What are the requirements for precision part processing?

The precision electronic components are produced by intelligent machine tools controlled by a computer in a vacuum machine. How do precision parts be produced by precision parts processing? 首先，什么是精密零件加工，它其实是机械加工的一种，但是比较精密，对生产机械及流程要求比较高。随着工业化发展，精密机械加工分类越来越多，方向越来越细，越来越专业化。 所以未来精密机械越来越中综合化，它已经不是原来简单的机械加工了，它和高科技结合恰恰更好的发挥了它的作用，特别是加工的数字化使它的发展产生了质的飞跃。以后它将成为一门重要的科学，服务于工业发展。 任何一款机器设备都是有诸多不同的小零件组成的，每个零部件都扮演着至关重要的角色。零件需要组装，所以精密机械零部件加工厂家们就会针对这样的需求进行再加工，各种不同的零件加工之后我们可以得到更适合自己的零件，因此为了可以让这些产品更好地为自己而服务，所以很多人都少不了精密机械加工这一重要环节。 为了保证精密零件加工精度，粗、精机械零件加工最好分开进行。因为粗机械零件加工时，切削量大，工件所受切削力、夹紧力大，发热量多，以及机械零件加工表面有较显著的加工硬化现象，工件内部存在着较大的内应力，如果粗、粗机械零件加工连续进行，则精加工后的零件精度会因为应力的重新分布而很快丧失。 在精密零件加工工艺路线中，常安排有热处理工序。热处理工序位置的安排如下：为改善金属的切削加工性能，如退火、正火、调质等，一般安排在机械零件加工前进行。  

How to choose rough materials for precision machine parts manufacturing?

Engaged in mechanical processing, high-precision mechanical parts manufacturing, the selection of blanks, not only affects the economics of blank manufacturing, but also affects the economics of machining. Therefore, when determining the blank, it is necessary to consider the factors of thermal processing, but also the economic factors, but also the requirements of cold processing, in order to reduce the manufacturing cost of the parts from the determination of the blank. First, castings A blank of a part with a complicated shape should be manufactured by a casting method. At present, most castings are sand-cast, which is divided into wood mold manual molding and metal mold machine modeling. The wood mold manual molding casting has low precision, large processing surface allowance and low production efficiency, and is suitable for single-piece small batch production or casting of large parts. The metal mold machine has high molding productivity and high casting precision, but the equipment cost is high, and the weight of the casting is also limited, which is suitable for small and medium-sized castings produced in large quantities. Secondly, small castings with high quality requirements can be cast in special castings such as pressure casting, centrifugal manufacturing and investment casting. Second, forgings For steel parts with high mechanical strength, forging blanks are generally used. Forgings are available in both free forgings and die forgings. Free forging forgings can be obtained by hand forging (small blanks), mechanical hammer forging (medium blanks) or press forging (large blanks). The forgings have low precision, low productivity, large machining allowance, and the structure of the parts must be simple, suitable for single and small batch production, as well as manufacturing large forgings. The precision and surface quality of die forgings are better than free forgings, and the shape of the forgings can be more complicated, thus reducing the machining allowance. Die forging is much more efficient than free forging, but requires special equipment and forging dies, so it is suitable for large and medium-sized forgings with large batch sizes. Third, the profile Profiles can be divided into round steel, square steel, hexagonal steel, flat steel, angle steel, channel steel, I-beam and other special sections. There are two types of profiles: hot rolling and cold drawing. Hot-rolled profiles have low precision, but are inexpensive, and are used for blanks of general parts; cold-drawn profiles are small in size, high in precision, and easy to implement automatic feeding, but the price is higher, and it is mostly used for large batch production, suitable for automatic Machine tool processing. Fourth, welding parts The welded part is a joint obtained by a welding method. The advantage of welding is that the manufacturing is simple, the cycle is short, and the material is saved. The disadvantage is that the vibration resistance is poor, the deformation is large, and the mechanical processing can be performed after the aging treatment. In addition, there are stampings, cold extrusions, powder metallurgy and other blanks. Reasonable use of machinery to manufacture precision parts of blanks not only saves material costs, but also saves a lot of

Process analysis method for CNC machining parts

The numerical control machining process analysis of the parts is the most important part of the NC program. From the design of the drawings to the qualified delivery of the finished products, it is necessary to consider not only the preparation of the NC program, but also the influence of various problems during processing. So before starting programming, you must analyze the design drawings and technical requirements in detail to get the best processing solution. First, the original data required for the development of CNC machining route 1. Part design drawings, technical materials, and assembly drawings of the products. 2. Production batch of parts. 3. Relevant technical standards required for CNC machining of parts such as enterprise standards and process documents. 4. Quality standards for product acceptance. 5. Existing production conditions and information. Manufacturing capacity of process equipment and special equipment, specifications and performance of processing equipment and process equipment, and technical level of workers. Second, the analysis of the blank state Most part design drawings only define the shape and size of the part when it is machined, and do not specify the data of the original blank material, including the type, size, shape, heat treatment state, and hardness of the wool. When programming, an in-depth understanding of wool is an important starting point. Using this raw information is beneficial to NC programming. 1. Assembly drawing and part drawing analysis of the product For the analysis and research of assembly drawings, it is mainly familiar with the performance, use and working conditions of the products, clarifying the mutual assembly position and function of the parts in the products, understanding the basis for the formulation of various technical conditions on the parts drawings, and finding out the main technical key points. The problem lays the foundation for a correct processing plan. Of course, when the ordinary parts are subjected to process analysis, the analysis of the assembly drawings may not be performed. 2, the process analysis of the parts drawing The analysis and research of the parts drawing is mainly to carry out the process review of the parts, such as checking the view of the design drawings, dimensioning, technical requirements, errors, omissions, especially for parts with poor structural structure, if possible and design The personnel communicate or make revisions, and the designer decides whether to make the necessary modifications and improvements. (1) Analysis of the integrity and correctness of the parts drawing The view of the part should meet the requirements of national standards, the position is accurate, and the expression is clear; the relationship between geometric elements (points, lines, and faces) (such as tangency, intersection, parallel) should be accurate; the dimension should be complete and clear. (2) analysis of parts technical requirements The technical requirements of the parts mainly include dimensional accuracy, shape accuracy, positional accuracy, surface roughness and heat treatment requirements. These technical requirements should be the limit values under the premise of ensuring the performance of the parts. The analysis of the technical requirements of parts is mainly to analyze the rationality of these technical requirements and the possibility of realization, focusing on the processing precision and technical requirements of important surfaces and parts, and preparing for the formulation of reasonable processing plans. At the same time, it is analyzed to determine whether the technical requirements are too strict, because too high precision and too small surface roughness requirements will complicate the process, increase the difficulty of processing, and increase unnecessary costs. (3) Analysis of dimensioning methods The dimensioning methods for part drawings include local dispersive labeling, centralized labeling, and coordinate labeling. For the parts machined on the CNC machine, the dimensions on the part drawing should be as concentrated as possible or marked with the same reference (ie, the coordinate size) on the premise of ensuring the performance. This facilitates the NC programming. It also facilitates the unification of design benchmarks, process benchmarks, and programming origins. (4) Analysis of parts and materials Under the premise of satisfying the function of the parts, cheap materials should be used. When selecting materials, they should be based on domestic products, and do not easily choose expensive and scarce materials. (5) Structural process analysis of parts The structural manufacturability of the part refers to the feasibility and economy of the designed part, which can be manufactured under the premise of meeting the performance requirements. Good structural processability makes parts easy to process, saves costs, and saves materials. Poor structural processability makes processing difficult