• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A method is described for producing a water hydraulic machine having a first member (1) and a second member (2) in sliding contact with a contact surface (3) of the first member (1), wherein the second member (2) comprises a surface made of a friction reducing plastic material and the contact surface (3) is a metallic surface. The machine must have a low risk of damage. To this end, the method comprises the stages of: - using a first member (1) comprising a first part (4) having the contact surface (3) and a second part (5), - use a high temperature hardening process at a temperature of at least 1000ºC to give a deep surface hardening of the contact surface (3) of the first part (4) - machine the first part (4) to the desired geometry - Assembling the first piece (4) and the second piece (5) to form the first member. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2820199A1
    申请号:ES202030837
    申请日:2020-08-05
    公开日:2021-04-19
    发明作者:Georg Enevoldsen；Stig Kildegaard Andersen；Frank Holm Iversen
    申请人:Danfoss AS；
    IPC主号:
    专利说明:

    [0001] Method to produce a water hydraulic machine
    [0002] The present invention relates to a method for producing a water hydraulic machine having a first member and a second member in sliding contact with a contact surface of the first member, wherein the second member comprises a surface made of a reducing plastic material. friction and the contact surface is a metallic surface.
    [0003] A hydraulic water machine uses water as the hydraulic fluid. Water has the advantage that it is respectful with the environment. Water, however, has the disadvantage that it does not lubricate surfaces that slide relative to each other. Therefore, it is known to use a friction reducing plastic material on one of the contact surfaces. This type of friction reducing plastic material can be, for example, polyetheretherketone (PEEK). However, when this type of plastic surface is exposed to particles above a certain critical side, typically sand or silica, large pieces of the metal surface are dislodged which are then partially embedded in the plastic material. The protruding part of the partially embedded metal pieces then begins to wear and scratch against the metal contact surface. This can lead to increased internal leakage rates and reduced volumetric efficiency, increased wear on the metal contact surface which reduces service life, and increased friction leading to reduced mechanical efficiencies. The object underlying the invention is to produce a machine that has a low risk of damage. This object is solved with a method as described at the beginning in which the method comprises the steps of
    [0004] - using a first member comprising a first piece having the contact surface and a second piece,
    [0005] - use a high temperature hardening process at a temperature of at least 1000 ° C to give a deep surface hardening of the contact surface of the first part,
    [0006] - machine the first part to the desired geometry,
    [0007] - assembling the first piece and the second piece to form the first member.
    [0008] The use of a high temperature hardening process provides a relatively hard contact surface to withstand damage caused by particles that have a certain critical size. However, the use of a high temperature hardening process has the disadvantage that the hardened part is distorted, which is detrimental to any hydraulic machine. This drawback is overcome by machining the first part to the desired geometry and assembling the first part and the second part to form the first member. The first member then has a contact surface of considerable hardness and the desired geometry.
    [0009] In one embodiment of the invention the high temperature curing process is carried out in the presence of nitrogen. This offers the possibility for nitrogen to diffuse to the contact surface to a depth of 1 to 2 mm and the surface to have a hardness of up to 400 HV (Vickers hardness). Machining reduces the thickness of the hardened layer. Without However, the remainder of the first member is still hard to withstand damage caused by sand or silica particles to a high degree.
    [0010] In one embodiment of the invention a low temperature hardening process is used at a temperature of 550 C or less to give a super hard final contact surface of the first part. If, due to machining the first part, the contact surface has lost the desired hardness or the desired hardness is reduced below a predetermined threshold value, the low temperature hardening process can be used to give a super hard final surface, for example, 1000 HV or more and a surface layer of about 100 pm. This is sufficient for a hydraulic water machine.
    [0011] In one embodiment of the invention the contact surface is polished. A polish is used to achieve the required flatness tolerances.
    [0012] In one embodiment of the invention the first piece is chosen to have a thickness less than the second piece. The smaller the thickness, the lower the risk of distortion of the second piece.
    [0013] In one embodiment of the invention, the thickness of the first piece is equal to or less than 10 mm. This thickness is enough to form the first piece. However, the risk of distortion can be managed.
    [0014] In one embodiment of the invention the first piece is chosen to be symmetrical with respect to an axis located on the contact surface. When the first part is a symmetrical part, the distortion can be kept small.
    [0015] In one embodiment of the invention the first piece is chosen to be symmetrical with respect to a second axis located on the contact surface and which is orthogonal to a first axis. Again, symmetry reduces distortion.
    [0016] In one embodiment of the invention the first piece is chosen to be made of stainless steel.
    [0017] When using water as the hydraulic fluid, stainless steel is preferred.
    [0018] In one embodiment of the invention the first part is chosen to be Duplex steel or Super Duplex steel or 316 steel. Even 316 steel can be used because it is hardened by the method.
    [0019] The invention will now be described in more detail with reference to the drawings, which show: Single Fig .: A schematic flow diagram of the method.
    [0020] Fig. Schematically shows members of a hydraulic water machine, more precisely a first member 1 in the form of a wobble plate and a second member 2 in the form of a sliding shoe. The invention, however, can be used in connection with another pairing of elements, for example cylinder drum and valve plate. The first member comprises a metallic contact surface 3. The second member 2 is in sliding contact with the contact surface 3. In order to be able to use water as hydraulic fluid, the second member 2 is provided with a coating of a friction reducing plastic material, for example polyetheretherketone (PEEK) at least on the side facing the contact surface 3.
    [0021] In order to keep the risk of damage to the contact surface 3 low, it is desired to make the contact surface 3 as hard as possible.
    [0022] To this end, the first member 1 is designed to have two pieces, that is a first piece 4 having the contact surface 3 and a second piece 5.
    [0023] The first piece 4 is symmetrical at least with respect to a first axis of symmetry located on the contact surface. However, it is preferred that the first piece 4 is symmetrical with respect to a second axis of symmetry located on the contact surface as well and that is orthogonal to the first axis of symmetry.
    [0024] Additionally, the first piece 4 is chosen to have a thickness less than the second piece 5. The thickness of the first piece 4 is equal to or less than 10 mm.
    [0025] Only the first part 4 is subjected to a hardening process at a temperature of at least 1000 ° C and preferably in the presence of nitrogen. This type of curing process is described in more detail in European patent EP 2 841 617 B1. This process is abbreviated as "high temperature hardening process" 6.
    [0026] During this high temperature hardening process 6 the first part 4 is distorted. However, the distortion is small due to symmetry.
    [0027] In a machining step 7 the first part 4 is machined to the desired geometry. This means that some of the hardened surface layer is removed from the first part 4.
    [0028] In a subsequent low temperature hardening process 8 the first part 4 is provided with a super hard surface layer. The low temperature hardening is carried out at a temperature in the range of 450 ° C to 550 ° C. The super hard surface layer is approximately 100 µm thick and has a hardness of 1000 HV (Vickers hardness) or more.
    [0029] The low temperature hardening process 8 again leads to a distortion of the first part 4. However, this distortion is less than the distortion caused by the high temperature hardening process 6.
    [0030] After the low temperature hardening process 8 the part 4 is polished in a polishing stage 9. In the polishing stage 9 the part 4 is polished to required flatness tolerances. Due to smaller distortions, polishing is sufficient to achieve the desired geometry.
    [0031] After the polishing stage 9 the first part 4 and the second part 5 are assembled, for example, by means of screws or glue. Other assembly techniques can be used. What's more, in some cases it is not necessary to connect the two pieces, e.g. For example, when a pressure or a force produced by spring means acting on one of the two pieces is sufficient to hold the two pieces together. In this case it might be necessary to use something to align the two pieces.
    [0032] A final product is achieved, that is, the first member 1, which has an exact geometry and a high surface hardness with a thickness of the hardened surface of about 50 pm.
    权利要求:
    Claims (10)
    [1]
    1. Method for producing a water hydraulic machine having a first member (1) and a second member (2) in sliding contact with a contact surface (3) of the first member (1), wherein the second member (2 ) comprises a surface made of a friction-reducing plastic material and the contact surface (3) is a metallic surface, characterized in that the method comprises the steps of:
    - using a first member (1) comprising a first part (4) having the contact surface (3) and a second part (5),
    - use a high temperature hardening process at a temperature of at least 1000 ° C to give a deep surface hardening of the contact surface (3) of the first part (4)
    - machine the first part (4) to the desired geometry
    - Assembling the first piece (4) and the second piece (5) to form the first member.
    [2]
    2. Method according to claim 1, characterized in that the high temperature hardening process is carried out in the presence of nitrogen.
    [3]
    Method according to claim 1 or 2, characterized in that a low temperature hardening process is used at a temperature of 550 ° C or less to give a super hard final contact surface (3) of the first part (4).
    [4]
    Method according to any one of claims 1 to 3, characterized in that at least the contact surface (3) is polished.
    [5]
    Method according to any one of claims 1 to 4, characterized in that the first piece (4) is chosen to have a lower thickness than the second piece (5).
    [6]
    6. Method according to claim 5, characterized in that the thickness of the first piece (4) is equal to or less than 10 mm.
    [7]
    7. Method according to any of claims 1 to 6, characterized in that the first piece (4) is chosen to be symmetrical with respect to an axis located on the contact surface (3).
    [8]
    Method according to claim 7, characterized in that the first piece is chosen to be symmetrical with respect to a second axis located on the contact surface (3) and that is orthogonal to the first axis.
    [9]
    9. Method according to any of claims 1 to 8, characterized in that the first piece (4) is chosen to be made of stainless steel.
    [10]
    10. Method according to claim 9, characterized in that the first part (4) is chosen to be Duplex steel or Super Duplex steel or 316 steel.
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    同族专利:
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    CN112553568A|2021-03-26|
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US5961218A|1996-02-20|1999-10-05|Ebara Corporation|Water lubricated machine component having contacting sliding surfaces|
    EP0852294A2|1997-01-07|1998-07-08|Zexel Corporation|Variable capacity swash plate compressor and method of surface treatment of a swash plate thereof|
    EP1262661A1|2001-05-21|2002-12-04|Kabushiki Kaisha Toyota Jidoshokki|Shoe for swash plate type compressor and method of producing the same|
    US20140050932A1|2011-03-29|2014-02-20|Schaeffler Technologies AG & Co. KG|Method for producing a hardened, coated metal component|
    DE4033706C2|1990-10-24|1991-07-11|Hans Prof. Dr.-Ing. 4630 Bochum De Berns|
    DE4333917C2|1993-10-05|1994-06-23|Hans Prof Dr Ing Berns|Edge embroidery to create a high-strength austenitic surface layer in stainless steels|
    DE19510302C2|1995-03-22|1997-04-24|Bilstein August Gmbh Co Kg|Surface-treated piston rod and process for its manufacture|
    DE102004039926B4|2004-08-18|2016-09-22|Robert Bosch Gmbh|Process for producing a temperature and corrosion resistant fuel injector body|
    EP2841617B1|2012-04-27|2017-12-13|Expanite Technology A/S|Method for solution hardening of a cold deformed workpiece of a passive alloy, and a member solution hardened by the method|
    DE112016003760T5|2015-08-17|2018-05-03|Ntn Corporation|Sliding element and method for its production|
    AT519398B1|2016-12-06|2019-05-15|Miba Sinter Austria Gmbh|Method for producing a swash plate|
    法律状态:
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    优先权:
    申请号 | 申请日 | 专利标题
    DE102019125839.1A|DE102019125839A1|2019-09-25|2019-09-25|Method of manufacturing a water hydraulic machine|
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