Precise boring cutter for machining inner contour of deep hole of bottle cavity

Abstract

The invention relates to a precision boring cutter for machining the inner contour of a deep hole of a bottle cavity. The precision boring cutter comprises a boring rod, a reducing structure and a pull rod. The pull rod penetrates through the boring rod and is connected with a transmission positioning block, the pull rod is connected with the transmission positioning block through a lead screw nut pair transmission system controlled by an external servo, the pull rod is driven to do axial linear telescopic motion, the pull rod transmits the axial motion to the mandrel through the pin, and the mandrel converts the axial telescopic motion into radial telescopic motion of the sliding block through the inclined face. Therefore, radial extension and retraction of the tool apron and the blade in the variable-diameter structure are realized. Meanwhile, the radial driving ratio of the reducing structure of the device is 2: 1, driving is accurate and reliable, the guiding blocks and the vibration reduction strips are arranged outside, the self-guiding and vibration suppression effects can be achieved, and the first sliding block guide rail, the second sliding block guide rail and the sliding block guide rail support are arranged inside, so that the requirement for the rigidity of bevel transmission of the reducing structure can be met. The device has the characteristics of reasonable structure, accuracy, reliability and the like, and can be widely used for processing various bottle cavity holes with complex internal profiles.

Description

technical field [0001] The invention belongs to the field of deep hole inner contour machining, in particular to a deep hole inner contour precision machining tool. Background technique [0002] There is a special kind of hole in the deep hole, which is called bottle cavity hole because of its complex internal contour and bottle-like contour. Cavity holes are widely found in parts with complex inner contours, such as aircraft landing gear, automobile engine block, and oil Christmas tree. The processing of these parts is usually realized by electrolytic machining and boring. Although electrolytic machining does not produce residual stress, work hardening, tool wear, etc., it is rarely used due to its low processing efficiency, high cost, and serious pollution. , so the boring process is widely used. [0003] In the boring process of bottle cavity holes, the tool overhang length is too long, the rigidity is reduced, and it is very easy to produce serious chatter and affect t...

AI Technical Summary

Problems solved by technology

[0003] In the boring process of bottle cavity holes, the overhang length of the tool is too long, the rigidity is reduced, and it is very easy to cause serious chatter and vibration, which affects the processing quality and so on.

At the same time, due to the inconsistency of the internal dimensions of the bottle cavity, there is a gradient in the internal contour. However, it is difficult for ordinary boring tools to achieve a complex internal contour due to the inability to achieve radial expansion or contraction of the cutter head or the lack of rigidity of the tool. The processing of the bottle cavity hole, such as the patent number: 201110151356.1, provides a kind of internal reaming tool based on blind deep hole continuous automatic chip removal, which specifically includes the following deficiencies:

[0004] a. The tool of this device is directly connected to the slider. When it is used in different processing environments, only the blade can be replaced, and the tooling part of the slider is only suitable for one type of blade. Random replacement of the blade may cause the blade and the slider Block incompatibility, which affects the processing quality;

[0005] b. This device does not have an independent slider guide rail. The slideway of the slider is directly set on the boring bar, and there is no groove on the slideway. The limit accuracy of the slider is not enough. When the slideway of the slider appears When there is a problem, the entire boring bar needs to be replaced, and the economic loss is large;

[0006] c. The bevel variable diameter structure of the device adopts a single row of inclined surfaces. During processing, the rigidity of the variable diameter structure is difficult to meet, and the bevel is easy to bend due to insufficient rigidity, which in turn affects the smoothness and smoothness of the radial expansion and contraction of the slider. precision;

[0007] d. The part of the mandrel of the device that is not in contact with the slider is fitted with other parts in the device on a plane or with a small mating area, so that the force received by the mandrel is more concentrated. At the same time, the existing inner contour processing device does not have the ability to slide Block guide rail support makes it difficult to meet the rigidity of the mandrel and slider;

[0008] e. Due to structural reasons, this device is only suitable for the processing of deep hole parts with a small length range, and its adaptability is weak; and in order to prevent the axial rotation of the tie rod, the device uses screws for circumferential limit, but the limit Accuracy is difficult to meet processing requirements

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