A multi-turn winding expansion mandrel tool and method of use thereof

Abstract

The application discloses a multi-coil winding expansion mandrel tool and a using method thereof, and relates to the technical field of precision machining. The multi-coil winding expansion mandrel tool comprises a tail seat assembly, a mandrel assembly, an open spring collet and a winding limiting sleeve assembly. One end of the mandrel assembly is inserted into the tail seat assembly. The mandrel assembly comprises a mandrel pull rod, a spring and a locking screw. The spring is sleeved on the mandrel pull rod. The open spring collet comprises a first flange section and a square cylinder. The end of the first flange section away from the square cylinder is adapted to be connected to the end face of the tail seat assembly. The winding limiting sleeve assembly is sleeved on the outer periphery of the square cylinder. One end of the mandrel pull rod is adapted to be inserted into the tail seat assembly, and the other end is adapted to be inserted into the open spring collet. The mandrel pull rod is adapted to be radially adjusted to the square cylinder to fix the winding limiting sleeve assembly. The tool can quickly adjust the axial position of the winding limiting sleeve, meet the radial fine positioning requirement of the winding limiting sleeve and ensure the winding quality.

Description

Technical Field

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

[0002] Currently, the traditional coil winding method involves using a winding machine to wind the wire onto a mold. The mold then needs to be manually loaded into the winding machine. Once the coil is wound, it is manually removed and inserted into the corresponding mold for baking and shaping. This method requires a lot of labor, resulting in low production efficiency and high production costs. Furthermore, product quality is affected by manual operation, resulting in a low coil qualification rate.

[0003] Announcement No. CN202763107U discloses an expansion sleeve mandrel. The defects of the expansion sleeve mandrel are as follows: the rear end positioning surface of the expansion sleeve mandrel cannot be adaptively adjusted according to the changes of the parts, and the versatility is poor; 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 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

[0004] In view of this, in order to solve the defects of the above-mentioned technology, the present invention provides a multi-turn winding expansion mandrel tooling and a method of using the same.

[0005] The technical solutions of the present invention are as follows:

[0006] A 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:

[0007] Tailstock assembly;

[0008] 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 face of the spindle pull rod, the spring being sleeved on the spindle pull rod;

[0009] An open spring collet comprises a first flange section and a square cylinder coaxially connected and integrally connected, wherein an end of the first flange section away from the square cylinder is adapted to be connected to an end surface of the tailstock assembly to form an accommodating space inside the tailstock assembly and the open spring collet for accommodating the sliding movement of the spindle assembly;

[0010] A winding limit sleeve assembly is sleeved on the outer circumference of the square cylinder;

[0011] One end of the core shaft pull rod is suitable for inserting into the tailstock assembly, and the other end is suitable for inserting into the open spring sleeve. When the locking screw is spirally screwed in and out, the core shaft pull rod is suitable for radially adjusting the tension of the square cylinder to fix the winding limit sleeve assembly.

[0012] Optionally, the tailstock assembly includes a coaxially connected spring tailstock and a limit stop, the spring tailstock includes a coaxially integrated 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.

[0013] Optionally, the core shaft pull rod comprises a first straight section, a second straight section, a third straight section and a first tapered section coaxially connected in sequence;

[0014] A first guide hole, a second guide hole, and a third guide hole are coaxially connected to each other in sequence at the inner center of the tailstock flange and the tailstock body, wherein the diameter of the second guide hole is larger than that of the first guide hole and the third guide hole;

[0015] The first straight section is adapted to be inserted into the third guide hole through the first guide hole and the second guide hole, and the second straight section is adapted to slide 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.

[0016] Optionally, a first circular hole is opened in the inner center of the first flange segment, a second conical hole concentric with the first circular hole is opened in 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.

[0017] 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, and the first outer stop is suitable for being inserted into the first guide hole.

[0018] 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.

[0019] Optionally, the winding limit sleeve assembly includes a plurality of winding limit sleeves and ring spacer sleeves that are passed through 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.

[0020] Optionally, the winding limiting sleeve includes:

[0021] A disc body, wherein a first inclined wedge groove of a certain depth is formed on the outer circumference of the disc body;

[0022] Bosses, coaxially and integrally connected to both side surfaces of the disc body;

[0023] A square hole is formed in the center of the disc body and the boss, and the square hole is adapted to the outer contour of the square cylinder so that the square cylinder is suitable for being inserted into the square hole.

[0024] 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:

[0025] 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;

[0026] A cam, sleeved on the cam core shaft;

[0027] a torsion spring, sleeved on the cam core shaft and located between the cam and the winding limit sleeve; a receiving groove suitable for accommodating the torsion spring is formed on a 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;

[0028] A shaft retaining ring is fixedly connected to the 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;

[0029] The cam is adapted to be rotated and pressed against the outer circumferential surface of the ring spacer so as to press the end of the winding wire against the contact surface between the ring spacer and the cam.

[0030] A second object of the present invention is to provide a method for using the multi-turn winding expansion mandrel tooling described above, the method comprising the steps of:

[0031] The winding limit sleeve assembly and the core shaft assembly are respectively installed on the inner and outer sides of the open spring jacket;

[0032] By pressurizing the core shaft assembly, the locking screw drives the core shaft pull rod to move, thereby adjusting the radial tension of the square cylinder on the open spring jacket so that the expansion of the square cylinder reaches 60% to 80% of the pre-expansion amount;

[0033] After adjusting the square cylinder to the pre-expansion amount, measure the radial runout of the square cylinder relative to the center of the core shaft pull rod at the cross section of the winding limit sleeve;

[0034] 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.

[0035] Compared with the prior art, the present invention has at least the following beneficial effects:

[0036] 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 Sliding in the spring tail stock; the open spring jacket is composed of a first flange section and a square cylinder that 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. When the locking screw is spirally screwed in and out, the core shaft pull rod radially adjusts the tightness of the square cylinder to fix the winding limit sleeve assembly. When the winding limit sleeve assembly needs to be tightened, the core shaft pull rod is pushed to slide toward one side of the open spring sleeve through the core shaft assembly, 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 the winding limit sleeve assembly needs to be released, the locking screw can be released to retract the core shaft pull rod, and the open spring sleeve is relaxed, thereby releasing the winding limit sleeve assembly.

[0037] 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

[0038] Figure 1 This is a schematic structural diagram of one direction of a multi-turn winding expansion mandrel tooling according to an embodiment of the present invention;

[0039] Figure 2 This is a schematic structural diagram of another direction of the multi-turn winding expansion mandrel tooling in an embodiment of the present invention;

[0040] Figure 3It is the main view structural schematic diagram of the multi-coil winding expansion mandrel tool in the embodiment of the application;

[0041] Figure 4 It is the sectional view structural schematic diagram of the multi-coil winding expansion mandrel tool in the embodiment of the application;

[0042] Figure 5 It is the three-dimensional structural schematic diagram of the spring tail seat in the embodiment of the application;

[0043] Figure 6 It is the sectional view structural schematic diagram of the spring tail seat in the embodiment of the application;

[0044] Figure 7 It is the three-dimensional structural schematic diagram of the mandrel pull rod in the embodiment of the application;

[0045] Figure 8 It is the one-direction structural schematic diagram of the open spring collet in the embodiment of the application;

[0046] Figure 9 It is the other-direction structural schematic diagram of the open spring collet in the embodiment of the application;

[0047] Figure 10 It is the structural schematic diagram of the winding limiting sleeve in the embodiment of the application;

[0048] Figure 11 It is the installation structural schematic diagram of the wire end pressing component in the embodiment of the application.

[0049] Explanation of reference signs:

[0050] 1-tail seat assembly;

[0051] 11-spring tail seat; 111-tail seat body; 112-tail seat flange; 113-first guide hole; 114-second guide hole; 115-third guide hole;

[0052] 12-limiting stop block; 13-connection piece;

[0053] 2-mandrel assembly;

[0054] 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;

[0055] 22-spring; 23-locking screw;

[0056] 3-open spring collet;

[0057] 31-first flange section; 311-first circular hole; 312-giving slot; 313-connection hole;

[0058] 32-square cylinder; 321-second tapered hole; 322-end face circular hole; 323-first through groove;

[0059] 33-first outer stop;

[0060] 4-winding limit sleeve assembly;

[0061] 41-winding limit sleeve;

[0062] 411-disc body; 4111-first inclined wedge groove;

[0063] 412- boss;

[0064] 42- ring spacer;

[0065] 43-thread end pressing component; 431-cam core shaft; 432-cam; 433-torsion spring; 434-shaft retaining ring. DETAILED DESCRIPTION

[0066] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0067] 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.

[0068] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components; wireless connections or wired connections. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0069] Figure 1-11 The figure shows a multi-turn winding expansion mandrel tool provided by an embodiment of the present invention, which includes a tailstock assembly 1, a mandrel assembly 2, an open spring collet 3 and a winding limit sleeve assembly 4, wherein:

[0070] The tailstock assembly 1 is used to support and fix one side of the core shaft assembly 2; one end of the core shaft assembly 2 is inserted into the tailstock assembly 1, and the core shaft assembly 2 includes a core shaft pull rod 21, a spring 22 and a locking screw 23. The core shaft 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 sleeve 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 core shaft pull rod 21. The spring 22 is sleeved on the core shaft pull rod 21, and the elastic force provided by the spring 22 allows the core shaft pull rod 21 to slide in the tailstock assembly 1; the open spring sleeve 3 includes a coaxial integrated The first flange section 31 and the square cylinder 32 are connected, and the 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 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 tightness of the square cylinder 32 to fix the winding limit sleeve assembly 4.

[0071] 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, and then pushes 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 retract the core shaft pull rod 21, and the open spring sleeve 3 is relaxed, thereby releasing the winding limit sleeve assembly 4.

[0072] Therefore, through the mutual cooperation 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.

[0073] For further information, see Figure 4 、 5 As shown in Figures 6 and 7, in order to improve machining accuracy, ensure the concentricity of the tailstock assembly during axial movement, and reduce machining deviations caused by installation errors, the tailstock assembly 1 in this embodiment includes a coaxially connected spring tailstock 11 and a limit stop 12, which are fixedly connected via a connector 13. The spring tailstock 11 includes a coaxially integrated tailstock body 111 and a tailstock flange 112, the tailstock flange 112 being connected to the first flange section 31, and the limit stop 12 being connected to the end of the tailstock body 111 away from the tailstock flange 112. This ensures that the tailstock assembly 1 maintains precise concentricity during axial movement.

[0074] For further information, see Figure 4 、 7 As shown, the core shaft 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 that are coaxially connected in sequence, so that the core shaft pull rod 21 has different functions and strength requirements in different areas, while maintaining the overall coaxiality to maintain rotational symmetry and reduce processing errors.

[0075] In order to facilitate the precise positioning and motion control of the mandrel pull rod 21, as shown in FIG. Figure 6 As shown, in this embodiment, the tailstock flange 112 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. 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.

[0076] A first end surface threaded hole 2111 is defined at the center of the end surface of the first straight section 211, away from the second straight section 212. A locking screw 23 is threadedly connected to the first end surface threaded hole 2111, thereby driving the horizontal movement of the mandrel pull rod 21. The first straight section 211 is adapted to be inserted into the third guide hole 115 via the first and second guide holes 113 and 114. The second straight section 212 is adapted to slide within the first guide hole 113. One end of the spring 22 abuts the inner wall of the second guide hole 114, and the other end abuts the second straight section 212. The elastic force of the spring 22 is utilized to provide the sliding force for the second straight section 212 within the first guide hole 113, while also maintaining the preload force on the mandrel pull rod 21, thereby reducing vibration and improving positioning accuracy.

[0077] For further information, see Figure 4 As shown, the core shaft 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 that are coaxially connected in sequence, so that the core shaft pull rod 21 has different functions and strength requirements in different areas, while maintaining the overall coaxiality to maintain rotational symmetry and reduce processing errors.

[0078] To facilitate precise positioning and motion control of the spindle pull rod 21, a first guide hole 113, a second guide hole 114, and a third guide hole 115 are coaxially connected to each other in the center of the tailstock flange 112 and the tailstock body 111 in this embodiment. The diameter of the second guide hole 114 is larger than that of the first guide hole 113 and the third guide hole 115.

[0079] The first straight section 211 is adapted to be inserted into the third guide hole 115 via the first guide hole 113 and the second guide hole 114. The second straight section 212 is adapted to slide within 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. The elastic force of the spring 22 is thus utilized to provide the sliding force for the second straight section 212 within the first guide hole 113, while also maintaining the preload force on the core shaft pull rod 21, thereby reducing vibration and improving positioning accuracy.

[0080] 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, and 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.

[0081] Specifically in this embodiment, a first circular hole 311 is defined in the inner center of the first flange section 31, and relief grooves 312 are evenly distributed around the first flange section 31. The relief grooves 312 define connection holes 313 that are threadedly connected to the tailstock flange 112. Thus, 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 defined in the inner center of the square cylinder 32. This allows the first straight section 211 to 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. This helps provide progressive tightening and positioning, and enhances the stability of the connection.

[0082] 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. It also facilitates installation and disassembly because the tapered structure can self-guide during insertion, reducing the difficulty of alignment.

[0083] For further information, see Figure 6 、 9 As shown, the open spring collet 3 also includes a first outer stop 33 coaxially and integrally connected to the end of the first flange section 31 away from the square cylinder 32. The first outer stop 33 is adapted to be inserted into the first guide hole 113. This position-limiting arrangement not only prevents or reduces misalignment or step differences during assembly of the two mating housings, but also ensures a more uniform gap between the open spring collet 3 and the tailstock body 111, giving the collet a more premium appearance and higher quality.

[0084] For further information, see Figure 9As 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.

[0085] In this embodiment, the square cylinder 32 allows the mandrel pull rod 21 to move precisely within it, enabling precise tightening and loosening of the open spring collet 3. Several open slots are evenly distributed around the circumference of the square cylinder 32. When the outer cone is tightened and presses against the inner cone, the collet deforms, increasing the diameter of the collet within the square cylinder 32 and tightening the winding limit sleeve 41.

[0086] In actual operation, by rotating the locking screw 23, the mandrel rod 21 can be moved along the thread, thereby adjusting the position of the mandrel rod 21. The mandrel rod 21 moves inside the square cylinder 32 through the second tapered hole 321 to tighten or loosen the open spring jacket 3. The end surface circular hole 322 provides a fixed connection point, while the first through-slot 323 provides a sliding path, allowing the mandrel rod 21 to move smoothly and achieve precise tightening and loosening operations.

[0087] 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 42 which are passed through the outer periphery of the square cylinder 32 . The plurality of winding limit sleeves 41 are arranged at intervals from each other, and the winding ring spacer 42 is located on both sides of the plurality of winding limit sleeves 41 .

[0088] 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 wound evenly, avoiding the wire from piling up in one place, affecting the working efficiency of the winding machine and the quality of the coil.

[0089] like Figure 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 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 being inserted into the square hole.

[0090] For further information, see Figure 9 、 11 As shown, the winding limit sleeve assembly 4 further includes a wire end pressing component 43 mounted 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 42, wherein:

[0091] 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 is provided with a side facing the winding limit sleeve 41 suitable for 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 42 to press the end of the winding on the contact surface between the ring spacer 42 and the cam 432.

[0092] The wire end pressing component 43 is installed on one side of the winding limit sleeve 41 and the ring spacer 42. The winding limit sleeve 41 and the ring spacer 42 are parallel and arranged side by side on the open spring jacket 3, wherein the cam core shaft 431 serves as the basis of the wire end pressing component 43, and 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, and is used to rotate to press the head or tail of one end of the winding against the ring spacer 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 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 attached to the torsion spring 433; the cam 432 is suitable for rotating and pressing on the outer circumference of the ring spacer 42 to press the end of the winding on the contact surface between the ring spacer 42 and the cam 432.

[0093] When the end of the winding needs to be tightened, the cam 432 rotates under the elastic force of the torsion spring 433 and is pressed against the outer circumference of the ring spacer 42. One end of the torsion spring 433 is limited on the end face of the winding limiting sleeve 41, and the other end is limited on the side wall of the accommodating groove of the cam 432. In this way, 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 ring spacer 42.

[0094] Thus, the cam 432 can be stably pressed against 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.

[0095] An embodiment of the present invention further provides a method for using a multi-turn winding expansion mandrel tool, the method comprising the steps of:

[0096] 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;

[0097] By pressurizing the core shaft assembly 2, the locking screw 23 drives the core shaft pull rod 21 to move, thereby adjusting the radial tension of the square cylinder 32 on the open spring jacket 3, so that the expansion of the square cylinder 32 reaches 60% to 80% of the pre-expansion amount;

[0098] After the square cylinder 32 is adjusted to the pre-expansion amount, the radial runout of the square cylinder 32 relative to the center of the core shaft pull rod 21 at the cross section of the winding limit sleeve 41 is measured;

[0099] After tightening the locking screw 23, the expansion 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.

[0100] Therefore, by using the core shaft assembly 2, the tension and pre-expansion of the open spring sleeve 3 can be accurately controlled, and high-precision clamping of the winding limit sleeve 41 can be achieved. This not only improves the positioning processing accuracy of the winding limit sleeve 41, realizes gap-free clamping of the core shaft and the inner hole, but also improves processing accuracy and efficiency.

[0101] Although the present invention is disclosed as above, the scope of protection disclosed by 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 scope of protection of the present invention.

Claims

1. A multi-turn winding expansion mandrel tooling, characterized in that: include: A tailstock assembly, the tailstock assembly comprising a coaxially connected spring tailstock and a limit stopper, the spring tailstock comprising a coaxially integrally connected tailstock body and a tailstock flange; 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 face of the spindle pull rod, the spring being sleeved on the spindle pull rod; The core shaft 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; A first guide hole, a second guide hole, and a third guide hole are coaxially connected to each other in sequence at the inner center of the tailstock flange and the tailstock body, wherein the diameter of the second guide hole is larger than that of the first guide hole and the third guide hole; The first straight section is adapted to be inserted into the third guide hole through the first guide hole and the second guide hole, and the second straight section is adapted to slide 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. An open spring collet comprises a first flange section and a square cylinder coaxially connected and integrally connected, wherein an end of the first flange section away from the square cylinder is adapted to be connected to an end surface of the tailstock assembly to form an accommodating space inside the tailstock assembly and the open spring collet for accommodating the sliding movement of the spindle assembly; 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; 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 formed at the center of each end surface of the square cylinder. One end of the first through slot extends to communicate with the circular hole, and the other end extends to the end of the square cylinder. A winding limit sleeve assembly is sleeved on the outer circumference of the square cylinder; One end of the core shaft pull rod is suitable for inserting into the tailstock assembly, and the other end is suitable for inserting into the open spring sleeve. When the locking screw is spirally screwed in and out, the core shaft 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: 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.

3. The multi-turn winding expansion mandrel tooling according to claim 1, characterized in that: The open spring collet further comprises 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.

4. The multi-turn winding expansion mandrel tooling according to claim 1, characterized in that: The winding limit sleeve assembly includes a plurality of winding limit sleeves and ring spacer sleeves which are passed through 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.

5. The multi-turn winding expansion mandrel tooling according to claim 4, 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, coaxially and integrally connected to both side surfaces of the disc body; A square hole is formed in the center of the disc body and the boss, and the square hole is adapted to the outer contour of the square cylinder so that the square cylinder is suitable for being inserted into the square hole.

6. The multi-turn winding expansion mandrel tooling according to claim 5, characterized in that: 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 being located on one side of the winding limit sleeve and the ring spacer, and the wire end pressing component including: 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, sleeved on the cam core shaft and located between the cam and the winding limit sleeve; a receiving groove suitable for accommodating the torsion spring is formed on a 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 connected to the 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 adapted to be rotated and pressed against the outer circumferential surface of the ring spacer so as to press the end of the winding wire against the contact surface between the ring spacer and the cam.

7. A method for using the multi-turn winding expansion mandrel tooling according to any one of claims 1 to 6, characterized in that: The method of use comprises the steps of: The winding limit sleeve assembly and the core shaft assembly are respectively installed on the inner and outer sides of the open spring jacket; By pressurizing the core shaft assembly, the locking screw drives the core shaft pull rod to move, thereby adjusting the radial tension of the square cylinder on the open spring clamp, so that the expansion of the square cylinder reaches 60% to 80% of the pre-expansion amount; After adjusting the square cylinder to the pre-expansion amount, measure the radial runout of the square cylinder relative to the center of the core shaft pull rod at the cross section of the winding limit sleeve; 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 make the winding limit sleeve have a single-side interference of 1 to 3 μm after installation.

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