Device and method for press fitting and depth measurement of engine cylinder sleeve

Abstract

The invention discloses a device and method for press fitting and depth measurement of an engine cylinder liner, and the device comprises a pressure head lifting sliding seat and a pressure head which are coaxially arranged, the pressure head lifting sliding seat and the pressure head are provided with a spherical bearing assembly which is coaxially arranged, and the pressure head is provided with a measuring head which extends along the axial direction of the pressure head. The problems of press fitting coaxiality deviation and press fitting disqualification are effectively solved, the machining and manufacturing difficulty is reduced, and the press fitting quality and the qualification rate are greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of engine cylinder liner press-fitting, and in particular discloses a device and method for engine cylinder liner press-fitting and depth measurement. Background Art

[0002] In the production and assembly process of the engine, the cylinder liner is a key component, and its press-fitting quality is directly related to the performance and reliability of the engine. At present, the traditional cylinder liner press-fitting and measurement process generally has problems such as decentralized process, complex equipment and high cost. Usually, the press-fitting and measurement stations of the cylinder liner are separated. Although this independent division of labor can improve the operating efficiency to a certain extent, it also has obvious disadvantages: it is necessary to add two independent sets of online automation equipment, which not only occupies more production space, but also increases the number of equipment beds, pallet lifting and positioning systems and electronic control systems, resulting in a significant increase in manufacturing costs. In addition, the complexity of equipment maintenance and debugging also increases, which is not conducive to the optimization of factory production efficiency.

[0003] On the other hand, the press head design of traditional cylinder liner press-fitting equipment usually adopts a rigid structure, which places extremely high demands on the coaxiality between the press head and the cylinder liner. However, due to slight errors in the processing and assembly process, it is difficult for the coaxiality to fully meet the requirements during press-fitting, which leads to the problem of unstable press-fitting quality. The press-fitting qualification rate of such equipment is often difficult to meet the factory standard, resulting in a high frequency of rework, which not only increases production costs, but also affects the stability of production cycle and product quality.

[0004] In order to solve the above problems, there is an urgent need for an equipment design scheme that can effectively integrate the cylinder liner pressing and measurement functions and improve the coaxiality adaptability of the pressing process to meet the needs of efficient, stable and economical cylinder liner pressing. Summary of the invention

[0005] The purpose of the present invention is to provide a device and method for press-fitting and depth measurement of engine cylinder liners, which effectively solves the problems of press-fitting coaxiality deviation and press-fitting failure, reduces the difficulty of processing and manufacturing, and greatly improves the press-fitting quality and pass rate.

[0006] To achieve the above-mentioned purpose, the present invention discloses a device for pressing and measuring the depth of an engine cylinder liner, comprising a coaxially arranged pressure head lifting slide and a pressure head, wherein the pressure head lifting slide and the pressure head are provided with a coaxially arranged spherical bearing assembly, and the pressure head is provided with a measuring head extending along its axial direction.

[0007] In a preferred embodiment of the present invention, the spherical bearing assembly includes a spherical bearing upper mounting seat and a spherical bearing lower mounting seat, the spherical bearing upper mounting seat and the spherical bearing lower mounting seat are connected by a tie rod bolt, and a spherical bearing coaxially arranged with the pressure head is arranged between the spherical bearing upper mounting seat and the spherical bearing lower mounting seat.

[0008] In a preferred embodiment of the present invention, the spherical bearing lower mounting seat has a mounting groove for mounting the spherical bearing.

[0009] In a preferred embodiment of the present invention, a rubber pad is provided between the spherical bearing upper mounting seat and the spherical bearing lower mounting seat.

[0010] In a preferred embodiment of the present invention, the rubber pad is sleeved onto the pull rod bolt.

[0011] In a preferred embodiment of the present invention, the pull rod bolts are arranged at equal intervals along the circumference of the lower mounting seat of the spherical bearing.

[0012] In a preferred embodiment of the present invention, the mounting seat on the spherical bearing is connected to a pressure head quick-change plate, and the pressure head quick-change plate is detachably connected to the pressure head lifting slide.

[0013] In a preferred embodiment of the present invention, the pressure head is provided with a plurality of measuring heads spaced apart along its circumference.

[0014] In a preferred embodiment of the present invention, the measuring head can be raised and lowered along the axial direction of the pressure head.

[0015] The present invention also discloses a method for using a device for press-fitting and depth measurement of an engine cylinder liner, wherein the engine cylinder liner is transported to a press-fitting station; the engine cylinder liner is press-fitted into place using the device for press-fitting and depth measurement of the engine cylinder liner; after the engine cylinder liner is press-fitted into place, a probe is extended to measure the upper surfaces of the cylinder block and the cylinder liner, and a protrusion value of the upper end face of the cylinder liner relative to the upper end face of the cylinder block is measured, and the measured data is compared with a standard value of the cylinder liner protrusion required by the process to determine whether the press-fitting is qualified.

[0016] The beneficial effects of the present invention are as follows: the present invention effectively solves the technical problems of dispersed workstations, high equipment costs and difficulty in ensuring pressing accuracy in traditional technologies, and has significant advantages such as compact structure, stable performance, low cost and easy operation, and is suitable for large-scale production needs in the field of engine manufacturing.

[0017] First, the present invention integrates the press-fitting function and the depth measurement function of the cylinder liner in the same device. Through the coaxial arrangement of the press head lifting slide and the press head, and the application of the spherical bearing assembly, the coaxiality of the press head and the cylinder liner during the press-fitting process is ensured. This design not only improves the accuracy of press-fitting, significantly reduces the quality problems caused by insufficient coaxiality, but also reduces the frequency of rework and improves production efficiency.

[0018] Secondly, the introduction of the spherical bearing assembly gives the press head a certain degree of adjustment ability, which can adapt to small errors in the processing and assembly process, thereby further improving the stability and reliability of the press-fitting process. Through the design of the upper and lower mounting seats of the spherical bearing, combined with the buffering effect of the rubber pad, the mechanical stress that may be generated during the press-fitting process is effectively reduced, extending the service life of the equipment.

[0019] In addition, the present invention also provides a measuring head extending along the axial direction on the pressure head, so that the press-fitting and depth measurement of the cylinder liner can be completed at the same station. Compared with the design of the traditional separate stations, the present invention not only saves production space and reduces the equipment investment cost, but also simplifies the process flow, reduces the manual operation links, and improves the automation level of the production line. The measuring head measures the protrusion value of the upper end face of the cylinder liner relative to the upper end face of the cylinder body in real time, which can quickly determine whether the press-fitting quality is qualified, thereby improving the accuracy and efficiency of the detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of a device for press-fitting and depth measurement of an engine cylinder liner according to the present invention;

[0021] Figure 2 A three-dimensional schematic diagram of a device for press-fitting and depth measurement of an engine cylinder liner according to the present invention;

[0022] Figure 3 The present invention is a schematic diagram of the use status of a device for press-fitting and depth measurement of an engine cylinder liner. DETAILED DESCRIPTION

[0023] The technical solution of the present invention (including the preferred technical solution) is further described in detail below by means of the accompanying drawings and by listing some optional embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] The present invention provides a device for press-fitting and depth measurement of engine cylinder liners, which innovatively integrates press-fitting and measurement functions, significantly improving production efficiency and reducing production costs. The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings.

[0025] The core innovation of the present invention lies in its unique structural design. The main body of the device is composed of a coaxially arranged pressure head lifting slide 1 and a pressure head 6, and a carefully designed spherical bearing assembly is arranged between the two. The design of the spherical bearing assembly ensures flexibility and accuracy during the press-fitting process. A measuring head 9 is arranged on the pressure head 6 along the axial extension. This integrated design allows press-fitting and measurement to be completed at the same station.

[0026] The structural design of the spherical bearing assembly embodies the technical innovation of the present invention. The assembly mainly includes two key components, the spherical bearing upper mounting seat 3 and the spherical bearing lower mounting seat 5, which are tightly connected by a tie rod bolt 4. Between the upper and lower mounting seats, a spherical bearing 8 is arranged coaxially with the pressure head 6. This design not only ensures the coaxiality during the press-fitting process, but also provides the necessary floating space, effectively solving the deviation problem in the traditional press-fitting process.

[0027] In terms of structural details, a mounting groove for mounting a spherical bearing 8 is specially designed on the spherical bearing lower mounting seat 5. In order to improve the stability and buffering performance of the assembly, a rubber pad 7 is added between the spherical bearing upper mounting seat 3 and the spherical bearing lower mounting seat 5. This rubber pad 7 is fixed to the pull rod bolt 4 in a set manner, which not only ensures the reliability of the installation, but also provides the necessary elastic buffer.

[0028] The arrangement of the tie rod bolts 4 has also been carefully designed, and is arranged at equal intervals along the circumference of the spherical bearing lower mounting seat 5. This uniform arrangement ensures uniform force and improves the stability of the entire assembly. In terms of connection, the spherical bearing upper mounting seat 3 is connected to the pressure head quick-change plate 2, and the pressure head quick-change plate 2 is detachably connected to the pressure head lifting slide 1. This quick-change structural design greatly improves the maintenance efficiency and flexibility of the device.

[0029] The present invention is also innovative in the design of the measuring system. A plurality of measuring heads 9 are arranged at intervals along the circumference of the pressure head 6, and these measuring heads 9 can be raised and lowered along the axial direction of the pressure head 6. With this design, accurate measurement of the cylinder liner press-fitting depth can be achieved. The measuring head adopts a pneumatic telescopic measuring sensor, and its extension and retraction are controlled by a solenoid valve, ensuring the accuracy and reliability of the measurement.

[0030] In order to ensure the accuracy requirements of the device, the present invention has taken all-round accuracy assurance measures in the structural design. First, the coaxiality error between the pressure head lifting slide 1 and the pressure head 6 is strictly controlled within 0.01mm, and the mating surfaces of the spherical bearing assembly are precision machined, with a surface roughness of Ra≤0.8μm. The spherical bearing 8 uses a precision-grade bearing, and its radial clearance is controlled within the range of 0.005-0.015mm. The mating surfaces of the upper and lower mounting seats of the spherical bearing are ground, and the flatness is controlled within 0.005mm.

[0031] In terms of measuring system accuracy, the measuring head 9 uses a high-precision pneumatic probe, which can achieve a measurement accuracy of ±0.001mm. The mounting hole of the measuring head adopts a precision boring process to ensure the verticality of the measuring head. The design of evenly arranging 6 measuring points around the pressure head effectively improves the reliability of the measurement. The measurement data acquisition system uses 16-bit A / D conversion to further ensure the accuracy of data acquisition.

[0032] The present invention also pays special attention to the guarantee of motion control accuracy. The pressure head is driven by a servo motor, and the position accuracy is controlled within ±0.02mm. The pressing force is monitored in real time by a pressure sensor with an accuracy of ±1%. The pressing speed is controlled by a closed loop servo system to ensure the stability of the pressing process. At the same time, the pallet is positioned with a high-precision positioning pin, and the repeated positioning accuracy does not exceed 0.02mm. The positioning surface between the workpiece and the pallet is precisely machined to ensure the accuracy of the assembly reference.

[0033] In actual application, the workflow of the present invention is scientific and reasonable. First, the engine cylinder liner is transported to the press-fitting station, and then accurately press-fitted by the device. After the press-fitting is completed, the measuring head automatically extends to measure the upper surface of the cylinder body and the cylinder liner at the same time, and obtains the protrusion value of the upper end surface of the cylinder liner relative to the upper end surface of the cylinder body. These measurement data will be automatically compared with the preset process standard values ​​to determine whether the press-fitting is qualified.

[0034] In order to ensure the long-term stable operation of the device, the present invention has established a complete quality monitoring system. Through the complete measurement data traceability system and early warning mechanism, abnormal situations can be discovered in time. At the same time, the equipment installation environment temperature is strictly controlled at 20±2℃, and the equipment foundation adopts a vibration reduction design to effectively reduce the impact of environmental factors. Through these measures, the present device can achieve the high-precision requirements of cylinder liner press-fitting coaxiality ≤0.05mm, cylinder liner end face protrusion measurement accuracy ≤0.01mm, press-fitting force control accuracy ≤1%, and system repeat positioning accuracy ≤0.02mm.

[0035] The present invention effectively solves the coaxiality deviation problem in the traditional press-fitting process through innovative structural design and scientific workflow, and significantly improves the press-fitting quality and qualified rate. At the same time, the integrated design of press-fitting and measuring functions greatly improves production efficiency and reduces production costs. In particular, the design of the spherical bearing assembly, through the cooperation of the tie rod bolt and the rubber pad, enables the lower mounting seat of the spherical bearing to obtain the necessary floating capacity, ensuring that the pressure head can float slightly in any direction during press-fitting, fundamentally solving the coaxial deviation problem during press-fitting.

[0036] Those skilled in the art will readily appreciate that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, combinations, replacements, improvements, etc. made within the spirit and principles of the present invention are included within the protection scope of the present invention.

Claims

1. A device for press-fitting and depth measurement of an engine cylinder liner, comprising a coaxially arranged press head lifting slide (1) and a press head (6), characterized in that: The pressure head lifting slide (1) and the pressure head (6) are provided with a coaxially arranged spherical bearing assembly, and the pressure head (6) is provided with a measuring head (9) extending along its axial direction.

2. The device for press-fitting and depth measurement of engine cylinder liners according to claim 1, characterized in that: The spherical bearing assembly comprises a spherical bearing upper mounting seat (3) and a spherical bearing lower mounting seat (5), wherein the spherical bearing upper mounting seat (3) and the spherical bearing lower mounting seat (5) are connected via a tie rod bolt (4), and a spherical bearing (8) coaxially arranged with the pressure head (6) is provided between the spherical bearing upper mounting seat (3) and the spherical bearing lower mounting seat (5).

3. The device for press-fitting and depth measurement of engine cylinder liners according to claim 2, characterized in that: The spherical bearing lower mounting seat (5) has a mounting groove for mounting the spherical bearing (8).

4. The device for press-fitting and depth measurement of engine cylinder liners according to claim 2, characterized in that: A rubber pad (7) is provided between the spherical bearing upper mounting seat (3) and the spherical bearing lower mounting seat (5).

5. The device for press-fitting and depth measurement of engine cylinder liners according to claim 4, characterized in that: The rubber pad (7) is sleeved onto the pull rod bolt (4).

6. The device for press-fitting and depth measurement of engine cylinder liners according to claim 5, characterized in that: The tie rod bolts (4) are arranged at equal intervals along the circumference of the spherical bearing lower mounting seat (5).

7. The device for press-fitting and depth measurement of engine cylinder liners according to claim 1, characterized in that: The mounting seat (3) on the spherical bearing is connected to the pressure head quick-change plate (2), and the pressure head quick-change plate (2) is detachably connected to the pressure head lifting slide seat (1).

8. The device for press-fitting and depth measurement of engine cylinder liners according to claim 1, characterized in that: The pressure head (6) is provided with a plurality of measuring heads (9) arranged at intervals along its circumference.

9. The device for press-fitting and depth measurement of engine cylinder liners according to claim 8, characterized in that: The measuring head (9) can be raised and lowered along the axial direction of the pressure head (6).

10. A method for using the device for press-fitting and depth measurement of engine cylinder liners according to claims 1 to 9, characterized in that: The engine cylinder liner is transported to the press-fitting station; the engine cylinder liner is press-fitted into place based on the device for press-fitting and depth measurement of the engine cylinder liner; after the engine cylinder liner is press-fitted into place, the probe is extended to measure the upper surface of the cylinder block and the cylinder liner, and the protrusion value of the upper end surface of the cylinder liner relative to the upper end surface of the cylinder block is measured, and the measured data is compared with the standard value of the cylinder liner protrusion required by the process to determine whether the press-fitting is qualified.

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