Magnetic tail handle adsorbs core shaft and thread cover tail handle punch

Abstract

The utility model provides a kind of magnetic tail handle adsorption mandrel and thread sleeve tail handle punch breaker, including mandrel rear section, mandrel rear section is installed in tail handle punch breaker;Blind hole is opened in mandrel front section, and one end away from blind hole is installed on the one end of mandrel rear section away from tail handle punch breaker;Suction member is set in blind hole, and two ends are respectively with mandrel rear section and mandrel front section abutment.This utility model is equipped with suction member in mandrel front section, mandrel front section is installed on mandrel rear section, and after installation, suction member in blind hole is realized the firm connection of mandrel front section and rear section, and ensure that magnetic force is effectively transmitted, mandrel rear section is installed in tail handle punch breaker, while breaking thread sleeve tail handle, automatically adsorbs broken tail handle waste, so that mandrel can take it out when withdrawing, in addition, the structure of built-in suction member and the connecting mode of installation by threaded fastening or interference enhance the reliability of overall mandrel structure, adsorption force, also effectively prolong service life.

Description

Technical Field

[0001] This utility model relates to the field of threaded sleeve installation tools, and in particular to the field of thread repair, specifically a magnetic tail shank adsorption mandrel and a threaded sleeve tail shank breaker. Background Technology

[0002] Wire thread inserts are widely used in threaded connections of automotive sheet metal parts, adjusting parts, etc. When installing a thread insert, a pilot hole needs to be drilled in the workpiece, leaving some space at the bottom. A special tool is required to screw the thread insert into the pre-drilled threaded hole. After installation, the shank needs to be broken off and removed. Because the shank of the thread insert is small, but the inner diameter of the insert is also small, after the mandrel breaks off the thread insert, the broken shank remains at the bottom of the workpiece, making it difficult to remove directly. This results in a time-consuming process for removing the shank remaining at the bottom of the workpiece.

[0003] A prior art patent, CN1114520C, discloses a bending shank breaking tool that can break the bending shank of a spiral coil insert with a bending shank inserted into a threaded hole of a workpiece, and can conveniently and accurately remove the broken bending shank. The tool has a shank (2), an operating part (3), and a permanent magnet (4) located at the front end of the operating part (3). Although in the same field, the operating part and permanent magnet are also disclosed, and the permanent magnet is either snap-fitted or glued to a recess (5), but other structural details are not disclosed.

[0004] The prior art discloses a highly efficient, leak-proof, tight-fitting steel wire threaded sleeve tail shank breaker (patent number CN219648490U), which includes a first sleeve with an air hole at the top and an opening at the bottom; the top of a second sleeve is inserted into the first sleeve and is tangential to the inner wall of the first sleeve, and the first sleeve moves up and down along the outer wall of the second sleeve; a firing pin is inserted into the port of the second sleeve away from the first sleeve; a firing pin retainer is installed between the firing pin and the second sleeve, and the head of the firing pin extends out of the firing pin retainer; a strong magnet is sleeved on the second guide section. This utility model uses the second sleeve as a fixed reference. The first sleeve impacts downward under manual driving, so that the firing pin gains breaking force. It is equipped with a firing pin retainer, which is perpendicular to the base material to facilitate breaking the tail shank and is easy to replace, adapting to different specifications of tail shanks. A strong magnet is used to transfer magnetism to the firing pin and the firing pin retainer. The strong magnet is not subjected to force during the whole movement, reducing the risk of breakage due to direct contact. The tail shank is directly attracted out by the firing pin. Although the fields and purposes are the same, the structures are different and the structures are complex.

[0005] A prior art patent (CN221640754U) discloses a tail shank breaking tool, comprising a handheld part and a push rod part. A magnetic element is provided at the end of the push rod part away from the handheld part, and the central axis of the handheld part is angled to the central axis of the push rod part. The handheld part facilitates gripping and force application, while the push rod part is used to extend into the threaded sleeve to break off the tail shank. The end of the push rod part away from the handheld part, which is the end extending into the threaded sleeve, is equipped with a magnetic element that attracts the broken tail shank out through magnetic force. This tail shank breaking tool combines the two processes of breaking and removing the tail shank into one, eliminating the need to remove the tool after the tail shank is broken and to use an additional tool to remove the broken tail shank. The angled central axis of the handheld part and the central axis of the push rod part makes it easier to grip the push rod part when extending it into the threaded sleeve, reducing the risk of slippage. This tail shank punching tool has the advantages of being easy to operate, easy and labor-saving to hold, and not easy to slip. Although it is in the same field, it also discloses the hand-held part and the magnetic part, and the magnetic part can also be enclosed. However, other structures are not disclosed, and the connection between the hand-held part and the truncated cone is not disclosed as a threaded connection. Therefore, it does not have the feature of replacing the magnetic part. Summary of the Invention

[0006] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a magnetic tail shank adsorption mandrel and threaded sleeve tail shank breaker to solve the difficulties of the prior art.

[0007] To achieve the above and other related objectives, this utility model provides a magnetic tailstock adsorption mandrel, comprising:

[0008] Mandrel rear section 1, wherein the mandrel rear section 1 is installed in the tail shank punch;

[0009] The front section 2 of the spindle has a blind hole 23 inside, and the end away from the blind hole 23 is installed on the end of the rear section 1 of the spindle away from the tail shank punch.

[0010] The adsorption element 3 is disposed in the blind hole 23, and its two ends abut against the rear section 1 and the front section 2 of the mandrel, respectively.

[0011] In this technical solution, an adsorption element 3 is provided inside the front section 2 of the mandrel. The front section 2 of the mandrel is installed on the rear section 1 of the mandrel. After installation, the adsorption element 3 is pressed against the blind hole 23 to achieve a firm connection between the front section 2 and the rear section of the mandrel and to ensure effective transmission of magnetic force. The rear section 1 of the mandrel is installed in the tail shank punch. While punching the threaded tail shank, it automatically adsorbs the broken tail shank waste, so that the mandrel can be taken out with it when it is withdrawn. In addition, the built-in structure of the adsorption element 3 and the connection method of thread fastening or interference fit enhance the reliability and adsorption force of the overall mandrel structure, and also effectively extend the service life.

[0012] According to the preferred embodiment, the rear section 1 of the mandrel includes:

[0013] The rear body 11 extends into the threaded sleeve during use;

[0014] The front connecting end 12 is integrally formed and has a reduced diameter at one end of the rear body 11 near the front section 2 of the spindle. The outer diameter of the rear body 11 is the same as the outer diameter of the front section 2 of the spindle.

[0015] The rear connecting end 13 is integrally formed and enlarged in diameter and is located at the end of the rear body 11 away from the front section 2 of the spindle.

[0016] Furthermore, the rear body 11, the front connecting end 12, and the rear connecting end 13 are coaxially arranged.

[0017] In this technical solution, the rear body 11, the front connecting end 12, and the rear connecting end 13 are coaxially arranged and form a stepped structure that increases in size sequentially. On the one hand, the reduced diameter front connecting end 12 makes the end of the rear body 11 form a platform for connection and restriction, which is used to dock with the front section 2 of the mandrel and keep the outer diameter consistent. The matching outer diameter achieves a seamless connection, ensuring that the force is evenly distributed when the tail shank is broken to ensure smooth transmission of the breaking force. On the other hand, the expanded diameter rear connecting end 13 is used to provide stable support when installed in the breaker and enhances the connection strength and stability of the overall structure of the mandrel in the threaded sleeve tail shank breaker.

[0018] According to the preferred embodiment, the length of the rear body 11 is much greater than the lengths of the front connecting end 12 and the rear connecting end 13.

[0019] Furthermore, the length of the front connecting end 12 is also less than the length of the rear connecting end 13.

[0020] In this technical solution, when the mandrel integral structure is installed in the threaded sleeve tail shank breaker, the sufficiently long rear body 11 can extend into the threaded sleeve tail shank breaker to provide stable support and connection. The shortest front connecting end 12 ensures a tight connection with the front section 2 of the mandrel through its effective length. The slightly longer rear connecting end 13 is used to enhance the installation contact area inside the threaded sleeve tail shank breaker. Through differentiated length design, the mandrel integral structure's ability to operate deeply and its operational stability within the narrow threaded sleeve are ensured. At the same time, the increased length of the rear body 11 and the rear connecting end 13 enhances the bonding strength with the threaded sleeve tail shank breaker.

[0021] According to the preferred embodiment, the front section 2 of the mandrel includes:

[0022] The front body 21 has a blind hole 23 inside, one end is open and has a side wall structure 24 around it, and the other end is closed and has a closed structure 25.

[0023] The connecting structure 22 is provided on the inner wall of the front body 21 near the front connecting end 12 to lock the front connecting end 12. After installation, the front connecting end 12 abuts against the adsorption component 3.

[0024] Blind hole 23, the sidewall of which is attached to the outer periphery of the adsorption element 3.

[0025] Furthermore, the length of the blind hole 23 is more than twice the length of the front connecting end 12.

[0026] In this technical solution, the front body 21 accommodates the adsorption element 3 through a blind hole 23 with one end open, and is locked and fixed to the front connecting end 12 of the rear section 1 of the mandrel using the inner connecting structure 22, so that the front connecting end 12 directly abuts against the adsorption element 3; the depth of the blind hole 23 is designed to be more than twice the length of the front connecting end 12, ensuring that the adsorption element 3 is fully embedded to obtain sufficient adsorption characteristics; the magnet is completely wrapped inside by the side wall structure 24 and the closed structure 25, which not only protects the magnet from impact damage during breakage, but also ensures that the magnetic force is efficiently transmitted to the front end through the locking abutment of the connecting structure 22, so as to realize the simultaneous completion of breaking the tail shank and adsorbing waste, significantly improving the adsorption force by 30% to 40%.

[0027] According to the preferred embodiment, the connecting structure 22 adopts an internal thread, and the outer circumference of the front connecting end 12 is provided with an external thread.

[0028] Furthermore, the inner diameter of the connecting structure 22 is slightly larger than the outer diameter of the adsorption element 3.

[0029] In this technical solution, the connecting structure 22 at one end of the front body 21 is used in conjunction with the front connecting end 12 with external threads through internal threads. During installation, the front section 2 and the rear section 1 of the mandrel are firmly connected by screwing the threads together. At the same time, the design of the inner diameter of the connecting structure 22 being slightly larger than the outer diameter of the adsorption component 3 ensures that the magnet assembly can be smoothly installed into the blind hole 23. The cooperation of the above structures not only ensures the smooth installation of the magnet assembly, but also ensures that the front connecting end 12 can tightly abut against the adsorption component 3, realizing the efficient transmission of adsorption force and significantly improving the success rate of adsorption after the tail shank is broken. In addition, the threaded mandrel front section 2 can be replaced in time after damage during high-speed breaking operations, improving the reusability of the overall structure and reducing production costs.

[0030] According to the preferred embodiment, the connection structure 22 and the front connection end 12 are fitted with an interference fit.

[0031] In this technical solution, the connection structure 22 and the front connection end 12 are fitted with an interference fit, which can effectively avoid the risk of loosening that may occur with threaded connections, ensure that the mandrel structure maintains extremely high connection rigidity and concentricity during high-speed punching operations, and at the same time, the radial pressure generated by the interference fit can effectively enhance the magnetic force transmission efficiency, minimize the magnetic field loss of the adsorption component 3, and significantly improve the stability and operational safety of the tail shank adsorption.

[0032] According to the preferred embodiment, the wall thickness of the closed structure 25 is not less than half the diameter of the adsorption element 3, and the wall thickness of the side wall structure 24 is not less than one-third the diameter of the adsorption element 3.

[0033] Furthermore, the diameter of the strong magnet used as the adsorption element 3 is ≥ Φ3mm, the wall thickness of the closed structure 25 is ≥ 1.5mm, and the wall thickness of the side wall structure 24 is ≥ 1mm.

[0034] In this technical solution, the wall thickness of the closed structure 25 is designed to be no less than half the diameter of the adsorption element 3 and the actual thickness is ≥1.5mm. The wall thickness of the side wall structure 24 is no less than one-third the diameter of the adsorption element 3 and the actual thickness is ≥1mm. At the same time, the diameter of the adsorption element 3 is ≥Φ3mm. By increasing the wall thickness of the front section 2 of the mandrel, the impact load generated when the tail shank is broken is withstood, ensuring that the front section 2 of the mandrel has sufficient structural strength to protect the internal magnet from damage, while maintaining the best magnetic flux transmission efficiency, thereby increasing the adsorption force by 30% to 40%, while meeting the mechanical strength requirements in a small space, and significantly improving the service life and operational reliability of the tool.

[0035] According to the preferred embodiment, the adsorption element 3 is a strong magnet.

[0036] Furthermore, the adsorption component 3 is equipped with multiple strong magnets that are tightly fitted together front and back.

[0037] In this technical solution, the magnetic attraction effect of multiple magnets superimposed is used to achieve the synchronous operation of breaking and removing the workpiece, avoiding the problem of having to spend extra time to remove the tail shank remaining at the bottom of the workpiece, and significantly improving the installation efficiency.

[0038] According to the preferred scheme, the front section 2 of the mandrel is made of a high permeability alloy material.

[0039] In this technical solution, the front section 2 of the mandrel is made of a high-permeability alloy material, which can efficiently transmit the strong magnetic force of the adsorption component 3 to the front operating part, significantly enhance and optimize the magnetic field distribution, and increase the adsorption force by 30% to 40%. At the same time, the high-hardness alloy material can effectively resist mechanical impact and wear during the punching operation, extend the overall service life of the mandrel, and ensure the reliability and stability of the magnetic adsorption operation.

[0040] According to the preferred embodiment, a threaded sleeve tail shank punching device with magnetic tail shank adsorption mandrel is used, including a magnetic tail shank adsorption mandrel and a sleeve 4, wherein the rear section 1 of the mandrel in the magnetic tail shank adsorption mandrel is installed in the sleeve 4.

[0041] The rear connecting end 13 is fitted with a spring 5;

[0042] The adsorption element 3 is positioned to expose the sleeve 4.

[0043] In this technical solution, the rear section 1 of the mandrel is installed inside the sleeve 4, so that the adsorption component 3 protrudes from the front end of the sleeve 4 to contact the threaded sleeve to break the tail shank. At the same time, the spring 5 installed on the outer sleeve of the rear connecting end 13 provides buffering and reset functions. The advantage is that the spring 5 can effectively absorb the impact and vibration during the breaking operation, protect the mandrel structure, and the exposed design of the adsorption component 3 ensures that the magnetic field acts on the tail shank without obstruction, realizing synchronous adsorption at the moment of breaking, completely solving the problem of tail shank residue in the blind hole, and improving the installation efficiency by more than 30%.

[0044] This invention employs a mandrel front section 2 with an adsorption element 3 installed inside. The mandrel front section 2 is mounted on the mandrel rear section 1. After installation, the adsorption element 3 is pressed against the blind hole 23 to achieve a firm connection between the mandrel front section 2 and the rear section, ensuring effective transmission of magnetic force. The mandrel rear section 1 is installed in the tailstock punch, automatically adsorbing the broken tailstock waste while punching the threaded tailstock, allowing the mandrel to be pulled out along with it during retraction. Furthermore, the built-in structure of the adsorption element 3 and the connection method of threaded fastening or interference fit enhance the reliability and adsorption force of the overall mandrel structure, while also effectively extending its service life.

[0045] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings, so as to facilitate an understanding of the features and advantages of the present invention. Attached Figure Description

[0046] Figure 1 The diagram shown is a three-dimensional structural schematic of Embodiment 1;

[0047] Figure 2 Shown as a cross-sectional view of Embodiment 1;

[0048] Figure 3 The diagram shown is an enlarged three-dimensional structural schematic of the rear section of the mandrel in Example 1.

[0049] Figure 4 The diagram shown is an enlarged three-dimensional structural schematic of the front section of the mandrel in Example 1;

[0050] Figure 5 The image shown is a cross-sectional view of the front section of the mandrel in Embodiment 1;

[0051] Figure 6 The diagram shown is a three-dimensional structural schematic of Example 2;

[0052] Figure 7 Shown as a cross-sectional view of Embodiment 2;

[0053] Label Explanation

[0054] 1. Rear section of the spindle; 11. Rear body section; 12. Front connecting end; 13. Rear connecting end;

[0055] 2. Mandrel front section; 21. Front section body; 22. Connecting structure; 23. Blind hole; 24. Side wall structure; 25. Enclosed structure.

[0056] 3. Adsorption components;

[0057] 4. Sleeve;

[0058] 5. Spring. Detailed Implementation

[0059] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0060] Compared to the embodiments shown in the accompanying drawings, feasible embodiments within the scope of protection of this utility model may have fewer components, have other components not shown in the drawings, different components, components arranged differently, or components with different connections, etc. Furthermore, two or more components shown in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0061] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, “an” or “a” and similar terms do not necessarily indicate a quantity limitation. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0062] This utility model proposes a magnetic tail shank adsorption mandrel and threaded sleeve tail shank breaker for use in thread processing tooling. This utility model does not limit the type of threaded sleeve, but the structure of the magnetic tail shank adsorption mandrel and threaded sleeve tail shank breaker is particularly suitable for the needs of automotive fastener production.

[0063] Example 1

[0064] The magnetic tailstock adsorption mandrel and threaded sleeve tailstock breaker proposed in this utility model mainly include a rear section 1 of the mandrel, a front section 2 of the mandrel, and an adsorption component 3. See also... Figure 1 It shows the arrangement of the rear section 1 of the mandrel, the front section 2 of the mandrel, and the adsorption component 3.

[0065] To achieve the goal of simultaneously breaking off the tail shank of the threaded sleeve and adsorbing the waste material of the tail shank onto the mandrel, this invention addresses the issue in the prior art where a pilot hole needs to be drilled in the workpiece during threaded sleeve installation, leaving space at the bottom of the workpiece. During installation, a special tool is required to screw the threaded sleeve into the pre-drilled threaded hole, and after installation, the tail shank needs to be broken off and removed. Because the tail shank of the threaded sleeve is small, but the inner diameter of the threaded sleeve is also small, after the mandrel breaks off the threaded sleeve, the broken tail shank remains at the bottom of the workpiece, making it difficult to remove directly and resulting in a time-consuming process. Therefore, the technical solution provided in this embodiment includes a mandrel rear section 1, a mandrel front section 2, and an adsorption component 3, all coaxially arranged. The mandrel front section 2 has a blind hole 23 installed on the mandrel rear section 1, and the adsorption component 3 is installed within the blind hole 23. The mandrel rear section 1 is installed in the tail shank breaker and, after installation, abuts against… The adsorption component 3 inside the blind hole 23 achieves a firm connection between the front section 2 and the rear section of the mandrel and ensures effective transmission of magnetic force. The rear section 1 of the mandrel is installed in the tail shank punch. While punching the threaded tail shank, it automatically adsorbs the broken tail shank waste, so that the mandrel can be taken out together when it is withdrawn, avoiding the need for additional action to remove the tail shank, reducing the overall installation time and improving efficiency. In addition, the built-in structure of the adsorption component 3 and the connection method of thread fastening or interference fit enhance the reliability and adsorption force of the overall mandrel structure, while also effectively extending its service life.

[0066] Specifically, such as Figure 3 As shown, the rear section 1 of the mandrel includes a rear body 11, a front connecting end 12, and a rear connecting end 13 arranged coaxially, forming a stepped structure that increases in size sequentially. When in use, the rear body 11 extends into the threaded sleeve. The front connecting end 12 is integral and has a reduced diameter, located at the end of the rear body 11 near the front section 2 of the mandrel. On the one hand, the reduced diameter front connecting end 12 makes the end of the rear body 11 form a platform for connection and restriction, and the outer diameter of the rear body 11 is the same as the outer diameter of the front section 2 of the mandrel. By docking with the front section 2 of the mandrel and maintaining the same outer diameter, the outer diameter matching achieves a seamless connection, ensuring uniform force distribution when the tail shank is broken, thus ensuring smooth transmission of the breaking force. On the other hand, the rear connecting end 13 is integral and has an expanded diameter, located at the end of the rear body 11 away from the front section 2 of the mandrel. The expanded diameter rear connecting end 13 is used to provide stable support when installed in the breaker, and enhances the connection strength and stability of the overall mandrel structure in the threaded sleeve tail shank breaker.

[0067] Based on this, when the mandrel integral structure is installed in the threaded sleeve tail shank breaker, the sufficiently long rear body 11 can extend into the threaded sleeve tail shank breaker to provide stable support and connection. Therefore, in this embodiment, the length of the rear body 11 is much greater than the length of the front connecting end 12 and the rear connecting end 13. Subsequently, the length of the front connecting end 12 is also less than the length of the rear connecting end 13. The function of the shorter front connecting end 12 is to ensure a tight connection with the front section 2 of the mandrel through its effective length, while the slightly longer rear connecting end 13 is used to enhance the installation contact area inside the threaded sleeve tail shank breaker. Through the differentiated length design, the ability of the mandrel integral structure to penetrate deeply into the narrow threaded sleeve and the operational stability are ensured. At the same time, the increased length of the rear body 11 and the rear connecting end 13 improves the bonding strength with the threaded sleeve tail shank breaker.

[0068] It should be specifically noted that the front section 2 of the mandrel used to mate with the rear section 1 of the mandrel includes a front section body 21 and a connecting structure 22. The front section body 21 accommodates the adsorption element 3 through a blind hole 23 with one end open. One end is open and has a side wall structure 24 forming all four sides, while the other end is closed to form a closed structure 25. The connecting structure 22 is provided on the inner wall of the front section body 21 near the front connecting end 12 to lock it in place. After installation, the front connecting end 12 abuts against the adsorption element 3, and the connecting structure 22 on the inner side connects with the front section 1 of the rear section 1 of the mandrel. The connecting end 12 is locked and fixed so that the front connecting end 12 directly abuts against the adsorption component 3. The magnet is completely wrapped inside by the side wall structure 24 and the closed structure 25, which not only protects the magnet from impact damage when it is broken, but also ensures that the magnetic force is efficiently transmitted to the front end through the locking abutment of the connecting structure 22. This allows the breaking of the tail shank and the adsorption of waste to be completed simultaneously, significantly improving the adsorption force by 30% to 40%. Preferably, the length of the blind hole 23 is more than twice the length of the front connecting end 12 to ensure that the adsorption component 3 is fully embedded to obtain sufficient adsorption characteristics.

[0069] As mentioned above, the rear section 1 and the front section 2 of the mandrel can be connected by either threaded locking or interference fit. When using threaded locking, the connecting structure 22 has an internal thread, while the outer circumference of the front connecting end 12 has an external thread. The connecting structure 22 at one end of the front section body 21 engages with the externally threaded front connecting end 12 via the internal thread. During installation, the front section 2 and the rear section 1 are securely connected by screwing the threads together. Simultaneously, the design of the inner diameter of the connecting structure 22 being slightly larger than the outer diameter of the adsorption component 3 ensures that the magnet assembly can be smoothly installed into the blind hole 23. This combination of structures ensures smooth installation of the magnet assembly and ensures that the front connecting end 12 tightly abuts against the adsorption component 3, achieving efficient transfer of adsorption force and significantly improving the success rate of adsorption after the tailstock is broken. Furthermore, the threaded connection of the front section 2 of the mandrel allows for timely replacement after damage during high-speed breaking operations, increasing the overall reusability of the structure and reducing production costs.

[0070] If an interference fit is used, the connection structure 22 and the front connection end 12 are connected by an interference fit, which can effectively avoid the risk of loosening that may occur with threaded connections, ensure that the mandrel structure maintains extremely high connection rigidity and concentricity during high-speed punching operations, and at the same time, the radial pressure generated by the interference fit can effectively enhance the magnetic force transmission efficiency, minimize the magnetic field loss of the adsorption component 3, and significantly improve the stability and operational safety of the tail shank adsorption.

[0071] In this embodiment, in order to ensure that the front section 2 of the mandrel has sufficient structural strength to protect the internal magnet from damage, and to maintain the best magnetic flux transmission efficiency, thereby increasing the adsorption force by 30% to 40%, while meeting the mechanical strength requirements in a small space, and significantly improving the tool's service life and operational reliability, the wall thickness of the closed structure 25 is designed to be no less than half the diameter of the adsorption element 3 and the actual thickness is ≥1.5mm, the wall thickness of the side wall structure 24 is no less than one-third the diameter of the adsorption element 3 and the actual thickness is ≥1mm, and the diameter of the adsorption element 3 is ≥Φ3mm.

[0072] Preferably, the adsorption component 3 is equipped with multiple strong magnets that are tightly attached to each other at the front and back. The magnetic attraction effect of the multiple magnets is used to realize the synchronous operation of breaking and removing the workpiece, avoiding the problem of the tail stick remaining at the bottom of the workpiece requiring extra time to remove, and significantly improving the installation efficiency.

[0073] Meanwhile, the front section 2 of the mandrel is made of a high magnetic permeability alloy material. This type of material can efficiently transmit the strong magnetic force of the adsorption component 3 to the front operating part, significantly enhance and optimize the magnetic field distribution, and increase the adsorption force by 30% to 40%. At the same time, the high hardness alloy material can effectively resist mechanical impact and wear during the punching operation, extend the overall service life of the mandrel, and ensure the reliability and stability of the magnetic adsorption operation.

[0074] Example 2

[0075] In this second embodiment, the magnetic tail shank adsorption mandrel provided in the first embodiment is installed inside the sleeve 4 of the punch to form a threaded tail shank punch.

[0076] Specifically, the rear section 1 of the mandrel is assembled inside the sleeve 4, and the rear connecting end 13 of the rear section 1 of the mandrel is fitted with a spring 5 from the punch to form a buffer system. In order to ensure smooth entry into the threaded sleeve and the adsorption effect, the adsorption component 3 protrudes from the front end of the sleeve 4 after installation, and can effectively act on the threaded sleeve.

[0077] During use, spring 5 can effectively absorb and release the instantaneous impact force generated during the punching process, protecting the spindle structure and effectively extending its service life; the exposed adsorption component 3 ensures lossless transmission of the magnetic field, realizing the synchronous completion of punching and adsorption, effectively solving the problem of tail shank residue in blind holes, and improving the tail shank removal efficiency by more than 30%.

[0078] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A magnetic tailstock adsorption mandrel, characterized in that, include: The rear section (1) of the mandrel is installed in the tail shank punch; The front section (2) of the spindle has a blind hole (23) inside, and the end away from the blind hole (23) is installed on the rear section (1) of the spindle away from the tail shank punch. The adsorption element (3) is disposed in the blind hole (23) and its two ends abut against the rear section (1) and the front section (2) of the mandrel respectively.

2. The magnetic tailstock adsorption mandrel according to claim 1, characterized in that, The rear section (1) of the mandrel includes: The rear body (11) extends into the threaded sleeve during use; The front connecting end (12) is integrally formed and has a reduced diameter at one end of the rear body (11) near the front section (2) of the spindle. The outer diameter of the rear body (11) is the same as the outer diameter of the front section (2) of the spindle. The rear connecting end (13) is integral and has an enlarged diameter and is located at the end of the rear body (11) away from the front section (2) of the spindle.

3. The magnetic tailstock adsorption mandrel according to claim 2, characterized in that, The length of the rear body (11) is much greater than the lengths of the front connecting end (12) and the rear connecting end (13).

4. The magnetic tailstock adsorption mandrel according to claim 3, characterized in that, The front section (2) of the mandrel includes: The front body (21) has a blind hole (23) inside, one end is open and has a side wall structure (24) around it, and the other end is closed to form a closed structure (25). The connecting structure (22) is provided on the inner wall of the front body (21) near the front connecting end (12) to lock the front connecting end (12). After installation, the front connecting end (12) abuts against the adsorption component (3). Blind hole (23), the sidewall of which is attached to the outer periphery of the adsorption element (3).

5. The magnetic tailstock adsorption mandrel according to claim 4, characterized in that, The connection structure (22) adopts an internal thread, and the outer circumference of the front connection end (12) is provided with an external thread.

6. The magnetic tailstock adsorption mandrel according to claim 5, characterized in that, The connection structure (22) and the front connection end (12) are fitted with an interference fit.

7. The magnetic tailstock adsorption mandrel according to claim 6, characterized in that, The wall thickness of the closed structure (25) is not less than half the diameter of the adsorbent (3), and the wall thickness of the side wall structure (24) is not less than one-third the diameter of the adsorbent (3).

8. The magnetic tailstock adsorption mandrel according to claim 7, characterized in that, The adsorption element (3) is a strong magnet.

9. The magnetic tailstock adsorption mandrel according to claim 8, characterized in that, The front section (2) of the mandrel is made of a high permeability alloy material.

10. A threaded sleeve tail shank breaker, employing the magnetic tail shank adsorption mandrel as described in any one of claims 1-9, characterized in that, It includes a magnetic tail shank adsorption mandrel and a sleeve (4), with the rear section (1) of the mandrel inside the magnetic tail shank adsorption mandrel installed inside the sleeve (4); The rear connecting end (13) is fitted with a spring (5); The adsorption element (3) is set to protrude from the sleeve (4).

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