Vibration reduction boring rod with supporting rod capable of self-adapting to hole diameter

Abstract

The invention discloses a vibration reduction boring rod with a self-adaptive aperture supporting rod, and belongs to the technical field of machining. Comprising a boring rod body and a supporting rod, a cavity is formed in the position, close to a tool bit, of the boring rod body, four symmetrical grooves communicated with the cavity are formed in the cavity in the circumferential direction, the grooves and the cavity form an integrated hollowed-out part facilitating deslagging, the boring rod body is provided with a damping supporting device through the four grooves, and the damping supporting device is used for providing stable axial supporting for the boring rod. The damping supporting device comprises supporting rods, the front ends of the four supporting rods are movably connected with grooves in rod bodies through pin shafts and torsion springs, the torsion springs provide spring force for the supporting rods to be inclined and opened backwards all the time, and a plurality of universal balls arranged front and back are arranged on the outer sides of the supporting rods. When the boring rod feeds a workpiece, the universal balls make contact with the workpiece, the supporting rod provides stable circumferential supporting for the boring rod in the working process through the torsion spring, the supporting effect of the boring rod is improved, vibration is reduced, vibration in the part machining process is reduced, and the quality of the machined surface is improved.

Description

Technical Field

[0001] The invention relates to a vibration-damping boring bar with an adaptive aperture support rod, belonging to the technical field of mechanical processing. Background Art

[0002] In mechanical processing, boring bars are usually used for hole processing. During boring, the blade and the workpiece cut in and out periodically, and the fluctuation of cutting force causes the boring bar to vibrate. In deep hole boring, the boring bar has a large aspect ratio, low rigidity, and violent vibration, which makes the roughness of the machined surface fail to meet the requirements, affecting the processing quality of the hole. Existing vibration-damping boring bars with support structures require the position of the support structure to be manually adjusted before cutting, and the adaptability to the hole diameter is poor, which affects the boring work efficiency.

[0003] The prior art with the publication number CN106270591A discloses a passive vibration-damping boring bar, in which a cavity with an opening at the front end is arranged near the front end of the boring bar, and the opening end of the cavity is relatively sealed with the rear end of the cutter head. A plurality of vibration-absorbing units consisting of a slide seat, a plurality of elastic support elements and a vibration-absorbing block are arranged in the cavity. The slide seat is a hollow structure with openings at both ends, and the middle part of the vibration-absorbing block is connected to the inner wall of the slide seat through a plurality of elastic support elements. The slide seat can slide in the cavity. The vibration-absorbing block near the front end of the cavity is connected to the cutter head through a first compression spring, and the vibration-absorbing block near the rear end of the cavity is connected to the rear end surface of the cavity through a second compression spring. Two adjacent slide seats are connected through a connecting sleeve. When the boring bar is stationary, the two adjacent vibration-absorbing blocks are in close contact, and when the boring bar vibrates, sliding friction can occur between the two adjacent vibration-absorbing blocks. The boring bar can only be used for a specific hole according to the processed aperture, has poor versatility, and cannot provide direct support force for the boring bar. Summary of the invention

[0004] Technical problem: The purpose of the present invention is to solve the deficiencies of the prior art and to propose a support structure that can automatically adapt to the aperture size, thereby improving the support effect and working efficiency of the vibration-damping boring bar.

[0005] Technical solution: The present invention discloses a vibration-damping boring bar with an adaptive aperture support rod, the vibration-damping boring bar with an adaptive aperture support rod is characterized in that: it comprises a boring bar body, a cavity is arranged inside the boring bar body near the position of the cutter head, the cavity is symmetrically provided with four grooves connected to the cavity along the circumferential direction, the grooves and the cavity form an integral hollowing for slag discharge, the boring bar body is provided with a vibration-damping support device for providing stable axial support to the boring bar through the four grooves, the vibration-damping support device comprises four support rods matching the number of the grooves, the front ends of the four support rods are connected by The pin is movably connected to the groove in the rod body, and a torsion spring is arranged at the pin in the groove. The torsion spring provides spring force to keep the support rod tilted and stretched backward. A plurality of universal ball bearings arranged front to back are arranged on the outside of the support rod. When the boring bar feeds the workpiece, the universal ball bearings contact the workpiece in turn, and the inner wall of the workpiece generates force on the support rod. Under the action of the force, the support rod squeezes the torsion spring to close in the groove but always ensures that the universal ball bearings fit the inner wall of the workpiece being processed. The support rod provides stable circumferential support to the boring bar during work through the torsion spring, thereby improving the supporting effect of the boring bar and reducing vibration.

[0006] Furthermore, for different workpiece processing hole diameters, it is actually necessary to replace support rods of different lengths to adapt to the processing hole diameter size. Under the action of the torsion spring, the support rod is always close to the inner wall of the workpiece to provide stable circumferential support.

[0007] Furthermore, when the boring bar is working, the universal ball rolls against the inner wall of the workpiece, thereby avoiding sliding friction and reducing friction resistance.

[0008] Furthermore, when the support rod is boring a small-diameter deep hole, the support rod can be completely retracted into the groove. After retracting, the diameter of the boring bar is small, which expands the size range of the holes that can be bored by the boring bar.

[0009] Furthermore, there are five universal ball bearings on the support rod.

[0010] Furthermore, the outer wall of the support rod is an arc surface to reduce the friction that may come into contact with the workpiece and thus affect its feed.

[0011] Furthermore, the groove at the pin connection of the support rod is filled with grease to prevent dust and processing iron chips from falling in.

[0012] Beneficial effects: 1) For different inner diameters of the processed parts, the support rod can automatically adapt to the size of the hole diameter. Under the action of the torsion spring, the support rod can always be close to the inner wall of the workpiece, providing stable circumferential support. 2) When the boring bar feeds, the universal ball on the support rod contacts the workpiece in turn. The use of universal ball avoids sliding friction between the support rod and the workpiece, and the friction resistance is small. 3) When boring small-sized workpiece holes, the support rod can be completely retracted in the groove on the outside of the boring bar. After retracting, the diameter of the boring bar is small, which expands the size range of holes that can be bored by the boring bar. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of the structure of a vibration-damping boring bar with an adaptive aperture support rod in an embodiment of the present invention; Figure 2 Schematic diagram of the structure of the support rod in the embodiment of the present invention.

[0014] In the figure, 1 is workpiece; 2 is boring bar body; 3 is support rod; 31 is pin; 32 is torsion spring; 33 is universal ball bearing. Specific implementation plan

[0015] The present invention will be further described below in conjunction with the accompanying drawings.

[0016] like Figure 1 As shown, the present invention is a vibration-damping boring bar with an adaptive aperture support rod, including a boring bar body 2 and a support rod 3. The outer wall of the support rod 3 is an arc surface to reduce the friction that may contact the workpiece and affect its feed. The boring bar body 2 is provided with a cavity on the side close to the cutter head, and four symmetrical grooves are provided circumferentially along the boring bar body 2 in the cavity area. The four grooves and the cavity are integrated to form a hollow space for slag removal. If necessary, a slag removal channel for auxiliary slag removal can be provided in the boring bar body 2 behind the hollow space; four groups of support rods 3 are placed in the grooves and connected to the rod body 2 through a pin 31. A torsion spring 32 is provided at the pin 31 so that the support rod 3 is always subjected to the spring force that is stretched outward. The support rod 3 is provided with a group of universal balls 33, and a group of universal balls 33 has a total of 5, as shown in detail. Figure 2 shown.

[0017] When the boring bar is feeding, the universal ball 33 can contact the workpiece 1 in turn. Under the action of force, the support rod 3 is retracted inward and always fits the inner wall of the workpiece 1 to provide stable circumferential support for the boring bar, improve the support effect of the boring bar, and reduce vibration. When the boring bar is working, the universal ball 33 rolls against the inner wall of the workpiece 1 to avoid sliding friction and reduce friction resistance. When the support rod 3 is boring a small-diameter deep hole, the support rod 3 can be completely retracted in the groove. After retraction, the diameter of the boring bar is small, which expands the size range of the hole that the boring bar can bore.

[0018] When machining holes of different workpieces 1 , it is actually necessary to replace support rods of different lengths to adapt to the size of the machining hole. Under the action of the torsion spring 32 , the support rod 3 always clings to the inner wall of the workpiece 1 to provide stable circumferential support.

[0019] The connection between the groove and the pin shaft 31 of the support rod 3 is filled with grease to prevent dust and processing iron filings from falling in.

Claims

1. A vibration-damping boring bar with an adaptive aperture support rod, characterized in that: The invention comprises a boring bar body (2), wherein a cavity is provided inside the boring bar body (2) near the position of the cutter head, and the cavity is provided with four symmetrical grooves connected to the cavity along the circumferential direction, and the grooves and the cavity form an integral hollowing-out structure for facilitating slag discharge. The boring bar body (2) is provided with a shock-absorbing support device for providing stable axial support to the boring bar through the four grooves, and the shock-absorbing support device comprises four support rods (3) matching the number of the grooves, and the front ends of the four support rods (3) are movably connected to the grooves in the bar body (2) through pins (31), and a torsion spring (32) is provided at the pins (31) in the grooves, and the torsion spring (32) A spring force is provided to always tilt the support rod (3) backwards. A plurality of universal balls (33) are arranged front to back on the outer side of the support rod (3). When the boring bar feeds the workpiece (1), the universal balls (33) contact the workpiece (1) in sequence. The inner wall of the workpiece (1) generates a force on the support rod (3). Under the action of the force, the support rod (3) squeezes the torsion spring (32) to shrink into the groove, but always ensures that the universal balls (33) are in contact with the inner wall of the workpiece (1) being processed. The support rod (3) provides stable circumferential support to the boring bar during operation through the torsion spring (32), thereby improving the support effect of the boring bar and reducing vibration.

2. A vibration-damping boring bar with an adaptive aperture support rod according to claim 1, characterized in that: In view of the different workpiece (1) processing hole diameters, it is actually necessary to replace support rods of different lengths to adapt to the processing hole diameter size. Under the action of the torsion spring (32), the support rod (3) always clings to the inner wall of the workpiece (1) to provide stable circumferential support.

3. A vibration-damping boring bar with an adaptive aperture support rod according to claim 1, characterized in that: When the boring bar is working, the universal ball (33) rolls against the inner wall of the workpiece (1), thereby avoiding sliding friction and reducing friction resistance.

4. A vibration-damping boring bar with an adaptive aperture support rod according to claim 1, characterized in that: When the support rod (3) is boring a small-diameter deep hole, the support rod (3) can be completely retracted into the groove. After retracting, the diameter of the boring bar is small, thereby expanding the size range of the holes that can be bored by the boring bar.

5. A vibration-damping boring bar with an adaptive aperture support rod according to claim 1, characterized in that: There are five universal ball bearings (33) on the support rod (3).

6. A vibration-damping boring bar with an adaptive aperture support rod according to claim 1, characterized in that: The outer wall of the support rod (3) is an arc surface, so as to reduce the friction force that may come into contact with the workpiece and thus affect the feed.

7. A vibration-damping boring bar with an adaptive aperture support rod according to claim 1, characterized in that: The groove at the connection point of the pin shaft (31) of the support rod (3) is filled with grease to prevent dust and processing iron chips from falling in.

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