As the saying goes, "Don't fight an unprepared battle", how do you answer the interviewer when interviewing CNC programming? During the interview with
CNC engineers, the interviewer of
interviewer asked: What are the technological advantages of the machining center? How to answer?
Job seekers answer:
The process advantages of the machining center are:
1. It can reduce the number of clamping of workpieces, eliminate positioning errors caused by multiple clamping, and improve processing accuracy. When the position accuracy requirements of each processing part of the part are high, machining center processing can process each part in one clamping, avoiding the positioning error caused by multiple clamping of the workpiece. It not only helps to ensure the position accuracy requirements of each processing part, but also reduces the auxiliary time for loading and unloading workpieces, saves a lot of special and general process equipment, and reduces production costs.
2. It can reduce the number of machine tools and reduce the operator accordingly, saving the workshop area occupied.
3. It can reduce the turnover and transportation workload, and shorten the production cycle of .
Interviewer asked: What are the process disadvantages of the machining center? How to answer?
Job seekers answer:
Processing center has the disadvantages of:
1. The technology is complex and has high requirements for use, maintenance and management.
2. Due to the use of automatic tool changing and automatic rotary workbench for multi-station processing, the horizontal machining center can only perform cantilever processing. Since auxiliary devices such as brackets cannot be installed during processing, tools with good rigidity should be used as much as possible to solve the vibration and stability of the tools. In addition, since the machining center realizes process or process steps through automatic tool change, the diameter, length and weight of the tool are generally not allowed to exceed the range specified in the machine tool manual due to the limitations of the tool magazine and robot .
33. The machining center has a large investment at one time, and other auxiliary devices need to be configured, such as tool pre-adjustment equipment, CNC tool system or three-coordinate measuring machine , etc. The machining labor cost of the machine tool is high. If the parts are selected improperly, the processing cost will be increased.
Interviewer asked: How to choose a machining center fixture? How to answer?
Job seeker answer:
machining center fixture is selected according to the characteristics and processing needs of the machining center machine tool.
Currently, commonly used types of fixtures include special fixtures, combined fixtures, adjustable fixtures, group fixtures and unified reference positioning and clamping systems for workpieces. When making a choice, you should consider various factors in a comprehensive way and choose a more economical and reasonable fixture form. The general order of selection of fixtures is: use general fixtures as much as possible in single-piece production; combine fixtures are preferred during mass production, secondly consider adjustable fixtures, and finally consider group fixtures and special fixtures; when the clamping accuracy requirements are very high, a unified reference positioning clamping system for workpieces can be configured. The high flexibility of the
machining center requires that its fixture is more compact and simpler than ordinary machine tools, the clamping action is faster and more accurate, minimize auxiliary time, more convenient, labor-saving and safe operation, and ensure sufficient rigidity and flexibility. Therefore, pneumatic and hydraulic clamping devices are often used.
Interviewer asked: How to use machining center fixtures reasonably? How to answer?
Job seekers answer:
Reasonable use of machining center fixtures:
1. In order to keep all the surfaces to be processed that need to be completed in this positioning and clamping are fully exposed, the fixtures should be opened as much as possible, and the space position of the clamping element can be low, and space must be left for the tool movement trajectory. The fixture cannot interfere with the tool trajectory of each work step. When there is no suitable clamping position outside the box, the clamping device can be arranged using the internal space.
2. Considering the minimum distance between the machine tool spindle and the work table and the clamping length of the tool, the installation position of the clamp on the machine tool work table should ensure that the machining content of the workpiece can be completed within the stroke range of the spindle.
3. When changing tools and exchanging workbenches, you cannot interfere with fixtures or workpieces.
Interviewer asked: What is the principle of choosing processing methods? How to answer?
Job seekers answer: The choice of processing method of
must ensure the processing accuracy and surface roughness requirements of the processing surface. Since there are generally many processing methods to obtain the same level of accuracy and surface roughness, when choosing, comprehensive consideration should be taken into account in terms of the shape, size and heat treatment requirements of the parts.
For example, for holes with IT7 level accuracy, boring, reaming, grinding and other processing methods can meet the accuracy requirements, but the holes on the box are generally boring or reaming, and grinding are not suitable. Generally, reaming is selected for small-sized box holes. When the hole diameter is large, boring should be selected. In addition, the requirements for production efficiency and economics, as well as the actual situation of the factory's production equipment, etc. should also be considered. The processing accuracy and surface roughness of commonly used processing methods can be found in the relevant process manual.
Currently, CNC programming related positions in the manufacturing industry are relatively short of, with salary generally ranging from 10,000+. Dear masters, please look for good jobs in CNC manufacturing.
Click the link to enter the CNC engineer area. High-paying positions are for you to choose from ☞https://scdata.job5156.com/t/2o
Job search is not only the boss picks and chooses workers, but also the workers will screen the company more and strive to go in both directions.
Original link: https://www.job5156.com/article/wz-1215/
Note: The article comes from Zhitong Talent Network workplace information, and reprinting requires authorization!
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