259results about How to "Reduced dimensional accuracy" patented technology

The invention discloses a multi-station continuous hot stamping production line and method. The production line comprises a material loading table, a feeding robot, a press unit, a material conveying robot, a quenching device, a material unloading robot and a conveyor belt which are arranged in sequence. The press unit comprises a heating device, a mould device and at least one press used for installation of the mould device; the heating device is used for wholly or locally heating a prefabricated blank to obtain a hot blank, and the mould device is used for conducting stamping forming, pressure maintaining setting and trimming and punching on the hot blank to obtain a hot stamped part. The rapid heating, stamping forming, pressure maintaining setting, trimming and punching and quenching can be continuously completed, so that the heating efficiency is improved, and the transportation process before punching of the hot blank is also avoided. For steel plates, stamped parts are blanked at a high temperature, increasing of cutting difficulty caused by generation of a martensitic structure at normal temperature is avoided, the blanking force is reduced, and the optimal blanked edge can be obtained.

The invention discloses an alloy liquid extrusion casting forming device which comprises a hammerhead (1), a static die (2), a movable die (3) and a pouring slot (4). The device adopts the technical scheme that a declined and downward funnel-shaped pouring slot occupied by both the movable die and the static die arranged respectively by half is arranged on the parting plane on one side of a vertical die casting mould; a cylinder chamber type feed liquid chamber and the piston type hammerhead with a sealing knife is arranged on the static die; the hammerhead is controlled to be pushed up, and simultaneously the sealing knife seals the pouring slot. Firstly, feed liquid is filled into the a die cavity at high speed with low pressure, then the semisolid feed filled into the die cavity is extruded at low speed with high pressure, and the semisolid feed is gradually condensed to be formed under high-pressure low-speed extrusion. The alloy liquid extrusion casting forming device and the process method thereof integrate full casting functions of low-pressure filling and high-pressure extrusion into a whole, ensure that forming of alloy casting achieves the purposes of no gas entrapment, no cast seam, no mis-run, no forging crack, no fash, compact texture, fine crystal grain, high mechanical property, capability of performing thermal treatment and sealing, high dimensional accuracy, energy saving and low cost.

The invention belongs to the technical field of ring rolling forming and particularly relates to a rolling production method for an integral aluminum alloy ring of the super-large diameter. According to the technical scheme of the invention, a ring rolling forming technology is adopted, and through control over the rolling deformation temperature, the diameter increasement rate, the radial and axial feed rates, the radial and axial rolling reductions, the rolling ratio, the core roller diameter and the ring rolling heating number of an aluminum alloy ring piece of the super-large specification, the stable and continuous rolling process of the integral aluminum alloy ring of the super-large diameter is achieved, the size precision, the ovality and the radial and axial deformation quantities of the ring piece are effectively controlled, the product quality consistency is improved, the product percent of pass is increased, and technical index requirements of products are met.

The invention relates to a selective laser melting manufacturing process for an annular array blade guide. The process comprises the steps of 1, model segment processing, specifically, an annular array blade guide three-dimensional model is equally divided into multiple sections; 2, material selection and setting of process parameters; 3, determining of a placing mode and designing of a support structure; 4, correcting of the size precision; 5, selective laser melting forming; 6, after-treatment, specifically, parts together with a base plate are placed into a vacuum heat treatment furnace, warm is kept for one hour at the temperature of 800 DEG C to eliminate residual stress, and then the parts are cut and the support structure is removed; and 7, welding, specifically, all the segmented parts are fixed on a welding fixture and welding is carried out to obtain an integral annular array blade guide part in an argon-arc welding or laser welding mode. The part size precision, stress deformation and surface roughness are well controlled in the process, mechanical performance of the parts is superior to traditional castings, the manufacturing cycle is short, and the efficiency is high.

A valve timing regulation device having a first rotating body co-rotating with a crankshaft; a second rotating body integrally fixed to an intake or exhaust camshaft; a first hole radially penetrating through a shoe formed inside the first rotating body; a second hole formed in the shoe, intersecting with the first hole; a coil spring pressing a lock pin received in the first hole to engage the lock pin with a recess formed in the outer periphery of the second rotating body; and a shaft inserted in the second hole for preventing jumping out of the coil spring.

The invention relates to shuttering hardening agents. The shuttering hardening agents mainly include, by weight, 10-15% of hexahydrate crystallization of aluminum chloride, 22-25% of dihydrate flaky calcium chloride, 1.5-2% of anhydrous boric acid, 0.1-0.15% of permeating agents and the balance clear water. The hexahydrate crystallization of aluminum chloride and the dihydrate flaky calcium chloride serve as the main materials of the hardening agents, so that the defect that the work conditions are seriously worsened as ammonium chloride is used as the main materials of shuttering hardening agents is fundamentally overcome, and the other properties are better than those of the ammonium chloride hardening agents. The shuttering hardening agents have the characteristics of being high in hardening speed, shortening the process and shortening the production period, avoid environmental pollution and obviously improve economic benefits.

The present invention provides a metal precision gear and a gear mechanism, which have high hardness, high strength, high surface smoothness, and processability by using a new material gear that is not found in conventional resin molded gears or tool steel metal gears. Excellent high-precision metal precision gears and gear mechanisms. The gear is composed of vitreous metal alloy composed of Fe, Co, Ni, Cu, Ti, Zr, and Hf, which are mainly composed of iron group elements. A disordered structure with broad peaks and no regularity forms a precision gear with a modulus of 0.2 or less.

The invention discloses an integral riveting tool for an I-shaped automobile thrust rod body and a riveting method of the integral riveting tool. The tool comprises an upper installing plate, a lower installing plate, a floating plate, upper riveting dies and lower riveting dies, wherein the upper riveting dies and the lower riveting dies are arranged on the upper installing plate and the lower installing plate correspondingly, and the two upper riveting dies and the two lower riveting dies are arranged. The tool further comprises two ball head sliding bases connected to the floating plate in a sliding manner, and two equal-height blocks arranged on the floating plate. Two sliding base power cylinders are further fixedly connected to the floating plate. Under driving of the two sliding base power cylinders, the two ball head sliding bases can move close to each other or away from each other relatively along the floating plate. The two ball head sliding bases can drive two ball heads to be connected to the two ends of a pipe in a sleeving manner. The floating plate is further provided with a vertical power cylinder, the lower riveting dies penetrate the floating plate, the floating plate can move back and forth in the vertical direction under the action of the vertical power cylinder, and hydraulic cylinders or air cylinders are adopted as the sliding base power cylinders and the vertical power cylinder. Through the integral riveting tool and the riveting method, the quality of the thrust rod body is guaranteed, and integral riveting can be finished at a time.