A fixture assembly and a processing method for a tile cover

Abstract

The present application relates to the technical field of engines, and provides a fixture assembly and a processing method for a bearing cap. The fixture assembly includes a simulated cylinder head and a fixture. The simulated cylinder head is formed with a plurality of simulated mounting positions, and the plurality of simulated mounting positions are arranged at intervals along the length direction of the simulated cylinder head. The simulated mounting positions are used for positioning and mounting the bearing cap to be processed, and the distance between two adjacent simulated mounting positions is less than the distance between the actual mounting positions of the actual cylinder head; the fixture is used for clamping the bearing cap. The fixture assembly and the processing method for the bearing cap provided by the present application can reduce the processing difficulty of the camshaft hole of the bearing cap and improve the processing accuracy.

Description

Technical Field

[0001] This application relates to the technical field of engines, and particularly to a fixture assembly and a method for machining a valve cover. Background Art

[0002] The camshaft is one of the five core components of an engine. The machining quality of the camshaft holes on the valve cover directly affects the opening degree of the engine valves and even the combustion economy. Therefore, for the machining of camshaft holes, a high-precision boring machine is generally used. However, due to the very high coaxiality requirement for camshaft holes, generally within 0.05, taking a 6-cylinder engine as an example, the length of the tool for machining camshaft holes is generally about 1100 mm, and the length-diameter ratio is about 25, which belongs to typical slender hole machining. In this way, during machining, it is difficult to ensure the rigidity of the tool, making the machining difficult. Summary of the Invention

[0003] In view of this, the embodiments of this application are expected to provide a fixture assembly and a method for machining a valve cover, which can reduce the machining difficulty of the camshaft holes on the valve cover.

[0004] To achieve the above object, the technical solution of the embodiments of this application is realized as follows:

[0005] On the one hand, the embodiments of this application disclose a fixture assembly, and the fixture assembly includes:

[0006] A simulated cylinder head, which is formed with a plurality of simulated mounting positions. The plurality of simulated mounting positions are spaced along the length direction of the simulated cylinder head. The simulated mounting positions are used for positioning and mounting the valve cover to be machined, and the distance between two adjacent simulated mounting positions is less than the distance between the actual mounting positions of the actual cylinder head;

[0007] A fixture for clamping the valve cover.

[0008] In one embodiment, the distance between two adjacent simulated mounting positions is between 0.2 mm and 0.5 mm.

[0009] In one embodiment, each simulated mounting position is formed with a simulated positioning hole, and each actual mounting position is formed with an actual positioning hole. The first tolerance of the center distance between the two simulated positioning holes is less than the second tolerance of the center distance between the two actual positioning holes.

[0010] In one embodiment, the first tolerance is 1 / 8 to 1 / 3 of the second tolerance.

[0011] In one embodiment, the diameter tolerance of the simulated positioning hole is greater than the diameter tolerance of the actual positioning hole.

[0012] In one embodiment, the diameter tolerance of the simulated positioning hole is between 0 mm and 0.05 mm.

[0013] In one embodiment, the fixture assembly includes a pushing device configured to push the valve cover to move along the width direction of the simulated cylinder head.

[0014] In one embodiment, the fixture assembly includes a calibration device disposed on the simulated cylinder head, and the calibration device is configured to calibrate the machining coordinates of the cutting tool.

[0015] In one embodiment, the fixture includes a pressing head capable of moving along the thickness direction of the simulated cylinder head to press the valve cover against the simulated cylinder head.

[0016] Another aspect of the embodiments of the present application discloses a method for machining a valve cover, which is used for the fixture assembly in any one of the above embodiments, and includes:

[0017] Installing a plurality of valve covers onto a plurality of the simulated mounting positions;

[0018] Clamping the plurality of valve covers by the fixture;

[0019] Machining the camshaft holes of the plurality of valve covers from one side in the length direction of the simulated cylinder head by a cutting tool.

[0020] In one embodiment, installing a plurality of valve covers onto a plurality of the simulated mounting positions includes:

[0021] Sequentially installing the plurality of valve covers configured with numbers onto the plurality of the simulated mounting positions.

[0022] The embodiments of the present application disclose a fixture assembly and a method for machining a valve cover. By providing simulated mounting positions on the simulated cylinder head for installing valve covers, and the distance between adjacent simulated mounting positions is smaller than the distance between actual mounting positions. In this way, on the one hand, the cutting tool can complete the machining of the camshaft holes from one end at a time, without rotating the cutting tool to machine the camshaft holes from both ends, reducing errors and reducing machining procedures, so as to reduce the machining difficulty of the camshaft holes; on the other hand, since the distance between the simulated mounting positions is reduced, it is easier to ensure the rigidity of the cutting tool during machining. In this way, the machining accuracy can be improved when machining the entire camshaft hole. By using the fixture to clamp the valve cover, the machining can be made more stable, so as to further improve the machining accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of a fixture assembly provided in Embodiment 1 of the present application;

[0024] Figure 2 is another schematic structural diagram of a fixture assembly provided in Embodiment 1 of the present application;

[0025] Figure 3 isFigure 1 Structural schematic diagram of the upper tile cover

[0026] Figure 4 Flow schematic diagram of a method for processing a tile cover provided in another embodiment of the present application

[0027] Explanation of reference numerals

[0028] Fixture assembly 100; simulated cylinder head 1; fixture 2; fixture body 21; pressing head 22; pushing device 3; tile cover 200; upper tile cover 201; lower tile cover 202; positioning member 203; camshaft hole 204 Detailed implementation manners

[0029] It should be noted that, without conflict, the embodiments in the present application and the technical features in the embodiments may be combined with each other. The detailed description in the detailed implementation manners should be understood as an explanatory illustration of the purpose of the present application and should not be regarded as an improper limitation of the present application

[0030] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. The descriptions such as "first", "second", etc. in the embodiments of the present application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly including at least one feature. In the description of the embodiments of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined

[0031] One aspect of the embodiments of the present application provides a fixture assembly. Please refer to Figure 1 and Figure 2 , the fixture assembly 100 includes a simulated cylinder head 1 and a fixture 2. The simulated cylinder head 1 is formed with a plurality of simulated mounting positions 1a which are arranged at intervals along the length direction of the simulated cylinder head 1. The simulated mounting positions 1a are used for positioning and mounting the tile cover 200 to be processed, and the distance between two adjacent simulated mounting positions 1a is less than the distance between the actual mounting positions of the actual cylinder head. The fixture 2 is used for clamping the tile cover 200

[0032] In the related art, the camshaft hole can also be machined by a machining center. However, due to the limitations of the tool library, stroke and tool rigidity of the machining center, the length of the tool cannot be too long, and its length is half of the length of the camshaft hole plus 150 mm. This results in that when machining a multi-cylinder engine such as a 6-cylinder engine, the machining direction of the tool needs to be rotated. That is to say, after machining part of the camshaft hole at one end, the tool needs to be rotated from one end to the opposite end to complete the machining of the entire camshaft hole

[0033] In this embodiment, a simulated mounting position 1a is provided on the simulated cylinder head 1 for mounting the bearing cap 200, and the distance between the simulated mounting positions 1a between two adjacent bearing caps 200 is smaller than the distance between the actual mounting positions. In this way, on the one hand, the cutting tool can complete the machining of the camshaft hole 204 from one end at a time, without rotating the cutting tool to machine the camshaft hole 204 from both ends, reducing errors and reducing the machining process, so as to reduce the machining difficulty of the camshaft hole 204; on the other hand, since the distance between the simulated mounting positions 1a is reduced, it is easier to ensure the rigidity of the cutting tool during machining. In this way, the machining accuracy of the entire camshaft hole 204 can be improved when machining. By using the fixture 2 to clamp the bearing cap 200, the machining can be made more stable, so as to further improve the machining accuracy.

[0034] It can be understood that, by way of example, the simulated mounting position 1a is different from the actual mounting position, and the shape of the simulated cylinder head 1 can be substantially the same as the shape of the actual cylinder head. There are differences between the simulated cylinder head 1 and the actual cylinder head described here. The simulated cylinder head 1 is a part of the fixture assembly 100, while the actual cylinder head is a part of the engine. That is to say, the bearing cap 200 first machined the camshaft hole 204 on the simulated cylinder head 1 and then installed it on the actual cylinder head.

[0035] By way of example, in one embodiment, the cutting tool can be a boring tool.

[0036] In one embodiment, please refer to Figure 1 , the distance between two adjacent simulated mounting positions 1a is between 0.2 mm and 0.5 mm. By way of example, the distance between two adjacent simulated mounting positions 1a can be 0.2 mm. In this way, the machining length of the entire camshaft hole 204 can be shortened, so as to use a cutting tool with a shorter length for machining, which can ensure the rigidity of the cutting tool and has high machining accuracy.

[0037] In one embodiment, simulated positioning holes are formed on each simulated mounting position 1a, and actual positioning holes are formed on each actual mounting position. The first tolerance of the center distance between the two simulated positioning holes is smaller than the second tolerance of the center distance between the two actual positioning holes. In this way, the installation accuracy of the bearing cap 201 on the actual cylinder head subsequently can be improved, as well as the coaxiality and position accuracy of the camshaft hole 204.

[0038] It can be understood that when the bearing cap 200 machined on the simulated cylinder head 1 is installed on the actual cylinder head, since the distance between the simulated mounting positions 1a is smaller than the distance between the actual mounting positions, therefore, after being installed on the actual cylinder head, it will cause the error to be amplified and the accuracy of the camshaft hole 204 to be reduced.

[0039] It should be noted that the center distance of the simulated positioning holes described here refers to: the distance between the center of the Kth simulated positioning hole and the center of the first simulated positioning hole. That is to say, the center of the first simulated positioning hole is used as the reference benchmark.

[0040] The center distance of the actual positioning holes described herein refers to the distance between the center of the Kth actual positioning hole and the first simulated positioning hole. That is to say, the center of the first actual positioning hole is taken as the reference benchmark.

[0041] It can be understood that the first tolerance of the center distance between two simulated positioning holes being less than the second tolerance of the center distance between two actual positioning holes means comparing between two simulated positioning holes and two corresponding actual positioning holes. For example, the first tolerance of the center distance between the Kth simulated positioning hole and the (K - 1)th simulated positioning hole is compared with the second tolerance of the center distance between the Kth actual positioning hole and the (K - 1)th actual positioning hole.

[0042] Exemplarily, in one embodiment, please refer to Figure 3 , the valve cover 200 adopts a split design. For example, the valve cover 200 includes an upper valve cover 201 and a lower valve cover 202. The connection method between the upper valve cover 201 and the lower valve cover 202 can be screwed connection. The lower valve cover 202 can be fixed in the simulated positioning hole or the actual positioning hole through a positioning member such as a positioning ring 203 to complete the fixation between the valve cover 200 and the simulated cylinder head 1 or the actual cylinder head.

[0043] It should be noted that the machining of the camshaft hole 204 is an integral machining scheme, that is, after assembling the upper valve cover 201 and the lower valve cover 202 into one body, it is machined.

[0044] In one embodiment, the first tolerance is 1 / 8 to 1 / 3 of the second tolerance. Exemplarily, the first tolerance can be 1 / 5 of the second tolerance. For example, the first tolerance can be designed as ±0.01 mm. In this way, while improving the installation accuracy of the valve cover 200 on the simulated cylinder head 1, it also provides accuracy guarantee for the subsequent installation of the valve cover 200 on the actual cylinder head.

[0045] In one embodiment, the diameter tolerance of the simulated positioning hole is greater than the diameter tolerance of the actual positioning hole. In this way, it can avoid the structural interference when adjacent two valve covers 200 are installed, reduce the installation difficulty of the valve cover 200, and reduce the installation time.

[0046] In one embodiment, the diameter tolerance of the simulated positioning hole is between 0 mm and 0.05 mm. Exemplarily, the diameter tolerance of the positioning hole can be 0.05 mm. In this way, the positioning member 203 of the valve cover 200 can be installed into the simulated positioning hole more smoothly, reducing its installation difficulty.

[0047] In one embodiment, please refer to Figure 1, the fixture assembly 100 includes a pushing device 3, which is configured to be able to push the tile cover 200 to move along the width direction of the simulated cylinder head 1. Exemplarily, the setting position of the pushing device 3 is not limited. For example, one end of the pushing device 3 is connected to the fixture 2, and the other end is suspended on one side of the simulated cylinder head 1 along the width direction and can move along the width direction. Here, on the one hand, by pushing the pushing device 3, the outer periphery of the positioning member 203 can be closely attached to the inner wall of the simulated positioning hole to eliminate the positioning gap caused by the increase in the diameter tolerance of the simulated positioning hole. In this way, the machining accuracy of the camshaft hole 204 can be further improved; on the other hand, by arranging the pushing device 3 on one side of the width direction, the tool can be avoided, which is convenient for the tool to perform machining.

[0048] In one embodiment, the fixture assembly 100 includes a calibration device arranged on the simulated cylinder head 1, and the calibration device is configured to calibrate the machining coordinates of the tool. Exemplarily, the type of the calibration device is not limited. For example, it can be a calibration hole or a stud, etc. The coordinates of the calibration device can be the origin, such as (0, 0, 0). In this way, before each machining, by using the tool to touch the calibration device, the machining coordinates of the tool can be corrected to ensure the relative position between the tool and the simulated cylinder head 1, reduce the machining error of the subsequent tool, and improve the machining accuracy of the camshaft hole 204.

[0049] In one embodiment, the fixture 2 can drive the simulated cylinder head 1 to move. Exemplarily, one end of the fixture 2 clamps the simulated cylinder head 1, and the other end can be fixed on a machining device such as a boring machine for machining the camshaft hole 204. In this way, the fixture 2 can be driven to drive the simulated cylinder head 1 to move to eliminate the accuracy loss caused by the deformation of the fixture 2 and the pushing of the tile cover 200 by the pushing device 3, ensure that the tool is in the normal machining coordinates during machining, and has strong flexibility.

[0050] It can be understood that after the fixture 2 is used for a long time, it may be deformed, resulting in the deviation of the coordinates of the calibration device, and when the pushing device 3 pushes the tile cover 200, the position of the tile cover 200 changes, resulting in the inapplicability of the original coordinates of the calibration device.

[0051] Exemplarily, in one embodiment, the machining coordinates of the tool can be calibrated by moving the tool.

[0052] In one embodiment, please refer to Figure 2, the fixture 2 includes a pressing head 22 which can move along the thickness direction of the simulated cylinder head 1 to press the valve cap 200 onto the simulated cylinder head 1. Exemplarily, the fixture 2 includes a fixture body 21 and a pressing head 22. One side of the fixture body 21 is used to clamp the simulated cylinder head 1, and the other side is connected to the processing equipment. One end of the pressing head 22 is movably connected to the top side of the fixture body 21, and the other end is suspended above the simulated cylinder head 1 and can move along the thickness direction of the simulated cylinder head 1. In this way, before the tool processing, by pressing the valve cap 200 downward onto the simulation cylinder, the situation of the tool moving during processing can be avoided, and the stability is high.

[0053] Exemplarily, in one embodiment, the pressing head 22 can press the valve cap 200 by flipping.

[0054] Exemplarily, in one embodiment, the tool is provided with an internal cooling function. In this way, the iron chips can be flushed out of the camshaft hole 204 in time, and the temperature of the tool can be reduced, improving the service life of the tool.

[0055] Another aspect of the embodiment of the present application provides a processing method for a valve cap. Please refer to Figure 4 , for the fixture assembly 100 in any of the above embodiments, the processing method includes:

[0056] S1. Install a plurality of valve caps onto a plurality of the simulated installation positions;

[0057] S2. The fixture clamps the plurality of valve caps;

[0058] S3. The tool processes the camshaft holes of the plurality of valve caps from one side in the length direction of the simulated cylinder head.

[0059] In the processing method provided by the present application, by arranging a plurality of valve caps 200 on a plurality of simulated installation positions 1a, then clamping the plurality of valve caps 200 by the fixture 2, and finally processing the camshaft holes 204 of the plurality of valve caps 200 from one side in the length direction of the simulated cylinder head 1. In this way, on the one hand, the tool can complete the processing of the camshaft holes 204 from one end at a time, without rotating the tool, reducing errors and reducing processing procedures, so as to reduce the processing difficulty of the camshaft holes 204; on the other hand, since the distance between the simulated installation positions 1a is reduced, it is easier to ensure the rigidity of the tool during processing. In this way, the processing accuracy of the entire camshaft hole 204 can be improved. By using the fixture 2 to clamp the valve cap 200, the processing can be made more stable, further improving the processing accuracy.

[0060] In one embodiment, S1. Install a plurality of valve caps onto a plurality of the simulated installation positions, including:

[0061] S11. Install the plurality of valve caps with numbers configured thereon onto the plurality of simulated installation positions in sequence.

[0062] Exemplarily, the number of the valve covers 200 is not limited. For example, referring to the figure, it can be 7. The leftmost one is numbered 1, and then they are numbered from 1 to 7 in sequence to the right. During assembly, first pre-assemble the valve covers 200 onto the simulated cylinder head 1 in the numbered order. After the machining of the camshaft holes 204 is completed, disassemble the valve covers 200 one by one, and then install them on the actual cylinder head in the numbered order. In this way, the assembly accuracy of the valve covers 200 on the actual cylinder head can be improved.

[0063] The type of the numbering is not limited, and the numbering can adopt Chinese characters, English letters, Roman numerals, Arabic numerals, etc.

[0064] As mentioned above, it is only the preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present application are all included in the protection scope of the present application.

Claims

1. A fixture assembly, characterized in that, The fixture assembly includes: A simulated cylinder head, which is formed with a plurality of simulated mounting positions. The plurality of simulated mounting positions are arranged at intervals along the length direction of the simulated cylinder head. The simulated mounting positions are used for positioning and mounting the to-be-machined valve cover. The distance between two adjacent simulated mounting positions is smaller than the distance between the actual mounting positions of the actual cylinder head. Each simulated mounting position is formed with a simulated positioning hole, and each actual mounting position is formed with an actual positioning hole. The first tolerance of the center distance between two simulated positioning holes is smaller than the second tolerance of the center distance between two actual positioning holes. The valve cover includes an upper valve cover and a lower valve cover, and the connection manner between the upper valve cover and the lower valve cover is screwed connection. The lower valve cover is fixed in the simulated positioning hole or the actual positioning hole through a positioning member. After the upper valve cover and the lower valve cover are assembled into one body, the camshaft hole is machined on it; A fixture for clamping the valve cover.

2. The jig assembly according to claim 1, wherein, The distance between two adjacent simulated mounting positions is between 0.2 mm and 0.5 mm.

3. The fixture assembly according to claim 1, wherein The first tolerance is 1 / 8 to 1 / 3 of the second tolerance.

4. The jig assembly according to claim 1, characterized in that, The diameter tolerance of the simulated positioning hole is greater than the diameter tolerance of the actual positioning hole.

5. The jig assembly according to claim 4, characterized in that, The diameter tolerance of the simulated positioning hole is between 0 mm and 0.05 mm.

6. The fixture assembly according to claim 1, characterized in that, The fixture assembly includes a pushing device, and the pushing device is configured to be able to push the valve cover to move along the width direction of the simulated cylinder head.

7. The jig assembly according to claim 1, characterized in that, The fixture assembly includes a calibration device arranged on the simulated cylinder head, and the calibration device is configured to calibrate the machining coordinates of the tool.

8. The jig assembly according to claim 1, characterized in that, The fixture includes a pressure head, and the pressure head can move along the thickness direction of the simulated cylinder head to press the valve cover onto the simulated cylinder head.

9. A processing method for a tile cover, which is used for the fixture assembly according to any one of claims 1 to 8, characterized in that, Including: Installing a plurality of valve covers onto a plurality of the simulated mounting positions; The fixture clamping the plurality of valve covers; The tool machining the camshaft holes of the plurality of valve covers from one side in the length direction of the simulated cylinder head.

10. The processing method according to claim 9, characterized in that, Installing a plurality of valve covers onto a plurality of the simulated mounting positions includes: Sequentially installing the plurality of valve covers with numbers configured onto the plurality of the simulated mounting positions.

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