Machinery manufacturing refers to the industrial departments engaged in the production of various power machinery, lifting and transportation machinery, agricultural machinery, metallurgy and mining machinery, chemical machinery, textile machinery, machine tools, instruments, instruments and other machinery and equipment.Machinery manufacturing industry provides technical equipment for the entire national economy, and its level of development is one of the main indicators of the country's industrialization.
The production process
The production process of products refers to the whole process of turning raw materials into finished products.The production process of mechanical products generally includes:
(1) production and technical preparation, such as process design and special process equipment design and manufacturing, production planning, production data preparation;
The blank manufacturing such as casting, forging, stamping, etc.
Machining (3) machining, heat treatment, surface treatment of parts, etc.;
Of products such as final assembly, department assembly, commissioning and inspection and paint;
5] production services such as raw materials, outsourcing parts and tools supply, transportation, storage etc..
The production type
The classification of the degree of production specialization of an enterprise (or workshop, section, shift and work place) is called production type.Production types can be generally divided into: single production, batch production, mass production of three types.
(1) production of single piece
The basic characteristics of single production are: the production of a wide range of products, the output of each product is very small, and rarely repeated production.For example, the manufacturing of heavy machinery products and the trial production of new products all belong to the single-piece production.
The production is in batch
The basic characteristics of batch production are: batch production of the same products, the production cycle repeat.Such as machine tool manufacturing, motor manufacturing belong to batch production.Batch production can be divided into small batch production, medium batch production and mass production according to its batch size.Among them, the process characteristics of small batch production and mass production are similar to those of single production and mass production respectively.The process characteristics of medium batch production are between small batch production and large batch production.
But we are in production
The basic characteristic of mass production is: the output is big, breed is little, the processing of a certain working procedure of a certain part is carried out repeatedly for a long time in most working places.For example, the manufacture of automobiles, tractors, bearings, etc., is mass production.
The manufacturing process
Product design is the core of enterprise product development, product design must ensure the advanced technology and economic rationality.
Product design generally has three forms, namely: innovation design, improvement design and deformation design.Innovative design (development design) is a new design according to the user's requirements;Improved design (adaptive design) is based on the user's requirements, the original product of the enterprise to improve or modify the design, that is, only part of the structure or parts of the redesign;Deformation design (parameter design) only improves part of the structure size of the product to form a series of product design.The basic contents of product design include: preparation of design assignment, scheme design, technical design and pattern design.
The process design
The basic task of process design is to ensure that the products produced can meet the requirements of design, formulate the manufacturing process regulations for high-quality, high-yielding and low-consumption products, and formulate all the process documents required for trial production and formal production of products.Including: process analysis and review of product drawings, preparation of processing plans, preparation of process procedures, and design and manufacturing of process equipment.
Processing of parts
The processing of parts includes the production of blank, various mechanical processing, special processing and heat treatment of blank, etc., so as to make it a qualified part.Very few parts are processed by precision casting or precision forging.Usually the blank production has casting, forging, welding and so on;Common machining methods are: locksmith processing, turning processing, drilling processing, planing processing, milling processing, boring processing, grinding processing, CNC machining, broaching processing, grinding processing, honing processing;Common heat treatment methods are: normalizing, annealing, tempering, aging, tempering, quenching and so on;Special processing: edm molding processing, edm wire cutting processing, electrochemical processing, laser processing, ultrasonic processing and so on.Only according to the parts of the material, structure, shape, size, performance and so on, choose the appropriate processing methods, in order to ensure the quality of products, production of qualified parts.
Inspection is to use measuring instruments to detect the dimensional accuracy, shape accuracy and position accuracy of wool damage, parts, finished products and raw materials, as well as to identify product quality by visual inspection, nondestructive inspection, mechanical performance test and metallographic inspection.
Measuring instruments include measuring instruments and measuring instruments.The commonly used measuring tools are steel ruler, tape measure, vernier caliper, caliper, plug gauge, micrometer, Angle gauge, dial gauge, etc., which are used to test the length, thickness, Angle, diameter of the outer circle, aperture, etc.In addition, the measurement of thread can be made by thread micrometer, three-pin gauge, thread template, thread ring gauge, thread plug gauge, etc.
The constant dosage meter has the buoy type air momentum meter, the electronic type quantity meter, the electric type quantity meter, the optical quantity meter, the three coordinate measuring instrument and so on, in addition may examine the part length, the thickness, the outside circle diameter, the aperture and so on dimensions, but also may carry on the measurement to the part shape error and the position error and so on.
Special inspection mainly refers to the inspection of the internal and external defects of parts.Among them, nondestructive inspection is a modern inspection technology to detect the internal and external defects of parts without damaging the tested objects.Nondestructive testing methods include direct visual inspection, X-ray inspection, ultrasonic inspection, magnetic inspection, etc., and appropriate methods and testing specifications shall be selected according to the purpose of nondestructive testing.
Set set debugging
Any mechanical product is composed of several parts, components and parts.Carry out necessary coordination and connection of parts and components according to specified technical requirements.
The process of making a semi-finished product or finished product is called assembly.The process of assembling parts and components into components is called component assembly.The process of assembling parts, components and parts into final products is called general assembly.Assembly is the last stage of the mechanical manufacturing process, which also includes adjustment, testing, inspection, painting and packaging.
Common assembly work includes: cleaning, connection, calibration and preparation, balance, acceptance, testing.
 put in storage
Finished products, semi-finished products and various materials produced by the enterprise are put into the warehouse for storage to prevent loss or damage, which is called warehousing.
Incoming inspection shall be carried out at the time of warehousing, and inspection records and relevant original records shall be filled in;Maintain and keep measuring tools, instruments and tools;The relevant technical standards, drawings, files and other materials shall be properly kept;Keep the working place and indoor and outdoor clean, pay attention to fire and humidity, do a good job in safety.