Low-frequency vibration drilling cutter handle

Abstract

The utility model belongs to the technical field of drilling tools, and particularly discloses a low-frequency vibration drilling tool handle which comprises a shell, a tool handle body and a tool bar. A fixing base is fixedly installed in the shell, and the cutter handle is rotationally connected with the fixing base. A fixing sleeve is arranged at the bottom of the fixing seat, an adjusting disc is in threaded connection in the fixing sleeve, and an amplitude plate driving part is mounted at the bottom of the adjusting disc; the cutter bar and the cutter handle are in sliding connection in the axial direction. An amplitude plate is fixedly arranged at the upper end of the cutter bar. A pre-tightening spring is arranged between the lower portion of the cutter bar and the shell, and under the elastic force effect of the pre-tightening spring, the amplitude profile of the amplitude plate is attached to the amplitude plate driving piece all the time. The vibration amplitude adjusting device is ingenious in structural design, the vibration amplitude adjusting function and the friction surface lubricating function are achieved through the adjusting disc, and the vibration amplitude adjusting device has the advantages of being low in structural cost, convenient to adjust vibration amplitude, convenient to maintain and long in service life.

Description

Technical Field

[0001] This utility model belongs to the field of drilling tool technology, specifically relating to a low-frequency vibration drilling tool holder. Background Technology

[0002] Currently, when drilling on CNC machine tools, the "drilling cycle" command is mostly used to achieve chip breaking and removal, which greatly increases the processing time. On many hydraulically fed specialized drilling machines, centrally cooled cutting tools are often used for cooling and to assist in chip removal, thus improving drilling quality to some extent. However, this significantly increases the purchase cost of drill bits, and the degree of improvement is limited.

[0003] With the continuous development of materials technology, the application of various difficult-to-machine materials such as high-strength steel, stainless steel, titanium alloy, and high-temperature alloy is becoming increasingly widespread. Traditional drilling technology is difficult to meet their processing requirements. During the processing, there are problems such as large cutting force, high cutting temperature and severe tool wear, poor surface roughness and low processing accuracy.

[0004] Vibratory drilling involves applying a regular vibration to the drill bit or workpiece during the drilling process, causing intermittent contact between the drill bit and the workpiece, resulting in better machining effects. Currently, mechanical low-frequency vibration cutting has significant advantages in machining holes in difficult-to-machine materials due to its characteristics of requiring no additional power source, easy motion control, and low cost.

[0005] However, the existing mechanical low-frequency vibration drilling tool holder technology is still immature, with problems such as complex structural design, difficulty in controlling assembly errors, inability to flexibly adjust the amplitude according to processing needs, and lack of lubrication of the vibration plate friction surface, resulting in a significant reduction in service life.

[0006] For example, patent document CN 117505908A discloses a longitudinal torsion composite vibration drill reamer holder, which includes a housing, a vibration generating part, a vibration output part, a first tool holder and a second tool holder. The vibration generating part includes a vibratory disk and roller disk assemblies disposed on both sides of the vibratory disk. Both roller disk assemblies have drive rollers. Both sides of the vibratory disk are provided with drive surfaces. The drive rollers on both sides can roll synchronously along the drive surfaces on the corresponding sides to drive the vibratory disk to slide back and forth axially. The tool holder has the following technical defects: First, its structural design is relatively complex and costly. This structure requires the drive rollers on both sides to roll synchronously along the corresponding drive surfaces to achieve the axial reciprocating sliding of the vibratory feeder. However, the assembly error between the drive rollers on both sides and the drive surfaces on both sides of the vibratory feeder is difficult to control, making it difficult to achieve synchronous drive. Second, the amplitude of the vibratory feeder cannot be adjusted due to the limitation imposed by the drive rollers on both sides, which greatly limits the applicable processing range. Furthermore, this structure means that the drive surfaces (i.e., friction surfaces) on both sides of the vibratory feeder cannot be lubricated with the drive rollers, which will wear out severely over time and greatly reduce the service life. Utility Model Content

[0007] The technical problem to be solved by this utility model is to provide a low-frequency vibration drilling tool holder with a simple and ingenious structural design, low cost, convenient amplitude adjustment, and long service life.

[0008] To solve the above-mentioned technical problems, the technical solution of this utility model is: a low-frequency vibration drilling tool holder, including a housing, a tool holder connected to the machine tool spindle, and a tool bar for clamping the tool;

[0009] A fixed base is fixedly installed inside the housing, and the tool holder is rotatably connected to the fixed base; a fixed sleeve is provided at the bottom of the fixed base, and an adjusting plate is threadedly connected to the fixed sleeve; an amplitude plate driver is installed at the bottom of the adjusting plate.

[0010] The lower part of the handle is provided with a spline, and the inside of the tool bar is provided with a keyway that mates with the spline. The tool bar and the handle are slidably connected along the axial direction. An amplitude plate is fixedly provided at the upper end of the tool bar, and the upper end surface of the amplitude plate forms an amplitude profile. A preload spring is provided between the lower part of the tool bar and the housing. Under the elastic force of the preload spring, the amplitude profile of the amplitude plate is always in contact with the amplitude plate drive component.

[0011] As a preferred technical solution, the adjusting disc includes an upper disc body, a middle disc body, and a lower disc sleeve arranged sequentially along the axial direction;

[0012] The upper plate has threads on its outer circumferential surface and is connected to the fixed sleeve via the threads. The middle plate has multiple cross-sections on its outer circumferential surface, with oil injection holes spaced apart on the cross-sections. A mounting hole is provided on the cross-section between two adjacent oil injection holes, and a plug screw is provided in the mounting hole. The middle plate has mounting grooves corresponding to the mounting holes, and an amplitude plate driver is installed in each mounting groove via a plug screw.

[0013] As a preferred technical solution, a bearing is fitted on the tool holder, and the preload spring is disposed between the bearing and the housing.

[0014] As a preferred technical solution, the upper end of the tool bar is provided with a sealing sleeve fitted on the outer periphery of the amplitude plate, and a sealing ring is provided between the sealing sleeve and the lower plate sleeve.

[0015] As a preferred technical solution, the amplitude plate driving component is a roller or a bearing.

[0016] As a preferred technical solution, a stop block is installed at at least one oil injection hole, a limiting groove is provided on the fixing sleeve to engage with the stop block, and an operation window is provided on the housing at the stop block.

[0017] As a preferred technical solution, an anti-rotation handle is fixedly installed on the upper part of the housing.

[0018] As a preferred technical solution, the amplitude plate includes a base plate and a wear-resistant liner covering the base plate, wherein the wear-resistant liner is formed with the amplitude profile.

[0019] As a preferred technical solution, the amplitude profile is a wavy curved surface, which unfolds into a sinusoidal curved surface.

[0020] As a preferred technical solution, a decorative cover is fitted onto the housing, and the decorative cover is threadedly connected to the housing.

[0021] Compared with the prior art, the present invention has at least the following beneficial effects:

[0022] (1) By using a fixed sleeve and an adjusting plate to slide the tool holder and the tool shank along the axial direction, and fixing an amplitude plate at the upper end of the tool holder, and setting a pre-tightening spring between the lower part of the tool holder and the housing, this structure design is simple and ingenious. Under the elastic force of the pre-tightening spring, the amplitude profile of the amplitude plate at the upper part of the tool holder is always in contact with the amplitude plate drive component, so that the drill bit can superimpose a regular low-frequency reciprocating motion along the axial direction during the constant feed process of drilling, so that the feed changes periodically and becomes intermittent processing, achieving obvious chip breaking and smooth chip removal, and the surface quality of the hole wall is significantly improved after processing.

[0023] (2) After the stop block is disassembled and installed, the amplitude of the tool bar can be easily adjusted by rotating the adjustment plate, and the friction surface of the amplitude plate can be lubricated and maintained by the oil injection hole on the adjustment plate. In other words, the amplitude adjustment function and the friction surface lubrication function can be achieved by using one component. It has the advantages of low structural cost, convenient amplitude adjustment, convenient maintenance and long service life. Attached Figure Description

[0024] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the present invention. Wherein:

[0025] Figure 1 This is a schematic diagram of the external structure of an embodiment of the present utility model;

[0026] Figure 2 This is a cross-sectional structural schematic diagram of an embodiment of the present utility model;

[0027] Figure 3 This is a schematic diagram of the external structure of the knife handle in an embodiment of this utility model;

[0028] Figure 4 This is a cross-sectional view of the knife handle in an embodiment of this utility model;

[0029] Figure 5 This is a top view of the tool holder in an embodiment of this utility model;

[0030] Figure 6 This is a cross-sectional view of the tool holder in an embodiment of this utility model;

[0031] Figure 7 This is a schematic diagram of the amplitude plate in an embodiment of this utility model;

[0032] Figure 8 This is a structural schematic diagram of the fixing base in an embodiment of this utility model;

[0033] Figure 9 This is a schematic diagram of the structure of the adjusting disc in an embodiment of this utility model;

[0034] Figure 10 This is an assembly diagram of the adjusting disk and the amplitude plate drive component in an embodiment of this utility model;

[0035] Figure 11 This is a schematic diagram of the structure of this utility model when the decorative cover is removed;

[0036] Figure 12 This is a schematic diagram of the structure of this utility model embodiment when the decorative cover and the shell are removed.

[0037] In the diagram: 1-House; 11-Sealing ring; 12-Decorative cover; 13-Operating window; 2-Tool holder; 21-Mounting part; 22-Spline; 3-Tool bar; 31-Keyway; 32-Amplitude plate; 321-Base plate; 322-Wear-resistant liner; 323-Amplitude profile; 33-Sealing sleeve; 4-Fixing seat; 41-Fixing sleeve; 42-Limiting slot; 5-Plug screw; 6-Amplitude plate drive component; 7-Anti-rotation handle; 8-Stop block; 9-Adjusting disc; 91-Upper disc body; 92-Middle disc body; 93-Lower disc sleeve; 94-Oil injection hole; 95-Mounting hole; 96-Mounting groove; 97-Oil injection channel; 10-Preload spring. Detailed Implementation

[0038] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the following detailed description, only certain exemplary embodiments of the present invention are described by way of illustration. Undoubtedly, those skilled in the art will recognize that various modifications can be made to the described embodiments without departing from the spirit and scope of the present invention. Therefore, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

[0039] like Figures 1 to 7 As shown, a low-frequency vibration drilling tool holder includes a housing 1, a tool holder 2, and a tool shank 3. The upper part of the tool holder 2 has a mounting part 21 for connecting to a machine tool spindle. The lower part of the tool holder 2 has a spline 22. The tool shank 3 has a keyway 31 inside that mates with the spline 22. The tool shank 3 and the tool holder 2 are slidably connected axially. The lower end of the tool shank 3 is used to hold the cutting tool, and the upper end of the tool shank 3 is fixedly connected to an amplitude plate 32 by a fixing pin. A fixing seat 4 is fixedly installed inside the housing 1. The middle part of the tool holder 2 is rotatably connected to the fixing seat 4 through bearings I and II. When the machine tool spindle rotates, it can drive the tool holder 2 to rotate, and the tool shank 3 rotates simultaneously with the tool holder 2.

[0040] In one specific manner, an anti-rotation handle 7 is fixedly installed on the upper part of the housing 1. The anti-rotation handle 7 is used to connect with the machine tool housing so that the fixed seat 4 remains fixed during the rotation of the tool holder 2.

[0041] refer to Figure 2 and Figure 8 The bottom of the fixed base 4 is provided with a fixed sleeve 41, and the fixed sleeve 41 is internally threaded with an adjusting disc 9. By rotating the adjusting disc 9, the adjusting disc 9 can be adjusted up and down along the axial direction to achieve the corresponding amplitude adjustment.

[0042] refer to Figure 9 and Figure 10The adjusting disc 9 includes an upper disc body 91, a middle disc body 92, and a lower disc sleeve 93 arranged sequentially along the axial direction. The upper disc body 91 has threads on its outer circumferential surface and is connected to the fixing sleeve 41 via these threads. The middle disc body 92 has multiple cross-sections on its outer circumferential surface and two or more oil injection holes 94 arranged circumferentially, with the oil injection holes 94 spaced apart on the cross-sections. In this embodiment, five oil injection holes 94 are provided. By rotating the adjusting disc 9 according to the required amplitude adjustment, the amplitude can be adjusted in five strokes.

[0043] Mounting holes 95 are provided on the cross-section between two adjacent oil injection holes 94. A plug screw 5 is installed in each mounting hole 95. The middle plate body 92 has mounting grooves 96 corresponding to the mounting holes 95. An amplitude plate drive component 6 is installed in each mounting groove 96 via a plug screw 5. The amplitude plate drive component 6 can be a rolling element such as a roller or bearing. The bottom of the adjusting plate 9 has oil injection channels 97 corresponding to and communicating with each oil injection hole 94. This structural design of the adjusting plate 9 facilitates both amplitude adjustment and lubrication of the friction surfaces, thereby greatly simplifying the structure of the low-frequency vibration drilling tool holder and reducing manufacturing costs.

[0044] In this embodiment, stop blocks 8 are installed at the two oil injection holes 94 respectively. The stop blocks 8 are provided with fixing holes for fixing with screws; see reference. Figure 8 and Figure 12 The outer wall of the fixed sleeve 41 is provided with a limiting groove 42 that engages with the stop block 8. After the adjusting plate 9 is adjusted to the position, the stop block 8 is fixed to the adjusting plate 9 with screws. The limiting groove 42 formed on the fixed sleeve 41 limits the stop block 8. The structure is ingenious and compact.

[0045] refer to Figure 11 An operation window 13 is provided on the housing 1 at the stop block 8, so that the adjustment plate 9 can be rotated or lubricated through the space reserved in the operation window 13 without disassembling the housing 1, making adjustment operation and maintenance convenient.

[0046] refer to Figure 1 To improve the aesthetic appearance, a decorative cover 12 is fitted onto the housing 1, which can cover the operating window 13. The decorative cover 12 is preferably connected to the housing 1 by threads, and can be quickly unscrewed from the bottom of the housing 1 for adjustment or maintenance.

[0047] refer to Figure 7In this embodiment, the amplitude plate 32 includes a base plate 321 and a wear-resistant liner 322 covering the base plate 321. The wear-resistant liner 322 is made of high carbon chromium bearing steel, and an amplitude profile 323 is formed on the wear-resistant liner 322. The amplitude profile 323 is a wavy curved surface, which unfolds into a sinusoidal curved surface so as to cooperate with the amplitude plate driving component 6 to drive the tool bar 3 to achieve periodic vibration along the axial direction.

[0048] A preload spring 10 is provided between the lower part of the tool holder 3 and the housing 1. In this embodiment, a bearing III is mounted on the tool holder 3, and the preload spring 10 is located between the bearing III and the housing 1. Thus, under the elastic force of the preload spring 10, the amplitude profile 323 of the amplitude plate 32 can always be in contact with the amplitude plate drive member 6. By rotating the adjusting disc 9, the preload of the preload spring 10 can be changed by raising or lowering the adjusting disc 9 relative to the fixed sleeve 41, thereby achieving amplitude adjustment.

[0049] refer to Figure 2 and Figure 6 The upper end of the cutter bar 3 is provided with a sealing sleeve 33 that is sleeved on the outer periphery of the amplitude plate 32. A sealing ring 11 is provided between the sealing sleeve 33 and the lower plate sleeve 93 of the adjusting plate 9 to achieve a sealing effect when the grease lubricates and maintains the friction surface (amplitude profile) of the amplitude plate 32.

[0050] The above-mentioned method for adjusting the amplitude of low-frequency vibration drilling tool holders includes the following steps:

[0051] S11. First, remove the decorative cover 12 from the housing 1, and remove the stop block 8 installed at the oil filling hole 94 from the operation window 13 of the housing 1.

[0052] S12. Then, use a screwdriver to rotate the adjustment disc 9 from the operation window 13 to raise or lower the adjustment disc 9 relative to the fixed sleeve 41 to change the pre-compression of the pre-tension spring 10, thereby achieving amplitude adjustment.

[0053] S13. According to the need for amplitude adjustment, rotate the adjustment disc 9 and rotate the other corresponding oil injection holes on the adjustment disc 9 to the operation window 13, and then lock the adjustment disc 9 with the stop block 8 to complete the amplitude adjustment.

[0054] The above-mentioned lubrication and maintenance method for low-frequency vibration drilling tool holders includes the following steps:

[0055] S21. Remove the decorative cover 12 from the housing 1, remove the stop block 8 installed at the oil filling hole 94 from the operation window 13 of the housing 1 and replace the oil filling nozzle.

[0056] S22. Using an oil gun, lubricating oil is injected from the oil nozzle into the oil injection hole. The lubricating oil enters the friction surface between the amplitude plate 32 and the amplitude plate drive component 6 through the oil injection channel connected to the oil injection hole.

[0057] S23. Remove the grease nipple and reinstall the stop block 8 to complete the lubrication maintenance.

[0058] This utility model uses a fixed sleeve and an adjusting plate to cooperate, and the tool bar and tool holder are slidably connected by a spline. By utilizing the pre-compression of the pre-tension spring, the amplitude can be easily adjusted. At the same time, oil injection holes are arranged circumferentially on the outer circumferential surface of the adjusting plate and a stop block is set. An operation window is opened on the housing to facilitate lubrication and maintenance.

[0059] This low-frequency vibration drilling tool holder features a simple and ingenious overall structural design. Under the elastic force of the preload spring, the amplitude profile of the amplitude plate on the upper part of the tool holder always fits against the amplitude plate drive component. This allows the drill bit to superimpose a regular low-frequency reciprocating motion along the axial direction during the constant feed process, causing the feed to change periodically and thus become intermittent machining. This results in significant chip breaking and smooth chip removal, and a noticeable improvement in the surface quality of the machined hole wall. Moreover, this structure allows for easy adjustment of the tool holder's amplitude by simply removing and installing the stop block, and also enables lubrication of the friction surface of the amplitude plate through the oil injection hole on the adjustment plate. By utilizing a single component, both amplitude adjustment and friction surface lubrication functions are achieved, resulting in advantages such as low structural cost, convenient amplitude adjustment, easy maintenance, and long service life.

[0060] The above description is merely an illustrative embodiment of this utility model and is not intended to limit the scope of this utility model. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of this utility model should fall within the protection scope of this utility model.

Claims

1. A low-frequency vibration drilling tool holder, comprising a housing, a tool holder connected to a machine tool spindle, and a tool shank for clamping the tool; characterized in that: A fixed base is fixedly installed inside the housing, and the tool holder is rotatably connected to the fixed base; a fixed sleeve is provided at the bottom of the fixed base, and an adjusting plate is threadedly connected to the fixed sleeve; an amplitude plate driver is installed at the bottom of the adjusting plate. The lower part of the handle is provided with a spline, and the inside of the tool bar is provided with a keyway that mates with the spline. The tool bar and the handle are slidably connected along the axial direction. An amplitude plate is fixedly provided at the upper end of the tool bar, and the upper end surface of the amplitude plate forms an amplitude profile. A preload spring is provided between the lower part of the tool bar and the housing. Under the elastic force of the preload spring, the amplitude profile of the amplitude plate is always in contact with the amplitude plate drive component.

2. The low-frequency vibration drilling tool holder as described in claim 1, characterized in that: The adjusting disc includes an upper disc body, a middle disc body, and a lower disc sleeve arranged sequentially along the axial direction; The upper plate has threads on its outer circumferential surface and is connected to the fixed sleeve via the threads. The middle plate has multiple cross-sections on its outer circumferential surface, with oil injection holes spaced apart on the cross-sections. An installation hole is provided on the cross-section between two adjacent oil injection holes, and a plug screw is provided in the installation hole. The middle plate has an installation groove corresponding to the installation hole, and an amplitude plate driver is installed in each installation groove via a plug screw.

3. The low-frequency vibration drilling tool holder as described in claim 2, characterized in that: The tool holder is fitted with a bearing, and the preload spring is located between the bearing and the housing.

4. The low-frequency vibration drilling tool holder as described in claim 3, characterized in that: The upper end of the cutter bar is provided with a sealing sleeve that is fitted around the outer periphery of the amplitude plate, and a sealing ring is provided between the sealing sleeve and the lower plate sleeve.

5. The low-frequency vibration drilling tool holder as described in claim 3, characterized in that: The amplitude plate driving component is a roller or a bearing.

6. The low-frequency vibration drilling tool holder as described in claim 3, characterized in that: At least one oil filling hole is equipped with a stop block, the fixed sleeve is provided with a limiting groove that engages with the stop block, and the housing is provided with an operation window located at the stop block.

7. The low-frequency vibration drilling tool holder as described in claim 1, characterized in that: An anti-rotation handle is fixedly installed on the upper part of the housing.

8. The low-frequency vibration drilling tool holder as described in claim 1, characterized in that: The amplitude plate includes a base plate and a wear-resistant liner covering the base plate, the wear-resistant liner being formed with the amplitude profile.

9. The low-frequency vibration drilling tool holder as described in claim 1, characterized in that: The amplitude profile is a wavy curved surface.

10. The low-frequency vibration drilling tool holder as described in claim 1, characterized in that: A decorative cover is fitted onto the housing, and the decorative cover is threadedly connected to the housing.

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