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The equipment and things used for the self-forging of the rivet have great versatility, and there is no need for a special mold for costing the goods. The metal blank is freely deformed between the upper and lower irons and is not bound by the mold. The shape and scale of the forging are mainly The forging's operational skills ensure that forgings from ten grams to hundreds of tons can be cast.
However, the rivet free casting has a high skill level for the blacksmith, the scale accuracy of the forging is low, the machining allowance is large, the Jinpu loss is large, the productivity is low, the working conditions are poor, and the strength is large. Therefore, it is reasonable to use the self-forging of the sea-marathon nails under the conditions of a single piece and small batch production.
In addition, with regard to the same forging, the tonnage of equipment required for self-forging is much smaller than that of swaging, so it is almost the only casting method for large forgings and has a special main position in heavy machine making.
Rivet material resistance principle, instrument, sample and measurement
1. Subject content and scope of application
This standard specifies the electrical resistivity measurement method for the wire for rivet contacts. This standard is applicable to all kinds of wires used for rivet contacts processed by various methods and is also applicable to other contact wires.
The basic principle of resistivity measurement is the principle of DC dual-arm bridge.
3. Measuring instrument
The measuring instrument consists of a DC double-arm bridge with an accuracy of 0.2 or higher and its accessories. The length measurement uses a vernier caliper or a ruler, and its graduation value should be no more than 0.5mm. The diameter of the rivet is measured by a micrometer with an accuracy of 0.01 mm.
There is no crack or other defects on the surface of the wire, it should be smooth, no oil and oxide layer. The wire diameter of the wire changes by no more than 1%.
5. Measurement of rivet material
The diameter of the wire is measured by using a micrometer, and each of the two ends of the sample is measured in two perpendicular directions. The arithmetic mean is taken, and the average of the cross-sectional diameters is taken at three points. The cross-sectional area is determined by the mass, density, and length of the sample. Density measurement is carried out according to JB/T 7780.1-1995. When measuring the length of the sample with a special fixture, the distance between the two potential ends parallel to each other on the clamp is repeatedly calibrated with a vernier caliper. When measuring the length with a ruler, the measurement error should be less than 0.2%.
After the rivet specimen is fixed in the fixture, it must be carefully checked whether the measurement line is accurate or not. The zero position of the galvanometer can be adjusted before the measurement. The ambient temperature at the measurement is 20±10 °C.
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