Self-tapping screw for plastic part

Abstract

The invention discloses a self-tapping screw for a plastic part and belongs to the field of self-tapping screws. The self-tapping screw comprises a nut and a screw rod and further comprises a washer. The nut is arranged at one end of the screw rod, and the other end of the screw rod is a flat-head end face; a transition arc is disposed in the combining position of the flat-head end face and the side surface of the screw rod; the screw rod is provided with a screw thread which is arranged in the whole length direction of the screw rod; the washer is fixedly connected with the screw rod; one end face of the washer abuts against the nut; the nut is a hexagonal pan head nut; a cross-shaped countersunk head groove is formed in the center of the upper end face of the nut. By means of the technical scheme, the mounting performance is high when the self-tapping screw fastens the plastic part, damage to the plastic part is avoided at the same time, and the self-tapping screw is reasonable in structural design, simple in principle and low in cost.

Description

Technical field [0001] The present invention involves a self -attack screw field, and more specifically, it involves a self -attack screw for plastic parts. Background technique [0002] With the development of the times, the development of the plastic automotive industry of the lightweight "phase" is inseparable from the development of the plastic industry.In recent years, the lightweight of automobiles has become an effective measure to reduce automobile emissions and improve combustion efficiency. It is also the main direction of the development of automobile materials. It has quickly increased the amount of plastic in the car. [0003] At present, the plastic dosage of many cars in the world has exceeded 120 kg / vehicle. Individual models are high. The plastic usage of German Mercedes -Benz advanced cars has reached 150 kg / vehicle.The plastic dosage of some domestic cars has also reached 90 kg / vehicle.It is foreseeable that with the acceleration of the lightweight process of t...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the deficiencies in the prior art such as poor fastening performance and affecting the local integrity of plastic parts when self-tapping screws fasten plastic parts, and provides a self-tapping screw for plastic parts. When fastening plastic parts with self-tapping screws, the installation performance is high, and the plastic parts will not be damaged at the same time, and the structure design is reasonable, the principle is simple, and the cost is low.

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