Unmanned power camshaft idler shaft laser strengthening clamping device and laser strengthening method

Abstract

The present invention discloses a laser strengthening clamping device and strengthening method for an unmanned power camshaft idler shaft, which belongs to the technical field of mechanical processing, and includes a top plate and a top body arranged below the top plate, wherein the top plate is provided with a plurality of threaded countersunk holes and locating pin holes, and also includes a locating pin matched with the locating pin hole, and a top is arranged at the center above the top plate. The laser strengthening method for an unmanned power camshaft idler shaft uses an unmanned power camshaft idler shaft laser strengthening clamping device to clamp the idler shaft for laser strengthening. The present application adopts laser strengthening to replace surface induction hardening treatment, and solves the problems of hardening cracking, high product scrap rate, and high risk of hidden dangers in the induction hardening treatment of the camshaft idler shaft, and ensures the laser strengthening clamping requirements of the camshaft idler shaft, and meets the technical requirements of heat treatment strengthening of parts.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical processing, and in particular relates to an unmanned power camshaft idler shaft laser strengthening clamping device and a laser strengthening method. Background Art

[0002] The camshaft idler shaft is an important driving component of the outboard engine. The idler shaft cooperates with the camshaft intermediate gear through the idler bushing to transmit the torque of the crankshaft gear and the intake and exhaust camshaft gear and the spatial steering arrangement. It has a huge impact on the reliability, efficiency and service life of the engine. When the idler shaft is working, relative sliding friction is generated between it and the idler bushing. The shaft diameter surface is often in a state of boundary lubrication or mixed lubrication. Due to the thin and uneven thickness of the lubricating film formed, the idler shaft surface often has failure forms such as abrasions, pitting and rapid wear. In order to ensure that the engine performance, service life and emission indicators meet the regulations, in addition to requiring the idler shaft to have sufficient toughness and rigidity, it should also have good high hardness and wear resistance.

[0003] Figure 3 , 4 It is a schematic diagram of a camshaft idler shaft, which includes a cylindrical shaft body with a plurality of shaft holes provided on the shaft body, a hole in the center of the bottom end face of the shaft body, a center shaft provided on the upper end face of the shaft body, and a center hole extending deep into the shaft body provided in the center of the center shaft.

[0004] Camshaft idler shafts are generally made of medium carbon alloy steel, and heat treatment strengthening adopts overall quenching and surface induction hardening. Surface induction hardening is to induction harden the surface of the shaft diameter through an induction coil to improve the surface hardness and wear resistance. The camshaft idler shaft adopts surface induction hardening. The thinnest part of the hole wall position on the quenched shaft diameter surface is only 3.25mm, and the depth of the hardened layer is required to be 2.25mm. The main disadvantages of the induction quenching process are hardening cracking, high product scrap rate, and high risk of hidden dangers in use, which cannot meet the heat treatment strengthening requirements of the camshaft idler shaft. Summary of the invention

[0005] The purpose of the present invention is to provide an unmanned power camshaft idler shaft laser strengthening clamping device and laser strengthening method, which can perform laser strengthening treatment on the camshaft idler shaft, improve the surface hardness and wear resistance of the idler shaft, and provide a clamping device that can conveniently perform laser strengthening treatment on the idler shaft.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is: A laser-enhanced clamping device for an unmanned power camshaft idler shaft comprises a top plate and a top body arranged below the top plate. The top plate is provided with a plurality of threaded countersunk holes and locating pin holes, and also comprises locating pins matched with the locating pin holes. A top plate is arranged at the center above the top plate.

[0007] A further improvement of the technical solution of the present invention is that the top body is in the shape of an elongated strip, and the center axes of the top body and the top are located on the same straight line.

[0008] A further improvement of the technical solution of the present invention is that the top includes a top platform and an ejector pin arranged in the center of the top platform.

[0009] A further improvement of the technical solution of the present invention is that the two ends of the locating pin are transitionally matched with the locating pin hole and the axial hole of the idler shaft respectively, the locating pin hole and the axial hole of the idler shaft have the same aperture, and also include bolts for fixing the clamping device.

[0010] A laser strengthening method for an unmanned power camshaft idler shaft, using an unmanned power camshaft idler shaft laser strengthening clamping device, specifically comprising the following steps: Step A, cleaning the surface of the idler shaft, and evenly brushing the light-absorbing paint on the surface of the idler shaft; Step B, installing the top body of the laser-strengthened clamping device for the idler shaft into the machine tool chuck, and fixing it to the machine tool chuck through the threaded countersunk hole by connecting bolts; Step C, the locating pin is installed in a suitable locating pin hole, and the locating pin cooperates with the camshaft idler shaft hole for positioning; Step D, the center of the idler shaft laser strengthening clamping device and the pneumatic center on the machine tool are respectively pushed onto the center hole of the bottom surface of the processed camshaft idler shaft and the center hole of the top surface center shaft, and tightened; Step E, the laser melting equipment is turned on, the machine tool starts to rotate, and the laser beam of the laser processing system scans rapidly to heat the surface of the idler shaft to above the melting temperature; Step F: After the laser beam is scanned, the melted layer of the idler shaft undergoes self-cooling, solidification and crystallization.

[0011] A further improvement of the technical solution of the present invention is that the laser melting equipment includes a quenching CNC system, the quenching CNC system of the laser melting equipment controls the rotation and movement of the idler shaft, and the laser processing system uses a helium-neon laser for precise positioning and cooperates with a light guide system for laser strengthening processing.

[0012] A further improvement of the technical solution of the present invention is that the servo motor of the quenching numerical control system accurately controls the light guide system to move up and down to keep the defocus amount consistent.

[0013] A further improvement of the technical solution of the present invention is that the light-absorbing paint is a white silicon dioxide light-absorbing paint, which is diluted with alcohol at a ratio of 1:2.

[0014] The further improvement of the technical solution of the present invention is that the laser strengthening process parameters are: spot diameter of 5mm, laser output power of 1.6kW, defocusing amount of 120mm, scanning speed of 1.7m / min, and mechanical finishing allowance of 0.05-0.1mm.

[0015] The camshaft idler shaft strengthening treatment process is characterized in that the process flow includes the following steps: blanking, tempering, machining, laser strengthening, fine machining, and finished product warehousing; the laser strengthening adopts the above-mentioned unmanned power camshaft idler shaft laser strengthening method.

[0016] Due to the adoption of the above technical solution, the technical progress achieved by the present invention is: This application adopts laser strengthening instead of surface induction hardening treatment, which solves the problems of through-hardening cracking, high product scrap rate, and high risk of hidden dangers in the induction hardening treatment of the camshaft idler shaft, ensures the laser strengthening clamping requirements of the camshaft idler shaft, and meets the heat treatment strengthening technical requirements of the parts.

[0017] The laser strengthening clamping device of the present invention is adapted to the structure of the idler shaft and can fix the idler shaft on a machine tool, thereby realizing the use of laser strengthening technology for the camshaft idler shaft, ensuring the laser strengthening clamping requirements of the camshaft idler shaft, and meeting the heat treatment strengthening technical requirements of the parts.

[0018] The clamping device of the present invention has the advantages of accurate positioning, good versatility and a wide range of applications, and can be used for clamping other similar parts during the laser strengthening process, such as the reducer idler shaft, the camshaft timing idler shaft, the intermediate stacked gear shaft and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the laser enhanced clamping device of the present application; Figure 2 It is a schematic diagram of the camshaft idler shaft being tightened on the machine tool; Figure 3 It is a schematic diagram of the structure of the camshaft idler shaft; Figure 4 It is a top view of the camshaft idler shaft; Among them, 1. Center plate, 2. Center body, 3. Center, 4. Locating pin, 5. Threaded countersunk hole, 6. Locating pin hole, 7. Pneumatic center, 8. Machine tool chuck. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below in conjunction with embodiments: The camshaft idler shaft strengthening treatment process includes the following steps: blanking, tempering, machining, laser strengthening, fine machining, and finished product warehousing; the shaft diameter heat treatment strengthening method of the camshaft idler shaft adopts laser scanning strengthening treatment.

[0021] A laser strengthening method for an unmanned power camshaft idler shaft comprises the following steps: Step A, cleaning the surface of the idler shaft, and evenly brushing the light-absorbing paint on the surface of the idler shaft; Step B, install the top body 2 of the idler shaft laser strengthening clamping device into the machine tool chuck 8, and fix it to the machine tool chuck 8 through the threaded countersunk hole 5 by connecting bolts; Step C, the positioning pin 4 is installed in a suitable positioning pin hole 6, and the positioning pin 4 cooperates with the camshaft idler shaft hole for positioning; Step D, the tip 3 of the laser strengthening clamping device for the idler shaft and the pneumatic tip 7 on the machine tool are respectively pressed against the center hole of the bottom surface of the processed camshaft idler shaft and the center hole of the top surface center shaft, and tightened; Step E, the laser melting equipment is turned on, the machine tool starts to rotate, and the laser beam of the laser processing system scans rapidly to heat the surface of the idler shaft to above the melting temperature; Step F: After the laser beam is scanned, the melted layer of the idler shaft undergoes self-cooling, solidification and crystallization.

[0022] The laser melting equipment includes a quenching CNC system. The quenching CNC system of the laser melting equipment controls the rotation and movement of the idler shaft. The laser processing system uses a helium-neon laser for precise positioning and cooperates with the light guide system for laser strengthening. The quenching CNC system servo motor accurately controls the light guide system to move up and down to keep the defocus amount consistent.

[0023] The light-absorbing paint evenly applied on the surface of the idler shaft is white silicon dioxide light-absorbing paint, which is diluted with alcohol in a ratio of 1:2.

[0024] The laser strengthening process parameters are: spot diameter of 5 mm, laser output power of 1.6 kW, defocusing amount of 120 mm, scanning speed of 1.7 m / min, and mechanical finishing allowance of 0.05-0.1 mm.

[0025] During laser melting, the displacement between the scanning belts is controlled, and a certain interval is set between two adjacent scanning belts. After strengthening, there are n laser scanning hardened belts on the idler shaft. There are soft belts between the hardened belts on the friction surface of the entire idler shaft. The existence of the soft belt is conducive to oil storage, cooling and lubrication.

[0026] like Figure 1 , 2 As shown, a laser strengthening clamping device for an unmanned power camshaft idler shaft includes a top plate 1 and a top body 2 arranged below the top plate 1. The top plate 1 is provided with a plurality of threaded countersunk holes 5 and positioning pin holes 6, and also includes positioning pins 4 matched with the positioning pin holes 6. A top plate 3 is provided at the center above the top plate 1, and also includes bolts for fixing the clamping device. The bolts are passed through the threaded countersunk holes 5 to fix the laser strengthening clamping device on the chuck of the machine tool.

[0027] In a preferred embodiment, the top body 2 is in the shape of an elongated strip for clamping in a machine tool chuck, and its shape can be an elongated cylindrical shape or other shapes that can be clamped in a chuck, and the center axes of the top body 2 and the top 3 are located on the same straight line. The top plate 1 and the top body 2 can be integrally formed.

[0028] In a preferred embodiment, the top 3 includes a top table and an ejector pin arranged in the center of the top table. When the unmanned power camshaft idler shaft laser strengthening clamping device is used, the ejector pin and the pneumatic top 7 on the machine tool are respectively pushed onto the bottom center hole of the processed camshaft idler shaft and the center hole of the top center shaft. After installation, the idler shaft and the top plate 1 of the unmanned power camshaft idler shaft laser strengthening clamping device are separated by the distance of a top table.

[0029] The two ends of the locating pin 4 are respectively transitionally fitted with the locating pin hole 6 and the axial hole of the idler shaft, which is a fit between a clearance fit and an interference fit, that is, the locating pin 4 does not rotate in the locating pin hole 6 and the axial hole of the idler shaft, but has a certain positioning effect, and the aperture of the locating pin hole 6 and the axial hole of the idler shaft are the same.

Claims

1. An unmanned power camshaft idler shaft laser strengthening clamping device, characterized in that: The invention comprises a top plate (1) and a top body (2) arranged below the top plate (1). The top plate (1) is provided with a plurality of threaded countersunk holes (5) and positioning pin holes (6), and also comprises positioning pins (4) matched with the positioning pin holes (6). A top plate (3) is arranged at the center above the top plate (1).

2. The unmanned power camshaft idler shaft laser strengthening clamping device according to claim 1 is characterized in that: The top body (2) is in the shape of an elongated strip, and the central axes of the top body (2) and the top (3) are located on the same straight line.

3. The unmanned power camshaft idler shaft laser strengthening clamping device according to claim 2 is characterized in that: The top (3) comprises a top platform and a top pin arranged in the center of the top platform.

4. The unmanned power camshaft idler shaft laser strengthening clamping device according to claim 1, characterized in that: The two ends of the positioning pin (4) are transitionally matched with the positioning pin hole (6) and the axial hole of the idler shaft respectively, and the aperture of the positioning pin hole (6) and the axial hole of the idler shaft are the same; and a bolt for fixing the clamping device is also included.

5. A laser strengthening method for an unmanned power camshaft idler shaft, characterized in that Using an unmanned power camshaft idler shaft laser reinforced clamping device, specifically including the following steps: Step A, cleaning the surface of the idler shaft, and evenly brushing the light-absorbing paint on the surface of the idler shaft; Step B, inserting the top body (2) of the idler shaft laser strengthening clamping device into the machine tool chuck (8), and fixing it to the machine tool chuck (8) through the threaded countersunk hole (5) by connecting bolts; Step C, the positioning pin (4) is installed in a suitable positioning pin hole (6), and the positioning pin (4) cooperates with the camshaft idler shaft hole for positioning; Step D, the top point (3) of the laser strengthening clamping device for the idler shaft and the pneumatic top point (7) on the machine tool are respectively pressed onto the center hole of the bottom surface of the processed camshaft idler shaft and the center hole of the top surface center shaft, and tightened; Step E, the laser melting equipment is turned on, the machine tool starts to rotate, and the laser beam of the laser processing system scans rapidly to heat the surface of the idler shaft to above the melting temperature; Step F: After the laser beam is scanned, the melted layer of the idler shaft undergoes self-cooling, solidification and crystallization.

6. The laser strengthening method for an unmanned power camshaft idler shaft according to claim 5, characterized in that: The laser melting equipment includes a quenching numerical control system, which controls the rotation and movement of the idler shaft. The laser processing system uses a helium-neon laser for precise positioning and cooperates with a light guide system for laser strengthening processing.

7. The laser strengthening method for an unmanned power camshaft idler shaft according to claim 6, characterized in that: The servo motor of the quenching CNC system accurately controls the light guide system to move up and down to keep the defocus amount consistent.

8. The laser strengthening method for an unmanned power camshaft idler shaft according to claim 5, characterized in that: The light-absorbing paint is white silica light-absorbing paint, which is diluted with alcohol in a ratio of 1:

2.

9. The laser strengthening method for an unmanned power camshaft idler shaft according to claim 6, characterized in that: The laser strengthening process parameters are: spot diameter of 5mm, laser output power of 1.6kW, defocusing amount of 120mm, scanning speed of 1.7m / min, and mechanical finishing allowance of 0.05-0.1mm.

10. Camshaft idler shaft strengthening treatment process, characterized in that The process flow includes the following steps: cutting, tempering, machining, laser strengthening treatment of the idler shaft diameter, fine machining, and finished product warehousing; the laser strengthening adopts the above-mentioned unmanned power camshaft idler shaft laser strengthening method.

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