Clamp for grinding surface of intake and exhaust valve of engine

Abstract

The utility model discloses a fixture for grinding the surface of an intake and exhaust valve of an engine, which relates to valve stem processing and comprises a connecting piece, a worktable is rotatably mounted on the side wall of the connecting piece, an electromagnetic coil is mounted in the worktable, a surface disc is fixedly mounted on one side, far away from the connecting piece, of the worktable, and the electromagnetic coil is mounted on the surface disc. A supporting piece is fixedly arranged below the connecting piece, a supporting base is installed on the supporting piece in a sliding mode, a supporting rod with the adjustable height position is installed above the supporting base, and the tail end of the supporting rod is provided with a positioning supporting part used for supporting a rod body of an air valve. According to the air valve clamping device, the stability of an air valve in the machining process can be effectively improved, a better clamping effect is achieved, and the problems that in the prior art, due to the fact that a mechanical clamping part is prone to blocking the surface of the air valve, surface strengthening grinding is not in place, and grinding is not uniform are solved.

Description

Technical Field

[0001] The utility model relates to valve stem processing, and more specifically, it relates to a clamp for grinding the surface of an engine intake and exhaust valve. Background Art

[0002] The intake and exhaust valves (hereinafter referred to as valves) are key parts in the engine, which are used to control the inlet and outlet of the gas in the cylinder, realize the normal cylinder compression, combustion and exhaust process, and thus ensure the normal operation and performance of the engine. Due to the working conditions of the valves, their surfaces are exposed to the high-temperature airflow and the high-temperature gas in the combustion chamber. Long-term exposure to high temperature and thermal stress may cause cracks in the valves. In addition, the vibration and impact during engine operation will also have an adverse effect on the valves. Continuous vibration and impact will also cause fatigue and cracking of the valve material.

[0003] In order to solve the problem of valve fatigue and cracking, the relevant technology adopts a surface strengthening grinding modification technology to strengthen the valve's anti-fatigue, anti-corrosion, anti-wear and high temperature resistance. Strengthening modification grinding processing is a composite processing method. The principle of this method is to mix shot peening, grinding powder, grinding fluid and compressed gas, and spray them onto the surface of the workpiece to be processed. Through the mixed jet flow of oblique high-speed injection, random collisions (plastic processing, generating residual compressive stress) and micro-cutting (grinding) with equal probability will occur on the workpiece surface, so that the metal workpiece surface has lower roughness and consistency (control shape).

[0004] Since the material impacts the valve surface at high speed, the surface strengthening grinding modification technology requires stable clamping. However, most of the existing clamps are mechanical clamps, which not only have the problem of insufficient clamping force, but also the mechanical clamping part easily blocks the valve surface, resulting in inadequate surface strengthening grinding and uneven grinding. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a clamp for surface grinding of engine intake and exhaust valves in view of the deficiencies in the prior art, thereby improving the stability of the valves during the machining process and solving the problem in the prior art that the mechanical clamping part easily blocks the valve surface, resulting in inadequate and uneven surface strengthening grinding.

[0006] The utility model describes a fixture for surface grinding of engine intake and exhaust valves, comprising a connecting piece, a workbench rotatably mounted on the side wall of the connecting piece, an electromagnetic coil mounted in the workbench, a face plate fixedly mounted on the side of the workbench away from the connecting piece, a supporting piece fixedly mounted below the connecting piece, a supporting base slidably mounted on the supporting piece, a supporting rod with adjustable height mounted above the supporting base, a positioning support portion for supporting a rod body of the valve is provided at the end of the supporting rod.

[0007] As a further improvement, the positioning support portion is a V-shaped groove opened at the end of the valve.

[0008] Furthermore, a self-lubricating material coating is provided in the V-shaped groove.

[0009] As a further improvement, a slot matching the support rod is provided in the support base, the support rod is inserted in the support base, a threaded hole connected to the slot is provided on one side of the support base, and a tightening bolt is screwed into the threaded hole.

[0010] As a further improvement, the support member is provided with a dovetail groove, the support base is provided with a sliding portion matching the dovetail groove, and the sliding portion is slidably connected to the dovetail groove.

[0011] Furthermore, a material return channel is provided at the bottom of the dovetail groove.

[0012] Furthermore, the bottom of the return channel is arranged to be inclined downward from one end close to the connecting piece to the other end.

[0013] As a further improvement, a tightening piece is provided on the face plate, and the tightening piece is fixedly mounted on the face plate by a locking bolt.

[0014] Beneficial Effects

[0015] The advantages of the utility model are: the valve on the face plate is adsorbed by the electromagnetic coil installed in the workbench, and a non-contact clamping method for the processing surface is adopted, which solves the problem that the mechanical clamping part in the prior art easily blocks the valve surface, resulting in inadequate surface strengthening grinding and uneven grinding. In addition, the adsorption of the valve by the electromagnetic coil, combined with the support of the valve stem body by the supporting base, the supporting rod and the positioning support part arranged at the end of the supporting rod, can effectively improve the stability of the valve during the processing process and achieve a better clamping effect. In addition, the positions of the supporting base and the supporting rod are adjustable, so that the clamp can be applied to the processing of valves of different models, which improves the flexibility and scope of application of the clamp. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the clamp of the utility model;

[0017] Figure 2 It is a right view structural schematic diagram of the clamp of the utility model;

[0018] Figure 3 It is a schematic diagram of the structure of the positioning support part of the utility model.

[0019] Among them: 1-connecting part, 2-working table, 3-face plate, 4-positioning support part, 5-processing liquid nozzle, 6-valve, 7-supporting part, 8-dovetail groove, 9-return channel, 10-supporting base, 11-supporting rod, 12-fastening part, 13-locking bolt, 14-self-lubricating material coating. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the embodiments, but does not constitute any limitation to the utility model. Any limited modifications made by anyone within the scope of the claims of the utility model are still within the scope of the claims of the utility model.

[0021] See also Figure 1-Figure 3 The utility model discloses a fixture for surface grinding of an engine intake and exhaust valve, comprising a connector 1, which is mounted on a machine tool. A workbench 2 is rotatably mounted on the side wall of the connector 1, and the workbench 2 is connected to the rotating shaft of the machine tool. An electromagnetic coil is mounted in the workbench 2. The electromagnetic coil can be connected to an external power source through an electric slip ring, so that it can be powered during rotation. A face plate 3 is fixedly mounted on the side of the workbench 2 away from the connector 1. The face plate 3 is used to place the valve 6. When current passes through the electromagnetic coil, a magnetic field is generated around the electromagnetic coil, and the magnetic force will tightly absorb the end face of the valve 6, thereby fixing the valve. In addition, at least two fastening members 12 are provided on the face plate 3, and the fastening members 12 are fixedly mounted on the face plate 3 by locking bolts 13. For example, when three fastening members 12 are provided, after the valve 6 is adsorbed, the three fastening members 12 are mounted on the face plate 3 at different positions, so that the valve 6 can be positioned to prevent it from being offset during the processing. If two pressing members 12 are provided, the electromagnetic coil and the valve need to be provided with different axes, that is, there is an eccentricity between the axes of the two. During the processing, when the workbench 2 rotates, due to the eccentricity between the valve 6 and the electromagnetic coil, a torque and a friction force pointing to the axis of the workbench 2 will be generated between the two. This torque will drive the valve 6 to rotate with the workbench 2 without the phenomenon of relative rotation between the workbench 2 and the valve 6, and the friction force will force the valve 6 to advance toward the axis of the workbench 2 and form a stable clamping position for the valve 6 with the two pressing members 12.

[0022] In this embodiment, for different types of valves 6 , the valves 6 can be matched by replacing the pressing pieces 12 of corresponding sizes, so that the valves 6 of different types can always be positioned at the center of the face plate 3 .

[0023] A support member 7 is fixedly provided below the connecting member 1, and a support base 10 is slidably installed on the support member 7, so that the support position of the support rod 11 on the rod body of the valve 6 is adjustable, which has better flexibility. A support rod 11 with adjustable height position is installed above the support base 10, so that the clamp of this embodiment can support rod bodies of different diameters, greatly improving the flexibility of the clamp and broadening the scope of application of the clamp. A positioning support part 4 for supporting the rod body of the valve 6 is provided at the end of the support rod 11.

[0024] In this embodiment, the positioning support portion 4 is a V-shaped groove formed at the end of the valve 6. A self-lubricating material coating 14 is provided in the V-shaped groove to reduce the friction force on the valve 6 during rotation, thereby facilitating normal processing of the valve 6.

[0025] A slot matching the support rod 11 is provided in the support base 10, and the support rod 11 is inserted into the support base 10. A threaded hole connected to the slot is provided on one side of the support base 10, and a tightening bolt is screwed into the threaded hole, thereby realizing the height adjustment of the support rod 11 and the positioning locking of the adjusted support rod 11.

[0026] The support member 7 is provided with a dovetail groove 8 , and the support base 10 is provided with a sliding portion matching the dovetail groove 8 . The sliding portion is slidably connected to the dovetail groove 8 , thereby realizing the sliding installation between the support member 7 and the support base 10 .

[0027] The bottom of the dovetail groove 8 of this embodiment is provided with a return channel 9. During the processing, the processing liquid will flow to the return channel 9, realizing the recovery of the processing liquid and also avoiding the problem of the processing liquid accumulating in the dovetail groove 8.

[0028] Preferably, the bottom of the return channel 9 is arranged to be inclined downward from one end close to the connector 1 to the other end, so that the processed liquid can automatically flow out along the return channel 9, thereby preventing the return channel 9 from being blocked.

[0029] The working principle of the utility model is as follows: after the connecting piece 1 and the workbench 2 are connected to the machine tool and its rotating shaft respectively, the valve 6 to be processed is placed at the center of the face plate 3, and then the electromagnetic coil is powered on to adsorb the valve 6; then the pressing piece 12 is installed on the face plate 3 so that the pressing piece 12 contacts the edge of the valve 6. The position of the supporting base 10 and the supporting rod 11 is adjusted so that the positioning support part 4 is located below the rod body of the valve 6 and forms an effective support for the rod body of the valve 6, thereby completing the installation of the fixture and the clamping of the valve 6 to be processed. Finally, the processing liquid nozzle 5 is placed in front of the surface to be processed of the valve 6, and the processing liquid nozzle 5 faces the surface to be processed of the valve 6, and then the rotating shaft of the machine tool is started to drive the valve 6 to rotate, and the pellets, abrasive powder, abrasive liquid and compressed gas used for processing are mixed and sprayed onto the surface of the valve 6 to be processed through the processing liquid nozzle 5, thereby processing the surface of the valve 6.

[0030] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A fixture for grinding the surface of an engine intake and exhaust valve, characterized in that: The invention comprises a connecting member (1), a workbench (2) is rotatably mounted on the side wall of the connecting member (1), an electromagnetic coil is mounted in the workbench (2), a face plate (3) is fixedly mounted on the side of the workbench (2) away from the connecting member (1), a supporting member (7) is fixedly mounted below the connecting member (1), a supporting base (10) is slidably mounted on the supporting member (7), a supporting rod (11) with adjustable height is mounted above the supporting base (10), and a positioning support portion (4) for supporting a rod body of a valve (6) is provided at the end of the supporting rod (11).

2. A fixture for grinding the surface of an engine intake and exhaust valve according to claim 1, characterized in that: The positioning support portion (4) is a V-shaped groove formed at the end of the valve (6).

3. A fixture for grinding the surface of an engine intake and exhaust valve according to claim 2, characterized in that: A self-lubricating material coating (14) is provided in the V-shaped groove.

4. A fixture for grinding the surface of an engine intake and exhaust valve according to claim 1, characterized in that: The support base (10) is provided with a slot matching the support rod (11), the support rod (11) is inserted into the support base (10), and one side of the support base (10) is provided with a threaded hole connected to the slot, and a tightening bolt is screwed into the threaded hole.

5. The fixture for grinding the surface of an engine intake and exhaust valve according to claim 1, characterized in that: The support member (7) is provided with a dovetail groove (8), and the support base (10) is provided with a sliding portion matching the dovetail groove (8), and the sliding portion is slidably connected to the dovetail groove (8).

6. A fixture for grinding the surface of an engine intake and exhaust valve according to claim 5, characterized in that: A material return channel (9) is provided at the bottom of the dovetail groove (8).

7. A fixture for grinding the surface of an engine intake and exhaust valve according to claim 6, characterized in that: The bottom of the return channel (9) is arranged to be inclined downward from one end close to the connecting piece (1) to the other end.

8. The fixture for grinding the surface of an engine intake and exhaust valve according to claim 1, characterized in that: The face plate (3) is provided with a tightening member (12), and the tightening member (12) is fixedly mounted on the face plate (3) via a locking bolt (13).

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