Telescopic knife handle capable of being accurately reset

Abstract

The utility model relates to the technical field of numerical control machining, in particular to a telescopic cutter handle capable of being accurately reset, which comprises a cutter handle main body, a telescopic hole penetrating through the two ends of the core sleeve is formed in the core sleeve, an anti-falling part is arranged at the position, located on the side face of the telescopic hole, of the core sleeve, the core sleeve is connected with the other end of the knife handle body, and the telescopic hole communicates with the telescopic groove; one end of the mandrel is telescopically and movably arranged in the telescopic groove, and a pre-pressing part is further arranged at one end of the mandrel; and the pre-pressing elastic piece is arranged at one end of the mandrel in a sleeving mode, and the two ends of the pre-pressing elastic piece are connected to the telescopic groove and one side of the pre-pressing part correspondingly so as to extrude the pre-pressing part till the other side of the pre-pressing part can directly abut against the anti-disengaging part. According to the single spring prepressing, the prepressing force of the spring, namely the initial cutting penetration force, can be designed according to specification requirements, so that the cutting penetration is constant and stable, the tool is prevented from slipping due to friction, the tool is protected, the product quality is improved, and the uniform tapping depth is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of numerical control machining, in particular to a telescopic tool handle. Background Art

[0002] In the process of mechanical processing, drilling and tapping are often required, and the drilling and tapping process involves a tapping shank. For example, a telescopic tapping shank disclosed in a prior patent (application number 202222748615.5) includes a shank body, a cavity sleeve assembly, and a telescopic tapping mandrel. One end of the shank body is equipped with a cavity sleeve assembly to enclose a mandrel assembly groove; one end of the telescopic tapping mandrel is telescopically assembled in the mandrel assembly groove through a telescopic mechanism and a torque protection transmission mechanism, and a first sealing ring is provided between the outer wall of one end of the telescopic tapping mandrel and the inner wall of the mandrel assembly groove to form a sealed liquid-passing interval between the bottom wall of the mandrel assembly groove and the first sealing ring; the other end of the shank body is provided with a central liquid-passing groove connected to the sealed liquid-passing interval, and the other end of the telescopic tapping mandrel is provided with a tap assembly groove connected to the sealed liquid-passing interval. For the above-mentioned prior patent, it discloses a telescopic tapping shank with integrated synchronization, cooling (internal cooling), and torque protection, which can improve the quality and efficiency of tapping. However, some problems and defects still exist, resulting in unstable quality during use. The main manifestations are: 1. Because the initial cutting force is zero, the tap cannot engage the workpiece when it first contacts the workpiece. The tap rotates and rubs against the edge of the workpiece. When the tap rotates and feeds, it is compressed to a certain value, forming a pressure difference, generating cutting force, and starting to feed. The friction of the cutting edge on the workpiece wears the tool, also affecting the workpiece quality. Moreover, the time of engagement is uncertain, resulting in inconsistent tapping depth. 2. The original positioning of the design is unstable and prone to jamming. Utility Model Content

[0003] In order to solve the above problems, the purpose of the present invention is to provide a telescopic tool handle that can be accurately reset and has a constant cutting pre-pressure and cutting force.

[0004] Another object of the present invention is to provide a telescopic knife handle that can be accurately reset. When the telescopic knife handle is unloaded, it can be accurately and reliably reset.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the present utility model is as follows.

[0006] A telescopic tool handle capable of precise repositioning, characterized by comprising:

[0007] A tool handle body, wherein one end of the tool handle body is provided with a spindle connection position for connecting to an external machine tool spindle, and the other end of the tool handle body is provided with a telescopic slot;

[0008] A core sleeve, wherein a telescopic hole is provided in the core sleeve and passes through both ends thereof, and an anti-slip portion is provided on the side of the telescopic hole. The core sleeve is connected to the other end of the handle body, and the telescopic hole is connected to the telescopic slot;

[0009] A core shaft, one end of which is telescopically arranged in the telescopic slot, and the other end of which passes through the telescopic hole and is exposed to the outside to form a tool connection position for connecting a tapping tool, and a pre-pressing portion is further provided at one end of the core shaft;

[0010] A floating ring, wherein the floating ring is sleeved on one end of the core shaft, and one side of the core shaft abuts against one side of the pre-pressing portion;

[0011] The two ends of the pre-compression elastic member are respectively connected to the telescopic groove and the other side of the floating ring, so as to squeeze the pre-compression part to the other side through the floating ring and directly abut against the anti-slip part.

[0012] The tool connection position of the telescopic tool holder is equipped with a tool, and when the telescopic tool holder is installed on the spindle connection position for operation, the core shaft rotates under the force transmitted by the tool holder body and contacts the workpiece for processing. During processing, the tool is fed axially, and the axial force is axially balanced by the preload elastic member, which can be extended or retracted to achieve synchronization and match the thread. When stationary, the preload elastic member pushes the floating ring, and then pushes the core shaft to achieve axial reset, so that the next part can be processed smoothly without adjusting the tool; that is, the traditional double spring counter-pressing is changed to a single spring preload; the defect of the traditional double spring counter-pressing that the initial force is offset to zero is overcome; the single spring preload can design the spring preload, that is, the initial cutting force, according to the specification requirements, so that the cutting force is constant and stable, avoiding tool friction and slipping, protecting the tool, improving product quality, and ensuring uniform tapping depth. Moreover, the design of the floating ring makes the reset more accurate and reliable during unloading. During unloading, the floating ring returns to the original position of the anti-slip part under the thrust of the pre-loaded elastic part, ensuring that the zero position of the tool when it stops never changes, reducing the need for repeated tool setting, saving time and improving efficiency. It avoids the defects of unreliable reset and easy jamming and non-resetting.

[0013] Furthermore, the telescopic shank also includes a retaining ring, which is sleeved on one end of the core shaft, and one side of the retaining ring is abutted on the telescopic groove, and the two ends of the pre-stressed elastic member are respectively abutted on the other side of the telescopic groove and the other side of the floating ring.

[0014] Furthermore, the pre-stressed elastic member is a spring.

[0015] Furthermore, the pre-pressing portion is arranged around the outside of the core shaft; and the anti-slip portion is arranged around the inner side of the telescopic hole.

[0016] Furthermore, a sliding ball is movably provided on the pre-pressing portion, and the sliding ball is movably connected to the side surface of the telescopic groove.

[0017] Furthermore, the telescopic knife handle also includes a shell, a torque ball, a spring sleeve, an elastic sheet, and a pressure-adjusting nut; the shell is fixed to the other end of the knife handle body and is sleeved on the outside of the core sleeve; the outside of the core sleeve is provided with a torque groove, the torque ball is arranged in the torque groove, and one side of the torque ball abuts against the shell, the spring sleeve, the elastic sheet, and the pressure-adjusting nut are sleeved on the outside of the core sleeve in sequence, and the two sides of the elastic sheet abut against the spring sleeve and the pressure-adjusting nut respectively, so that the spring sleeve abuts against the other side of the torque ball. The elastic sheet is compressed by the adjusting nut, and the spring sleeve is pressed onto the torque ball through the elastic sheet, and the torque ball is pressed into the corresponding torque groove to achieve torque transmission. When the torque exceeds the set value, the torque ball is forced to slide out of the torque groove, the core sleeve slips, and the torque is no longer transmitted, thereby achieving the function of over-force protection to protect the tool holder and machine tool tools from damage due to over-force, playing a role of torque protection.

[0018] Furthermore, there are three torsion grooves and three torsion balls, and the three torsion grooves are evenly surrounded by the outer side of the core sleeve, and the three torsion balls are respectively arranged in the three torsion grooves.

[0019] Furthermore, the tool handle body is provided with an injection port at one end, and the mandrel is provided with a mandrel cavity extending through both ends thereof. One end of the mandrel cavity and the injection port are respectively connected to both ends of the telescopic slot. Cooling water (or air) is injected from the machine tool spindle through the injection port, flows through the mandrel cavity into the through-hole tap, and is ejected from the tap cutting tip to directly cool the workpiece processing area, the tap, and the punching iron pin.

[0020] Furthermore, a first sealing ring is provided between the core shaft and the telescopic groove; and a second sealing ring is provided at the other end of the core shaft cavity.

[0021] Furthermore, a third sealing ring is provided between the core shaft and the core sleeve.

[0022] The beneficial effect of this utility model is that it replaces the traditional double-spring counter-stressing with a single-spring preload, overcoming the defect of the traditional double-spring counter-stressing that the initial force is offset to zero. This single-spring preload can design the spring preload, i.e., the initial cutting force, according to the specification requirements, so that the cutting is constant and stable, avoiding friction and slippage of the tool, protecting the tool, improving product quality, and ensuring a uniform tapping depth. In addition, the design of the floating ring makes reset more accurate and reliable during unloading. During unloading, the floating ring returns to the original position of the anti-slip part under the thrust of the preload elastic member, ensuring that the zero position when the tool stops is always unchanged, reducing the need for repeated tool setting, saving time and improving efficiency, and avoiding the defects of other tools such as unreliable reset and easy jamming. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a cross-sectional view of the present utility model.

[0024] 1. Tool handle body; 11. Spindle connection; 12. Telescopic slot; 13. Injection port;

[0025] 2. Core sleeve; 21. Telescopic hole; 22. Anti-slip part; 23. Torque groove;

[0026] 3. Mandrel; 31. Tool connection position; 32. Pre-pressing part; 33. Sliding ball; 34. Mandrel cavity;

[0027] 4. Floating ring;

[0028] 5. Pre-loaded elastic member; 51. Retaining ring;

[0029] 6. Housing; 61. Torque ball; 62. Spring sleeve; 63. Spring sheet; 64. Pressure regulating nut

[0030] 7. First sealing ring;

[0031] 8. Second sealing ring;

[0032] 9. The third sealing ring. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0034] See also Figure 1 This embodiment provides a retractable tool handle that can be precisely reset, comprising:

[0035] The tool handle body 1 has a spindle connection position 11 connected to an external machine tool spindle at one end of the tool handle body 1, and a telescopic slot 12 at the other end of the tool handle body 1;

[0036] The core sleeve 2 is provided with a telescopic hole 21 passing through both ends thereof, and the core sleeve 2 is provided with an anti-slip portion 22 on the side of the telescopic hole. The core sleeve 2 is connected to the other end of the handle body 1, and the telescopic hole 21 is connected to the telescopic slot 12;

[0037] The mandrel 3 has one end that is telescopically arranged in the telescopic slot 12, and the other end of the mandrel passes through the telescopic hole 21 to be exposed to the outside to form a tool connection position 31 for connecting a tapping tool, and a pre-pressing portion 32 is further provided at one end of the mandrel 3;

[0038] The floating ring 4 is sleeved on one end of the core shaft 3, and one side of the core shaft 3 abuts against one side of the pre-pressing portion 32;

[0039] The pre-stressed elastic member 5 has two ends respectively connected to the telescopic groove 12 and the other side of the floating ring 4 , so as to squeeze the pre-stressed portion 32 to the other side through the floating ring 4 to directly abut against the anti-slip portion 22 .

[0040] In this embodiment, the telescopic tool handle also includes a retaining ring 51, which is sleeved on one end of the core shaft 3, and one side of the retaining ring 51 is abutted on the telescopic groove 12, and the two ends of the pre-stressed elastic member 5 are respectively abutted on the other side of the telescopic groove 12 and the other side of the floating ring 4.

[0041] In this embodiment, the pre-compression elastic member 5 is a spring.

[0042] In this embodiment, the pre-pressing portion 32 is disposed around the outer side of the core shaft 3 ; and the anti-slip portion 22 is disposed around the inner side of the telescopic hole 21 .

[0043] In this embodiment, a sliding ball 33 is movably provided on the pre-pressing portion 32 , and the sliding ball 33 is movably connected to the side surface of the telescopic slot 12 .

[0044] In this embodiment, the telescopic knife handle also includes an outer shell 6, a torque ball 61, a spring sleeve 62, an elastic sheet 63 and a pressure-adjusting nut 64; the outer shell 6 is fixed to the other end of the knife handle body 1 and is sleeved on the outside of the core sleeve 2; a torque groove 23 is provided on the outside of the core sleeve 2, and the torque ball 61 is provided in the torque groove 23, and one side of the torque ball 61 is abutted on the outer shell 6, the spring sleeve 62, the elastic sheet 63 and the pressure-adjusting nut 64 are sequentially sleeved on the outside of the core sleeve 2, and the two sides of the elastic sheet 63 are respectively abutted against the spring sleeve 62 and the pressure-adjusting nut 64, so that the spring sleeve 62 is abutted against the other side of the torque ball 61.

[0045] In this embodiment, there are three torsion grooves 23 and three torsion balls 61 , and the three torsion grooves 23 are evenly arranged around the outer side of the core sleeve 2 , and the three torsion balls 61 are respectively disposed in the three torsion grooves 23 .

[0046] In this embodiment, an injection interface 13 is provided at one end of the handle body 1, and the core shaft 3 is provided with a core shaft cavity 34 passing through both ends thereof. One end of the core shaft cavity 34 and the injection interface 13 are respectively connected to both ends of the telescopic slot 12.

[0047] In this embodiment, a first sealing ring 7 is provided between the core shaft 3 and the telescopic groove 12 ; a second sealing ring 8 is provided at the other end of the core shaft cavity 34 .

[0048] In this embodiment, a third sealing ring 9 is provided between the core shaft 3 and the core sleeve 2 .

[0049] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A retractable knife handle capable of precise repositioning, characterized in that: include: A tool handle body, wherein one end of the tool handle body is provided with a spindle connection position for connecting to an external machine tool spindle, and the other end of the tool handle body is provided with a telescopic slot; A core sleeve, wherein a telescopic hole is provided in the core sleeve and passes through both ends thereof, and an anti-slip portion is provided on the side of the telescopic hole. The core sleeve is connected to the other end of the handle body, and the telescopic hole is connected to the telescopic slot; A core shaft, one end of which is telescopically arranged in the telescopic slot, and the other end of which passes through the telescopic hole and is exposed to the outside to form a tool connection position for connecting a tapping tool, and a pre-pressing portion is further provided at one end of the core shaft; A floating ring, wherein the floating ring is sleeved on one end of the core shaft, and one side of the core shaft abuts against one side of the pre-pressing portion; The two ends of the pre-compression elastic member are respectively connected to the telescopic groove and the other side of the floating ring, so as to squeeze the pre-compression part to the other side through the floating ring and directly abut against the anti-slip part.

2. The precisely repositionable retractable tool handle according to claim 1, characterized in that: The telescopic shank also includes a retaining ring, which is sleeved on one end of the core shaft, and one side of the retaining ring abuts against the telescopic slot, and the two ends of the preloaded elastic member abut against the other side of the telescopic slot and the other side of the floating ring respectively.

3. The precisely repositionable retractable tool handle according to claim 2, characterized in that: The pre-compression elastic member is a spring.

4. The precisely repositionable retractable tool handle according to claim 1, characterized in that: The pre-pressing portion is arranged around the outside of the core shaft; the anti-slip portion is arranged around the inner side of the telescopic hole.

5. The precisely repositionable retractable tool handle according to claim 1, characterized in that: A sliding ball is movably provided on the pre-pressing portion, and the sliding ball is movably connected to the side surface of the telescopic groove.

6. A precisely repositionable telescopic knife handle according to any one of claims 1 to 5, characterized in that: The telescopic knife handle also includes an outer shell, a torsion ball, a spring sleeve, an elastic sheet and a pressure-adjusting nut; the outer shell is fixed to the other end of the knife handle body and is sleeved on the outside of the core sleeve; a torsion groove is provided on the outside of the core sleeve, the torsion ball is provided in the torsion groove, and one side of the torsion ball is abutted on the outer shell, the spring sleeve, the elastic sheet and the pressure-adjusting nut are sequentially sleeved on the outside of the core sleeve, and the two sides of the elastic sheet are respectively abutted against the spring sleeve and the pressure-adjusting nut, so that the spring sleeve is abutted against the other side of the torsion ball.

7. The precisely repositionable retractable tool handle according to claim 6, characterized in that: There are three torsion grooves and three torsion balls, and the three torsion grooves are evenly surrounded on the outside of the core sleeve, and the three torsion balls are respectively arranged in the three torsion grooves.

8. A precisely repositionable telescopic knife handle according to any one of claims 1 to 5, characterized in that: One end of the handle body is provided with an injection interface, and the core shaft is provided with a core shaft cavity passing through both ends thereof. One end of the core shaft cavity and the injection interface are respectively connected to both ends of the telescopic slot.

9. The precisely repositionable telescopic knife handle according to claim 8, characterized in that: A first sealing ring is provided between the core shaft and the telescopic groove; a second sealing ring is provided at the other end of the core shaft cavity.

10. The precisely repositionable telescopic knife handle according to claim 8, characterized in that: A third sealing ring is provided between the core shaft and the core sleeve.

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