What are the original materials that should be available when formulating the machining process of p

Principles of design of processing process regulations.

On the premise of ensuring the processing quality of parts and meeting the technical requirements specified in the design drawings.

The process has high production efficiency and low cost.

Fully consider and make use of the existing production conditions, and make balanced production as much as possible.

Try to reduce the labor intensity of workers, ensure safe production, and create good and civilized working conditions.

Actively adopt advanced technologies and processes to reduce material and energy consumption, and should meet environmental protection requirements.

The raw materials required for the development of machining process specifications.

The design process specification must have the following original data:

Product assembly drawings, parts drawings. Product acceptance quality standards. Annual production program of the product. Blank material and blank production conditions.

The production conditions of the manufacturing plant, including the specifications, performance and current technical status of machine tool equipment and process equipment, the technical level of workers, the ability of the factory to make its own process equipment, and the ability of the factory to supply power and gas.

Design manuals and relevant standards used in process specification design and process equipment design.

Domestic and foreign manufacturing technical data, etc. A part of the same requirement, can be processed by several different processes, but there is always one process that is the most reasonable under given conditions, and people fix the relevant content of the process in the form of a document to guide production, which is called "process specification". The process specification is the main part of the technical documents, the main basis for the design and calculation of process equipment, material quotas, and working hour quotas, and the production regulations that directly guide the operation of workers, which have a negative impact on product costs and labor productivity.

There is a direct correlation between the consumption of raw materials. The quality of the preparation of the process specification. It plays an important role in ensuring product quality first.

The basic requirement for formulating process regulations is to maximize productivity and reduce costs under the premise of ensuring product quality. At the same time, on the basis of making full use of the existing production conditions of the enterprise, we should adopt domestic and international advanced technology as much as possible.

and experience and guarantee good working conditions.

The information that needs to be prepared is that first of all, it is necessary to determine the mechanical parts to be processed, then determine the machine tool, adjust the CNC technology, carry out batch detection of parts processing, adjust the frequency and quantity of processing, and prepare the corresponding operation.

It is necessary to have good advanced technology and technology, to use reasonable materials and energy, to use the drawings and straw paper and related dimensions used in processing, the processing steps, and the quality of product acceptance.

There should be parts drawings, equipment drawings, acceptance standards, blank production conditions, relevant information on power supply capacity, and relevant information on gas supply capacity.

1) The selected processing method should consider the processing economy and accuracy range of each processing method, and should be adapted to the accuracy requirements and surface roughness requirements of the machined surface;

2) The selected processing method can ensure the requirements of the geometric dimensional accuracy, shape accuracy and mutual position accuracy of the surface.

3) The selected processing method should be suitable for the machinability of the part material. For example, hardened steel, heat-resistant steel, etc., should be ground as finishing due to high hardness; Non-ferrous metals should be finished by high-speed fine turning or fine boring.

4) The selected processing method should be suitable for the structural shape, size and working condition of the part. For example, the hole of IT7 on the box is generally not used for drawing or grinding, but for boring (when the large hole) or hinge (when the small hole) is selected; Narrow planes are more suitable for planing without milling.

5) The processing method should be adapted to the type of production, and when mass production, efficient machine tools and advanced processing methods should be used. In the production of small batches of single pieces, general-purpose machine tools and conventional machining methods are mostly used.

6) The selected processing method should be compatible with the existing equipment conditions of the enterprise and the technical level of workers.

The arrangement of the machining sequence should generally follow the following principles: 1. The processing of the previous process cannot affect the positioning and clamping of the source and the next process. 2. In the same installation method or the same tool processing process, it is best to continuously pulse and crack to reduce the error caused by repositioning or tool change.

3. In the same installation, the process with little impact on the rigidity of the workpiece should be carried out first to ensure that the workpiece is gradually processed under sufficient rigidity conditions. Extended information: Cutting is a processing method that uses cutting tools (including tools, abrasives and abrasives) to cut the excess material layer on the blank or workpiece into chips, so that the workpiece can obtain the specified geometry, size and surface quality.

1. Machining technology refers to the whole process of using machining methods, in accordance with the drawings and dimensions of the drawings, so that the shape, size, relative position and nature of the blank become qualified parts, and the processing technology is the work that the process personnel need to do before processing, so as to avoid processing errors in the processing process and cause economic losses.

2. Develop process steps:

1) Calculate the annual production program and determine the type of production.

2) Analyze the parts drawing and product assembly drawing, and analyze the process of the parts.

3) Select the blank.

4) Draw up a process route.

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

6) Determine the equipment and tools, fixtures, measuring tools and auxiliary tools used in each process.

7) Determine the amount of cutting and the quota of working hours.

8) Determine the technical requirements and inspection methods of each main process.

9) Fill in the process documents.

1. Benchmark first.

The datum is machined out first, and then the datum is positioned to process other surfaces to ensure the processing quality.

2. Coarse first and then fine.

Rough machining is in the front, finishing is in the back, rough and fine are separated.

3. Primary first, then secondary.

The main surface is processed first, and then the secondary surface is processed, such as the main surface refers to the assembly surface and the working surface, and the secondary surface refers to the keyway and the optical hole for connection.

4. Face first and then face.

For workpieces such as boxes, brackets and connecting rods, the plane should be processed first and then the holes should be processed, because the plane profile size is larger, the plane positioning and installation are stable, and the holes are usually processed by plane positioning, so as to ensure the position accuracy of the plane and the hole.

The processing technology of this part should be argued as follows:

By clamping the outer circle of 53, the hole of boring 40;

Through the axis of the 40 holes that have been machined as a reference (with the centering fixture at both ends, the outer round line in the following figure is used as an auxiliary positioning), mill the 3 platforms in the following figure, pay attention to controlling the height difference and drilling, tapping;

3.Inverted 180 degrees, the two platforms caused by the triangle in the following figure are positioning surfaces, and the datum a of the dust degree of the high-purity stove is 110; <>

4.Reverse 180 degrees again, take the datum a of processing to make Zen as the positioning surface, and boring the hole of 22;

5.Rotate 90 degrees, take the 22-hole axis processed in the previous step as a reference, and process the grease nozzle hole of 1.

At present, many of our units are, blanking --- rough milling on six sides, grinding on four sides --- grinding on four sides--- milling profile--- drilling, tapping --- inspection - heat treatment--- grinding--- wire cutting --- inspection. (Now many raw material suppliers can supply ready-made materials according to the size you give, many can save rough milling, grinding and other processes, and direct processing of incoming materials is also OK).

Principle, there must be in the machining book, I guess you are the same as I was back then, I think it is not very intuitive, different pieces are different, I can't use the above list as any reference at all, just want you to know that some parts are processed like this. When I first came out of school, I was in this state, and it got better slowly, time, it takes time...

1. Processing benchmark. The machining benchmark must be machined as early as possible;

2. Clamping and testing datum. Before each step of processing, there must be a corresponding clamping and testing datum, which determines the sequence of processing.

3. Economy. This includes the selection of the process route and the determination of the machining allowance.

4. Equipment condition. Different equipment capabilities determine different processing routes.

5. The timing of heat treatment. The timing of heat treatment should take into account the machining accuracy, processing economy and equipment capacity.

1. Machining technology refers to the whole process of using machining methods, in accordance with the drawings and dimensions of the drawings, so that the shape, size, relative position and nature of the blank become qualified parts, and the processing technology is the work that the process personnel need to do before processing, so as to avoid processing errors in the processing process and cause economic losses.

2. Develop process steps:

1) Calculate the annual production program and determine the type of production.

2) Analyze the parts drawing and product assembly drawing, and analyze the process of the parts.

3) Select the blank.

4) Draw up a process route.

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

6) Determine the equipment and tools, fixtures, measuring tools and auxiliary tools used in each process.

7) Determine the amount of cutting and the quota of working hours.

8) Determine the technical requirements and inspection methods of each main process.

9) Fill in the process documents.

In the production process, the process of changing the shape, size, position and nature of the production object to make it a finished or semi-finished product is called a process. Other processes are referred to as ancillary processes.

The process can be divided into: casting, forging, stamping, welding, machining, heat treatment, assembly and other processes. The course "Fundamentals of Mechanical Manufacturing Technology" only studies the machining process and the assembly process.

Process refers to the sum of various production activities continuously completed by a worker (or a group) of workers on one (or several) labor objects at a work site (such as a machine tool). It is the smallest unit that makes up the production process. A number of processes make up the process stage.

Divide the process: it is to control the quality, improve the work efficiency and reduce the cost.

To put it simply, each product needs to be divided into many steps to produce a finished product, and these steps are the so-called processes. The division of the process is mainly to ensure that the product is produced according to the arrangement of technical personnel in the processing and production, so that the product will not produce defective products. The whole process of producing finished products is called process.

Let's take steel products as an example! Generally speaking, it is billet making, heat treatment, machining (divided into various processes, such as lathe, milling machine, drilling machine with a process card to indicate how to process step by step, what to do first and then what to do), clamping, surface treatment.

Turning, milling, planing, grinding, rolling... There are too many processes for cutting, riveting, welding, assembling, debugging, shearing, folding, the process is the existing 1 and then 2, and there are parallel processes, etc., and the division of the process is to increase the quality and quantity, control the finished product, and hold the responsibility clear.