A process for grinding and polishing cam parts

Abstract

The present invention belongs to the technical field of grinding and polishing devices, and particularly relates to a process for grinding and polishing a cam portion. The specific steps include designing a grinding and polishing mechanism, adjusting the grinding and polishing mechanism before grinding, grinding, replacing a brush unit with a polishing unit, and polishing. The present invention combines the functions of grinding and polishing a cam portion, and is significantly more convenient and labor-saving than the original manual operation or operation on different machine tools. It can be adjusted to accommodate camshafts of various sizes, reduces the manufacturing cost of the brush unit, and can be replaced in a targeted and simple manner when the brush is damaged. The polishing unit used during polishing can both meet polishing requirements and is suitable for the grinding and polishing mechanism of this process.

Description

Technical Field

[0001] The invention belongs to the technical field of grinding and polishing devices, and in particular relates to a process for grinding and polishing a cam part. Background Art

[0002] The camshaft is an important component used in automobile engines. The camshaft has multiple cam parts. After machining, the cam parts will produce burrs and need further grinding and polishing. Currently, grinding and polishing are performed manually on different machine tools. In addition, the brushes used in the grinding process are usually whole brushes. Since some brushes rotate idly and the degree of wear is uneven, a large amount of brush waste is caused during replacement. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, the present invention provides a process that can simultaneously grind and polish the cam portion and can be adjusted to suit camshafts of different sizes.

[0004] The technical solution adopted is: a process for grinding and polishing cam parts, which includes at least a workpiece to be processed having multiple cam parts and a grinding and polishing mechanism. The workpiece to be processed is set on a support mechanism that can rotate about its own axis. The specific steps are as follows:

[0005] Step 1. Design a grinding and polishing mechanism: The grinding and polishing mechanism includes at least a drive motor, a brush shaft connected to the drive motor, a plurality of detachable brush units and spacers sleeved outside the brush shaft, and a spacer is provided between every two adjacent brush units;

[0006] Step 2. Adjust the grinding and polishing mechanism before grinding: Take the same number of brush units as the cam portions of the workpiece to be processed, adjust the corresponding positions according to the spacing of the cam portions of the workpiece to be processed, and adjust the length of the spacer between two adjacent brush units. Adjust the length of the spacer between each two adjacent brush units to be equal to or less than the spacing of the cam portions of the corresponding workpiece to be processed, so that the positions of the brush units correspond to the positions of the cam portions of the workpiece to be processed and the brush units are in contact with the corresponding cam portions;

[0007] Step 3. Grinding: Rotate the workpiece and the brush shaft simultaneously, spray water above the contact point between the brush unit and the cam portion, and stop rotating the workpiece and the brush shaft and spraying water after grinding is completed.

[0008] Step 4. Replace the brush unit with a polishing unit. Each polishing unit consists of several independent polishing filaments and a barrel that holds the polishing filaments. The barrel is annular and matches the size of the brush core. The polishing filaments consist of an iron wire with silicon carbide particles at the end. The polishing unit is the same size as the brush unit. The silicon carbide particles in the polishing filaments come into contact with the cam portion of the workpiece to be processed.

[0009] Step 5. Polishing: Rotate the workpiece and the brush shaft simultaneously, spray polishing liquid above the contact point between the brush unit and the cam portion, and stop rotating the workpiece and the brush shaft and spraying polishing liquid after polishing is completed;

[0010] Step 6. Repeat steps 2 to 5 when changing to a workpiece of different size.

[0011] Moreover, in step 1, both ends of the brush shaft are provided with limiting rings or limiting baffles for limiting the movement of the brush unit and the spacer, and the brush shaft is connected to the driving motor through a chain and sprocket or through a belt and pulley.

[0012] Moreover, in step 1, a water pipe with a water outlet and a polishing liquid pipe are provided above the grinding and polishing mechanism, the water outlet is facing the position where the brush unit contacts the cam part, the water pipe is connected to the water tank through a first water pump, and the polishing liquid pipe is connected to the polishing liquid tank through a second water pump; a drainage hole is provided below the grinding and polishing mechanism, the drainage hole is connected to the waste liquid tank, and the drainage hole is located below the position where the brush unit contacts the cam part.

[0013] Moreover, in step 1, the outer surface of the spacer is provided with anti-slip protrusions.

[0014] Moreover, in step 1, the grinding and polishing mechanism is arranged on a platform that moves along the axis of the workpiece to be processed, and the platform drives the brush shaft to vibrate along the axis of the workpiece to be processed.

[0015] Moreover, in step 2, the length of the spacer between two adjacent brush units is adjusted by making the spacers into different lengths in advance and replacing them according to needs, or the size of a single spacer is fixed and the adjustment is achieved by increasing or decreasing the number of spacers.

[0016] Moreover, the method for replacing the brush unit with the polishing unit in step 4 is to disassemble the brush unit and the spacer in step 2, take the same number of polishing units as the brush units, replace all the brush units with the polishing units, and keep the length of the spacer the same as the length of the spacer in step 2.

[0017] Moreover, the method for replacing the brush unit with the polishing unit in step 4 is to replace the brush shaft with the second shaft as a whole, and the polishing unit and the spacer are provided on the outer sleeve of the second shaft, and the arrangement order of the polishing unit and the spacer arranged outside the second shaft is the same as the order of the brush unit and the spacer outside the brush shaft in step 2.

[0018] Compared with the existing technology, the beneficial effects of this technical solution are: First, this process has the functions of grinding and polishing the cam part, which is obviously more convenient and labor-saving than the original manual operation and operation on different machine tools. Second, this process can adjust the length of the spacer between two adjacent brush units according to the corresponding position of the cam part spacing of the workpiece to be processed, so as to achieve adjustment to adapt to camshafts of various sizes. Third, the production cost of the brush unit is reduced, and the brush can be replaced in a targeted manner when it is damaged, and the operation is simple, and there will be no problem of brush idling or uneven brush wear leading to waste. Fourth, due to the different requirements for brush material in the grinding and polishing processes, a polishing unit with the same size as the brush unit and upgraded structure is designed. The polishing wire of the polishing unit consists of iron wire and silicon carbide particles provided at the end of the iron wire, which cooperates with the polishing liquid to achieve the polishing effect. The improved polishing unit can not only meet the polishing requirements but also be suitable for the grinding and polishing mechanism of this process. 5. The grinding and polishing mechanism is arranged on a platform that moves along the axis of the workpiece to be processed. The platform drives the brush shaft to vibrate slightly along the axis of the workpiece to be processed, providing the brush unit with the function of grinding the cam part along the axial direction, thereby improving the grinding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front view of a schematic structural diagram of an embodiment;

[0020] Figure 2 It is a rear view of the schematic structural diagram of the embodiment;

[0021] Figure 3 A top view of a schematic structural diagram of an embodiment;

[0022] Description of reference numerals:

[0023] Device table 1, support mechanism 2, workpiece to be processed 3, cam part 4, brush shaft 5, drive motor 6, brush unit 7, spacer 8, water pipe 9, polishing liquid pipe 10, water tank 11, polishing liquid tank 12, waste liquid tank 13, drainage hole 14, limiting ring or limiting baffle 15, anti-slip protrusion 16, water outlet 17, platform 18. DETAILED DESCRIPTION

[0024] The present invention will be described in detail below with reference to the accompanying drawings and embodiments, but the present invention is not limited to the following embodiments.

[0025] A process for grinding and polishing a cam portion includes at least a workpiece to be processed having multiple cam portions and a grinding and polishing mechanism. The workpiece to be processed is usually a camshaft. The workpiece to be processed is placed on a support mechanism that allows it to rotate about its own axis. The specific steps are as follows:

[0026] Step 1. Design a grinding and polishing mechanism: The grinding and polishing mechanism at least includes a drive motor, a brush shaft connected to the drive motor, a plurality of detachable brush units and spacers sleeved outside the brush shaft, and a spacer is provided between every two adjacent brush units; for example Figures 1 to 3 As shown, Figure 1 This is the main view from the brush shaft side. Figure 2 The rear view is viewed from the side of the workpiece to be processed. Figure 3 The top view of the water pipe and the polishing liquid pipe is not drawn. The grinding and polishing mechanism is arranged on the device table 1. The supporting mechanism 2 supports or fixes the two ends of the workpiece to be processed 3 and can drive the workpiece to be processed to rotate. The workpiece to be processed has four cam parts 4 of different sizes. The brush shaft 5 is connected to the driving motor 6 through a chain and a sprocket or through a belt and a pulley. A spacer 8 is provided between every two adjacent brush units 7. The inner diameter of the brush unit and the inner diameter of the spacer are matched with the outer diameter of the brush shaft, and the outer diameter of the spacer is smaller than the outer diameter of the brush unit. The length of the spacer between every two adjacent brush units is equal to or smaller than the corresponding cam part spacing of the workpiece to be processed. The number of brush units is the same as the number of cam parts, and the position of the brush unit corresponds to the position of the cam part of the workpiece to be processed. Limiting rings or limiting baffles 15 are provided at both ends of the brush shaft to limit the movement of the brush unit and the spacer, which play a fixing role after the brush unit and the spacer are installed. The outer surface of the spacer is provided with an anti-slip protrusion 16 to facilitate loading and unloading of the spacer. A water pipe 9 with a water outlet 17 and a polishing liquid pipe 10 are provided above the grinding and polishing mechanism. The water outlet is directed toward the position where the brush unit contacts the cam portion. A water tank 11, a polishing liquid tank 12 and a waste liquid tank 13 are provided below the device table. The water pipe is connected to the water tank through a first water pump, and the polishing liquid pipe is connected to the polishing liquid tank through a second water pump. A drainage hole 14 is provided below the grinding and polishing mechanism. The drainage hole is connected to the waste liquid tank. The drainage hole is located below the position where the brush unit contacts the cam portion and is used to discharge the burrs dropped by grinding into the waste water tank.

[0027] Step 2. Adjust the grinding and polishing mechanism before grinding: Take the same number of brush units as the cam parts of the workpiece to be processed, adjust the corresponding position according to the spacing of the cam parts of the workpiece to be processed, adjust the length of the spacer between two adjacent brush units, and adjust the length of the spacer between every two adjacent brush units to be equal to or less than the corresponding cam part spacing of the workpiece to be processed, so that the position of the brush unit corresponds to the position of the cam part of the workpiece to be processed, and the brush unit contacts the corresponding cam part; due to the different sizes of each cam part, the size of the brush unit needs to be made slightly larger than each cam part to ensure that the brush unit can be applied to the workpiece Any single cam part; the number of brush units is the same as the number of cam parts, and the position of the brush unit can be made corresponding to the position of the cam part of the workpiece to be processed by adjusting the length of the spacer; the length of the spacer between two adjacent brush units is adjusted by making the spacer into different lengths and sizes in advance and replacing them according to needs, or the size of a single spacer is fixed and the adjustment is achieved by increasing or decreasing the number of spacers, thereby achieving a one-to-one correspondence between the brush unit and the cam part position, and there will be no problem of waste caused by idling of the brush or uneven wear of the brush. When replacing a damaged brush, only the damaged brush unit needs to be replaced, and the normal use of other brush units will not be affected.

[0028] Step 3. Grinding: Rotate the workpiece and the brush shaft simultaneously, spray water above the contact point between the brush unit and the cam portion, and stop rotating the workpiece and the brush shaft and spraying water after grinding is completed.

[0029] Step 4. Replace the brush unit with a polishing unit: Since conventional brushes cannot achieve the polishing function, the structure of the polished workpiece needs to be improved. The polishing unit of this process is composed of several independent polishing wires and a barrel that fixes the polishing wires. The barrel is in a ring shape that matches the size of the brush core shaft. The polishing wire is composed of iron wire and silicon carbide particles arranged at the end of the iron wire. The size of the polishing unit is the same as that of the brush unit. The silicon carbide particles of the polishing wire are allowed to contact the cam part of the workpiece to be processed. During production, the silicon carbide particles can be welded to the end of the iron wire. The improved polishing unit can meet the polishing requirements and is suitable for the grinding and polishing mechanism of this process.

[0030] The first method to replace the polishing unit is to disassemble the brush unit and spacer in step 2, take the same number of polishing units as the brush units, replace all the brush units with the polishing units, and keep the length of the spacer in step 2; the second method to replace the polishing unit is to replace the brush shaft with the second shaft as a whole, and the second shaft is outer-circuited with polishing units and spacers, and the arrangement order of the polishing units and spacers outside the second shaft is the same as the order of the brush units and spacers outside the brush shaft in step 2.

[0031] Step 5. Polishing: Rotate the workpiece and the brush shaft simultaneously, and spray polishing liquid above the contact point between the brush unit and the cam portion. After polishing is completed, stop rotating the workpiece and the brush shaft, and stop spraying the polishing liquid. Silicon carbide polishing liquid can be used as the polishing liquid.

[0032] Step 6. When replacing workpieces of different sizes, repeat steps 2 to 5 to adjust to camshafts of various sizes.

[0033] To further improve the axial grinding effect, the grinding and polishing mechanism in step 1 is arranged on a platform 18 that moves along the axis of the workpiece to be processed. The platform drives the brush shaft to vibrate along the axis of the workpiece to be processed, providing the brush unit with the function of grinding the cam part along the axial direction.

[0034] Compared with the existing technology, the beneficial effects of this technical solution are: First, this process has the functions of grinding and polishing the cam part, which is obviously more convenient and labor-saving than the original manual operation and operation on different machine tools. Second, this process can adjust the length of the spacer between two adjacent brush units according to the corresponding position of the cam part spacing of the workpiece to be processed, so as to achieve adjustment to adapt to camshafts of various sizes. Third, the production cost of the brush unit is reduced, and the brush can be replaced in a targeted manner when it is damaged, and the operation is simple, and there will be no problem of brush idling or uneven brush wear leading to waste. Fourth, due to the different requirements for brush material in the grinding and polishing processes, a polishing unit with the same size as the brush unit and upgraded structure is designed. The polishing wire of the polishing unit consists of iron wire and silicon carbide particles provided at the end of the iron wire, which cooperates with the polishing liquid to achieve the polishing effect. The improved polishing unit can not only meet the polishing requirements but also be suitable for the grinding and polishing mechanism of this process. 5. The grinding and polishing mechanism is arranged on a platform that moves along the axis of the workpiece to be processed. The platform drives the brush shaft to vibrate slightly along the axis of the workpiece to be processed, providing the brush unit with the function of grinding the cam part along the axial direction, thereby improving the grinding effect.

Claims

1. A process for grinding and polishing a cam portion, comprising at least a workpiece to be processed having multiple cam portions and a grinding and polishing mechanism, characterized in that The specific steps are: Step 1. Design a grinding and polishing mechanism: The grinding and polishing mechanism includes at least a drive motor, a brush shaft connected to the drive motor, a plurality of detachable brush units and spacers sleeved outside the brush shaft, and a spacer is provided between every two adjacent brush units; Step 2. Adjust the grinding and polishing mechanism before grinding: Take the same number of brush units as the cam portions of the workpiece to be processed, adjust the corresponding positions according to the spacing of the cam portions of the workpiece to be processed, and adjust the length of the spacer between two adjacent brush units. Adjust the length of the spacer between each two adjacent brush units to be equal to or less than the spacing of the cam portions of the corresponding workpiece to be processed, so that the positions of the brush units correspond to the positions of the cam portions of the workpiece to be processed and the brush units are in contact with the corresponding cam portions; Step 3. Grinding: Rotate the workpiece and the brush shaft simultaneously, spray water above the contact point between the brush unit and the cam portion, and stop rotating the workpiece and the brush shaft and spraying water after grinding is completed. Step 4. Replace the brush unit with a polishing unit. Each polishing unit consists of several independent polishing filaments and a barrel that holds the polishing filaments. The barrel is annular and matches the size of the brush core. The polishing filaments consist of an iron wire with silicon carbide particles at the end. The polishing unit is the same size as the brush unit. The silicon carbide particles in the polishing filaments come into contact with the cam portion of the workpiece to be processed. Step 5. Polishing: Rotate the workpiece and the brush shaft simultaneously, spray polishing liquid above the contact point between the brush unit and the cam portion, and stop rotating the workpiece and the brush shaft and spraying polishing liquid after polishing is completed; Step 6. Repeat steps 2 to 5 when changing to workpieces of different sizes.

2. The process for grinding and polishing the cam portion according to claim 1, characterized in that: In step 1, both ends of the brush shaft are provided with limiting rings or limiting baffles for limiting the movement of the brush unit and the spacer, and the brush shaft is connected to the driving motor through a chain and sprocket or through a belt and pulley.

3. The process for grinding and polishing the cam portion according to claim 1, characterized in that: In step 1, a water pipe with a water outlet and a polishing liquid pipe are provided above the grinding and polishing mechanism, the water outlet is directed toward the position where the brush unit contacts the cam portion, the water pipe is connected to the water tank through a first water pump, and the polishing liquid pipe is connected to the polishing liquid tank through a second water pump; a drainage hole is provided below the grinding and polishing mechanism, the drainage hole is connected to the waste liquid tank, and the drainage hole is located below the position where the brush unit contacts the cam portion.

4. The process for grinding and polishing a cam portion according to claim 1, wherein: In step 1, the outer surface of the spacer is provided with anti-slip protrusions.

5. The process for grinding and polishing a cam portion according to claim 1, characterized in that: In step 1, the grinding and polishing mechanism is arranged on a platform that moves along the axis of the workpiece to be processed, and the platform drives the brush shaft to vibrate along the axis of the workpiece to be processed.

6. The process for grinding and polishing a cam portion according to claim 1, characterized in that: In step 2, the length of the spacer between two adjacent brush units is adjusted by making the spacers into different lengths in advance and replacing them according to needs, or the size of a single spacer is fixed and the adjustment is achieved by increasing or decreasing the number of spacers.

7. The process for grinding and polishing a cam portion according to claim 1, characterized in that: The method for replacing the brush unit with the polishing unit in step 4 is to disassemble the brush unit and spacer in step 2, take the same number of polishing units as the brush units, replace all the brush units with the polishing units, and keep the length of the spacer the same as the length of the spacer in step 2.

8. The process for grinding and polishing a cam portion according to claim 1, characterized in that: The method for replacing the brush unit with the polishing unit in step 4 is to replace the brush shaft with the second shaft as a whole, and the polishing unit and the spacer are provided on the outer sleeve of the second shaft, and the arrangement order of the polishing unit and the spacer outside the second shaft is the same as the order of the brush unit and the spacer outside the brush shaft in step 2.

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