Elastic boring bar

Abstract

The invention discloses an elastic boring bar capable of realizing radial automatic adjustment of a boring cutter. The elastic boring bar comprises an elastic deforming body, an inclined block, a jacking rod component and a pulling rod, wherein the elastic deforming body is served as a boring bar main body; the inclined block is arranged in the elastic deforming body; four elastic wall structures functioned as hinges are formed on the middle part in the elastic deforming body; the inclined block is arranged in the front end of the elastic deforming body and is provided with upper and lower two inclined planes which are parallel to each other; the pulling rod is connected with the inclined block and is used for driving the inclined block to axially move together; and the jacking rod component is used for generating radial shifting when the inclined block is driven by the pulling rod to axially move together. The elastic boring bar according to the invention is capable of increasing the whole rigidity of the boring bar, realizing the bidirectional complementation of radial adjustment and correspondingly increasing the accuracy and reliability of the radial adjustment of the boring cutter.

Description

technical field [0001] The invention belongs to the field of machining tool accessories, and more specifically relates to an elastic boring bar capable of realizing automatic radial adjustment of a boring tool during the boring process. Background technique [0002] In mass production and manufacturing, high-precision boring is an important finishing method for holes and turning circles. However, due to the inevitable tool wear and other random factors, the machining accuracy will inevitably decrease, so the adjustment of the tool is inevitable; therefore, the boring processing technology with the function of automatic and precise micro-adjustment of the tool has become a guarantee and improvement of processing quality and efficiency. In addition, the interpolation machining of special-shaped holes also requires the tool to achieve a small amount of radial feed during the machining process. [0003] At present, the devices for realizing micro radial feed in boring mainly in...

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Problems solved by technology

However, many years of engineering applications and experiments have shown that: 1) once a large disturbance occurs in the cutting force during processing, it will bring large size and shape errors, so its rigidity needs to be further improved; 2) because the invention only One-way compensation (one-way radial micro-feed) can be realized, which limits the application range of this technology; 3) Since the rigidity of the elastic boring bar and the maximum compensation range are mutually restricted, for example, if the rigidity is required, the maximum compensation range is small , and vice versa, which also limits the application range of the boring bar; 4) The screw of the ejector bar assembly is assembled inside the deformable body, which limits the design space of the push rod, thereby reducing the strength and rigidity of the push rod; 5) the The connecting sleeve of the invented boring bar increases the axial length of the boring bar and adds a link between the elastic boring bar and the main shaft, thereby reducing the overall rigidity of the boring bar. In addition, the contact point between the connecting sleeve and the tie rod It is easy to wear and has a significant adverse effect on the accuracy and reliability of compensation, and needs to be replaced regularly

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