Which machinery processing factory in Jiangsu has a strong production strength?

Machining refers to the process of changing the shape, size or performance of a workpiece through a mechanical device. According to the different processing methods, it can be divided into cutting processing and pressure processing. The machines needed for processing include digital display milling machine, digital display forming grinder, digital display lathe, spark machine, universal grinder, machining center, laser welding, middle wire cutting, rapid wire cutting, wire cutting, cylindrical grinder, internal grinder and precision lathe. , can be used for turning, milling, planing and grinding precision parts. These machines are good at turning, milling, planing and grinding precision parts.

Machining technology refers to the whole process of making the shape, size, relative position and performance of the blank into qualified parts by traditional machining methods according to the drawings and sizes. Processing technology is the work that workers need to do before processing to avoid processing errors and economic losses.

Machining process is a step of manufacturing workpieces or parts. The process of directly changing the shape, size and surface quality of the blank to make it a part is called machining process. For example, the processing flow of an ordinary part is rough machining-finish machining-assembly-inspection-packaging, which is a general processing flow.

Machining technology is to change the shape, size, relative position and properties of the production object on the basis of technology, so as to make it a finished product or a semi-finished product. It is a detailed description of each step and each process. For example, as mentioned above, rough machining may include blank manufacturing, polishing, etc. And finishing can be divided into lathe, fitter, milling machine, etc. And each step should have detailed data, such as how much roughness and tolerance to achieve.

Technicians determine the technological process to be adopted according to the quantity of products, equipment conditions and workers' quality, and write relevant contents into technological documents, which are called technological procedures. This is more targeted. Every factory may be different, because the actual situation is different.

Generally speaking, the process flow is the program, the processing technology is the detailed parameters of each step, and the process specification is the specific processing technology compiled by a factory according to the actual situation.

Processing process:

Machining process specification is one of the process documents that stipulate the machining process and operation method of parts. Under specific production conditions, reasonable processes and operation methods are written into process documents in a specified form, which are used to guide production after approval. The specification of machining process generally includes the following contents: the process route of workpiece processing, the specific content of each process and the equipment and process equipment used, the inspection items and methods of workpiece, cutting dosage, working hour quota, etc.

Machining production process:

The production process of a machine refers to the whole process of manufacturing products from raw materials (or semi-finished products). For machine production, it includes transportation and preservation of raw materials, preparation for production, manufacturing of blanks, processing and heat treatment of parts, assembly and debugging of products, painting and packaging. The content of the production process is very extensive. Modern enterprises use the principles and methods of system engineering to organize and guide production, and regard the production process as a production system with input and output.

In the production process, the process of changing the shape, size, position and properties of the production object to make it a finished product or a semi-finished product is called a technological process. It is the main part of the production process. The technological process can be divided into casting, forging, stamping, welding, machining and assembly. Mechanical manufacturing process generally refers to the sum of parts processing process and machine assembly process, and other processes are called auxiliary processes, such as transportation, storage, power supply and equipment maintenance. The technological process consists of one or several continuous processes, and one process consists of several processes.

Working procedure is the basic unit of machining process. The so-called working procedure refers to the part of the process that a worker (or a group of workers) continuously completes on the same workpiece (or several workpieces at the same time) on the machine tool (or workplace). The main feature of a process is that the object, equipment and operator are not changed. The content of the process is that under the condition that the machining surface is unchanged, the machining tool is unchanged, and the cutting amount is unchanged, the continuous working step is also called the working stroke, which is a working step completed by the machining tool on the machining surface at one time.

To formulate the processing technology, it is necessary to determine how many processes the workpiece has to go through and the sequence of processes, and only list the names of the main processes and their processing sequence, which is called the process route.

The drafting of process route is the overall layout of the process, and the main task is to select the processing mode of each surface, determine the processing order of each surface and the work order number in the whole process. The formulation of process route must follow certain principles.

Types of machined products:

Production types are usually divided into three categories:

1. One-piece production: products with different structures and sizes are produced separately and rarely repeated.

2. Mass production: the same product is mass-produced within one year, and the manufacturing process is repeated.

3. Mass production: products are manufactured in large quantities, and most workplaces often repeat the processing of a certain part and a certain process.

Principles of process planning design and machining design;

(1) The designed process specification shall ensure the processing quality of machine parts (or the assembly quality of machines) and meet the technical requirements specified in the design drawings.

(2) To make the process have higher productivity and put the products on the market as soon as possible.

(3) Minimize the manufacturing cost.

(4) Pay attention to reducing the labor intensity of workers and ensure production safety.

Raw materials for processing:

(1) product assembly drawing and parts drawing.

(2) product acceptance quality standards.

(three) the annual production plan of the product.

(4) the manufacturer's production conditions, including the specifications, performance and present situation of machine tools and process equipment, the technical level of workers, the ability of self-made process equipment in the factory and the power supply and gas supply capacity of the factory.

(5) Design manuals and related standards required for process planning and design and process equipment design.

(6) Advanced manufacturing technology data at home and abroad, etc.

Machining steps:

(1) Analyze and study the assembly drawings and parts drawings of products.

(2) determine the blank.

(3) Draw up the process route and select the positioning base surface.

(4) Determine the equipment used in each process.

(5) Determine the tools, fixtures, measuring tools and auxiliary tools used in each process.

(6) Determine the technical requirements and inspection methods of each major working procedure.

(7) Determine the machining allowance of each process, and calculate the process size and tolerance.

(8) Determine the cutting parameters.

(9) Determine the working hour quota.

Machining allowance:

In the process from blank to finished product, the total thickness of the metal layer cut off on a machined surface is called the total machining allowance of the surface. The thickness of the metal layer removed in each process is called the machining allowance between processes. For revolving surfaces such as excircles and holes, the machining allowance is considered from the diameter, so it is called symmetrical allowance (that is, bilateral allowance), that is, the thickness of the actually cut metal layer is half of the machining allowance in diameter. The machining allowance of the plane is a unilateral allowance, which is equal to the thickness of the metal layer actually removed. The purpose of leaving machining allowance on the workpiece is to remove machining errors and surface defects left by the previous procedure, such as chilled layer, porosity and sand inclusion layer on the surface of the casting, oxide scale, decarburization layer and surface cracks on the surface of the forging, internal stress layer and surface roughness after cutting. So as to improve the accuracy and surface roughness of the workpiece. The size of machining allowance has great influence on machining quality and production efficiency. Excessive machining allowance not only increases the processing labor and reduces the productivity, but also increases the consumption of materials, tools and electricity, and increases the processing cost. If the machining allowance is too small, it can neither eliminate all kinds of defects and errors in the previous process, nor compensate the clamping error in this process, resulting in waste products. The selection principle is to make the margin as small as possible on the premise of ensuring quality. Generally speaking, the more finishing, the smaller the process allowance.

Development status of machining;

With the rapid development of modern machining technology, many advanced machining technologies and methods have emerged, such as micro-machining, rapid prototyping, precision ultra-precision machining and so on.

1, micromachining technology

With the development of micro/nano science and technology, micromechanics, which is characterized by tiny shape and size or extremely small operation scale, has become a high-tech for people to understand and transform the micro-world. Because MEMS can work in a narrow space without disturbing the working environment and objects, it has broad application potential in aerospace, precision instruments, biomedicine and other fields, and has become an important means of nanotechnology research, so it has been highly valued and listed as the first key technology in 2 1 century.

2. Rapid prototyping technology

Rapid prototyping technology was developed in the 20th century, which can quickly manufacture samples or parts according to CAD models. It is a method of material stacking processing and manufacturing, that is, three-dimensional forming is completed by orderly stacking of materials. Rapid prototyping technology integrates modern scientific and technological achievements such as numerical control technology, material technology, laser technology and CAD technology, and is an important part of modern advanced processing technology.

3, precision ultra-precision machining technology

Precision and ultra-precision machining is an important part of modern processing and manufacturing technology, and it is also one of the important symbols to measure the level of a country's high-tech manufacturing industry. Since the 1960s, with the development of computer and information technology, higher requirements have been put forward for manufacturing technology, which requires not only extremely high dimensional and shape accuracy, but also extremely high surface quality. It is in this market demand that ultra-precision machining technology develops rapidly, and various technologies and new methods are constantly emerging.