CN111590103A

CN111590103A - Frock clamp of car processing motor stator casing tang is exclusively used in

Info

Publication number: CN111590103A
Application number: CN202010354118.XA
Authority: CN
Inventors: 祝正东; 王春燕
Original assignee: Suzhou Lego Motors Co ltd
Current assignee: Suzhou Lego Motors Co ltd
Priority date: 2020-04-29
Filing date: 2020-04-29
Publication date: 2020-08-28

Abstract

The utility model provides a frock clamp of car processing motor stator casing tang is exclusively used in, frock clamp includes plug, radial locking mechanism, bloated cover and fixing base. The mandrel is a rotating body, the front end of the mandrel along the axis of the mandrel is a first frustum, the rear end of the mandrel is a second frustum, and the two frustums are coaxially arranged in a back-to-back mode. The radial locking mechanism is sleeved on the periphery of the first frustum, and the locking blocks are uniformly arranged along the circumferential direction to define and form a first taper hole; the first taper hole is matched with the first taper surface of the first frustum in an alignment mode. The periphery of second frustum in the plug is located to the cover that expands. The core rod also comprises a middle section, and the middle section is positioned between the first frustum and the second frustum; a through hole is formed in the fixing seat, the middle section of the core rod penetrates through the through hole, and the rear end face of the fixing seat is attached to the front end face of the expansion sleeve. By adopting the invention, the problems of poor processing precision, low reliability and low production efficiency in the prior art can be effectively solved.

Description

Frock clamp of car processing motor stator casing tang is exclusively used in

Technical Field

The invention relates to the field of machining, in particular to a tool clamp special for turning a spigot of a motor stator shell.

Background

In recent years, with the rapid development of motor technology, people have higher and higher quality requirements on motors, and as is well known, a stator and a rotor are main components of the motor, wherein end covers are arranged at two ends of the stator, and bearings on the end covers are matched with a rotating shaft of the rotor so that the rotor rotates in the stator. However, only the rotor and the stator core are coaxial, so that the gap between the rotor and the stator core can be uniform, and the motor is ensured to have better performance. In order to ensure the coaxiality, the spigots at the two ends of the stator shell are usually machined on a special machine tool at present, and the coaxiality of the inner diameter of the stator core and the spigots at the two ends can directly influence the performance of the motor, so that the lathing of the spigots of the stator shell of the motor becomes a necessary finish machining process in the motor machining.

However, the prior art has certain disadvantages. At first, the present more adoption does not have bloated cover car tang frock, and this type of frock is applicable to the casing processing before emboliaing the iron core winding, and however, the stator is formed by stator casing and stator core hot jacket interference fit usually, produces deformation easily in cup jointing and cooling process, can direct influence the axiality. Meanwhile, the expansion-free sleeve turning seam allowance tooling is more suitable for single-end machining needing secondary clamping, namely, a stator is fixed firstly to machine a seam allowance at one end of the stator, and then the stator is disassembled and clamped in a head-off mode, so that machining of the seam allowance at the other end can be carried out. And the secondary clamping will influence the coaxiality of the spigots at the two ends of the stator and the verticality of the inner hole and the end surface.

Therefore, the coaxiality of the inner diameter of the stator core and the rabbets at the two ends can not be ensured by adopting the prior art, so that the motor performance is poor, the noise is high and the vibration is obvious in the operation process, the bearing is seriously abraded, the service life of the bearing is influenced, and the reliability is low. In addition, the prior art has low production efficiency, and consumes time and labor.

In view of the above, the present invention is to design a tooling fixture for lathing a seam allowance of a stator casing of a motor, which can overcome the above-mentioned shortcomings of the prior art.

Disclosure of Invention

The invention provides a special tool clamp for turning a spigot of a motor stator shell, and aims to solve the problems of poor machining precision, low reliability and low production efficiency in the prior art.

In order to achieve the purpose, the invention adopts the technical scheme that: a special tool clamp for lathing a spigot of a motor stator shell is disclosed, wherein a stator comprises the stator shell, a stator core and a stator winding; the innovation lies in that: the tool clamp comprises a core rod, a radial locking mechanism, an expansion sleeve and a fixed seat, wherein the radial locking mechanism and the fixed seat are connected with a machine tool in a positioning mode and all correspond to the front end of the core rod.

The core rod is a rotating body, the front end of the core rod along the axis of the core rod is a first frustum, the rear end of the core rod is a second frustum, the two frustums are coaxially arranged, and the lower bottom surfaces of the two frustums are back to back; the taper of the first frustum is larger than that of the second frustum; the peripheral side surface of the first frustum is a first conical surface, and the peripheral side surface of the second frustum is a second conical surface.

The radial locking mechanism is sleeved on the periphery of a first frustum in the core rod and consists of at least three locking blocks; the locking blocks are uniformly arranged along the circumferential direction of the axis of the mandrel, so that a first taper hole is defined and formed in the center of the radial locking mechanism; the first taper hole is matched with the first conical surface of the first frustum in an alignment mode.

The expansion sleeve is sleeved on the periphery of the second conical table in the core rod; the expansion sleeve consists of at least three expansion blocks; the expansion blocks are uniformly arranged at equal angles along the circumferential direction of the mandrel axis, so that a second taper hole is defined and formed in the center of the expansion sleeve, and the second taper hole is in contraposition fit with a second taper surface of the second taper platform.

The radial locking mechanism is driven by a driving mechanism to enable each locking block to generate inward and outward radial displacement so as to form two states of contraction and expansion of the first taper hole; under the contraction state of the first taper hole, the inner side surface of the first taper hole is attached to and extrudes the first conical surface of the first frustum, and the core rod is driven to move forwards; the second conical surface of the second conical table is attached to and extrudes the inner side surface of the second conical hole in the expansion sleeve, and then the forward displacement of the core rod drives each expansion block to perform outward radial displacement, so that the expansion sleeve and the stator are in radial interference fit, and the stator is positioned in the axial direction.

The relevant content in the above technical solution is explained as follows:

1. in the scheme, the seam allowances are positioned at the front end and the rear end of the stator shell.

2. In the scheme, in the 'lower bottom surfaces of the first frustum and the second frustum are opposite', the definition of the 'lower bottom surface' is standard, namely the bottom surface with larger radius in the frustum is not the bottom surface in the vertical direction in the scheme; the reverse is that the lower bottom surface of the first frustum faces forward, and the lower bottom surface of the second frustum faces backward. The two frustum platforms are coaxially arranged, which means that the geometric centers of the upper and lower bottom surfaces of the two frustum platforms are on the same straight line.

3. In the scheme, the radial locking mechanism is sleeved on the periphery of the first frustum in the core rod, and the radial locking mechanism and the core rod are in clearance fit in a non-working state.

4. In this scheme, preferably, the middle section of plug is a cylinder to the cooperation between the external member of being convenient for reduces wearing and tearing, improves the axiality of tang processing.

5. In the scheme, the mandrel further comprises a middle section, and the middle section is positioned between the first frustum and the second frustum; the fixed seat is provided with a through hole, the middle section of the core rod is arranged in the through hole in a penetrating manner, and the rear end face of the fixed seat is attached to the front end face of the expansion sleeve; the through hole consists of a clamping hole positioned at the front section and an avoiding hole positioned at the rear section, and the clamping hole and the avoiding hole are communicated in the axial direction; the diameter of the clamping hole corresponds to the diameter of the middle section of the core rod, and the diameter of the avoiding hole is larger than the diameter of the middle section of the core rod.

6. In this embodiment, preferably, the adjacent expansion blocks are connected by gluing at the gap. The adhesive connection at the gap helps to stabilize the elasticity of the expansion sleeve, thereby being beneficial to improving the precision and consistency of the spigot processing.

7. In this scheme, it is further preferred that the front end of each expansion block is fixedly connected with the front end of the expansion block adjacent to one side of the expansion block in the circumferential direction, and the rear end of each expansion block is fixedly connected with the rear end of the expansion block adjacent to the other side of the expansion block in the circumferential direction, so that the formed expansion sleeve is of a turn-back structure. The adjacent expansion blocks are connected by glue at the gap between the adjacent expansion blocks. The folding back structure of the expansion sleeve and the viscose connection at the gap position are beneficial to stabilizing the elasticity of the expansion sleeve, thereby being beneficial to improving the precision and consistency of the seam allowance processing.

8. In the scheme, the automobile tail seat further comprises a tail seat, wherein a fixed convex end is arranged at one axial end of the tail seat; aiming at the fixed convex end, a fixed groove is formed in the rear end face of the core rod; under the contraction state of the first taper hole, the tailstock is positioned on the machine tool, and the fixed convex end is matched with the fixed groove in a clamping mode. The structure is used for supporting the core rod, so that the core rod and the through hole are coaxially arranged.

9. In the scheme, the protective cover also comprises a second protective cover, the second protective cover comprises a circumferential ring and a radial ring, and the outer edge of the radial ring is fixedly connected with one end of the circumferential ring along the axial direction; in an assembly state, the second protective cover is sleeved on the core rod, the radial ring is attached between the stator and the fixed seat, and the circumferential ring is attached to the inner wall of the front end of the stator. The structure is used for assisting axial positioning and preventing metal scraps from polluting the stator.

10. In the scheme, the protective device preferably further comprises a first protective cover, wherein the first protective cover comprises a protective plate and a side ring which is fixedly connected with the periphery of the protective plate correspondingly; the protection plate is provided with a tailstock trepanning, and the first protection cover is sleeved and positioned on the tailstock through the tailstock trepanning; in an assembly state, the protection plate and the tailstock cover the rear end face of the stator together, and the side ring is attached to the inner wall of the rear end of the stator shell. The structure is used for preventing metal scraps from polluting the stator.

11. In the scheme, the positioning device preferably further comprises a movably arranged positioning block; in an assembly state, before the radial locking mechanism is in a contraction state, the front end face of the positioning block is attached to the fixed seat, and the rear end face of the positioning block is attached to the front end face of the stator; and when the radial locking mechanism is in a contraction state, the positioning block is removed. The positioning block is placed to limit the axial position of the stator, so that the processing precision and consistency of the spigot are improved; the positioning block is taken out to facilitate the processing of the spigot. Further preferably, the positioning block is made of a magnetic material.

12. In this embodiment, preferably, the avoiding hole is a taper hole, and a front end aperture of the taper hole is smaller than a rear end aperture.

The design principle and the beneficial effects of the invention are as follows:

the main principle of the invention is that the first taper hole of the radial locking mechanism has two states of contraction and expansion in the radial direction by the drive of the drive mechanism configured on the machine tool: under the contraction state of the first taper hole, the inward radial displacement of the locking block drives the core rod to generate forward axial displacement, and the axial displacement drives the expansion block of the expansion sleeve to generate outward radial displacement, so that the expansion sleeve is in interference fit with a stator sleeved on the expansion sleeve, and the stator is positioned; in the expansion state of the first taper hole, the expansion sleeve shrinks due to the deformation recovery, and the shrinkage drives the core rod to generate backward axial displacement, so that the core rod is displaced backward to the axial position before the shrinkage state.

The invention can effectively solve the problems of poor processing precision, low reliability and low production efficiency in the prior art.

Firstly, adopt this technical scheme can realize the processing of stator both ends tang through a clamping, and the operation after stator casing, iron core and winding cup joint, improved coaxial machining precision, reliability and production efficiency than prior art, solved prior art's basic problem. Secondly, the core rod is provided with the first cone table and the second cone table, and a radial locking mechanism and an expansion sleeve are matched, so that three-step linkage from radial displacement to axial displacement and then to radial displacement can be realized, and compared with a conventional expansion sleeve technology in which a driving device directly drives the core rod to move from the axial displacement to the radial displacement, the stability and the reliability of linkage can be obviously improved, and the coaxiality of a spigot can be effectively improved; meanwhile, the three-step linkage is combined with a pulling design, and compared with a conventional pushing design, the three-step linkage type three-step mechanism is higher in stability and reliability and higher in precision. Thirdly, the folding structure of the expansion sleeve and the adhesive connection at the gap are beneficial to stabilizing the elasticity of the expansion sleeve; the arrangement of the positioning block ensures the precision of axial positioning. Both of which are beneficial to improving the precision of the seam allowance processing and the consistency of the product quality. And fourthly, the tailstock is arranged on the machine tool and used for supporting the core rod in the machining process, so that the core rod and the through hole are coaxially arranged, the vibration is favorably reduced, and the service life of the tool can be prolonged.

In addition, combine the setting of first protection casing and second protection casing, can also effectively prevent that the metal fillings that produce from polluting the stator in the course of working, be favorable to the process quality management and control of product.

Drawings

FIG. 1 is a schematic perspective view of a tooling fixture with a motor stator assembled therein according to the present invention;

FIG. 2 is an axial sectional view of the first tapered bore of the present invention in an expanded state;

FIG. 3 is an axial sectional view of the first taper hole of the present invention when the spigot is machined in a contracted state;

FIG. 4 is a schematic perspective view of a work fixture according to the present invention;

FIG. 5 is an axial cross-sectional view of FIG. 4;

FIG. 6 is a schematic perspective view of a mandrel of the present invention;

FIG. 7 is an axial cross-sectional view of FIG. 6;

FIG. 8 is a schematic perspective view of a fixing base according to the present invention;

FIG. 9 is an axial cross-sectional view of FIG. 8;

FIG. 10 is a schematic perspective view of a radial locking mechanism according to the present invention;

FIG. 11 is a right side view of FIG. 10;

FIG. 12 is an axial cross-sectional view of FIG. 10;

FIG. 13 is a schematic perspective view of the expanding sleeve of the present invention;

FIG. 14 is a left side view of the expansion sleeve of the present invention;

FIG. 15 is an axial cross-sectional view of the expansion sleeve of the present invention;

FIG. 16 is a schematic perspective view of an expansion sleeve according to another embodiment of the present invention;

FIG. 17 is an axial cross-sectional view of FIG. 16;

FIG. 18 is a schematic perspective view of a tailstock according to the present invention;

FIG. 19 is a schematic perspective view of two positioning blocks of the present invention;

FIG. 20 is a schematic perspective view of a first shield according to the present invention;

FIG. 21 is an axial cross-sectional view of FIG. 20;

FIG. 22 is a schematic perspective view of a second shield according to the present invention;

FIG. 23 is an axial cross-sectional view of FIG. 22;

FIG. 24 is a schematic perspective view of a stator according to an embodiment of the present invention;

fig. 25 is an axial cross-sectional view of 24.

In the above drawings: 1. a core rod; 101. a first conical surface; 102. a second tapered surface; 103. fixing the groove; 2. a radial locking mechanism; 201. a locking block; 202. a first taper hole; 3. expanding the sleeve; 301. expanding blocks; 302. a second taper hole; 303. a foldback structure; 3031. a fabrication hole; 4. a fixed seat; 401. a through hole; 4011. a clamping hole; 4012. avoiding holes; 5. a tailstock; 501. fixing the convex end; 6. positioning blocks; 7. a first shield; 701. a protection plate; 7011. a tailstock trepanning; 702. a side ring; 8. a second shield; 801. a circumferential ring; 802. a radial ring; 9. a stator; 901. a stator housing; 9011. stopping the opening; 902. a stator core is provided.

Detailed Description

The invention is further described with reference to the following figures and examples:

example (b): frock clamp of car processing motor stator casing tang is exclusively used in

Referring to fig. 1 to 3, fig. 24 and fig. 25, a tooling fixture for lathing a seam allowance of a stator casing of a motor is disclosed, in which a stator 9 includes the stator casing 901, a stator core 902 and a stator winding. The tooling fixture comprises a core rod 1, a radial locking mechanism 2, an expansion sleeve 3 and a fixed seat 4, wherein the radial locking mechanism 2 and the fixed seat 4 are connected with a machine tool in a positioning mode and correspond to one end of the core rod 1. In the present invention, the one end of the mandrel bar 1 is defined as a front end, and the other end is defined as a rear end, and the front-rear direction described later is defined as a front-rear direction in order along the axial direction. In addition, as shown in fig. 25, in this embodiment, the spigot 9011 has two positions, which are respectively located at the front end and the rear end of the stator casing and are step-shaped around the circumference.

Referring to fig. 6 and 7, the mandrel 1 is a rotating body, and the front end of the mandrel 1 along the axis thereof is a first frustum and the rear end thereof is a second frustum. In this embodiment, the two conical tables are two circular truncated cones. The two frustum are coaxially arranged, and the lower bottom surfaces of the two frustum are back to back. The taper of the first frustum is larger than that of the second frustum; the peripheral side surface of the first frustum is a first conical surface 101, and the peripheral side surface of the second frustum is a second conical surface 102. In the present embodiment, the first tapered surface 101 and the second tapered surface 102 are surfaces of revolution.

Referring to fig. 1 and 2, the radial locking mechanism 2 is sleeved on the outer periphery of the first frustum of the mandrel 1, and in a non-working state, the two are in clearance fit. As shown in fig. 10 to 12, the radial locking mechanism 2 is composed of six locking blocks 201; the locking blocks 201 are uniformly arranged along the circumferential direction of the mandrel axis, so that a first taper hole 202 is defined at the center of the radial locking mechanism 2; the first taper hole 202 is aligned and matched with the first taper surface 101 of the first frustum.

Referring to fig. 4 and 5, the expansion sleeve 3 is sleeved on the outer periphery of the second cone of the mandrel 1; as shown in fig. 13 to 15, the expansion sleeve 3 is composed of twelve expansion blocks 301; the expansion blocks 301 are uniformly arranged at equal angles along the circumferential direction of the mandrel axis, so that a second taper hole 302 is defined in the center of the expansion sleeve 3, and the second taper hole 302 is aligned with the second taper surface 102 of the second taper table. Adjacent expansion blocks 301 are joined at the gap therebetween using glue. The adhesive connection at the gap helps to stabilize the elasticity of the expansion sleeve 3, thereby being beneficial to improving the precision and consistency of the processing of the spigot 9011.

Referring to fig. 6 and 7, the mandrel 1 further includes a middle section in a cylindrical shape, which is located between the first frustum and the second frustum; as shown in fig. 5 and 8, a through hole 401 is formed in the fixing seat 4, the middle section of the mandrel 1 is inserted into the through hole 401, and the rear end surface of the fixing seat 4 is attached to the front end surface of the expansion sleeve 3; as shown in fig. 8 and 9, the through hole 401 is composed of a holding hole 4011 located at the front section and an avoiding hole 4012 located at the rear section, and the holding hole 4011 and the avoiding hole 4012 are axially communicated; the diameter of the clamping hole 4011 corresponds to the diameter of the middle section of the core rod 1, and the clamping hole has a supporting effect on the core rod 1 through clamping and positioning. The aperture of the avoiding hole 4012 is larger than the diameter of the middle section of the core rod 1, and the avoiding hole is used for avoiding the axial displacement of the core rod 1. In this embodiment, the avoiding hole 4012 is a taper hole, and the front aperture of the taper hole is smaller than the rear aperture.

As shown in fig. 2 and fig. 3, the radial locking mechanism 2 is driven by a hydraulic cylinder disposed on the machine tool to cause the locking blocks 201 to generate inward and outward radial displacements, thereby forming two states of contraction and expansion of the first taper hole 202; fig. 2 is an axial sectional view of the first taper hole in an open state, in the open state of the first taper hole 202, a gap is formed between two adjacent locking blocks 201, and the gap decreases with the contraction of the first taper hole 202; the radial locking mechanism 2 is in clearance fit with the first conical surface 101 of the core rod 1.

FIG. 3 is an axial cross-sectional view of the first counterbore in the collapsed condition; under the contraction state of the first taper hole 202, the inner side surface of the first taper hole 202 is attached to and extrudes the first conical surface 101 of the first frustum, and further the core rod 1 is driven to move forwards; the second tapered surface 102 of the second tapered platform is attached to and extrudes the inner side surface of the second tapered hole 302 in the expansion sleeve 3, and then the forward displacement of the mandrel 1 drives each expansion block 301 to perform outward radial displacement, so that the expansion sleeve 3 and the stator 9 achieve radial interference fit, the stator 9 is positioned in the axial direction, and the stability of the stator 9 during the processing of the spigot 9011 is further ensured.

As shown in fig. 18, the tooling fixture further includes a tailstock 5, and a fixed convex end 501 is arranged at an upper end of the tailstock 5 in the axial direction; for the fixed convex end 501, a fixed groove 103 is formed on the rear end surface of the mandrel 1; referring to fig. 3, in the contracted state of the first taper hole 202, the tailstock 5 is positioned on the machine tool, and the fixed convex end 501 is in snap fit with the fixed groove 103. The tailstock 5 is used for supporting the core rod 1, so that the core rod 1 and the through hole 401 are coaxially arranged.

As shown in fig. 20 and 21, the tooling fixture further includes a first shield 7 for preventing metal chips from contaminating the stator. The first protection cover 7 comprises a protection plate 701 and a side ring 702 fixedly connected with the periphery of the protection plate 701 correspondingly; a tailstock trepanning 7011 is formed in the protection plate 701, and the first protection cover 7 is sleeved and positioned on the tailstock 5 through the tailstock trepanning 7011; as shown in fig. 3, in an assembled state, the protection plate 701 and the tailstock 5 cover the rear end surface of the stator 9 together, and the side ring 702 is attached to the inner wall of the rear end of the stator casing 901.

As shown in fig. 22 and 23, the tooling fixture further includes a second protective cover 8, the second protective cover 8 is used for assisting in axially positioning and preventing metal chips from polluting the stator, and includes a circumferential ring 801 and a radial ring 802, and an outer edge of the radial ring 802 is fixedly connected with one end of the circumferential ring 801 in the axial direction; as shown in fig. 1 and 2, in an assembled state, the second protective cover 8 is sleeved on the mandrel 1, the radial ring 802 is attached between the stator 9 and the fixed seat 4, and the circumferential ring 801 is attached to an inner wall of a front end of the stator 9.

As shown in fig. 19, the tooling clamp further includes two movably disposed positioning blocks 6. In an assembled state, before the first taper hole 202 is in a contracted state, as shown in fig. 2, the front end surface of the positioning block 6 is attached to the fixing seat 4, and the rear end surface of the positioning block 6 is attached to the front end surface of the stator 9; as shown in fig. 3, after the first taper hole 202 is in the contracted state, the positioning block 6 is removed before the spigot processing is performed. The positioning block 6 is placed to limit the axial position of the stator 9, so that the processing precision and consistency of the spigot 9011 are improved; the positioning block 6 is removed to facilitate the processing of the seam allowance 9011. In this embodiment, the positioning block 6 is made of a magnetic material.

It should be noted that, the axial positioning of the stator can also be realized by directly pushing the core rod to generate the axial displacement by adopting a driving mechanism such as a hydraulic jack, but the effect is far less than that of the invention. In the invention, the first taper hole of the radial locking mechanism is radially contracted to pull the core rod to axially displace. Firstly, the stress modes are different, the structure has higher displacement precision and higher coaxiality. And secondly, because the taper of the first frustum is larger than that of the second frustum, namely, the invention adopts a labor-saving structure, thereby reducing the requirement on power and being beneficial to energy conservation and consumption reduction.

As shown in fig. 2 and 3, during the transition of the first taper hole from the expanded state to the contracted state, the radial displacement of the expansion block is H₂-H₁The radial displacement is correlated with the axial displacement of the core rod. It should be noted that, in the embodiment, the axial displacement of the core rod 1 is only in the order of 0.1 mm, and the radial displacement and the axial displacement are shown in fig. 2 and 3 in an enlarged scale for clearly illustrating the problem and are only schematic.

Other embodiments and structural variations of the present invention are described below:

1. in the above embodiment, the radial lock mechanism uses the hydraulic cylinder as the driving mechanism, but the driving mechanism configured for the radial lock mechanism in the present invention is not limited thereto, and the driving mechanism may also be a driving mechanism such as a cylinder, which is easily understood and accepted by those skilled in the art.

2. In the above embodiment, the mandrel is in the shape of a rotating body, and includes two frustums and a cylinder. However, other suitable shapes can also basically realize the linkage function, such as a frustum with a truncated pyramid or an elliptic cross section, and a cylinder with a polygonal or elliptic cross section instead of a cylinder, but in such an alternative case, due to poor matching degree between the sleeve pieces, poor coaxiality and large abrasion in the matching process, the coaxiality of the spigot processing can be directly influenced, and the remarkable effect of the invention cannot be achieved. As would be readily understood and accepted by those skilled in the art.

3. In the above embodiments, the number of the magnetic material positioning blocks having the T-shaped positioning block is two, but the present invention is not limited thereto. The shape, known materials and the number of positioning blocks that can perform the function of axial positioning of the stator, which are well understood and accepted by the skilled person, are all within the scope of protection of the present invention.

4. In the above embodiment, the number of the expansion blocks in the expansion sleeve is twelve, but the present invention is not limited thereto. The related art solution as long as the condition that the number of the expansion blocks is at least three should be satisfied, which is easily understood and accepted by those skilled in the art, should fall within the scope of the present invention.

5. In the above embodiment, the number of the locking blocks in the radial locking mechanism is six, but the present invention is not limited thereto. The related art solution in which the number of the locking blocks is at least three should fall within the scope of the present invention, which is easily understood and accepted by those skilled in the art.

6. In the above embodiment, the expansion blocks are independent from each other, and the adjacent expansion blocks are connected by using the adhesive in the gap between the adjacent expansion blocks to form the expansion sleeve. The invention is not so limited. As shown in fig. 16 and 17, the present invention may also employ an expansion sleeve having a folded-back structure in which a front end of each expansion block is fixedly connected to a front end of an expansion block adjacent to one side of the expansion block in the circumferential direction, a rear end is fixedly connected to a rear end of an expansion block adjacent to the other side of the expansion block in the circumferential direction, and adjacent expansion blocks 301 are connected at a gap therebetween using an adhesive. As would be readily understood and accepted by those skilled in the art.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A special tool clamp for turning a spigot of a motor stator shell is disclosed, wherein a stator (9) comprises the stator shell (901), a stator core (902) and a stator winding; the method is characterized in that: the tool clamp comprises a core rod (1), a radial locking mechanism (2), an expansion sleeve (3) and a fixed seat (4), wherein the radial locking mechanism (2) and the fixed seat (4) are connected with a machine tool in a positioning mode and are arranged corresponding to the front end of the core rod (1);

the front end of the core rod (1) along the axis is provided with a first frustum, the rear end of the core rod is provided with a second frustum, the two frustums are coaxially arranged, and the lower bottom surfaces of the two frustums are back to back; the taper of the first frustum is larger than that of the second frustum; the peripheral side surface of the first frustum is a first conical surface (101), and the peripheral side surface of the second frustum is a second conical surface (102);

the radial locking mechanism (2) is sleeved on the periphery of a first frustum in the core rod (1), and the radial locking mechanism (2) is composed of at least three locking blocks (201); the locking blocks (201) are uniformly arranged along the circumferential direction of the mandrel axis, so that a first taper hole (202) is defined at the center of the radial locking mechanism (2); the first taper hole (202) is matched with the first taper surface (101) of the first frustum in an alignment mode;

the expansion sleeve (3) is sleeved on the periphery of a second conical table in the mandrel (1); the expansion sleeve (3) consists of at least three expansion blocks (301); the expansion blocks (301) are uniformly arranged at equal angles along the circumferential direction of the mandrel axis, so that a second taper hole (302) is defined and formed in the center of the expansion sleeve (3), and the second taper hole (302) is in contraposition fit with a second taper surface (102) of the second taper platform;

the radial locking mechanism (2) is driven by a driving mechanism to enable each locking block (201) to generate inward and outward radial displacement so as to form two states of contraction and expansion of the first taper hole (202); under the contraction state of the first taper hole (202), the inner side surface of the first taper hole (202) is attached to and extrudes the first conical surface (101) of the first frustum, and further the core rod (1) is driven to move forwards; the second conical surface (102) of the second conical table is attached to and extrudes the inner side surface of a second conical hole (302) in the expansion sleeve (3), and then each expansion block (301) is driven to perform outward radial displacement through forward displacement of the mandrel (1), so that the expansion sleeve (3) and the stator (9) are in radial interference fit, and the stator (9) is positioned in the axial direction.

2. The tooling clamp of claim 1, wherein: the mandrel (1) further comprises a middle section, and the middle section is positioned between the first frustum and the second frustum; a through hole (401) is formed in the fixed seat (4), the middle section of the core rod (1) penetrates through the through hole (401), and the rear end face of the fixed seat (4) is attached to the front end face of the expansion sleeve (3); the through hole (401) consists of a clamping hole (4011) positioned at the front section and an avoiding hole (4012) positioned at the rear section, and the clamping hole and the avoiding hole are communicated in the axial direction; wherein, the aperture of centre gripping hole (4011) with the middle section diameter of plug (1) corresponds, dodge hole (4012) aperture and be greater than the middle section diameter of plug (1).

3. The tooling clamp of claim 2, wherein: the middle section of the core rod (1) is a cylinder.

4. The tooling clamp of claim 1, wherein: the automobile tail seat further comprises a tail seat (5), wherein a fixed convex end (501) is arranged at one axial end of the tail seat (5); aiming at the fixed convex end (501), a fixed groove (103) is formed in the rear end face of the mandrel (1); under the state that the first taper hole (202) contracts, the tailstock (5) is positioned on the machine tool, and the fixed convex end (501) is in clamping fit with the fixed groove (103).

5. The tooling clamp of claim 4, wherein: the protective device also comprises a first protective cover (7), wherein the first protective cover (7) comprises a protective plate (701) and a side ring (702) which is fixedly connected with the periphery of the protective plate (701) correspondingly; a tailstock trepanning (7011) is formed in the protection plate (701), and the first protection cover (7) is sleeved and positioned on the tailstock (5) through the tailstock trepanning (7011); in an assembled state, the protection plate (701) and the tailstock (5) cover the rear end face of the stator (9) together, and the side ring (702) is attached to the inner wall of the rear end of the stator casing (901).

6. The tooling clamp of claim 1, wherein: the device also comprises a second protective cover (8), wherein the second protective cover (8) comprises a circumferential ring (801) and a radial ring (802), and the outer edge of the radial ring (802) is fixedly connected with one end of the circumferential ring (801) along the axial direction; in an assembly state, the second protective cover (8) is sleeved on the mandrel (1), the radial ring (802) is attached between the stator (9) and the fixed seat (4), and the circumferential ring (801) is attached to the inner wall of the front end of the stator (9).

7. The tooling clamp of claim 1, wherein: the front end of each expansion block (301) is fixedly connected with the front end of the expansion block (301) adjacent to one side of the expansion block (301) along the circumferential direction, the rear end of each expansion block is fixedly connected with the rear end of the expansion block (301) adjacent to the other side of the expansion block (301) along the circumferential direction, and the formed expansion sleeve (3) is of a turn-back structure (303).

8. The tooling clamp of claim 1 or 7, wherein: the adjacent expansion blocks (301) are connected by glue at the gap between the adjacent expansion blocks.

9. The tooling clamp of claim 1, wherein: also comprises a movably arranged positioning block (6); in an assembly state, before the radial locking mechanism (2) is in a contraction state, the front end face of the positioning block (6) is attached to the fixed seat (4), and the rear end face of the positioning block (6) is attached to the front end face of the stator (9); and when the radial locking mechanism (2) is in a contraction state, the positioning block (6) is removed.

10. The tooling clamp of claim 2, wherein: the avoiding hole (4012) is a taper hole, and the aperture of the front end of the taper hole is smaller than that of the rear end.