Cam piece induction heating press-fitting equipment

Abstract

The utility model provides cam sheet induction heating press-fitting equipment, belongs to the technical field of cam sheet installation, and solves the problems that an existing resistance furnace is low in heat efficiency and needs to transfer cam sheets more troublesomely. The device comprises a workbench, a pressure-bearing assembly is arranged on the workbench and comprises a pressure-bearing cylinder, a through hole is vertically formed in the pressure-bearing cylinder, an avoiding through groove is formed in the side wall of the pressure-bearing cylinder, an induction heating copper pipe is movably arranged in the through hole, the induction heating copper pipe is connected with an induction heating system, and the induction heating system is connected with a lifting mechanism. A support is arranged on the workbench, and a pressing device is arranged on the workbench. The cam piece is placed on the pressure bearing cylinder, the induction heating copper pipe ascends to conduct induction heating on an inner hole of the cam piece, heat efficiency is improved, and energy consumption is reduced. And the induction heating copper pipe is controlled to descend, and the pressing device presses the shaft rod into the cam piece, so that the cam piece is immediately pressed after being heated, the operation is simple, the cam piece does not need to be manually transferred, and the safety risk is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of cam plate installation technology, specifically to a cam plate induction heating press-fitting device. Background Technology

[0002] As a core component of an internal combustion engine, the camshaft's performance directly determines the engine's overall performance and service life. During camshaft assembly, heating the cam plates is a crucial step in achieving an interference fit with the shaft.

[0003] Currently, the industry commonly uses resistance furnaces to heat cam plates. However, resistance furnaces suffer from significant energy loss and low thermal efficiency. Furthermore, after heating in the resistance furnace, the cam plates need to be removed from the furnace and placed on a pressing device for pressing, which is quite troublesome and poses a safety risk of the cam plates falling off. Utility Model Content

[0004] To address the aforementioned problems, the purpose of this utility model is to provide a cam plate induction heating press-fitting device. The cam plate is placed on a pressure cylinder, and the inner hole of the cam plate is induction heated by the rising induction heating copper tube, thereby improving thermal efficiency and reducing energy consumption. The device controls the descent of the induction heating copper tube and the pressing device to press the shaft into the cam plate, thus enabling the pressing operation to be performed immediately after the cam plate is heated. The operation is simple and does not require manual transfer of the cam plate, reducing safety risks.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A cam plate induction heating pressing device includes a worktable. A pressure-bearing assembly for placing cam plates is provided on the worktable. The pressure-bearing assembly includes a pressure-bearing cylinder with a vertically formed through-hole. A clearance groove communicating with the through-hole is formed on the side wall of the pressure-bearing cylinder. An induction heating copper tube is movably disposed in the through-hole. The induction heating copper tube extends from the clearance groove and is connected to an induction heating system. The induction heating system is connected to a lifting mechanism. A bracket for vertically placing a shaft above the pressure-bearing assembly is provided on the worktable. The bracket can move as the shaft moves vertically. A pressing device located above the bracket and used to press the shaft is provided on the worktable.

[0007] Preferably, the upper end face of the pressure-bearing cylinder is provided with a groove that matches the cam plate.

[0008] Preferably, a water tank is provided on the workbench, and a water pump is provided in the water tank. The induction heating copper pipe is connected to two hoses, one of which is connected to the water pump and the other is connected to the water tank.

[0009] Preferably, the bracket includes a column, a slide rail is vertically mounted on the column, a slide seat is slidably mounted on the slide rail, a connecting plate is mounted on the slide seat, a first U-shaped frame is mounted on the connecting plate, and an arc-shaped slot is mounted on the first U-shaped frame.

[0010] Preferably, the first U-shaped frame is provided with a positioning groove.

[0011] Preferably, the column is connected to a support plate, and a spring is connected to the upper surface of the support plate, with the upper end of the spring abutting against the bottom of the connecting plate.

[0012] Preferably, the support plate is threaded onto the column.

[0013] Preferably, the connecting plate is provided with a second U-shaped frame, and at least two guide wheels are rotatably connected to the second U-shaped frame.

[0014] Preferably, the workbench is equipped with an infrared thermometer aligned with the cam plate.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0016] The cam plate is placed on the pressure cylinder, and the inner hole of the cam plate is induction heated by the rising induction heating copper tube, which improves thermal efficiency and reduces energy consumption. The descent of the induction heating copper tube and the pressing device are controlled to press the shaft into the cam plate, so that the pressing operation can be performed immediately after the cam plate is heated. The operation is simple and there is no need to manually transfer the cam plate, which reduces safety risks. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A three-dimensional structural schematic diagram provided for an embodiment of this utility model;

[0019] Figure 2 A schematic diagram of the support structure provided for an embodiment of this utility model;

[0020] Figure 3 This is a schematic diagram of the pressure-bearing component structure provided in an embodiment of the present utility model.

[0021] Reference numerals: 1-Workbench; 2-Pressure-bearing component; 201-Pressure-bearing cylinder; 202-Induction heating copper tube; 203-Avoidance slot; 204-Slot; 205-Through hole; 3-Shaft; 301-Baffle; 302-Hexagonal protrusion; 4-Bracket; 401-Column; 402-Sliding seat; 403-Slide rail; 404-Connecting plate; 405-Spring; 406-Support plate; 407-First U-shaped frame; 408-Arc-shaped slot; 409-Positioning slot; 410-Second U-shaped frame; 411-Guide wheel; 5-Infrared thermometer; 6-Pressing device; 7-Water tank; 8-Hose; 9-Induction heating system; 10-Lifting mechanism; 11-Mounting plate; 12-Cam plate. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] In the description of this utility model, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" appear to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] The following is combined Figures 1-3 This utility model will be described in detail.

[0026] Example

[0027] A cam plate induction heating pressing device includes a worktable 1. The worktable 1 is provided with a pressure-bearing component 2 for placing a cam plate 12. The pressure-bearing component 2 includes a pressure-bearing cylinder 201. A through hole 205 is vertically opened in the pressure-bearing cylinder 201. An avoidance groove 203 communicating with the through hole 205 is opened on the side wall of the pressure-bearing cylinder 201. An induction heating copper tube 202 is movably arranged in the through hole 205. The induction heating copper tube 202 extends from the avoidance groove 203 and is connected to an induction heating system 9. The induction heating system 9 is connected to a lifting mechanism 10. A bracket 4 is provided on the worktable 1 for vertically placing a shaft 3 above the pressure-bearing component 2. The bracket 4 can move with the vertical movement of the shaft 3. A pressing device 6 is provided on the worktable 1 above the bracket 4 for pressing the shaft 3.

[0028] The pressure-bearing component 2 and the bracket 4 are fixed on the same mounting plate 11, facilitating simultaneous installation of the pressure-bearing component 2 and the bracket 4. The induction heating copper tube 202 includes a horizontal section and a spirally wound vertical section. The vertical section can freely rise and fall within the through hole 205. After the lifting mechanism 10 drives the induction heating system 9 to rise and fall, the induction heating system 9, through the horizontal section of the induction heating copper tube 202, drives the vertical section of the induction heating copper tube 202 to rise and fall together, thereby achieving induction heating and avoiding the shaft 3, facilitating the insertion of the shaft 3 into the cam plate 12. The lifting mechanism 10 can be a hydraulic telescopic rod or a screw lifting mechanism.

[0029] The cam plate 12 is placed on the pressure cylinder 201. The lifting mechanism 10 drives the induction heating system 9 and the induction heating copper tube 202 to rise together. The vertical section of the induction heating copper tube 202 extends into the inner hole of the cam plate 12 to perform induction heating. After heating is completed, the lifting mechanism 10 drives the induction heating copper tube 202 to descend. The pressing device 6 then presses the shaft 3 to make the cam plate 12 fit on the shaft 3, thus completing the pressing operation of the cam plate 12.

[0030] The pressing device 6 employs a servo press, which uses a direct-drive servo motor (15kW power, control accuracy ±0.01mm) driven by a ball screw. The maximum pressing force can reach 50kN, and the pressing speed can be steplessly adjusted within the range of 0.1-10mm / s. The pressing device 6 is equipped with a displacement sensor, with displacement accuracy controllable within ±0.01mm, monitoring the displacement in real time. A control system can be set to link with the pressing device 6, automatically retracting when the pressing position is reached. The pressing device 6 is also equipped with a pressure sensor (accuracy ±0.5%FS), monitoring the pressing force data in real time. A control system can be set to link with the pressing device 6, automatically stopping when the pressure exceeds a set threshold (e.g., 90% of the maximum pressing force, i.e., 45kN). When the pressing position of the pressing device 6 reaches the preset value and the pressing force is within the preset range, it indicates that the cam plate 12 and the shaft 3 are properly interference-fitted; otherwise, it is unqualified. Unqualified operation is indicated by a red alarm indicator light to alert the operator.

[0031] The upper end face of the pressure-bearing cylinder 201 is provided with a groove 204 that matches the cam plate 12. The groove 204 can position the cam plate 12 so that the cam plate 12 is aligned with the shaft 3 for press-fitting.

[0032] A water tank 7 is installed on the workbench 1, and a water pump is installed in the water tank 7. The induction heating copper tube 202 is connected to two hoses 8. One hose 8 is connected to the water pump, and the other hose 8 is connected to the water tank 7. The water pump delivers cooling water to the induction heating copper tube 202 through the hose 8, and then discharges it into the water tank 7 through the other hose 8, thereby circulating and cooling the induction heating copper tube 202 to avoid the risk of overheating and melting or dry burning.

[0033] The support 4 includes a column 401, a vertically mounted slide rail 403, a slidably mounted slide seat 402 on the slide rail 403, a connecting plate 404 on the slide seat 402, a first U-shaped frame 407 on the connecting plate 404, and an arc-shaped groove 408 on the first U-shaped frame 407. A baffle 301 is mounted on the shaft 3. After the shaft 3 is engaged in the arc-shaped groove 408, the baffle 301 can be placed on the first U-shaped frame 407 to prevent the shaft 3 from moving downwards relative to the first U-shaped frame 407. When the pressing device 6 performs the pressing, the pressing device 6 presses down on the shaft 3 and forces the connecting plate 404 and the first U-shaped frame 407 to move downwards together with the shaft 3. The first U-shaped frame 407 supports the shaft 3 to ensure that the shaft 3 can move downwards stably.

[0034] The shaft 3 is provided with a hexagonal protrusion 302, and the first U-shaped frame 407 is provided with a positioning groove 409. The hexagonal protrusion 302 can be inserted into the positioning groove 409 to prevent the shaft 3 from rotating circumferentially. At the same time, it can also position the shaft 3 so that the shaft 3 and the cam plate 12 are in a relatively accurate position for press-fitting.

[0035] The column 401 is connected to a support plate 406, and a spring 405 is connected to the upper surface of the support plate 406. The upper end of the spring 405 abuts against the bottom of the connecting plate 404. The spring 405 is compressed after the shaft 3 and the connecting plate 404 are pressed down. After the pressing is completed, the pressing device 6 is reset, and the spring 405 resets the connecting plate 404. The first U-shaped frame 407, together with the baffle 301, lifts the pressed shaft 3, which facilitates the removal of the part. At the same time, it can also maintain a certain distance between the lower end of the next placed shaft 3 and the cam plate 12 to avoid affecting the heating of the induction heating copper tube 202.

[0036] The support plate 406 is threaded onto the column 401. The support plate 406 can adjust the pre-compression of the spring 405, thereby adjusting the elastic force of the spring 405 and the displacement limit of the connecting plate 404 as needed. The compression of the spring 405 can be adjusted from 5mm to 15mm.

[0037] A second U-shaped frame 410 is provided on the connecting plate 404, and at least two guide wheels 411 are rotatably connected to the second U-shaped frame 410. The two guide wheels 411 can provide auxiliary support for the shaft 3 and simultaneously perform centering of the shaft 3. The guide wheels 411 are acetal guide wheels. Acetal is a polyoxymethylene resin plastic, so the hardness of the guide wheels 411 is less than that of the shaft 3, which can prevent the shaft 3 from being damaged by impact.

[0038] An infrared thermometer 5 is installed on the workbench 1, aligned with the cam plate 12. The infrared thermometer 5 can detect the heating temperature of the cam plate 12, with a detection accuracy of ±1℃, meeting the requirements of precision heat treatment and high-precision assembly. It can also flexibly set the heating rate according to different heating process requirements, adapting to complex processes. Once the temperature reaches the set value, it can alert the operator to perform the pressing operation. Alternatively, it can be configured with an automated control program and related control system to automatically control the induction heating system 9 to stop working and drive the lifting mechanism 10 to descend and the pressing device 6 to rise and fall.

[0039] Existing resistance furnace heating methods have the following disadvantages:

[0040] 1. Severe energy loss and low thermal efficiency: Resistance furnaces use resistance wires made of iron-chromium-aluminum or nickel-chromium alloys for heating, and approximately 20%-30% of the electrical energy is lost in the form of visible light or infrared radiation. For open resistance furnaces (such as box furnaces), heat loss from the furnace door and walls accounts for over 40% of the total energy consumption, and the actual thermal efficiency is usually below 50%, more than 30% lower than that of electromagnetic induction heating. The resistance wires exhibit significant thermal inertia, resulting in slow heating / cooling rates. After reaching the set temperature, residual heat continues to transfer, leading to overshoot and causing 15%-20% energy waste.

[0041] 2. Uneven heat distribution and prominent edge effect: The resistance wires are mostly arranged in a winding or flat manner on both sides or bottom of the furnace wall, resulting in the temperature in the central area of ​​the furnace being 50-100℃ higher than that at the edge. If the temperature field of the heating area is uneven (e.g., the temperature difference between the edge and the center is >50℃), the pressing part of the cam plate 12 (shaft hole, flange) will be distorted due to inconsistent thermal expansion: ① Uneven heating of the shaft hole will cause local expansion of the hole wall, resulting in ellipticity exceeding the tolerance (standard requirement ≤0.02mm). After pressing, the interference between the shaft and the hole will deviate from the design value (design interference 0.03-0.05mm, actual interference may drop to 0.01mm or rise to 0.07mm). ② Uneven heating of the flange plane will cause warping deformation (flatness requirement ≤0.05mm). Uneven force during pressing will cause local stress concentration, affecting the coaxiality of the assembly (requirement ≤0.01mm).

[0042] 3. High-temperature surfaces and fire hazards: The surface temperature of the resistance furnace shell can reach 100-200℃ (without optimized insulation layer). Contact with flammable materials such as oil and cloth can easily cause a fire. When the furnace wires are exposed or the insulation layer is aged, there may be a risk of leakage in a humid environment. If a workpiece falls into the furnace or the furnace is run without load, the resistance wire may melt due to overheating (the melting point of nickel-chromium wire is about 1400℃, and it is prone to oxidation and breakage if it is continuously dry-burned), or even cause a short circuit.

[0043] 4. Electromagnetic radiation and thermal pollution: When the resistance wire is heated at high frequency (such as in a high-frequency resistance furnace), it will generate low-frequency electromagnetic radiation of 10-100kHz. Long-term exposure may have potential health effects on operators. At the same time, the heat dissipation of the furnace body can cause the workshop temperature to rise by 5-10℃ in summer, increasing the energy consumption of air conditioning.

[0044] Advantages of this application: ① This application adopts induction heating technology, directly converting electrical energy into heat energy applied to the workpiece, avoiding energy loss and heat radiation dissipation caused by the heating of the resistance wire in an electric resistance furnace. The thermal efficiency can reach over 80%, which is more than 30% higher than that of traditional electric resistance furnaces, significantly reducing energy consumption. ② The cam plate is heated evenly in all parts, effectively avoiding out-of-tolerance ovality of the shaft hole and flange warping deformation, ensuring dimensional and shape accuracy of the press-fit parts, and improving assembly coaxiality. ③ The induction heating process is flameless, dust-free, produces no harmful gas emissions, and emits no electromagnetic radiation, reducing environmental pollution. Circulating water cooling further reduces thermal pollution and improves the working environment.

[0045] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

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