Assembler test question - 1, rolling technology (61)
一、Multiple choice questions
1. One of the processes to ensure assembly accuracy is (A).
A, adjustment assembly method B, gap assembly method C, interference assembly method D, transition assembly method
2. General assembly is the process of combining (D) and components into a complete product.
A, component B, sub-component C, assembly unit D, part
3. Assembly process equipment is mainly divided into three categories: (B), special tools, auxiliary devices.
A, horn B, inspection tool C, ruler D, square ruler
4. Manual cleaning is especially used in (D)
A. Intermediate cleaning B. Pre-cleaning C. Final cleaning D. Fine cleaning
5. The following seals can only be used for dynamic seals (B)
A, gasket B, oil seal C, sealant D, O-ring
6. The assembly reference part is the part that (B) enters the assembly.
A, the last; B, the first; C, the middle; D, the right time
7. Adjustment refers to the work of adjusting the mutual position of (D), the matching clearance, and the degree of combination.
A, Part B, Part C, Mechanism D, Part and Mechanism
8. When assembling, (A) can not directly tap the parts.
A, steel hammer B, plastic hammer C, copper hammer D, rubber hammer
9. The assembly operation that uses a pressure tool to move the assembly under a continuous thrust is called (C)
A. Clamping B. Measuring C. Pressing in D. Positioning push-pull
10. When assembling small bearings, (A) is usually used
A, mechanical method B, hydraulic method C, oil pressure method D, temperature difference method
二、Fill in the blank
1. There are two types of guide rails: __guide__ and __support__.
2. The two types of seals are: static seals and dynamic seals.
3. The commonly used cleaning methods are manual cleaning, dipping method, spray method, high pressure cleaning method and steam degreasing method.
4. Assembly terminology has three characteristics: generality, functionality and accuracy.
5. The main operations of assembly include installation, connection, adjustment, inspection and test.
6. The assembly and disassembly methods of bearings include: mechanical method, hydraulic method, oil pressure method and temperature difference method.
7. The disassembly step can be divided into two stages, called the preparation stage and the implementation stage respectively.
8. When assembling the gasket, apply a layer of grease to the gasket to prevent movement.
9. The specification of the open-end wrench refers to the _opening width_dimension of the wrench.
10. The four factors that affect the cleaning process are chemical action, time, temperature, and movement.
三、True or False
1. As long as the workpiece is limited by less than 6 degrees of freedom, it is incomplete positioning (√).
2. The closed ring of the assembly dimension chain is to ensure the assembly accuracy (√).
3. Most of the assembly process methods for mass production are mainly based on the adjustment method (×).
4. The micrometer can measure the rotating workpiece (×).
5. Vernier calipers can be used to measure grooves and depths (√).
6. The assembly drawing expresses the shape, structure, working principle and technical requirements of the machine or component (×).
7. Shape tolerance refers to the total variation (√) allowed by the shape of a single actual element.
8. The auxiliary device is one of the basic components of the hydraulic system (√).
9. Ordinary thread is divided into coarse thread ordinary thread and fine thread ordinary thread (√).
10. The random error determines the precision of the measurement. The smaller the random error, the lower the precision (×).
四、Short answer questions
1. In the machine, the functions of the parts are different. Please give five examples to explain.
Answer: ①Gear: transmission of power, movement ②Key: axial positioning of parts on the shaft ③Pin: positioning element ④Oil seal: Prevent oil leakage or dust from entering ⑤Bearing: Support shaft ⑥Bolt: Tighten.
2. What are the commonly used disassembly methods?
Answer: ① Dismantling by knocking method: knock with a hand hammer to remove the parts. ②Pulling method disassembly: It is a disassembly method with little static force or impact force, and is suitable for disassembling parts with high precision. ③Demolition by top pressure method: It is a static disassembly method, which is suitable for the disassembly of static fittings with simple shapes. ④Temperature difference method disassembly: refers to the method of heating the containment or cooling the containment. ⑤ Demolition by destruction method: Generally, methods such as car, saw, drill, and gas cutting are used.
3. In order to meet the requirements of the drawings, what are the requirements that the parts must meet in the assembly?
Answer: ①I(mǎi)nstall in the correct order ②Install according to the method specified in the drawing ③Install according to the position specified in the drawing ④Install according to the specified direction ⑤Install according to the specified dimensional accuracy.
4. Try to compare the operation difference between fixing and tightening?
Answer: Fixed: It is to fasten the parts that are finger-tightened in the assembly, and its purpose is to prevent the movement of the parts. Fastening: is the operation of connecting two or more parts by means of fasteners. For example, use bolts to connect parts, or use circlips to fix rolling bearings. Fastening is generally done with fingers, and then appropriate adjustments can be made; while fixing is tightened with tools and cannot be adjusted.
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