Tooth is one of the important parts on the excavator, shovel bucket is similar to human teeth, also wearing parts, is composed of tooth and tooth tip combination dipper teeth, both by pin shaft link. Due to the bucket tooth wear failure part is the tooth, as long as the replacement with a tip.
Because of the influence of the financial crisis, our country actively boost domestic demand, makes the domestic market of bucket teeth had a positive effect, make many bucket tooth manufacturers domestic market prospect is great!
A: stress analysis of bucket tooth face contact with by mining phase, in a complete different working stages in the course of digging the force is different. Tooth part first contact with the material surface, because of the fast, bucket tooth part hit from the stronger. If the lower yield strength of bucket tooth, will produce plastic deformation in tip. Along with the increase of mining depth, the bucket tooth stress distribution will change. When the bucket tooth cutting material, relative motion occurs, the bucket tooth and material produce very big are extrusion pressure on the surface, thus the bucket tooth face and produce larger friction between materials. If the material is a hard rock, concrete, etc., the frictional force is going to be great. The results of this process a few times and over the surface of the bucket tooth face from wear and tear, thus produce deep large furrows. Composition of dipper teeth is good effect to the length of service life of the dipper teeth, choose the bucket tooth, of course, more cautious idiot sold bucket tooth his bucket tooth I also used, the effect is good! Face after pressure working face is obviously higher than before, before working face serious wear and tear, and can determine the positive pressure and friction force is the major failure modes of bucket tooth external mechanical factors, plays a main role in the process of produce.
2: Process analysis of two samples from each respectively before and after the working face, smooth hardness test. Found on the same sample hardness difference is very big, the preliminary judgment is uneven. Sample to grinding, polishing, etching, found that each sample on obvious boundaries, just line different parts. From the macroscopic view, the pale gray, around the middle section, with darker color shows that the thing that is likely to be set casting, on the surface, be surrounded the parts should also be set pieces. In HRS – 150 digital rockwell hardness tester and MHV – 2000 digital display microhardness meter on line on both sides of the hardness test, respectively, showed significant differences (see table 1). Through the above analysis confirmed that the dipper teeth is set piece of structure. Close some of them are set piece, part is the matrix around them. The composition of both close, such as Cr, Mn, Si alloying elements, the main alloy elements (mass fraction, %) of 0.38 C, 0.91 0.83 0.83 Mn, Cr, Si. The mechanical properties of metallic materials depends on the material composition and heat treatment process. Differences between similar composition and hardness of bucket teeth without heat treatment that is put into use after casting. The organization behind the observation also proves this point.
Post time: Jul-05-2018