First, the application of thread milling With the fierce competition in the product market, our company's new products emerge one after another, have encountered some large parts of thread processing, traditional thread turning and taps, die can not meet the needs of production. The machining center has been widely used, and the three-axis linkage machine tool has been used to change the processing method of the thread and achieved good results.
Milling of threads has many advantages over traditional threading:
(1) If my company has a product that is more than 4m long (see Figure 1). The material is a titanium alloy, and the symmetry of the shape of the 2-M72×2-6H thread is required to be ≤0.3, and the conventional processing method cannot be realized at all. In our company, the use of a 4m gantry machining center for thread milling has been solved. It has great advantages in machining accuracy and machining efficiency and is not limited by the thread structure and thread rotation. A file with a threaded insert can process a variety of different internal and external threads, and there is no transition buckle or The undercut structure is difficult to machine with turning, taps and die, and CNC milling is easy to implement.
(2) Our company processes many large-diameter threads. Sandvik thread inserts are used on the threads of large products. One blade has 3 blades and can be reused 3 times, just like 2-M72×2-6H thread, one The blade can process dozens or even hundreds of products. Compared with taps or dies, the durability of the thread milling cutter is increased by several tens of times, and the tap is also used in a complete set with low durability, which is more difficult to realize for titanium alloy processing. Reduce production costs and increase production efficiency.
(3) The machining process of thread milling and boring is basically similar. During the machining process, the adjustment of the thread diameter is very convenient, the tap and the die can not be realized at all, and the same thread milling cutter can process many threads with different diameters and the like ( Because the blade is divided according to the pitch).
(4) The control of the starting angle of the thread, for turning, taps and dies are difficult to ensure that the starting angles of the threads of the different parts are the same. Milling requires only the same point to feed the different parts with the same starting angle. .
China Machinery Processing Network
Second, the example of thread milling: taking M72 × 2-6H thread as an example Workpiece material: titanium alloy; Tool: boring bar and Sandvik pitch 2 blade;
Spindle speed 2000r/min; Milling amount 0.06mm/z
Feeding speed 0.25mm/min; bottom hole size of thread φ69.835+0.375 0
Thread effective length 45mm; Milling method: Climb machining Center of the machining center: Fanuc0i-MA
Processing steps:
(1) Machining hole to thread bottom hole size φ69.835+0.375 0
(2) The thread milling cutter takes the spiral curve, performs circular interpolation motion in the X and Y directions around the thread axis, and moves linearly in the Z direction. Each thread runs one thread along the Z axis and moves one pitch along the Z direction. 3. Thread milling programming method:
T1
M6
G0G90G54X0Y0S400M3
G1G43H1Z50F1000M8
Z10F1000
#1=-45
Z#1
G41D1Y36F100
N10G91G3J-36Z2
#1=#1+2
IF[#1LT1]GOTO10
G1G40G90Y0F1000
Z10F1000
G55X0Y0
#1=-45
Z#1
G41D1Y36F100
N20G91G3J-36Z2
#1=#1+2
IF[#1LT1]GOTO20
G1G40G90Y0F1000
G0G49Z0M9
M5
M30
4. Summary: The flexibility of the machining center is fully reflected in the actual processing process.
1. In the actual machining, in the first piece of machining, first adjust the tool offset until the thread plug gauge checks the parts. In the future processing, the size of the first piece can be guaranteed to ensure the size is achieved once.
2. When performing the same size left-hand thread processing, you only need to change G3 to G2 in the program and G41 to G42.
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