126results about How to "Consistent hardness" patented technology

The invention discloses a flux-cored alloyed ductile cast iron homogeneous gas-welding wire which consists of H08A steel strip and alloyed flux-cored powder cladded in the H08A steel strip, and the flux-cored powder comprises the components based on the weight percentage: 10-20% of graphite, 50-60% of 75 Si-Fe, 5-8% of Ni, 2-5% of Ti, 3.8-6% of Mg, 0.8-2.5% of Bi, 1-2.5% of Zr, 2.0-4.5% of Ba, 1.5-2.8% of Ce and 4-6% of RE, and the total weight percentage is 100%. The invention also discloses an electric welding rod, a flux-cored welding core of which consists of the H08A steel strip and the alloyed flux-cored powder cladded in the H08A steel strip, and the coating applied on the welding rod comprises the components based on the weight percentage: 5-11% of marble, 10-20% of dolomite, 5-15% of potassium feldspar, 5-15% of fluorite, 8-16% of graphite, 15-25% of 75 silicoferrite, 6-10% of 30 calcium silicon alloy, 4-6% of aluminium powder, 3-7% of ferrous powder, 5-15% of white slime, 0.5-1.5% of NaCO3, 1-3% of RE-Y, and the total weight percentage is 100%. The gas-welding wire or the electric welding rod can realize normal temperature gas welding, cold welding or low temperature preheating welding.

The present invention discloses surface quenched chrome plated wound and welded roller making process, which includes the steps of hot winding, bottoming welding and processing bevel, coarse turning, surface quenching, semi-finish turning, assembling welding, finish machining and post-treatment. The process of the present invention is suitable for making roller of 500-1200 mm diameter, 25 mm wall thickness and 2050-2200 mm length, and roller surface is treated through quenching, sand blasting to roughen and chrome plating. The present invention has the advantages of saving in material, low making cost and short production period.

The invention discloses a concentrate mixed granular material for breast-feeding female bamboo rats and a preparation method of the concentrate mixed granular material. The concentrate mixed granular material is prepared from the following components in percentage by weight: 40-55% of corn, 5-15% of wheat, 8-15% of soybean meal, 1-8% of fish meal, 5-10% of rice bran, 5-10% of brewer's grain, 1-5% of bagasse powder, 1-5% of cane molasses powder, 1-5% of bamboo leaf powder, 1-3% of monocalcium phosphate, 0.5-1% of shell powder, 0.1-0.5% of edible salt, 0.1-0.2% of compound vitamin, 0.1-0.2% of trace element premix, 0.3-0.5% of lysine, 0.1-0.2% of threonine, 0.05-0.1% of Chinese herbal additives, and 0.5-1% of loess. The concentrate mixed granular material is capable of meeting the nutritional requirements of the breast-feeding female bamboo rats to keep the disease resistance and the milk yield of the rats at the optimal level, and also capable of improving the growth performance and the survival rate of the breast-fed young bamboo rats; besides, the raw materials are convenient to get and the preparation method is simple.

The invention discloses a fireproof fiber board and relates to the technical field of fireproof material manufacture. The fireproof fiber board is prepared from the following raw materials in parts by weight: 100-120 parts of aluminum silicate fibers, 9-12 parts of silicon-aluminum sol, 12-15 parts of tetraethyl orthosilicate and 8-10 parts of additives. Compared with the prior art, the fireproof board is small in volume weight and consistent in surface and interior hardness, and can be processed into various products by use of mechanical equipment; the products processed from the fireproof fiber boards are high in dimensional accuracy.

The present invention relates to a cast iron electrode with low-carbon steel core wire, and is characterized by that the extrior of the low-carbon steel core wire is covered with a layer of coating which is composed of 30-34% of reduced iron powder, 13-21% of marble flour, 13-17% of ilmenite, 4-8% of ocher powder, 2-8% of clay, 1-4% of potassium ferrocyanide and other 12 kinds of raw materials. Said electrode can meet requirements for welding several cast iron mother materials.

The invention relates to the field of building construction. In order to solve the problem that the perpendicularity of a pile hole is low as a result of a locking hammer and an inclined hole, the invention provides a construction method for an impact-cone concrete pile. The stress face of an impact hammer is uniform, so that the perpendicularity of the pile hole is relatively high. The technicalscheme is as follows: the construction method comprises the following steps: surveying and setting out; positioning and drilling ahead; boulder blasting; impact holing, impacting again after hornstonebackfilling when a same horizontal section in the pile hole includes boulders and soil mass at the same time; mounting a steel reinforcement cage in the hole; and pouring concrete in the hole. The stress face of the impact hammer is uniformly distributed when the same horizontal section in the pile hole includes boulders and soil mass at the same time by backfilling the hornstones, the conditionthat the perpendicularity of the pile hole is reduced as the result of the locking hammer and the inclined hole is avoided, and the perpendicularity of the pile hole is ensured to further guarantee the quality of the impact-cone concrete pile.

A process of the grinding ball is disclosed in the invention. The square steel or the round steel is heated uniformly in the heating-furnace and forged into ellipse shape in the spacing mould by pneumatic hammer. Then the elliptical material is rolled to shape by the spiral roller and is treated in the hot water. The process is proper to producing grinding balls of all kinds of diameters.

A cerium-containing leadless free-cutting zinc-copper-nickel alloy material comprises the chemical elements in percent by mass: 40-42% of Zn, 9-11% of Ni, 0.5-0.8% of Co, 0.15-0.18% of B, 0.05-0.08% of Mn, 0.03-0.05% of Ce, 0.05-0.08% of As, 0.08-0.1% of Hf, and the balance Cu. The zinc-copper-nickel alloy possesses the characteristics of excellent corrosion resistance and cold/hot processing formability originally owned by zinc-copper-nickel alloy; by adding B, Ce, Hf and other elements, the copper alloy is improved in cutting performance and electric conductivity, and the lead pollution problem is solved; and by reasonably controlling the processing temperature after casting and taking waste copper as a raw material, the hardness of the core part and the hardness of the surface are basically consistent, and the alloy quality is uniform. An employed refining agent is used for casting production, is capable of reducing the porosity degree of a casting by 1-2 degree and enabling the oxide inclusions to be around second grade, and helps to obviously improve the yield.

The invention discloses a welding material for quickly welding and repairing defects of large-sized QT500-7 nodular cast iron parts, comprising powder components including, by weight percent, from 30 to 35% of Fe2O3, from 25 to 30% of Al, from 1.4 to 1.6% of Na2CO3, from 4 to 6% of Na2B4O7, from 4 to 6% of CaF2, from 5 to 8% of CaO, from 0.5 to 1.5% of SiO2, from 5.0 to 7.0% of graphite, from 4.0 to 5.0% of 75Si-Fe, from 1.0 to 2.0% of 75Mn-Fe, from 0.5 to 2% of Ni, from 0.1 to 0.3% of Bi, from 1.0 to 2.0% of 60Si-Ca, from 0.3 to 0.8% of RE-Mg and from 7 to 10% of Q14 pig iron which are uniformly mixed. The total weight percent of the powder components is 100%. The invention further discloses a method for quickly welding and repairing the defects of the large-sized QT500-7 nodular cast iron parts by the aid of the welding material. By the aid of the material and the method, the QT500-7 nodular cast iron parts can be quickly welded and repaired at room temperature, probability of chills and cracks can be effectively, and ingredients, structures and colors of weld joints are basically consistent to those of the nodular cast iron parts.

The invention discloses an integral abrasion resistant anti-ageing comb-shaped carrier roller for a belt conveyer. The integral abrasion resistant anti-ageing comb-shaped carrier roller comprises a carrier roller shaft, a carrier roller cylinder and an outer ring, wherein bearings are mounted at the two ends of the carrier roller shaft; the bearings are wrapped with the carrier roller cylinder; the carrier roller cylinder rotates around the carrier roller shaft; the outer ring fixed outside the carrier roller cylinder is an integral rubber comb-shaped ring; sealing parts are arranged outside the bearings; crests of comb-shaped ripples of the integral rubber comb-shaped ring are circular horns; cross sections of the ripples are isosceles triangles; a plurality of groups of comb-shaped ripples are formed on the integral rubber comb-shaped ring; and each group has 2 to 5 ripples. According to the integral abrasion resistant anti-ageing comb-shaped carrier roller for the belt conveyer, the carrier roller shaft, the bearings, the sealing parts, the carrier roller cylinder and the integral rubber comb-shaped ring are manufactured or purchased according to size and precision requirements, and then, all the parts are assembled into the integral abrasion resistant anti-ageing comb-shaped carrier roller for the belt conveyer; the outer layer is an integral structure, so that the defect that once one external part is damaged, the other external parts are damaged is avoided; and the structure is reasonable, the stress is uniform, a belt is not damaged, the sealing performance is good, the integral abrasion resistant anti-ageing comb-shaped carrier roller is abrasion resistant, corrosion resistant and anti-ageing, the service life is long, the cost is low, and the changing and utilization are convenient.