37results about How to "Prevent brittle fracture" patented technology

The invention relates to a control device for non-positive connections, especially screw connections. The device includes two force application elements and a measuring element arranged therebetween. The measuring element is at least partially provided with a layer having a force sensory effect. The surface of the layer is provided with elevations for receiving a force applied by the force application elements.

The invention discloses a preparation method for producing flat filaments by using PET (Polyethylene Terephthalate). The method comprises the following steps: (1) slicing PET polyester, mixing the sliced PET polyester with a toughening agent, an antioxidant and a filler, and feeding the dried slices into a screw extruder; (2) performing melt blending on the dried slices in the screw extruder at the temperature of 250-290 DEG C in the screw extruder, and performing a chain extension reaction; (3) cooling a melt in the presence of an adsorption system to obtain thick sheets; (4) heating the thick sheets obtained in the step (3) and stretching the thick sheets to obtain primary flat filaments, wherein stretching is carried out in two steps; (5) further cooling and flattening the primary flat filaments, performing electrostatic elimination treatment, and coiling. Compared with the prior art, the PET flat filaments produced by using the method is over 200MPa in the tensile strength and lower than 50 percent in the elongation at break, and can be applied to the field of high-performance woven bags and flexible freight bags.

The invention discloses a cold rolling method for high-magnetic-induction grain-oriented silicon steel in the extremely thin specification. The method comprises steps as follows: (1) the thickness before rolling ranges from 2.0 mm to 2.5 mm, and normalization pickling is performed; (2) the primary cold rolling method is adopted, and continuous reversible seven-pass cold rolling is performed: (2.1) rough-surface working rolls are adopted for the first five passes, and fine-surface working rolls are adopted for the last two passes; (2.2) the reduction rate of each pass is controlled, the reduction rate of the first pass ranges from 30% to 45%, the reduction rate of the last pass ranges from 18% to 31%, and the reduction rates of the rest passes range from 24% to 42%; (2.3) technological lubrication and cooling are performed through emulsion spraying; the plate temperature in the first three passes is controlled to gradually increased to 200-230 DEG C; the temperature is reduced for rolling in the fourth pass; the plate temperature in the subsequent passes is controlled to be 60-80 DEG C; (2.4) automatic plate shape control is performed; (2.5) the rolling force in each pass is controlled to range from 250 T to 520 T; the unit tension on the entrance side of each pass is controlled to range from 2 kg / mm<2> to 20 kg / mm<2>, and the unit tension on the exit side of the pass is controlled to range from 15 kg / mm<2> to 30 kg / mm<2>; (2.6) the product thickness after rolling ranges from 0.15 mm to 0.2 mm; (3) subsequent procedures are conducted conventionally. With the method, the production efficiency of the high-end silicon steel in the extremely thin specification is substantially increased, and products are free of plate shape quality defects and are high in surface quality.

The invention discloses a high-toughness abrasion-resistant alloy steel for an excavator bucket, which comprises the following chemical components in percentage by weight: 0.24-0.28% of C, 0.6-1.0% of Si, 1.2-1.5% of Mn, 0.6-1.1% of Cr, 0.3-0.5% of Mo, 0.05-0.10% of V, 0.004-0.006% of B, 0.08-0.12% of Ti, 0.01-0.025% of Ce, 0.02-0.03% of La, P less than or equal to 0.03%, S less than or equal to 0.03% and the balance of iron and impurities. Compared with the traditional high-manganese steel, the high-toughness abrasion-resistant alloy steel disclosed by the invention has the advantages of higher abrasion resistance, toughness and impact resistance; and the high-toughness abrasion-resistant alloy steel can be used for ensuring that the normal working of an excavator, preventing and controlling the early brittle failure, reduces the shut-down and maintenance times, increases the labor productivity and the equipment utilization ratio and reduces the production cost.

Disclosed are a panel for repairing and reinforcing a concrete body, a multi-purpose anchor, an anchor for level adjustment and injection a method for repairing and reinforcing the concrete body using the same, which can connect adhesives and anchors at weak parts of the concrete body, which is neutralized, aged, deteriorated, cracked due to water leakage, or segregated, or at parts requiring the repair and reinforcement due to a change in use environment. The composite reinforced panel includes lightweight concrete, high strength concrete or a steel plate and reinforcing means, thereby being effectively prevented from bad environments causing a drop of reinforcing capacity, providing good heatproof and fireproof properties, and maximizing merits of materials used as the reinforcing means. The multi-purpose anchor has a bolt and an injection pipe, fixes the panel to the concrete body effectively, serves as a spacer maintaining a prescribed interval between the panel and the concrete body, and serves to inject filler and discharge the inside air to the outside, thereby improving construction efficiency. The anchor for level adjustment and injection has a male screw and a female screw at an end and an injection pipe of a straw type, thereby improving the construction efficiency when the concrete panel is installed.

A first SiC layer formed into a tubular shape and made of a SiC material, a first groove which spirals in one direction along the outer periphery of the first SiC layer, a first SiC fiber layer made of a plurality of SiC fibers wound along the first groove, a second SiC fiber layer made of a plurality of SiC fibers wound outside of the first SiC fiber layer in a direction different from the one direction, and a second SiC layer which is made of a SiC material and which covers the first SiC layer, the first SiC fiber layer, and the second SiC fiber layer are provided. The first SiC fiber layer and the second SiC fiber layer are separated from each other at intersections of the first SiC fiber layer and the second SiC fiber layer.

The invention discloses an excavator silicon-manganese alloy steel bucket tooth cast which comprises the following chemical components in percentage by weight: 0.28-0.32% of C, 0.8-1.2% of Si, 1.4-1.8% of Mn, 0.9-1.3% of Cr, 0.4-0.6% of Cu, 0.03-0.05% of Ca, 0.06-0.08% of Mg, 0.0015-0.003% of B, 0.08-0.14% of Ti, 0.02-0.04% of Nb, 0.02-0.03% of Y, 0.015-0.025% of Nd, P less than or equal to 0.03%, S less than or equal to 0.03% and the balance of iron and impurities. The excavator silicon-manganese alloy steel bucket tooth cast disclosed by the invention has the advantages of being added with Ca, Mg and rare earth elements, namely Y and Nd, purifying the molten steel, thinning the crystal grains, improving the form and distribution of impurities and realizing the comprehensive strengthening of an alloy steel, thereby enhancing the abrasion resistance of bucket teeth and prolonging the service life of the bucket teeth. According to the invention, a reasonable heat treatment process, appropriate annealing treatment, quenching and tempering are adopted, therefore the rigidity property and impact resistant property of the alloy steel can be outstandingly enhanced.

An installation, connection and reinforcement device for a building steel structure, the invention relates to the technical field of steel structures, the shell is arranged on the connecting part of the beam body and the column body through the open end cover on the front side; the left and right sides of the shell on the upper side of the beam body Slanted wedges are inserted symmetrically; screw rods are vertically fixed on the opposite surfaces of the slanted wedges, and the ends of the screw rods on the left and right sides are respectively inserted into the left and right ends of the internally threaded pipe through screw thread rotation, and the middle part of the internally threaded pipe is fixed A worm is provided, and the upper side of the worm is meshed with a worm wheel. After the upper side of the worm wheel moves through the upper side of the housing, it is arranged in the middle of the shaft seat through the rotation of the rotating shaft. The front end of the rotating shaft passes through the front side of the shaft seat. , the fixed connection has a No. 1 hand screw; the connection between the beam and the column is reinforced to effectively prevent the brittle fracture of the welded part of the beam and column when the steel structure beam is under too much force, which will cause the column to deform or even collapse. At the same time, increase Compressive and seismic performance of beam and column joints.

The invention discloses an aluminum alloy aluminum bar. The aluminum alloy aluminum bar comprises, by weight, 0.45%-0.55% of Mg, 0.2%-0.4% of Si, less than 0.1% of Fe, less than 0.1% of Cu, less than 0.1% of Mn, less than 0.1% of Zn, and the balance Al. When the aluminum alloy aluminum bar is used for manufacturing an aluminum lamp, a mold is made of H13 steel and comprises a bottom mold body, a middle mold body and a face mold body; the bottom mold body conducts primary feeding, flow guiding is carried out through five holes, the middle mold body conducts secondary feeding, and flow guiding is carried out through eight holes; aluminum materials are distributed into a welding chamber after being fused and are extruded out through an extrusion working belt, the mold is heated through a decreasing heating method and is heated to 510 DEG C at first, and heat is preserved for 0.5-1.5 h; and then, the temperature is lowered to 450 DEG C, heat is preserved for 1.5-2.5 h, an aluminum bar product is obtained, after being machined, the aluminum bar product is manufactured into a lampholder and a lamp barrel, and thus the aluminum lamp is obtained. By means of the aluminum alloy aluminum bar, the service life of the mold can be prolonged, and the yield of the aluminum lamp is increased.

The invention provides a forming process of a corrugated elastic piece and a corrugated elastic piece, and relates to the field of clutch elastic pieces. The forming process of the corrugated elasticpiece comprises the following steps: making a soft 65-Mn blank into an elastic piece blank; carrying out quenching treatment on the elastic piece blank; carrying out low-temperature tempering treatment on the quenched elastic piece blank; putting the elastic piece blank subjected to low-temperature tempering into a mould, heating the elastic piece blank, and extruding the elastic piece blank to form corrugation by using the mould; and carrying out punching treatment on the corrugated elastic piece blank. By means of the process, the soft 65-Mn blank can be thermally formed into the corrugatedelastic piece, and the corrugated elastic piece is used for relieving the problems that a corrugated elastic piece has small corrugation bending angle, large stress, and high occurrence rate of the corrugation height attenuation in the forming process in the prior art. The corrugated elastic piece is manufactured and formed by adopting the forming process of the corrugated elastic piece.

The invention discloses a cast steel deoxidized alloy and a processing method and a use method of the cast steel deoxidized alloy, and belongs to the field of cast steel molten steel smelting. The deoxidized alloy comprises, by mass percent, 15-25% of Re, 8-20% of Ca, 5-15% of Ba, 5-20% of Ti, 5-20% of Zr, 5-20% of Si, 0.5-3% of Mg and the balance Fe. The deoxidized alloy is prepared by adopting afusion casting method, the fusion casting method is suitable for casting ordinary carbon steel, alloy steel, stainless steel and other cast steel, the content of oxygen in the cast steel can be effectively reduced, the harmful effects of oxygen on the content of the cast steel are reduced, and the cast steel product quality is improved.

The invention discloses a low-carbon multi-component alloy steel for an excavator bucket tooth. The alloy steel comprises 0.20-0.26wt% of C, 0.4-0.6wt% of Si, 0.6-1.2wt% of Mn, 0.5-0.8wt% of Cr, 0.4-0.6wt% of Mo, 0.2-0.3wt% of Cu, 0.8-1.5wt% of Ni, 0.08-0.12wt% of Ti, 0.04-0.06wt% of Y, 0.02-0.04wt% of Ce, 0.02wt% or less of P, 0.02wt% or less of S, and the balance Fe and impurities. The micro-alloying treatment of trace elements comprising Mo, Cu, Ti, Ni, Y, Ce and the like increases nucleation and further refines crystal grains, so the number, the size and the form distribution of carbides are effectively controlled, included slag is deteriorated, the metallurgical quality and the comprehensive wear resistance are improved, and the comprehensive performances and the service life of the alloy steel are maximally improved. The adoption of a reasonable heat treatment technology, appropriate annealing treatment and appropriate quenching tempering substantially improves the hardness and the impact resistance of the alloy steel.