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How to identify the craftsmanship of the handle

Update:2022-05-09
Abstract:

There are two main types of handles in the mechanical a […]

There are two main types of handles in the mechanical accessories industry: plastic and steel. Steel parts are machined and cast parts. Plastic handles are available in thermosets and thermoplastics. The specific details are not described here. Let's see how the main four process handles are distinguished.
1. Lathe processing steel parts:
1. Measure whether the handle size is processed in strict accordance with the industry implementation standards (focus on the installation size).
2. Whether the screw part of the handle is made from the screw thread or the machine tool plate socket, here is the key point to distinguish, the accuracy and hardness of the screw are not very good and the surface is rough.
3. Whether the surface treatment of the handle is smooth and free of burrs, and whether the anti-rust treatment process has passed the test.
Second, the later lathe processing of the casting handle
1. Check whether the handle installation position, the accuracy of the screws and the overall handle size are fully processed in accordance with the standards of the mechanical department.
2. Whether the handle surface is rough and has sand holes.
3. Whether the surface treatment of the handle is smooth and free of burrs, and whether the anti-rust process has passed the test.
Three: Thermosetting plastic handle
First of all, let me introduce that the raw material used to make thermosetting plastic handles is phenolic plastic, commonly known as bakelite, bakelite, and the English abbreviation PF. The bakelite handle has the properties of insulation, friction resistance, no hand injury, strong hardness, no pollution, corrosion resistance, and a bright surface.
1. Check whether the surface of the bakelite handle is bright and free of burrs.
2. Whether the screws and nesting used in the handle are of sufficient grade, and whether the accuracy and rust-proof technology pass the test.
3. Whether the overall measuring handle is processed in accordance with the industry standard of the Ministry of Machinery.
4. The screws and threads of the handle are embedded in the bakelite handle. It is best to do a destructive experiment on the firmness of the metal part and the bakelite handle part. Generally speaking, the screws embedded in the handle must have a hexagonal nut and a full thread to prevent the screw from rotating 360 degrees in the handle or falling off. Some manufacturers will also add a hexagonal nut on the basis of the hexagonal nut full-thread bolt. enhance its firmness.
Fourth, the detection method of thermoplastic handle is the same as that of bakelite handle.
Differences between thermoset and thermoplastic handles:
Thermosetting plastics have high mechanical strength and a bright surface. It has good corrosion resistance, a wide range of temperature resistance conditions, and no deformation, but it is relatively brittle and cannot withstand heavy blows.
There are many kinds of thermoplastics, and they have their own advantages and disadvantages in terms of acid resistance, alkali resistance, chemical resistance, friction resistance, temperature resistance, etc. For details, please refer to the introduction of common plastic material properties in the technical articles on this site. The common points are compared with bakelite: yes Toughness, too much external force will deform too much, but not broken.

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