機(jī)械設(shè)計(jì)畢業(yè) 英譯漢 論文

1、 The numerical control turning processing technology analysis I have seen 【 abstract 】 the use of CNC lathe aims to produce qualified parts, but qualified parts processing must rely on to formulate rational processing technology. This article in view of the current CNC lathe user process analysis to

2、 the unreasonable, comparing the analysis of the technology of about reasonable order problem. 【 keywords 】 CNC lathe machining process analysis turning process A, put forward The numerical control turning processing mainly include the process analysis, programming, with knife, outfit work-piece, of

3、 cutter, rough machining, half machining, finishing. And the numerical control turning process analysis is the numerical control turning processing of successful implementation of security. The numerical control turning processing technology is adopt CNC lathe processing components with the method a

4、nd the technical method using the sum. The main contents include the following aspects: (a) choose and determined parts the numerical control turning processing content; (2) the drawings for the numerical control turning processing technology analysis; (3) tools, jigs choice and adjusted design; (4)

5、 cutting dosages choice; (5) the design process, work steps; (6) process track calculation and optimization; (7) compiled nc machining technology documents. The author observed many CNC lathe technical workers, read quite a bit about the numerical control turning processing craft articles, discovere

6、d that most users select and determined by parts of the numerical control turning processing content, parts diagram analysis, fixtures and tools selection, cutting dosages choice and the division of process and develop processing order, processing trajectory calculation and optimization, compilation

7、 of nc machining process technical document order process analysis. But the author analyzes the above order after, detection a little wrong with that. Because the parts of the design process, work step process analysis this link is the most important part of it. The design of process, work steps can

8、 directly related to the processing that meets parts geometrical tolerance requirement parts. The design of process, work step unreasonable will directly cause parts of geometrical tolerance isnt up to scratch. In other words is the design of process, work step unreasonable directly lead to defectiv

9、e. 2 and problem analysis At present, numerical control lathe user operation level is very high, and can solve a lot of operational independence problem, but their theoretical level is not high, this is cause unreasonable process analysis the main reason for the order. Cause unreasonable process ana

10、lysis of order another reason for the enterprise is insufficient gauge equipment. Three, to solve problems Actually the technological analysis sequence analysis of unreasonable phenomenon of and reasons, then solve the problem is very easy. Will only work needs to be done for the analysis of the com

11、ponents order can be slightly do adjustment. The author thinks that the reasonable process analysis steps should be: (a) choose and determined parts the numerical control turning processing content; (2) the drawings for the numerical control turning processing technology analysis; (3) the design pro

12、cess, work steps; (4) tools, jigs choice and adjusted design; (5) cutting dosages choice; (6) process track calculation and optimization; (7) compiled nc machining technology documents. This paper focuses on two, three, four, five three steps in detail. (a) part drawing analysis Parts diagram analys

13、is is to develop the primary task of the numerical control turning process. Major dimensions method analysis, contour geometric factor analysis and precision and technical requirements analysis. Besides, it shall be parts structure and processing requirements analysis of rationality, choose process

14、benchmarks. 1. Choose a benchmark Parts on the graph dimensions method should be fit for CNC lathe machining characteristic, and on the same benchmark indicated size or given coordinates directly size. This mark methods to facilitate already programming and design standards, process datum, the measu

15、rement datum and programming the unity of origin. 2. Node coordinate calculation In manual programming, to calculate each node coordinates. When in automatic programming to parts all the geometric elements to outline a definition. 3. Precision and technical requirements analysis By processing compon

16、ents of the precision and technical analysis, is the important content of parts manufaturability analysis, only on the analysis of the precision and surface roughness parts to the right, on the basis of reasonable selection of processing methods, clamping mode, tools and cutting dosages, etc. (2) th

17、e design process, work steps 1. The principle of process division In numerical control lathe machining parts, common processes classification principles has two kinds. (1) keep precision principles. Process as much as possible, usually requires concentrated coarse, finishing usually in a fixture in

18、is complete. To reduce heat deformation and cutting force and the shapes of the deformation of the workpiece position accuracy, precision and surface roughness influence, the case shall then be thick, finish machining separately. (2) improve the production efficiency principle. Changing tools for re

19、ducing the number of changing tools, save time and improve production efficiency, should will need to use the same knife processing processing parts, change another again after completion of a knife, and other parts processing should reduce spare travel. 2. Sure processing order Formulate processing

20、 order is generally follow the following principles: (1) first rough then essence. According to rough turning half fine car sequence of pure car, gradually improve the machining accuracy. (2) first from near to far. On the cutting point from the parts processing, near to first from the cutting point

21、 processing after distant locations to shorten tool mobile distance, reduce spare travel time. In addition, first from near to far turning and beneficial to keep the rigid ware or semi-finished products, improve the cutting conditions. (3) internal and external crossover. Both the inner surface of t

22、he surface machined and parts of the industry should be advanced, rough machining appearance after the internal and external surface finishing. (4) projection planes to go first. Used for pure benchmark surface should be preferred processing out, the more precise the locating datum, the surface of t

23、he smaller clamping error. (3) fixtures and tools of choice 1. Clamping workpiece with positioning The numerical control turning processing as possible do a fixture can work out after all or most of the generation, try to reduce the machined surface, in order to improve the clamping number processin

24、g efficiency, guarantee the machining accuracy. For axial parts, usually in parts of YuanZhuMian be positioning itself outside the benchmark; For set of components, the benchmark for locating within hole. Nc lathe fixture in addition to using universal three claws self-centering chuck, four claw chu

25、ck, hydraulic, electric and pneumatic fixture outside, still have a variety of general good special jig. Actual operation should be reasonable choice. 2. Tools selection The service life of cutter except and tool materials related outside, still and tool diameter has the very big relations. Cutter d

26、iameter of the cutting dosages, able to bear is bigger also. So in parts, under the situation of shape allow using as far as possible big diameter of the tools is extend the life of cutter, effective measures to improve productivity. The numerical control turning commonly used tools typically divide

27、d into three groups. Namely lathe tools, circular arc form acuminate tools and molding tool. (4) cutting dosages choice The numerical control turning processing of cutting parameter optimizing quantity ap, including back spindle speed S (or cutting speed ) and feeding speed F (or feeding F). The cho

28、osing principle, cutting amount to reasonably select cutting dosages of improving nc lathe machining quality is very important. CNC lathe cutting dosages of determined according to the machine manual shall be considered as specified requirements, and tool durability to choose 。Also can be combined w

29、ith practical experience of analogism will decide. The general selection principle is: coarse car, the first consideration in the machine tool rigidity permission of choice as far as possible big back; optimizing the quantity ap Then select bigger feeding f; Finally the life of cutting tools allow a

30、gain according to determine an appropriate cutting speed . Optimizing the increased amount can reduce go back number, sword, increase feed processing efficiency for broken bits. Fine car, should focus on and consider how to ensure machining quality, and on this basis to improve manufacturing efficiency, therefore appropriate chooses smaller q