CNC lathe processing plant threading tool
The method of turning and turning the triangular trapezoidal thread screw broadly similar, but because the high teeth deep, CNC lathe processing thread turning radial cutting force is large, so when turning pitch larger trapezoidal thread to use more crude tools and finishing tool respectively roughing and finishing.
Trapezoidal thread low-speed cutting and high-speed cutting of two ways.
(1) Low-speed cutting of high precision trapezoidal thread trapezoidal thread, as well as repair or single piece production, the normally low-speed cutting methods.
When cutting a trapezoidal thread pitch less than 4mm, and can be used only a turning tool, straight into law and a small amount of feed around, and then trimming tools in roughing, finishing forming.
When turning pitch larger trapezoidal thread, in order to avoid three cutting edges while participating in cutting and vibration, it should start with heavy tools, the use of the left and right to catch the knife feed way rental. CNC lathe processing plant to ensure a high degree of tooth type, then use fine tools for finishing molded straight into the law; when the pitch is large, the radial rake angle is zero, there is on both sides wear volume flute finishing knife, using the left and right to catch the knife method finishing trapezoidal thread.
(2) high-speed cutting trapezoid thread turning rigidity, when less precision trapezoidal thread, the thread can be used carbide tools, high-speed cutting.
With this cutting tools, since the three cutting edges also participate in cutting the ribbon will produce the chip flow, the operation is very safe.
For this purpose, it can be CNC lathe processing plant thread turning. This thread turning tool grind in front of two symmetrical arcs, the radial rake angle y. Increases. CNC lathe factory also makes two arcs rake-section 3. ~ 5. The roof structure.
Such tools can reduce the cutting force, increases the strength of tools, thereby reducing the cutting vibration. CNC lathe processing plant at the same time to form spherical chips, chip enable smooth.
(3) Operation Turning Points trapezoidal thread
1) Calculate the alveolar width, ie finishing tool tip wide trapezoidal thread form. Table 7-5w = 0.366P-0.536a coarse thread cutting tool edge width should be less than A, finishing to the left margin.
2) calculate the height of the tooth type, that type of tooth back engagement ^, according to the following table 7-5 ^ = 0. 5P ten Ⅱ Generally, when roughing, which should achieve the desired back engagement to ensure that the thread trail size, finishing, finishing only type of tooth sides.
3) finishing trapezoidal thread, the turning state must always remain sharp, cutting% (5 m / min, and raise a sufficient amount of cutting fluid.
4) When the low-speed finishing Chi thread, preferably an elastic holder to prevent vibration of the cutting bar or knife phenomenon.
5) CNC lathe processing plant is generally trapezoidal thread made of copper alloy and cast iron and other metal brittle, relatively easy to process. CNC lathe factory trapezoid thread turning at the inner diameter of the arbor should be limited conditions, try to increase the cross-section and shorten the length, generally used in the overall high-speed steel tools to enhance strength and stiffness.
6) After the car in a trapezoidal thread, the application of fine rasp or grinding stone dressing removal of sharp corners or burrs on the thread profile.
