56 results about "Gold processing" patented technology

The invention relates to a mandril for a copper alloy pipe planetary rolling mill, which comprises the following components of 35 to 40wt% of nickel, 19 to 21wt% of chromium, 9 to 12wt% of molybdenum, 0.8 to 1.8wt% of manganese, 1.2 to 1.5wt% of titanium, 0.1 to 0.5wt% of vanadium, 0.05 to 0.2wt% of aluminum and the balance ferrum. The mandril material of the invention is an alloy with the nickel as the main material and has the advantages of good high temperature resistance performance, high strength, good flexibility, no invalidation or chap when working at the temperature of 900 to 1000 DEG C for a long time, requirement satisfaction of the temperature of planetary rolling copper alloys, simple preparation technology, easy operation, in particular to the aspects of gold processing, and processing time and cost saving.

The invention discloses a cold drawing welded tube manufacture process for a high-accuracy hydraulic oil cylinder, which sequentially comprises the following steps of longitudinal shearing, roll bending molding, high frequency welding, welding joint treatment, online eddy current testing, sizing cutting, normalization, pinching, surface treatment, cold drawing, annealing, straightening, defect detection and cutting for measurement. The method is quick in processing molding, high in production volume, free of damage on surfaces in cold drawing and high in manufacture accuracy. After cold drawing, bearing capacity of a welded tube is improved by about 60%, and the welded tube is high in tensile strength and good in elongation rate. Follow-up gold processing amount is reduced, utilization rate of steel materials is improved, and manufacture cost is reduced. The cold drawing welded tube can be directly applied to manufacture of high-accuracy hydraulic oil cylinders.

The invention relates to a mandril for a copper alloy pipe planetary rolling mill, which comprises the following components of 35 to 40wt% of nickel, 19 to 21wt% of chromium, 9 to 12wt% of molybdenum, 0.8 to 1.8wt% of manganese, 1.2 to 1.5wt% of titanium, 0.1 to 0.5wt% of vanadium, 0.05 to 0.2wt% of aluminum and the balance ferrum. The mandril material of the invention is an alloy with the nickelas the main material and has the advantages of good high temperature resistance performance, high strength, good flexibility, no invalidation or chap when working at the temperature of 900 to 1000 DEG C for a long time, requirement satisfaction of the temperature of planetary rolling copper alloys, simple preparation technology, easy operation, in particular to the aspects of gold processing, andprocessing time and cost saving.

An apparatus (10) for checking the diameter of an eccentric pin (8') of a small-size shaft (8), for example a shaft for compressors, includes a support (16), a first arm (19) rotating with respect tothe support (16), a second arm (22) rotating with respect to the first, a Vee-shaped reference device (28) carried by the second arm, a measuring device (25,26,24,37,38) associated with the referencedevice, limiting devices (29,29',30,30') for limiting the rotations of the arms and thrust means (33) for keeping the reference device in contact with the pin in the course of the checking.A hydraulicactuator (13) displaces the apparatus (10) from a rest condition to a checking condition, in which the reference device (28) is in contact with the pin (8') to be checked, and vice versa.

The invention relates to a fit-typed die-casting composite bottom pan, comprising an aluminium alloy pan body and a composite bottom sheet which is fit at the bottom of the pan body; the fit-typed die-casting composite bottom pan is characterized in that the pan is formed by the rolling and composing of a composite material sheet and a stainless steel sheet; the composite material sheet is provided with a plurality of circular concave troughs with internally inclined side wall; the bottom of the pan body is provided with a plurality of circular convex ribs which are embedded into the circularconcave troughs; after being fit, the circular concave troughs and the circular convex ribs are rabbeted with each other; the composite material sheet is made of pure aluminium or aluminium alloy or material with the linear expansion coefficient approximate to the aluminium alloy. The invention also relates to a manufacture process used for the fit-typed die-casting composite bottom pan; the manufacture process of the invention is used for preparing the fit-typed die-casting composite bottom pan by the steps as follows: composite bottom sheet preparing, die casting of aluminium alloy pan body,flap edge removing of the pan body, gold processing, fitting, surface disposing, etc. The fit-typed die-casting composite bottom pan has the advantages of firm connection of the composite bottom sheet, high thermal efficiency, good heat-resistance fatigue performance, simple manufacture process, and the like, and is a cooker which is especially suitable for being used for induction cookers.

The invention discloses a method for plating a gold thick layer in a circuit board manufacturing process, which comprises the following steps of: A, firstly, subjecting a circuit board to pattern tin plating, circuit wire etching, solder-mask printing and chemical nickel and gold processing treatments of depositing a nickel layer and depositing a gold layer; B, carrying out the anti-oxidation post treatment of the circuit board subjected to the chemical nickel and gold processing treatments; C, covering a non-gold plated area of the circuit board; and D, after pre-treating the surface of the circuit board, plating the thick gold layer on a lead of the circuit board by a post drawing process. The invention provides a method for plating thick gold layer in the circuit board manufacturing process, which has advantages of pollution prevention, environment protection, gold salt conservation, good quality and easily controllable gold color.

The invention discloses a production system of an environmentally friendly gold ore dressing agent, which comprises a primary batching device, a mixing reaction device, a cooling and solidification device, a secondary batching device and a finished product packaging device connected in sequence, and the mixing reaction device is also connected with a tail gas treatment device. The automatic control system is respectively connected with the primary batching device, mixing reaction device, cooling and solidification device, secondary batching device, finished product packaging device and tail gas treatment device. The purpose of the present invention is to provide a production system of the environment-friendly gold ore dressing agent, which solves the problem that the existing production equipment cannot meet the continuous and efficient production of the environment-friendly gold ore dressing agent.