Machining method for improving production quality of hydraulic mount of engine

Abstract

The invention relates to the technical field of automobile damping part manufacturing, in particular to a machining method for improving the production quality of an engine hydraulic mount, which comprises the following steps of rubber formula optimization, inner pipe structure improvement and machining, part surface comprehensive treatment, rubber vulcanization forming and bushing assembly. Automatic riveting, liquid filling and whole-process quality inspection and packaging are carried out; a'pipe and gasket 'combined inner pipe structure is adopted to replace a forged part, and an automatic riveting process is matched, so that the production and manufacturing cost and threshold are reduced, and the assembly firmness is improved; a rubber formula is optimized to adapt to a high-temperature and high-frequency vibration working condition, and by combining part surface deoiling, sand blasting pretreatment and mandrel hole anti-rust oil protection, rubber aging attenuation is delayed, and the anti-corrosion capacity is enhanced; the problems that a traditional product is prone to falling off during assembly, the damping performance is not stable, key parts are prone to corrosion and the like are effectively solved, and the use stability, durability and the finished product yield of the engine hydraulic mount are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile shock-absorbing component manufacturing, in particular to a machining method for improving the production quality of an engine hydraulic mount. BACKGROUND

[0002] With the development of the automobile industry towards high power, light weight and low noise, the performance and quality of the engine hydraulic mount, as a key shock-absorbing component, directly determine the driving comfort, stability and service life of the engine. However, there are two major problems in the traditional machining process of the engine hydraulic mount: first, the structure design and machining mode are unreasonable, the inner tube is usually made of a forged piece structure, which not only has high mold and machining costs, but also requires large-scale production to meet the supply requirements, making it difficult to adapt to small-batch customized production demands. At the same time, the traditional manual riveting process has insufficient precision, which easily leads to loose and falling parts, affecting the stability of the shock-absorbing function; second, the performance adaptability and durability are insufficient, the rubber formula is not fully matched with the high-temperature and high-frequency vibration working conditions of the engine, the performance decays significantly after high-temperature aging, and the surface treatment process of the parts is simple, the key parts such as screw holes are easily corroded and failed in humid and high-temperature environments, and the liquid damping characteristics of the filled liquid are fixed, making it difficult to meet the high performance requirements of modern automobiles for shock-absorbing effect. The above problems result in low yield and short service life of the traditional engine hydraulic mount, which cannot meet the development needs of the automobile industry. Therefore, a machining method for improving the production quality of the engine hydraulic mount is proposed to solve the above problems. SUMMARY

[0003] The present application provides a machining method for improving the production quality of an engine hydraulic mount to solve the technical problems in the prior art.

[0004] The technical solution of the present application to solve the above technical problems is as follows: a machining method for improving the production quality of an engine hydraulic mount, comprising the following steps: Step one: rubber formula optimization: according to the working condition requirements of the engine hydraulic mount, the rubber raw materials with heat resistance, damping characteristics and mechanical properties are selected, and the rubber materials meeting the long-term use strength and fatigue resistance of the product are prepared by adjusting the raw material ratio and adding functional additives; Step two: inner tube structure improvement and machining: the bushing of the engine hydraulic mount contains inner and outer tubular metal parts, and a rubber barrier layer is arranged between the two tubular metal parts to realize radial shock absorption; the inner tube adopts a combination structure of pipe material and gasket, the pipe material and gasket are first riveted to realize preliminary fixation, and then the connection is strengthened by welding process, forming an inner tube assembly meeting the mechanical design requirements of the product; Step three: comprehensive treatment of the surface of the part: after processing, the part is deoiled, sandblasted and pretreated to remove surface impurities and oxide layers; then, anti-rust oil is applied to the product mandrel hole to improve the corrosion resistance of the screw hole part; before the riveting process, silicon oil is applied to the riveting contact surface to optimize the assembly performance of the part; Step four: rubber vulcanization and bushing assembly: the optimized rubber material is coated and vulcanized with the pretreated inner and outer tubular metal parts to firmly combine the rubber and metal parts to form a bushing semi-finished product; the vulcanization temperature, pressure and time parameters are controlled during the vulcanization process to ensure sufficient rubber vulcanization and avoid defects such as lack of glue, bubbles and under-vulcanization; Step five: automatic riveting and liquid filling: the bushing semi-finished product and other components are pressed and assembled using automatic riveting equipment, and the pressing force and displacement parameters are precisely controlled to ensure firm connection of the components; after pressing and assembly, the product is filled with a modified formula shock-absorbing liquid, and the filling port is sealed to prevent liquid leakage; Step six: full-process quality inspection and packaging: the finished product after pressing and filling is subjected to appearance detection, sealing detection, mechanical property detection and shock-absorbing performance detection; the qualified product is cleaned and dried, then packaged in a anti-collision packaging method, and the production process is completed.

[0005] In a preferred embodiment, in step one, the rubber raw material includes a heat-resistant rubber base material and functional additives, and the functional additives include reinforcing agents, anti-aging agents and plasticizers.

[0006] In a preferred embodiment, in step two, the pipe material is a standard specification metal pipe material obtained through conventional procurement channels; the gasket is made of metal sheet material processed by stamping process, and the shape and thickness of the gasket are adjusted according to the size requirements of the inner tube.

[0007] In a preferred embodiment, in step three, the anti-rust oil is a lubricating anti-rust oil with good adhesion and long-lasting rust prevention, and the silicon oil is a high-viscosity silicon oil meeting food-grade or industrial-grade standards.

[0008] In a preferred embodiment, in step four, the vulcanization process uses a mold pressing vulcanization method, and the vulcanization equipment is equipped with a real-time temperature and pressure monitoring system to ensure stable process parameters during vulcanization.

[0009] In a preferred embodiment, in step five, the shock-absorbing liquid is a compound liquid with a modified formula, and the automatic riveting equipment is equipped with pressure sensors and displacement sensors to real-time feedback the pressing state and automatically adjust the parameters.

[0010] In a preferred embodiment, in step six, the sealing test is performed using a pressure test or a vacuum test, the mechanical performance test includes torsional torque test and rubber tensile strength test, and the shock absorption performance test is performed using a dedicated shock absorption test equipment.

[0011] The beneficial effects of this invention are: 1. This invention adopts a combined inner tube structure of "pipe + gasket" and an automated riveting process to replace the traditional forging and manual riveting mode. This not only reduces the production cost and processing threshold, adapts to the needs of multi-batch production, but also improves the firmness and consistency of parts assembly, avoids the problem of loosening and falling off, and ensures the stability of shock absorption function.

[0012] 2. This invention optimizes the rubber formula to match the high temperature and high frequency vibration conditions of the engine. Combined with the surface degreasing, sandblasting pretreatment and anti-rust oil protection process of the spindle hole, it not only delays the performance degradation of the rubber after high temperature aging and enhances the long-term stability of the product's shock absorption performance, but also improves the corrosion resistance of the parts, avoids rust failure of key parts, and extends the service life of the product.

[0013] 3. This invention improves the damping liquid formula and combines it with the silicone oil coating process on the contact surface before riveting to optimize the product's damping characteristics. At the same time, it establishes a full-process, multi-dimensional quality inspection system, which not only further improves the absorption effect of engine vibration energy and improves the driving comfort of the car, but also comprehensively controls product quality and improves the finished product qualification rate and reliability. Attached Figure Description

[0014] Figure 1 This is a schematic flowchart of the processing method of the present invention; Figure 2 This is a schematic diagram of the finished engine hydraulic mount structure obtained by the present invention; Figure 3 This is a schematic diagram of the tilted structure of the engine hydraulic suspension finished product obtained by the present invention. Detailed Implementation

[0015] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0016] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0017] In the description of this application, the term "for example" is used to mean "used as an example, illustration, or description." Any embodiment described as "for example" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use the invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the invention can be made without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the invention with unnecessary detail. Therefore, the invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0018] like Figures 1-3 As shown, this embodiment provides a processing method for improving the production quality of engine hydraulic mounts, specifically including the following steps: Step 1: Rubber Formulation Optimization: Based on the high temperature, vibration frequency, and load characteristics that the engine hydraulic mount needs to withstand during use, a rubber base material with good heat resistance and excellent damping properties is selected as the main raw material. At the same time, reinforcing agents are added to improve the mechanical strength of the rubber, antioxidants are added to slow down the aging rate of the rubber, and plasticizers are added to improve the processing fluidity and elasticity of the rubber. Through multiple formulation adjustments and performance tests, the optimal raw material ratio is determined to ensure that the prepared rubber material can meet the working strength requirements during long-term use, maintain stable fatigue resistance and vibration damping effect, and maintain small changes in hardness and tensile strength after high-temperature aging. Step Two: Improvement and Processing of Inner Tube Structure Abandoning the traditional forged inner tube structure, this design adopts a combined "tube + washer" structure. The tube uses readily available standard-sized metal tubing, eliminating the need for specialized molds and significantly reducing raw material costs and delivery time. The washer is made from sheet metal using a stamping process. Its shape, thickness, and bore diameter can be flexibly adjusted according to the inner tube's dimensions and mechanical requirements, adapting to the production needs of different engine hydraulic mount models. During processing, the tube and washer are first interference-fitted at preset positions, using the tightness of the interference fit for initial fixation and ensuring a stable connection. Welding is then used to reinforce the riveted area, forming a unified whole. Mechanical performance testing verifies that the tensile strength, torsional strength, and other indicators of this combined structure fully meet product design requirements, while effectively lowering the production threshold and adapting to different batch production needs. Step 3: Comprehensive Surface Treatment of Parts: After the parts are machined, they are first degreased using solvent cleaning or ultrasonic cleaning to remove residual oil, cutting fluid, and other impurities from the surface, preventing these impurities from affecting subsequent adhesive application and vulcanization. Next, sandblasting is performed, using high-pressure abrasive to grind the surface, removing oxide layers and burrs, increasing surface roughness, and improving the adhesion of subsequent adhesives. For the mandrel holes, after cleaning and drying, a lubricating rust-preventive oil is evenly applied into the holes. This oil forms a dense protective film on the hole walls, effectively isolating moisture and impurities from the air, preventing rust in the screw holes during long-term use, and avoiding screw loosening or part failure due to corrosion. Before the riveting process, a high-viscosity silicone oil is evenly applied to the riveting contact surfaces. The silicone oil not only lubricates, reducing frictional resistance during riveting and protecting the surface from scratches, but also optimizes the assembly performance of the parts, reduces damping, and lays the foundation for improved shock absorption in subsequent processes. Step Four: Rubber Vulcanization Molding and Bushing Assembly: Preparation before assembling the optimized rubber material with the surface-treated inner and outer tubular metal parts: First, apply a special adhesive to the surface of the metal parts. This adhesive enhances the bonding strength between the rubber and the metal parts, preventing separation during later use. Then, place the metal parts and rubber material into the vulcanization mold according to the preset structure and perform vulcanization using a compression molding process. During vulcanization, the temperature, pressure, and time are precisely controlled through a real-time temperature and pressure monitoring system of the vulcanization equipment: excessively high temperatures can lead to rubber aging and deterioration, while excessively low temperatures result in insufficient vulcanization; insufficient pressure can cause air bubbles inside the rubber, while excessive pressure may cause part deformation; too short a vulcanization time will result in incomplete vulcanization, while too long a time will affect production efficiency. After vulcanization, the bushing semi-finished product is trimmed to remove excess rubber flash, ensuring a clean appearance and dimensions that meet design requirements. Step 5: Automated Riveting and Liquid Filling: An automated riveting system replaces the traditional manual edge-rolling process. Equipped with pressure and displacement sensors, this system collects pressure and displacement data in real time during the riveting process and transmits the data to the control system. The control system adjusts the equipment's operating status in real time based on preset riveting parameters, ensuring precise and consistent riveting force and displacement for each part. This avoids issues of excessively loose or tight riveting due to human error, significantly improving assembly reliability. After riveting, an automated filling system fills the product with a modified damping liquid. This liquid, with its optimized component ratios, improves flowability and damping characteristics, better absorbing engine vibration energy. Immediately after filling, a special sealant is used to seal the filling port, and a pressing process ensures a secure seal, preventing leakage during use. Step Six: Full-Process Quality Inspection and Packaging: Establish a full-process quality inspection system to conduct multi-dimensional testing on finished products: First, appearance inspection, using manual visual inspection or machine vision to check for defects such as insufficient glue, bubbles, rotten parts, under-vulcanization, and burrs on the product surface to ensure appearance compliance; Second, sealing test, using pressure testing or vacuum testing to apply a certain pressure or create a vacuum inside the product and observe the pressure or vacuum changes to determine if there is any liquid leakage; Third, mechanical performance testing, using specialized testing equipment to test the product's torsional torque and rubber tensile strength to ensure the product meets mechanical design requirements; Fourth, vibration damping performance testing, installing the product on a specialized vibration damping test bench to simulate the vibration environment of an engine during operation and test the product's vibration damping effect to ensure it meets preset performance indicators; Products that pass all tests are first cleaned to remove residual test media and impurities from the surface, then dried to prevent moisture residue from causing corrosion of parts; Finally, they are packaged using anti-collision packaging to avoid damage caused by collisions and compression during transportation and storage, ensuring the product is delivered to the customer intact.

[0019] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0020] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0021] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0022] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0023] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0024] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0025] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A processing method for improving the production quality of engine hydraulic mounts, characterized in that, Includes the following steps: Step 1: Rubber formulation optimization: Based on the working conditions of the engine hydraulic mount, select rubber raw materials with suitable heat resistance, damping characteristics and mechanical properties. By adjusting the raw material ratio and adding functional additives, prepare rubber materials that meet the long-term strength and fatigue resistance of the product. Step 2: Improvement and processing of inner tube structure: The bushing of the engine hydraulic mount consists of inner and outer tubular metal parts. A rubber barrier layer is set between the two tubular metal parts to achieve radial vibration reduction. The inner tube adopts a combination structure of tube and gasket. First, the tube and gasket are fixed by interference riveting. Then, the connection is strengthened by welding process to form an inner tube assembly that meets the mechanical design requirements of the product. Step 3: Comprehensive surface treatment of parts: The processed parts are degreased and sandblasted to remove surface impurities and oxide layers; then rust-preventive oil is applied to the inside of the mandrel hole to improve the corrosion resistance of the screw hole area; before the riveting process, silicone oil is applied to the riveting contact surface to optimize the assembly performance of the parts. Step 4: Rubber vulcanization molding and bushing assembly: The optimized rubber material and the pre-treated inner and outer tubular metal parts are coated with adhesive and vulcanized to firmly bond the rubber and metal parts to form a bushing semi-finished product; the vulcanization temperature, pressure and time parameters are controlled during the vulcanization process to ensure that the rubber is fully vulcanized and to avoid defects such as insufficient rubber, air bubbles and under-vulcanization. Step 5: Automated riveting and liquid filling: Automated riveting equipment is used to press the bushing semi-finished product and other components. By precisely controlling the pressing force and displacement parameters, the connection of the components is ensured to be firm. After pressing, the modified formula of shock-absorbing liquid is filled into the product. At the same time, the filling port is sealed to prevent liquid leakage. Step Six: Full-process quality inspection and packaging: The finished product after press-filling and filling is subjected to appearance inspection, sealing inspection, mechanical property testing and shock absorption performance testing; After cleaning and drying qualified products, they are packaged using shockproof packaging to complete the production process.

2. The processing method for improving the production quality of engine hydraulic mounts according to claim 1, characterized in that, In step one, the rubber raw material includes a heat-resistant rubber base material and functional additives, wherein the functional additives include reinforcing agents, antioxidants and plasticizers.

3. The processing method for improving the production quality of engine hydraulic mounts according to claim 1, characterized in that, In step two, the pipe material is a standard specification metal pipe, which is obtained through conventional procurement channels; the gasket is made of metal sheet through a stamping process, and the shape and thickness of the gasket are adjusted according to the inner tube size requirements.

4. The processing method for improving the production quality of engine hydraulic mounts according to claim 1, characterized in that, In step three, the rust-preventive oil is a lubricating rust-preventive oil with good adhesion and durable rust prevention, and the silicone oil is a high-viscosity silicone oil that meets food-grade or industrial-grade standards.

5. The processing method for improving the production quality of engine hydraulic mounts according to claim 1, characterized in that, In step four, the vulcanization process adopts compression vulcanization, and the vulcanization equipment is equipped with a real-time temperature and pressure monitoring system to ensure stable vulcanization process parameters.

6. The processing method for improving the production quality of engine hydraulic mounts according to claim 1, characterized in that, In step five, the damping liquid is a composite liquid with a modified formula, and the automated riveting equipment is equipped with pressure sensors and displacement sensors to provide real-time feedback on the pressing status and automatically adjust parameters.

7. The processing method for improving the production quality of engine hydraulic mounts according to claim 1, characterized in that, In step six, the sealing performance test is conducted using a pressure test or a vacuum test, the mechanical performance test includes torsional torque test and rubber tensile strength test, and the shock absorption performance test is completed using a dedicated shock absorption test equipment.

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