The key is the matching of machining process and machining center: the hardware of machining center is placed there, it is difficult to improve. You need to start with software. Tool matching, process line matching, cutting three parameters matching and so on. The core is process parameter optimization.
CNC machining quality control focus: surface roughness, size
To improve the quality of CNC gong processing:
1, machine tool maintenance: now the current tools with severe condition, except one high speed closed, other machine tool processing is too flat, interval between dao and volatility, feel is between 0.02 ~ 0.03, after processing and S = 8000 machine tools, the RPM S = 3500, spindle voice, machine tool vibration, 5 S greater than 3000 # big machine spindle fever, police not to walk. We all know that S does not turn high, the gong work piece is certainly not good. There is a step phenomenon of 0.03 ~ 0.05 in the machining contour feed and return tool mark.
2, tool quality to be improved: after quenching steel, currently there is no warehouse of any kind of knife grain, some of the best knife grain is to buy back first, and then to deal with, the effect is not very good, processing quenching material or not, processing part of the quenching material is "compromise" to complete.
3, the tool tip must be regularly replaced: the current end of the rope tip clamp phi 4 below the cutter, swing larger between 0.1 and 0.15, in the knife is quite difficult, the knife handle in the processing of the knife loose caused by the workpiece cutting.
4, six horizontal processing must be perpendicular to each other: if a piece of steel material is only horizontal parallel, the vertical degree does not meet the standard, the machine only school level, to add the assembly, the workpiece side stick die frame is not parallel, and then mistakenly for CNC machining plane to use shovel.
5, operator of the mold understanding is not enough: in the processing process, the processing of some shaped parting surface, penetration, contact wear, found that the knife wear is not important, plus some semi-new light after the tool, "feel" and continue to go light knife. Processing some high - core, cavity, careless measuring knife, resulting in excessive allowance or over - cutting workpiece.
6, there are reasons for the quota of time: the implementation of time quota, that is, more work more earn, often in the preparation of problems: lock plate bottom surface is not clean, school plane, plane uneven, about, resulting in the parting surface has high and low. In the light of the knife, careless test knife or knife, the general test knife to spend ten minutes enough to ten minutes. The key parts of the cutter can not reach the accurate effect, the light shape is too fast, causing the workpiece rough.
7, quality control half degree is not enough: after processing a piece of work, by the quality control inspection, but as the quality control staff do not understand the mold. Such as:
Pillow position, plane, crash, cavity should be strictly checked according to the requirements of the drawings combined with the mold structure, the qualified for qualified, not rework.
8, staff to be stable: now CNC machine has 60% of the new employees, these new employees are probation or probation period soon, the operation of our factory and mold quality requirements, as well as their own work level and experience, can not be compared with the old staff, so cycle, in the processing quality is difficult to do up.
9, programming quality: in the preparation of the knife road if the time is not enough, resulting in poor programming quality, there are some urgent workpieces, on the side of the machine, while writing the knife road, in general, the programmer should consider. Break the knife before inserting it. Combine equipment precision and tool quality, how much margin to put, enough or not enough, these are to be considered.
10, programming knife way still need to be improved; Writing knife road, the programmer is more conservative: on the one hand is afraid of using a knife, knife is easy to break, but broken to a fine; On the other hand, consideration is not comprehensive, such as larger area or more flat parting surface should use flying knife, processing should not be applied to the knife, because there are multiple flying knife, go parallel after one, not only the knife is not easy to damage, in cutting light degree or processing efficiency have certain advantages. And the ball knife only a point if the general wusteel knife as long as the processing time is a little long, the tip is easy to damage, although the workpiece processing is according to the program of light knife, but because of the tip wear, the margin is still some. For the flat and horizontal plane, it is the first choice to use the smooth surface of the broadsword.
11 ", the lack of practical equipment of measuring apparatus and instrument "against the knife, knife is measured with the school on the workbench, the cutting tool in the spindle slow turning, small paper pad behind, by size, the final effect is not ideal, and the knife is with a round iron pillars, knife knife this method have to be very careful, because spher mill a contact point, the flat knife four contact point, if the corners of a knife with high and low, a little careless, for on the plane, deep or shallow.
12, the mold design should be considered at the same time: the design at the same time, pillow, clamp, parting surface, sealant, deep cavity positioning. After the recesses in the back of the pillow are evacuated, the R Angle is set according to the depth, which is convenient for processing and does not require discharge. The position and root do not need to be inverted R Angle to avoid empty, convenient processing does not need to use a knife to clear. A parting surface, especially one that is very close to a flat parting surface, should not be regularly shaped according to the shape of the product. It should be considered whether the product is machined well at the same time before deciding whether to modify it. Because the plane only need to go a knife, and the arc will step to close to go, sealing glue in the space is small, it is difficult to cut, with a small knife will cause vibration knife cutting. For deep cavity positioning, it is necessary to consider the distance between the positioning position and the side of the cavity. At present, all the 3D drawings designed are zero-to-zero, only in the 2D standard tolerance. In fact, as long as some parts of the 3D are turned off, and the parts are completed and offset, CNC machining according to the drawing is better than marking the key parts with color now. Reason: the color, the CNC programming is necessarily will key areas will figure migration, some of the graphics is very difficult, when we amend the if on the tool offset, because a program is very smooth, but the middle place is different allowance, must be in the key place to knife knife knife road trip off, then go to fill a related allowance program key parts. In addition, if the programmer neglains to move the drawing during programming, it will lead to the failure of key places.
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Shenzhen Yuezhengjia Technology Co., Ltd.
Address: 2nd Floor, Building 1, Hehe Science and Technology Park, Daer Village, Guanlan Street, Baoan District, Shenzhen
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