A honing fixture for machining special-shaped cylinder bores of engine cylinder blocks

Abstract

The present invention discloses a honing fixture for machining special-shaped cylinder bores of an engine cylinder block, comprising a fixing member and a positioning member used in conjunction with each other; wherein the fixing member comprises a mounting plate, and positioning pins matching positioning holes on a product are fixedly connected to the mounting plate on both sides; a supporting block is also arranged between the mounting plate and the product; a concave arc surface is arranged on one side of the filling block, and a convex arc surface is arranged on the other side, and the two sides of the concave arc surface contact the two sides of the incomplete arc surface of the special-shaped cylinder bore to form a complete circular hole; the diameter corresponding to the concave arc surface is the same as the diameter corresponding to the incomplete arc surface, and the center of the circle corresponding to the concave arc coincides with the center of the circle corresponding to the incomplete arc surface. This design can ensure machining accuracy.

Description

Technical Field

[0001] The invention belongs to the technical field of cylinder block parts processing, in particular to a honing fixture for processing special-shaped cylinder holes of an engine cylinder block. Background Art

[0002] The cylinder block is the main part of the engine. During the cylinder block processing, the machining accuracy of the cylinder bore is the core technology of cylinder block manufacturing and the basic way to achieve the engine design performance indicators. Usually, the cylinder bore is processed by fine boring and then honing to ensure the machining accuracy of the cylinder bore.

[0003] Honing is a process that uses multiple oilstones installed on the honing head. The expansion mechanism expands the oilstones radially and presses them against the wall of the workpiece hole. At the same time, the honing machine spindle drives the honing head to rotate while making linear up and down reciprocating motion. The honing head is floating between the honing head and the machine tool spindle. During processing, the honing head is guided by the wall of the workpiece hole. When there is a large crack in the wall of the workpiece hole, the actual position of the honing head will deviate from the required position, resulting in shape errors in the processed product. Usually, a pneumatic measuring mechanism is designed on the honing head, which can automatically detect the dimensional accuracy and shape accuracy of the workpiece and make automatic adjustments. When there is a large crack at the mouth of the workpiece hole wall, the automatic measuring mechanism will not be used, affecting the dimensional accuracy and shape accuracy of the product. There are several special-shaped cylinder holes on the engine cylinder block. Special-shaped cylinder holes are generally holes in the engine cooling water channel. Conventional processing methods are used to process special-shaped cylinder holes, which cannot guarantee the shape and position tolerances and may even cause product scrapping.

[0004] A cylinder block honing machine is disclosed in the patent with application number CN201921043619.5, which includes a honing fixture and a pallet. The honing fixture is provided with a first positioning member for positioning the first model of the engine cylinder block, and the pallet is provided with a second positioning member for positioning the second model of the engine cylinder block, and the pallet is detachably connected to the honing fixture. The honing fixture that matches the first model of the engine cylinder block can be positioned with the second model of the engine cylinder block through the pallet, thereby completing the honing process of the second model of the engine cylinder block. This technical solution can only be used to process ordinary straight holes, and the processing accuracy of special-shaped cylinder holes cannot be guaranteed. Summary of the invention

[0005] The purpose of the present invention is to provide a honing fixture for machining special-shaped cylinder holes of an engine cylinder block, so as to solve the problem mentioned in the background art that the existing honing fixture cannot ensure the shape and position tolerance when machining special-shaped holes.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A honing fixture for machining special-shaped cylinder bores of an engine cylinder block is used to clamp and position a product, and includes a fixing member and a positioning member used in conjunction with each other; wherein the fixing member includes a mounting plate, and positioning pins that match positioning holes on the product are fixedly connected to the two sides of the mounting plate; a support block is also provided between the mounting plate and the product;

[0008] The positioning piece includes an upper clamping plate and a lower clamping plate, which are connected by studs; both the upper clamping plate and the lower clamping plate are matched with the center hole of the product; a plurality of filling blocks are arranged on one side of the upper clamping plate and one side of the lower clamping plate, wherein the positions of the filling blocks are matched with the positions of the special-shaped cylinder holes on both sides of the product;

[0009] A mounting hole is provided in the middle of the filling block, and limiting holes are provided on both sides of the filling block near the mounting hole; bolts are provided in the mounting holes, and the filling block is connected to the upper clamping plate or the lower clamping plate through the bolts; a limiting pin is provided in the limiting hole, and the filling block is connected to the upper clamping plate or the lower clamping plate through the limiting pin;

[0010] A concave arc surface is provided on one side of the filling block, and a convex arc surface is provided on the other side. The two sides of the concave arc surface are in contact with the two sides of the incomplete arc surface of the special-shaped cylinder hole to form a complete circular hole; the diameter corresponding to the concave arc surface is the same as the diameter corresponding to the incomplete arc surface, and the center of the circle corresponding to the concave arc coincides with the center of the circle corresponding to the incomplete arc surface.

[0011] Furthermore, one side of the upper clamping plate and one side of the lower clamping plate are both provided with a matching portion, and the matching portion matches with the small circular hole in the center hole of the product and is a transition match.

[0012] Furthermore, the end surface of the filling block close to the end surface of the product is at the same height as the end surface of the product.

[0013] Furthermore, the filling block is made of a material consistent with the product.

[0014] Furthermore, the height difference between the support block and the product after assembly is less than 0.015 mm.

[0015] Furthermore, the limiting pins in the limiting holes on both sides of the mounting hole are different, one of which is a cylindrical pin and the other is a diamond pin; wherein the flattening direction of the diamond pin should be perpendicular to the line connecting the centers of the diamond pin and the cylindrical pin.

[0016] Furthermore, the mounting plate is made of aluminum alloy material.

[0017] Furthermore, the support block is composed of a plurality of small support blocks.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The design of the mounting plate and the positioning pin allows the positioning pin to be inserted into the positioning hole, thereby preventing the product from moving left and right. The support block is used to be arranged between the mounting plate and the product and to support the product, which can effectively prevent the positioning hole and the positioning pin from being squeezed and damaged after the product is pressed.

[0020] The stud is fixed on the lower clamping plate, and the hole in the middle of the upper clamping plate can be used to install the stud. A nut is provided on the stud. By screwing the nut, the upper clamping plate can be pushed toward the lower clamping plate, that is, the positions of the upper clamping plate and the lower clamping plate are brought close to each other, so that the upper clamping plate and the lower clamping plate can be locked on the product.

[0021] The filling blocks on the upper and lower plates are used to fill the gaps in the special-shaped cylinder holes on the product so that the special-shaped cylinder holes become simple straight holes. This design can convert the honing of special-shaped cylinder holes into the honing of simple straight holes, which can reduce the difficulty of production. At the same time, the honing process of simple straight holes is more mature and can effectively ensure the accuracy of special-shaped cylinder holes.

[0022] The filling block is detachably connected to the upper clamping plate or the lower clamping plate. The mounting hole provided in the middle of the filling block can be used to fix and lock the filling block to the upper clamping plate or the lower clamping plate by bolts. After the limit hole is provided on the filling block, the rotation of the filling block can be limited by the limit pin. The design of two limit pins and one bolt forms a three-point positioning, which can ensure reliable connection strength while simplifying the connection structure, so that the position of the filling block will not move or rotate during processing, and it can be quickly replaced when it needs to be replaced without affecting the processing progress.

[0023] The special-shaped cylinder hole of the product is a simple straight hole with a regular or irregular opening cut on one side. A concave arc surface is designed on one side of the filling block, and a convex arc surface is designed on the other side. That is, the filling block is a crescent-shaped structure as a whole. The concave arc surface is used to fill the opening of the special-shaped cylinder hole. The design of the convex arc surface makes the filling block uniformly stressed as a whole and not easy to be damaged. The concave arc surface and the inner surface of the special-shaped cylinder hole form a simple straight hole, which ensures the accuracy of the processed special-shaped cylinder hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 for Figure 1 A local enlarged schematic diagram of point A;

[0026] Figure 3 This is a schematic diagram of the structure after the present invention and the product are installed together;

[0027] Figure 4 for Figure 3 A partial enlarged schematic diagram of point B.

[0028] Markings in the figure: 1-mounting plate, 2-support block, 3-locating pin, 4-lower clamping plate, 5-matching part, 6-stud, 7-filling block, 8-upper clamping plate, 9-adjusting block, 10-convex arc surface, 11-limiting hole, 12-concave arc surface, 13-mounting hole, 14-product, 15-special-shaped cylinder hole DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Example

[0031] A honing fixture for machining a special-shaped cylinder bore 15 of an engine cylinder block, used for clamping and positioning a product 14, comprising a fixing member and a positioning member used in conjunction with each other; wherein the fixing member comprises a mounting plate 1, on both sides of which are fixedly connected positioning pins 3 that cooperate with positioning holes on the product 14; a supporting block 2 is also provided between the mounting plate 1 and the product 14;

[0032] Specifically, the position of the mounting plate 1 is fixed, and the positioning pin 3 of the mounting plate 1 is used to cooperate with the positioning hole on the product 14. The specific method is to place the product 14 on the mounting plate 1 and align the positioning hole of the product 14 with the positioning pin 3 and then put it down, so that the positioning pin 3 is inserted into the positioning hole, thereby preventing the product 14 from moving left and right. The support block 2 is used to be arranged between the mounting plate 1 and the product 14 and to support the product 14. Since the positioning hole of the product 14 cooperates with the positioning pin 3, the product 14 will move in the up and down directions, so a cushion block is required to support the product 14. Here, the designed support block 2 acts as a cushion block, which can effectively support the cushion block and effectively prevent the positioning hole and the positioning pin 3 from being squeezed and damaged after the product 14 is pressed.

[0033] The positioning part includes an upper splint 8 and a lower splint 4, and the upper splint 8 and the lower splint 4 are connected by a stud 6; the upper splint 8 and the lower splint 4 are both matched with the center hole of the product 14; a plurality of filling blocks 7 are provided on one side of the upper splint 8 and one side of the lower splint 4, wherein the position of the filling blocks 7 matches the position of the special-shaped cylinder holes 15 on both sides of the product 14.

[0034] Specifically, the stud 6 is fixed on the lower clamping plate 4, and the hole in the middle of the upper clamping plate 8 can pass through the stud 6. A nut is provided on the stud 6. By screwing the nut, the upper clamping plate 8 can be pushed toward the lower clamping plate 4, that is, the positions of the upper clamping plate 8 and the lower clamping plate 4 are close to each other. Specifically, the center hole of the product 14 is not a simple straight hole, but is composed of a large hole and a small hole. Here, the small hole is called a small circular hole. Through this design, the upper clamping plate 8 and the lower clamping plate 4 can be against the outside of the small circular hole. By tightening the nut, the upper clamping plate 8 and the lower clamping plate 4 are close to each other, so that the upper clamping plate 8 and the lower clamping plate 4 can be locked on the product 14. Specifically, the filling blocks 7 on the upper clamping plate 8 and the lower clamping plate 4 are used to fill the gap of the special-shaped cylinder hole 15 on the product 14, so that the special-shaped cylinder hole 15 becomes a simple straight hole. Through this design, the honing of the special-shaped cylinder hole 15 can be converted into the honing of a simple straight hole, which can reduce the difficulty of production. At the same time, the honing process of the simple straight hole is more mature, which can effectively ensure the accuracy of the special-shaped cylinder hole 15.

[0035] A mounting hole 13 is provided in the middle of the filling block 7, and limiting holes 11 are provided on both sides of the filling block 7 near the mounting hole 13; bolts are provided in the mounting hole 13, and the filling block 7 is connected to the upper clamping plate 8 or the lower clamping plate 4 through the bolts; a limiting pin is provided in the limiting hole 11, and the filling block 7 is connected to the upper clamping plate 8 or the lower clamping plate 4 through the limiting pin.

[0036] Specifically, the filling block 7 is detachably connected to the upper clamping plate 8 or the lower clamping plate 4. The mounting hole 13 provided in the middle of the filling block 7 can fix and lock the filling block 7 on the upper clamping plate 8 or the lower clamping plate 4 by bolts. At the same time, it is also necessary to prevent the filling block 7 from rotating after being connected, so two limiting holes 11 are provided on both sides of the mounting hole 13 on the filling block 7. After the limiting holes 11 are provided on the filling block 7, the rotation of the filling block 7 can be limited by limiting pins. The filling block 7 in this embodiment needs to be processed together with the product 14, that is, the filling block 7 can be understood as a part of the product 14, but it is separated from the product 14 after the product 14 is processed. Therefore, it is necessary to ensure that the position of the filling block 7 will not change during the processing, and neither displacement nor rotation is allowed, and displacement or rotation will affect the final processing accuracy of the product 14. The filling block 7 is a consumable part, so the design cannot be too complicated when installing the filling block 7, but the connection relationship of the filling block 7 must be guaranteed. Therefore, the design of two limit pins and a bolt here forms a three-point positioning, which can ensure reliable connection strength while simplifying the connection structure, so that the position of the filling block 7 will not move or rotate during processing, and can be quickly replaced when it needs to be replaced without affecting the processing progress.

[0037] A concave arc surface 12 is provided on one side of the filling block 7, and a convex arc surface 10 is provided on the other side. The two sides of the concave arc surface are in contact with the two sides of the incomplete arc surface of the special-shaped cylinder hole 15 to form a complete circular hole; the diameter corresponding to the concave arc surface is the same as the diameter corresponding to the incomplete arc surface, and the center of the circle corresponding to the concave arc coincides with the center of the circle corresponding to the incomplete arc surface.

[0038] Specifically, the irregular cylinder hole 15 of the product 14 is a simple straight hole with a regular or irregular opening cut on one side. In the traditional processing technology, the opening is cut in advance. For the cylinder hole with an opening, the problem of difficult to control the accuracy will occur during the honing process. In this embodiment, the filling block 7 is designed with a concave arc surface 12 on one side and a convex arc surface 10 on the other side, that is, the filling block 7 is a crescent-shaped structure as a whole, the purpose of which is to facilitate production and processing, and to reduce the volume of the filling block 7. The concave arc surface 12 is used to fill the opening of the irregular cylinder hole 15, in other words, to fill the cut part of the irregular cylinder hole 15, so that the irregular cylinder hole 15 is a simple straight hole. The design of the convex arc surface 10 makes the filling block 7 uniformly stressed as a whole and not easy to be damaged. Even if the filling block 7 is firmly fixed on the upper clamping plate 8 and the lower clamping plate 4, it is still not possible to completely ensure that the position of the filling block 7 changes during honing. The position of the filling block 7 may also change due to the rotation of the upper clamping plate 8 and the lower clamping plate 4. Therefore, in this embodiment, a transition section is designed between the concave arc surface 12 and the convex arc surface 10, and the transition section can contact the inner wall of the opening, that is, the filling block 7 can be engaged with the opening. After the filling block 7 is engaged with the opening, the concave arc surface 12 and the inner surface of the special-shaped cylinder hole 15 form a simple straight hole, and the engagement method makes the gap between the filling block 7 and the opening very small, generally less than 0.01mm. During processing, the filling block 7 and the special-shaped cylinder hole 15 can basically be regarded as a whole, thereby ensuring the accuracy of the processed special-shaped cylinder hole 15.

[0039] In a preferred embodiment, a connection groove is designed on the inner wall of the opening of the special-shaped cylinder hole 15, and a connection strip is designed on the transition section of the filling block 7, and the connection strip cooperates with the connection. This design can achieve a true snap connection between the filling block 7 and the special-shaped cylinder hole 15 on the cylinder body, thereby ensuring that the position of the filling block 7 will not change.

[0040] In a preferred embodiment, a matching portion 5 is provided on one side of the upper clamping plate 8 and one side of the lower clamping plate 4, and the matching portion 5 matches with the small circular hole in the center hole of the product 14 and is a transition match. The center hole of the product 14 includes a large hole and a small circular hole, and the upper clamping plate 8 and the lower clamping plate 4 are located in the large hole but blocked outside the small circular hole. In order to further improve the connection strength between the upper clamping plate 8 and the lower clamping plate 4 and the product 14, a matching portion 5 is designed on one side of the upper clamping plate 8 and one side of the lower clamping plate 4, and the matching portion 5 is a cylindrical convex structure, and the matching portion 5 is used to extend into the small circular hole and match with the small circular hole. It is equivalent to realizing the shaft hole match, thereby ensuring the connection relationship between the positioning member and the product 14, preventing the upper clamping plate 8 and the lower clamping plate 4 from moving up and down after the connection, and at the same time, when the matching portion 5 is designed and the upper clamping plate 8 and the lower clamping plate 4 are locked by tightening the nut, the upper clamping plate 8 or the lower clamping plate 4 can be tilted to cause the upper clamping plate 8 or the lower clamping plate 4 to deform.

[0041] In order to ensure that the upper clamping plate 8 and the lower clamping plate 4 can be quickly disassembled and assembled on the product 14, the bottom matching part 5 of the filling block 7 and the small round hole in the center hole of the product 14 should adopt transition fit. For easy disassembly and assembly, the size of the matching part 5 and the small round hole is generally zero, and the tolerance is also close to zero, so when processing or selecting the matching part 5, it is also as close to zero as possible. For example, the matching part 5 is generally between the zero and negative two lines, which is very easy during the assembly process.

[0042] In a preferred embodiment, the end face of the filling block 7 close to the end face of the product 14 is at the same height as the end face of the product 14. The filling block 7 has a guiding function: the honing process uses multiple oilstones installed on the honing head, and the oilstones are expanded radially by the expansion mechanism to press them against the wall of the workpiece hole. At the same time, the main shaft of the honing machine drives the honing head to rotate while making linear up and down reciprocating motion. The honing head is floating between the honing head and the main shaft of the machine tool, and the honing head is guided by the wall of the workpiece hole during processing. When there is a large crack in the wall of the workpiece hole, the actual position of the honing head will deviate from the required position, resulting in shape errors in the processed product.

[0043] In a preferred embodiment, the filling block 7 is made of the same material as the product 14. The same material is used to facilitate processing and prevent different grinding degrees from occurring during honing due to different material properties, thereby affecting the processing accuracy of the special-shaped hole. In mechanical processing, the hardness of the material affects the ability to cut and be cut. The harder the material, the more difficult it is to cut. If the filling block 7 is made of a different material from the product 14, it will cause uneven cutting, thereby affecting the processing accuracy.

[0044] Therefore, using the filling block 7 made of the same material can effectively improve the machining accuracy of the special-shaped hole.

[0045] In a preferred embodiment, the height difference between the support block and the product is less than 0.015 mm.

[0046] In a preferred embodiment, the limit pins in the limit holes 11 on both sides of the mounting hole 13 are different, one of which is a cylindrical pin and the other is a diamond pin. The flattening direction of the diamond pin should be perpendicular to the line connecting the centers of the diamond pin and the cylindrical pin. That is, the positioning method of "one side and two pins" is adopted, and the positioning pins 3 are respectively designed as a cylindrical pin and a diamond pin positioning product 14. In the "one side and two pins" positioning method, the "one side" completes the positioning in the axial direction, limiting two rotations and one movement. Three degrees of freedom. The cylindrical pin limits two movements. The diamond pin limits one rotation. The diamond pin is used to prevent over-positioning. In the "one side and two pins" positioning method, the cutting direction of the diamond pin should be perpendicular to the line connecting the centers of the diamond pin and the cylindrical pin.

[0047] In a preferred embodiment, the mounting plate 1 is made of aluminum alloy material to reduce the weight of the mounting plate 1 and facilitate the disassembly and assembly of the product 14 .

[0048] In a preferred embodiment, the support block 2 is composed of a plurality of support blocks. Specifically, in this embodiment, the support block 2 is composed of two support blocks, an eccentric hole is provided on the support block, a bolt is provided in the eccentric hole, and the two support blocks are connected together by the bolts. The design of the eccentric hole enables the support block 2 to adjust the height position through the combination of multiple support blocks 2, and the overall inclination angle of the support block 2 can be adjusted by rotation, that is, the position of the uppermost support block 2 is adjusted, so that the support block 2 can stably support the product 14.

[0049] In a preferred embodiment, the mounting plate 1 is connected with an adjustment block 9 by bolts, and the positioning pin 3 is fixed to the adjustment block 9. Specifically, the positioning pin 3 is connected to the adjustment block 9 by bolts. The height position of the positioning pin 3 can be adjusted by replacing the adjustment block 9 with different heights. By adjusting the height position of the positioning pin 3, the positioning pin 3 can stably cooperate with the positioning hole on the product 14.

[0050] In the description of the present invention, it is necessary to understand that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0051] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0052] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A honing fixture for machining special-shaped cylinder bores of an engine cylinder block, used for clamping and positioning a product (14), Features: It comprises a fixing member and a positioning member for use together; wherein the fixing member comprises a mounting plate (1), and positioning pins (3) are fixedly connected to the two sides of the mounting plate and are matched with positioning holes on the product (14); a support block (2) is also arranged between the mounting plate (1) and the product (14); The positioning member comprises an upper clamping plate (8) and a lower clamping plate (4), wherein the upper clamping plate (8) and the lower clamping plate (4) are connected via a stud (6); the upper clamping plate (8) and the lower clamping plate (4) are both matched with the central hole of the product (14); a plurality of filling blocks (7) are provided on one side of the upper clamping plate (8) and one side of the lower clamping plate (4), wherein the positions of the filling blocks (7) are matched with the positions of the special-shaped cylinder holes (15) on both sides of the product (14); A mounting hole (13) is provided in the middle of the filling block (7), and limiting holes (11) are provided on both sides of the filling block (7) close to the mounting hole (13); a bolt is provided in the mounting hole (13), and the filling block (7) is connected to the upper clamping plate (8) or the lower clamping plate (4) through the bolt; a limiting pin is provided in the limiting hole (11), and the filling block (7) is connected to the upper clamping plate (8) or the lower clamping plate (4) through the limiting pin; A concave arc surface (12) is provided on one side of the filling block (7), and a convex arc surface (10) is provided on the other side, and the two sides of the concave arc surface are in contact with the two sides of the incomplete arc surface of the special-shaped cylinder hole (15) to form a complete circular hole; the diameter corresponding to the concave arc surface is the same as the diameter corresponding to the incomplete arc surface, and the center of the circle corresponding to the concave arc coincides with the center of the circle corresponding to the incomplete arc surface.

2. A honing fixture for machining special-shaped cylinder bores of an engine block according to claim 1, Features: One side of the upper clamping plate (8) and one side of the lower clamping plate (4) are both provided with a matching portion (5), and the matching portion (5) matches with the small circular hole in the center hole of the product (14) and is a transition match.

3. The honing fixture for machining special-shaped cylinder bores of an engine block according to claim 1, Features: The end surface of the filling block (7) close to the end surface of the product (14) is at the same height as the end surface of the product (14).

4. The honing fixture for machining special-shaped cylinder bores of an engine block according to claim 1, Features: The filling block (7) is made of a material consistent with the product (14).

5. The honing fixture for machining special-shaped cylinder bores of an engine cylinder block according to claim 1, Features: After assembly, the height difference between the support block (2) and the product (14) is less than 0.015 mm.

6. The honing fixture for machining special-shaped cylinder bores of an engine cylinder block according to claim 1, Features: One of the limiting pins in the limiting holes (11) on both sides of the mounting hole (13) is a cylindrical pin and the other is a diamond pin; wherein the flattening direction of the diamond pin should be perpendicular to the line connecting the centers of the diamond pin and the cylindrical pin.

7. The honing fixture for machining special-shaped cylinder bores of an engine block according to claim 1, Features: The mounting plate (1) is made of aluminum alloy material.

8. The honing fixture for machining special-shaped cylinder bores of an engine cylinder block according to claim 1, Features: The support block (2) is formed by combining a plurality of small support blocks.

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