CN217832981U - Fixed tool and car mill - Google Patents

Abstract

The application provides a fixed tool for fixed product, product include the diapire and encircle the lateral wall that the diapire set up all around, are provided with the opening on the diapire, and the tip that the lateral wall is not connected to the diapire is provided with the recess, and fixed tool includes: the peripheral wall of the supporting block is used for abutting against the side wall when a product is sleeved on the supporting block, and a first through hole is formed in the top end of the supporting block corresponding to the opening; the fixing seat is used for bearing the supporting block, and is also provided with a bulge which is arranged corresponding to the groove; the air cylinder is arranged on the fixed seat and is accommodated in the supporting block, the output end of the air cylinder is provided with a blind rivet, and the blind rivet is arranged corresponding to the opening and can extend out of the first through hole and the opening; and the cover plate is used for being connected with the blind rivet when the product is sleeved on the supporting block and is matched with the supporting block to clamp the product. The present application additionally provides a turning and grinding machine.

Description

Fixed tool and car mill

Technical Field

The application relates to a car grinds the processing field, especially relates to a fixed tool and car mill.

Background

A product to be processed, such as a housing of a mini-computer, includes a bottom wall and a sidewall surrounding the bottom wall. In a conventional processing scheme, a numerical control machine is usually adopted and a milling cutter with a large-diameter end is provided to vertically process the side wall of a product. However, the ports of the side walls can vibrate due to forces during product rotation and are unsupported when vibrating outwardly. This results in unstable quality of the machining at the end opening of the side wall and is liable to generate vertical cutting lines.

SUMMERY OF THE UTILITY MODEL

Accordingly, there is a need for a fixing jig and a grinding machine for fixing and processing a product and providing a support for the product to reduce the generation of knife lines.

The first aspect of this application provides a fixed tool for fixed product, the product includes the diapire and encircles the lateral wall that the diapire set up all around, be provided with the opening on the diapire, the lateral wall is not connected to the tip of diapire is provided with the recess, fixed tool includes:

the peripheral wall of the supporting block is used for abutting against the side wall when the product is sleeved on the supporting block, and the top end of the supporting block is provided with a first through hole corresponding to the opening;

the fixing seat is used for bearing the supporting block, and is also provided with a bulge which is arranged corresponding to the groove;

the air cylinder is arranged on the fixed seat and is accommodated in the supporting block, a blind rivet is arranged at the output end of the air cylinder, the blind rivet corresponds to the opening, and the blind rivet can extend out of the first through hole and the opening; and

the cover plate is used for being connected with the blind rivet when the product is sleeved on the supporting block and matched with the supporting block to clamp the product.

Optionally, the fixed tool still includes the guide block, the guide block accept in the bracing piece, and be located the cylinder is kept away from one side of fixing base, the guide block includes: the main body part is arranged on the fixed seat; the extension part is located on one side, far away from the fixing seat, of the main body part, the extension part corresponds to the first through hole, a first sunken part is formed in the surface, far away from the main body part, of the extension part and sunken towards the direction of the main body part, a second through hole is formed in the first sunken part, and the second through hole is used for the blind rivet to penetrate through.

Optionally, the cover plate comprises: the cover body is provided with a third through hole; the connecting block is arranged on the cover body and corresponds to the third through hole, the connecting block comprises a first surface and a second surface, the first surface is the surface of the connecting block, which is far away from the cover body, the first surface is sunken towards the direction of the cover body to form a second sunken part, a sliding hole is formed in the second sunken part, the sliding hole penetrates through the first surface and the second surface and is used for the blind rivet to pass through, the sliding hole comprises a first end and a second end which are connected, the diameter of the first end is larger than the diameter of the blind rivet, which is far away from the cylinder, and the diameter of the second end is smaller than the diameter of the blind rivet, which is far away from the cylinder; and the end cap is arranged on one side, far away from the cover body, of the connecting block.

Optionally, the fixing jig further comprises a connecting shaft, one end of the connecting shaft is connected with the fixing seat, and the other end of the connecting shaft is connected with a main shaft for providing rotary power for the fixing jig.

Optionally, the fixing base includes: the first step part is arranged on the base and comprises a first plane and a first side surface, one end of the first side surface is connected with the first plane, the other end of the first side surface is connected with the base, the bulge is arranged on the first plane, and the outline of the first side surface is consistent with the outline of the outer side of the side wall of the product; and the second step part is arranged on one side, far away from the base, of the first step part and comprises a second plane and a second side surface, one end of the second side surface is connected with the second plane, the other end of the second side surface is connected with the first step part, and the outline of the second side surface is consistent with the outline of the inner side of the side wall of the product.

A second aspect of the present application provides a vehicle grinding machine comprising:

a frame;

the first feeding mechanism is arranged on the rack;

the second feeding mechanism is arranged on the rack;

the main shaft is arranged on the first feeding mechanism and can move along a first direction under the driving of the first feeding mechanism, and the main shaft is used for driving the product to rotate;

the fixing jig is arranged on the main shaft;

the motor is arranged on the second feeding mechanism and can move along a second direction under the driving of the second feeding mechanism, and the second direction is perpendicular to the first direction; and

the grinding wheel is connected with the motor and can rotate under the driving of the motor, and the grinding wheel is arranged corresponding to the fixed jig;

wherein, fixed tool includes: the peripheral wall of the supporting block is used for abutting against the side wall when the product is sleeved on the supporting block, and the top end of the supporting block is provided with a first through hole corresponding to the opening; the fixing seat is used for bearing the supporting block, and is also provided with a bulge which is arranged corresponding to the groove; the air cylinder is arranged on the fixed seat and is accommodated in the supporting block, a blind rivet is arranged at the output end of the air cylinder, the blind rivet corresponds to the opening, and the blind rivet can extend out of the first through hole and the opening; and the cover plate is used for being connected with the blind rivet when the product is sleeved on the supporting block and is matched with the supporting block to clamp the product.

Optionally, the error of the center position of the product from the rotation center of the spindle is controlled within 0.02 mm.

Optionally, a height difference between the rotation center of the spindle and the rotation center of the grinding wheel in the vertical direction is controlled within 0.02 mm.

Optionally, the width of the grinding wheel is greater than the product width.

Optionally, the turning and grinding machine further comprises a cutter repairing pen, and the cutter repairing pen is arranged on one side, close to the grinding wheel, of the main shaft. Compared with the prior art, the application has at least the following beneficial effects:

this application sets up through the cooperation of the recess on protruding and the product for the product is at the in-process of processing, and the lateral wall obtains two-way support, can not be because the vibration of rotatory in-process causes the lateral wall surface of product to produce unnecessary knife line.

Drawings

Fig. 1 is a schematic view of a grinding machine and a product according to an embodiment of the present disclosure.

Fig. 2A is a schematic view of the fixing jig, the product and the grinding wheel in fig. 1.

Fig. 2B is another schematic view of the fixing jig, the product and the grinding wheel in fig. 1.

FIG. 3 is a schematic view of a product according to an embodiment of the present application.

Fig. 4 is an exploded view of a fixing jig according to an embodiment of the present disclosure.

Fig. 5 is a partially assembled schematic view of the fixing jig in fig. 4.

Fig. 6 is a schematic view of the fixing base in fig. 4.

FIG. 7 is a schematic view of the support block of FIG. 4.

Fig. 8 is a schematic view of the guide block of fig. 4.

Fig. 9 is a schematic view of the cover plate of fig. 4.

Fig. 10 is a schematic view of the connection block of fig. 9.

Fig. 11 is another schematic view of the connector block of fig. 9.

Fig. 12 is a schematic view illustrating the fixing jig of fig. 4 being engaged with a product.

Fig. 13 is another schematic view illustrating the fixing jig of fig. 4 being engaged with a product.

Fig. 14 is another schematic view illustrating the fixing jig of fig. 4 being engaged with a product.

Description of the main elements

Grinding machine 100

Frame 1

First feeding mechanism 2

Second feeding mechanism 3

Main shaft 4

Fixing jig 5

Connecting shaft 51

Fixed seat 52

Base 521

First step portion 522

First plane 5221

First side 5222

Projection 5223

Second step portion 523

Second plane 5231

Second side 5232

Cylinder 53

Blind rivet 531

Contact end 5311

Support block 54

First bump 541

First through hole 542

Guide block 55

Main body 551

Extension 552

First recess 553

Second via 554

Cover plate 56

Cover 561

Third via 5611

Connecting block 562

First face 5621

Second face 5622

Second recessed portion 5623

Sliding hole 5624

First end 5625

Second end 5626

Second bump 5627

Fourth via 5628

End cap 563

Handle 564

Connecting post 57

Product 6

Bottom wall 61

Opening 611

Side wall 62

Inner side wall 621

Outer side wall 622

Groove 623

Electric motor 7

Grinding wheel 8

Knife repairing pen 9

The following detailed description will further illustrate the present application in conjunction with the above-described figures.

Detailed Description

In order that the above objects, features and advantages of the present application can be more clearly understood, a detailed description of the present application will be given below with reference to the accompanying drawings and detailed description. In addition, the embodiments and features of the embodiments of the present application may be combined with each other without conflict. In the following description, numerous specific details are set forth to provide a thorough understanding of the present application, and the described embodiments are merely a subset of the embodiments of the present application, rather than all embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes all and any combination of one or more of the associated listed items.

In various embodiments of the present application, for convenience in description and not limitation, the term "coupled" as used in the specification and claims of the present application is not limited to physical or mechanical connections, either direct or indirect. "upper", "lower", "above", "below", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.

Referring to FIG. 1, the present application provides a grinder 100 for contouring a product 6. The turning and grinding machine 100 comprises a frame 1, a first feeding mechanism 2, a second feeding mechanism 3, a main shaft 4, a fixing jig 5, a motor 7, a grinding wheel 8 and a sharpening pen 9.

The first feeding mechanism 2 and the second feeding mechanism 3 are both arranged on the frame 1. The main shaft 4 is provided on the first feed mechanism 2, and is movable in a first direction (for example, a Z-axis direction) by the first feed mechanism 2. The motor 7 is disposed on the second feeding mechanism 3 and is movable in a second direction (for example, Y-axis direction) by the second feeding mechanism 3.

The fixing jig 5 is arranged at the output end of the main shaft 4 and used for fixing the product 6. The main shaft 4 can provide rotary power during operation to drive the fixed jig 5 and the product 6 to rotate.

The grinding wheel 8 is arranged at the driving end of the motor 7 and corresponds to the fixing jig 5. The motor 7 can drive the grinding wheel 8 to rotate during working so as to grind the product 6. It can be understood that the second feeding mechanism 3 can move in the Y-axis direction while the grinding wheel 8 rotates, so that the grinding wheel 8 can perform the grinding process according to the contour of the product 6.

In some embodiments, the width L1 of the grinding wheel 8 in the Z-axis direction is greater than the width L2 of the product 6. Therefore, the product 6 or the grinding wheel 8 does not need to move in the Z-axis direction, the grinding wheel 8 can finish machining the outline of the product 6, and machining efficiency is further improved.

The cutter repairing pen 9 is arranged on one side of the main shaft 4 close to the grinding wheel 8. The material of the pencil sharpener 9 is, for example, diamond. The knife repairing pen 9 can contact with the grinding wheel 8 and repair the grinding wheel 8 under the action of the first feeding mechanism 2, so that the appearance quality of the product 6 is guaranteed.

Referring to fig. 2A and 2B together, fig. 2A is a schematic diagram of the product 6 and the grinding wheel 8 in a first position, and fig. 2B is a schematic diagram of the product 6 and the grinding wheel 8 in a second position.

In some embodiments, the symmetry of the outer shape of the product 6 with respect to the rotational center of the main shaft 4 (see fig. 1) is controlled to be within 0.02mm, that is, the error of the center position a of the product 6 from the rotational center of the main shaft 4 is controlled to be within 0.02 mm. The height difference between the rotation center of the main shaft 4 and the rotation center B of the grinding wheel 8 in the vertical direction (i.e., Y-axis direction) is controlled to be within 0.02 mm.

It will be appreciated that the first position is when the grinding wheel 8 is working the middle of the side wall of the product 6. The second position is a position in which the product 6 in the first position has been rotated 45 degrees.

Since the grinding wheel 8 moves in the X-axis direction during the rotation of the product 6, the distance from the grinding wheel 8 to the center position a of the product 6 varies between the first position and the second position. In the first position, a projection distance from the center position a of the product 6 to the sidewall of the product 6 in the X-axis direction is a first length M. In the second position, the projection distance from the center position a of the product 6 to the sidewall of the product 6 in the X-axis direction is a second length N. The difference between the first length M and the second length N is within an error of 0.01mm from the distance the grinding wheel 8 moves in the X-axis direction.

It can be understood that the precision of the grinding process of the grinding wheel 8 on the product 6 can be improved by controlling the relative positions of the center position a of the product 6 or the rotation center B of the grinding wheel 8 and the rotation center of the spindle 4 and the relative positions of the center position a of the product 6 and the rotation center B of the grinding wheel 8.

Referring to fig. 3, in the embodiment of the present application, the product 6 includes a bottom wall 61 and a side wall 62 surrounding the bottom wall 61, and the bottom wall 61 and the side wall 62 together form a cavity (not shown). The bottom wall 61 is provided with an opening 611. The sidewall 62 includes an inner sidewall 621 and an outer sidewall 622 corresponding to the inner sidewall 621. The side wall 62 is provided with a plurality of grooves 623 at the end opening thereof away from the bottom wall 61, i.e. the connecting part of the side wall 62 between the inner side wall 621 and the outer side wall 622, and the grooves 623 are distributed at the end opening of the side wall 62 around the product 6. It is understood that the opening 611 and the recess 623 may be formed as needed by the process.

Please refer to fig. 4 and fig. 5, which are schematic structural diagrams of the fixing jig 5. The fixing jig 5 includes a connecting shaft 51, a fixing seat 52, an air cylinder 53, a supporting block 54, a guiding block 55 and a cover plate 56. The connecting shaft 51 is used for connecting the spindle 4 and other components of the fixing jig 5. Specifically, one end of the connecting shaft 51 is disposed at the output end of the main shaft 4, and the other end is connected to the fixing seat 52. The supporting block 54 is disposed on the fixing seat 52, and the peripheral wall of the supporting block 54 is used for abutting against the side wall 62 of the product 6 when the product 6 is sleeved on the supporting block 54. The supporting block 54 includes a cavity (not shown), and the cylinder 53 and the guiding block 55 are disposed in the cavity. The cylinder 53 is arranged on the fixed seat 52 in a colleague mode, and the output end of the cylinder 53 is provided with a blind rivet 531. The pull stud 531 includes a contact end 5311. A contact end 5311 is provided at an end of the blind rivet 531 remote from the cylinder 53. Illustratively, the contact end 5311 is approximately cylindrical. The blind rivet 531 is able to protrude through the support block 54 and the opening 611 of the product 6. The guide block 55 is disposed on the fixing base 52 through the connection post 57, and the guide block 55 is located between the cylinder 53 and one end of the support block 54 that is not connected to the fixing base 52. That is, the guide block 55 is located on a side of the cylinder 53 away from the fixing base 52. The cover plate 56 is adapted to be connected to a rivet 531 (e.g., contact end 5311) when the product 6 is received on the support block 54, and is engaged with the support block 54 to hold the product between the support block 54 and the cover plate 56.

Referring to fig. 6, the fixing base 52 includes a base 521, a first step portion 522 and a second step portion 523.

The base 521 is in direct contact with the connecting shaft 51, and the first step portion 522 is provided on the base 521. The first step 522 includes a first plane 5221 and a first side 5222, and the first plane 5221 and the first side 5222 are substantially perpendicular to each other. The first plane 5221 is provided with a plurality of protrusions 5223, and these protrusions 5223 are arranged to correspond to the grooves 623 of the product 6. The first side surface 5222 has one end connected to the first plane 5221 and the other end connected to the base 521. The profile of the first side 5222 in a plane defined by the X-axis and the Y-axis coincides with the profile of the outer sidewall 622 of the product 6.

The second step portion 523 is formed on a side of the first step portion 522 away from the base 521. The second step portion 523 includes a second plane 5231 and a second side surface 5232. The second plane 5231 and the second side 5232 are substantially perpendicular. The air cylinder 53 (see fig. 5) is disposed on the second plane 5231. Second side 5232 has one end connected to second planar surface 5231 and the other end connected to first stepped portion 522. The contour of the second side 5232 in a plane defined by the X-axis and the Y-axis coincides with the contour of the inner sidewall 621 of the product 6.

The first step portion 522 is used to carry the product 6 when the product 6 is mated with the fixing jig 5. Specifically, the side wall 62 directly contacts the first plane 5221, and the protrusion 5223 is retained in the recess 623 formed in the side wall 62. At the same time, the inner sidewall 621 of the product 6 abuts against the second side 5232. In this way, the product 6 is fixed in the plane constituted by the X-axis and the Y-axis.

It will be appreciated that the arrangement of the protrusions 5223 and the grooves 623 allows the side wall 62 to be supported bi-directionally during the machining of the product 6, without generating unnecessary knurls on the surface of the outer side wall 622 of the product 6 due to vibration during rotation.

Referring to fig. 14, in some embodiments, the groove 623 is a V-shaped groove with two inclined surfaces, and the protrusion 5223 is correspondingly configured to have two opposite inclined surfaces. The design of V-arrangement groove makes product 6 place on fixed tool 5 back recess 623 and protruding 5223 can be inseparabler contact to guarantee the accuracy nature of product 6 position on fixed tool 5, and then promote the precision of processing.

Referring also to fig. 7, the support block 54 is similar in shape to the products 6, but is smaller in size than the products 6 so that the products 6 can nest on the support block 54. The support blocks 54 are used for supporting the products 6 for grinding. The supporting block 54 is provided with a first projection 541 corresponding to the opening 611 of the product 6.

The first tab 541 is capable of passing through the opening 611 of the product 6 when the product 6 is nested on the support block 54. A first through hole 542 is formed in a center of the first bump 541.

It is understood that the shape of the first bump 541 matches the shape of the opening 611 of the product 6, and is not limited herein. Illustratively, when the opening 611 is substantially circular in shape, the first bump 541 is also substantially circular in profile. The shape of the first through hole 542 may be, for example, square.

Referring to fig. 8, the guide block 55 includes a main body 551 and an extending portion 552. One end of the connection post 57 (see fig. 5) is fixed on the fixing base 52, and the other end is connected with the main body 551. The extending portion 552 is disposed on a side of the main body portion 551 away from the fixing base 52. The shape of the extension 552 matches the shape of the first through hole 542, and the shape of the extension 552 is square, for example. A first recess 553 is formed by recessing a surface of the extension 552 away from the body 551 in the body direction (i.e., the negative Z-axis direction). The first recess 553 has a second through hole 554 formed therein.

The guide block 55 is disposed above the air cylinder 53 (see fig. 5), and the second through hole 554 is disposed corresponding to the rivet 531 at the output end of the air cylinder 53. The blind rivet 531 can pass through the second through hole 554 when the air cylinder 53 operates.

Referring to fig. 9, the cover plate 56 includes a cover body 561, a connecting block 562, an end cap 563, and a handle 564. The cover 561 has a third through hole 5611. The connection block 562 is disposed on the cover body 561, and is disposed corresponding to the third through hole 5611, for example, disposed in the third through hole 5611. An end cap 563 is provided on the side of the connection block 562 remote from the cover 561. A handle 564 is provided on the cover 561 for manipulating the cover 56.

Referring to fig. 10 and 11, the connecting block 562 includes a first surface 5621 and a second surface 5622. The first surface 5621 is a surface of the connection block 562 which is away from the cover 561, and the first surface 5621 is recessed in a direction of the cover 561 (i.e., a negative Z-axis direction) to form a second recessed portion 5623. A sliding hole 5624 is formed in the second recess 5623, and the sliding hole 5624 penetrates the first face 5621 and the second face 5622 for the pull stud 531 to pass through. The slide hole 5624 is substantially gourd-shaped and includes a first end 5625 and a second end 5626 connected thereto. Wherein the first end 5625 is a large diameter end and the second end 5626 is a small diameter end.

The second face 5622 is provided with a second tab 5627 intended to cooperate with the first recess 553 (see fig. 8) when the cover 56 is applied on the bottom wall 61 of the product 6, to fix the position of the cover 56. A second tab 5627 is disposed corresponding to the second end 5626. The second tab 5627 defines a fourth through hole 5628 having a shape identical to the second end 5626. Thus, the second end 5626 of the sliding bore 5624 is in communication with the fourth through bore 5628.

Referring to fig. 4, in this embodiment, the diameter of first end 5625 is larger than the diameter of contact end 5311 of rivet 531. The diameter of second end 5626 is smaller than the diameter of contact end 5311 of rivet 531.

The working principle of the fixing fixture 5 is described in detail below with reference to fig. 12 to 14.

Referring to fig. 12 and 14, the products 6 are aligned and sleeved on the supporting blocks 54. Due to the arrangement of the protrusions 5223 and the grooves 623, the product 6 is fixed in a plane defined by the X-axis and the Y-axis. The air cylinder 53 is then operated to drive the blind rivet 531 in extension. Cover 56 is then placed over bottom wall 61 of the product with first end 5625 of sliding hole 5624 aligned with rivet 531. As such, contact end 5311 of pull stud 531 extends from first end 5625.

Referring to fig. 13 and 14, the cover 56 is slid along the positive X-axis direction by the handle 564 (see fig. 13), such that the second end 5626 is aligned with the rivet 531. Finally, the output end of the air cylinder 53 is retracted, and the contact end 5311 of the rivet 531 is pulled in the direction of the air cylinder 53 (i.e., in the negative Z-axis direction) (see fig. 14). Since the bore of the second end 5626 is smaller than the diameter of the contact end 5311, the contact end 5311 is held in the second recess 5623, and the connecting block 562 is pressed toward the cylinder 53 by the contact end 5311. In this manner, the cover plate 56 presses the product 6 against the support block 54 in the Z-axis direction.

The protrusion 5223 is arranged to cooperate with the groove 623 on the product 6, so that the side wall 62 is supported bidirectionally during the processing of the product 6, and unnecessary knife lines are not generated on the surface of the outer side wall 622 of the product 6 due to vibration during rotation.

Finally, it should be noted that the above embodiments are only intended to illustrate the technical solutions of the present application and not to limit the same, and although the present application is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.

Claims (10)

1. The utility model provides a fixed tool for fixed product, the product includes the diapire and encircles the lateral wall that the diapire set up all around, be provided with the opening on the diapire, the lateral wall is not connected to the tip of diapire is provided with the recess, its characterized in that, fixed tool includes:

the peripheral wall of the supporting block is used for abutting against the side wall when the product is sleeved on the supporting block, and the top end of the supporting block is provided with a first through hole corresponding to the opening;

the fixing seat is used for bearing the supporting block, and is also provided with a bulge which is arranged corresponding to the groove;

the air cylinder is arranged on the fixed seat and contained in the supporting block, a blind rivet is arranged at the output end of the air cylinder, the blind rivet is arranged corresponding to the opening and can extend out of the first through hole and the opening; and

the cover plate is used for being connected with the blind rivet when the product is sleeved on the supporting block and matched with the supporting block to clamp the product.

2. The fixing jig according to claim 1, wherein the fixing jig further comprises a guide block, the guide block is accommodated in the support block and located on a side of the cylinder away from the fixing base, and the guide block comprises:

the main body part is arranged on the fixed seat; and

the extension part is positioned on one side, far away from the fixing seat, of the main body part, the extension part is arranged corresponding to the first through hole, a first sunken part is formed in a surface, far away from the main body part, of the extension part and sunken towards the main body part, a second through hole is formed in the first sunken part, and the second through hole is used for the blind rivet to penetrate through.

3. The fixture of claim 1, wherein the cover plate comprises:

the cover body is provided with a third through hole;

the connecting block is arranged on the cover body and corresponds to the third through hole, the connecting block comprises a first surface and a second surface, the first surface is the surface of the connecting block, which is far away from the cover body, the first surface is sunken towards the direction of the cover body to form a second sunken part, a sliding hole is formed in the second sunken part, the sliding hole penetrates through the first surface and the second surface and is used for the blind rivet to pass through, the sliding hole comprises a first end and a second end which are connected, the diameter of the first end is larger than the diameter of the blind rivet, which is far away from the cylinder, and the diameter of the second end is smaller than the diameter of the blind rivet, which is far away from the cylinder; and

and the end cap is arranged on one side of the connecting block, which is far away from the cover body.

4. The fixing jig according to claim 1, further comprising a connecting shaft, wherein one end of the connecting shaft is connected to the fixing base, and the other end of the connecting shaft is connected to a main shaft for providing rotary power to the fixing jig.

5. The fixing jig of claim 1, wherein the fixing base comprises:

a base seat, a plurality of fixing holes and a plurality of fixing holes,

the first step part is arranged on the base and comprises a first plane and a first side surface, one end of the first side surface is connected with the first plane, the other end of the first side surface is connected with the base, the bulge is arranged on the first plane, and the outline of the first side surface is consistent with the outline of the outer side of the side wall of the product; and

the second step portion is arranged on one side, far away from the base, of the first step portion and comprises a second plane and a second side face, one end of the second side face is connected with the second plane, the other end of the second side face is connected with the first step portion, and the outline of the second side face is consistent with the inner-measuring outline of the side wall of the product.

6. A grinding machine, characterized in that it comprises:

a frame;

the first feeding mechanism is arranged on the rack;

the second feeding mechanism is arranged on the rack;

the main shaft is arranged on the first feeding mechanism and can move along a first direction under the driving of the first feeding mechanism, and the main shaft is used for driving the product to rotate;

the fixing jig is arranged on the main shaft;

the motor is arranged on the second feeding mechanism and can move along a second direction under the driving of the second feeding mechanism, and the second direction is perpendicular to the first direction; and

the grinding wheel is connected with the motor and can rotate under the driving of the motor, and the grinding wheel is arranged corresponding to the fixed jig;

wherein, the fixing jig is the fixing jig according to any one of claims 1 to 5.

7. A vehicle grinding machine according to claim 6 wherein the error of the position of the centre of the product from the centre of rotation of the spindle is controlled to within 0.02 mm.

8. A car grinder as claimed in claim 6, wherein the difference in height between the rotation center of the spindle and the rotation center of the grinding wheel in the vertical direction is controlled to be within 0.02 mm.

9. A car grinding machine as claimed in claim 6, wherein the width of said grinding wheel is greater than said product width.

10. A car grinder as claimed in claim 6, wherein the car grinder further comprises a sharpening pen disposed on a side of the spindle adjacent the grinding wheel.

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