另外還存在材料金相組織穩(wěn)定的問(wèn)題,眾所周知,鋼在淬火后總是會(huì)有殘余的奧氏體,該體長(zhǎng)時(shí)間會(huì)轉(zhuǎn)變成密度小的馬氏體。這樣一來(lái),會(huì)使零件尺寸變形,減少間隙。這個(gè)因素基本是估計(jì)不到的。所以,從這個(gè)觀點(diǎn)來(lái)看,柱塞采用刃量具鋼為好,或者說(shuō)采用時(shí)效或者冷處理,來(lái)穩(wěn)定金相組織。這個(gè)問(wèn)題在間隙小時(shí)就顯得尤為重要了。
大家知道,銅現(xiàn)在已成為一種貧缺材料資源,在機(jī)械設(shè)計(jì)中少用或不用銅材已經(jīng)是一個(gè)基本用料原則之一。在配油機(jī)構(gòu)中少用或不用銅的材料偶中,是以鑄鐵或CuFe粉末冶金材料來(lái)代替,另外還有在配油盤(pán)表面需涂貼一層耐磨塑料作為軟質(zhì)材料。在小功率液壓泵中,還出現(xiàn)用石墨作為軟質(zhì)材料制作配油盤(pán)。實(shí)驗(yàn)結(jié)果指出,在配油機(jī)構(gòu)的軟對(duì)硬材料偶中,硬質(zhì)材料的磨損反而要比軟質(zhì)材料快2~3倍。所以,為了使硬質(zhì)材料具有高的耐磨性能和抗咬合能力,都會(huì)進(jìn)行熱處理至高硬度HRC>60,或采用氮化鋼,如38CrMoAl鋼,經(jīng)過(guò)氮化處理。為了保持鋼制配油盤(pán)的平面在使用過(guò)程不發(fā)生瓢曲、變形,熱處理后還須經(jīng)過(guò)冷處理和時(shí)效處理,以穩(wěn)定起金相組織,消除多余應(yīng)力。對(duì)于青銅制的缸體配油表面,有時(shí)為了改善其跑合性,或者選擇鍍很薄一層耐磨性腐蝕材料,如底層鍍鉛,上層鍍銦,或只鍍一層鉛等方式。
德國(guó)力士樂(lè)柱塞泵型號(hào):
A10VSO45DFR/31R-PPA12K68
A4VSO180DR/30R-PPB12NOOS1057
A4VS0500HSK/30R-PPH13N0010SET
A4VG125HDMT1-32R-NSF02F691S-S
A4VG125HD1D2/32R-NSF001S
A4VS0250DRG/30R-PPB13N00
A4VSG250HW/30R-PPB10N000N
A4VG56EZ1DMV32R-PSC02F023E-S
AA10VSO100DFR/31L-PKC62K03
A4VG125HD1D2/32R-NSF001S
A4VSG250EO1/30R-PPB10H009F
A10VSO140DFLR/31R-PPB12N00
A4VSG71EM3120/10R-PPB10K019N
A4VG71DWDMT2/23L-NZF02F041D泵
AA10VSO100DFR/31L-PKC62K03
A4VSG71EO1/10R-PPB10H029F
A4VG-125
A4VSO250DFR/30R-PPB13N00
A4VSO250DFR/30R-PPB13N00
A2VK28MAOR1GOPE2-S022028554
A4VSO180EO/30L-P2B13N00
A4VS0125DR/22R-PPB13N00
A4VSG71EO2K/10R-PPB10H049N
E-A4VSO180DR/30R-PPB13N00
A4VG90HWDL1/32R-NAF02F071L-S+A
A4VS0250DRG/30R-PPB13N00E-
A4VG250HD1D1/32LNZD10F001S
軸向柱塞泵E-A4VSO250EO2/30R-VPB25N00-SO3
A4VS07IDR/3XR軸向柱塞泵
E-A10VSO45DR/31R-PPA12N00
A4VSG40HD1D/10R-PZB10N000N
A4VSO180DR/3XR-PPB13N00
AA10VSO140DRG/31R-PKD62N00
A10VSO28DFLR/31R-PPA12NOO
液壓馬達(dá)
A4VS071DR/30R-PPB13N00
A10VSO45DFR1/31R-PPA12N00
A4VSG40EM2009/10R-PZB10N000N
A4VG90HWD2/32R-PZF02F001S
A4VS0250DR/30R-PPB13N00
A4FM71/10W-PPB01
A4VSO71DR/10R-PPB13N00
A4VG250HD1D1/32LNZD10F001S
A4VSG71EO2K/10R-PPB10H049N
A4VSG40EM4095/10R-PPB10H039F
A4VG125HD1P1/32R-N2D10F69
A4VS0500HSK/30R-PPH13N0010SETE-
A4VG71DWDMT2/23L-NZF02F041D泵
A4VSG40HS1/10R-VPB10N000N
A4VG125HD1D2/32R-NSF02F02F021P
A4VG250HD1D1/32R-NSD10F001D
柱塞泵A4VSO180DR/30R-FPB13N00
A4VSO125DR/30R-PPB13N00
A4VSG40EM4095/10R-PPB10H039F
A4VG125HD1D2/32R-NSF02F02F021P
A4VG56EZ1DMV32R-PSC02F023E-S
A4VG56EZ1DMV32R-PSC02F023E-S
柱塞泵A4VSG750HD/22R-PPH10NOO
A10VS071DR/31R-PPA12N00
A4VSO40DR/10R-PPB13N00
A10VSO100DFLR/31R-PPA12K26
E-A4VSO180DR/30R-PPB13N00
A4VS0250LR3G/30R-PZB13K35-S0
A4VSG250HS1/30L-PPB10N000N
A4VG125HDMT1/32R-NSFO21S-S
A4VG40EP4DMT1/32L-NSC02F015PH
齒輪泵是一種容積式泵,其結(jié)構(gòu)輕便緊湊,制造簡(jiǎn)單,工作可靠,維護(hù)保養(yǎng)方便。一般具有輸送流量小輸送壓力高的特點(diǎn),且用于輸送黏性較大的液體。但工藝要求高,不易獲得精準(zhǔn)的匹配。隨著齒輪泵在結(jié)構(gòu)上的不斷完善,它也被用于中壓、高壓液壓系統(tǒng)中,因此研究齒輪泵對(duì)農(nóng)業(yè)和工業(yè)均有重要的意義。
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