Integral small-diameter eccentric fine boring cutter

Abstract

The utility model discloses an integral type small diameter eccentricity type fine adjustment boring cutter, it includes: handle, the eccentric shaft sleeve is sleeved in the handle, the inboard of eccentric shaft sleeve is sleeved with boring bar, the boring bar one end outside eccentric shaft sleeve is fixedly connected with blade through the plum blossom screw, the outside of handle is provided with mounting hole, the mounting hole is threadedly connected with fastening screw, through the effective processing depth of fine adjustment precision boring cutter of comparison boring bar + split body, can be used for boring small aperture deep hole processing (hole depth is greater than 3 times diameter), and compared with conventional integral type fine adjustment boring cutter, because adopt eccentricity type movement mode to adjust processing range, the overall size is smaller, thereby widen the processing range, and the boring cutter one end of the utility model eccentricity type adjustable boring cutter can install on numerical control machine tool spindle handle, after rough boring workpiece bore, according to the size after boring can through the mode of "dial pointer" fine adjustment, to realize high accuracy small deep hole processing.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, and in particular to an integrated small-diameter eccentric fine-tuning boring tool. Background Technology

[0002] Boring is a machining method to improve the surface quality of existing holes. The purpose of boring is to complete the machining of existing holes to achieve small hole deviations, positional deviations, and a high-quality surface. The difference between fine boring and reaming is that fine boring determines the final axial position based on the axis of the boring bar, while reaming relies more on the pre-made hole position to determine the final axial position. Reaming has poor ability to correct positional errors and original hole axis misalignment, and reamers are sizing tools with poor adaptability; one reamer can only machine holes of one size. To solve this problem, boring is usually chosen. Boring can correct the original hole axis misalignment through multiple fine-tuning cuts. A boring bar is a type of boring tool used for roughing, semi-finishing, or finishing existing holes. The most common application is internal hole machining, used to remove excess metal from the workpiece during hole enlargement.

[0003] Boring tools can be broadly classified into roughing tools and finishing tools, with finishing tools typically being single-edged. Depending on the diameter of the bore, large-diameter bores usually utilize an integrated, micro-adjustable finishing tool, while small-diameter bores typically employ a tool holder plus a separate, micro-adjustable finishing tool. When machining small-diameter bores with a tool holder plus a separate, micro-adjustable finishing tool, the diameter of the tool holder extending into the bore must be even smaller due to the smaller bore diameter. Furthermore, the effective extension length during boring is generally three times the diameter of the tool holder, significantly limiting the effective machining depth of the tool holder plus separate, micro-adjustable finishing tool. On the other hand, the integrated, micro-adjustable finishing tool has a complex head structure, making it unsuitable for machining small-diameter bores. Utility Model Content

[0004] The purpose of this invention is to provide an integrated small-diameter eccentric fine-tuning boring tool to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, an integrated small-diameter eccentric fine-tuning boring bar is provided, comprising: a tool holder, an eccentric bushing is fitted inside the tool holder, a boring bar is fitted inside the eccentric bushing, and a cutting blade is fixedly connected to one end of the boring bar outside the eccentric bushing by a Torx screw; The tool holder has a mounting hole on its outer side, and a fastening screw is threaded into the mounting hole. The boring bar has a tapered positioning hole on its outer side, and the end of the fastening screw is installed into the tapered positioning hole. The boring bar has a tool holder rear end directional groove inside one end of the eccentric bushing, and the tool holder has a directional pin inserted at the position directly opposite the boring bar, the directional pin extending into the tool holder rear end directional groove.

[0006] According to the integrated small-diameter eccentric fine-tuning boring tool, the side wall of the eccentric bushing is provided with a limiting groove, and the tapered positioning hole passes through the limiting groove.

[0007] According to the integrated small-diameter eccentric fine-tuning boring tool, the eccentric bushing has positive and negative scale lines on the side facing the cutting tool, and the tool holder has scale lines on the side facing the cutting tool, with one end of the scale line corresponding to the positive and negative scale lines.

[0008] According to the integrated small-diameter eccentric fine-tuning boring tool, the eccentric bushing has an adjustment end face on one side facing the cutting tool, and the adjustment end face is located outside the positive and negative scale lines.

[0009] According to the integrated small-diameter eccentric fine-tuning boring bar, a stop plate is provided on the outer side of the boring bar, and the boring bar extends into the inner side of the eccentric bushing on the side of the stop plate away from the cutting tool.

[0010] According to the integrated small-diameter eccentric fine-tuning boring tool, the middle of the tool holder is through, and the inside of the boring bar is provided with a liquid inlet channel, one end of which is inclined toward the blade.

[0011] According to the integrated small-diameter eccentric fine-tuning boring tool, the tool holder, eccentric bushing, boring bar, taper positioning hole and directional pin are all made of high-strength alloy tool steel.

[0012] According to the integrated small-diameter eccentric fine-tuning boring tool, the fastening screw is a GB standard taper screw.

[0013] The above-mentioned solution has the following advantages: Compared with the tool holder + separate adjustable fine boring tool, the effective machining depth of this integrated small-diameter eccentric fine boring tool can be used for boring small-diameter deep holes (hole depth greater than 3 times the diameter). Compared with conventional integrated fine boring tools, the overall size is smaller due to the use of eccentric motion to adjust the machining range, thus widening the machining range. Furthermore, one end of the eccentric adjustable boring tool can be mounted on the spindle tool holder of a CNC machine tool. After rough boring the inner hole of the workpiece, fine adjustment can be made by means of a "scale pointer" according to the boring size to achieve high-precision small deep hole machining.

[0014] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments; Figure 1 This is a schematic diagram of the structure of the integrated small-diameter eccentric fine-tuning boring tool of this utility model; Figure 2 This is a front view of the integrated small-diameter eccentric fine-tuning boring tool of this utility model; Figure 3 Side view of the integrated small-diameter eccentric fine-tuning boring tool of this utility model. Figure 1 ; Figure 4 Side view of the integrated small-diameter eccentric fine-tuning boring tool of this utility model. Figure 2 ; Figure 5 for Figure 4 A partial sectional view of the middle structure; Figure 6 This is a cross-sectional view of the boring bar in the integrated small-diameter eccentric fine-tuning boring tool of this utility model.

[0016] Legend: 1. Tool holder; 2. Eccentric bushing; 3. Boring bar; 4. Cutting tool; 5. Fastening screw; 6. Tapered positioning hole; 7. Limiting groove; 8. Rear end directional groove of the tool holder; 9. Liquid inlet channel; 10. Positive and negative scale lines; 11. Directional pin; 12. Scale lines. Detailed Implementation

[0017] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0018] Reference Figure 1 , Figure 2 , Figure 3 This utility model embodiment of an integrated small-diameter eccentric fine-tuning boring tool includes: a tool holder 1, an eccentric bushing 2 sleeved inside the tool holder 1, a boring bar 3 sleeved inside the eccentric bushing 2, and a cutting tool 4 fixedly connected to one end of the boring bar 3 outside the eccentric bushing 2 by a Torx screw. The tool holder 1 has an HSKA63 interface, and the Torx screw is made of high-strength alloy tool steel. By rotating the eccentric bushing 2, the radial position of the boring tool tip is changed by its eccentricity (the offset between the axis and the outer circle), thereby achieving fine adjustment of the hole diameter machining size with an accuracy of 0.01mm. Reference Figure 3 , Figure 4 The tool holder 1 has a mounting hole on its outer side, and a fastening screw 5 is threaded into the mounting hole. The boring bar 3 has a tapered positioning hole 6 on its outer side, and the end of the fastening screw 5 is installed into the tapered positioning hole 6. Specifically, the fastening screw 5, together with the mounting hole, firmly fixes the tool holder 1 to the machine tool or turret. Reference Figure 4 , Figure 5The boring bar 3 has a tool holder rear end directional groove 8 inside one end of the eccentric bushing 2. The tool holder 1 has a directional pin 11 inserted at the position directly opposite the boring bar 3. The directional pin 11 extends into the tool holder rear end directional groove 8. Specifically, the tool holder rear end directional groove 8 is used to limit the rotation and axial movement of the eccentric bushing 2 to ensure adjustment accuracy and machining stability.

[0019] Reference Figure 4 , Figure 5 The side wall of the eccentric bushing 2 is provided with a limiting groove 7, and the tapered positioning hole 6 passes through the limiting groove 7. Specifically, it is convenient to lock the eccentric bushing 2 in the working position through the limiting groove 7 and the tapered positioning hole 6 to prevent vibration and displacement.

[0020] Reference Figure 1 The eccentric bushing 2 has positive and negative scale lines 10 on the side facing the blade 4, and the tool holder 1 has scale lines 12 on the side facing the blade 4. One end of the scale line 12 is aligned with the positive and negative scale lines 10. Specifically, the positive and negative scale lines 10 on the eccentric bushing 2 are used to clarify the direction of size increase or decrease and to quickly locate the target machining hole diameter. The scale lines 12 on the tool holder 1 are used to assist in tool installation, positioning, and angle calibration to ensure machining consistency and accuracy.

[0021] Reference Figure 1 The eccentric bushing 2 has an adjustment end face on the side facing the blade 4. The adjustment end face is located outside the positive and negative scale lines 10. Specifically, by rotating the adjustment end face, the eccentricity of the eccentric bushing 2 can be changed, thereby adjusting the relative position or gap between the shaft and other components.

[0022] Reference Figure 1 A stop plate is provided on the outer side of the boring bar 3. The boring bar 3 extends into the inner side of the eccentric bushing 2 on the side of the stop plate away from the cutting tool 4. Specifically, the stop plate is used to limit the boring bar 3. The boring bar 3 extends into the inner side of the eccentric bushing 2 by means of the adjustment function of the eccentric bushing 2 to precisely control the radial feed of the boring tool, thereby realizing the fine adjustment and precise control of the boring diameter.

[0023] Reference Figure 4 The tool holder 1 is open in the middle, and the boring bar 3 is provided with a liquid inlet channel 9. One end of the liquid inlet channel 9 is inclined towards the cutting tool 4. The liquid inlet channel 9 is used to transport coolant or flushing fluid, so as to ensure the accuracy, efficiency and tool life of boring.

[0024] The tool holder 1, eccentric bushing 2, boring bar 3, tapered positioning hole 6, and directional pin 11 are all made of high-strength alloy tool steel.

[0025] Fastening screw 5 should be a GB standard taper screw.

[0026] Working principle: Using an external wrench to turn the hexagon on the eccentric bushing 2 causes the eccentric bushing 2 to rotate within the fixed hole, which drives the boring bar 3 to perform cam motion to adjust the boring range of the cutting tool 4.

[0027] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. An integrated small-diameter eccentric fine-tuning boring tool, including: The tool holder (1) is characterized in that an eccentric bushing (2) is provided inside the tool holder (1), a boring bar (3) is provided on the inner side of the eccentric bushing (2), and a cutting blade (4) is fixedly connected to one end of the boring bar (3) on the outer side of the eccentric bushing (2) by a Torx screw. The tool holder (1) has a mounting hole on its outer side, and a fastening screw (5) is threaded into the mounting hole. The boring bar (3) has a tapered positioning hole (6) on its outer side, and the end of the fastening screw (5) is installed into the tapered positioning hole (6). The boring bar (3) has a tool bar rear end orientation groove (8) inside one end of the eccentric bushing (2), and the tool holder (1) has an orientation pin (11) inserted in the position directly opposite the boring bar (3), and the orientation pin (11) extends into the tool bar rear end orientation groove (8).

2. The integrated small-diameter eccentric fine-tuning boring tool according to claim 1, characterized in that, The side wall of the eccentric bushing (2) is provided with a limiting groove (7), and the tapered positioning hole (6) passes through the limiting groove (7).

3. The integrated small-diameter eccentric fine-tuning boring tool according to claim 1, characterized in that, The eccentric bushing (2) has positive and negative scale lines (10) on one side facing the blade (4), and the handle (1) has scale lines (12) on one side facing the blade (4), with one end of the scale line (12) facing the positive and negative scale lines (10).

4. The integrated small-diameter eccentric fine-tuning boring tool according to claim 3, characterized in that, The eccentric bushing (2) has an adjustment end face on one side facing the blade (4), and the adjustment end face is located outside the positive and negative scale lines (10).

5. The integrated small-diameter eccentric fine-tuning boring tool according to claim 4, characterized in that, A stop plate is provided on the outer side of the boring bar (3), and the boring bar (3) extends into the inner side of the eccentric bushing (2) on the side of the stop plate away from the cutting tool (4).

6. The integrated small-diameter eccentric fine-tuning boring tool according to claim 1, characterized in that, The middle of the handle (1) is through, and the inside of the boring bar (3) is provided with a liquid inlet channel (9), one end of which is inclined toward the blade (4).

7. The integrated small-diameter eccentric fine-tuning boring tool according to claim 1, characterized in that, The tool holder (1), eccentric bushing (2), boring bar (3), tapered positioning hole (6) and directional pin (11) are all made of high-strength alloy tool steel.

8. The integrated small-diameter eccentric fine-tuning boring tool according to claim 1, characterized in that, The fastening screw (5) is a GB standard tapered screw.

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