Telescopic cutter of boring machine

Abstract

The utility model discloses a telescopic cutter of a boring machine, and relates to the technical field of deep hole machining equipment. The boring machine tool comprises a tool bar, a tool bit, a tool bar fixing assembly and a tool telescopic assembly, one end of the tool bar is connected with a boring machine tool table, a boss is arranged at the other end of the tool bar, a push rod hole is formed in the tool bar, and the tool telescopic assembly comprises a tool body, a tool bit, a gear, a vertical rack and a transverse rack. The transverse rack is pushed to drive the gear to rotate, the gear drives the vertical rack to move vertically, and therefore the cutter body is driven to move vertically, the cutter bar fixing assembly comprises an expansion core sleeve, a front cone and a rear cone, the two ends of the expansion core sleeve are located on the conical surfaces of the cones, and the front cone and the rear cone are connected through threads and provided with spring washers. According to the utility model, the problem of poor machining precision caused by vibration of the cutter bar and unstable fixation during deep hole machining is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of deep hole processing equipment, in particular to a retractable tool for a boring machine. Background Art

[0002] When using existing boring tools for deep hole processing, especially when deep hole expansion is required in valve seat holes, the tool head needs to be extended, so the tool shank diameter can only be smaller than the hole diameter for processing, resulting in a relatively large length-to-diameter ratio of the tool shank. During processing, the tool shank also needs to perform radial feed motion, and the front end of the tool shank cannot be supported. The tool shank is weak and will vibrate violently, failing to meet the designed dimensional accuracy and surface roughness requirements, or even failing to process.

[0003] The prior art discloses a Chinese utility model patent document with publication number CN204276930U, published on April 22, 2015. This utility model discloses a remote fine-adjustable deep-hole back-boring tool, comprising a tool arbor having a cylindrical cavity, a slide rod mounted within the cylindrical cavity, and a first through-hole and a second through-hole. A threaded block is rigidly connected to the slide rod within the first through-hole, and the threaded block is mated with a nut ring, with a graduated ring located at one end and a locking nut located at the other end. The second through-hole is slidably connected to a slider, which engages the slider via a helical gear. The slider is mounted on a tool head with a blade for both forward and reverse boring. A support sleeve is mounted on the slide shaft for support. This tool arbor has an aspect ratio of 15 to 20 times the diameter, providing good vibration resistance.

[0004] However, when the above technology is used, the support sleeve cannot be well fixed in the hole, resulting in high instability of the tool rod during processing. Utility Model Content

[0005] In order to solve the above technical problems, the utility model proposes a retractable tool for a boring machine. On the one hand, the utility model solves the problem of poor machining accuracy and instability caused by tool rod vibration during deep hole machining of valve seat holes in the prior art.

[0006] The utility model is realized by adopting the following technical solutions:

[0007] A retractable tool for a boring machine comprises a tool rod, a tool head and a tool rod fixing assembly, and also comprises a tool retractable assembly arranged in the tool rod, one end of the tool rod is connected to the boring machine tool table, and the other end is provided with a boss, a push rod hole is provided in the tool rod, and the tool retractable assembly comprises a tool body, a tool head, a gear arranged in the tool body, and a vertical rack and a horizontal rack meshed with the gear, the vertical rack is fixed in the tool body, a tool retractable hole is provided on the tool rod, the tool body is arranged in the tool retractable hole, a push rod is provided in the push rod hole, one end of the push rod is fixedly connected to the horizontal rack, and the other end is connected to the boring machine, and the push rod moves The movement drives the horizontal rack to move, thereby driving the gear to rotate. The rotation of the gear drives the vertical rack to move vertically up and down, thereby driving the cutter body to move up and down. The tool rod fixing assembly includes a core expansion sleeve, a front cone and a rear cone that are connected as a whole by threads. The core expansion sleeve has several open grooves milled on the circumference. The front cone and the rear cone are threaded together. The core expansion sleeve is arranged on the front cone and the rear cone, and the two ends of the core expansion sleeve are located on the conical surfaces of the front cone and the rear cone. The front cone and the rear cone are both provided with a through hole that matches the outer diameter of the tool rod boss, and a spring washer is provided at the threaded connection between the front cone and the rear cone.

[0008] A spring is provided at one end of the cross rack away from the push rod, and the spring is used to provide elastic restoring force to restore the cross rack to its initial position when the push rod is released, while ensuring that when the push rod breaks, the cross rack will not continue to move forward due to inertia, causing the cutter body to continue to move downward, thereby ensuring the stability and accuracy of the tool during use.

[0009] The cone angles of the front cone and the rear cone are 10°-75° to meet the clamping requirements of different applications.

[0010] The top of the front cone is provided with a cross groove for accurately obtaining the expansion size of the expansion sleeve according to the rotation angle.

[0011] A sealing ring is provided between the cutter body and the cutter bar to prevent chips, coolant or other contaminants from entering the interior of the cutter bar.

[0012] The length of the transverse rack is greater than the diameter of the tool telescopic hole to ensure that the motion can be effectively transmitted during the tool telescopic process.

[0013] The push rod hole and the knife rod are coaxially arranged.

[0014] The tool telescopic hole and the push rod hole are perpendicular to each other.

[0015] The cutter head is fixed on the cutter body by a locking screw.

[0016] The surface of the cutter head is provided with a wear-resistant or corrosion-resistant coating.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. In the present invention, a connecting rod and a transverse rack are provided in the cutter bar. The connecting rod is connected to the transverse rack at one end, the transverse rack is connected to the gear in the cutter body, and the other end of the transverse rack is connected to the cutter body. The gear is connected to the vertical rack in the cutter body. The transverse rack drives the transverse rack to reciprocate horizontally under the movement of the connecting rod. Under the meshing action of the transverse rack, the gear rotates clockwise or counterclockwise. When the gear rotates, it drives several vertical racks to move vertically up and down. The cutter head is hidden in the cutter bar, and the cutter bar does not need to move radially, which nearly doubles the strength of the cutter bar. At the same time, the meshing of the gear and the rack provides a smooth and precise transmission. The dynamic mode reduces the vibration and impact of mechanical parts as well as unnecessary friction and resistance, ensuring the smooth extension and retraction of the tool; and a tool bar fixing assembly is provided at the front end of the tool bar, which enables the tool bar to be steadily fixed in the hole to be processed through the expansion of the expansion sleeve, and the stability of the tool bar is guaranteed during processing, which can meet the designed dimensional accuracy and surface roughness requirements. At the same time, a spring washer is provided between the front cone and the rear cone, which is compressed when the thread is connected, generating a reaction force to resist loosening, thereby preventing the loosening of the thread during the processing of the valve seat hole, resulting in unstable fixation of the tool bar, thereby causing major errors in processing.

[0019] 2. This utility model incorporates a spring at the end of the horizontal rack away from the push rod, providing an elastic restoring force that ensures the tool quickly returns to its initial position when the push rod is released. Furthermore, the spring prevents the horizontal rack from continuing to move if the push rod breaks, ensuring the stability and accuracy of the tool body and reducing potential errors caused by inertia.

[0020] 3. In the present invention, the cone angle range of the front cone and the rear cone is 10°-75° to meet the clamping requirements of different applications. By setting the appropriate cone angle, it is ensured that the tool arbor can provide sufficient clamping force during the fixing process, thereby enhancing the stability and safety of the tool; at the same time, the cross groove on the top of the front cone can be used to accurately adjust the expansion size of the core expansion sleeve. The size of the core expansion sleeve can be accurately controlled according to the needs of specific applications, thereby achieving more accurate clamping and fixing effects.

[0021] 4. In the present invention, a sealing ring is provided between the cutter body and the cutter bar to prevent chips and other contaminants from entering the cutter body or the cutter bar, thereby improving the service life and reliability of the cutter and reducing malfunctions or wear caused by contaminants entering the inside.

[0022] 5. In the present invention, the length of the transverse rack is greater than the diameter of the tool telescopic hole, ensuring that the motion can be effectively transmitted during the tool telescopic process. The rack can stably transmit the motion during the entire telescopic process, thereby improving the working accuracy of the tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, wherein:

[0024] Figure 1 It is a cross-sectional view of the utility model;

[0025] Figure 2 This is a schematic diagram of the expansion sleeve of the utility model;

[0026] Figure 3 This is a cross-sectional view of the expansion sleeve of the utility model;

[0027] Figure 4 This is a cross-sectional view of the telescopic tool assembly of the utility model;

[0028] Markings in the figure:

[0029] 1. Tool bar, 2. Tool body, 3. Vertical rack, 4. Gear, 5. Tool head, 6. Expansion sleeve, 7. Blade, 8. Horizontal rack, 9. Push rod, 10. Front cone, 11. Rear cone, 12. Spring washer, 13. Open slot, 14. Cross slot. DETAILED DESCRIPTION

[0030] Example 1

[0031] This embodiment is the most basic embodiment. A retractable tool for a boring machine includes a tool bar 1, a tool head 5 and a tool bar fixing assembly, and also includes a tool retractable assembly arranged in the tool bar 1. One end of the tool bar 1 is connected to the boring machine tool table, and the other end is provided with a boss. A push rod 9 hole is provided in the tool bar 1. The tool retractable assembly includes a tool body 2, a tool head 5, a gear 4 provided in the tool body 2, and a vertical rack 3 and a horizontal rack 8 meshing with the gear 4. The vertical rack 3 is fixed in the tool body 2. A tool retractable hole is provided on the tool bar 1. The tool body 2 is provided in the tool retractable hole. A push rod 9 is provided in the push rod 9 hole. One end of the push rod 9 is fixedly connected to the horizontal rack 8, and the other end is connected to the boring machine. The push rod 9 pushes The horizontal rack 8 is driven to move forward, thereby driving the gear 4 to rotate counterclockwise. The counterclockwise rotation of the gear 4 drives the vertical rack 3 to move downward, thereby realizing the extension of the tool. The tool rod fixing assembly includes a core expansion sleeve 6, a front cone 10 and a rear cone 11 that are connected as a whole by threads. The core expansion sleeve 6 is milled with a plurality of open grooves 13 on the circumference. The front cone 10 is threadedly connected to the rear cone 11. The core expansion sleeve 6 is sleeved on the front cone 10 and the rear cone 11, and the two ends of the core expansion sleeve 6 are located at the conical surfaces of the front cone 10 and the rear cone 11. The front cone 10 and the rear cone 11 are both provided with a through hole that matches the outer diameter of the boss of the tool rod 1, and a spring washer is provided at the threaded connection between the front cone 10 and the rear cone 11.

[0032] In this embodiment, the cutter head 5 is hidden in the tool rod 1, and the tool rod 1 does not need to make radial movement, so that the strength of the tool rod 1 is nearly doubled. At the same time, the engagement of the gear 4 and the rack provides a smooth and precise transmission method, reduces the vibration and impact of mechanical parts as well as unnecessary friction and resistance, and ensures the smooth extension and retraction of the tool; and a tool rod fixing assembly is provided at the front end of the tool rod 1, which is expanded by the expansion sleeve 6 so that the tool rod 1 is stably fixed in the hole to be processed, and the stability of the tool rod 1 is guaranteed during processing, and the designed dimensional accuracy and surface roughness requirements can be achieved. At the same time, a spring washer is provided between the front cone 10 and the rear cone 11, which is compressed when the thread is connected, and generates a reaction force to resist loosening, thereby preventing the loosening of the thread during the processing of the valve seat hole from causing the tool rod 1 to be unstable, thereby causing major errors in processing.

[0033] Example 2

[0034] As another preferred embodiment of the present invention, this embodiment is based on the above-mentioned embodiment 1 and further supplements and elaborates on the technical solution of the present invention in detail. The push rod 9 retreats to drive the horizontal rack 8 to move backward, thereby driving the gear 4 to rotate clockwise. The clockwise rotation of the gear 4 drives the vertical rack 3 to move upward, thereby realizing the retraction of the tool.

[0035] Example 3

[0036] As another preferred embodiment of the present invention, this embodiment further supplements and elaborates on the technical solution of the present invention on the basis of the above-mentioned embodiments 1 and 2. A spring is provided at the end of the cross rack 8 away from the push rod 9. The spring is used to provide elastic restoring force to restore the cross rack 8 to its initial position when the push rod 9 is released, and at the same time ensure that when the push rod 9 breaks, the cross rack 8 will not continue to move forward due to inertia, causing the tool body 2 to continue to move downward, thereby ensuring the stability and accuracy of the tool during the processing of the valve seat hole.

[0037] Example 4

[0038] This embodiment is the best embodiment. This embodiment is a further detailed supplement and elaboration of the technical solution of the present invention based on the above-mentioned embodiments 1, 2 and 3. The cone angles of the front cone 10 and the rear cone 11 are 10°-75° to meet the clamping requirements of different applications; a cross groove 14 is provided on the top of the front cone 10 to accurately obtain the expanded size of the expansion sleeve 6 according to the rotation angle; through this design, the operator can accurately control the size of the expansion sleeve 6 according to the needs of the specific application, thereby achieving more accurate clamping and fixing effects; a sealing ring is provided between the tool body 2 and the tool rod 1 to prevent chips, coolant or other contamination The object enters the interior of the tool rod 1; the length of the cross rack 8 is greater than the aperture of the tool telescopic hole to ensure that the movement can be effectively transmitted during the tool telescopic process; the push rod 9 hole and the tool rod 1 are coaxially arranged to ensure that the movement direction of the push rod 9 is consistent with the axis of the tool rod 1, thereby improving the stability and accuracy of the tool and avoiding errors or tool offsets caused by axial misalignment; the tool telescopic hole and the push rod 9 hole are perpendicular to each other; the cutter head 5 is fixed to the tool body 2 by a locking screw, which ensures the stability of the cutter head 5 and can be replaced according to processing requirements; the surface of the cutter head 5 is provided with a wear-resistant or corrosion-resistant coating, which can effectively reduce the wear and corrosion of the cutter head 5 and ensure the service life of the tool.

Claims

1. A retractable tool for a boring machine, comprising a tool bar (1), a tool head (5) and a tool bar fixing assembly, characterized in that: The tool rod (1) further comprises a tool telescopic assembly arranged in the tool bar (1), wherein one end of the tool bar (1) is connected to the boring machine tool table, and the other end is provided with a boss, and a push rod (9) hole is provided in the tool bar (1), and the tool telescopic assembly comprises a tool body (2), a tool head (5), a gear (4) arranged in the tool body (2), and a vertical rack (3) and a horizontal rack (8) meshed with the gear (4), wherein the vertical rack (3) is fixed in the tool body (2), a tool telescopic hole is provided on the tool bar (1), and the tool body (2) is provided in the tool telescopic hole, and a push rod (9) is provided in the push rod (9) hole, wherein one end of the push rod (9) is fixedly connected to the horizontal rack (8), and the other end is connected to the boring machine, and the push rod (9) moves to drive the horizontal rack (8) to move, thereby driving the gear (4) to rotate. The gear (4) rotates to drive the vertical rack (3) to move vertically up and down, thereby driving the knife body (2) to move up and down. The knife rod fixing assembly includes a core expansion sleeve (6), a front cone (10) and a rear cone (11) connected as a whole by threads. The core expansion sleeve (6) is milled with a plurality of open grooves (13) on the circumference. The front cone (10) and the rear cone (11) are threadedly connected. The core expansion sleeve (6) is sleeved on the front cone (10) and the rear cone (11), and the two ends of the core expansion sleeve (6) are located on the conical surfaces of the front cone (10) and the rear cone (11). The front cone (10) and the rear cone (11) are both provided with a through hole matching the outer diameter of the boss of the knife rod (1). The threaded connection between the front cone (10) and the rear cone (11) is provided with a spring washer.

2. The retractable tool for a boring machine according to claim 1, characterized in that: A spring is provided at one end of the cross rack (8) away from the push rod (9), and the spring is used to provide elastic restoring force to restore the cross rack (8) to its initial position when the push rod (9) is released, while ensuring that when the push rod (9) breaks, the cross rack (8) will not continue to move forward due to inertia, causing the knife body (2) to continue to move downward, thereby ensuring the stability and accuracy of the tool during use.

3. A retractable tool for a boring machine according to claim 1 or 2, characterized in that: The cone angles of the front cone (10) and the rear cone (11) are 10°-75° to meet the clamping requirements of different applications.

4. The retractable tool for a boring machine according to claim 3, characterized in that: A cross groove (14) is provided on the top of the front cone (10) for accurately obtaining the expansion size of the expansion sleeve (6) according to the rotation angle.

5. The retractable tool for a boring machine according to claim 4, characterized in that: A sealing ring is provided between the tool body (2) and the tool rod (1) to prevent chips, coolant or contaminants from entering the interior of the tool rod (1).

6. The retractable tool for a boring machine according to claim 5, characterized in that: The length of the transverse rack (8) is greater than the diameter of the tool telescopic hole, so as to ensure that the motion can be effectively transmitted during the tool telescopic process.

7. The retractable tool for a boring machine according to claim 6, characterized in that: The push rod (9) hole and the knife rod (1) are coaxially arranged.

8. The retractable tool for a boring machine according to claim 7, characterized in that: The tool telescopic hole and the push rod (9) hole are perpendicular to each other.

9. The retractable tool for a boring machine according to claim 8, characterized in that: The cutter head (5) is fixed to the cutter body (2) via a locking screw.

10. The retractable tool for a boring machine according to claim 9, characterized in that: The surface of the cutter head (5) is provided with a wear-resistant or corrosion-resistant coating.

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