Rapid tool falling device for lathe

Abstract

The invention belongs to the technical field of cutting processing, and provides a rapid tool falling device for a lathe. The rapid tool falling device for the lathe comprises a base, a bottom plate, a front side plate, a rear side plate, a right side plate, a left side plate, a top fixing plate, a cutter bar, a cam lever, buffer springs, cylindrical guide rails, an adjusting nut, a first locking nut, a double-head stud, a second locking nut, pressure springs, a pressing plate, a pressing bolt and a pin shaft. The cutter bar is supported by the cam lever before a tool falls off; when the tool is needed to be lowered, the cam lever is forced to rotate by external force; when the cam lever rotates and passes through a certain position, the cutter bar instantly loses the supporting force; and under the strong pressures of the pressure springs, the cutter bar falls off at a large acceleration and is separated from a cutting area in a very short time, and the root of swarf is frozen. The rapid tool falling device is simple in structure, low in manufacturing cost, safe and convenient in operation, small in impact, capable of being repeatedly used and short in reset time; and when the tool falls off, a tool nose does not interfere with a workpiece, the root of the sward is not damaged, and the tool falling can be quickly and effectively realized.

Description

technical field [0001] The invention belongs to the technical field of cutting processing, and relates to a rapid tool drop device for a lathe. Background technique [0002] In order to study the cutting mechanism of the metal cutting process, various rapid tool drop mechanisms are widely used at home and abroad. Through the sudden tool drop during the cutting process, the deformation zone and chip root samples under the cutting conditions are obtained, and then different methods are used to analyze the cutting mechanism. It observes and establishes various physical models of chip formation to reveal the metal cutting mechanism and achieve the purpose of describing or predicting the cutting process. In order to make the chip root sample closer to the state during cutting, when designing the rapid tool drop device, the tool drop acceleration must be large enough, the separation time between the tool and the workpiece should be as short as possible, and the trajectory of the t...

AI Technical Summary

Problems solved by technology

The hammer-type rapid tool drop device vibrates greatly when the hand hammer is struck, which affects the cutting of the tool and has an impact on the accuracy of the machine tool; the gunshot type rapid tool drop device has a high operating risk factor; the explosive type rapid tool drop device has uneven acceleration. The initial acceleration value is smaller than the value that can be achieved later, and the operation is complicated. It is difficult to accurately calculate the amount of explosive charge and the shear force required to break the pin, and the operation is unsafe and noisy.

All of the above rapid tool drop devices need to cut the shear pins. At present, there are some patents that avoid damage to the shear pins through structural design. The form of tool drop is that the tool rotates, but the rotation axis of the tool is lower than the center level of turning, which makes the tool The movement track (arc) of the point-dropping tool intersects the outer circle of the workpiece, causing the tool tip to squeeze the workpiece, which has an adverse effect on the chip root and the tool tip, and if the spring compression is used as the power, the end face of the spring cannot be kept tight during the tool rotation. Sticking to the surface of the tool, the spring cannot always maintain good contact with the tool rod, resulting in an error in the acceleration of the tool drop

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