A fixture with centering and positioning mechanism for machining an engine cylinder

Abstract

The present invention discloses a clamp for processing an engine cylinder block with a centering and positioning mechanism, comprising a clamp body consisting of a vertical bracket and a first horizontal bracket and a second horizontal bracket arranged on both sides of the vertical bracket; a pressing mechanism for pressing the cylinder block between the first horizontal bracket and the second horizontal bracket is arranged on the first horizontal bracket; the centering and positioning mechanism comprises a centering mechanism and an upper positioning mechanism, wherein the centering mechanism comprises a guide pin, a linkage shaft and a positioning shaft, wherein the guide pin is connected to a first driving device to realize telescopic movement, and the linkage shaft is rotationally connected to the vertical bracket; a first recessed portion is provided on the side of the guide pin away from the first driving device; a first protruding portion is provided on one side of the linkage shaft, and a second protruding portion is provided on the other side; linkage shafts are provided on both sides of the guide pin, wherein the first protruding portion and the first recessed portion are interference fit; this structure can quickly fix the position of the cylinder block.

Description

Technical Field

[0001] The invention belongs to the technical field of engine cylinder processing, and in particular relates to an engine cylinder processing fixture with a centering and positioning mechanism. Background Art

[0002] As a key engine component, the cylinder block undergoes both roughing and finishing. Roughing requires datum positioning using the workpiece blank, followed by finishing datums to ensure the correct positioning, dimensions, and accuracy of all cylinder block surfaces and bores. Traditionally, cylinder block machining centers the workpiece blank's bore, and clamping can be used to center the workpiece through the bore. However, according to the drawing requirements, the workpiece blank is centered using a water jacket. However, due to the extremely limited space in the water jacket, a tensioning mechanism cannot be used.

[0003] The cylinder body is a special-shaped part, and the positional relationship of multiple surfaces and holes needs to be considered to avoid interference during clamping and processing. The selection of the fixture must also consider the efficiency of clamping in order to meet the needs of rapid clamping during mass production. It is difficult for the fixtures in the existing technology to meet the various usage requirements mentioned above at the same time.

[0004] Patent application number CN201220507267.6 discloses an engine cylinder block machining fixture comprising a clamping body, a bottom support plate, a bottom positioning pin, and a bottom clamping mechanism corresponding to the clamping position of the bottom surface of the engine cylinder block to be machined, and a top support plate, a top positioning pin, and a top clamping mechanism corresponding to the clamping position of the top surface of the engine cylinder block to be machined. The bottom and top clamping mechanisms are detachably connected to the clamping body. Using this fixture is slow when securing the cylinder block. Summary of the Invention

[0005] The object of the present invention is to provide a clamp with a centering and positioning mechanism for machining an engine cylinder block, so as to solve the problems mentioned in the background art that the clamp in the prior art is slow to clamp and difficult to perform centering and positioning by tensioning.

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

[0007] A fixture for machining an engine cylinder block with a centering and positioning mechanism includes a fixture body consisting of a vertical bracket and a first and a second transverse bracket disposed on both sides of the vertical bracket; the first transverse bracket is provided with a pressing mechanism for pressing the cylinder block between the first and second transverse brackets;

[0008] The first transverse bracket is provided with a centering positioning mechanism and a pressing mechanism for pressing the cylinder body, and the second transverse bracket is provided with a supporting positioning mechanism for supporting and positioning the cylinder body;

[0009] The centering positioning mechanism includes a centering mechanism and an upper positioning mechanism, wherein the centering mechanism includes a guide pin, a linkage shaft, and a positioning shaft, wherein the guide pin is connected to the first drive device to achieve telescopic movement, and the linkage shaft is rotatably connected to the vertical bracket; a first recessed portion is provided on a side of the guide pin away from the first drive device;

[0010] A first protrusion is provided on one side of the linkage shaft, and a second protrusion is provided on the other side; a linkage shaft is provided on both sides of the guide pin, wherein the first protrusion is interference-fitted with the first recess; a connecting sleeve is fixedly connected to both sides of the first transverse bracket near the middle portion, and a positioning shaft is movably connected in each connecting sleeve; a first claw is provided on one side of the positioning shaft, and a second recess is provided on the other side, and the second protrusion is engaged with the second recess;

[0011] The upper positioning mechanism includes a fixed shaft, a pull pin, an I-shaft and a rotating ear; the fixed shaft is fixedly connected to both sides of the first transverse bracket through a fixed plate, the rotating ear is rotatably connected to the fixed shaft, and a second claw is provided on the rotating ear; the pull pin is connected to the first transverse bracket through a second driving device, and the second driving device is used to drive the pull pin to extend and retract; the I-shaft is fixed to the side of the pull pin away from the second driving device; the middle part of the I-shaft is interference fit with the rotating ear.

[0012] Furthermore, a first pin sleeve is sleeved on the outer side of the guide pin, and the first pin sleeve is fixedly connected to the first transverse bracket; a second pin sleeve is sleeved on the outer side of the pull pin, and the second pin sleeve is fixedly connected to the first transverse bracket.

[0013] Furthermore, the first driving device and the second driving device adopt hydraulic cylinders.

[0014] Furthermore, the clamping mechanism includes a hydraulic cylinder and a clamping rod, and the clamping rod is processed from a bar material of φ40 or above; in order to prevent iron filings from adhering to the clamping rod and affecting product quality, the clamping part of the clamping rod needs to be cut.

[0015] Furthermore, the support and positioning mechanism includes a support block, a support rod and a pressure plate; wherein, the support block is fixed on both sides of the second transverse bracket, and the support block is used to position the blank surface of the cylinder crankshaft hole; the support rod is fixed on the second transverse bracket, and the support rod is used to position the oil hole of the cylinder; a pressure plate is also connected next to the support block, and the pressure plate is used to press the cylinder.

[0016] Furthermore, a third claw is provided on the pressing plate, the pressing plate is connected to the second transverse bracket through the support frame and the pressing plate is hinged to the support frame; the other side of the pressing plate is connected to the third driving device, and the third driving device is used to drive the pressing plate to rotate.

[0017] Furthermore, a guide plate is fixedly connected to the second transverse bracket on the outer side of the support block.

[0018] Furthermore, a pre-positioning plate is fixedly connected to one side of the support block on the second transverse bracket; the cross section of the pre-positioning plate is a triangular structure.

[0019] Furthermore, a lifting mechanism is connected to the second transverse bracket, and the lifting mechanism includes a lifting plate, which is connected to the second transverse bracket through a fourth driving device, and the fourth driving device is used to control the lifting plate to rise and fall; rollers are rotatably connected on both sides of the lifting plate through needle bearings.

[0020] Furthermore, an auxiliary supporting mechanism is provided on the vertical bracket.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] This solution uses the centering mechanism to quickly locate the cylinder hole of the cylinder body, so that the cylinder body can be quickly installed, which is convenient for the subsequent rapid use of the blank surface positioning mechanism to locate the blank surface of the cylinder body. After realizing the functions of rapid positioning and clamping, it is also beneficial to improve production efficiency.

[0023] The use of the first, second and third jaws to achieve clamping is beneficial to maintaining the stability of the cylinder body after positioning, and to avoid movement of the cylinder body due to errors during subsequent operations. At the same time, the design of the jaws can tighten the blank cylinder hole, thereby achieving centering positioning using the tightened cylinder hole.

[0024] The centering mechanism uses a first drive device to move the guide pin up and down. As the guide pin moves, it rotates the linkage shaft. To ensure rotation of the linkage shaft, the first protrusion and the first recess require an interference fit. This design also limits the linkage shaft's rotation to a specific range. As the linkage shaft rotates, the second protrusion on the linkage shaft shifts the inner wall of the second recess, causing the positioning shaft to move within the connecting sleeve. This movement of the positioning shaft causes the first claw on the positioning shaft to clamp onto the cylinder bore of the cylinder block. Using this claw to tighten the cylinder bore of the rough cylinder block facilitates tightening the cylinder bore.

[0025] The use of a rotary clamping method ensures that the clamped position does not change, while maintaining a strong clamping force and ensuring that the position of the cylinder body does not change after clamping. Furthermore, this clamping method only requires the first drive device to pull the guide pin, making the entire clamping process fast and easy to control. This design enables rapid clamping. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 A schematic diagram of the centering mechanism structure of the present invention;

[0028] Figure 3 It is a structural schematic diagram of the upper positioning mechanism and the pressing mechanism of the present invention;

[0029] Figure 4 This is a schematic structural diagram of the I-shaft and the rotating ear of the present invention;

[0030] Figure 5 It is a structural schematic diagram of the support and positioning mechanism of the present invention;

[0031] Figure 6 for Figure 5 A local enlarged schematic diagram of point A.

[0032] Markings in the figure: 1-first transverse bracket, 2-second transverse bracket, 3-vertical bracket, 4-auxiliary support mechanism, 6-centering positioning mechanism, 7-first pin sleeve, 8-guide pin, 9-connecting sleeve, 10-second protrusion, 11-second recess, 12-linking shaft, 13-first claw, 14-positioning shaft, 15-first protrusion, 16-first recess, 17-pull pin, 18-second pin sleeve, 19-I-shaft, 20-turn ear, 21-second claw, 22-fixed shaft, 23-pressing rod, 24-support block, 25-pre-positioning plate, 26-guide plate, 27-support rod, 28-lifting plate, 29-roller, 30-pressure plate, 31-support frame, 32-third claw. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0034] Example

[0035] A fixture for machining an engine cylinder block with a centering and positioning mechanism includes a fixture body consisting of a vertical bracket 3 and a first transverse bracket 1 and a second transverse bracket 2 disposed on either side of the vertical bracket 3; a pressing mechanism is disposed on the first transverse bracket 1 for pressing the cylinder block between the first transverse bracket 1 and the second transverse bracket 2;

[0036] The first transverse bracket 1 is provided with a centering positioning mechanism 6 and a pressing mechanism for pressing the cylinder body, and the second transverse bracket 2 is provided with a supporting positioning mechanism for supporting and positioning the cylinder body;

[0037] The centering and positioning mechanism 6 includes a centering mechanism and an upper positioning mechanism. The centering mechanism is used to limit the position of the cylinder body toward the front end, while the upper positioning mechanism is used to limit the position of the cylinder body toward the left and right sides. The centering mechanism includes a guide pin 8, a linkage shaft 12, and a positioning shaft 14. The guide pin 8 is connected to the first drive device to achieve telescopic movement, and the linkage shaft 12 is rotationally connected to the vertical bracket 3. A first recess 16 is provided on the side of the guide pin 8 away from the first drive device.

[0038] A first protrusion 15 is provided on one side of the linkage shaft 12, and a second protrusion 10 is provided on the other side; a linkage shaft 12 is provided on both sides of the guide pin 8, wherein the first protrusion 15 is interference-fitted with the first recess 16; a connecting sleeve 9 is fixedly connected to both sides of the first transverse bracket 1 near the middle portion, and a positioning shaft 14 is movably connected in the connecting sleeve 9. A first claw 13 is provided on one side of the positioning shaft 14, and a second recess 11 is provided on the other side. The second protrusion 10 is engaged and connected with the second recess 11;

[0039] In actual use, the first drive device drives the guide pin 8 to move up and down. As the guide pin 8 moves, the guide pin 8 drives the linkage shaft 12 to rotate. To ensure the rotation of the linkage shaft 12, the first protrusion 15 and the first recess 16 need to have an interference fit. At the same time, this design also ensures that the linkage shaft 12 can only rotate within a certain range. As the linkage shaft 12 rotates, the second protrusion 10 on the linkage shaft 12 moves the inner wall of the second recess 11, causing the positioning shaft 14 to move within the connecting sleeve 9. The movement of the positioning shaft 14 causes the first claw 13 on the positioning shaft 14 to clamp the cylinder bore of the cylinder body.

[0040] The upper positioning mechanism includes a fixed shaft 22, a pull pin 17, an I-shaped shaft 19, and a rotating lug 20. The fixed shaft 22 is fixedly connected to both sides of the first transverse bracket 1 via a fixed plate. The rotating lug 20 is rotatably connected to the fixed shaft 22 and is provided with a second claw 21. The pull pin 17 is connected to the first transverse bracket 1 via a second drive device, which is used to drive the pull pin 17 to extend and retract. The I-shaped shaft 19 is fixed to the side of the pull pin 17 away from the second drive device. The middle portion of the I-shaped shaft 19 has an interference fit with the rotating lug 20. The rotating lug 20 includes a central rotation zone, with a clamping zone provided on one side of the rotation zone and a toggle zone provided on the other side. The second claw 21 is provided on the toggle drive, and the clamping zone has an interference fit with the middle portion of the I-shaped shaft 19.

[0041] A turning ear 20 is installed on the I-shaft 19, and a second clamping claw 21 is installed on the turning ear 20. The fixture tightens the workpiece blank surface through the second clamping claws 21 on both sides to limit the product. Due to factors such as burrs on the blank surface, the tightening position of the blank is uncertain, and the clamping claws need to have a certain floating amount, so the I-shaft 19 structure is adopted.

[0042] During actual use, the second driving device pulls the pull pin 17 to move, and the movement of the pull pin 17 drives the I-shaft 19 to move. The movement of the I-shaft 19 will pull the clamping area to move. The movement of the clamping area causes the rotating area to rotate around the fixed axis 22, so that the second claw 21 on the dialing area clamps the cylinder body, thereby fixing the position of the cylinder body.

[0043] In a preferred embodiment, a first pin sleeve 7 is sleeved around the outer side of guide pin 8 and fixedly connected to first transverse bracket 1. A second pin sleeve 18 is sleeved around the outer side of pull pin 17 and fixedly connected to first transverse bracket 1. First pin sleeve 7 is provided to prevent guide pin 8 from bending under stress and can transfer some of the radial force acting on guide pin 8, thereby preventing bending. Second pin sleeve 18 is provided to prevent pull pin 17 from bending under stress and can transfer some of the radial force acting on pull pin 17, thereby preventing bending.

[0044] In a preferred embodiment, the first driving device and the second driving device are hydraulic cylinders that can provide a stable and powerful driving force, thereby ensuring that the first claw 13 and the second claw 21 can stably and firmly fix the position of the cylinder body.

[0045] In a preferred embodiment, the clamping mechanism comprises a hydraulic cylinder and a clamping rod 23. The clamping rod 23 is machined from bar stock with a diameter of 40 mm or larger. To prevent iron filings from adhering to the clamping rod and affecting product quality, the clamping portion of the clamping rod 23 is cut. To ensure uniform clamping force on the cylinder body, four clamping rods 23 are provided, positioned at the four corners of a rectangle similar to the cylinder body. Each clamping rod 23 is driven by a hydraulic cylinder. The four clamping rods 23 provide stable clamping of the cylinder body, preventing the cylinder body from shifting position during machining, thereby ensuring machining accuracy.

[0046] In a preferred embodiment, the support and positioning mechanism includes support blocks 24, support rods 27, and a pressure plate 30. Support blocks 24 are fixed to both sides of the second transverse bracket 2 and are used to locate the rough surface of the cylinder crankshaft bore. Support rods 27 are fixed to the second transverse bracket 2 and are used to locate the cylinder oil hole. A pressure plate 30 is also connected to the side of the support blocks 24 to compress the cylinder. Support blocks 24 are used to locate the rough surface of the cylinder crankshaft bore and to position the cylinder vertically. To ensure product dimensions meet requirements, the two support blocks 24 should be ground to the same height.

[0047] In a preferred embodiment, the pressing plate 30 is provided with a third claw 32. The pressing plate 30 is connected to the second transverse support 2 via a support frame 31 and is hingedly connected to the support frame 31. The other side of the pressing plate 30 is connected to a third drive device, which is used to drive the pressing plate 30 to rotate. The pressing plate 30 is driven by the third drive device (such as a cylinder). The cylinder's telescopic rod drives the pressing plate 30 to rotate, thereby clamping the cylinder body with the third claw 32 on the pressing plate 30, further improving the tightening ability of the cylinder body.

[0048] In a preferred embodiment, a guide plate 26 is fixedly connected to the outer side of the support block 24 on the second transverse bracket 2. In order to facilitate the clamping and positioning of the cylinder body, the guide plate 26 is provided. The width of the guide plate 26 matches the cylinder hole on the cylinder body, so that the cylinder hole of the cylinder body is aligned with the guide plate 26 when the cylinder body is clamped, thereby preventing the cylinder body from rotating or other displacements when clamping the cylinder body, thereby facilitating subsequent clamping and alignment.

[0049] In a preferred embodiment, a pre-positioning plate 25 is fixed to one side of the support block 24 of the second transverse bracket 2. The pre-positioning plate 25 has a triangular cross-section. To facilitate product clamping, a pre-positioning mechanism is provided. To prevent interference with the product, a clearance between the pre-positioning mechanism and the product is typically set to >0.5mm. The pre-positioning plate 25 allows for preliminary determination of the cylinder's position before clamping.

[0050] In a preferred embodiment, a lifting mechanism is connected to the second transverse bracket 2, and the lifting mechanism includes a lifting plate 28. The lifting plate 28 is connected to the second transverse bracket 2 via a fourth drive device, and the fourth drive device is used to control the raising and lowering of the lifting plate 28. The lifting plate 28 is rotatably connected to rollers 29 on both sides via needle bearings. In order to facilitate the placement of the cylinder body on the second transverse bracket 2, a lifting mechanism is provided. In actual use, the lifting plate 28 is lifted by the fourth drive device, and then the cylinder body is placed on the lifting plate 28. The rollers 29 on both sides of the lifting plate 28 can easily push the cylinder body, thereby facilitating the rapid pushing of the cylinder body to the approximate position, and facilitating the subsequent clamping and fixing of the cylinder body.

[0051] In a preferred embodiment, an auxiliary support mechanism 4 is provided on the vertical bracket 3. The auxiliary support mechanism 4 is used to block the side of the cylinder body and to prevent the cylinder body from being deformed by force when milling the surface. Since the cutting force during surface machining is large enough to affect the machining accuracy and the cutting process will generate vibration, relying solely on the support block (24) cannot ensure the positioning accuracy requirements. For example, the thin wall part of the product will be deformed by the cutting force. The auxiliary support can increase the positioning stability, increase the support rigidity of the workpiece or withstand the cutting force, prevent the workpiece from being deformed by the tool during machining, and avoid vibration during product machining, thereby affecting the machining accuracy. The auxiliary support contacts the workpiece only after the workpiece is positioned. The auxiliary support has the same support effect on the workpiece as the support block (24), provides a reaction force to the pressing force or cutting force, and provides an additional support point without affecting the plane positioning.

[0052] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0053] In the present invention, unless otherwise clearly stipulated and limited, the terms "install", "set", "connect", "fix", "screw" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; 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.

[0054] While 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 invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A clamp for machining an engine cylinder block with a centering and positioning mechanism, comprising a clamp body consisting of a vertical bracket (3) and a first transverse bracket (1) and a second transverse bracket (2) arranged on both sides of the vertical bracket (3); a pressing mechanism for pressing the cylinder block between the first transverse bracket (1) and the second transverse bracket (2) is provided on the first transverse bracket (1); Its characteristics are: The first transverse bracket (1) is provided with a centering positioning mechanism (6) and a pressing mechanism for pressing the cylinder body, and the second transverse bracket (2) is provided with a supporting positioning mechanism for supporting and positioning the cylinder body; The centering positioning mechanism (6) includes a centering mechanism and an upper positioning mechanism, wherein the centering mechanism includes a guide pin (8), a linkage shaft (12) and a positioning shaft (14), wherein the guide pin (8) is connected to a first drive device to achieve telescopic movement, and the linkage shaft (12) is rotatably connected to the vertical bracket (3); a first recessed portion (16) is provided on a side of the guide pin (8) away from the first drive device; A first protrusion (15) is provided on one side of the linkage shaft (12), and a second protrusion (10) is provided on the other side; a linkage shaft (12) is provided on both sides of the guide pin (8), wherein the first protrusion (15) and the first recess (16) are interference-fitted; a connecting sleeve (9) is fixedly connected to both sides of the first transverse bracket (1) near the middle portion, and a positioning shaft (14) is movably connected in the connecting sleeve (9); a first claw (13) is provided on one side of the positioning shaft (14), and a second recess (11) is provided on the other side, and the second protrusion (10) is cooperatively connected with the second recess (11); The upper positioning mechanism comprises a fixed shaft (22), a pull pin (17), an I-shaped shaft (19) and a rotating ear (20); the fixed shaft (22) is fixedly connected to both sides of the first transverse bracket (1) through a fixed plate, the rotating ear (20) is rotatably connected to the fixed shaft (22), and a second clamping claw (21) is provided on the rotating ear (20); the pull pin (17) is connected to the first transverse bracket (1) through a second driving device, and the second driving device is used to drive the pull pin (17) to extend and retract; the I-shaped shaft (19) is fixedly connected to the side of the pull pin (17) away from the second driving device; the middle part of the I-shaped shaft (19) is interference fit with the rotating ear (20).

2. The engine cylinder block processing fixture with centering and positioning mechanism according to claim 1, characterized in that: The outer side of the guide pin (8) is sleeved with a first pin sleeve (7), which is fixedly connected to the first transverse bracket (1); the outer side of the pull pin (17) is sleeved with a second pin sleeve (18), which is fixedly connected to the first transverse bracket (1).

3. The engine cylinder block processing fixture with centering and positioning mechanism according to claim 1, characterized in that: The first driving device and the second driving device adopt hydraulic cylinders.

4. The engine cylinder block processing fixture with centering and positioning mechanism according to claim 1, characterized in that: The pressing mechanism comprises a hydraulic oil cylinder and a pressing rod (23). The pressing rod (23) is processed from rods with a diameter of φ40 or above. The pressing portion of the pressing rod (23) needs to be cut.

5. The engine cylinder block processing fixture with centering and positioning mechanism according to claim 1, characterized in that: The support and positioning mechanism comprises a support block (24), a support rod (27) and a pressure plate (30); wherein the support block (24) is fixedly connected to both sides of the second transverse bracket (2), and the support block (24) is used to position the rough surface of the crankshaft hole of the cylinder body; the support rod (27) is fixedly connected to the second transverse bracket (2), and the support rod (27) is used to position the oil hole of the cylinder body; and a pressure plate (30) is also connected next to the support block (24), and the pressure plate (30) is used to press the cylinder body.

6. The engine cylinder block processing fixture with centering and positioning mechanism according to claim 5, characterized in that: A third claw (32) is provided on the pressing plate (30), the pressing plate (30) is connected to the second transverse bracket (2) through the support frame (31), and the pressing plate (30) and the support frame (31) are hinged; the other side of the pressing plate (30) is connected to the third driving device, and the third driving device is used to drive the pressing plate (30) to rotate.

7. The engine cylinder block processing fixture with centering and positioning mechanism according to claim 5, characterized in that: A guide plate (26) is fixedly connected to the second transverse bracket (2) on the outer side of the support block (24).

8. The fixture for machining an engine cylinder block with a centering and positioning mechanism according to claim 1, characterized in that: A pre-positioning plate (25) is fixedly connected to one side of the support block (24) on the second transverse bracket (2); the cross section of the pre-positioning plate (25) is a triangular structure.

9. The engine cylinder block processing fixture with centering and positioning mechanism according to claim 1, characterized in that: The second transverse bracket (2) is connected to a lifting mechanism, which includes a lifting plate (28). The lifting plate (28) is connected to the second transverse bracket (2) via a fourth driving device, and the fourth driving device is used to control the lifting plate (28) to rise and fall; rollers (29) are rotatably connected to both sides of the lifting plate (28) via needle bearings.

10. The engine cylinder block processing fixture with centering and positioning mechanism according to claim 1, characterized in that: The second transverse support (2) and the vertical support (3) are both provided with auxiliary support mechanisms (4); the auxiliary support mechanisms (4) contact the workpiece after the workpiece is positioned, and the auxiliary support mechanisms (4) support the workpiece and provide a reaction force to the pressing force or cutting force.

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