3、 Boring
1. tools used
The boring tool used in Guangdong machining factory is boring tool. There are many kinds of boring tools, which can be divided into single edge boring tools and double-edged boring tools according to the number of cutting edges. Single edge boring tools can be used for boring through holes, step holes and non-existent holes. The single edge boring head is similar to the lathe tool, and is clamped on the boring bar with screws. Screw 1 is used to adjust the size and screw 2 is used for locking. The rigidity of single edge boring tool is poor, which causes vibration easily during cutting, so the main deflection angle of boring tool is selected larger to reduce the small diameter force. When boring cast iron or fine boring, generally take κ r=90°; When boring steel parts holes, take κ R = 60 ° - 75 ° to improve the tool life. The size of boring hole diameter depends on adjusting the length of the tool, which is difficult to adjust and low efficiency, and can only be used in small batch production of single piece. But the single edge boring tool has simple structure and wide applicability, and it is suitable for rough and fine machining.
2. Process characteristics:
Guangdong machining factory from the tool structure characteristics, boring process is only a point cutting, so the cutting force on the tool wear is very large, so that the machining allowance must be small, otherwise it is very easy to damage the tool, the cutting process should be slow, otherwise the surface quality of the hole is not high, the roughness value increases. However, the biggest point in this process is that he can correct the verticality and roundness of the hole, and think that it is a point cutting which revolves around the axis. It brings advantages to the point cutting, and also brings the defects that cannot be ignored. That is, the influence of the tip on the quality of the inner wall of the hole during the process of tool withdrawal. Therefore, when using this process, the key consideration is how to feed the tool How to retreat the knife. Common boring and setting back knife, stop knife, lifting knife. Sometimes used for manual lifting of knives, etc.
4、 Milling - milling for hinge, milling for boring
1. introduction of tools and tools used:
The cutter used in Guangdong Machinery Factory is a vertical milling cutter. The vertical milling cutter is the most used milling cutter in the CNC machine tool, and its structure is very important. The cylindrical surface and end face of the end milling cutter have cutting edges. The edge and end edges can be cut simultaneously or separately. The cutting edge of the cylindrical surface of the vertical milling cutter is the main cutting edge, and the cutting edge on the section is the secondary cutting edge. The main cutting edge is generally spiral teeth, which can increase cutting stability and improve machining accuracy. Because there is no cutting edge at the center of the end face of the general vertical milling cutter, the end milling cutter can not be fed axially. The end face edge is mainly used to process the bottom plane with vertical side surface. In order to improve the chip curl, increase the chip space and prevent chip blockage, the number of teeth is less, and the arc radius of chip holding groove is larger. The number of teeth of the general rough tooth vertical milling cutter is 3-4 teeth, the number of teeth of the fine tooth vertical milling cutter is 5-8 teeth, the sleeve structure is 10-20 teeth, and the radius of the arc of the chip bearing groove r = 2-5mm. When the diameter of the end milling cutter is large, the unequal pitch structure can be made to enhance the seismic action and make the cutting process stable.
2. Process Overview
The processing technology of several holes in front of Guangdong machining plant is essentially a point position control of the machine tool. The machine tool only controls the action process, and does not control the accuracy. The accuracy is all reflected in the tool used. The accuracy of the tool is not up to the standard, and the good CNC machine tool can not add high-precision and high-quality holes. Moreover, there are many tools used, which brings inconvenience to the tool change. These are the shortcomings of the above-mentioned processing processes. Milling holes with end mills can make up for the defects of the above-mentioned processing. It can completely realize the milling instead of reaming, milling for boring, and the use of a general-purpose vertical milling cutter to complete the processing of a hole with high precision requirements, which fully displays the function of the digital control system and the accuracy is controlled by program. This is a new topic in the current numerical control application, It is to make full use of the numerical control equipment, combine with the numerical control program, simplify the process optimization processing process, and give full play to the advantages of the numerical control equipment. To complete the milling for hinge and milling for boring, it is necessary to compile the spiral processing procedure, control the spiral track of the vertical milling cutter, realize the control of two axis half and three axis linkage, and complete a hole processing with high quality and high precision requirements. The above several hole processing processes have advantages and disadvantages. However, there is no fixed process for the processing of a high-quality hole. It is not a traditional isolated drilling, reaming, boring and milling process. Sometimes, it may be necessary to use these processes in a complex and soft way. Sometimes, it may be necessary to use the existing conditions and use a certain process in a narrow sense in a local narrow sense, in the end, The process is also for quality service. Guangdong Machinery Factory should pay attention to improving efficiency on the basis of improving the quality of parts in practice. We also want to have better hole processing methods and hole processing technology, so that in the CNC machine tool equipment machinery manufacturing industry, in the real sense, improve the quality and efficiency of the processing products, make it play a greater efficiency, better for China's economic development services.