Telescopic knife handle with constant pre-pressure

Abstract

The utility model relates to the technical field of numerical control machining, in particular to a telescopic cutter handle with constant pre-pressure, which comprises a cutter handle main body, and a telescopic groove is arranged at the other end of the 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 spring is arranged at one end of the mandrel in a sleeving mode, and the two ends of the pre-pressing spring 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 manifestation is that the initial cutting force is zero, resulting in the tap not being able to 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. Utility Model Content

[0003] In order to solve the above problems, the purpose of the present utility model is to provide a telescopic tool handle with constant pre-pressure. The telescopic tool handle adopts a single spring pre-pressure. The pre-pressure of the spring, that is, the initial cutting force, can be designed 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.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the present utility model is as follows.

[0005] A telescopic tool handle with constant preload, comprising:

[0006] 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;

[0007] 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;

[0008] 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;

[0009] A pre-stress spring is sleeved on one end of the core shaft, and both ends of the pre-stress spring are respectively connected to the telescopic groove and one side of the pre-stress part to squeeze the pre-stress part to the other side to directly abut against the anti-slip part.

[0010] 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 spring, which can be extended or retracted to achieve synchronization and match the thread. When stationary, the preload spring 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.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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.

[0017] Furthermore, a third sealing ring is provided between the core shaft and the core sleeve.

[0018] The beneficial effect of the utility model is that the traditional double-spring counter-pressure is replaced by a single-spring pre-pressure, which overcomes the defect that the initial force of the traditional double-spring counter-pressure is offset to zero; the single-spring pre-pressure can design the spring pre-pressure, 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 a uniform tapping depth. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional view of the present utility model.

[0020] 1. Tool handle body; 11. Spindle connection; 12. Telescopic slot; 13. Injection port;

[0021] 2. Core sleeve; 21. Telescopic hole; 22. Anti-slip part; 23. Torque groove;

[0022] 3. Mandrel; 31. Tool connection position; 32. Pre-pressing part; 33. Sliding ball; 34. Mandrel cavity;

[0023] 4. Pre-loaded spring;

[0024] 5. Shell;

[0025] 6. Torque ball; 61. Pressure regulating nut; 62. Spring sleeve; 63. Spring sheet;

[0026] 7. First sealing ring;

[0027] 8. Second sealing ring;

[0028] 9. The third sealing ring. DETAILED DESCRIPTION

[0029] 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.

[0030] See also Figure 1 , this embodiment provides a telescopic tool handle with constant preload, comprising:

[0031] 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;

[0032] 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;

[0033] 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;

[0034] The pre-compression spring 4 is sleeved on one end of the core shaft 3 , and both ends of the pre-compression spring 4 are respectively connected to the telescopic groove 12 and one side of the pre-compression part 32 to squeeze the pre-compression part 32 to the other side to directly abut against the anti-slip part 22 .

[0035] 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 .

[0036] 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 .

[0037] In this embodiment, the telescopic knife handle also includes an outer shell 5, a torque ball 6, a spring sleeve 62, an elastic sheet 63 and a pressure-adjusting nut 61; the outer shell 5 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 6 is provided in the torque groove 23, and one side of the torque ball 6 is abutted on the outer shell 5, the spring sleeve 62, the elastic sheet 63 and the pressure-adjusting nut 61 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 61, so that the spring sleeve 62 is abutted against the other side of the torque ball 6.

[0038] In this embodiment, there are three torsion grooves 23 and three torsion balls 6 , and the three torsion grooves 23 are evenly arranged around the outer side of the core sleeve 2 , and the three torsion balls 6 are respectively disposed in the three torsion grooves 23 .

[0039] 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.

[0040] 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 .

[0041] In this embodiment, a third sealing ring 9 is provided between the core shaft 3 and the core sleeve 2 .

[0042] 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 telescopic tool handle with constant preload, 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 pre-stress spring is sleeved on one end of the core shaft, and both ends of the pre-stress spring are respectively connected to the telescopic groove and one side of the pre-stress part to squeeze the pre-stress part to the other side to directly abut against the anti-slip part.

2. A telescopic tool handle with constant preload 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.

3. The telescopic tool handle with constant preload 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.

4. A telescopic tool handle with constant preload according to any one of claims 1 to 3, 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.

5. The telescopic tool handle with constant preload according to claim 4, 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.

6. A telescopic tool handle with constant preload according to any one of claims 1 to 3, 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.

7. The telescopic tool handle with constant preload according to claim 6, 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.

8. The telescopic tool handle with constant preload according to claim 6, characterized in that: A third sealing ring is provided between the core shaft and the core sleeve.

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