The locksmith is a method that mainly uses hand-held tools to cut the workpiece clamped by the vice on the locksmith workbench. It is one of the important jobs in the machinery manufacturing industry. The basic operations of locksmiths can be divided into:

1. The auxiliary operation is marking, which is the operation of marking the machining boundary on the blank or semi-finished workpiece according to the drawing.

2. Cutting operations include chiseling, sawing, filing, tapping and tapping. Drilling (reaming and reaming), scraping and grinding.

3. Assembly operation is the process of assembling parts or components into machines according to the technical requirements of drawings.

4. Maintainability operation refers to maintenance, that is, maintenance, inspection and repair of machinery and equipment in use. The following content can only be seen by replying to the post.

Second, the fitter's scope of work and its role in machinery manufacturing and maintenance

1. Scope of work of ordinary locksmith

(1) Preparation before processing, such as cleaning the scribing on the blank, blank or semi-finished workpiece.

(2) Repairable processing of a single part;

(3) Drilling, reaming, tapping and tapping. During assembly of parts;

(4) Machining precision parts, such as scraping machines or grinders, mating surfaces of measuring tools and tools, and finishing of fixtures and molds.

(5) Matching and trimming of parts during assembly;

(6) Assembly, debugging, adjustment and maintenance of the machine.

2. The role of locksmith in machinery manufacturing and maintenance.

Locksmith is a complicated, subtle and demanding job. Although there are various advanced processing methods at present, locksmiths have the characteristics of simple tools, diverse and flexible processing, convenient operation and wide adaptability, so a lot of work still needs locksmiths to do. As mentioned above, the scope of application of locksmiths is effective. Therefore, locksmith plays a special and irreplaceable role in machinery manufacturing and maintenance. However, locksmith has high labor intensity, low production efficiency and high requirements for workers' technical level.

Three, fitter workbench and vice

1. Desktop workbench

Vice table, usually made of hardwood or steel, requires firmness and stability. The height of the table is about 800 ~ 900 mm, and the table is equipped with vice and protective net.

2. vise

The vice is used to clamp the workpiece, and its specification is expressed by the width of the jaw. Commonly used are 100, 125 and150 mm. When using a vise, you should pay attention to:

(1) The workpiece is sandwiched between the jaws as far as possible, so that the jaws are evenly stressed;

(2) The clamped workpiece should be stable and reliable, easy to process and not deformed;

(3) When clamping the workpiece, it is generally only allowed to use the handle hand in hand, and it is not allowed to beat the handle with a hammer or put on a long tube at will, so as not to damage the lead screw, nut or pliers.

(4) Don't knock the smooth surface of the movable pliers body, so as not to reduce the fit performance;

(5) In the process of machining, the direction of force is preferably toward the fixture body.