BTA deep hole drilling composite structure damping guide sleeve

Abstract

The utility model provides a kind of BTA deep hole drilling composite structure shock-absorbing guide sleeve, comprising: guide sleeve (1), guide sleeve (2), shock-absorbing guide strip (3) and locking threaded sleeve (4);Guide sleeve (1) is nested in the front end of guide sleeve (2);The inner diameter of guide sleeve (1) is determined according to the size of deep hole drilling tool bit (4);Multiple slots are uniformly distributed on the hole wall of the inner hole of the end of guide sleeve (2), and shock-absorbing guide strip (3) is arranged in the slot;The diameter of the circle formed by the inner arc surface of shock-absorbing guide strip (3) is determined according to the diameter size of deep hole drilling tool bar (6);The inner hole aperture of the end of guide sleeve (2) is provided with thread, locking threaded sleeve (4) is connected with the inner hole aperture thread of the end of guide sleeve (2), and the movement of shock-absorbing guide strip (3) in the axial direction of guide sleeve (2) is locked. For preventing the hole position deviation condition caused by drill rod in deep hole machining process.

Description

Technical Field

[0001] This utility model belongs to the field of auxiliary devices for deep hole machining tools in mechanical processing, and relates to a BTA deep hole drilling composite structure shock-absorbing guide sleeve. Background Technology

[0002] Currently, guide sleeves used in BTA deep hole drilling are basically self-made cylindrical barrel-shaped guide sleeves based on the size of the part's hole diameter and the size of the cutting head.

[0003] Firstly, each guide sleeve can only process parts of the same specification and size, which means that they are basically dedicated guide sleeves, resulting in a large quantity and increased costs. Secondly, this traditional guide sleeve can only guide the cutting head of the tool and does not support or guide the tool holder. When machining small, high length-to-diameter ratio deep holes, it is easy to generate cutting vibration, causing machining deviation and making it difficult to guarantee the machining quality of the parts.

[0004] Therefore, when machining deep holes with a large aspect ratio, it is necessary to design a new type of guide sleeve that is easy to operate and designed for the BTA deep hole machining method to meet the technical requirements of deep hole machining. Utility Model Content

[0005] Purpose of the utility model: To provide a shock-absorbing guide sleeve with a BTA deep hole drilling composite structure to prevent the drill rod from shifting the hole position during deep hole machining.

[0006] Technical solution: This utility model provides a BTA deep hole drilling composite structure vibration damping guide sleeve, including: guide sleeve 1, guide sleeve 2, vibration damping guide strip 3 and locking threaded sleeve 4; The guide sleeve 1 is nested inside the front end of the guide sleeve 2; the inner diameter of the guide sleeve 1 is determined according to the size of the deep hole drilling head 4; Multiple grooves are evenly distributed around the circumference of the inner wall of the end of the guide sleeve 2, and shock-absorbing guide strips 3 are installed in the grooves; the diameter of the circle formed by fitting the inner arc surface of the shock-absorbing guide strip 3 is determined according to the diameter of the deep hole drilling tool rod 6. The inner hole at the end of the guide sleeve 2 is threaded, and the locking threaded sleeve 4 is threadedly connected to the inner hole at the end of the guide sleeve 2, which serves to lock the movement of the shock-absorbing guide strip 3 in the axial direction of the guide sleeve 2.

[0007] Optionally, the guide sleeve 1 and the guide sleeve 2 are clearance-fitted, with a clearance of 0.005-0.015 mm.

[0008] Optionally, when the guide sleeve 1 is embedded in the guide sleeve 2, the guide sleeve 1 is lower than the guide sleeve 2.

[0009] Optionally, the fit clearance between the shock-absorbing guide strip 3 and the groove is 0.02-0.04 mm.

[0010] Optionally, the deep hole drilling head 5 is fitted with the guide sleeve 1 with a fit clearance of 0.005-0.01 mm, ensuring that the deep hole drilling head 5 and the tool holder 6 can reciprocate within the guide sleeve 1.

[0011] Optionally, the shock-absorbing guide strip 3 is a bakelite guide strip. The deep hole drilling tool rod 6 and multiple shock-absorbing guide strips 3 form a concentric circle, which plays a shock-absorbing role when the deep hole drilling head 5 and the deep hole drilling tool rod 6 rotate.

[0012] Optionally, the number of locking shock-absorbing guide strips 3 is 3.

[0013] Optionally, the slot can be a trapezoidal slot or a rectangular slot; The contact surface between the locking and damping guide strip 3 and the deep hole drilling tool 6 is arc-shaped.

[0014] The beneficial effects of this application are as follows: For BTA deep hole machining, especially for deep holes with small length-to-diameter ratios, a composite structure vibration-damping guide sleeve for BTA deep hole drilling is designed, solving the problem of cutting vibration of the tool holder and significantly correcting straightness deviations in deep hole machining. The front end of the guide sleeve uses a replaceable tool head guide sleeve, which can be selected according to the size of the hole diameter of the workpiece and the diameter of the deep hole drilling tool. Different diameter guide sleeves can be designed, reducing the cost waste of using various dedicated guide sleeves and significantly lowering the production cost of deep hole machining. The rear end of the guide sleeve is equipped with three trapezoidal (or rectangular) bakelite guide strips, depending on the size of the deep hole drilling tool holder. Bakery is a universal and inexpensive material with good strength and vibration absorption, reducing the impact of cutting vibration generated during deep hole cutting, improving the machining quality of the parts, and meeting the requirements of machining accuracy, thus having practical application value. The guide sleeve is easy and quick to install and poses no safety risks during use. Since the front and rear guide sleeves and guide strips are replaceable, production costs are greatly reduced. Taking the drilling of a ￠24 hole with a wall thickness of 6mm and an aspect ratio of 70 as an example, without using this composite structure shock-absorbing guide sleeve, the drilling deviation is 1-2mm; after using this device, the drilling deviation is 0.3-0.6mm, which can meet the processing technical requirements and has a good corrective effect on the deviation of the hole. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model, which combines the BTA deep hole cutter head and the cutter shank. Figure 2 This is a schematic diagram of the overall structure of this utility model; Figure 3 This is a schematic cross-sectional view of the present invention. Figure 4 This is a schematic diagram of the combined structure of shock-absorbing guide strips and guide sleeves of different shapes used in this utility model; Explanation of reference numerals in the attached figures: 1-Guide sleeve, 2-Guide sleeve base, 3-Shock-absorbing guide strip, 4-Locking nut, 5-BTA cutter head, 6-BTA cutter bar. Detailed Implementation

[0016] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings: The present invention will be described in further detail with reference to specific embodiments, but this is not intended to limit the present invention.

[0017] like Figure 1 As shown in the figure, this embodiment provides a BTA deep hole drilling composite structure vibration damping guide sleeve, including: guide sleeve 1, guide sleeve 2, vibration damping guide strip 3, locking threaded sleeve 4, deep hole drilling head 5 and tool holder 6; Guide sleeve 1 and guide sleeve 2 are fitted with a clearance of 0.005-0.015 mm. When guide sleeve 1 is embedded in guide sleeve 2, guide sleeve 1 must be lower than guide sleeve 2. The shock-absorbing guide strip 3 is matched with three trapezoidal grooves on the inner wall of the end of the guide sleeve 2, with a matching clearance of 0.02-0.04 mm; The threaded connection between the locking threaded sleeve 4 and the inner hole at the end of the guide sleeve 2 serves to lock the movement of the shock-absorbing guide strip 3 in the axial direction of the guide sleeve 2.

[0018] The deep hole drilling head 5 is fitted with the guide sleeve 1 with a fit clearance of 0.005-0.01 mm, ensuring that the deep hole drilling head 5 and the tool holder 6 can reciprocate within the guide sleeve 1.

[0019] The deep hole drilling tool holder 6 and the three sets of shock-absorbing guide strips 3 form a concentric circle, which plays a shock-absorbing role when the deep hole drilling tool head and tool holder rotate.

[0020] This utility model discloses a composite structure vibration-damping guide sleeve for BTA deep hole drilling. During BTA deep hole drilling, the guide sleeve 1 is first embedded into the front end of the guide sleeve 2. Then, three sets of vibration-damping guide strips 3 are embedded into the guide sleeve 2 from the rear end. The vibration-damping guide strips 3 are locked by tightening the locking threaded sleeve 4 (or by using the countersunk screws on the outer surface of the rear end of the guide sleeve 2). Next, the guide sleeve 2 is connected to the spindle of the BTA deep hole drilling machine. The deep hole drilling tool 6 is moved and passed through the guide sleeve 2. Finally, the deep hole drilling head 5 is screwed onto the drilling tool 6, completing the installation of the entire guide sleeve 2.

[0021] This utility model discloses a composite structure vibration-damping guide sleeve for BTA deep hole drilling, comprising: a composite structure vibration-damping guide sleeve base connected to the spindle of a BTA deep hole drilling machine; the guide sleeve base is made of materials with high hardness and wear resistance, such as alloy steel or stainless steel. A replaceable tool head guide sleeve is provided at the front end of the guide sleeve, with a clearance fit between the guide sleeve and the guide sleeve. The guide sleeve is made of a material relatively softer than the guide sleeve base material, such as copper alloy or aluminum alloy. A replaceable tool shank vibration-damping guide strip is provided at the rear end of the guide sleeve. The tool shank vibration-damping guide strip is made of bakelite. Three vibration-damping guide strips are fitted to the guide sleeve base via trapezoidal keyways, and the axial movement of the tool shank vibration-damping guide strips is restricted by tightening with nuts at the end of the guide sleeve base. The tool head guide sleeve and the tool shank vibration-damping guide strip are replaced as needed according to the size of the BTA tool head and the tool shank.

[0022] The present invention has been described in detail with reference to the above embodiments. Those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific embodiments of the present invention without departing from the spirit and scope of the present invention, and such modifications or equivalent substitutions should be covered within the scope of the claims.

Claims

1. A shock-absorbing guide sleeve for BTA deep hole drilling composite structure, characterized in that, include: Guide sleeve (1), guide sleeve (2), shock-absorbing guide strip (3) and locking threaded sleeve (4); The guide sleeve (1) is nested inside the front end of the guide sleeve (2); the inner diameter of the guide sleeve (1) is determined according to the size of the deep hole drilling head (5); Multiple grooves are evenly distributed around the inner wall of the end of the guide sleeve (2), and a shock-absorbing guide strip (3) is installed in the groove; the diameter of the circle formed by fitting the inner arc surface of the shock-absorbing guide strip (3) is determined according to the diameter of the deep hole drilling tool rod (6); The guide sleeve (2) has a threaded end, and the threaded sleeve (4) is threaded to the end of the guide sleeve (2), which locks the shock-absorbing guide strip (3) in the axial direction of the guide sleeve (2).

2. The shock-absorbing guide sleeve of the BTA deep hole drilling composite structure according to claim 1, characterized in that, The guide sleeve (1) and the guide sleeve (2) are fitted with a clearance of 0.005-0.015 mm.

3. The shock-absorbing guide sleeve of the BTA deep hole drilling composite structure according to claim 2, characterized in that, When the guide sleeve (1) is embedded in the guide sleeve (2), the guide sleeve (1) is lower than the guide sleeve (2).

4. The shock-absorbing guide sleeve of the BTA deep hole drilling composite structure according to claim 1, characterized in that, The gap between the shock-absorbing guide strip (3) and the groove is 0.02-0.04 mm.

5. The shock-absorbing guide sleeve of the BTA deep hole drilling composite structure according to claim 1, characterized in that, The deep hole drilling head (5) is fitted with the guide sleeve (1) with a fit clearance of 0.005-0.01 mm, ensuring that the deep hole drilling head (5) and the tool holder (6) can reciprocate within the guide sleeve (1).

6. The shock-absorbing guide sleeve of the BTA deep hole drilling composite structure according to claim 1, characterized in that, The shock-absorbing guide strip (3) is a bakelite guide strip. The deep hole drilling tool rod (6) and multiple shock-absorbing guide strips (3) form a concentric circle. When the deep hole drilling tool head (5) and the deep hole drilling tool rod (6) rotate, they play a shock-absorbing role.

7. The shock-absorbing guide sleeve of the BTA deep hole drilling composite structure according to claim 1, characterized in that, The number of locking shock-absorbing guide strips (3) is 3.

8. The shock-absorbing guide sleeve of the BTA deep hole drilling composite structure according to claim 1, characterized in that, The groove is a trapezoidal groove / rectangular groove; The contact surface between the locking shock-absorbing guide strip (3) and the deep hole drilling tool bar (6) is arc-shaped.

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