CN220463063U - Auxiliary device for machine tool machining - Google Patents

Abstract

The utility model discloses an auxiliary device for machine tool machining, and mainly relates to the technical field of machine tool machining. Including rotating the auxiliary fixtures who is connected and use with the annular piece cooperation with the lathe, the symmetry is equipped with the benchmark hole on the annular piece, and the auxiliary fixtures includes the base of rotating with the lathe to be connected, is equipped with the spout on the base, and symmetrical sliding connection has the slider in the spout, and one side of slider contacts with the annular piece, is equipped with the screw rod on the slider, is equipped with the fixed block on the screw rod, and after the screw rod passed the benchmark hole with fixed block threaded connection, one side of fixed block contacts with the annular piece, rotates on the fixed block to be connected with a plurality of pinch bar, and the tip rotation of pinch bar is connected with the locating piece that contacts with the benchmark hole. The utility model has the beneficial effects that: the problem of the annular piece machining precision of taking the symmetry centre bore as the benchmark is lower is solved, the precision and the efficiency of annular piece processing are improved.

Description

Auxiliary device for machine tool machining

Technical Field

The utility model relates to the technical field of machine tool machining, in particular to an auxiliary device for machine tool machining.

Background

Machine tools refer to machines for producing machines, also known as machine tools or machine tools, which are conventionally referred to as machine tools. Generally, metal cutting machine tools, forging machine tools, woodworking machine tools, etc. are classified. There are many ways to process machine parts in modern machine manufacturing: in addition to cutting, there are casting, forging, welding, stamping, extrusion, etc., and for parts with high precision and fine surface roughness, it is generally necessary to perform final machining by cutting on a machine tool.

Along with the development of the mechanical manufacturing industry, the degree of automation is higher and higher, the processing of parts of a plurality of products is completed by a numerical control machine tool, and in the processing process of workpieces, the workpieces need to be clamped by a tool in an auxiliary manner, so that the movement of the workpieces in the processing process is avoided, and the processing precision of the machine tool is prevented from being influenced.

At present, the outer side of the annular piece is generally grabbed through a three-jaw chuck, one side or one side of the annular piece is machined by a cutter on a tool rest plate of a machine tool, after one side or one side of a workpiece is machined, the workpiece is required to be overturned or turned around, the other side or the other side of the workpiece is machined, the positioning reference is easily generated due to the secondary positioning of the annular piece, and the machining precision of the annular workpiece is reduced to a certain extent. In addition, for the annular piece taking the symmetrical center hole as a reference, if the auxiliary tool still clamps the side surface of the annular piece, the machining precision of the annular piece is further affected due to the fact that the machining reference is inconsistent with the design reference.

Disclosure of Invention

The utility model aims to provide an auxiliary device for machine tool machining, which solves the problem of lower machining precision of an annular part by taking a central hole as a design reference and improves the precision and efficiency of machining the annular part.

The utility model aims to achieve the aim, and the utility model is realized by the following technical scheme:

the utility model provides an auxiliary device is used in lathe processing, includes the auxiliary fixtures that rotates with the lathe to be connected and use with the annular, the symmetry is equipped with the benchmark hole on the annular, the auxiliary fixtures includes the base of rotating with the lathe to be connected, be equipped with the spout on the base, symmetrical sliding connection has the slider in the spout, one side and the annular of slider contact, be equipped with the screw rod on the slider, be equipped with the fixed block on the screw rod, the screw rod passes behind the benchmark hole with fixed block threaded connection, one side and the annular of fixed block contact, rotate on the fixed block and be connected with a plurality of pinch bar, the tip rotation of pinch bar is connected with the locating piece that contacts with the benchmark hole.

Further, sliding connection has first wedge and second wedge on the fixed block, the tip rotation of crow bar is connected with the gyro wheel, one side of first wedge and second wedge is equipped with first inclined plane and the second inclined plane that contacts with the gyro wheel respectively, be equipped with the gliding driving piece of drive first wedge on the fixed block, be equipped with first spring between second wedge and the fixed block.

Further, one side of the driving blocks is simultaneously contacted with the annular piece, a third inclined plane contacted with the first wedge-shaped block is arranged on the other side of the driving block, and a second spring is arranged between the driving block and the fixed block.

Further, the end part of the positioning block is provided with an arc surface which is in contact with the reference hole, and the outer diameter of the arc surface is smaller than the inner diameter of the reference hole.

Further, the pushing block is rotationally connected to the machine tool, a connecting block is arranged between the pushing block and the two sliding blocks respectively, and an air cylinder for driving the pushing block to slide is arranged on the machine tool.

Further, the end of the pushing block is provided with a T-shaped groove, the movable end of the air cylinder is provided with a T-shaped block rotationally connected with the T-shaped groove, and two sides of the T-shaped block are respectively contacted with two sides of the T-shaped groove.

Further, the base is provided with a limiting groove communicated with the sliding groove, limiting blocks which are in sliding connection with the limiting groove are respectively arranged on two sides of the sliding block, and pulleys which are in sliding contact with the limiting groove are rotationally connected to the limiting blocks.

Compared with the prior art, the utility model has the beneficial effects that:

1. placing the annular piece on a machine tool, enabling two screws to respectively penetrate through the reference hole of the annular piece until the annular piece is contacted with one side of the sliding block, and then rotating the fixed block on the screws, wherein the screws are in threaded connection with the fixed block, so that the fixed block slides on the screws until the fixed block is contacted with the other side of the annular piece; the fixing block and the sliding block are respectively contacted with two sides of the annular piece, so that the annular piece is limited to axially slide, the annular piece is axially positioned, the annular piece is prevented from axially moving in the processing process, and the processing precision of the annular piece is further improved;

2. the positioning blocks arranged at the end parts of the pry bars are driven to contact with the reference holes by rotating the pry bars on the fixed blocks, so that the radial movement of the annular part is limited, the radial positioning of the annular part is realized, the radial movement of the annular part in the machining process is avoided, and the machining precision of the annular part is improved;

3. the annular piece is clamped by using the auxiliary tool through the steps, the outer side of the annular piece is not required to be clamped, meanwhile, the two ends of the annular piece can be directly machined, and turning is not required; in addition, the positioning reference of the auxiliary tool is kept consistent with the drawing design reference, so that the precision and the efficiency of machining the annular piece are improved;

4. by sliding the sliding block, annular pieces with different reference hole pitches can be fixed, and an auxiliary tool is not required to be designed independently to adapt to different annular pieces, so that the cost for manufacturing the auxiliary tool and the time for replacing the auxiliary tool are reduced;

5. the reference holes of the annular piece are fixed through the positioning blocks, the positioning blocks are uniformly distributed around the screw rod, the central shaft of the screw rod is consistent with the central shaft of the reference holes, and the sliding blocks are symmetrically and slidably connected on the base, so that the center distance between the two reference holes of the annular piece is consistent with the center distance of the screw rod, and the processing requirements of different reference holes are met.

Drawings

Fig. 1 is a schematic diagram of the structure of the present utility model.

Fig. 2 is an enlarged view of a portion of the utility model at a of fig. 1.

Fig. 3 is a schematic structural view of the fixing block of the present utility model.

Fig. 4 is an enlarged view of a portion of the utility model at B in fig. 1.

Fig. 5 is a schematic view of the structure of the slider of the present utility model.

The reference numbers shown in the drawings:

1. a machine tool; 2. a ring member; 3. an auxiliary tool; 4. a reference hole; 5. a base; 6. a chute; 7. a slide block; 8. a screw; 9. a fixed block; 10. a pry bar; 11. a positioning block; 12. a first wedge block; 13. a second wedge block; 14. a roller; 15. a first inclined surface; 16. a second inclined surface; 17. a driving block; 18. a first spring; 19. a third inclined surface; 20. a second spring; 21. a cambered surface; 22. a pushing block; 23. a connecting block; 24. a cylinder; 25. a T-shaped groove; 26. a T-shaped block; 27. a limit groove; 28. a limiting block; 29. a pulley; 30. a driven gear; 31. a driving motor; 32. a drive gear; 33. and (3) a bearing.

Detailed Description

The utility model will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present utility model and are not intended to limit the scope of the present utility model. Further, it will be understood that various changes or modifications may be made by those skilled in the art after reading the teachings of the utility model, and such equivalents are intended to fall within the scope of the utility model as defined herein.

The utility model provides an auxiliary device for machine tool machining, as shown in figures 1, 2 and 3, which comprises an auxiliary tool 3 which is rotationally connected with a machine tool 1 and is matched with an annular piece 2 for use, wherein a reference hole 4 of the annular piece 2 is clamped by the auxiliary tool 3, so that the annular piece 2 is positioned, the subsequent machining of the annular piece 2 is facilitated, and meanwhile, the positioning reference of the auxiliary tool 3 is kept consistent with a drawing design reference, and the machining precision and efficiency of the annular piece 2 are improved; the annular piece 2 is symmetrically provided with a reference hole 4, the auxiliary tool 3 comprises a base 5 which is rotationally connected with the machine tool 1, specifically, a driven gear 30 is arranged on the outer side of the base 5, a driving motor 31 is arranged on the machine tool 1, and a driving gear 32 meshed with the driven gear 30 is arranged at the movable end of the driving motor 31, so that the driving gear 32 is driven to rotate through the driving motor 31, and the side face of the annular piece 2 is machined by matching with a cutter on the machine tool 1; in addition, a bearing 33 matched with the base 5 is sleeved on the outer side of the machine tool 1, so that friction between the base 5 and the machine tool 1 is reduced, and the base 5 can rotate on the machine tool 1 conveniently; the base 5 is provided with the sliding groove 6, the sliding blocks 7 are symmetrically and slidingly connected in the sliding groove 6, and the sliding blocks 7 are slid in the sliding groove 6 to drive the screw rods 8 to move on the base 5, so that the distances between the two screw rods 8 and the two reference holes 4 are equal, annular pieces 2 with different distances between the reference holes 4 are fixed, an auxiliary tool 3 is not required to be independently designed to adapt to different annular pieces 2, and the cost and the time for replacing the auxiliary tool 3 are reduced; one side of the sliding block 7 is contacted with the annular piece 2, a screw rod 8 is arranged on the sliding block 7, a fixed block 9 is arranged on the screw rod 8, the screw rod 8 passes through the reference hole 4 and is in threaded connection with the fixed block 9, one side of the fixed block 9 is contacted with the annular piece 2, and the fixed block 9 and the sliding block 7 are respectively contacted with two sides of the annular piece 2, so that the annular piece 2 is limited to axially slide, the annular piece 2 is axially positioned, the annular piece 2 is prevented from axially moving in the processing process, and the processing precision of the annular piece 2 is further improved; the fixed block 9 is rotationally connected with a plurality of pry bars 10, the end parts of the pry bars 10 are rotationally connected with positioning blocks 11 which are contacted with the reference holes 4, and the positioning blocks 11 arranged at the end parts of the pry bars 10 are driven to be contacted with the reference holes 4 by rotating the pry bars 10 on the fixed block 9, so that the radial movement of the annular part 2 is limited, the radial positioning of the annular part 2 is realized, the radial movement of the annular part 2 in the processing process is avoided, and the processing precision of the annular part 2 is further improved; in addition, the reference holes 4 of the annular piece 2 are positioned through the positioning blocks 11, the centers of the two reference holes 4 of the annular piece 2 are consistent with the center of the screw rod 8, and the sliding connection of the sliding blocks 7 is symmetrical on the base 5, so that the central shaft of the annular piece 2 is consistent with the central shaft of the auxiliary tool 3, the processing requirement with the reference holes 4 as the center is met, the two ends of the annular piece 2 can be directly processed, turning is not needed, and the processing precision and efficiency of the annular piece 2 are improved.

Preferably, as shown in fig. 2 and fig. 3, the fixed block 9 is slidably connected with a first wedge block 12 and a second wedge block 13, the end portion of the pry bar 10 is rotatably connected with a roller 14, one side of the first wedge block 12 and one side of the second wedge block 13 are respectively provided with a first inclined surface 15 and a second inclined surface 16 which are contacted with the roller 14, the first wedge block 12 and the second wedge block 13 slide on the fixed block 9, the first inclined surface 15 and the second inclined surface 16 are respectively contacted with the roller 14, and the generated component force drives the pry bar 10 to rotate on the fixed block 9 until a positioning block 11 arranged at the end portion of the pry bar 10 is contacted with or reset with a reference hole 4, so that the operation step of driving the positioning block 11 to move is simplified, and the efficiency of fixing the annular piece 2 is improved; the fixed block 9 is provided with a driving block 17 for driving the first wedge block 12 to slide, a first spring 18 is arranged between the second wedge block 13 and the fixed block 9 and used for resetting the second wedge block 13, and the second wedge block 13 is contacted with the roller 14 to drive the pry bar 10 to reset, so that the fixing of the positioning block 11 to the annular piece 2 is relieved.

Preferably, as shown in fig. 2 and 3, one side of a plurality of driving blocks 17 contacts with the annular piece 2 at the same time, the other side of the driving blocks 17 is provided with a third inclined surface 19 contacting with the first wedge-shaped block 12, the fixing blocks 9 slide on the screw 8 until one side of a plurality of driving blocks 17 contacts with the annular piece 2 at the same time by rotating the fixing blocks 9 on the screw 8, thereby driving the driving blocks 17 to slide on the fixing blocks 9, and the first wedge-shaped blocks 12 are driven to slide on the fixing blocks 9 by contacting with the first inclined surface 19 arranged on the other side of the driving blocks 17, so that a plurality of positioning blocks 11 simultaneously contact with the reference holes 4, thereby limiting the annular piece 2 to move along the axial direction, and simultaneously, no additional driving device is required to drive the positioning blocks 11 to move, thereby reducing the cost required by manufacturing and the space required by installing the driving device of the auxiliary tool 3; a second spring 20 is arranged between the driving block 17 and the fixed block 9 and is used for resetting the driving block 17.

Preferably, as shown in fig. 4, the end of the positioning block 11 is provided with an arc surface 21 contacting with the reference hole 4, and the outer diameter of the arc surface 21 is smaller than the inner diameter of the reference hole 4, so that the positioning block 11 can fix the annular parts 2 with different inner diameters of the reference hole 4, and the auxiliary tool 3 does not need to be designed separately to adapt to different annular parts 2, thereby reducing the cost required by manufacturing the auxiliary tool 3 and the time required by replacement.

Preferably, as shown in fig. 1 and fig. 4, the machine tool 1 is rotatably connected with a push block 22, a connecting block 23 is respectively arranged between the push block 22 and two sliding blocks 7, a cylinder 24 for driving the push block 22 to slide is arranged on the machine tool 1, the cylinder 24 drives the push block 22 to slide on the machine tool 1, one end of the connecting block 23 is driven to move, and as two ends of the connecting block 23 are respectively rotatably connected with the push block 22 and the sliding blocks 7, the sliding blocks 7 are driven to slide in the sliding grooves 6 at the same time, the distances between the two screw rods 8 and the two reference holes 4 are equal, the annular pieces 2 with different distances between the reference holes 4 are processed, the auxiliary tool 3 is not required to be designed independently to adapt to different annular pieces 2, and the cost and the time required for replacing the auxiliary tool 3 are reduced.

Preferably, as shown in fig. 1 and fig. 4, the end of the push block 22 is provided with a T-shaped slot 25, and the movable end of the cylinder 24 is provided with a T-shaped block 26 rotationally connected with the T-shaped slot 25, so that when the machine tool 1 drives the base 5 to rotate, the push block 22 can rotate relative to the cylinder 24, and the push block 22 and the machine tool 1 are prevented from being blocked and prevented from being sprung, and two sides of the T-shaped block 26 are respectively contacted with two sides of the T-shaped slot 25, so that the cylinder 24 can drive the push block 22 to slide on the machine tool 1.

Preferably, as shown in fig. 5, the base 5 is provided with a limiting groove 27 communicated with the chute 6, and two sides of the sliding block 7 are respectively provided with a limiting block 28 in sliding connection with the limiting groove 27, so as to limit the sliding track of the sliding block 7 and prevent the sliding block 7 from sliding out of the fixed block 9; the limiting block 28 is rotatably connected with a pulley 29 in sliding contact with the limiting groove 27, so that friction force between the sliding block 7 and the fixed block 9 is reduced, and the sliding block 7 slides on the fixed block 9 better.

Example 1

The utility model provides an auxiliary device for machine tool machining, as shown in figures 1, 2 and 3, comprising a machine tool 1 and an auxiliary tool 3, wherein the center distance of two reference holes 4 or a reference drawing numerical value is measured, two sliding blocks 7 are pushed to slide in a sliding groove 6 at the same time, so that the center distance of the two sliding blocks 7 is equal to the center distance of the two reference holes 4, an annular piece 2 is placed on the machine tool 1, two screw rods 8 respectively penetrate through the reference holes 4 of the annular piece 2 until one side of the annular piece 2 is contacted with one side of the sliding blocks 7, then a fixed block 9 is rotated on the screw rods 8, and the fixed block 9 slides on the screw rods 8 until the fixed block 9 is contacted with the other side of the annular piece 2 due to the threaded connection of the screw rods 8 and the fixed block 9; the fixed blocks 9 and the sliding blocks 7 are respectively contacted with two sides of the annular piece 2, so that the annular piece 2 is limited to axially slide, the annular piece 2 is axially positioned, the annular piece 2 is prevented from axially moving in the processing process, and the processing precision of the annular piece 2 is further improved; in addition, the annular pieces 2 with different intervals of the reference holes 4 can be fixed, the auxiliary tool 3 does not need to be designed separately to adapt to different annular pieces 2, and the cost required by manufacturing the auxiliary tool 3 and the time required by replacement are reduced;

finally, a plurality of pry bars 10 are rotated on the fixed block 9, and a positioning block 11 arranged at the end part of each pry bar 10 is driven to be in contact with the reference hole 4, so that radial movement of the annular piece 2 is limited, radial positioning of the annular piece 2 is realized, radial movement of the annular piece 2 in the machining process is avoided, meanwhile, the positioning reference of the auxiliary tool 3 is kept consistent with the design reference of a drawing, and further the machining precision of the annular piece 2 is improved; in addition, the reference holes 4 of the annular piece 2 are fixed through a plurality of positioning blocks 11, the positioning blocks 11 are uniformly distributed on the periphery of the screw rod 8, so that the central axis of the screw rod 8 is consistent with the central axis of the reference holes 4, and the sliding blocks 7 are symmetrically and slidingly connected on the base 5, so that the center distance between the two reference holes 4 of the annular piece 2 is consistent with the center distance of the screw rod 8, and the processing requirements of different reference holes 4 are met; at the moment, the two ends of the annular piece 2 can be directly processed without clamping the outer side of the annular piece 2, and turning is not required, so that the processing precision and efficiency of the annular piece 2 are improved; through the steps, the auxiliary tool 3 clamps the annular piece 2, and positions the annular piece 2, so that the annular piece 2 can be conveniently machined later;

finally, the driving gear 32 is driven to rotate by the driving motor 31 to drive the driven gear 30 arranged on the base 5 to rotate, so that the auxiliary tool 3 is driven to rotate on the machine tool 1 and is matched with a tool on the machine tool 1 to process the side face of the ring-shaped piece 2, in addition, a bearing 33 matched with the base 5 is sleeved on the outer side of the machine tool 1, friction between the base 5 and the machine tool 1 is reduced, and the base 5 can rotate on the machine tool 1 conveniently.

Example 2

On the basis of embodiment 1, as shown in fig. 1, 2 and 3, when one side of the annular piece 2 is required to be fixed by the fixed block 9, the fixed block 9 slides on the screw 8 by rotating the fixed block 9 on the screw 8 until one side of the plurality of driving blocks 17 is simultaneously contacted with the annular piece 2, thereby driving the driving blocks 17 to slide on the fixed block 9, and driving the first wedge block 12 to slide on the fixed block 9 by contacting a third inclined surface 19 arranged on the other side of the driving blocks 17 with the first wedge block 12, so that a first inclined surface 15 arranged on the first wedge block 12 is contacted with the roller 14, and the generated component force drives the pry bar 10 to rotate on the fixed block 9 until an arc surface 21 arranged at the end part of the positioning block 11 is contacted with the reference hole 4, so that the positioning block 11 can fix the annular piece 2 with different inner diameters of the reference hole 4, and the auxiliary tool 3 is not required to be designed independently to be adapted to different annular pieces 2, so that the cost and the time required for manufacturing and replacement of the auxiliary tool 3 are reduced; in addition, the operation steps of driving the positioning blocks 11 to move are simplified, and the efficiency of fixing the annular piece 2 is improved;

after the annular piece 2 is machined, the fixed block 9 is reversely rotated to reversely move on the screw rod 8, meanwhile, the driving block 17 is driven to reset by the resilience force generated after the second spring 20 is compressed, the second wedge-shaped block 13 is driven to slide on the fixed block 9 by the resilience force generated after the first spring 18 is compressed, the second inclined surface 16 arranged on the second wedge-shaped block 13 is contacted with the roller 14, and the generated component force drives the pry bar 10 to reversely rotate on the fixed block 9, so that the fixing of the annular piece 2 by the positioning block 11 is released, and the annular piece 2 is taken down from the auxiliary tool 3.

Example 3

On the basis of embodiment 1, as shown in fig. 1, 4 and 5, a T-shaped block 26 is driven to slide on a machine tool 1 through an air cylinder 24, and as two sides of the T-shaped block 26 are respectively contacted with two sides of a T-shaped groove 25, the T-shaped block 26 drives a push block 22 to slide on the machine tool 1, so that one end of a connecting block 23 is driven to move, and as two ends of the connecting block 23 are respectively rotationally connected with the push block 22 and a sliding block 7, the sliding block 7 is driven to slide in a sliding groove 6 at the same time, the central shaft of an annular piece 2 is kept consistent with the central shaft of an auxiliary tool 3, so that the processing requirement with a reference hole 4 as the center is met, two ends of the annular piece 2 can be directly processed without turning around, and the processing precision and efficiency of the annular piece 2 are further improved; in addition, the limiting blocks 28 arranged on the two sides of the sliding block 7 are in sliding connection with the limiting grooves 27 to limit the sliding track of the sliding block 7, so that the sliding block 7 is prevented from sliding out of the fixed block 9; simultaneously, through the sliding contact between the pulley 29 arranged on the limiting block 28 and the limiting groove 27, the friction force between the sliding block 7 and the fixed block 9 is reduced, so that the sliding block 7 slides on the fixed block 9 better; the distance between the two screws 8 and the two reference holes 4 is equal, the annular parts 2 with different distances between the reference holes 4 are machined, the auxiliary tool 3 is not required to be designed independently to adapt to different annular parts 2, and the cost for manufacturing the auxiliary tool 3 and the time for replacing the auxiliary tool 3 are reduced;

when the auxiliary tool 3 is driven by the machine tool 1 to drive the annular piece 2 to rotate, the T-shaped block 26 is rotationally connected with the T-shaped groove 25, so that the push block 22 can rotate relative to the air cylinder 24, and the situation that the push block 22 and the machine tool 1 are blocked and cannot be sprung is avoided.

Claims (7)

1. Auxiliary device for lathe processing, include with lathe (1) rotate be connected and with auxiliary fixtures (3) that annular piece (2) cooperation used, the symmetry is equipped with benchmark hole (4), its characterized in that on annular piece (2): the auxiliary fixture (3) comprises a base (5) rotationally connected with a machine tool (1), a sliding groove (6) is formed in the base (5), a sliding block (7) is symmetrically connected with the sliding groove (6) in a sliding mode, one side of the sliding block (7) is contacted with an annular piece (2), a screw rod (8) is arranged on the sliding block (7), a fixing block (9) is arranged on the screw rod (8), the screw rod (8) penetrates through a reference hole (4) and then is in threaded connection with the fixing block (9), one side of the fixing block (9) is contacted with the annular piece (2), a plurality of prying bars (10) are rotationally connected to the fixing block (9), and a positioning block (11) contacted with the reference hole (4) is rotationally connected to the end portion of the prying bars (10).

2. An auxiliary device for machine tool machining according to claim 1, wherein: the utility model discloses a pinch roller for a bicycle, including fixed block (9), pinch roller (10), fixed block (9) are last sliding connection has first wedge (12) and second wedge (13), the tip rotation of pinch roller (10) is connected with gyro wheel (14), one side of first wedge (12) and second wedge (13) is equipped with first inclined plane (15) and second inclined plane (16) that contact with gyro wheel (14) respectively, be equipped with on fixed block (9) drive first wedge (12) gliding driving piece (17), be equipped with first spring (18) between second wedge (13) and fixed block (9).

3. An auxiliary device for machine tool machining according to claim 2, wherein: one side of each of the driving blocks (17) is simultaneously in contact with the annular piece (2), a third inclined surface (19) in contact with the first wedge-shaped block (12) is arranged on the other side of each of the driving blocks (17), and a second spring (20) is arranged between each of the driving blocks (17) and the fixing block (9).

4. A machine tool machining assist device according to claim 3, wherein: an arc surface (21) which is in contact with the reference hole (4) is arranged at the end part of the positioning block (11), and the outer diameter of the arc surface (21) is smaller than the inner diameter of the reference hole (4).

5. An auxiliary device for machine tool machining according to claim 1, wherein: the machine tool (1) is rotationally connected with a push block (22), connecting blocks (23) are respectively arranged between the push block (22) and the two sliding blocks (7), and an air cylinder (24) for driving the push block (22) to slide is arranged on the machine tool (1).

6. An auxiliary device for machine tool machining according to claim 5, wherein: the end of the pushing block (22) is provided with a T-shaped groove (25), the movable end of the air cylinder (24) is provided with a T-shaped block (26) rotationally connected with the T-shaped groove (25), and two sides of the T-shaped block (26) are respectively contacted with two sides of the T-shaped groove (25).

7. An auxiliary device for machine tool machining according to claim 1, wherein: the base (5) is provided with a limiting groove (27) communicated with the sliding groove (6), two sides of the sliding block (7) are respectively provided with limiting blocks (28) which are in sliding connection with the limiting groove (27), and the limiting blocks (28) are rotationally connected with pulleys (29) which are in sliding contact with the limiting groove (27).