Multi-turn winding expansion mandrel tool and using method thereof

Abstract

The invention discloses a multi-turn winding expansion mandrel tool and a using method thereof, and relates to the technical field of precision machining.The multi-turn winding expansion mandrel tool comprises a tailstock assembly, a mandrel assembly, an open spring jacket and a winding limiting sleeve assembly; the mandrel assembly comprises a mandrel pull rod, a spring and a locking screw, and the spring is arranged on the mandrel pull rod in a sleeving mode; the open spring jacket comprises a first flange section and a square barrel, and the end, away from the square barrel, of the first flange section is suitable for being connected to the end face of the tailstock assembly. The winding limiting sleeve assembly is connected to the periphery of the square barrel in a sleeving mode. One end of the mandrel pull rod is suitable for being inserted into the tailstock assembly, the other end of the mandrel pull rod is suitable for being inserted into the open spring clamping sleeve, and the mandrel pull rod is suitable for conducting radial adjustment on the square barrel so as to fix the winding limiting sleeve assembly. According to the tool, the axial position of the standby winding limiting sleeve can be rapidly adjusted, meanwhile, the requirement for fine positioning of the winding limiting sleeve in the radial direction is met, and the winding quality is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of coil manufacturing equipment, and in particular to a multi-turn winding expansion mandrel tooling and a use method thereof. Background Art

[0002] At present, the traditional method of coil winding is to use a winding machine to wind the wire on the mold, and the mold needs to be manually loaded into the winding machine. After the coil is wound, the coil is manually taken out and inserted into the corresponding mold for baking and shaping. The above method requires a lot of manpower, low production efficiency, high production cost, and product quality is affected by manual operation, and the coil qualification rate is low.

[0003] Announcement No. CN202763107U discloses an expansion sleeve mandrel, which has the following defects: the rear end positioning surface of the expansion sleeve mandrel cannot be adaptively adjusted according to the changes in the parts, and has poor versatility; secondly, although the expansion sleeve mandrel adopts a spring device to realize the easy disassembly of the workpiece on the mandrel, the setting of the spring device, on the one hand, increases the difficulty of processing the expansion sleeve mandrel and increases the cost; on the other hand, it causes axial runout of the expansion sleeve mandrel when it is axially pressed and positioned, and the positioning tension force of the expansion sleeve in the radial direction of the shaft end is uneven, which affects the concentric positioning accuracy of the workpiece. Summary of the invention In view of this, in order to solve the defects existing in the above-mentioned technology, the present invention provides a multi-turn winding expansion mandrel tooling and a method of using the same.

[0004] The technical solution of the present invention is as follows: The first object of the present invention is to provide a multi-turn wire-winding expansion mandrel tool, the multi-turn wire-winding expansion mandrel tool comprising: Tailstock assembly; A spindle assembly, one end of which is inserted into the tailstock assembly, the spindle assembly comprising a spindle pull rod, a spring located in the tailstock assembly and a locking screw threadedly connected to the end surface of the spindle pull rod, the spring being sleeved on the spindle pull rod; The open spring collet comprises a first flange section and a square cylinder which are coaxially connected and integrated with each other, wherein one end of the first flange section away from the square cylinder is suitable for being connected to the end surface of the tailstock assembly, so as to form an accommodating space for accommodating the sliding of the spindle assembly inside the tailstock assembly and the open spring collet; A winding limit sleeve assembly is sleeved on the outer circumference of the square cylinder; One end of the mandrel pull rod is suitable for being inserted into the tailstock assembly, and the other end is suitable for being inserted into the open spring jacket. When the locking screw is spirally screwed in and out, the mandrel pull rod is suitable for radially adjusting the tension of the square cylinder to fix the winding limit sleeve assembly.

[0005] Optionally, the tailstock assembly includes a coaxially connected spring tailstock and a limit stop, the spring tailstock includes a coaxially integrally connected tailstock body and a tailstock flange, the tailstock flange is connected to the first flange section, and the limit stop is connected to one end of the tailstock body away from the tailstock flange.

[0006] Optionally, the mandrel pull rod comprises a first straight section, a second straight section, a third straight section and a first tapered section which are coaxially connected in sequence; The tailstock flange and the inner center of the tailstock body are provided with a first guide hole, a second guide hole and a third guide hole which are coaxially connected in sequence, and the diameter of the second guide hole is larger than the diameters of the first guide hole and the third guide hole; The first straight section is suitable for being inserted into the third guide hole through the first guide hole and the second guide hole, the second straight section is suitable for sliding in the first guide hole, one end of the spring abuts against the inner wall of the second guide hole, and the other end abuts against the second straight section.

[0007] Optionally, a first circular hole is opened at the inner center of the first flange segment, a second conical hole concentric with the first circular hole is opened at the inner center of the square cylinder, the first conical segment is suitable for being inserted into the second conical hole through the first circular hole, and the third straight segment is located in the first guide hole and the first circular hole.

[0008] Optionally, the open spring jacket further comprises a first outer stop coaxially and integrally connected to an end of the first flange section away from the square cylinder, wherein the first outer stop is suitable for being inserted into the first guide hole.

[0009] Optionally, a circular hole close to the first flange section and a first through groove extending along the central axis of the open spring jacket are provided at the center of each end face of the square cylinder, one end of the first through groove extends to communicate with the circular hole on the end face, and the other end extends to the end of the square cylinder.

[0010] Optionally, the winding limit sleeve assembly includes a plurality of winding limit sleeves and ring spacer sleeves which are inserted on the outer periphery of the square cylinder, the plurality of winding limit sleeves are arranged at intervals from each other, and the ring spacer sleeves are located on both sides of the plurality of winding limit sleeves.

[0011] Optionally, the winding limiting sleeve comprises: A disc body, wherein a first inclined wedge groove of a certain depth is formed on the outer circumference of the disc body; Bosses are coaxially and integrally connected to the two side surfaces of the disc body; A square hole is formed at the center of the disc body and the boss, and the square hole is matched with the outer contour of the square cylinder so that the square cylinder is suitable for being inserted into the square hole.

[0012] Optionally, the winding limit sleeve assembly further includes a wire end pressing component mounted on the end surface of the boss, the wire end pressing component is located on one side of the winding limit sleeve and the ring spacer, and the wire end pressing component includes: A cam core shaft is vertically connected to one end surface of the winding limit sleeve in a direction parallel to the central axis of the winding limit sleeve; A cam, sleeved on the cam core shaft; A torsion spring is sleeved on the cam core shaft and is located between the cam and the winding limit sleeve. A receiving groove suitable for accommodating the torsion spring is provided on the side of the cam facing the winding limit sleeve, and one end of the torsion spring is limited on the end surface of the winding limit sleeve, and the other end is limited on the side wall of the receiving groove; A shaft retaining ring is fixedly clamped on a side of the cam core shaft away from the torsion spring, and the shaft retaining ring limits the cam to be tightly attached to the torsion spring; The cam is suitable for rotating and pressing against the outer circumferential surface of the ring spacer to press the end of the winding wire against the contact surface between the ring spacer and the cam.

[0013] The second object of the present invention is to provide a method for using the multi-turn wire-winding expansion mandrel tooling described above, the method comprising the steps of: A winding limit sleeve assembly and a core shaft assembly are respectively installed on the inner and outer sides of the open spring jacket; By pressurizing the mandrel assembly, the locking screw drives the mandrel pull rod to move, thereby adjusting the tension of the square cylinder on the open spring jacket in the radial direction, so that the expansion of the square cylinder reaches 60% to 80% of the pre-expansion amount; After the square cylinder is adjusted to the pre-expansion amount, the radial runout of the square cylinder at the cross section of the winding limit sleeve relative to the center of the mandrel pull rod is measured; After tightening the locking screw, the expansion amount of the square cylinder reaches the pre-expansion amount. The pre-expansion amount of the square cylinder should be able to cause a slight interference of 1 to 3 μm on one side after the winding limit sleeve is installed.

[0014] Compared with the prior art, the present invention has at least the following beneficial effects: 1. The multi-turn winding expansion mandrel tooling of the present invention is composed of a tailstock assembly, a mandrel assembly, an open spring jacket and a winding limit sleeve assembly, wherein the tailstock assembly is used to support and fix one side of the mandrel assembly, one end of the mandrel assembly is inserted into the tailstock assembly, and the mandrel assembly is composed of a mandrel pull rod, a spring and a locking screw. The mandrel pull rod serves as the central guide structure of the entire structure, and its support is connected to the tailstock assembly and the open spring jacket. The spring is located in the tailstock assembly, and the locking screw is threadedly connected to the end face of the mandrel pull rod. The spring sleeve is arranged on the mandrel pull rod, and the spring provides elastic force so that the mandrel pull rod can Slide in the spring tail stock; the open spring jacket is composed of a first flange section and a square cylinder which are coaxially connected as a whole, and the end of the first flange section away from the square cylinder is suitable for connecting to the end face of the tail stock assembly to form an accommodating space for accommodating the sliding of the core shaft assembly inside the tail stock assembly and the open spring jacket; the winding limit sleeve assembly is sleeved on the outer periphery of the square cylinder; one end of the core shaft pull rod is suitable for inserting into the tail stock assembly, and the other end is suitable for inserting into the open spring jacket, and when the locking screw is spirally screwed in and out, the core shaft pull rod radially adjusts the tension of the square cylinder to fix the winding limit sleeve assembly. When it is necessary to tighten the winding limit sleeve assembly, the core shaft assembly pushes the core shaft pull rod to slide to one side of the open spring sleeve, which in turn pushes the core shaft pull rod to tighten the open spring sleeve in the radial direction, thereby fixing the winding limit sleeve assembly; when it is necessary to release the winding limit sleeve assembly, the locking screw can be released to retract the core shaft pull rod, and the open spring sleeve is loosened to release the winding limit sleeve assembly.

[0015] 2. Through the coordinated movement of the tailstock assembly, the mandrel assembly and the open spring collet, a stable supporting force can be provided to ensure the stability of the mandrel assembly during operation; the mandrel assembly can be tightened in the radial direction, allowing the mandrel assembly to adapt to winding limit sleeves of different diameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of a multi-turn wire-winding expansion mandrel tooling in one direction according to an embodiment of the present invention; Figure 2 It is a schematic diagram of the structure of the multi-turn winding expansion mandrel tooling in another direction according to an embodiment of the present invention; Figure 3 It is a schematic diagram of the main structure of the multi-turn winding expansion mandrel tooling in an embodiment of the present invention; Figure 4 It is a schematic cross-sectional structural diagram of a multi-turn winding expansion mandrel tooling in an embodiment of the present invention; Figure 5 Schematic diagram of the three-dimensional structure of the spring tailstock in an embodiment of the present invention; Figure 6 It is a schematic cross-sectional structural diagram of a spring tailstock in an embodiment of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the mandrel pull rod in an embodiment of the present invention; Figure 8 A schematic diagram of the structure of an open spring jacket in one direction in an embodiment of the present invention; Fig. 9 It is a schematic diagram of the structure of the open spring jacket in another direction in an embodiment of the present invention; Fig.10 It is a schematic diagram of the structure of the winding limit sleeve in an embodiment of the present invention; Fig.11 Schematic diagram of the installation structure of the thread end pressing component in an embodiment of the present invention.

[0017] Description of reference numerals: 1- Tailstock assembly; 11-spring tailstock; 111-tailstock body; 112-tailstock flange; 113-first guide hole; 114-second guide hole; 115-third guide hole; 12-limit stopper; 13-connecting piece; 2- spindle assembly; 21- mandrel pull rod; 211- first straight section; 2111- first end face screw hole; 212- second straight section; 213- third straight section; 214- first tapered section; 22-spring; 23-locking screw; 3-Open spring jacket; 31-first flange section; 311-first circular hole; 312-gap groove; 313-connecting hole; 32-square cylinder; 321-second tapered hole; 322-end face circular hole; 323-first through groove; 33- first outer stop; 4-winding limit sleeve assembly; 41-winding limit sleeve; 411-disc body; 4111-first inclined wedge groove; 412- boss; 42-ring spacer; 43-thread clamping component; 431-cam core shaft; 432-cam; 433-torsion spring; 434-shaft retaining ring. DETAILED DESCRIPTION

[0018] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] In the description of the present invention, it should be noted that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0020] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] Figure 1-11 The figure shows a multi-turn wire winding expansion mandrel tooling provided by an embodiment of the present invention, the multi-turn wire winding expansion mandrel tooling comprises a tailstock assembly 1, a mandrel assembly 2, an open spring collet 3 and a winding limit sleeve assembly 4, wherein: The tailstock assembly 1 is used to support and fix one side of the spindle assembly 2; one end of the spindle assembly 2 is inserted into the tailstock assembly 1, and the spindle assembly 2 includes a spindle pull rod 21, a spring 22 and a locking screw 23. The spindle pull rod 21 serves as the central guide structure of the entire structure, and its support is connected to the tailstock assembly 1 and the open spring jacket 3. The spring 22 is located in the tailstock assembly 1, and the locking screw 23 is threadedly connected to the end face of the spindle pull rod 21. The spring 22 is sleeved on the spindle pull rod 21, and the spring 22 provides elastic force so that the spindle pull rod 21 can slide in the tailstock assembly 1; the open spring jacket 3 includes a coaxial integrated The first flange section 31 and the square cylinder 32 are connected, and one end of the first flange section 31 away from the square cylinder 32 is suitable for being connected to the end face of the tailstock assembly 1, so as to form an accommodating space for accommodating the sliding of the core shaft assembly 2 inside the tailstock assembly 1 and the open spring jacket 3; the winding limit sleeve assembly 4 is sleeved on the outer periphery of the square cylinder 32; one end of the core shaft pull rod 21 is suitable for being inserted into the tailstock assembly 1, and the other end is suitable for being inserted into the open spring jacket 3. When the locking screw 23 is spirally screwed in and out, the core shaft pull rod 21 is suitable for radially adjusting the tension of the square cylinder 32 to fix the winding limit sleeve assembly 4.

[0022] When it is necessary to tighten the winding limit sleeve assembly 4, the core shaft assembly 2 pushes the core shaft pull rod 21 to slide to one side of the open spring sleeve 3, which will push the core shaft pull rod 21 to tighten the open spring sleeve 3 in the radial direction, thereby fixing the winding limit sleeve assembly 4; when it is necessary to release the winding limit sleeve assembly 4, the locking screw 23 can be released to make the core shaft pull rod 21 retract, and the open spring sleeve 3 is loosened accordingly, thereby releasing the winding limit sleeve assembly 4.

[0023] Therefore, through the coordinated movement of the tailstock assembly 1, the core shaft assembly 2 and the open spring sleeve 3, a stable supporting force can be provided to ensure the stability of the core shaft assembly 2 during operation; the core shaft assembly 2 can be tightened in the radial direction, allowing the core shaft assembly 2 to adapt to winding limit sleeves of different diameters.

[0024] For further information, see Figure 4 , 5 6, in order to improve the processing accuracy, ensure the concentricity of the tailstock assembly when it moves in the axial direction, and reduce the processing deviation caused by the installation error, the tailstock assembly 1 in this embodiment includes a coaxially connected spring tailstock 11 and a limit stopper 12, and the spring tailstock 11 and the limit stopper 12 are fixedly connected by a connecting member 13. The spring tailstock 11 includes a coaxially integrally connected tailstock body 111 and a tailstock flange 112, the tailstock flange 112 is connected to the first flange section 31, and the limit stopper 12 is connected to the end of the tailstock body 111 away from the tailstock flange 112. In this way, it is ensured that the tailstock assembly 1 maintains accurate concentricity when it moves in the axial direction.

[0025] For further information, see Figure 4 , 7 As shown, the mandrel pull rod 21 includes a first straight section 211, a second straight section 212, a third straight section 213 and a first tapered section 214 which are coaxially connected in sequence, so that the mandrel pull rod 21 has different functions and strength requirements in different areas while maintaining overall coaxiality to maintain rotational symmetry and reduce processing errors.

[0026] To facilitate accurate positioning and motion control of the mandrel pull rod 21, as Figure 6 As shown, the tailstock flange 112 and the inner center of the tailstock body 111 in this embodiment are provided with a first guide hole 113, a second guide hole 114 and a third guide hole 115 which are coaxially connected in sequence, and the diameter of the second guide hole 114 is larger than the diameters of the first guide hole 113 and the third guide hole 115.

[0027] A first end face screw hole 2111 is provided at the center of the end face of the first straight section 211 away from the second straight section 212. The locking screw 23 is connected through the internal thread of the first end face screw hole 2111, and the horizontal movement of the mandrel pull rod 21 is driven by the locking screw 23. The first straight section 211 is suitable for being inserted into the third guide hole 115 through the first guide hole 113 and the second guide hole 114, and the second straight section 212 is suitable for sliding in the first guide hole 113. One end of the spring 22 abuts against the inner wall of the second guide hole 114, and the other end abuts against the second straight section 212. In this way, the elastic force of the spring 22 is used to provide the sliding power of the second straight section 212 in the first guide hole 113, and is also used to maintain the pre-tightening force of the mandrel pull rod 21 to reduce vibration and improve positioning accuracy.

[0028] For further information, see Figure 4 As shown, the mandrel pull rod 21 includes a first straight section 211, a second straight section 212, a third straight section 213 and a first tapered section 214 which are coaxially connected in sequence, so that the mandrel pull rod 21 has different functions and strength requirements in different areas while maintaining overall coaxiality to maintain rotational symmetry and reduce processing errors.

[0029] In order to facilitate the precise positioning and motion control of the mandrel pull rod 21, the tailstock flange 112 in this embodiment and the inner center of the tailstock body 111 are sequentially provided with a first guide hole 113, a second guide hole 114 and a third guide hole 115 which are coaxially connected in sequence, and the diameter of the second guide hole 114 is larger than the diameters of the first guide hole 113 and the third guide hole 115; The first straight section 211 is suitable for being inserted into the third guide hole 115 through the first guide hole 113 and the second guide hole 114, and the second straight section 212 is suitable for sliding in the first guide hole 113. One end of the spring 22 abuts against the inner wall of the second guide hole 114, and the other end abuts against the second straight section 212. In this way, the elastic force of the spring 22 is used to provide the sliding power of the second straight section 212 in the first guide hole 113, and is also used to maintain the pre-tightening force of the mandrel pull rod 21, so as to reduce vibration and improve positioning accuracy.

[0030] For further information, see Figure 8 , 9 As shown, a first circular hole 311 is opened at the inner center of the first flange section 31, a second conical hole 321 concentric with the first circular hole 311 is opened at the inner center of the square cylinder 32, the first conical section 214 is suitable for being inserted into the second conical hole 321 through the first circular hole 311, and the third straight section 213 is located in the first guide hole 113 and the first circular hole 311.

[0031] Specifically in this embodiment, a first circular hole 311 is provided at the inner center of the first flange section 31, and clearance grooves 312 are evenly arranged around the first flange section 31. A connection hole 313 threadedly connected to the tailstock flange 112 is provided in the clearance groove 312, so that the first straight section 211 of the mandrel pull rod 21 is connected to the tailstock assembly 1 through the first circular hole 311. A second tapered hole 321 concentric with the first circular hole 311 is provided at the inner center of the square cylinder 32, so that the first straight section 211 can be smoothly inserted from the first circular hole 311 into the second tapered hole 321 while maintaining the symmetry and stability of the overall structure, which helps to provide progressive fastening and positioning and enhance the stability of the connection.

[0032] In addition, the combination of the tapered section and the tapered hole can provide a self-locking function to prevent axial displacement when subjected to force, while also facilitating installation and removal because the tapered structure can self-guide during insertion, reducing the difficulty of alignment.

[0033] For further information, see Figure 6 , 9 As shown, the open spring collet 3 also includes a first outer stop 33 coaxially connected to the end of the first flange section 31 away from the square cylinder 32, and the first outer stop 33 is suitable for being inserted into the first guide hole 113. This limit setting can not only prevent or reduce the offset or step difference when the two mutually matched shells are assembled; the first outer stop 33 can also make the gap between the open spring collet 3 and the tailstock body 111 more uniform, and the appearance is more high-end and better quality.

[0034] For further information, see Fig. 9 As shown, a circular hole 322 close to the first flange section 31 and a first through groove 323 extending along the central axis of the open spring jacket 3 are provided at the center of each end face of the square cylinder 32. One end of the first through groove 323 extends to communicate with the circular hole 322, and the other end extends to the end of the square cylinder 32.

[0035] Specifically in this embodiment, the square cylinder 32 allows the mandrel pull rod 21 to move precisely therein, thereby realizing precise tightening and loosening operations on the open spring jacket 3. The circumference of the square cylinder 32 is evenly distributed with a number of open grooves, and when the locking outer cone presses the inner cone, the expansion sleeve is deformed, and the winding limit sleeve 41 is tightened by increasing the diameter of the internal expansion sleeve of the square cylinder 32.

[0036] In actual operation, by rotating the locking screw 23, the mandrel rod 21 can be driven to move along the thread, thereby adjusting the position of the mandrel rod 21, and the mandrel rod 21 moves inside the square cylinder 32 through the second tapered hole 321 to achieve the tightening or loosening of the open spring jacket 3. The end face circular hole 322 provides a fixed connection point, and the first through groove 323 provides a sliding path, so that the mandrel rod 21 can move smoothly to achieve precise tightening and loosening operations.

[0037] For further information, see Figure 4 As shown, the winding limit sleeve assembly 4 includes a plurality of winding limit sleeves 41 and a winding ring spacer sleeve 42 which are inserted on the outer circumference of the square cylinder 32 . The plurality of winding limit sleeves 41 are arranged at intervals from each other, and the winding ring spacer sleeves 42 are located on both sides of the plurality of winding limit sleeves 41 .

[0038] In this embodiment, by arranging multiple winding limit sleeves 41 on the square cylinder 32, the winding process can be effectively controlled and limited, so as to produce a coil with the required structural shape; it can also ensure that the wire is evenly wound to avoid the wire piling up in one place, which affects the working efficiency of the winding machine and the quality of the coil.

[0039] like Fig.10 As shown, the winding limit sleeve 41 includes a disc body 411 and a boss 412, wherein a first inclined wedge groove 4111 of a certain depth is opened on the outer circumference of the disc body 411; the boss 412 is coaxially and integrally connected to the two side surfaces of the disc body 411; a square hole is opened in the center of the disc body 411 and the boss 412, and the square hole is adapted to the outer contour shape of the square cylinder 32, so that the square cylinder 32 is suitable for inserting into the square hole.

[0040] For further information, see Fig. 9 , 11 As shown, the winding limit sleeve assembly 4 also includes a wire end pressing component 43 installed on the end surface of the boss 412, and the wire end pressing component 43 is located on one side of the winding limit sleeve 41 and the ring spacer sleeve 42, wherein: The thread end pressing component 43 includes a cam core shaft 431, a cam 432, a torsion spring 433 and a shaft retaining ring 434, wherein the cam core shaft 431 is vertically connected to one end face of the winding limit sleeve 41 along a direction parallel to the central axis of the winding limit sleeve 41; the cam 432 is sleeved on the cam core shaft 431; the torsion spring 433 is sleeved on the cam core shaft 431 and is located between the cam 432 and the winding limit sleeve 41, and the cam 432 has a side facing the winding limit sleeve 41. An accommodating groove for accommodating a torsion spring 433, with one end of the torsion spring 433 limited on the end face of the winding limit sleeve 41, and the other end limited on the side wall of the accommodating groove; a shaft retaining ring 434 is fixedly clamped on the side of the cam core shaft 431 away from the torsion spring 433, and the shaft retaining ring 434 limits the cam 432 to be tightly attached to the torsion spring 433; the cam 432 is suitable for rotating and pressing on the outer circumferential surface of the ring spacer sleeve 42 to press the end of the winding on the contact surface between the ring spacer sleeve 42 and the cam 432.

[0041] The wire end clamping component 43 is installed on one side of the winding limit sleeve 41 and the ring spacer sleeve 42, and the winding limit sleeve 41 and the ring spacer sleeve 42 are parallel and arranged on the open spring jacket 3, wherein the cam core shaft 431 serves as the basis of the wire end clamping component 43, and the cam core shaft 431 is vertically connected to one side end face of the winding limit sleeve 41 along a direction parallel to the central axis of the winding limit sleeve 41; the cam 432 is sleeved on the cam core shaft 431, and is used to rotate to press the head or tail of one end of the winding against the ring spacer sleeve 42; the torsion spring 433 is sleeved on the cam core shaft 431 and is located between the cam 432 and the winding limit sleeve 41, and the cam 432 is provided with a receiving groove suitable for accommodating the torsion spring 433 on the side facing the winding limit sleeve 41, and one end of the torsion spring 433 is limited on the end face of the winding limit sleeve 41, and the other end is limited on the side wall of the receiving groove. In this way, the torsion spring 433 provides elastic force to ensure that the cam 432 and the ring spacer sleeve 42 can be in close contact to achieve the compression of the winding end; the shaft retaining ring 434 is fixedly clamped on the side of the cam core shaft 431 away from the torsion spring 433, and the shaft retaining ring 434 limits the cam 432 to be tightly against the torsion spring 433; the cam 432 is suitable for rotating and pressing on the outer circumferential surface of the ring spacer sleeve 42 to press the end of the winding on the contact surface between the ring spacer sleeve 42 and the cam 432.

[0042] When it is necessary to tighten the end of the winding, the cam 432 rotates under the elastic force of the torsion spring 433 and is pressed against the outer circumferential surface of the winding spacer sleeve 42. One end of the torsion spring 433 is limited on the end surface of the winding limiting sleeve 41, and the other end is limited on the side wall of the accommodating groove of the cam 432, so that the elastic force of the torsion spring 433 can be effectively transmitted to the cam 432; the shaft retaining ring 434 is used to limit the position of the cam 432 to ensure that it will not be displaced due to the elastic force of the torsion spring 433, so as to maintain the contact pressure between the cam 432 and the winding spacer sleeve 42.

[0043] Thus, the cam 432 can be stably pressed on the ring spacer 42 by the elastic force provided by the torsion spring 433 to ensure that the end of the winding is effectively fixed. In addition, since the cam 432 can rotate, the pressing force can be adjusted as needed to adapt to different winding requirements.

[0044] The embodiment of the present invention further provides a method for using a multi-turn wire-winding expansion mandrel tool, the method comprising the steps of: The winding limit sleeve assembly 4 and the core shaft assembly 2 are respectively installed on the inner and outer sides of the open spring jacket 3; By pressurizing the mandrel assembly 2, the locking screw 23 drives the mandrel pull rod 21 to move, thereby adjusting the tension of the square cylinder 32 on the open spring jacket 3 in the radial direction, so that the expansion amount of the square cylinder 32 reaches 60% to 80% of the pre-expansion amount; After the square cylinder 32 is adjusted to the pre-expansion amount, the radial runout of the square cylinder 32 at the cross section of the winding limit sleeve 41 relative to the center of the mandrel pull rod 21 is measured; After tightening the locking screw 23, the expansion amount of the square cylinder 32 reaches the pre-expansion amount. The pre-expansion amount of the square cylinder 32 should be able to make the winding limit sleeve 41 have a slight interference of 1 to 3 μm on one side after installation. Therefore, by using the core shaft assembly 2, the tension and pre-expansion of the open spring sleeve 3 are accurately controlled, and high-precision clamping of the winding limit sleeve 41 is achieved, which not only improves the positioning and processing accuracy of the winding limit sleeve 41, realizes gap-free clamping of the core shaft and the inner hole, but also improves the processing accuracy and efficiency.

[0045] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A multi-turn winding expansion mandrel tooling, characterized in that: include: Tailstock assembly; A spindle assembly, one end of which is inserted into the tailstock assembly, the spindle assembly comprising a spindle pull rod, a spring located in the tailstock assembly and a locking screw threadedly connected to the end surface of the spindle pull rod, the spring being sleeved on the spindle pull rod; The open spring collet comprises a first flange section and a square cylinder which are coaxially connected and integrated with each other, wherein one end of the first flange section away from the square cylinder is suitable for being connected to the end surface of the tailstock assembly, so as to form an accommodating space for accommodating the sliding of the spindle assembly inside the tailstock assembly and the open spring collet; A winding limit sleeve assembly is sleeved on the outer circumference of the square cylinder; One end of the mandrel pull rod is suitable for being inserted into the tailstock assembly, and the other end is suitable for being inserted into the open spring jacket. When the locking screw is spirally screwed in and out, the mandrel pull rod is suitable for radially adjusting the tension of the square cylinder to fix the winding limit sleeve assembly.

2. The multi-turn winding expansion mandrel tooling according to claim 1, characterized in that: The tailstock assembly includes a coaxially connected spring tailstock and a limit stopper, the spring tailstock includes a coaxially integrally connected tailstock body and a tailstock flange, the tailstock flange is connected to the first flange section, and the limit stopper is connected to an end of the tailstock body away from the tailstock flange.

3. The multi-turn wire-winding expansion mandrel tooling according to claim 2, characterized in that: The mandrel pull rod comprises a first straight section, a second straight section, a third straight section and a first tapered section which are coaxially connected in sequence; The tailstock flange and the inner center of the tailstock body are provided with a first guide hole, a second guide hole and a third guide hole which are coaxially connected in sequence, and the diameter of the second guide hole is larger than the diameters of the first guide hole and the third guide hole; The first straight section is suitable for being inserted into the third guide hole through the first guide hole and the second guide hole, the second straight section is suitable for sliding in the first guide hole, one end of the spring abuts against the inner wall of the second guide hole, and the other end abuts against the second straight section.

4. The multi-turn wire-winding expansion mandrel tooling according to claim 3, characterized in that: A first circular hole is opened at the inner center of the first flange section, a second conical hole concentric with the first circular hole is opened at the inner center of the square cylinder, the first conical section is suitable for being inserted into the second conical hole through the first circular hole, and the third straight section is located in the first guide hole and the first circular hole.

5. The multi-turn wire-winding expansion mandrel tooling according to claim 3, characterized in that: The open spring clip also includes a first outer stop coaxially and integrally connected to an end of the first flange section away from the square cylinder, and the first outer stop is suitable for being inserted into the first guide hole.

6. The multi-turn wire-winding expansion mandrel tooling according to claim 1, characterized in that: A circular hole close to the first flange section and a first through slot extending along the central axis of the open spring jacket are provided at the center of each end face of the square cylinder. One end of the first through slot extends to communicate with the circular hole on the end face, and the other end extends to the end of the square cylinder.

7. The multi-turn wire-winding expansion mandrel tooling according to claim 1, characterized in that: The winding limit sleeve assembly comprises a plurality of winding limit sleeves and winding ring spacer sleeves which are inserted on the outer periphery of the square cylinder. The plurality of winding limit sleeves are arranged at intervals from each other, and the winding ring spacer sleeves are located on both sides of the plurality of winding limit sleeves.

8. The multi-turn wire-winding expansion mandrel tooling according to claim 7, characterized in that: The winding limiting sleeve comprises: A disc body, wherein a first inclined wedge groove of a certain depth is formed on the outer circumference of the disc body; Bosses are coaxially and integrally connected to the two side surfaces of the disc body; A square hole is formed at the center of the disc body and the boss, and the square hole is matched with the outer contour of the square cylinder so that the square cylinder is suitable for being inserted into the square hole.

9. The multi-turn wire-winding expansion mandrel tooling according to claim 8, characterized in that: The winding limit sleeve assembly also includes a wire end pressing component installed on the end surface of the boss, the wire end pressing component is located on one side of the winding limit sleeve and the ring spacer, and the wire end pressing component includes: A cam core shaft is vertically connected to one end surface of the winding limit sleeve in a direction parallel to the central axis of the winding limit sleeve; A cam, sleeved on the cam core shaft; A torsion spring is sleeved on the cam core shaft and is located between the cam and the winding limit sleeve. A receiving groove suitable for accommodating the torsion spring is provided on the side of the cam facing the winding limit sleeve, and one end of the torsion spring is limited on the end surface of the winding limit sleeve, and the other end is limited on the side wall of the receiving groove; A shaft retaining ring is fixedly clamped on a side of the cam core shaft away from the torsion spring, and the shaft retaining ring limits the cam to be tightly attached to the torsion spring; The cam is suitable for rotating and pressing against the outer circumferential surface of the ring spacer to press the end of the winding wire against the contact surface between the ring spacer and the cam.

10. A method for using the multi-turn wire-winding expansion mandrel tooling according to any one of claims 1 to 9, characterized in that: The method of use comprises the steps of: A winding limit sleeve assembly and a core shaft assembly are respectively installed on the inner and outer sides of the open spring jacket; By pressurizing the mandrel assembly, the locking screw drives the mandrel pull rod to move, thereby adjusting the tension of the square cylinder on the open spring clip in the radial direction, so that the expansion of the square cylinder reaches 60% to 80% of the pre-expansion amount; After the square cylinder is adjusted to the pre-expansion amount, the radial runout of the square cylinder at the cross section of the winding limit sleeve relative to the center of the mandrel pull rod is measured; After tightening the locking screw, the expansion amount of the square cylinder reaches the pre-expansion amount. The pre-expansion amount of the square cylinder should be able to cause a slight interference of 1 to 3 μm on one side after the winding limit sleeve is installed.

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