China Yi Tuo Group Co., Ltd.
Two. Company Profile China Yi Tuo Company is the factory site personally finalized by President Mao Zedong and the factory director personally appointed by Premier Zhou Enlai. It is the birthplace of China's first tractor, the first roller and the first military off-road vehicle. ? Dongfanghong? -This resounding name reflects the joy of turning over peasants in New China.
After more than 50 years of development, China Yi Tuo Company has become a large-scale comprehensive equipment manufacturing enterprise group with agricultural equipment, construction machinery, power machinery, automobile and parts manufacturing as its main business. Among the company's many products, the market share of high-power wheeled tractors, crawler tractors, off-road medium diameter diesel engines, rural construction machinery and other products ranks first in China; Roller, small and medium power wheeled tractor and other products. , occupying the top three in the domestic market.
Third, the internship time
20xx August 9th 20xx August 2nd1
Fourth, the purpose and requirements of the internship
(1) Purpose of production practice
Production practice is an important practical teaching link arranged according to the teaching plan of this major. Its purpose is to make students understand and master the basic practical knowledge of professional production, confirm and consolidate the professional knowledge and other related knowledge they have learned, cultivate students' ability to integrate theory with practice, and lay a foundation for the study of subsequent professional courses.
(2) the requirements of production practice
1. Technical aspects
Under the guidance of factory technicians and teachers, through reading process documents and on-site comparative understanding, the following requirements are achieved:
1 Be familiar with various technological methods of machining and the technological process of parts from blank to finished product.
Familiar with the process of two typical parts (shaft and box) (including how to make process cards, how to determine the size of each process, the choice of machine tools, positioning benchmarks, fixtures, tools and measuring tools, etc.). ), and requires careful analysis of each process according to the process card.
Familiar with typical fixture, able to draw a sketch of fixture assembly.
(4) Participate in certain assembly work, be familiar with various assembly methods, and understand the requirements of designers to achieve assembly accuracy.
Understand all kinds of special machining methods, such as electric machining, all kinds of ultra-precision machining, etc.
Familiar with the measurement methods of various mechanical quantities in the factory (such as length, outer diameter, speed, torque, gear measurement, etc.). )
2. Design aspect
Under the guidance of factory technicians, the following requirements can be achieved through on-site visits, reading drawings or disassembling the mechanism:
1 Understand the general design of typical machine tools (or some special machine tools) and the basic procedures of parts design.
Familiar with the working principle and basic structure of various typical mechanical structures, such as various variable speed and control mechanisms, interlocking mechanisms and typical molds.
Understand the structure of typical mechatronics machines, and be familiar with the control and execution system of machinery, electricity, gas and liquid.
Verb (short for verb) scheduling
On the morning of August 9th, First Power Machinery Co., Ltd.
On the afternoon of August 9th, Yi Tuo Forging Branch.
3. August morning of the third assembly plant 10.
4. Gear processing factory in August afternoon 10.
Verb (abbreviation of verb) Yi Tuo Foundry Company August 03 morning 13.
6. Yi Tuo Thermal Treatment Plant in the afternoon of August 13.
7.1Brief introduction of crankshaft manufacturing process in the morning of August 4.
14 August afternoon, Luoyang LYC Bearing Co., Ltd.
9./kloc-August morning of 0/5, CNC machine tool plant.
The first assembly plant 10 and August afternoon 15.
Yi Tuo Institute of Engineering Materials on the morning of November, August 16.
12.8 16 afternoon, No.2 tractor factory (small tractor)
Thirteen. Citic heavy industries August 17 am (not visited)
August 14 17 afternoon gear processing technology lecture.
15. Lecture on the application of numerical control technology on the morning of August 20th.
16. citic heavy industries power plant on the afternoon of August 20th.
17, August 2 1 morning public lecture on heat treatment.
18. Dayang motorcycle factory on the afternoon of August 2 1.
Sixth, the internship content
1, factory education
1. 1 Visit Dongfanghong Agricultural Museum
China Yi Tuo Exhibition Hall mainly displays Yi Tuo's agricultural products and reliefs. In Yi Tuo Exhibition Hall, we can see: history and cultural relics related to farming; Steam tractor; Agricultural machinery and related items in the early days of the founding of New China; Some new and old products in Yi Tuo, China and various related materials in Yi Tuo, China. Through the introduction of the commentator, I got a better understanding of the history of farming and tractor development in China, and also got a deeper understanding of the history, development, present situation and products of Yi Tuo.
1.2 safety education
Venue: Meeting room on the second floor of Yi Tuo internship reception.
Safety education showed us safety production records and accident cases, and some preventive measures and bloody cases were terrible. These bloody cases have sounded the alarm for people! Its security risks can be divided into six categories:
1. Mechanical hazards, mainly mechanical hazards.
There are two kinds of chemical hazards: gaseous and liquid.
3. The harm of combustion and explosion is mainly the comprehensive action of machinery, chemistry and thermal effect.
4. Thermal hazard.
5. Electrical hazard.
6. Other hazards.
And the only way to put an end to these security risks is to strictly abide by the safety requirements of the factory and pay attention to the key points:
1. Smoking is strictly prohibited in any area of the factory;
2. You must queue up to enter the factory;
3. Protect the garden and care for flowers and plants;
4. Do not block the entrance and exit of the factory, and do not stand on the main road of the factory;
5. Keep the factory environment clean;
6. It is forbidden to take pictures in the factory;
7. It is forbidden to drink alcohol during the production practice;
8. It is forbidden to wear slippers, sandals and high heels into the factory. Pants are required, and the cuffs and collars of clothes should be fastened. People with long hair will put their hair in a hat and can't carry a backpack into the factory;
9. The factory belongs to the production organization and strictly abides by all kinds of machine tools.
10. Due to the splashing of machine tool oil lubrication, the road surface is slippery, so pay attention to anti-skid when entering the factory;
1 1. Pay special attention to vehicles and bridge cranes driving in the aisle.
12. The process documents can be read, but they cannot be moved, let alone copied.
13. You can ask if you don't understand anything, but it is absolutely forbidden to do it yourself.
2. Forging workshop
2. 1 Introduction
Specializing in the production of all kinds of forging parts, crankshaft parts rely on a forging company, which has many large forging equipment. After entering the factory, we first listened to some employees' views on the factory.
The general introduction and the introduction of the basic process of forging production, and re-emphasized some safety common sense and requirements for entering the forging plant, and then visited the production workshop with a safety helmet.
Most of the bars in the forging plant are 45 steel. What is the diameter? 20mm~？ 3000 mm, 6 meters long. Equipment includes: shearing machine, sawing machine, steam hammer, press, flat forging machine, hot die press, roll forging machine, air hammer, electric furnace, gas stove, etc. Hardness test is needed before and after heat treatment, and the main equipment for hardness test is Brinell hardness tester. There will be black scales after heat treatment, which need to be cleaned by shot blasting machine. After the scale is removed, it will be inspected and deburred. Magnetic particle inspection is used to check whether there are cracks on the surface of parts. The method is to magnetize the magnetic suspension to see if there are cracks under fluorescence, and finally demagnetize.
2.2 production process
The process flow chart is as follows:
Blanking (including shearing machine blanking and high-speed band saw blanking), 26 production lines, intermediate frequency induction forging (1 150℃ heating), hammer forging (i.e. preforming, stretching, flattening and clamping), initial forging, final forging, cooling trimming, pressing, punching and heat treatment (quenching, tempering and normalizing), etc., which may cause deformation of parts.
2.3 Main products
One of the main products of forging factory is crankshaft, which is one of the three major components of engine. Because the working nature of the crankshaft determines that its working conditions are affected by periodic alternating stress, the strength, stiffness and wear resistance are highly required when selecting crankshaft materials. Considering the economy comprehensively, 45 steel is selected, and its carbon content is 0.42%-0.47%. However, high-power engines with high compression ratio and high output power, such as supercharged diesel engines, will have a greater effect on bending capacity, so the material is 42 CRM. A.
3. The Third Assembly Plant
3. 1 Introduction
China Yi Tuo Group Co., Ltd. (China Yi Tuo for short) is a country? A five? One of the key construction projects during 156, 1955 started construction, and 1959 was completed and put into production. China is a super-large machinery manufacturing enterprise. Dongfanghong? The trademark is China? A well-known trademark? . The company is headquartered in jianxi district, Luoyang, Henan Province. Yi Tuo, China, is the factory site personally finalized by President Mao Zedong and the factory director personally appointed by Premier Zhou Enlai. It is the birthplace of China's first tractor, the first roller and the first military off-road vehicle. ? Dongfanghong? -This resounding name reflects the joy of turning over peasants in New China.
After more than 50 years of development, China Yi Tuo Company has become a large-scale comprehensive equipment manufacturing enterprise group with agricultural equipment, construction machinery, power machinery, automobile and parts manufacturing as its main business. Among the company's many products, the market share of high-power wheeled tractors, crawler tractors, off-road medium diameter diesel engines, rural construction machinery and other products ranks first in China; Roller, small and medium power wheeled tractor and other products. , occupying the top three in the domestic market.
In 20 13, the State Council announced the seventh batch of national key cultural relics protection units. 1954 Soviet-aided Soviet-style buildings in Luoyang were selected as important historical sites and representative buildings in modern times. 20 1 1 in may, the block where these Soviet-style buildings are located was rated as? China Historical and Cultural Street? It is the only industrial heritage street among the top ten streets in China.