Parts "handle" CNC machining process analysis

 

  I often use ten units handle material LY12. Previously performed by horizontal lathe, now changed because the increase in the number of CNC lathe, CNC lathe using my department Jinan First Machine Tool Plant production CK6125 economical CNC lathe, flat bed, Vertical 4-position electric turret. Systems FANUC POWER MATE O.

 

    Here on the handle part of the processing technology, tool design. For further analysis.

 

    Since CNC lathe using a vertical four-station turret, one can only be installed four knives, and parts processing map l need at least six knives were cylindrical knife, center drill, drill, boring cutter, reamer knives and cutting knife. If you use the manual tailstock center hole drilling, and then manually twist drilling, reaming and finally manual, electric turret tops three knives were cylindrical cutter, boring knives and cutting knife handle so you can complete the process. But the efficiency is very low, because there is too much human intervention.

 

    Our goal is to achieve a fixture by the CNC lathe turning, drilling, reaming, boring and cutting processing. To achieve complete one clamping handle processing, it needs to be reduced to four knives knife 6 processing is completed.

 

  1. Processing route and tool design

 

  Processing line in Figure 2.

 

  After analysis, we will cylindrical knives and cutting knife combined into a knife, knives and center drill hole into a knife, so it is reduced to 4 6 knives knife it. Cylindrical knife and cut with a knife blade into the shape shown in Figure 3.

 

Figure 3 shows a material for the high-speed steel blade, blade width of 5mm, is divided into left and right cutting units, the cutting unit A corresponds to a left outer knife, and the outer face of the workpiece for turning, turning angle 920, respectively, based declination, vice declination is 15. , Car conical surface to prevent the knife minor flank interfere with the workpiece surface, while rake face to open a small increase in the volume flute rake angle, the cutting light, in a 0.2mm auxiliary cutting sharpening repair light blade. Right cutting unit B is equivalent to a cutting knife and a knife used to cut off the right side, left side while turning. Turning the main angle for the IOo, vice declination is 30. Left and right cutting units with a transition between the arc, the arc so that the cutting action is first cut off the handle, the left side of the handle. Bu. Does not have a big glitch. Diagram shown in Figure 4: B is an arc portion is formed of the material in the area of ​​the first cut off the handle, the back of the material-free zone and then subsequently removed.

 

Center drill and bore head into a knife tool design idea is based on the principle of Ni Zhifu drill design, that is what we call the drilling group. In the process, we found that drilling group aluminum and other nonferrous metals in the drill when the centering effect is good. {Without drilling center holes drilled holes directly with the group, but also a very good concentricity drilled holes. To further enhance the effect of our group centering drill carbide drill replaces ordinary high-speed steel drill bits, after the experiment to good effect. Figure 5 is a schematic view of the drill with the group. We base drilling is commonly used in aluminum drilling group, the material from the high-speed steel to carbide. .

 

  2. Tooling

 

  To achieve automatic drilling CNC lathes, drill was to design a fixture tooling. Design idea is a good Quartet milling cutter body, caught in the tool holder and make alignment. In the drill clamping jaw self-centering chuck, move the knife blade drilling and then reaming, this will ensure the jaw to the center and the center of the tool body bore concentricity requirements. Then the side of the cutter body center of hole drilled two M8 threaded bottom outlet, and the attack on the threads. Doing so mandrel bent shaft hole and the cutter body with the transition, a mandrel head car a taper shank drill chuck with B14, and then plug mandrel into the hole in the cutter body, through the side of the two M8 positioning the locking screw. Finally, the drill bit into the drill chuck can. Fixture structure and is shown in Figure 6.

 

    This drill larvae L tooling can be used repeatedly, and can be replaced with different specifications of the drill, very easy to replace. Installation must find positive, otherwise there will be tapered bore holes drilled phenomenon.

 

    This tooling Scope: center hole drilling, drilling, reaming, reaming, etc.,

 

    Since my unit used lathe FANUC - MATE 0 system, there is no loop through function (G71, G72, G73) and drilling cycle functions (G74), so in order to better meet this tooling drilling, reaming. We compiled a set of drill macro.

 

    Note: # 6 for each borehole depth, with instructions for K. Brace 18 is a processing position distance air travel distance, to use R for instructions.

 

# 9 of drilling feed rate, with F for instructions. # 20 is a bit quick exit after the pause time is mainly used to clean chips and cool the drill bit, with T for instructions.