CN108533605B - Hydraulic motor crank connecting rod with composite wear-resistant surface and preparation method thereof - Google Patents
Hydraulic motor crank connecting rod with composite wear-resistant surface and preparation method thereof Download PDFInfo
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- CN108533605B CN108533605B CN201810678786.0A CN201810678786A CN108533605B CN 108533605 B CN108533605 B CN 108533605B CN 201810678786 A CN201810678786 A CN 201810678786A CN 108533605 B CN108533605 B CN 108533605B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C7/00—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/08—Tin or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C6/00—Coating by casting molten material on the substrate
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
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- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
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- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
The invention discloses a hydraulic motor crank connecting rod with a composite wear-resistant surface, which comprises a connecting rod body, wherein a plurality of Z-shaped micro grooves are designed on the surface of the connecting rod body, tin layers are covered on the surface of the connecting rod body and the surface of the Z-shaped micro grooves, a Babbitt metal layer is covered on the tin layers, sealing belts are formed in the areas of the Z-shaped micro grooves and the periphery of the surface of the connecting rod body, surface textures are arranged on the sealing belts, the number of the Z-shaped micro grooves is 4-8, the surface textures are in any one of cylindrical, rectangular and triangular structures, the thickness of the Babbitt metal layer is 1-2.5 mm, and the roughness is Ra0.8 The performance and the working efficiency of the hydraulic motor (pump) are reduced.
Description
Technical Field
The invention belongs to the technical field of design and processing of a composite wear-resistant surface of a friction pair of a hydraulic motor (pump), and particularly relates to a hydraulic motor crank connecting rod with a composite wear-resistant surface and a preparation method of the hydraulic motor crank connecting rod with the composite wear-resistant surface.
Background
With the development of hydraulic motors (pumps) in the direction of high speed, high pressure and large flow, the wear and abnormal sound phenomena of friction pairs are more serious, which directly limits the performance and service life of the hydraulic motor and even hinders wider application. The connecting rod sliding shoe pair is one of key friction pairs of a radial plunger low-speed high-torque hydraulic motor and plays a decisive role in the bearing capacity of the motor and the mechanical efficiency of the motor. When the hydraulic motor (pump) works, the connecting rod sliding shoe pair bears larger impact load, so that serious abrasion is caused, hydraulic oil leakage is caused seriously, and the performance and the working efficiency of the hydraulic motor (pump) are reduced. The connecting rod slipper pair of the hydraulic motor with reasonable design and the improvement of the lubricating state of the connecting rod slipper pair play a key role in the development of high-performance hydraulic motors (pumps). Researches find that the surface technology can effectively improve the wear resistance. If the surface of the part is subjected to laser cladding treatment, the material structure can be refined, the strength and the rigidity of the material can be improved, and the wear performance can be obviously improved. Or the surface is subjected to composite treatment of plasma nitriding and PVD coating, so that the surface wear resistance can be improved. However, under high speed, high impact load conditions, the wear resistant layer is prone to falling off.
Therefore, the advanced surface engineering technology is adopted, the babbitt metal pouring technology and the surface texture processing technology are combined to improve the surface performance of the iron-based connecting rod, the abrasion is effectively avoided, the service life of the iron-based connecting rod is prolonged, and the iron-based connecting rod is a key technology for the service safety of the high-parameter hydraulic motor. Babbitt metal is the most widely used bearing material with antifriction properties and good seizure, conformability and seizure resistance. Hard phase particles are distributed on a soft matrix of the Babbitt metal, and the concave part in the soft matrix enables a tiny gap to be formed between sliding surfaces, so that an oil storage space and a lubricating oil channel are formed, and friction reduction is facilitated. The hard phase points play a supporting role, and are beneficial to bearing and improving the wear resistance.
Surface texturing allows specific surface properties to be obtained without altering the material itself. In recent years, with the deepening of tribology theory and experimental research, the surface texture is widely regarded by scholars at home and abroad as a controllable technology for changing the mechanical friction performance, the design, processing, test and numerical analysis of the regular surface morphology geometric shape on the surface of a friction pair increasingly become the hot point of research, and the research on the surface texturing of the tribology material is more and more. The surface texture is beneficial to forming fluid dynamic pressure lubrication when the friction pair moves at high speed, and the bearing capacity is improved. The lubricating oil can be stored for secondary oil supply during low-speed movement, and abrasion is reduced. The surface texture can inhibit the self-excited vibration of a friction system and reduce friction noise.
In order to adapt to the development of a hydraulic motor (pump) towards high-speed, high-pressure, large-flow and other high parameters, reduce the abrasion of a key friction pair and improve the performance and the service life of the hydraulic motor, the invention obtains a novel composite surface for preparing a soft coating with surface texture by combining a composite coating technology and a surface texture technology.
Disclosure of Invention
The invention aims to provide a hydraulic motor crank connecting rod with a composite wear-resistant surface, which solves the problems that a hydraulic motor connecting rod sliding shoe pair in the prior art bears a large impact load to cause serious wear, even hydraulic oil leakage is caused, and the performance and the working efficiency of a hydraulic motor (pump) are reduced.
The invention also aims to provide a preparation method of the hydraulic motor crank connecting rod with the composite wear-resistant surface.
The first technical scheme is that the hydraulic motor crank connecting rod with the composite wear-resistant surface comprises a connecting rod body, wherein a plurality of Z-shaped micro grooves are formed in the surface of the connecting rod body, tin layers cover the surface of the connecting rod body and the surface of each Z-shaped micro groove, a Babbitt metal layer covers the tin layers, sealing belts are formed in areas where the plurality of Z-shaped micro grooves are located and the periphery of the surface of the connecting rod body, and surface textures are arranged on the sealing belts.
The first technical aspect of the present invention is also characterized in that,
the number of the Z-shaped micro grooves is 4-8.
The surface texture is any one of cylindrical, rectangular and triangular structures.
The thickness of the Babbitt metal layer is 1 mm-2.5 mm, and the roughness is Ra0.8.
The second technical scheme adopted by the invention is a preparation method of the hydraulic motor crank connecting rod with the composite wear-resistant surface, which is characterized by comprising the following steps:
the Z-shaped micro grooves are symmetrically distributed about the central line of the surface of the connecting rod, the width B of a transverse groove of each Z-shaped micro groove is 0.5-3 mm, the depth h1 of the transverse groove is 0.1-1 mm, the width A of a chute of each Z-shaped micro groove is 0.5-2 mm, the depth h2 of the chute is 1-1.5 mm, the Z-shaped micro grooves are machined in a milling mode, and sealing belts are formed in the areas where the Z-shaped micro grooves are located and the periphery of the surface of the connecting rod body;
step 4.1, heating the cleaned babbitt metal to 380-420 ℃, adding 1-5% by mass of ammonium chloride or 0.5-3% by mass of carbon powder to prevent the babbitt metal from being oxidized, and preserving heat for later use after the babbitt metal is melted;
step 4.2, placing the connecting rod processed in the fine step 3 into a casting clamp and clamping, heating the casting clamp to 350-400 ℃, casting the molten Babbitt metal in the step 4.1 on the surface of the connecting rod, wherein the casting thickness is 2-3 mm, cooling the connecting rod to room temperature in a 120-160 ℃ heat-preserving furnace to avoid generating excessive thermal stress so as to improve the binding force, finishing casting, and taking out the connecting rod;
step 4.3, milling the pouring surface of the connecting rod poured in the step 4.2 to remove redundant babbit alloy, and ensuring that the thickness of the processed babbit alloy is 1-2.5 mm and the roughness is Ra0.8 to obtain the surface of the babbit alloy connecting rod;
the surface texture is arranged on the sealing belt and is symmetrically distributed about the central line of the connecting rod, so that the generated dynamic pressure is uniformly distributed, the connecting rod is prevented from inclining laterally, burrs generated when the surface texture is processed are removed, the surface is cleaned by ultrasonic waves in an alcohol solution, and the hydraulic motor crank connecting rod with the composite wear-resistant surface is prepared after drying.
The second technical aspect of the present invention is also characterized in that,
the technological parameters for processing the Z-shaped micro-groove in the step 1 by milling are as follows: a2-blade coating milling cutter with the diameter of 0.5mm is used, the feeding speed in rough machining is 0.1-0.15 mm/s, the back cutting depth is 0.2-0.3 mm, the rotating speed of an electric spindle is 10000-15000 r/min, the feeding speed in finish machining is 0.25-0.05 mm/s, the back cutting depth is 0.05-0.1 mm, and the rotating speed of the electric spindle is 15000-2000 r/min.
In the step 2, the connecting rod with the Z-shaped micro groove is heated to 850-900 ℃, the temperature is kept for 2 hours, 600-1200 # metallographic abrasive paper is used for polishing the surface to be cast of the connecting rod, specifically, hydrochloric acid with the mass concentration of 5-10 wt% is used for cleaning the surface to be cast of the connecting rod, sodium hydroxide solution with the mass concentration of 5-10 wt% is used for cleaning, and finally, alcohol is used for cleaning for 5-10 minutes in an ultrasonic cleaning machine and drying.
In the step 3, the temperature of the saturated zinc chloride aqueous solution or the mixed aqueous solution of the saturated zinc chloride and the ammonium chloride is 60-70 ℃,
the concrete structure of the casting fixture in the step 4 is as follows: including fixing fixed panel A and fixed panel B on the base, fixed panel A and fixed panel B mutually perpendicular enclose into the right angle, what be connected respectively with fixed panel A and fixed panel B is movable panel A and activity panel B, fixed panel A, fixed panel B, activity panel A and activity panel B enclose jointly and become to pour the cavity, through the bolt-up, it is thermal-insulated cotton to pour to be provided with on the cavity inner wall, wherein, activity panel B bottom is provided with integrated into one piece's V type piece, it has matched with V type groove to open on the base of V type piece corresponding position department, still be provided with the pull rod on the activity panel B, through horizontal push-and-pull rod, can make activity panel B be horizontal linear motion along the V type groove on the base, guarantee plane position precision.
In step 5, the diameter d of the surface texture is 300-1000 μm, and the surface density S of the surface texture isp5-30% of the total; depth h of surface texturep＝10～40μm；
Processing a design surface texture on the sealing strip by using a laser marking machine, wherein the processing parameters are as follows: the laser frequency is 10-30 KHz, the laser scanning speed is 20-50 mm/s, the current is 21-27.5A, and the processing times are 1-10; and removing burrs generated during surface texture processing, polishing with 600-1200 # abrasive paper, and ultrasonically cleaning the surface for 10-15 min.
The invention has the advantages that the hydraulic motor crank connecting rod with the composite wear-resistant surface is cast with the babbit alloy on the surface of the connecting rod processed with the Z-shaped groove, the bonding force between the babbit alloy and the matrix is improved, and simultaneously, the surface texture is introduced, and the surface texture is processed on the surface of the babbit alloy.
Drawings
FIG. 1 is a design drawing of a Z-shaped micro-groove of a crank connecting rod of a hydraulic motor with a composite wear-resistant surface;
FIG. 2 is a schematic structural diagram of a casting jig clamping a crank connecting rod of a hydraulic motor with a composite wear-resistant surface according to the invention;
FIG. 3 is a top view of the casting jig of the present invention holding a hydraulic motor crank link with a composite wear surface;
FIG. 4 is a schematic view of a hydraulic motor crank link with a composite wear surface according to the present invention having a cylindrical surface texture;
FIG. 5 is a schematic view of a hydraulic motor crank link with a composite wear surface according to the present invention having a rectangular surface texture.
In the figure, 1, a connecting rod body, 2, a fixed panel A, 3, a fixed panel B, 4, heat insulation cotton, 5, a Z-shaped micro groove, 6, a movable panel B, 7, a pull rod, 8, a base, 9, a sealing tape, 10, a surface texture and 11, a movable panel A are arranged.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention relates to a hydraulic motor crank connecting rod with a composite wear-resistant surface, which is structurally shown in figure 1 and comprises a connecting rod body 1, wherein a plurality of Z-shaped micro grooves 5 are designed on the surface of the connecting rod body 1, tin layers cover the surface of the connecting rod body 1 and the surfaces of the Z-shaped micro grooves 5, a Babbitt metal layer covers the tin layers, sealing belts 9 are formed in the areas where the plurality of Z-shaped micro grooves 5 are located and the periphery of the surface of the connecting rod body 1, and surface textures 10 are arranged on the sealing belts.
The number of the Z-shaped micro grooves 5 is 4-8.
As shown in fig. 4 and 5, the surface texture 10 has any one of a cylindrical, rectangular, and triangular structure.
The thickness of the Babbitt metal layer is 1 mm-2.5 mm, and the roughness is Ra0.8.
The preparation method of the hydraulic motor crank connecting rod with the composite wear-resistant surface is implemented according to the following steps:
the Z-shaped micro grooves 5 are symmetrically distributed about the central line of the surface of the connecting rod, the width B of a transverse groove of the Z-shaped micro grooves 5 is 0.5-3 mm, the depth h1 of the transverse groove is 0.1-1 mm, the width A of a chute of the Z-shaped micro grooves 5 is 0.5-2 mm, the depth h2 of the chute is 1-1.5 mm, the Z-shaped micro grooves are machined in a milling mode, sealing belts 9 are formed in the area where the Z-shaped micro grooves 5 are located and on the periphery of the surface of the connecting rod body 1, and the machining process parameters of the Z-shaped micro grooves in the milling mode are as follows: using a 2-blade coating milling cutter with the diameter of 0.5mm, wherein the feeding speed in rough machining is 0.1-0.15 mm/s, the back cutting depth is 0.2-0.3 mm, the rotating speed of an electric spindle is 10000-15000 r/min, the feeding speed in finish machining is 0.25-0.05 mm/s, the back cutting depth is 0.05-0.1 mm, and the rotating speed of the electric spindle is 15000-2000 r/min;
step 4.1, heating the cleaned babbitt metal to 380-420 ℃, adding 1-5% by mass of ammonium chloride or 0.5-3% by mass of carbon powder to prevent the babbitt metal from being oxidized, and preserving heat for later use after the babbitt metal is melted;
step 4.2, the connecting rod processed in the fine step 3 is placed into a casting fixture and clamped, the casting fixture is heated to 350-400 ℃, the babbitt metal melted in the step 4.1 is cast on the surface of the connecting rod, the casting thickness is 2-3 mm, the connecting rod is cooled to room temperature in a heat preservation furnace at 120-160 ℃, excessive thermal stress is avoided, the binding force is improved, the casting is finished, and the connecting rod is taken out, wherein as shown in fig. 2 and 3, the casting fixture has the specific structure that: the movable panel B6 and the fixed panel B2 are fixed on a base 8, the fixed panel A2 and the fixed panel B3 are mutually perpendicular to form a right angle, a movable panel A11 and a movable panel B6 are respectively connected with a fixed panel A2 and a fixed panel B3, a pouring cavity is formed by the fixed panel A2, the fixed panel B3, the movable panel A11 and the movable panel B6 in a surrounding mode, the pouring cavity is fastened through bolts, heat insulation cotton 4 is arranged on the inner wall of the pouring cavity, an integrally formed V-shaped block is arranged at the bottom of a movable panel B6, a matched V-shaped groove is formed in the base 8 at the position corresponding to the V-shaped block, a pull rod 7 is further arranged on a movable panel B6, and the movable panel B6 can move horizontally and linearly along the V-shaped groove in the base 8 through horizontally pushing and pulling the pull rod 7, so that the plane;
step 4.3, milling the pouring surface of the connecting rod poured in the step 4.2 to remove redundant babbit alloy, and ensuring that the thickness of the processed babbit alloy is 1-2.5 mm and the roughness is Ra0.8 to obtain the surface of the babbit alloy connecting rod;
on the sealing band 9, a surface texture 10 is provided: processing a design surface texture on the sealing strip by using a laser marking machine, wherein the processing parameters are as follows: the laser frequency is 10-30 KHz, the laser scanning speed is 20-50 mm/s, the current is 21-27.5A, and the processing times are 1-10; removing burrs generated during processing of the surface texture, polishing the burrs by using 600-1200 # abrasive paper, and ultrasonically cleaning the surface for 10-15 min, wherein the diameter d of the surface texture is 300-1000 mu m, and the surface density S of the surface texturep5-30% of the total; depth h of surface texturep10-40 μm; the surface texture 10 is symmetrically distributed about the central line of the connecting rod, so that the generated dynamic pressure is uniformly distributed, the connecting rod is prevented from inclining laterally, burrs generated when the surface texture 10 is processed are removed, the surface is cleaned by ultrasonic waves in an alcohol solution, and the hydraulic motor crank connecting rod with the composite wear-resistant surface is prepared after drying.
According to the hydraulic motor crank connecting rod with the composite wear-resistant surface, the Babbitt metal is poured on the connecting rod of the hydraulic motor of the crank connecting rod, and the surface texture is prepared on the surface of the connecting rod, so that the lubricating property and the wear resistance of the hydraulic motor are improved, and the friction noise is reduced; the preparation method of the hydraulic motor crank connecting rod with the composite wear-resistant surface improves the binding force between the surface of the connecting rod and the babbit alloy, avoids the babbit alloy from falling off under high load, and improves the service performance of a connecting rod friction pair.
Claims (6)
1. The preparation method of the hydraulic motor crank connecting rod with the composite wear-resistant surface is characterized in that the hydraulic motor crank connecting rod with the composite wear-resistant surface comprises a connecting rod body (1), a plurality of Z-shaped micro grooves (5) are designed on the surface of the connecting rod body (1), tin layers cover the surface of the connecting rod body (1) and the surface of each Z-shaped micro groove (5), a Babbitt metal layer covers the tin layers, sealing belts (9) are formed between areas where the Z-shaped micro grooves (5) are located and the periphery of the surface of the connecting rod body (1), surface textures (10) are arranged on the sealing belts, the number of the Z-shaped micro grooves (5) is 4-8, the surface textures (10) are in any one of cylindrical, rectangular and triangular structures, the thickness of the Babbitt metal layer is 1 mm-2.5 mm, the roughness of the Babbitt metal layer is Ra0:
step 1, designing and preparing a Z-shaped micro groove (5):
the Z-shaped micro grooves (5) are symmetrically distributed about the central line of the surface of the connecting rod, the width B of the transverse groove of the Z-shaped micro grooves (5) is =0.5 mm-3 mm, the depth h1 of the transverse groove is =0.1 mm-1 mm, the width A of the inclined groove of the Z-shaped micro grooves (5) is =0.5 mm-2 mm, the depth h2 of the inclined groove is =1 mm-1.5 mm, the Z-shaped micro grooves are machined in a milling mode, and sealing strips (9) are formed in the areas where the Z-shaped micro grooves (5) are located and the periphery of the surface of the connecting rod body (1);
step 2, connecting rod pretreatment: heating the connecting rod with the Z-shaped micro groove (5), preserving heat to eliminate internal stress generated by processing the Z-shaped micro groove (5), polishing the surface to be cast of the connecting rod, removing burrs generated when the Z-shaped micro groove (5) is processed, and removing oxides from the surface to be cast of the connecting rod;
step 3, coating tin on the surface of the connecting rod: immersing the connecting rod processed in the step 2 into a saturated zinc chloride aqueous solution or a mixed aqueous solution of saturated zinc chloride and ammonium chloride to reduce the surface tension, immediately immersing the connecting rod immersed in the solvent into molten tin to hang tin, and enabling the surface hung with tin to be silvery white and bright;
step 4, casting Babbitt metal:
step 4.1, heating the cleaned babbitt alloy to 380-420 ℃, adding 1-5% by mass of ammonium chloride or 0.5-3% by mass of carbon powder to prevent oxidation of the babbitt alloy, and preserving heat for later use after the babbitt alloy is melted;
step 4.2, placing the connecting rod processed in the fine step 3 into a casting clamp and clamping, heating the casting clamp to 350-400 ℃, casting the molten Babbitt metal in the step 4.1 on the surface of the connecting rod, wherein the casting thickness is 2-3 mm, cooling the connecting rod to room temperature in a 120-160 ℃ heat preservation furnace, avoiding generating excessive thermal stress, improving the binding force, finishing casting, and taking out the connecting rod;
step 4.3, milling the pouring surface of the connecting rod poured in the step 4.2 to remove redundant babbit alloy, and ensuring that the thickness of the processed babbit alloy is 1 mm-2.5 mm and the roughness is Ra0.8 to obtain the surface of the babbit alloy connecting rod;
step 5, surface texture design and processing:
the sealing belt (9) is provided with a surface texture (10), the surface texture (10) is symmetrically distributed about the central line of the connecting rod, so that the generated dynamic pressure is uniformly distributed, the connecting rod is prevented from inclining, burrs generated when the surface texture (10) is machined are removed, the surface is cleaned by ultrasonic waves in an alcohol solution, and the hydraulic motor crank connecting rod with the composite wear-resistant surface is prepared after drying.
2. The method for preparing a hydraulic motor crank connecting rod with a composite wear-resistant surface according to claim 1, wherein the process parameters for machining the Z-shaped micro-groove in the step 1 by milling are as follows: a2-blade coating milling cutter with the diameter of 0.5mm is used, the feeding speed in rough machining is 0.1-0.15 mm/s, the back cutting depth is 0.2-0.3 mm, the rotating speed of an electric spindle is 10000-15000 r/min, the feeding speed in finish machining is 0.25-0.05 mm/s, the back cutting depth is 0.05-0.1 mm, and the rotating speed of the electric spindle is 15000-2000 r/min.
3. The method for preparing a hydraulic motor crank connecting rod with a composite wear-resistant surface according to claim 1, wherein in the step 2, the connecting rod with the Z-shaped micro grooves is heated to 850-900 ℃, the temperature is kept for 2 hours, 600-1200 # metallographic abrasive paper is used for polishing the surface to be cast of the connecting rod, and specifically, hydrochloric acid with the mass concentration of 5-10 wt% is used for cleaning the surface to be cast of the connecting rod, then sodium hydroxide solution with the mass concentration of 5-10 wt% is used for cleaning, finally, alcohol is used for cleaning in an ultrasonic cleaning machine for 5-10 min, and drying is carried out.
4. The method for preparing a hydraulic motor crank connecting rod with a composite wear-resistant surface according to claim 1, wherein the temperature of the saturated zinc chloride aqueous solution or the mixed aqueous solution of the saturated zinc chloride and the ammonium chloride in the step 3 is 60-70 ℃.
5. The method for preparing the hydraulic motor crank connecting rod with the composite wear-resistant surface as claimed in claim 1, wherein the casting jig in the step 4 is specifically structured as follows: comprises a fixed panel A (2) and a fixed panel B (3) which are fixed on a base (8), the fixed panel A (2) and the fixed panel B3 mutually vertically enclose into a right angle, a movable panel A (11) and a movable panel B (6) are respectively connected with the fixed panel A (2) and the fixed panel B (3), the fixed panel A (2), the fixed panel B (3), the movable panel A (11) and the movable panel B (6) jointly enclose into a pouring cavity, heat insulation cotton (4) is arranged on the inner wall of the pouring cavity through bolt fastening, wherein an integrally formed V-shaped block is arranged at the bottom of the movable panel B (6), a matched V-shaped groove is formed on the base (8) at the position corresponding to the V-shaped block, a pull rod (7) is also arranged on the movable panel B (6), and the movable panel B (6) can make horizontal linear motion along the V-shaped groove on the base (8) through the horizontal push-pull rod (7), and the plane position precision is ensured.
6. The method for preparing a hydraulic motor crank connecting rod with a composite wear-resistant surface according to claim 1, wherein in the step 5, the diameter d = 300-1000 μm of the surface texture and the surface texture surface density Sp= 5-30%; depth h of surface texturep=10~40μm；
Processing a design surface texture on the sealing strip by using a laser marking machine, wherein the processing parameters are as follows: the laser frequency is 10-30 KHz, the laser scanning speed is 20-50 mm/s, the current is 21-27.5A, and the processing times are 1-10; and removing burrs generated during surface texture processing, polishing with 600-1200 # abrasive paper, and ultrasonically cleaning the surface for 10-15 min.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201335088Y (en) * | 2009-01-20 | 2009-10-28 | 四机赛瓦石油钻采设备有限公司 | Crosshead |
| CN202572040U (en) * | 2012-03-30 | 2012-12-05 | 鞍钢股份有限公司 | Novel roller grinder is with holding in palm tile |
| DE102012014114A1 (en) * | 2012-07-17 | 2014-01-23 | Daimler Ag | Roughening of metal surfaces, comprises carrying out material-removing treatment of surface, and generating material-removing treatment structures having substantially orthogonal development for estimated loading direction and undercuts |
| CN205207436U (en) * | 2015-11-25 | 2016-05-04 | 湖南崇德工业科技有限公司 | Plain bearing bush insulation system and axle bush |
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2018
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| CN201335088Y (en) * | 2009-01-20 | 2009-10-28 | 四机赛瓦石油钻采设备有限公司 | Crosshead |
| CN202572040U (en) * | 2012-03-30 | 2012-12-05 | 鞍钢股份有限公司 | Novel roller grinder is with holding in palm tile |
| DE102012014114A1 (en) * | 2012-07-17 | 2014-01-23 | Daimler Ag | Roughening of metal surfaces, comprises carrying out material-removing treatment of surface, and generating material-removing treatment structures having substantially orthogonal development for estimated loading direction and undercuts |
| CN205207436U (en) * | 2015-11-25 | 2016-05-04 | 湖南崇德工业科技有限公司 | Plain bearing bush insulation system and axle bush |
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| 表面织构技术对高水基液压马达滑靴副摩擦学性能影响研究;王博;《中国矿业大学硕士学位论文》;20170501;第1-24页 * |
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| CN108533605A (en) | 2018-09-14 |
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