The Common Trouble and Its Solution in Machining Thread of CNC Lathe （1）
Views : 379
Update time : 2017-01-04 12:04:51
Abstract: Threads are continuous protrusions and trenches formed on a cylindrical or conical surface along a helix with the same profile. Threaded parts are widely used in a variety of mechanical products. It is mainly used for connecting parts, fastening parts, transmission parts and measuring parts and so on. It is one of the commonly used machining methods to process threads on CNC lathes. CNC lathe processing thread to high precision machining, product uniformity, and processing advantages of a wide range of machining in the possession of more and more important position. In this paper, from the practical application, elaborated on the CNC lathe thread, due to machine, tool or operator reasons, in the cutting process prone to failure, and the solution.
Key words: CNC lathe thread processing fault diagnosis fault repair
With the development of science and technology, CNC lathe more and more popular in the CNC lathe turning thread in the mechanical processing is more and more use. CNC lathe to processing high precision, good product identity, processing a wide range, easy debugging (in particular, it can be precision machining in the general car more difficult to process some of the special surface parts) and other advantages in the mechanical processing in the possession of more and more important status. In CNC lathe turning thread on the common faults and solutions are:
Bar tack
1.1 The main reasons
(1) the tool’s front angle is too large, the front corner of the tool, tool X-axis screw gap; (2) the turning tool is installed too high or too low; (3) workpiece clamping is not strong; (4) turning tool wear is too large ; (5) cutting too much.
1.2 Solutions
(1) to reduce the turning angle, maintenance of machine tool to adjust the X-axis screw clearance, the use of CNC lathe automatic compensation of the screw gap compensation machine tool X-axis screw clearance;
(2) the tool is installed too high or too low: too high, then eat a knife to a certain depth, the tool after the knife face to withstand the workpiece, increasing friction, and even the top of the workpiece bending, Too low, the chip is not easy to discharge, turning the direction of the radial force is the center of the workpiece, coupled with the cross screw and nut clearance is too large, resulting in deepening the knife to keep the depth of automatic tendencies to lift the workpiece, At this point, should be promptly adjust the turning height, so that the tip and the workpiece axis high (can use tailstock top knife). In roughing and semi-finishing, the tip position is about 1% higher than the center of the workpiece (D is the workpiece diameter).
(3) workpiece clamping is not strong: the rigidity of the workpiece itself can not withstand the cutting force when turning, resulting in excessive deflection, changing the tool and the workpiece center height (the workpiece is elevated), the formation of cutting depth sudden increase , There Zakao, this time the workpiece should be firmly fixed, you can use tailstock top, etc., to increase the workpiece rigidity.
(4) Tool wear is too large: causing increased cutting force, the top bending parts, there Zaodao. At this point should be grinding tool to be.
(5) cutting output(mainly back to eat the amount of knife and cutting speed) is too large: According to the workpiece 5 lead size and workpiece rigidity to select a reasonable cutting parameters.
Key words: CNC lathe thread processing fault diagnosis fault repair
With the development of science and technology, CNC lathe more and more popular in the CNC lathe turning thread in the mechanical processing is more and more use. CNC lathe to processing high precision, good product identity, processing a wide range, easy debugging (in particular, it can be precision machining in the general car more difficult to process some of the special surface parts) and other advantages in the mechanical processing in the possession of more and more important status. In CNC lathe turning thread on the common faults and solutions are:
Bar tack
1.1 The main reasons
(1) the tool’s front angle is too large, the front corner of the tool, tool X-axis screw gap; (2) the turning tool is installed too high or too low; (3) workpiece clamping is not strong; (4) turning tool wear is too large ; (5) cutting too much.
1.2 Solutions
(1) to reduce the turning angle, maintenance of machine tool to adjust the X-axis screw clearance, the use of CNC lathe automatic compensation of the screw gap compensation machine tool X-axis screw clearance;
(2) the tool is installed too high or too low: too high, then eat a knife to a certain depth, the tool after the knife face to withstand the workpiece, increasing friction, and even the top of the workpiece bending, Too low, the chip is not easy to discharge, turning the direction of the radial force is the center of the workpiece, coupled with the cross screw and nut clearance is too large, resulting in deepening the knife to keep the depth of automatic tendencies to lift the workpiece, At this point, should be promptly adjust the turning height, so that the tip and the workpiece axis high (can use tailstock top knife). In roughing and semi-finishing, the tip position is about 1% higher than the center of the workpiece (D is the workpiece diameter).
(3) workpiece clamping is not strong: the rigidity of the workpiece itself can not withstand the cutting force when turning, resulting in excessive deflection, changing the tool and the workpiece center height (the workpiece is elevated), the formation of cutting depth sudden increase , There Zakao, this time the workpiece should be firmly fixed, you can use tailstock top, etc., to increase the workpiece rigidity.
(4) Tool wear is too large: causing increased cutting force, the top bending parts, there Zaodao. At this point should be grinding tool to be.
(5) cutting output(mainly back to eat the amount of knife and cutting speed) is too large: According to the workpiece 5 lead size and workpiece rigidity to select a reasonable cutting parameters.