CN116197625B

CN116197625B - Preparation process of high-pressure-resistant wear-resistant cylinder sleeve

Info

Publication number: CN116197625B
Application number: CN202310473188.0A
Authority: CN
Inventors: 范兴宽; 范家宏
Original assignee: Anhui Jusheng Accessories Of Petroleum Drilling Co ltd
Current assignee: Anhui Jusheng Accessories Of Petroleum Drilling Co ltd
Priority date: 2023-04-28
Filing date: 2023-04-28
Publication date: 2023-07-21
Anticipated expiration: 2043-04-28
Also published as: CN116197625A

Abstract

The invention provides a preparation process of a high-pressure-resistant and wear-resistant cylinder sleeve, which belongs to the technical field of casting and comprises the following steps: forming a jacket by processing, carrying out sand blasting treatment on the inner wall of the jacket, coating adhesive slurry on the formed sand blasting surface, and forming an elastic buffer layer after curing; forming an inner sleeve by machining, and assembling the inner sleeve into the outer sleeve so that the outer wall of the inner sleeve is clung to the buffer layer; and processing to form a metal ring, forming a screw thread on the periphery of the metal ring, coating bonding slurry on the screw thread, and then assembling the screw thread on the end face of the inner sleeve. The cylinder sleeve provided by the invention has the advantages that the preparation process is simple, the process and the structure are reasonable, and the buffer layer plays a role in bonding and also plays a role in buffering, so that the cracking probability of the cylinder sleeve in the process of processing and using is greatly reduced; meanwhile, the elastic effect of the buffer layer plays a role in centralizing and buffering to a certain extent, so that the eccentric wear probability of the cylinder sleeve is reduced, and the production cost and the use cost of users are reduced.

Description

Preparation process of high-pressure-resistant wear-resistant cylinder sleeve

Technical Field

The invention belongs to the technical field of casting, and relates to a preparation process of an anti-high-pressure wear-resistant cylinder sleeve.

Background

The cylinder sleeve is a short cylinder sleeve and is inlaid in a cylinder barrel of the cylinder body to form a combustion chamber together with the piston and the cylinder cover. In the mechanical product equipment, the cylinder sleeve is matched with the piston and the plunger pair, and is a main component for various power transmission, and is also a core component of internal combustion diesel engines, gasoline engines and hydraulic (air compression, forging and the like) mechanical equipment. Common cylinder liners are divided into two main types, namely dry cylinder liners and wet cylinder liners. The cylinder liner with the back surface not contacted with cooling water is called a dry cylinder liner, and the cylinder liner with the back surface contacted with the cooling water is a wet cylinder liner. The dry cylinder sleeve has the advantages of thinner thickness, simple structure and convenient processing. The wet cylinder sleeve is in direct contact with cooling water, so that the cooling of the engine is facilitated, and the miniaturization and the light weight of the engine are facilitated

Wear of the cylinder liner is mainly represented by four forms of fatigue wear, abrasive wear, adhesive wear and corrosive wear. Fatigue wear is normal wear, and is generally analyzed by using a delamination theory; abrasive particles are generally derived from impurities inhaled by air, ash in fuel oil and oxides or carbon deposits generated by combustion, abrasive dust generated by friction and the like, and are also generally considered to be normal abrasion, because dust in air and impurities in fuel oil are unavoidable, while in western regions, sand storm is serious, a large amount of dust exists in air, and abrasive particle abrasion is considered to be abnormal abrasion; adhesive wear is abnormal wear, often caused by excessive load or excessive temperature in the cylinder, and directly results in the generation of pulling of the cylinder.

At present, most of cylinder liners are integral structural members made of metal materials, quenching treatment is not carried out during manufacturing, the hardness of the friction surface of the inner surface layer of the cylinder liner, which is contacted with a piston and a plunger pair, is generally about HB30, the abrasion resistance is poor, and the problems of frequent maintenance or premature scrapping of the whole machine caused by excessively rapid abrasion failure exist. Therefore, a need exists for a pressure-resistant and wear-resistant cylinder liner.

Disclosure of Invention

Aiming at the defects existing in the prior art, the invention aims to provide the preparation process of the high-pressure-resistant wear-resistant cylinder sleeve, which is simple in preparation process, reasonable in process and structure, and the buffer layer plays a role in buffering while playing a role in bonding, so that the cracking probability of the cylinder sleeve in the process of processing and using is greatly reduced; meanwhile, the elastic effect of the buffer layer plays a role in centralizing and buffering to a certain extent, so that the eccentric wear probability of the cylinder sleeve is reduced, and the production cost and the use cost of users are reduced.

To achieve the purpose, the invention adopts the following technical scheme:

the invention provides a preparation process of a high-pressure-resistant wear-resistant cylinder sleeve, which comprises the following steps:

forming a jacket by processing, carrying out sand blasting treatment on the inner wall of the jacket, coating adhesive slurry on the formed sand blasting surface, and forming an elastic buffer layer after curing;

forming an inner sleeve by machining, and assembling the inner sleeve into the outer sleeve so that the outer wall of the inner sleeve is clung to the buffer layer;

and processing to form a metal ring, forming a screw thread on the periphery of the metal ring, coating bonding slurry on the screw thread, and then assembling the screw thread on the end face of the inner sleeve.

The cylinder sleeve provided by the invention has the advantages that the preparation process is simple, the process and the structure are reasonable, and the buffer layer plays a role in bonding and also plays a role in buffering, so that the cracking probability of the cylinder sleeve in the process of processing and using is greatly reduced; meanwhile, the elastic effect of the buffer layer plays a role in centralizing and buffering to a certain extent, so that the eccentric wear probability of the cylinder sleeve is reduced, and the production cost and the use cost of users are reduced.

The anti-rust capability of the jacket is improved through sand blasting, the service life of the product is prolonged, meanwhile, the roughness and friction force are increased, and the phenomenon of jacket removal is prevented. The phenomenon of sleeve detachment is prevented again through the buffer layer and the metal ring, the sealing effect of the cylinder sleeve is increased, slurry leakage from the back is prevented, and potential safety hazards in the use process are avoided.

As a preferable technical scheme of the invention, the processing process of the jacket comprises the following steps:

and (3) melting the continuous casting blank at 1400-1500 ℃, adding reinforcing particles, cooling to 1200-1300 ℃, preserving heat for 1-2 hours, injecting into a die, cooling to obtain a crude product, and sequentially carrying out heat treatment and surface treatment on the crude product to obtain the jacket.

Wherein the melting temperature may be 1400 ℃, 1410 ℃, 1420 ℃, 1430 ℃, 1440 ℃, 1450 ℃, 1460 ℃, 1470 ℃, 1480 ℃, 1490 ℃ or 1500 ℃, and then the temperature may be raised to 1200 ℃, 1210 ℃, 1220 ℃, 1230 ℃, 1240 ℃, 1250 ℃, 1260 ℃, 1270 ℃, 1280 ℃, 1290 ℃ or 1300 ℃, and the holding time may be 1h, 1.1h, 1.2h, 1.3h, 1.4h, 1.5h, 1.6h, 1.7h, 1.8h, 1.9h or 2.0h, but is not limited to the recited values, and other non-recited values within the range of values are equally applicable.

In the casting process, the reinforced particles and the continuous casting blank are put into a medium-frequency induction melting furnace, the continuous casting blank is rapidly melted under the action of an electromagnetic field, the reinforced particles are not affected by the electromagnetic field, and meanwhile, the reinforced particles are not melted by the molten liquid in a short time, so that the molten liquid with the reinforced particles uniformly dispersed is obtained. The coat obtained by casting the melt can ensure that the reinforcing particles are uniformly distributed, and the reinforcing particles and the coat matrix are fused into a whole, so that the reinforcing particles are firmly combined in the coat matrix, and the falling of the reinforcing particles caused by stripping of the reinforcing particles due to abrasion in the use process can be effectively prevented.

The invention adds reinforcing particles into the continuous casting billet, which has the following functions: (1) The expansion of the plastic region of the matrix structure of the jacket is prevented, and the discontinuity of the plastic region is caused, so that dislocation slip is prevented, and the plastic flow of the melt is prevented; (2) The existence of the reinforcing particles concentrates local stress of the outer sleeve matrix, so that the possibility of local adhesion is increased, and the generation of double-slip grinding surfaces is promoted; (3) The reinforced particles are uniformly distributed in the outer sleeve matrix, so that the dispersion strengthening and deformation resistance effects are exerted, and the wear-resisting effect is realized.

The invention is particularly limited in that the melting temperature is 1400-1500 ℃, and the melting temperature directly influences the mechanical properties of the cast jacket. The improvement of the melting temperature is beneficial to improving the fluidity of the molten liquid, so that the molten liquid fully permeates the die, the rejection rate is reduced, the improvement of mechanical properties is beneficial to the control of the melting temperature within the range of 1400-1500 ℃, graphite is thinned, and the matrix structure of the outer sleeve is compact, thereby improving the tensile strength of the outer sleeve, improving the relative hardness and the quality coefficient and slightly improving the elastic modulus. However, the melting temperature cannot be too high, and the too high temperature wastes energy and has adverse effects on mechanical properties. With the increase of the melting temperature, the nitrogen content and the hydrogen content in the melt slightly increase, the oxygen content is greatly reduced, pinhole defects are easily caused, and the improvement of the tensile strength and the hardness of the jacket is not facilitated.

The invention particularly limits the heat preservation time after melting to 1-2h, can form a good flowing state between the reinforced particles and the molten liquid within the heat preservation time range, ensures that the suspension state of the ceramic particles can be maintained by the resistance of the molten liquid while the casting is smoothly completed, and can not be deposited and accumulated under the action of gravity, thereby ensuring the uniform distribution of the reinforced particles in the cast coat matrix and ensuring the integral strength and wear resistance of the material.

The invention cools the melt after adding the reinforcing particles because the maximum of internal stress of the jacket matrix is the portion of the jacket matrix between the reinforcing particles and the surface and increases with increasing load, which is detrimental to the tensile strength of the jacket matrix and easily causes local damage to the jacket matrix structure. In the high temperature melting process, the plastic region of the melt surrounds the reinforcing particles, and at this time, the reinforcing particles can plastically flow together with the jacket matrix, so that the stress near the surface of the jacket matrix is more concentrated, and the local damage tendency of the jacket matrix is increased. In order to slow down the plastic flow of the outer sleeve matrix, the invention slightly reduces the temperature of the molten liquid after adding the reinforcing particles, slows down the flow of the reinforcing particles, and promotes the formation of a double-slip grinding surface.

In some embodiments, the cooling rate is 10-25 ℃/s, which may be, for example, 10 ℃/s, 11 ℃/s, 12 ℃/s, 13 ℃/s, 14 ℃/s, 15 ℃/s, 16 ℃/s, 17 ℃/s, 18 ℃/s, 19 ℃/s, 20 ℃/s, 21 ℃/s, 22 ℃/s, 23 ℃/s, 24 ℃/s, or 25 ℃/s, but is not limited to the recited values, and other non-recited values within the range of values are equally applicable.

The cooling process of the jacket is a process of dissipating heat of the jacket until the temperature of the casting and the ambient temperature reach balance, the invention limits the cooling speed of the casting to 10-25 ℃, and fine crystal strengthening, phase change strengthening, precipitation strengthening and dislocation strengthening modes can be realized in the temperature range. And the cooling speed is too high or too low, so that grain refinement can be realized, and the improvement on mechanical properties is not obvious.

As a preferred embodiment of the present invention, the reinforcing particles include any one or a combination of at least two of titanium carbide, silicon carbide, and tungsten carbide.

According to different material abrasion mechanisms, fatigue abrasion, abrasive particle abrasion and material characteristics in four types of abrasion have direct relation, and the fatigue abrasion and the abrasive particle abrasion can be well resisted by compounding reinforced particles of different materials. Further preferred reinforcing particles of the present invention are titanium carbide, silicon carbide and tungsten carbide, wherein titanium carbide and silicon carbide are used to resist fatigue wear and tungsten carbide is used to resist abrasive wear.

The fatigue wear is caused by the fact that under the action of alternating load, the continuous plug of dislocation causes the formation of cracks, and the expansion of the cracks to the surface causes the surface material to fall off to form abrasive dust. The titanium carbide particles and the silicon carbide particles have high modulus and high bending strength, can prevent dislocation slip to lead dislocation to generate plug volume and stress concentration in front of the particles, and the coat matrix can be subjected to work hardening. In the load transmission process, the titanium carbide particles and the silicon carbide particles bear partial stress of the outer sleeve matrix to deflect the expansion cracks, so that crack paths are bent, more breaking energy is consumed, and the tensile strength and the hardness of the material are improved.

The hardness of the tungsten carbide particles is much higher than that of the outer jacket matrix, and this difference in hardness also results in a difference in wear rate. In the initial stage of abrasion, tungsten carbide particles are flush with the surface of the jacket matrix, and have equal probability of contacting abrasive particles and loads. The outer sleeve matrix is subjected to very serious cutting under the condition of initial contact with abrasive particles, is worn quickly and is recessed, and the tungsten carbide particles are high in hardness, so that the cutting effect of the abrasive particles can be effectively resisted, and the wear rate is relatively slow and gradually raised. In addition, because the abrasive particles cannot penetrate into the protruding tungsten carbide particles in the abrasive particle abrasion, further abrasion of the outer sleeve matrix is prevented, and the outer sleeve matrix can be restarted to be abraded only when the tungsten carbide particles are abraded to be level with the outer sleeve matrix again, so that the tungsten carbide particles can effectively resist the abrasive particle abrasion of the abrasive particles to the outer sleeve matrix.

Wherein the reinforcing particles are subjected to an alloying treatment prior to addition of the reinforcing particles.

Wherein the alloying treatment comprises: titanium or nickel plating is carried out on the surface of the reinforced particles.

The invention limits the alloying of the surface of the reinforced particles by titanium plating or nickel plating, improves the contact capability of the molten liquid and the reinforced particles by carrying out alloying pretreatment on the surface of the ceramic particles, forms a three-layer structure of ceramic particles, metal plating and coat matrix metal, improves the wettability of a reaction system, and solves the interface bonding problem of the ceramic particles reinforced metal matrix composite material.

The reinforcing particles may be added in an amount of 5 to 10% by volume of the continuous casting blank, for example, 5.0%, 5.5%, 6.0%, 6.5%, 7.0%, 7.5%, 8.0%, 8.5%, 9.0%, 9.5% or 10.0%, but are not limited to the recited values, and other non-recited values within the range are equally applicable.

The particle diameter of the reinforcing particles is 50 to 60. Mu.m, for example, 50 μm, 51 μm, 52 μm, 53 μm, 54 μm, 55 μm, 56 μm, 57 μm, 58 μm, 59 μm or 60. Mu.m, but the reinforcing particles are not limited to the above-mentioned values, and other non-mentioned values within the above-mentioned range are applicable.

The invention is particularly limited to reinforcing particles having a particle size of 50-60 μm, and the probability of fracture and destruction of the reinforcing particles is greater when the particle size of the reinforcing particles is less than 50 μm, i.e., reinforcing particles having a small particle size are easily crushed under the same normal load. The plastic region areas of the reinforcing particles of 50 μm and 60 μm sizes do not differ significantly. If the particle diameter of the reinforcing particles exceeds 60 μm, stress concentration tends to occur easily, chipping tends to be large, and in addition, when the particle diameter exceeds 60 μm, the shape of the plastic region of the reinforcing particle diameter is more remarkable as the change in friction coefficient is made, and the opening of the plastic region gradually transits from the surface of the reinforcing particles to the surface of the jacket, because the adhesion property is enhanced due to the increase in friction coefficient, and the drawing phenomenon tends to occur easily.

As a preferable technical scheme of the invention, the heat treatment comprises quenching treatment and tempering treatment on the crude product in sequence.

The quenching treatment process comprises the following steps: heating the crude product to 1000-1100 ℃ at a heating rate of 5-15 ℃/min, preserving heat for 1-2h, and immediately immersing in a quenching medium for cooling.

The heating rate may be 5 ℃/min, 6 ℃/min, 7 ℃/min, 8 ℃/min, 9 ℃/min, 10 ℃/min, 11 ℃/min, 12 ℃/min, 13 ℃/min, 14 ℃/min or 15 ℃/min, the heating temperature may be 1000 ℃, 1010 ℃, 1020 ℃, 1030 ℃, 1040 ℃, 1050 ℃, 1060 ℃, 1070 ℃, 1080 ℃, 1090 ℃ or 1100 ℃, and the incubation time may be 1.0h, 1.1h, 1.2h, 1.3h, 1.4h, 1.5h, 1.6h, 1.7h, 1.8h, 1.9h or 2.0h, but is not limited to the values listed, and other values not listed in the range of values are equally applicable.

The micro-structure of the outer sleeve directly influences the machining property and the wear resistance of the outer sleeve, and the proper micro-structure can be obtained through proper heat treatment process. The quenching treatment of the jacket comprises three processes of heating, preserving heat at an austenitizing temperature and cooling, wherein the quenching temperature (namely the austenitizing temperature) affects the solubility of carbon and chromium in austenite. The invention is particularly limited in that the quenching temperature is 1000-1100 ℃, when the quenching temperature is higher than 1100 ℃, the content of chromium and carbon dissolved in austenite is increased, the hardness of the martensite obtained after cooling and transformation is also high, but more residual austenite can be generated, so that the structure is coarsened, the stress concentration is caused by serious surface oxidation, and a crack source is easy to form; when the quenching temperature is lower than 1000 ℃, the carbon content in the martensite is lower, so that the hardness is reduced; in addition, the too low quenching temperature can cause that part of pearlite is not transformed, and the quenched jacket matrix is a mixed structure of martensite and pearlite, so that the hardness is high but the wear resistance is poor.

The tempering treatment process comprises the following steps: heating the quenched crude product to 150-200 ℃ at a heating rate of 1-5 ℃/min, preserving heat for 1-2h, and cooling with a furnace.

The heating rate may be 1.0 ℃/min, 1.5 ℃/min, 2.0 ℃/min, 2.5 ℃/min, 3.0 ℃/min, 3.5 ℃/min, 4.0 ℃/min, 4.5 ℃/min or 5.0 ℃/min, the heating temperature may be 150 ℃, 155 ℃, 160 ℃, 165 ℃, 170 ℃, 175 ℃, 180 ℃, 185 ℃, 190 ℃, 195 ℃ or 200 ℃, and the heat preservation time may be 1.0h, 1.1h, 1.2h, 1.3h, 1.4h, 1.5h, 1.6h, 1.7h, 1.8h, 1.9h or 2.0h, but is not limited to the recited values, and other values not recited in the numerical range are equally applicable.

The tempering treatment is carried out after the quenching treatment, and is mainly used for removing quenching stress and obtaining a jacket matrix structure of tempered martensite.

As a preferred embodiment of the present invention, the blasting speed is 40-60m/s, for example, 40m/s, 42m/s, 44m/s, 46m/s, 48m/s, 50m/s, 52m/s, 54m/s, 56m/s, 58m/s or 60m/s, but not limited to the recited values, and other non-recited values within the range are equally applicable.

The air pressure of the blasting is 50 to 150MPa, and may be, for example, 50MPa, 60MPa, 70MPa, 80MPa, 90MPa, 100MPa, 110MPa, 120MPa, 130MPa, 140MPa or 150MPa, but is not limited to the recited values, and other non-recited values within the range of the recited values are equally applicable.

The time of the blasting is 5-10min, for example, 5.0min, 5.5min, 6.0min, 6.5min, 7.0min, 7.5min, 8.0min, 8.5min, 9.0min, 9.5min or 10.0min, but not limited to the recited values, and other non-recited values within the range are applicable.

The particle size of the sand used for the blasting is 0.1 to 2. Mu.m, for example, 0.1 μm, 0.2 μm, 0.4 μm, 0.6 μm, 0.8 μm, 1.0 μm, 1.2 μm, 1.4 μm, 1.6 μm, 1.8 μm or 2.0 μm, but the present invention is not limited to the above-mentioned values, and other values not mentioned in the above-mentioned numerical ranges are applicable.

According to the invention, the inner surface of the outer sleeve is subjected to sand blasting treatment to form a rough grinding surface area on the inner surface of the outer sleeve, different sand blasting effects and surface roughness can be realized by controlling the sand blasting speed, pressure, granularity of sand materials and sand blasting time, so that the interface bonding strength of the inner surface of the outer sleeve and the buffer layer is improved in order to promote good bonding of the outer sleeve base material and the buffer layer, and the condition that the interface bonding is poor is caused by too rough or too fine inner surface of the outer sleeve.

As a preferred embodiment of the present invention, the binder paste includes a matrix paste and ceramic particles, and the mass ratio of the matrix paste to the ceramic particles is 1 (0.1-0.5), for example, may be 1:0.1, 1:0.2, 1:0.3, 1:0.4 or 1:0.5, but is not limited to the recited values, and other non-recited values within the range of values are equally applicable.

The matrix slurry comprises (by weight) 1 (5-10) of silica sol and (by weight) of alumina sol, wherein the solid content of the alumina sol is 20-30% and the solid content of the silica sol is 40-50%.

Wherein the mass ratio of the silica sol to the alumina sol can be 1:5, 1:5.5, 1:6, 1:6.5, 1:7, 1:7.5, 1:8, 1:8.5, 1:9, 1:9.5 or 1:10, the solid content of the alumina sol is 20wt%, 21wt%, 22wt%, 23wt%, 24wt%, 25wt%, 26wt%, 27wt%, 28wt%, 29wt% or 30wt%, and the solid content of the silica sol can be 40wt%, 41wt%, 42wt%, 43wt%, 44wt%, 45wt%, 46wt%, 47wt%, 48wt%, 49wt% or 50wt%, but is not limited to the recited values, and other non-recited values in the numerical range are equally applicable.

The invention adopts the silica sol and the alumina sol as matrix slurry, the silica sol can be regarded as alkali metal silicate with ultra-high modulus, the content of alkali metal oxide is very low, salting out and whitening are not easy to occur, the drying speed is high, the water resistance is good, but the adhesiveness is slightly poor. In order to achieve both high-temperature bonding strength and room-temperature curing speed of the adhesive, the silica sol and the alumina sol are compounded for use. The alumina sol is dried and dehydrated to generate active alumina, and the alumina can only generate crystal phase change without decomposition at high temperature, and can generate aluminosilicate glass phase after being combined with silicon at high temperature, so that the alumina has very good high-temperature bonding effect and elastic buffering effect.

The invention aims to add ceramic particles into matrix slurry: (1) The matrix sizing agent is modified, the wettability between the buffer layer and the outer sleeve is improved, the interface performance between the buffer layer and the outer sleeve is enhanced, part of ceramic particles react with the collective sizing agent to generate glass phases such as aluminosilicate, zirconium-aluminum composite silicate and the like, on one hand, the bonding effect is achieved to improve the bonding strength between the ceramic particles and the outer sleeve, on the other hand, the glass phase modification effect is achieved to form a specific elastic buffer layer, the wettability between the buffer layer and the outer sleeve is enhanced, and the interface contact between the buffer layer and the outer sleeve is good; (2) The surface roughness of the buffer layer formed after solidification is improved by adding the ceramic particles, and the mechanical anchoring effect is enhanced by embedding the rough ceramic particles on the surface of the buffer layer with the sand blasting surface on the inner side of the outer sleeve. Good interfacial bond strength between the buffer layer and the jacket is achieved by improving wettability and enhancing mechanical anchoring.

As a preferred embodiment of the present invention, the material of the ceramic particles comprises AlN, zrO, zrO ₂ 、B ₄ C、Si ₃ N ₄ Or TiB ₂ Any one or a combination of at least two of these.

The particle diameter of the ceramic particles is 20 to 30. Mu.m, for example, 20 μm, 21 μm, 22 μm, 23 μm, 24 μm, 25 μm, 26 μm, 27 μm, 28 μm, 29 μm or 30 μm, but is not limited to the recited values, and other non-recited values within the range of values are equally applicable.

The invention is particularly limited in that the particle size of the ceramic particles is 20-30 mu m, the smaller the particle size of the ceramic reinforced particles is, the more uniform the dispersion is, and the more excellent the mechanical and corrosion resistance of the prepared buffer layer is. However, particles smaller than 20 μm cause agglomeration of particles, are not dispersible, and have high production cost.

In a preferred embodiment of the present invention, the adhesive slurry may be applied to a thickness of 250 to 300. Mu.m, for example, 250 μm, 255 μm, 260 μm, 265 μm, 270 μm, 275 μm, 280 μm, 285 μm, 290 μm, 295 μm or 300. Mu.m, but the present invention is not limited to the values listed, and other values not listed in the range are applicable.

After the adhesive slurry is coated, the ceramic particles in the adhesive slurry move towards the sand blasting surface under the action of centrifugal force by rotating by taking the axis of the length direction of the outer sleeve as a rotating shaft.

The rotation time is 10-20min, such as 10min, 11min, 12min, 13min, 14min, 15min, 16min, 17min, 18min, 19min or 20min; the rotation speed is 700-750r/min, for example, 700r/min, 710r/min, 715r/min, 720r/min, 725r/min, 730r/min, 735r/min, 740r/min, 745r/min or 750r/min, but not limited to the recited values, and other non-recited values within the range are equally applicable.

The invention adopts centrifugal coating to the adhesive slurry, and can realize the change and control of the thickness of the buffer layer by adjusting the rotation speed and the rotation time. One of the purposes of the present invention is to enhance the mechanical anchoring effect between the buffer layer and the blast surface, so that in order to enhance the mechanical engagement, the present invention makes the ceramic particles in the bonding slurry to migrate along the radial direction of the jacket toward the blast surface by centrifugal coating, so that the blast surface of the jacket and the outer surface of the buffer layer have a geometric structure to achieve the mechanical strengthening combination.

Furthermore, the invention defines the rotational speed and the rotational time, considering that the ceramic particles on the one hand increase the wettability of the buffer layer and on the other hand enhance the mechanical anchoring with the sand blasted face of the jacket. Therefore, the distribution of the ceramic particles in the buffer layer needs to be controlled, if the rotation speed is too high or the rotation time is too long, the ceramic particles are concentrated on the periphery of the buffer layer, the roughness of the periphery of the buffer layer is improved, and when the ceramic particles are combined with the sand blasting surface, pores appear at the interface due to mismatching of the roughness at the combined interface, so that mechanical engagement cannot be realized, and the mechanical anchoring effect is affected.

As a preferable technical scheme of the invention, the processing process of the inner sleeve comprises the following steps:

and forming and sintering the inner sleeve raw material to obtain the inner sleeve.

When the inner sleeve is processed, the inner wall size of the outer sleeve is processed according to the inner peripheral size of the outer sleeve, so that the inner periphery of the outer sleeve is in interference fit with the outer periphery of the inner sleeve.

The inner sleeve raw material comprises at least one metal oxide, and the metal element in the metal oxide comprises aluminum element, zirconium element, chromium element, manganese element, yttrium element, magnesium element, lanthanum element, silicon element, barium element or cerium element.

The sintering adopts a gradient sintering process, and comprises the following steps:

heating the processed blank to 300-400 ℃, preserving heat for 1-2h, then heating to 650-750 ℃ at a heating rate of 5-10 ℃/min, preserving heat for 0.5-1h, and then continuously heating to 1050-1060 ℃ and sintering at high temperature for 0.5-1h.

Wherein the heating temperature can be 300 ℃, 310 ℃, 320 ℃, 330 ℃, 340 ℃, 350 ℃, 360 ℃, 370 ℃, 380 ℃, 390 ℃ or 400 ℃, can be kept for 1.0h, 1.1h, 1.2h, 1.3h, 1.4h, 1.5h, 1.6h, 1.7h, 1.8h, 1.9h or 2.0h, the heating rate can be 5.0 ℃/min, 5.5 ℃/min, 6.0 ℃/min, 6.5 ℃/min, 7.0 ℃/min, 7.5 ℃/min, 8.0 ℃/min, 8.5 ℃/min, 9.0 ℃/min, 9.5 ℃/min or 10.0 ℃/min, can be heated to 650 ℃, 660 ℃, 670 ℃, 680 ℃, 690 ℃, 700 ℃, 710 ℃, 720 ℃, 730 ℃, 740 ℃ or 750 ℃, the temperature may then be maintained for 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95 or 1.0h, and the temperature may be further raised to 1050 ℃, 1051 ℃, 1052 ℃, 1053 ℃, 1054 ℃, 1055 ℃, 1056, 1057 ℃, 1058 ℃, 1059 or 1060 ℃, with sintering at high temperature for 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95 or 1.0h, although not limited to the values recited, other values not recited in this range may be equally suitable.

As a preferred technical scheme of the present invention, the assembling process of the inner sleeve and the outer sleeve includes:

heating the outer sleeve to 500-600 ℃, placing the outer sleeve into the inner sleeve along the axial direction of the outer sleeve after the outer sleeve is heated and expanded, enabling the outer wall of the inner sleeve to cling to the buffer layer, and naturally cooling the outer sleeve; in the cooling process, the inner part of the inner sleeve is pressurized to 1-2MPa for 10-20min, so that the inner sleeve, the buffer layer and the outer sleeve are compacted.

Wherein the outer sleeve may be heated to 500 ℃, 510 ℃, 520 ℃, 530 ℃, 540 ℃, 550 ℃, 560 ℃, 570 ℃, 580 ℃, 590 ℃ or 600 ℃, the inner sleeve may be pressurized to 1.0MPa, 1.1MPa, 1.2MPa, 1.3MPa, 1.4MPa, 1.5MPa, 1.6MPa, 1.7MPa, 1.8MPa, 1.9MPa or 2.0MPa, and the duration may be 10min, 11min, 12min, 13min, 14min, 15min, 16min, 17min, 18min, 19min or 20min, but is not limited to the recited values, and other non-recited values within the range of values are equally applicable.

According to the invention, the outer peripheral dimension of the inner sleeve is processed according to the inner peripheral dimension of the outer sleeve in an interference fit manner, the outer sleeve is heated and heated during assembling of the inner sleeve, so that the outer sleeve is heated and expanded, at the moment, the inner periphery of the outer sleeve is inserted into the outer sleeve, and the inner peripheral dimension of the outer sleeve is restored after the outer sleeve is naturally cooled, so that the inner sleeve is tightly held into a whole, the situation that the inner sleeve and the outer sleeve fall off during use is avoided, the service life of the cylinder sleeve is prolonged, the working safety and reliability of the cylinder sleeve are ensured, and the use cost is reduced.

The invention does not require or limit the tolerance range of the interference fit between the inner periphery of the outer sleeve and the outer periphery of the inner sleeve, for example, the tolerance of the interference fit between the inner periphery of the outer sleeve and the outer periphery of the inner sleeve can be 1-2mm.

The invention also defines that in the cooling process of the outer sleeve, the outer periphery of the inner sleeve is pressurized in the inner sleeve, and under the action of pressure, the outer sleeve is expanded along the radial direction, and simultaneously the inner periphery of the inner sleeve is contracted along the radial direction when the outer sleeve is cooled, and the inner sleeve and the outer sleeve are combined more tightly through the expansion or contraction of the inner sleeve and the outer sleeve along the radial direction in opposite directions.

The numerical ranges recited herein include not only the recited point values, but also any point values between the recited numerical ranges that are not recited, and are limited to, and for the sake of brevity, the invention is not intended to be exhaustive of the specific point values that are included in the recited ranges.

Compared with the prior art, the invention has the beneficial effects that:

Drawings

FIG. 1 is a schematic structural view of a cylinder liner according to an embodiment of the present invention;

wherein: 1-a jacket; 2-an inner sleeve; 3-a buffer layer; 4-sand blasting surface; a 5-metal ring; 6-screw threads.

Detailed Description

The technical scheme of the invention is described in detail below with reference to specific embodiments and attached drawings. The examples described herein are specific embodiments of the present invention for illustrating the concept of the present invention; the description is intended to be illustrative and exemplary in nature and should not be construed as limiting the scope of the invention in its aspects. In addition to the embodiments described herein, those skilled in the art can adopt other obvious solutions based on the disclosure of the claims and the specification thereof, including those adopting any obvious substitutions and modifications to the embodiments described herein.

The drawings in the present specification are schematic views, which assist in explaining the concept of the present invention, and schematically show the shapes of the respective parts and their interrelationships. It should be understood that for the purpose of clearly showing the structure of various parts of embodiments of the present invention, the drawings are not drawn to the same scale and like reference numerals are used to designate like parts in the drawings. The technical scheme of the invention is further described by the following specific embodiments.

It is to be understood that in the description of the present invention, the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.

It should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.

In one embodiment, the invention provides a cylinder sleeve, as shown in fig. 1, which comprises an outer sleeve 1 and an inner sleeve 2 positioned inside the outer sleeve 1, wherein a buffer layer 3 is arranged between the outer sleeve 1 and the inner sleeve 2, and the end surface of the inner sleeve 2 is provided with a metal ring 5.

In another specific embodiment, the invention provides a cylinder sleeve preparation process, which specifically comprises the following steps:

(1) Casting coat 1: melting a continuous casting blank at 1400-1500 ℃, adding surface alloyed reinforcing particles, wherein the adding amount of the reinforcing particles is 5-10% of the volume of the continuous casting blank, the reinforcing particles are formed by mixing titanium carbide, silicon carbide and tungsten carbide in proportion, the particle size of the reinforcing particles is 50-60 mu m, then cooling to 1200-1300 ℃, preserving heat for 1-2h, then injecting into a die, and cooling to room temperature at a cooling rate of 10-25 ℃/s to obtain a crude product;

(2) And (3) heat treatment: heating the crude product to 1000-1100 ℃ at a heating rate of 5-15 ℃/min, preserving heat for 1-2h, immediately immersing the crude product into a quenching medium for cooling, heating the quenched crude product to 150-200 ℃ at a heating rate of 1-5 ℃/min, preserving heat for 1-2h, and then cooling along with a furnace;

(3) Sand blasting: spraying sand material of 0.1-2 μm at a speed of 40-60m/s on the inner wall of the outer sleeve 1 by using a spraying machine, continuously spraying sand for 5-10min, wherein the air pressure of sand spraying is 50-150MPa;

(4) Preparing a bonding slurry: mixing ceramic particles with the particle size of 20-30 mu m with matrix slurry according to the mass ratio of 1 (0.1-0.5) to obtain bonding slurry, wherein the matrix slurry comprises silica sol and alumina sol with the mass ratio of 1 (5-10), the solid content of the alumina sol is 20-30wt%, and the solid content of the silica sol is 40-50wt%;

(5) Forming a buffer layer 3 having elasticity: coating 250-300 mu m thick adhesive slurry on the sand blasting surface 4 on the inner wall of the outer sleeve 1, enabling the outer sleeve 1 to rotate around the shaft at the rotating speed of 700-750r/min, enabling ceramic particles in the adhesive slurry to move towards the sand blasting surface 4 under the action of centrifugal force, and curing the adhesive slurry after rotating for 10-20min to form an elastic buffer layer 3;

(6) Preparing an inner sleeve 2: placing the oxide raw materials into a sand mill for mixing and grinding, adding an adhesive, a plasticizer, a release agent and an enhancer into the sand mill, drying and granulating through a drying tower, homogenizing and ageing, and forming to obtain a blank, and processing the inner wall size of the blank of the outer sleeve 1 according to the inner peripheral size of the outer sleeve 1 in an interference fit manner;

Heating the processed blank to 300-400 ℃, preserving heat for 1-2h, then heating to 650-750 ℃ at a heating rate of 5-10 ℃/min, preserving heat for 0.5-1h, and then continuously heating to 1050-1060 ℃ and sintering at high temperature for 0.5-1h;

(7) Assembling an inner sleeve 2: heating the outer sleeve 1 to 500-600 ℃, putting the outer sleeve 1 into the inner sleeve 2 along the axial direction of the outer sleeve 1 after the outer sleeve 1 is heated and expanded, enabling the outer wall of the inner sleeve 2 to cling to the buffer layer 3, and naturally cooling the outer sleeve 1; in the cooling process, pressurizing the inside of the inner sleeve 2 to 1-2MPa for 10-20min, so that the inner sleeve 2, the buffer layer 3 and the outer sleeve 1 are compacted;

(8) And (3) processing to form a metal ring, forming a screw thread 6 on the periphery of the metal ring, coating adhesive slurry on the screw thread 6, and then assembling the metal ring to the end face of the inner sleeve.

Example 1

The embodiment provides a cylinder sleeve preparation process, which specifically comprises the following steps:

(1) Casting coat 1: adding reinforced particles with nickel plated on the surface after melting a continuous casting blank at 1400 ℃, wherein the addition amount of the reinforced particles is 5% of the volume of the continuous casting blank, the reinforced particles are formed by mixing titanium carbide, silicon carbide and tungsten carbide according to the mass ratio of 1:0.5:2, the particle size of the reinforced particles is 60 mu m, then cooling to 1200 ℃, preserving heat for 2 hours, then injecting into a mould, and cooling to room temperature at the cooling rate of 10 ℃/s to obtain a crude product;

(2) And (3) heat treatment: heating the crude product to 1000 ℃ at a heating rate of 5 ℃/min, preserving heat for 2 hours, immediately immersing the crude product into a quenching medium for cooling, heating the quenched crude product to 150 ℃ at a heating rate of 1 ℃/min, preserving heat for 2 hours, and then cooling along with a furnace;

(3) Sand blasting: spraying sand with the thickness of 0.1 mu m on the inner wall of the outer sleeve 1 at the speed of 40m/s by using a spraying machine, and continuously spraying sand for 10min, wherein the air pressure of the sand spraying is 50MPa;

(4) Preparing a bonding slurry: mixing ZrO ceramic particles with the particle size of 20 mu m with matrix slurry according to the mass ratio of 1:0.5 to obtain bonding slurry, wherein the matrix slurry comprises silica sol and alumina sol with the mass ratio of 1:5, the solid content of the alumina sol is 20wt%, and the solid content of the silica sol is 50wt%;

(5) Forming a buffer layer 3 having elasticity: coating 250 mu m thick adhesive slurry on the sand blasting surface 4 on the inner wall of the outer sleeve 1, rotating the outer sleeve 1 around the shaft at the rotating speed of 700r/min, moving ceramic particles in the adhesive slurry to the direction of the sand blasting surface 4 under the action of centrifugal force, and curing the adhesive slurry after rotating for 20min to form an elastic buffer layer 3;

(6) Preparing an inner sleeve 2: placing the manganese oxide raw material into a sand mill for mixing and grinding, adding an adhesive, a plasticizer, a release agent and an enhancer into the stirring mill, drying and granulating through a drying tower, homogenizing and ageing, and forming to obtain a blank, and processing the inner wall size of the blank of the outer sleeve 1 according to the inner peripheral size of the outer sleeve 1 in an interference fit manner;

Heating the processed and formed blank to 300 ℃, preserving heat for 2 hours, then heating to 650 ℃ at a heating rate of 5 ℃/min, preserving heat for 1 hour, and continuously heating to 1050 ℃ and sintering for 1 hour at a high temperature;

(7) Assembling an inner sleeve 2: heating the outer sleeve 1 to 500 ℃, putting the outer sleeve 1 into the inner sleeve 2 along the axial direction of the outer sleeve 1 after the outer sleeve 1 is heated and expanded, enabling the outer wall of the inner sleeve 2 to cling to the buffer layer 3, and naturally cooling the outer sleeve 1; in the cooling process, pressurizing the inside of the inner sleeve 2 to 1MPa for 20min, so that the inner sleeve 2, the buffer layer 3 and the outer sleeve 1 are compacted;

Example 2

(1) Casting coat 1: adding reinforcing particles with titanium plated on the surface after melting a continuous casting blank at 1420 ℃, wherein the adding amount of the reinforcing particles is 6% of the volume of the continuous casting blank, the reinforcing particles are formed by mixing titanium carbide, silicon carbide and tungsten carbide according to the mass ratio of 1:1:2, the particle size of the reinforcing particles is 58 mu m, then cooling to 1220 ℃, preserving heat for 1.8h, then injecting into a die, and cooling to room temperature at the cooling rate of 13 ℃/s to obtain a crude product;

(2) And (3) heat treatment: heating the crude product to 1020 ℃ at a heating rate of 7 ℃/min, preserving heat for 1.8h, immediately immersing the crude product into a quenching medium for cooling, heating the quenched crude product to 160 ℃ at a heating rate of 2 ℃/min, preserving heat for 1.8h, and then cooling along with a furnace;

(3) Sand blasting: spraying sand with the thickness of 0.2 mu m on the inner wall of the outer sleeve 1 at the speed of 45m/s by using a spraying machine, and continuously spraying sand for 8min, wherein the air pressure of the sand spraying is 70MPa;

(4) Preparing a bonding slurry: subsequently, zrO having a particle size of 22 μm was introduced ₂ Mixing ceramic particles and matrix slurry according to a mass ratio of 1:0.4 to obtain bonding slurry, wherein the matrix slurry comprises silica sol and alumina sol with a mass ratio of 1:6, the solid content of the alumina sol is 22wt%, and the solid content of the silica sol is 48wt%;

(5) Forming a buffer layer 3 having elasticity: coating 260 mu m thick adhesive slurry on the sand blasting surface 4 on the inner wall of the outer sleeve 1, rotating the outer sleeve 1 around the shaft at a rotating speed of 710r/min, moving ceramic particles in the adhesive slurry to the direction of the sand blasting surface 4 under the action of centrifugal force, and curing the adhesive slurry after 18min of rotation to form an elastic buffer layer 3;

(6) Preparing an inner sleeve 2: mixing and grinding the alumina raw material in a sand mill, adding an adhesive, a plasticizer, a release agent and an enhancer in the stirring mill, drying and granulating by a drying tower, homogenizing and ageing, and forming to obtain a blank, and processing the inner wall size of the blank of the outer sleeve 1 according to the inner peripheral size of the outer sleeve 1 in an interference fit manner;

Heating the processed and formed blank to 320 ℃, preserving heat for 1.8 hours, then heating to 670 ℃ at a heating rate of 6 ℃/min, preserving heat for 0.8 hours, and continuously heating to 1052 ℃ and sintering at high temperature for 0.8 hours;

(7) Assembling an inner sleeve 2: heating the outer sleeve 1 to 520 ℃, putting the outer sleeve 1 into the inner sleeve 2 along the axial direction of the outer sleeve 1 after the outer sleeve 1 is heated and expanded, enabling the outer wall of the inner sleeve 2 to cling to the buffer layer 3, and naturally cooling the outer sleeve 1; in the cooling process, pressurizing the inside of the inner sleeve 2 to 1.2MPa for 18min, so that the inner sleeve 2, the buffer layer 3 and the outer sleeve 1 are compacted;

Example 3

(1) Casting coat 1: adding reinforcing particles with nickel plated on the surface after melting a continuous casting blank at 1450 ℃, wherein the adding amount of the reinforcing particles is 7% of the volume of the continuous casting blank, the reinforcing particles are formed by mixing titanium carbide, silicon carbide and tungsten carbide according to the mass ratio of 1:1:1.5, the particle size of the reinforcing particles is 55 mu m, then cooling to 1250 ℃, preserving heat for 1.5h, then injecting into a die, and cooling to room temperature at the cooling rate of 16 ℃/s to obtain a crude product;

(2) And (3) heat treatment: heating the crude product to 1050 ℃ at a heating rate of 10 ℃/min, preserving heat for 1.5h, immediately immersing the crude product into a quenching medium for cooling, heating the quenched crude product to 170 ℃ at a heating rate of 3 ℃/min, preserving heat for 1.5h, and cooling along with a furnace;

(3) Sand blasting: spraying sand with the thickness of 0.5 mu m on the inner wall of the outer sleeve 1 at the speed of 50m/s by using a spraying machine, and continuously spraying sand for 7min, wherein the air pressure of the sand spraying is 100MPa;

(4) Preparing a bonding slurry: subsequently B having a particle size of 25. Mu.m ₄ Mixing the C ceramic particles and matrix slurry according to the mass ratio of 1:0.3 to obtain bonding slurry, wherein the matrix slurry comprises silica sol and alumina sol with the mass ratio of 1:8, the solid content of the alumina sol is 25wt%, and the silica sol is mixed with the alumina sol to obtain the ceramic composite materialThe solid content is 45wt%;

(5) Forming a buffer layer 3 having elasticity: coating a sand blasting surface 4 on the inner wall of the outer sleeve 1 with adhesive slurry with the thickness of 280 mu m, rotating the outer sleeve 1 around a shaft at the rotating speed of 720r/min, moving ceramic particles in the adhesive slurry to the direction of the sand blasting surface 4 under the action of centrifugal force, and curing the adhesive slurry after rotating for 15min to form an elastic buffer layer 3;

(6) Preparing an inner sleeve 2: mixing and grinding zirconia raw materials in a sand mill, adding an adhesive, a plasticizer, a release agent and an enhancer in the stirring mill, drying and granulating by a drying tower, homogenizing and ageing, and forming to obtain a blank, and processing the inner wall size of the blank of the outer sleeve 1 according to the inner peripheral size of the outer sleeve 1 in an interference fit manner;

Heating the processed and formed blank to 350 ℃, preserving heat for 1.5h, then heating to 700 ℃ at the heating rate of 7 ℃/min, preserving heat for 0.7h, and continuously heating to 1055 ℃ and sintering at high temperature for 0.7h;

(7) Assembling an inner sleeve 2: heating the outer sleeve 1 to 550 ℃, putting the outer sleeve 1 into the inner sleeve 2 along the axial direction of the outer sleeve 1 after the outer sleeve 1 is heated and expanded, enabling the outer wall of the inner sleeve 2 to cling to the buffer layer 3, and naturally cooling the outer sleeve 1; in the cooling process, pressurizing the inside of the inner sleeve 2 to 1.5MPa for 15min, so that the inner sleeve 2, the buffer layer 3 and the outer sleeve 1 are compacted;

Example 4

(1) Casting coat 1: adding reinforced particles with titanium plated on the surface after melting a continuous casting blank at 1470 ℃, wherein the addition amount of the reinforced particles is 8% of the volume of the continuous casting blank, the reinforced particles are formed by mixing titanium carbide, silicon carbide and tungsten carbide according to the mass ratio of 1:2:3, the particle size of the reinforced particles is 52 mu m, then cooling to 1280 ℃, preserving heat for 1.2h, and then injecting the reinforced particles into a die, and cooling to room temperature at the cooling rate of 20 ℃/s to obtain a crude product;

(2) And (3) heat treatment: heating the crude product to 1070 ℃ at a heating rate of 12 ℃/min, preserving heat for 1.2h, immediately immersing the crude product into a quenching medium for cooling, heating the quenched crude product to 180 ℃ at a heating rate of 4 ℃/min, preserving heat for 1.2h, and then cooling along with a furnace;

(3) Sand blasting: spraying sand with the thickness of 0.7 mu m on the inner wall of the outer sleeve 1 at the speed of 55m/s by using a spraying machine, and continuously spraying sand for 6min, wherein the air pressure of the sand spraying is 120MPa;

(4) Preparing a bonding slurry: subsequently Si with a particle size of 28 μm ₃ N ₄ Mixing ceramic particles and matrix slurry according to a mass ratio of 1:0.2 to obtain bonding slurry, wherein the matrix slurry comprises silica sol and alumina sol with a mass ratio of 1:9, the solid content of the alumina sol is 28wt%, and the solid content of the silica sol is 42wt%;

(5) Forming a buffer layer 3 having elasticity: coating a 290 mu m thick adhesive slurry on a sand blasting surface 4 on the inner wall of the outer sleeve 1, enabling the outer sleeve 1 to rotate around an axis at a rotating speed of 740r/min, enabling ceramic particles in the adhesive slurry to move towards the sand blasting surface 4 under the action of centrifugal force, and curing the adhesive slurry after rotating for 12min to form an elastic buffer layer 3;

(6) Preparing an inner sleeve 2: placing the magnesium oxide raw material into a sand mill for mixing and grinding, adding an adhesive, a plasticizer, a release agent and an enhancer into the stirring mill, drying and granulating through a drying tower, homogenizing and ageing, and forming to obtain a blank, and processing the inner wall size of the blank of the outer sleeve 1 according to the inner peripheral size of the outer sleeve 1 in an interference fit manner;

Heating the processed and formed blank to 380 ℃, preserving heat for 1.2h, then heating to 720 ℃ at a heating rate of 8 ℃/min, preserving heat for 0.6h, and continuously heating to 1057 ℃ and sintering at high temperature for 0.6h;

(7) Assembling an inner sleeve 2: heating the outer sleeve 1 to 580 ℃, putting the outer sleeve 1 into the inner sleeve 2 along the axial direction of the outer sleeve 1 after the outer sleeve 1 is heated and expanded, enabling the outer wall of the inner sleeve 2 to cling to the buffer layer 3, and naturally cooling the outer sleeve 1; in the cooling process, pressurizing the inside of the inner sleeve 2 to 1.8MPa for 12min, so that the inner sleeve 2, the buffer layer 3 and the outer sleeve 1 are compacted;

Example 5

(1) Casting coat 1: adding reinforcing particles with nickel plated on the surface after melting a continuous casting blank at 1500 ℃, wherein the adding amount of the reinforcing particles is 10% of the volume of the continuous casting blank, the reinforcing particles are formed by mixing titanium carbide, silicon carbide and tungsten carbide according to the mass ratio of 1:2:1.5, the particle size of the reinforcing particles is 50 mu m, then cooling to 1300 ℃, preserving heat for 1h, then injecting into a die, and cooling to room temperature at the cooling rate of 25 ℃/s to obtain a crude product;

(2) And (3) heat treatment: heating the crude product to 1100 ℃ at a heating rate of 15 ℃/min, preserving heat for 1h, immediately immersing the crude product into a quenching medium for cooling, heating the quenched crude product to 200 ℃ at a heating rate of 5 ℃/min, preserving heat for 1h, and then cooling along with a furnace;

(3) Sand blasting: spraying sand with the thickness of 2 mu m on the inner wall of the outer sleeve 1 at the speed of 60m/s by using a spraying machine, and continuously spraying sand for 5min, wherein the air pressure of sand spraying is 150MPa;

(4) Preparing a bonding slurry: tiB having a particle size of 30 μm is then applied ₂ Mixing ceramic particles and matrix slurry according to a mass ratio of 1:0.1 to obtain bonding slurry, wherein the matrix slurry comprises silica sol and alumina sol with a mass ratio of 1:10, the solid content of the alumina sol is 30wt%, and the solid content of the silica sol is 40wt%;

(5) Forming a buffer layer 3 having elasticity: coating a 300 mu m thick adhesive slurry on a sand blasting surface 4 on the inner wall of the outer sleeve 1, rotating the outer sleeve 1 around a shaft at a rotating speed of 750r/min, moving ceramic particles in the adhesive slurry to the direction of the sand blasting surface 4 under the action of centrifugal force, and curing the adhesive slurry after rotating for 10min to form an elastic buffer layer 3;

(6) Preparing an inner sleeve 2: mixing and grinding the silicon oxide raw material in a sand mill, adding an adhesive, a plasticizer, a release agent and an enhancer in the stirring mill, drying and granulating by a drying tower, homogenizing and ageing, and forming to obtain a blank, and processing the inner wall size of the blank of the outer sleeve 1 according to the inner peripheral size of the outer sleeve 1 in an interference fit manner;

Heating the processed and formed blank to 400 ℃, preserving heat for 1h, then heating to 750 ℃ at a heating rate of 10 ℃/min, preserving heat for 0.5h, and continuously heating to 1060 ℃ and sintering at high temperature for 0.5h;

(7) Assembling an inner sleeve 2: heating the outer sleeve 1 to 600 ℃, putting the outer sleeve 1 into the inner sleeve 2 along the axial direction of the outer sleeve 1 after the outer sleeve 1 is heated and expanded, enabling the outer wall of the inner sleeve 2 to cling to the buffer layer 3, and naturally cooling the outer sleeve 1; in the cooling process, pressurizing the inside of the inner sleeve 2 to 2MPa for 10min, so that the inner sleeve 2, the buffer layer 3 and the outer sleeve 1 are compacted;

Example 6

The present example provides a cylinder liner manufacturing process, which differs from example 1 in that no reinforcing particles are added to the melt of the continuous casting billet in step (1). Other operating parameters and process steps were exactly the same as in example 1.

Example 7

This example provides a cylinder liner manufacturing process differing from example 1 in that only 5% of titanium carbide particles, and no silicon carbide particles or tungsten carbide particles, are added to the melt of the continuous casting billet in step (1). Other operating parameters and process steps were exactly the same as in example 1.

Example 8

This example provides a cylinder liner manufacturing process differing from example 1 in that only 5% of silicon carbide particles, and no titanium carbide particles or tungsten carbide particles, are added to the melt of the continuous casting billet in step (1). Other operating parameters and process steps were exactly the same as in example 1.

Example 9

This example provides a cylinder liner manufacturing process differing from example 1 in that only 5% of tungsten carbide particles, and no silicon carbide particles or titanium carbide particles, are added to the melt of the continuous casting billet in step (1). Other operating parameters and process steps were exactly the same as in example 1.

Example 10

This example provides a cylinder liner manufacturing process that differs from example 1 in that the surface of the reinforcing particles is not plated with nickel in step (1), and other operating parameters and process steps are exactly the same as in example 1.

Example 11

The present embodiment provides a cylinder liner manufacturing process, which is different from embodiment 1 in that step (3) is omitted, the inner circumference of the jacket 1 is not sandblasted, and other operation parameters and process steps are exactly the same as embodiment 1.

Example 12

The present example provides a cylinder liner manufacturing process, which differs from example 1 in that no ceramic particles are added to the bonding slurry in step (4), and other operating parameters and process steps are exactly the same as in example 1.

Example 13

This example provides a cylinder liner manufacturing process which differs from example 1 in that after the bonding paste is applied in step (5), the jacket 1 is not rotated, but is directly cured to form the buffer layer 3, and other operating parameters and process steps are exactly the same as in example 1.

The cylinder liners prepared in examples 1-13 were tested: the tensile strength of the cylinder sleeve is detected by a tensile testing machine, and the hardness of the cylinder sleeve is detected by a Brinell hardness tester.

Abrasion test: and measuring the wear rate of the cylinder sleeve by a capacitance meter, wherein the wear measuring stroke selected during measurement is that a measuring circle is selected every 20mm below the end face of the convex edge of the cylinder sleeve, 10 measuring points are selected on the measuring circle at equal intervals, and when the cylinder sleeve is continuously used, the wear of each measuring point is measured every 50h, and the wear rate is obtained by taking the average value.

The test results are shown in table 1:

table 1 test results for cylinder liners prepared in example 1-example 13

As can be seen from the data in Table 1, the preparation process provided by the invention can be used for preparing the compression-resistant and wear-resistant cylinder sleeve.

As can be seen from the test data provided in examples 6-9 compared to example 1, the addition of no reinforcing particles or only one reinforcing particle to the melt results in an increase in the wear rate of the liner.

As can be seen from the comparison of the test data provided in example 10 with example 1, the wettability between the reinforcing particles and the jacket matrix is deteriorated due to the lack of nickel plating on the surface of the reinforcing particles, and the reinforcing particles are easily dropped when worn, thereby affecting the wear resistance of the cylinder liner.

As can be seen from comparison of the test data provided in example 11 with example 1, the interface bonding strength between the buffer layer 3 and the jacket 1 is insufficient due to the fact that the inner portion Zhou Pensha of the jacket 1 is not aligned, so that the tensile strength of the cylinder liner is affected, and the phenomenon of uncapping is easy to occur.

As can be seen from the comparison of the test data provided in example 12 with example 1, the interface bonding strength between the buffer layer 3 and the sandblasted surface 4 is insufficient due to the fact that the ceramic particles are not added into the buffer layer 3, so that the tensile strength of the cylinder liner is affected, and the phenomenon of uncapping is also easy to occur.

As can be seen from a comparison of the test data provided in example 13 with example 1, the tensile strength of the cylinder liner provided in example 13 is slightly lower than that of example 1 and the wear rate is slightly higher than that of example 1, which indicates that the improvement in tensile strength is facilitated and the reduction in wear rate is also facilitated by rotating the jacket 1 to alter the radial distribution of ceramic particles in the bond paste.

The inventor declares that the above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be apparent to those skilled in the art that any changes or substitutions that are easily conceivable within the technical scope of the present invention disclosed by the present invention fall within the scope of the present invention and the disclosure.

Claims

1. The preparation process of the high-pressure-resistant wear-resistant cylinder sleeve is characterized by comprising the following steps of:

forming an outer sleeve by processing, carrying out sand blasting treatment on the inner wall of the outer sleeve, coating adhesive slurry on the formed sand blasting surface, and forming a buffer layer after solidification;

processing to form a metal ring, wherein threads are formed on the periphery of the metal ring, and the threads are assembled to the end face of the inner sleeve after being coated with bonding slurry;

the bonding slurry comprises matrix slurry and ceramic particles, wherein the mass ratio of the matrix slurry to the ceramic particles is 1 (0.1-0.5);

the matrix slurry comprises (5-10) silicon dioxide sol and aluminum oxide sol in a mass ratio of 1, wherein the solid content of the aluminum oxide sol is 20-30wt%, and the solid content of the silicon dioxide sol is 40-50wt%;

The material of the ceramic particles comprises AlN, zrO, zrO ₂ 、B ₄ C、Si ₃ N ₄ Or TiB ₂ Any one or a combination of at least two of the following;

the particle size of the ceramic particles is 20-30 mu m.

2. The process for preparing the high-pressure-resistant and wear-resistant cylinder sleeve according to claim 1, wherein the processing of the outer sleeve comprises the following steps:

melting a continuous casting blank at 1400-1500 ℃, adding reinforcing particles, cooling to 1200-1300 ℃, preserving heat for 1-2 hours, injecting into a die, cooling to obtain a crude product, and sequentially carrying out heat treatment and surface treatment on the crude product to obtain the jacket;

the cooling speed is 10-25 ℃/s.

3. The process for preparing a high pressure resistant and wear resistant cylinder liner according to claim 2, wherein the reinforcing particles comprise any one or a combination of at least two of titanium carbide, silicon carbide or tungsten carbide;

alloying the reinforcing particles before adding the reinforcing particles;

the alloying treatment includes: plating titanium or nickel on the surface of the reinforced particles;

the addition amount of the reinforcing particles accounts for 5-10% of the continuous casting blank volume;

the particle size of the reinforcing particles is 50-60 mu m.

4. The process for preparing the high-pressure-resistant and wear-resistant cylinder liner according to claim 2, wherein the heat treatment comprises quenching treatment and tempering treatment of the crude product in sequence;

The quenching treatment process comprises the following steps: heating the crude product to 1000-1100 ℃ at a heating rate of 5-15 ℃/min, preserving heat for 1-2h, and immediately immersing the crude product into a quenching medium for cooling;

5. The process for preparing the high-pressure-resistant and wear-resistant cylinder liner according to claim 1, wherein the sand blasting speed is 40-60m/s;

the air pressure of the sand blasting is 50-150MPa;

the sand blasting time is 5-10min;

the granularity of the sand adopted by the sand blasting is 0.1-2 mu m.

6. The process for preparing the high-pressure-resistant and wear-resistant cylinder liner according to claim 1, wherein the coating thickness of the bonding slurry is 250-300 μm;

after the bonding slurry is coated, the axis of the length direction of the outer sleeve is taken as a rotating shaft to rotate, and ceramic particles in the bonding slurry move towards the direction of the sand blasting surface under the action of centrifugal force;

the rotating time is 10-20min, and the rotating speed is 700-750r/min.

7. The process for preparing the high-pressure-resistant and wear-resistant cylinder sleeve according to claim 1, wherein the processing procedure of the inner sleeve comprises the following steps:

Molding and sintering the raw material of the inner sleeve to obtain the inner sleeve;

when the inner sleeve is processed, the inner wall size of the outer sleeve is processed according to the inner peripheral size of the outer sleeve, so that the inner periphery of the outer sleeve is in interference fit with the outer periphery of the inner sleeve;

the inner sleeve raw material comprises at least one metal oxide, wherein metal elements in the metal oxide comprise aluminum element, zirconium element, chromium element, manganese element, yttrium element, magnesium element, lanthanum element, silicon element, barium element or cerium element;

heating the processed blank to 300-400 ℃, preserving heat for 1-2h, heating to 650-750 ℃ at a heating rate of 5-10 ℃/min, preserving heat for 0.5-1h, continuously heating to 1050-1060 ℃ and sintering for 0.5-1h.

8. The process for preparing the high-pressure-resistant and wear-resistant cylinder liner according to claim 1, wherein the assembling process of the inner liner and the outer liner comprises the following steps: