33results about How to "Reduced machinability" patented technology

The invention discloses a hole-machining tool with an independent drill tip in center. The hole-machining tool with the independent drill tip in center comprises a tool body and the drill tip, the drill tip comprises an inner drill tip and an outer drill tip which are independent from each other, the outer drill tip is arranged on the tool body, the inner drill tip is arranged at the center of theouter drill tip in a penetrating mode and is arranged on the tool body, and the cutting depth of the inner drill tip is larger than the cutting depth of the outer drill tip. The drill tip is composedof the inner drill tip and the outer drill tip, the inner drill tip and the outer drill tip sequentially cut into a workpiece in a layered mode along the cutting depth direction, the inner drill tipcuts into the workpiece stably and then the outer drill tip cuts into the workpiece, so that the time for the drill tip to cut into the workpiece is prolonged and the stability of the drill tip duringdrilling into the workpiece is greatly improved; due to the fact that the inner drill tip is independent from the outer drill tip, the inner drill tip is provided with a small drill tip angle, the outer drill tip is provided with a large drill tip angle, the tool can be prevented from drilling excessively fast in the cut-in process, so that excessive extrusion to cutting edges by cut chips can beprevented, and the stability of the tool during cutting into the workpiece is improved; and the inner drill tips can be interchanged in batches, flexibly combined and installed on the outer drill tip, so that the inventory of hole drilling tools is greatly reduced.

The present invention provides a cold heading steel, a cold heading steel ladle furnace refining process and a cold heading steel production process. The cold heading steel comprises the following chemical components by weight: 0.19-0.22% of C, less than or equal to 0.10% of Si, 0.75-0.90% of Mn, less than or equal to 0.025% of P, less than or equal to 0.030% of S, more than or equal to 0.02% of AlT, less than or equal to 0.20% of Cr, less than or equal to 0.20% of Ni, less than or equal to 0.20% of Cu, and the balance of Fe. According to the present invention, in the cold heading steel production process, application of aluminum to carry out deep deoxidation, silicon calcium wire feeding, immersion type nozzle application and other steps are adopted, such that the internal components of the produced cold heading steel are reasonably matched, and especially the combination of the C with the content of 0.19-0.22% and the Si with the content of less than or equal to 0.10% makes the cold heading steel meet strength, toughness and other comprehensive mechanical properties, such that the workability of the cold heading steel at a room temperature is good.

The invention discloses a corrosion-resistant zirconium-tin-niobium alloy for nuclear reactor core, which is composed of the following components in mass percentage: Sn 0.6%-1.5%, Nb 0.1%-0.5%, Fe 0.1%-0.6%, Cr 0.1% ~0.5%, Cu 0.01%~0.3%, Mg 0.005%~0.2%, O 600ppm~1400ppm, the balance is Zr and unavoidable impurities. In addition, the present invention also discloses a method for preparing the zirconium-tin-niobium alloy, the method is: 1. preparing a Zr-Cu-Mg master alloy; 2. preparing a Zr-Nb master alloy; 3. preparing a Zr-Sn-Fe-Cr Master alloy; 4. Preparation of zirconium-tin-niobium alloy. The zirconium-tin-niobium alloy of the invention has excellent corrosion resistance and mechanical properties, and is suitable for cladding materials, grids and other structural components of nuclear reactor fuel rods in nuclear power plants.

The invention relates to the field of the metallurgy of aluminium-based materials and can be used in the manufacture of articles for work in corrosive environments under the weight of heavy loads, including in elevated and cryogenic temperatures. Proposed is a new aluminium alloy having a structure consisting of an aluminium solution, secondary separations and a eutectic phase, formed by elements such as magnesium, manganese, iron, chromium, zirconium, titanium and vanadium. The alloy additionally contains silicon and scandium, an at least 75% share of each element from the group consisting of zirconium and scandium forming the secondary separations with an L12-type lattice in an amount of at least 0.18 vol.% and a particle size of no more than 20 nm, for a given alloying element redistribution.

The invention discloses a hole processing tool with an independent drill point in the center, which includes a cutter body and a drill point. The drill point includes an inner drill point and an outer drill point which are independent of each other. The center of the drill tip forms the core of the outer drill tip, and the depth of cut of the inner drill tip is greater than that of the outer drill tip. The drill tip of the present invention is composed of an inner drill tip and an outer drill tip. The inner and outer drill tips cut into the workpiece layer by layer in the cutting depth direction. After the inner drill tip cuts into the workpiece and stabilizes, the outer drill tip cuts into the workpiece again, prolonging the time for the drill tip to cut into the workpiece. Greatly improve the stability of the drill tip drilling into the workpiece; because the inner drill tip is independent of the outer drill tip, the inner drill tip can have a small drill tip angle and the outer drill tip can have a large drill tip angle, and the inner drill tip can have a small drill tip angle. The apex angle of the drill point can prevent the cutting process of the tool from being too fast, and the chips will be excessively squeezed on the cutting edge, which improves the stability when cutting into the workpiece; the inner drill point can be interchanged in batches, and can be flexibly combined and installed on the outer drill point, which greatly reduces the cutting time of the hole drilling tool. inventory.

The invention provides dental use of root canal treatment appliances to improve the flexibility, cutting and / or anti -fracture of dental use of root canal treatment appliances.In the dental root canal treatment appliance (100), the cross -section shape of the first long side position of the end side of the end is composed of the arc (111) and the front line (112)The number of line -shaped parts of the cross -terminal side of the end of the end is formed to increase.

The present invention relates to a low surface gloss styrene resin composition. The composition of the present invention is composed of (A) 80-99.9 weight% of the basic resin comprising rubber-modified styrene resin and (B) 0.1-20 weight% of syndiotactic polystyrene, the matting agent. The composition also includes (C) hydrogenated styrene block copolymer comprising styrene block and butadiene rubber block as a compatibilizer by 0.1-20 weight% for the total weight of the low surface gloss styrene resin composed of (A) the basic resin and (B) the matting agent and additionally includes (D) a plasticizer by 0.1-30 weight%. The composition of the present invention has excellent weatherability and impact-resistance in addition to the low surface gloss properties, so that it can be applied in various products, particularly exterior products for structures such as sidings and window frames, etc.