CN117102998A - High-precision crankshaft cylindrical grinding machine - Google Patents

Abstract

The application relates to the field of workpiece polishing, in particular to a high-precision crankshaft cylindrical grinding machine, which comprises a machine body, a clamping main shaft arranged on the machine body and used for clamping one end of a crankshaft, and a polishing main body arranged on the machine body and used for polishing the outer circle of one end of the crankshaft fixed by the clamping main shaft.

Description

High-precision crankshaft cylindrical grinding machine

Technical Field

The application relates to the field of workpiece polishing, in particular to a high-precision crankshaft cylindrical grinding machine.

Background

A small-size crankshaft is used in the refrigerator compressor, and the workpiece of the crankshaft is small in size and high in working condition precision requirement, so that the precision requirement is high when the crankshaft is subjected to excircle polishing.

In order to realize high-precision polishing of the crankshaft, a numerically controlled crankshaft crank cylindrical grinder with the publication number of CN201214201Y is required to be used for cylindrical polishing, for example, one end of the crankshaft is clamped in an eccentric clamp on a main shaft, so that the crankshaft rotates around the axis of one end to be processed, the main shaft can move along the axial direction of the main shaft, a grinding carriage capable of moving along the radial direction of the main shaft is arranged on a lathe bed, and the grinding carriage drives a grinding wheel to move towards the outer circle of one end of the crankshaft so as to realize cylindrical polishing.

For the related art, because the two ends of the crankshaft are required to be polished and the two ends of the crankshaft are eccentrically arranged, the crankshaft is required to be taken down and placed in another grinding machine to polish the other end after one end is polished, so that the crankshaft is very inconvenient to process.

Disclosure of Invention

In order to facilitate polishing of two ends of a crankshaft, the application provides a high-precision crankshaft cylindrical grinding machine.

The application provides a high-precision crankshaft cylindrical grinding machine which adopts the following technical scheme.

The utility model provides a high accuracy bent axle cylindrical grinder, includes the lathe bed, locates the lathe bed and carries out the centre gripping main shaft of centre gripping to bent axle one end, locates the lathe bed and can carry out the main part of polishing to the bent axle one end excircle that is fixed by the centre gripping main shaft, the lathe bed is equipped with the centre gripping countershaft that accomplishes one end to the bent axle is polished to the bent axle that is fixed by the centre gripping countershaft, and the lathe bed is equipped with the vice body of polishing that carries out the excircle to the bent axle that is fixed by the centre gripping countershaft, and the circular rotation orbit that the bent axle one end that the centre gripping main shaft centre gripping was rotated around centre gripping main shaft axis of rotation formed is the swivel, and centre gripping countershaft axial and centre gripping main shaft axial are consistent, and the straight line that the centre gripping countershaft pivot was located is through the swivel.

Through adopting above-mentioned technical scheme for after the bent axle one end is accomplished polishing, the centre gripping countershaft rotates to established position department, makes the axis of centre gripping main shaft align in the centre gripping countershaft and is used for the position department of centre gripping bent axle, then centre gripping main shaft and centre gripping countershaft are close to mutually, so that the bent axle shifts to centre gripping countershaft department, then carries out the polishing of the remaining one end of bent axle by polishing the vice body, so that accomplish the operation of polishing comparatively fast to bent axle both ends, promote the holistic polishing efficiency of bent axle.

Optionally, the position department that keeps away from each of centre gripping countershaft and centre gripping main shaft and carries out the centre gripping to the bent axle has all been seted up the position, and the lathe bed is equipped with the detection frame, and the detection frame has two and can emit the light beam and the range finding piece of the position of each position finding of centre gripping countershaft and centre gripping main shaft of one-to-one correspondence.

By adopting the technical scheme, the clamping auxiliary shaft and the clamping main shaft can rotate at most by an angle not exceeding one circle, so that the clamping auxiliary shaft and the clamping main shaft can quickly finish alignment adjustment.

Optionally, the positioning holes are inclined, and the openings of the positioning holes at the end faces of the clamping main shaft or the clamping auxiliary shaft are far away from the axes of the corresponding clamping main shaft or clamping auxiliary shaft.

By adopting the technical scheme, even if cutting fluid enters the positioning hole during polishing, the cutting fluid in the positioning hole is thrown out due to the rotation of the clamping main shaft or the clamping auxiliary shaft, so that a large amount of cutting fluid is not easy to remain in the positioning hole, and the detection of the ranging piece on the positioning hole is not easy to influence.

Optionally, the positioning hole is internally connected with a protruding block capable of partially exposing the positioning hole in a sliding manner along the axis direction of the positioning hole, the protruding block is fixedly connected with a spring block which is connected in the clamping auxiliary shaft or the clamping main shaft in a sliding manner, the spring block is abutted with a push-in spring which forces the protruding block to retract into the positioning hole, and the clamping main shaft or the clamping auxiliary shaft is positioned at the periphery of the positioning hole and is detachably connected with a mounting block for the push-in spring to be abutted.

Through adopting above-mentioned technical scheme, when centre gripping main shaft or centre gripping countershaft rotated, can make protruding piece part expose in the position measurement hole for the cutting fluid when polishing is difficult for getting into in the position measurement hole, so that position measurement hole inner wall keeps dry, in order to further promote the accuracy of range finding piece to the position measurement of position measurement hole.

Optionally, the lathe bed is equipped with the material loading transmission portion that will wait to polish the bent axle to the main shaft conveying of centre gripping, and material loading transmission portion transmission surface fixedly connected with several supplies the bent axle to place the positioning jig, and material loading transmission portion is equipped with the bent axle that will position in the jig and shifts to the main shaft department of centre gripping and carry out fixed material loading transfer mechanism.

Through adopting above-mentioned technical scheme for the bent axle can be transmitted with certain gesture on positioning jig, so that the quick and stable material loading of bent axle helps the promotion of bent axle efficiency of polishing.

Optionally, the material loading transfer mechanism is including locating the work or material rest of material loading transmission portion side, rotate the commentaries on classics piece of connecting in the work or material rest, locate the work or material rest and drive commentaries on classics piece pivoted revolving cylinder, locate the extension cylinder of commentaries on classics piece, locate the pneumatic finger that stretches out cylinder power pole and centre gripping to the bent axle.

By adopting the technical scheme, the crankshaft can be clamped and driven to the clamping main shaft for clamping and fixing.

Optionally, the lathe bed is equipped with the unloading transfer mechanism that is used for taking off the bent axle that the centre gripping countershaft centre gripping was got rid of, and the lathe bed is equipped with the inclined plane upper portion and accepts the unloading bevel portion of bent axle that unloading transfer mechanism took off, is equipped with the workbin of accepting the bent axle of polishing completion under the inclined plane minimum of unloading bevel portion department.

By adopting the technical scheme, the crankshafts with the polished ends can be taken down and fall into the feed box through the blanking inclined part, so that the crankshafts with the polished ends can be conveniently collected, and the crankshafts are not easy to be damaged due to larger impact.

Optionally, the equal fixedly connected with baffle in unloading bevel portion inclined plane both sides slope side department, baffle both ends all rotate and are connected with the band pulley, and the baffle is equipped with makes band pulley pivoted band pulley motor, and the transmission is connected with the hold-in range between two band pulleys, and hold-in range fixedly connected with can be close to the flitch that the unloading bevel portion inclined plane removed.

Through adopting above-mentioned technical scheme, when the bent axle stops moving on unloading sloping portion and can not fall down smoothly, the baffle can drive the bent axle down to make the bent axle be difficult for producing on the unloading sloping portion and push away the product.

Optionally, the synchronous belt is always driven along one direction, and the distance between the pushing plate and the blanking inclined part when the pushing plate moves from bottom to top along the oblique direction of the blanking inclined part is larger than the maximum distance between the pushing plate and the blanking inclined part when the crankshaft is positioned on the oblique surface of the blanking inclined part.

By adopting the technical scheme, when the pushing plate moves from the lower part of the blanking inclined part to the upper part, even if the crankshaft is arranged on the blanking inclined part, the pushing plate can not push the crankshaft to move upwards, and when the pushing plate moves to the inclined surface side of the synchronous belt, which is far away from the blanking inclined part, the pushing plate can stop moving until a certain amount of crankshaft stays on the blanking inclined part, and then the pushing plate moves.

Optionally, the lowest point of the inclined plane of the blanking inclined part is lower than the belt pulley with low height, so that the pushing plate can move close to the lower side edge of the inclined plane of the blanking inclined part.

By adopting the technical scheme, the pushing plate can push down the crankshaft which stays at the bottom of the inclined plane of the blanking inclined part smoothly.

In summary, the present application includes at least one of the following beneficial effects:

1. the polishing operation is completed on the two ends of the crankshaft relatively quickly, so that the overall polishing efficiency of the crankshaft is improved;

2. the bent axle can go up unloading by oneself, reduces the cost of labor, promotes whole efficiency of polishing.

Drawings

FIG. 1 is a schematic diagram of the main structure of the present application;

FIG. 2 is a schematic view of a partially cut-away structure of a clamping spindle at one end thereof where a positioning hole is formed;

FIG. 3 is an enlarged view at A in FIG. 2;

fig. 4 is a schematic view of the structure at the blanking slope.

Reference numerals illustrate: 1. a bed body; 2. clamping the main shaft; 3. polishing the main body; 31. a feed box; 32. a baffle; 33. a belt wheel; 34. a synchronous belt; 35. a pushing plate; 36. a belt wheel motor; 37. a side road; 4. clamping the auxiliary shaft; 41. positioning jig; 42. a feeding transfer mechanism; 43. a material rack; 44. a rotating block; 45. a rotary cylinder; 46. extending out of the cylinder; 47. pneumatic fingers; 48. a blanking transfer mechanism; 49. a blanking inclined part; 5. polishing the auxiliary body; 51. rotating the ring; 52. a positioning hole; 53. a detection frame; 54. a distance measuring member; 55. a protruding block; 56. a spring block; 57. pushing in a spring; 58. a mounting block; 59. and a feeding transmission part.

Detailed Description

The present application will be described in further detail with reference to the accompanying drawings.

The embodiment of the application discloses a high-precision crankshaft cylindrical grinding machine, which comprises a horizontal lathe bed 1 placed on the ground, wherein a clamping main shaft 2 and a clamping auxiliary shaft 4 are arranged right above the lathe bed 1, the clamping main shaft 2 and the clamping auxiliary shaft 4 are respectively provided with an eccentric clamp for clamping one end of a workpiece, the clamping main shaft 2 and the clamping auxiliary shaft 4 respectively move through a corresponding main shaft box, and the axial directions of the clamping main shaft 2 and the clamping auxiliary shaft 4 are the same and both move along the axial direction of the clamping main shaft 2 and the clamping auxiliary shaft 4. The lathe bed 1 is installed and can be along the horizontal radial main shaft 2 movable polishing main body 3 of centre gripping and polish vice body 5, polishes the main body 3 and carries out the excircle to the bent axle one end that centre gripping main shaft 2 centre gripping, then centre gripping countershaft 4 carries out the centre gripping to the bent axle one end that one end was accomplished and polishes for the vice body 5 polishes the remaining one end of the bent axle of centre gripping countershaft 4 centre gripping, in order to accomplish the both ends of bent axle and polish.

Referring to fig. 1, a feeding transmission part 59 is placed on the ground on one side of the machine body 1, the feeding transmission part 59 may be a belt conveyor, a plurality of positioning jigs 41 are uniformly and fixedly connected to a transmission surface of the feeding transmission part 59 along a transmission direction of the feeding transmission part, each positioning jig 41 is provided for a crankshaft to be placed in a predetermined posture, and one end of the crankshaft polished by the polishing body 3 is exposed to the positioning jigs 41, so that the crankshaft is convenient to be clamped. The feeding transmission part 59 is provided with a feeding transfer mechanism 42 for transferring a crankshaft in the positioning jig 41 to the clamping main shaft 2 for fixing, the feeding transfer mechanism 42 comprises a material frame 43 which is detachably connected to the feeding transmission part 59 and is close to one end frame of the clamping main shaft 2, the upper end of the material frame 43 is rotationally connected with a rotating block 44, the rotating axis direction of the rotating block 44 is consistent with the axis direction of the clamping main shaft 2, the material frame 43 is fixedly connected with a rotary cylinder 45 of which an output shaft is coaxially and fixedly connected with the rotating block 44, the rotating block 44 is detachably connected with an extension cylinder 46 which is a linear cylinder, and the end part of a power rod of the extension cylinder 46 is detachably connected with a pneumatic finger 47.

After the pneumatic finger 47 clamps one end of the crankshaft in the positioning jig 41, the extending cylinder 46 drives the pneumatic finger 47 to move upwards, then the rotating cylinder 45 drives the rotating block 44 to rotate 90 degrees, the extending cylinder 46 is changed from vertical to horizontal, then a power rod of the extending cylinder 46 extends, one end of the crankshaft clamped by the pneumatic finger 47 moves to a position coaxial with the axis of the clamping main shaft 2, and then the clamping main shaft 2 moves axially along the self so as to clamp and fix the crankshaft.

Referring to fig. 1, a vertical detecting frame 53 is detachably connected to a machine body 1, a distance measuring piece 54 is detachably connected to the detecting frame 53, the distance measuring piece 54 can be a laser distance measuring sensor for emitting laser beams to perform distance detection, a positioning hole 52 is formed in the end face of a clamping main shaft 2, which faces the distance measuring piece 54, a positioning hole 52 is far away from a position where an eccentric clamp is arranged on the clamping main shaft 2, when the distance measuring piece 54 faces the positioning hole 52, a distance value detected by the distance measuring piece 54 is increased, so that an external controller can know that the eccentric clamp for clamping a crankshaft of the clamping main shaft 2 is opposite to one end, clamped by a pneumatic finger 47, of the crankshaft, which is far away from the pneumatic finger 47, when the external controller receives a signal input by the distance measuring piece 54, the clamping main shaft 2 stops rotating and moves towards the crankshaft, and clamps the crankshaft smoothly.

Referring to fig. 1, the positioning holes 52 are also formed in the clamping auxiliary shaft 4 at positions away from the position where the eccentric jigs are provided, the detection frame 53 is provided with two distance measuring pieces 54, and the two distance measuring pieces 54 are in one-to-one correspondence to the positions of the positioning holes 52 of the clamping main shaft 2 and the clamping auxiliary shaft 4. The axis of the clamping auxiliary shaft 4 and the axis of the clamping main shaft 2 are positioned in the same vertical plane, the height of the axis of the clamping auxiliary shaft 4 is lower than that of the axis of the clamping main shaft 2, a circular track formed by rotating the clamping main shaft 2 around the axis of the clamping main shaft 2 at the position where the eccentric clamp is arranged is a rotating ring 51, and the axis of the clamping auxiliary shaft 4 passes through the lowest position of the rotating ring 51. After the polishing main body 3 finishes polishing one end of the crankshaft, the clamping auxiliary shaft 4 rotates until the positioning hole 52 of the clamping auxiliary shaft 4 is located at the lowest position and the eccentric clamp of the clamping auxiliary shaft 4 is located at the highest position, namely, the eccentric clamp of the clamping auxiliary shaft 4 is opposite to one end of the crankshaft, which finishes polishing, and then the clamping main shaft 2 and the clamping auxiliary shaft 4 are close to each other, so that one end of the crankshaft, which finishes polishing, is clamped by the clamping auxiliary shaft 4, and the subsequent polishing auxiliary body 5 polishes one end of the crankshaft, which is far away from the clamping auxiliary shaft 4. And, the crankshaft can smoothly pass through between the two distance measuring pieces 54.

Referring to fig. 2 and 3, the positioning holes 52 of the clamping main shaft 2 are described as an example since the positioning holes 52 of the clamping sub shaft 4 are provided in the same manner. The positioning hole 52 is inclined, one end of the positioning hole 52, which is close to the distance measuring piece 54, is far away from the axis of the clamping main shaft 2, the inner wall of the positioning hole 52 is slidably connected with a protruding block 55 along the axis direction of the positioning hole, one end of the protruding block 55, which is positioned in the positioning hole 52, is fixedly connected with a spring block 56, the end surface of the clamping main shaft 2, which is provided with the positioning hole 52, is provided with a side channel 37, which is communicated with the positioning hole 52, the length direction of the side channel 37 is consistent with the length direction of the positioning hole 52, the spring block 56 is slidably connected with the inner wall of the side channel 37 along the length direction of the side channel 37, the spring block 56 is abutted with a push spring 57, and the opening of the side channel 37 is detachably connected with a mounting block 58, which is abutted against one end, which is far away from the spring block 56, of the push spring 57.

Pushing in the spring 57 makes the spring block 56 move towards the inside of the clamping main shaft 2 so that the protruding block 55 tends to be located in the positioning hole 52, at this time, the protruding block 55 cannot influence the position of the distance measuring piece 54 for detecting the positioning hole 52, and when the clamping main shaft 2 rotates at a high speed to polish a crankshaft, the protruding block 55 is exposed to the positioning hole 52 under the action of centrifugal force, so that cutting fluid is not easy to enter into the positioning hole 52, and the influence of the distance measuring piece 54 on the alignment detection of the point of the inclined circumferential outer wall of the positioning hole 52, which is farthest from the distance measuring piece 54, is reduced.

Referring to fig. 1, when the grinding sub-body 5 finishes the grinding, the clamping sub-shaft 4 rotates again until the positioning hole 52 of itself is located at the lowest position and the eccentric jig of itself is located at the highest position. The lathe bed 1 is provided with a blanking transfer mechanism 48 with the structure consistent with that of the feeding transfer mechanism 42, the blanking transfer mechanism 48 is used for taking down a crankshaft clamped on the clamping auxiliary shaft 4, a blanking inclined part 49 is fixedly connected to the position of the lathe bed 1, which is opposite to the blanking transfer mechanism 48, and the bent shaft clamped by the blanking transfer mechanism 48 is placed at the upper end of the inclined surface of the blanking inclined part 49. Baffle 32 is fixedly connected to two inclined side edges of the inclined surface of the blanking inclined part 49, the length direction of the baffle 32 is consistent with the inclined direction of the inclined surface of the blanking inclined part 49, and a feed box 31 is arranged on the ground right below the lowest inclined surface of the blanking inclined part 49.

Referring to fig. 4, a belt pulley 33 is rotatably connected in both ends of a baffle 32, a synchronous belt 34 is connected between the two belt pulleys 33 in a transmission manner, the length direction of the synchronous belt 34 is consistent with the length direction of the baffle 32, an output shaft is fixedly connected to the bottom end of the baffle 32 and is coaxially and fixedly connected to a belt pulley motor 36 of the belt pulley 33, a pushing plate 35 is fixedly connected to one side of the synchronous belt 34, one end of the pushing plate 35 away from the synchronous belt 34 is close to the baffle 32 away from the synchronous belt 34, the bottom surface of the pushing plate 35 is close to the inclined surface of the blanking inclined part 49 when the pushing plate 35 is positioned on the side of the length with low height of the synchronous belt 34, and a crankshaft can smoothly pass through the bottom surface of the pushing plate 35 at the moment and the inclined surface of the blanking inclined part 49 when the pushing plate 35 is positioned on the side of the length with high height of the synchronous belt 34, so that the synchronous belt 34 can be driven in the same direction, and the falling of the crankshaft is not easy to influence. The low-height belt wheel 33 is lower than the lowest part of the inclined surface of the blanking inclined part 49, so that the pushing plate 35 can move past the lowest part of the inclined surface close to the blanking inclined part 49, and the crankshaft can be smoothly pushed into the feed box 31 by the pushing plate 35.

The implementation principle of the high-precision crankshaft cylindrical grinding machine provided by the embodiment of the application is as follows: the crankshaft is placed in the positioning jig 41 and is conveyed to the feeding transfer mechanism 42 by the feeding transfer mechanism 59, and is clamped and conveyed to the position opposite to the clamping main shaft 2 by the feeding transfer mechanism 42, then the clamping main shaft 2 rotates to the position where the eccentric clamp of the clamping main shaft 2 is aligned to the position where the crankshaft is not clamped, then the clamping main shaft 2 moves along the axial direction of the clamping main shaft 2, so that the clamping main shaft 2 can clamp a workpiece, then the polishing main body 3 polishes the outer circle of one end of the crankshaft, after polishing is completed, the clamping auxiliary shaft 4 rotates to the position where the eccentric clamp of the clamping auxiliary shaft 4 is aligned to the polished end of the crankshaft, then the clamping auxiliary shaft 4 is close to the clamping main shaft 2, so that the clamping auxiliary shaft 4 clamps the polished end of the crankshaft, and the polishing auxiliary body 5 can polish the rest end of the crankshaft at the moment, and meanwhile, the feeding transfer mechanism 42 can convey a new crankshaft to the position of the clamping main shaft 2 so as to synchronously polish two crankshafts.

After the polishing auxiliary body 5 finishes polishing, the clamping auxiliary shaft 4 rotates and adjusts to align the eccentric clamp of the clamping auxiliary shaft 4 to the axis of the clamping main shaft 2, and then the blanking transfer mechanism 48 takes down the clamped crankshaft of the clamping auxiliary shaft 4 and places the crankshaft at the upper end of the inclined plane of the blanking inclined part 49, so that the crankshafts with the polished two ends fall into the material box 31 along the inclined plane of the blanking inclined part 49.

The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.

Claims (10)

1. The utility model provides a high accuracy bent axle cylindrical grinder, includes lathe bed (1), locates lathe bed (1) and carries out centre gripping main shaft (2) of centre gripping to bent axle one end, locates lathe bed (1) and can carry out main part (3) of polishing to the bent axle one end excircle that is fixed by centre gripping main shaft (2), its characterized in that: the machine tool body (1) is provided with a clamping auxiliary shaft (4) for fixing one end of a polished crankshaft, the machine tool body (1) is provided with a polishing auxiliary body (5) for polishing the outer circle of the crankshaft fixed by the clamping auxiliary shaft (4), a circular rotating track formed by rotating one end of the crankshaft clamped by the clamping main shaft (2) around the rotating axis of the clamping main shaft (2) is a rotating ring (51), the axial directions of the clamping auxiliary shaft (4) and the clamping main shaft (2) are consistent, and a straight line where a rotating shaft of the clamping auxiliary shaft (4) is located passes through the rotating ring (51).

2. The high precision crankshaft cylindrical grinding machine according to claim 1, wherein: the clamping auxiliary shaft (4) and the clamping main shaft (2) are respectively provided with a positioning hole (52) at positions far away from the crankshaft for clamping, the lathe bed (1) is provided with a detection frame (53), and the detection frame (53) is provided with two distance measuring pieces (54) which can emit light beams and are in one-to-one correspondence with the positions of the positioning holes (52) of the clamping auxiliary shaft (4) and the clamping main shaft (2).

3. The high precision crankshaft cylindrical grinding machine according to claim 2, wherein: the positioning holes (52) are inclined, and openings of the positioning holes (52) at the end faces of the clamping main shaft (2) or the clamping auxiliary shaft (4) are far away from the axes of the corresponding clamping main shaft (2) or the clamping auxiliary shaft (4).

4. A high precision crankshaft cylindrical grinding machine according to claim 3, wherein: the positioning hole (52) is internally provided with a protruding block (55) which can be partially exposed out of the positioning hole (52) in a sliding manner along the axial direction of the positioning hole, the protruding block (55) is fixedly connected with a spring block (56) which is slidably connected into the clamping auxiliary shaft (4) or the clamping main shaft (2), the spring block (56) is abutted with a push-in spring (57) which forces the protruding block (55) to retract into the positioning hole (52), and the clamping main shaft (2) or the clamping auxiliary shaft (4) is positioned at the periphery of the positioning hole (52) and can be detachably connected with a mounting block (58) for the push-in spring (57) to be abutted.

5. The high precision crankshaft cylindrical grinding machine according to claim 1, wherein: the lathe bed (1) is provided with a feeding transmission part (59) for transmitting crankshafts to be polished to the clamping main shaft (2), a plurality of positioning jigs (41) for placing the crankshafts are fixedly connected to the transmission surface of the feeding transmission part (59), and the feeding transmission part (59) is provided with a feeding transfer mechanism (42) for transferring the crankshafts in the positioning jigs (41) to the clamping main shaft (2) for fixing.

6. The high precision crankshaft cylindrical grinding machine according to claim 5, wherein: the feeding transfer mechanism (42) comprises a material rack (43) arranged on the side edge of the feeding transmission part (59), a rotating block (44) rotatably connected to the material rack (43), a rotating cylinder (45) arranged on the material rack (43) and driving the rotating block (44) to rotate, an extending cylinder (46) arranged on the rotating block (44), and a pneumatic finger (47) arranged on a power rod of the extending cylinder (46) and clamping a crankshaft.

7. The high precision crankshaft cylindrical grinding machine according to claim 5, wherein: the lathe bed (1) is provided with a blanking transfer mechanism (48) for taking down a crankshaft clamped by the clamping auxiliary shaft (4), the lathe bed (1) is provided with a blanking inclined part (49) of which the upper part of the inclined plane is used for receiving the crankshaft taken down by the blanking transfer mechanism (48), and a feed box (31) for receiving the polished crankshaft is arranged right below the lowest point of the inclined plane of the blanking inclined part (49).

8. The high precision crankshaft cylindrical grinding machine according to claim 7, wherein: the blanking oblique part (49) inclined plane both sides side department all fixedly connected with baffle (32), baffle (32) both ends all rotate and are connected with band pulley (33), baffle (32) are equipped with and make band pulley (33) pivoted band pulley motor (36), and the transmission is connected with hold-in range (34) between two band pulleys (33), and hold-in range (34) fixedly connected with can be close to blanking oblique part (49) inclined plane removal push away flitch (35).

9. The high precision crankshaft cylindrical grinding machine according to claim 8, wherein: the synchronous belt (34) is always driven along one direction, and the distance between the pushing plate (35) and the blanking inclined part (49) when the pushing plate moves from bottom to top along the oblique direction of the blanking inclined part (49) is larger than the maximum distance between the crankshaft and the blanking inclined part (49) when the crankshaft is positioned on the oblique surface of the blanking inclined part (49).

10. The high precision crankshaft cylindrical grinding machine according to claim 8, wherein: the lowest point of the inclined surface of the blanking inclined part (49) is lower than the belt wheel (33) with low height, so that the pushing plate (35) can move close to the lower side edge of the inclined surface of the blanking inclined part (49).