Why can’t the aircraft be welded? Decades of doubt finally understood!

When the bolt is broken, the easiest conclusion that people can draw is that the strength is not enough, so most of them adopt the method of increasing the strength level of the bolt diameter. This method can increase the pre-tightening force of the bolts, and the frictional force has also been increased. Of course, the anti-loosening effect can also be improved, but this method is actually a non-professional method, its investment is too large, and the benefits are too small.

Flange bolt pre-tightening force is the pre-tightening force in the direction of the axis of the bolt generated between the bolt and the connected part under the tightening torque during the bolt tightening process.

Bearing heat treatment is directly related to the subsequent processing quality, which ultimately affects the performance and life of the parts.

When the motor is running under load, the total internal loss is converted into heat energy to increase the temperature of the motor. The poor heat resistance in the motor is the insulating material. If the load of the motor is too large and the loss is too large to make the temperature exceed the allowable limit of the insulating material, the life of the insulating material will be shortened sharply.

Mechanical seals have become one of the most common forms of sealing in motorized equipment in oil refining and chemical installations. Moreover, with the continuous improvement of their design and manufacturing level and the continuous development of new materials, their application scope will be further expanded.

Traditionally, noise control engineers often used test methods to identify noise problems and repeated test methods to solve the problems. However, now many industries such as automobiles, aerospace, heavy equipment, industrial equipment, air conditioning, heating, home appliances, etc., are more focused on introducing simulation models for simulation at the early design stage. Therefore, design evaluation …

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IPX5 test method: 1. Nozzle inner diameter: 6.3 mm; 2. Water flow rate: 12.5 L / min; 3. Water pressure: according to the regulation of water flow; 4. the surface of the enclosure spray water (per square meter ): about 1 min; 6, the distance from the nozzle to the surface of the enclosure: 2.5-3 …

Continue reading “IPX5, IPX6 waterproof method test”

The basic content required for motor selection is: the type of load driven, rated power, rated voltage, rated speed, and other conditions.

This feature of Solidworks wraps the sketch onto a flat or non-planar surface. You can create a plane from a cylindrical, conical, or extruded model. You can also select a plane profile to add multiple closed spline sketches. Wrap features support contour selection and sketch reuse.

According to the systematic design concept, a hydraulic high velocity cutting machine was designed to meet the production of fast and accurate cutting round bar stock or wire. Subsequently, the performance and efficiency of the cutting machine was analyzed. This design work would provide enlightenment and reference in the cutting machine design field.

Summary of debugging problems of plane mask machine (worth a look)

In order to improve the plating efficiency, a negative voltage is generally applied to the workpiece.
The surface treatment technology of forging dies is not widely used in China, so it is necessary to develop in this field. Surface hardening support such as carburizing, nitriding, boronizing, carbonitriding of the whole mold cavity and local spraying, brush plating and surfacing of the mold cavity are very promising.