A damping boring bar with self-adaptable aperture support rods

Abstract

The application discloses a damping boring bar with self-adaptable aperture support rods and belongs to the technical field of machining. The boring bar comprises a boring bar body and support rods. The interior of the boring bar body is provided with a cavity near the position of a tool head. Four symmetrical grooves in communication with the cavity are arranged along the circumference of the cavity. The grooves and the cavity form a hollow for conveniently discharging slag. The boring bar body is provided with damping support devices for providing stable axial support for the boring bar through the four grooves. The damping support devices comprise support rods. The front ends of the four support rods are movably connected with the grooves in the boring bar body through pin shafts and torsion springs. The torsion springs provide spring force for always tilting the support rods backward. The outer sides of the support rods are provided with a plurality of front and rear arranged universal ball bearings. When the boring bar feeds the workpiece, the universal ball bearings are in contact with the workpiece. The support rods provide stable circumferential support for the boring bar in operation through the torsion springs, improve the support effect of the boring bar, reduce vibration, reduce vibration in the machining of parts, and improve the quality of the machined surface.

Description

Technical Field

[0001] This invention relates to a vibration-damping boring bar with an adaptive bore diameter support rod, belonging to the technical field of machining. Background Technology

[0002] In machining, boring bars are commonly used for hole machining. During boring, the cutting tool and workpiece undergo periodic entry and exit, and fluctuations in cutting force cause the boring bar to vibrate. In deep hole boring, the large length-to-diameter ratio, low stiffness, and severe vibration of the boring bar result in insufficient surface roughness, affecting the hole machining quality. Existing vibration-damping boring bars with support structures require manual adjustment of the support structure's position before cutting, leading to poor adaptability to hole diameters and impacting boring efficiency.

[0003] Prior art, disclosed in CN106270591A, is a passive vibration-damping boring bar. Inside the boring bar, near its front end, there is a cavity with an open front end, the open end of which is sealed relative to the rear end of the cutting head. Multiple vibration-damping units, each consisting of a slide block, multiple elastic support elements, and vibration-damping blocks, are arranged within the cavity. The slide block is a hollow structure with open ends, and the middle of the vibration-damping block is connected to the inner wall of the slide block via multiple elastic support elements. The slide block can slide within the cavity. The vibration-damping block near the front end of the cavity is connected to the cutting head via a first compression spring, and the vibration-damping block near the rear end of the cavity is connected to the rear end face of the cavity via a second compression spring. Adjacent slide blocks are connected by a connecting sleeve. When the boring bar is stationary, adjacent vibration-damping blocks are in close contact; when the boring bar vibrates, sliding friction occurs between adjacent vibration-damping blocks. This boring bar is specific to the diameter of the hole being machined, lacking versatility, and cannot provide direct support force to the boring bar. Summary of the Invention

[0004] Technical problem: The purpose of this invention is to overcome the shortcomings of the prior art and 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: This invention discloses a vibration-damping boring bar with an adaptive bore diameter support rod. The vibration-damping boring bar with an adaptive bore diameter support rod is characterized by: comprising a boring bar body, an internal cavity near the cutter head, four symmetrical grooves communicating with the cavity along its circumference, the grooves and the cavity forming an integral perforation for easy slag removal; a vibration-damping support device for providing stable axial support to the boring bar is provided through the four grooves, the vibration-damping support device comprising four support rods matching the number of grooves, the front ends of the four support rods being connected via… The pin is movably connected to the groove in the rod body. A torsion spring is installed at the pin in the groove. The torsion spring provides the spring force that keeps the support rod tilting backward. Multiple universal balls are arranged in a front-to-back pattern on the outside of the support rod. When the boring bar feeds into the workpiece, the universal balls contact the workpiece in sequence. The inner wall of the workpiece exerts a force on the support rod. Under the action of the force, the support rod squeezes the torsion spring and retracts into the groove, but always ensures that the universal balls are in contact with the inner wall of the workpiece being machined. The support rod provides stable circumferential support to the boring bar during operation through the torsion spring, improving the support effect of the boring bar and reducing vibration.

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

[0007] Furthermore, when the boring bar is working, the universal ball bearings roll against the inner wall of the workpiece, avoiding sliding friction and resulting in low frictional 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 retraction, the diameter of the boring rod is small, which expands the range of hole sizes that the boring rod can bore.

[0009] Furthermore, there are a total of 5 omnidirectional 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 machining chips from falling in.

[0012] Beneficial effects: 1) The support rod can automatically adapt to different workpiece inner diameters. Under the action of the torsion spring, the support rod can always be in close contact with the inner wall of the workpiece, providing stable circumferential support. 2) When the boring bar feeds, the universal ball bearings on the support rod contact the workpiece sequentially. The use of universal ball bearings avoids sliding friction between the support rod and the workpiece, resulting in low frictional resistance. 3) When boring small-sized workpiece holes, the support rod can be completely retracted into the groove outside the boring bar. After retraction, the boring bar diameter is small, expanding the range of hole sizes that the boring bar can bore. Attached Figure Description

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

[0014] Figure 2 This is a schematic diagram of the support rod in an embodiment of the present invention.

[0015] In the diagram: 1-workpiece; 2-boring rod body; 3-support rod; 31-pin; 32-torsion spring; 33-universal ball bearing. Detailed Implementation Plan

[0016] The invention will now be further described with reference to the accompanying drawings.

[0017] like Figure 1 As shown, this invention is a vibration-damping boring bar with an adaptive aperture support rod, comprising a boring bar body 2 and support rods 3. The outer wall of the support rod 3 is an arc surface to reduce friction that may affect the feed of the workpiece. The boring bar body 2 has a cavity on the side near the tool head, and four symmetrical grooves are provided circumferentially along the cavity area of ​​the boring bar body 2. The four grooves and the cavity form a hollow space for easy slag removal. If necessary, a slag removal channel can also be provided behind the hollow space in the boring bar body 2 to assist in slag removal. The four sets of support rods 3 are placed in the grooves and connected to the rod body 2 by pins 31. A torsion spring 32 is provided at the pin 31 so that the support rod 3 is always subjected to an outward spring force. The support rod 3 is provided with a set of universal ball bearings 33, a set of five universal ball bearings 33, as shown in the figure. Figure 2 As shown.

[0018] When the boring bar feeds, the universal balls 33 sequentially contact the workpiece 1. Under the action of force, the support rod 3 retracts inward and always adheres to the inner wall of the workpiece 1, providing stable circumferential support for the boring bar, improving its support effect, and reducing vibration. When the boring bar is working, the universal balls 33 roll against the inner wall of the workpiece 1, avoiding sliding friction and reducing frictional resistance. When the support rod 3 is boring a small-diameter deep hole, it can be completely retracted into the groove. After retraction, the diameter of the boring bar is small, expanding the range of hole sizes that the boring bar can bore.

[0019] When machining holes for different workpieces 1, it is necessary to replace the 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 fits tightly against the inner wall of the workpiece 1, providing stable circumferential support.

[0020] The groove is filled with grease at the connection point between the pin 31 and the support rod 3 to prevent dust and machining chips from falling in.

Claims

1. A vibration-damping boring bar with self-adaptable aperture support rods, characterized by: The application relates to a boring bar body (2) which is internally provided with a cavity near a tool head position, the cavity is provided with four symmetrical grooves in communication with the cavity along the circumference, the grooves and the cavity form a hollow structure for conveniently discharging slag, the boring bar body (2) is provided with damping support devices for providing stable axial support for the boring bar through the four grooves, the damping support devices comprise four support rods (3) matched with the grooves in number, the front ends of the four support rods (3) are movably connected with the grooves in the bar body (2) through pin shafts (31), torsion springs (32) are arranged at the pin shafts (31) in the grooves, the torsion springs (32) provide spring force for always inclining and supporting the support rods (3) to the rear, a plurality of universal ball bearings (33) are arranged on the outer sides of the support rods (3) in front and back rows, when the boring bar cuts the workpiece (1), the universal ball bearings (33) are sequentially contacted with the workpiece (1), the inner wall of the workpiece (1) generates force on the support rods (3), the support rods (3) are pressed to the grooves under the action of the force but always ensure that the universal ball bearings (33) are attached to the inner wall of the machined workpiece (1), the support rods (3) provide stable circumferential support for the boring bar during work through the torsion springs (32), the support effect of the boring bar is improved, and vibration is reduced.

2. A vibration damping boring bar with self-adapting aperture support rods according to claim 1, characterized in that: Different support rods with different lengths are needed to be replaced to adapt to the machining hole diameter of different workpieces (1), the support rods (3) are always attached to the inner wall of the workpiece (1) under the action of the torsion springs (32) and provide stable circumferential support.

3. The vibration damping boring bar with self-adaptable aperture support rods of claim 1, wherein: When the boring bar works, the universal ball bearings (33) are rolled along the machined inner wall of the workpiece (1) and sliding friction is avoided, and the friction resistance is small.

4. The vibration damping boring bar with self-adaptable aperture support rods of claim 1, wherein: When the support rods (3) are used for boring small-diameter deep holes, the support rods (3) can be completely folded in the grooves, and the diameter of the boring bar is small after being folded, and the size range of the boring hole of the boring bar is enlarged.

5. The vibration damping boring bar with self-adapting aperture support rods of claim 1, wherein: There are five universal ball bearings (33) on the support rods (3).

6. The vibration damping boring bar with self-adapting aperture support rods of claim 1, wherein: The outer wall of the support rod (3) is a circular arc surface, so that the friction force which may be caused by the contact between the support rod (3) and the machined workpiece and affects the cutting of the boring bar is reduced.

7. The vibration damping boring bar with self-adapting aperture support rods of claim 1, wherein: The pin shaft (31) connecting position of the support rod (3) in the groove is filled with grease for preventing dust and machining iron filings from falling in.

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