPa.
Description
Technical field
The present invention relates to a kind of mechanical part, relate in particular to a kind of oil hydraulic pump parts.
Background technique
The high-pressure and hydraulic variable displacement pump is the important driving power source on the equipment such as engineering machinery.Hydraulic oil through the to-and-fro motion of plunger-plunger ring in the cylinder body cavity, makes hydraulic oil go out oil pressure and raises in many equally distributed cavity of cylinder body of oil hydraulic pump, gets into the oil cylinder of mechanized equipment, converts hydraulic energy to mechanical energy, accomplishes machinery action.On hydraulic variable displacement pump, the machining accuracy of cylinder body, the wear-resisting property of cavity have material impact to the pump efficiency and the reliability of high-pressure and hydraulic variable displacement pump.The plunger that cooperates with cylinder body is modified (283～the 323HBW)+nitriding treatment (850～950HV0.3) of 38CrMoAl; Plunger ring be the GCr15 steel through the processing of hardening (>=63HRC).
Wherein the manufacturing process flow of oil hydraulic pump cylinder body is: blanking-roughing-with the bronze high temperature sintering-fine finishing-gas soft nitriding-finished product of high-wear resistance.
The common used material of hydraulic variable displacement pump cylinder body is 35 steel, 45 steel at present, spheroidal graphite cast iron etc.
Former 45 steel matrix hardness after 1050 ℃ of sintering-slow cooling is extremely low, handles surface hardness max570HV0.3 through nitrocarburizing.Wear-resisting property is poor, under 2000～2500r/min rotating speed, when going out oil pressure near 19.6MPa (200kg/cm
2) time, promptly be prone to take place " scuffing of cylinder bore " phenomenon, produce and leak.
The sintered blank of certain cylinder body and finished product are seen Fig. 1 in the existing technology.
Available technology adopting all be 45 steel cylinder bodies, there are many deficiencys in it.45 steel in the GB/T699-1999 carbon constructional quality steel standard are accomplished sintering process in German MAHLER mesh-belt furnace, after 950 ℃～1050 ℃ casting high-lead bronze sintering-slow cooling with certain trade mark, matrix hardness is extremely low; Microstructure is the ferrite+pearlite near state of equilibrium.Gas nitrocarburizing is subsequently handled, though the matrix hardness of cylinder body is not had obvious influence, only can obtain the max570HV0.3 surface hardness.Behind bronze sintering-slow cooling-nitrocarburizing, hardness is 42～44HRB.
Under 2000～2500r/min rotating speed, relatively poor after the variable displacement pump general assembly because of cylinder body oil pocket surface abrasion resistance property, be prone to " scuffing of cylinder bore " phenomenon takes place, when going out oil pressure near 19.6MPa (200kg/cm
2) time be prone to produce leaks, this is that homemade hydraulic variable displacement pump lags behind international most advanced level, on the pressure not
GoA major reason.
The performance of 45 steel cylinder bodies behind three kinds of temperature sintering-nitrocarburizings sees the following form.Only on very soft matrix, covered the very thin nitride layer of one deck.
Summary of the invention
Technical problem to be solved by this invention is the hydraulic variable displacement pump cylinder body that a kind of new material will be provided, passed through conventional processing technology after, can obtain beyond thought
MechanicsPerformance.
For solving the problems of the technologies described above, technological scheme of the present invention is following:
A kind of hydraulic variable displacement pump cylinder body, carbon non-hardened and tempered steel in the material selection of described hydraulic variable displacement pump cylinder body.
The carbon non-hardened and tempered steel is one of them of 48MnV, 40MnSiVN, 49MnVS and 38MnSiV in described.
Non-modified engineering steel (is called for short: non-hardened and tempered steel), be one type of microalloy structure steel.Under control cold (essence is a kind of " air cooling ") state, forging can obtain the quality adjustment condition mechanical property of (even being superior to) without quenching with Subsequent tempering behind the middle carbon non-hardened and tempered steel hot forging forming wherein.This characteristic of non-hardened and tempered steel is able to successful Application on the structural steel hot forging, like important spare parts such as high-speed diesel fuel machine crankshaft, connecting rods.
Initial forging temperature during wherein middle carbon non-hardened and tempered steel forge hot is generally 1200 ℃～1250 ℃, about 980 ℃～1050 ℃ of final forging temperature, and the control cooling behind the finish-forging is carried out in air dielectric.Control was cooled off after the carbon non-hardened and tempered steel was heated to and is equivalent to final forging temperature in the middle of experimental study showed, can obtain the good mechanical performance equally,
The hydraulic variable displacement pump cylinder body need be through oversintering (soldering) technology, cleverly
UtilizeThe high temperature sintering temperature (soldering) of variable displacement pump cylinder body just in time with the forge hot of middle carbon non-hardened and tempered steel after final forging temperature close; The variation of interior tissue was similar through control air cooling after the final forging temperature with hot forging when the variable displacement pump cylinder body passed through high temperature sintering (soldering) in process of production; The transformation of austenite to (ferrite+pearlite) not only taken place in this process; Also be attended by the precipitation strength and the precipitation strength effect of the distinctive microalloying compound of non-hardened and tempered steel, obtained with the non-hardened and tempered steel forge hot after the control cold identical mechanical property.The sintering cylinder body is again through gas nitrocarburizing, and high-intensity cylinder body becomes the good carrier of nitrocarburizing layer.Performance after the sintering-slow cooling of skilful use non-hardened and tempered steel, workpiece substrate hardness and tensile strength obtain to significantly improve, and wherein the 48MnV matrix hardness exceeds 64.2～68.3% than 45 steel, and tensile strength exceeds 60.3～62.1%.Gas nitrocarburizing is to almost not influence of matrix hardness, and surface hardness really can be stabilized in more than the 650HV0.3, and the wear-resisting property of cylinder body and the efficient of oil pump and reliability significantly improve, and under the 3000r/min rotating speed, go out oil pressure up to 34.3MPa (350kg/cm
2).
Select the material of unique middle carbon non-hardened and tempered steel like this for use as the hydraulic variable displacement pump cylinder body; Not only be adapted to the technological requirement of cylinder body high temperature sintering-nitrocarburizing fully; Make material in the common process that manufactures the finished product cylinder body; Mechanical property does not only fall to obtaining beyond thought lifting on the contrary, makes the high tenacity non-hardened and tempered steel substitute 45 steel fully as the hydraulic variable displacement pump cylinder block material.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technological scheme of the prior art, will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below.
Fig. 1 is the sintered blank schematic representation of certain cylinder body;
Fig. 2 is the finished product schematic representation of certain cylinder body.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technological scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiments.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment who is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
We select the material of 48MnV non-hardened and tempered steel as the variable displacement pump cylinder body for use, and its performance sees the following form behind sintering-nitrogen-carbon cocementing process.
Embodiment's 1,2,3 sintering temperatures adopt 950 ℃, 1000 ℃, 1050 ℃ respectively, and the hardness number of sample adopts 3 values,
Visible by last table, the hardness of non-hardened and tempered steel cylinder body matrix behind sintering-nitrocarburizing is very high, reaches min (minimum) 650HV0.3.Through experiment showed, under the 3000r/min rotating speed, go out oil pressure and bring up to 34.3MPa (350kg/cm
2), the wear-resisting property of cylinder body and the efficient of variable displacement pump significantly improve.
The cylinder body end properties of two kinds of material manufacture relatively sees the following form.
Our material selected for use of the foregoing description is a carbon non-hardened and tempered steel among the 48MnV; Same; We also can select 40MnSiVN, 49MnVS and the 38MnSiV material as the hydraulic variable displacement pump cylinder body for use; Perhaps select other middle carbon non-hardened and tempered steel for use; Because the high temperature sintering temperature (soldering) when the carbon non-hardened and tempered steel was made the hydraulic variable displacement pump cylinder body during we selected for use just in time with the forge hot of middle carbon non-hardened and tempered steel after final forging temperature close, thereby obtain excellent combination property, improve hydraulic cylinder greatly and under the 3000r/min rotating speed, go out oil pressure.Under the situation of variable displacement pump rotating speed raising 20～50%, go out oil pressure and improved 75%.
Claims (2)
1. a hydraulic variable displacement pump cylinder body is characterized in that: carbon non-hardened and tempered steel in the material selection of described hydraulic variable displacement pump cylinder body.
2. hydraulic variable displacement pump cylinder body according to claim 1 is characterized in that: the carbon non-hardened and tempered steel is one of them of 48MnV, 40MnSiVN, 49MnVS and 38MnSiV in described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102208715A CN102758773A (en) | 2012-06-29 | 2012-06-29 | Hydraulic variable pump cylinder block |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102208715A CN102758773A (en) | 2012-06-29 | 2012-06-29 | Hydraulic variable pump cylinder block |
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| CN102758773A true CN102758773A (en) | 2012-10-31 |
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|---|---|---|---|
| CN2012102208715A Pending CN102758773A (en) | 2012-06-29 | 2012-06-29 | Hydraulic variable pump cylinder block |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104712512A (en) * | 2013-12-16 | 2015-06-17 | 罗伯特·博世有限公司 | Cylinder Drum of Hydrostatic Axial Piston Machine having Wear-Resistant Layer |
| CN104711509A (en) * | 2013-12-16 | 2015-06-17 | 罗伯特·博世有限公司 | Method for Gas Carbonitriding |
| CN106862858A (en) * | 2015-11-13 | 2017-06-20 | 罗伯特·博世有限公司 | The axial piston machine of the hydrostatic of the method, the drive shaft in tool space and tool drive shaft in manufacture drive shaft ball cap shape space |
-
2012
- 2012-06-29 CN CN2012102208715A patent/CN102758773A/en active Pending
Non-Patent Citations (2)
| Title |
|---|
| 张朝生，张志勤: "日本节能型非调质钢材的开发", 《钢铁》 * |
| 谢维立，陈德华，王志明: "中碳微合金非调质钢的正火性能及应用", 《热处理技术与装备》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104712512A (en) * | 2013-12-16 | 2015-06-17 | 罗伯特·博世有限公司 | Cylinder Drum of Hydrostatic Axial Piston Machine having Wear-Resistant Layer |
| CN104711509A (en) * | 2013-12-16 | 2015-06-17 | 罗伯特·博世有限公司 | Method for Gas Carbonitriding |
| US20150167653A1 (en) * | 2013-12-16 | 2015-06-18 | Robert Bosch Gmbh | Cylinder Drum of a Hydrostatic Axial Piston Machine having a Wear-Resistant Layer |
| US10281042B2 (en) | 2013-12-16 | 2019-05-07 | Robert Bosch Gmbh | Cylinder drum of a hydrostatic axial piston machine having a wear-resistant layer |
| CN104711509B (en) * | 2013-12-16 | 2019-08-06 | 罗伯特·博世有限公司 | Method for carrying out gas phase nitrocarburizing processing |
| CN104712512B (en) * | 2013-12-16 | 2020-05-15 | 罗伯特·博世有限公司 | Cylinder for a hydrostatic axial piston machine with a wear protection layer |
| CN106862858A (en) * | 2015-11-13 | 2017-06-20 | 罗伯特·博世有限公司 | The axial piston machine of the hydrostatic of the method, the drive shaft in tool space and tool drive shaft in manufacture drive shaft ball cap shape space |
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Application publication date: 20121031 |