Computer gong processing

Production types are generally divided into three categories:

1. Single piece production: products with different structures and sizes are produced individually, and rarely repeated.
2. Batch production: the same products are manufactured in batches in a year, and the manufacturing process has certain repeatability
3. Mass production: a large number of products are manufactured, and most workplaces often repeat a certain process of a certain part. (1) The designed process specification shall ensure the processing quality of machine parts (or the assembly quality of the machine) and meet the technical requirements specified in the design drawing.

(2) It is necessary to make the technological process have higher productivity and put the products on the market as soon as possible.

(3) Try to reduce manufacturing costs

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

(1) Product assembly drawing, part drawing.

(2) Product acceptance quality standards.

(3) Annual production program of products.

(5) The production conditions of the manufacturer include the specifications, performance and current status of machine tool equipment and process equipment, the technical level of workers, the ability of self-made process equipment, and the power supply and gas supply capacity of the factory.

(6) Design manual and relevant standards required for process planning and process equipment design.

(7) Advanced manufacturing technology data at home and abroad.

Steps:

(1) Analyze and study the assembly drawing and part drawing of the product.

(2) Determine the blank.

(3) Draw up the technological route and select the base plane.

(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 main process.

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

(8) Determine the cutting parameters.

(9) Determine the man hour quota.

Design datum: the datum used to determine the position of other points, lines and planes on the part drawing, which is called design datum.

Process benchmark: the benchmark used in the process of parts processing and assembly. Dongguan computer gong processing, Dongguan Mechanical parts processing, Dongguan precision computer gong processing, Dongguan high-speed computer gong processing are called process benchmarks. According to different uses, process datum can be divided into assembly datum, measuring datum and locating datum.

(1) Assembly datum: the datum used to determine the position of parts in parts or products during assembly, which is called assembly datum.

(2) Measurement datum: the datum used to check the size and position of machined surface, which is called measuring datum.

(3) Positioning datum: the datum used for workpiece positioning during machining, which is called positioning datum. For the surface (or line, point) as positioning reference, only the rough surface can be selected in the first working procedure. This positioning surface is called rough datum. The machined surface can be used as the positioning datum in the following processes, and the positioning surface is called the precise datum.

In the process of turning a blank into a finished product, the total thickness of the metal layer cut off on a machining surface is called the total machining allowance of the surface. The thickness of the metal layer cut by each process is called the machining allowance between processes. For the rotating surface such as outer circle and hole, the machining allowance is considered from the diameter, so it is called symmetrical allowance (i.e. bilateral allowance), that is, the actual thickness of the metal layer cut off is half of the machining allowance on the diameter. The machining allowance of plane is unilateral allowance, which is equal to the actual thickness of the metal layer removed. The purpose of leaving machining allowance on the workpiece is to remove the machining errors and surface defects left by the previous process, such as the surface cold and hard layer, air hole and sand inclusion layer on the casting surface, oxide scale, decarburization layer and surface crack on the forging surface, internal stress layer and surface roughness after cutting. The precision and surface roughness of the workpiece are improved. The size of machining allowance has great influence on machining quality and production efficiency. If the machining allowance is too large, it not only increases the labor of machining, reduces the productivity, but also increases the consumption of materials, tools and power, and increases the processing cost. If the machining allowance is too small, it can not eliminate all kinds of defects and errors in the previous process, and can not compensate for the clamping error in this process, resulting in waste products. The selection principle is to make the allowance as small as possible on the premise of ensuring the quality. Generally speaking, the more finish machining, the smaller the process allowance.

Applicability:

In the process of turning a blank into a finished product, the total thickness of the metal layer cut off on a machining surface is called the total machining allowance of the surface. The thickness of the metal layer cut by each process is called the machining allowance between processes. For the rotating surface such as outer circle and hole, the machining allowance is considered from the diameter, so it is called symmetrical allowance (i.e. bilateral allowance), that is, the actual thickness of the metal layer cut off is half of the machining allowance on the diameter.