As a new type of holes treatment method, spiral holes strawberry technology has the advantages of a smooth cutting process, a small cutting force under the tool and a single treatment can meet the requirements of precision. This technology has become one of the hot spots and difficulties in processing materials in the country and abroad. So what is the difference between traditional technology of drilling and spiral grinding?
Traditional drilling process
Traditional drilling treatment mainly has the following characteristics:
First, in the traditional drilling process, the linear speed of the center of the spindle is 0, that is to say that the center of forest does not participate in the cut, and the material in the central area of the room Must be completely pressed and removed by the push down the drilling rig, the drilling bit carries the steering force Z is very large.
Second, the traditional drilling process is a continuous cutting process. The temperature to be accumulated continuously, which also accelerates the failure of the wear of the tool leads to a decrease in the quality of the processing surface.
Third, the method of eliminating flea of traditional drilling treatment is also one of the reasons for the failure of the tool. During the drilling process, the shavings are unloaded from the forest slit and the discharge speed of the chip is slow and the cutting heat is mainly removed by the chip. On the part and the tool, which will accelerate the failure of the wear of the tools.
In addition, when the chips are in direct contact with the surface of the treated hole, the treated surface will be striped. In general, the quality of traditional drilling treatment cannot meet the precision requirements of the aircraft manufacturing industry. From the point of view of technical feasibility and the economy, traditional drilling processes are no longer suitable for the manufacture of aircraft.
Spiral
Compared to traditional drilling, spiral milling holes adopt a completely different treatment method. The process of grinding helical hole is made up of two movements of the “rotation” of the spindle and the “revolution” of the spit around the center of the hole.
First of all, the trajectory of the tool center is a spiral rather than a straight line, that is to say that the center of the tool no longer coincides with the center of the treated hole, which is a process eccentric treatment. The diameter of the tool is different from the diameter of the hole, which breaks the limits of a tool dealing with the same diameter hole in traditional drilling technology, and performs the treatment of a series of diameter holes with a single tool of diameter. This not only improves the effectiveness of treatment, but also considerably reduces the number and type of tools stored and reduces treatment costs.
Second, the spiral holes grinding process is an intermittent grinding process, which is conducive to thermal dissipation of the tool, thus reducing the risk of wear and failure due to temperature accumulation. More importantly, compared to traditional drilling, the spiral grinding process has considerably improved the use of cooling fluid.
Third, the eccentric treatment method makes it possible to unload enough space for the hole slit fleas, and the chip elimination method is no longer the main factor affecting the quality of the hole. We can see that this technology has a large development space and good market prospects, but as a new treatment method, its treatment mechanism must be studied and discussed.
Advantages of spiral milling holes
1) Improve the quality of the treatment holes and the lifespan of the tools.
Compared to traditional drilling technology, spiral grinding holes considerably improve the quality and strength of holes; The chips are smooth.
The cutting capacity of traditional drilling tools is low, and it is easy to accumulate heat and wear quickly, so the lifespan of the tool is generally low;
2) Showing the development cycle and saving treatment costs.
When manufacturing aircraft or other heavy machines, the use of spiral holes strawberry technology considerably shortens the R&D cycle and will reduce costs.
Using helical milling technology, holes of different diameters and complex shape holes can be treated with the same tool. Due to its superiority of treatment methods, traditional counter-sample holes, bore and other works can be recorded. This means that the types of tools and numbers for machining holes will continue to decrease in the future. From the point of view of the entire development cycle, the use of spiral technology can reduce many processes (such as the elimination of blunder, bore, coolant and assembly after decomposition ), considerably shortening the treatment cycle.
3) highly automated.
Reaching higher automation is also a way to reduce treatment costs. This technology can only be applied to industrial robot devices due to the low milling force of the spiral milling process. Because industrial robot devices are relatively low and the axial force of traditional drilling holes is too high, traditional drilling cannot be used on such devices.
4) Promote the use of new materials.
This is an obvious development trend in using new materials in parts of planes, and new materials such as titanium alloys and composite materials have been widely used. The development and use of new materials require appropriate treatment technology support.
The spiral holes grinding process requires only one tool to treat holes of different diameters and high quality, which not only reduces the time for change of tools, but also saves the finishing process and improves considerably work efficiency. Given the advantages of spiral strawberry technology, large companies, in particular many companies in aviation and mold industries, have started to apply it to production practices. With the promotion and application of this technology, traditional drilling tools will be gradually eliminated and new holes milling devices will appear more and more in the machining workshops.
Daguang focuses on providing solutions such as precision CNC machining services (3-axis, 4-axis, 5-axis machining), CNC milling, 3D printing and rapid prototyping services.
