36results about How to "Reduce casting stress" patented technology

The invention relates to a hollow billet and a manufacturing method thereof, and especially relates to a large-size and high-strength super hard hollow billet and a manufacturing method thereof. The purpose of the invention is to solve the problems of low yield, large production workload and difficult process control of casting of aluminum alloy hollow ingots prepared in the prior art. The large-size and high-strength super hard hollow billet comprises Si, Fe, Cu, Mn, Mg, Cr, Zn, Ti, B and Al. The manufacturing method comprises the following steps: 1, weighing; 2, smelting; 3, refining and casting of melt; and 4, molding. The method is mainly used for manufacturing the large-size and high-strength super hard hollow billet.

A method, with an associated system, for providing a cast component comprises annealing heat treatment to reduce casting stresses; initial machining the cast component; initial nondestructive testing (NDT) the machined cast component to identify NDT indications in the cast component; treating and removing NDT indications from the machined cast component; weld upgrading the treated and removed NDT indications from the machined cast component, the weld upgrading providing stress relief; intermediate nondestructive testing the cast component to identify NDT indications in the weld upgraded cast component; normalizing and temper heat treatment of the cast component; second intermediate nondestructive testing the cast component to identify NDT indications in the cast component; further treating and removing NDT indications from the cast component; post-normalization and temper weld upgrading the treated and removed NDT indications providing stress relief; and final nondestructive testing the cast component to identify NDT indications in the cast component.

The invention provides a method for improving the metallurgical quality of large-scale 2000-series aluminum alloy ingots. The method is suitable for large-scale flat ingots of 520mm (thickness)×1620mm (width) and large-scale round ingots with a diameter of 1000mm. The method is to jointly apply ultrasonic waves and electromagnetic waves to the aluminum liquid (for example, to the aluminum liquid in the front tank) during casting, and select the ultrasonic frequency, electromagnetic wave coupling parameters, casting temperature, casting speed, and water flow rate according to the alloy composition. The method can effectively reduce the casting stress of large-scale ingots, reduce cracks, reduce the degree of component segregation of ingots, reduce microporosity, avoid cracking of ingots, and improve the casting molding rate.

The invention provides a heat treatment method for a magnesium alloy used in large-scale satellites, and belongs to the technical field of heat treatment of magnesium alloys. The invention uses high-rigidity and heat-conducting tooling, which can ensure that the tooling itself does not deform during heat treatment and shape correction, and is easy to strictly control the deformation of the casting during the stress release process, and then strictly control the size of the casting. Heat conduction can ensure the uniformity of tooling and casting temperature and avoid new deformation; if the temperature drops too much during the unmounting process, the temperature inconsistency between the first unmounting and the last unmounting part and the difference in stress state will cause new deformation of the casting . The invention controls the temperature drop at 50°C and 20°C, which can prevent new deformation.

The invention provides a high-strength magnesium alloy large-scale thin-walled casting heat treatment process, which is characterized in that it includes the following steps: a. Preliminarily scribing the large-scale thin-walled casting and processing at least one reference plane; b. Solid solution treatment is carried out after the rigid and easy-to-heat-conducting tooling is assembled; c. Aging treatment is carried out after the solution-treated castings and high-rigid and easy-to-heat-conducting tooling are assembled with high external force. If the dimensional accuracy requirements are not met, local high external force loading is carried out for secondary aging. The present invention can eliminate the large thin wall caused by casting stress by using special tooling during solution treatment and aging treatment, and adjusting parameters such as heating rate, holding time, quenching air rate, and dismounting temperature drop of solution treatment and aging treatment. Component deformation, cracks, and increase the strength.

The invention belongs to the technical field of casting, in particular to an electromagnetic semi-continuous casting device for alloy ingots with high casting stress and an ingot casting method using the device. The electromagnetic semi-continuous casting device mainly includes a shunt, a mold and a dummy head, and the mold includes a mold inner sleeve, a cold water tank, a coil and a bottom bracket. Under the condition that the amount of cold water is constant, a cold water tank with double rows of different-diameter cross water holes is used to make the first cold water appear double water streams, thereby reducing the cooling rate of the alloy melt at the contact point between the first cold water and the inner sleeve of the crystallizer , thereby reducing the chance of cracking. Through the setting of the distance between the double drainage holes, the cooling intensity during casting can be controlled, which helps to improve the surface quality of the ingot. The use of the diverter groove in the device of the present invention can also effectively reduce the temperature gradient and casting stress at the center and edge of the slab, thereby reducing the possibility of cracking of the ingot. The electromagnetic semi-continuous casting device in the present invention can also realize the production of products within a certain specification range by changing the specifications of the mold inner sleeve.

The invention discloses an aluminum alloy laminar flow distribution plane solidification casting device and a casting method thereof, and belongs to the technical field of aluminum alloy ingot blank casting. The device comprises a support. A translation flow distribution mechanism capable of moving horizontally is arranged on the upper portion of the support. A flow control mechanism is arranged at an outlet of the translation flow distribution mechanism. A casting tank is arranged below the translation flow distribution mechanism. A water spraying system and a cooling plate system are arranged below the casting tank. The method includes the steps that the cooling plate system rises into the casting tank, and molten aluminum alloy enters a flow distribution groove and then enters a guide rod sleeve; a second motor is started to control flow of the molten aluminum alloy; a first motor is started, a movable plate drives the flow distribution groove to move horizontally, and the molten aluminum alloy flows to a cooling plate upper plate body in a laminar mode; when an aluminum alloy solidification layer can be supported, a cooling plate oil cylinder is started, and thus the cooling plate system descends; then the water spraying system is pushed in, and sprayed water is cooled; the descending speed of a main oil cylinder is controlled until casting reaches a preset thickness; and after all the cooling is completed, water spraying is stopped, the water spraying system is extracted, ingot castings are taken out, and accordingly casting is completed.

The invention provides a method for manufacturing a large-size heat-treatment aluminum alloy slab ingot capable of being strengthened, and relates to a method for manufacturing the aluminum alloy slab ingot. The method for manufacturing the large-size heat-treatment aluminum alloy slab ingot capable of being strengthened mainly solves the problems that as for an aluminum alloy slab ingot prepared in the prior art, the casting yield is low, and wide and thick slabs with excellent properties cannot be rolled out. The method comprises the first step of material weighing, the second step of smelting, the third step of casting melt preparation and the forth step of molding, and the large-size heat-treatment aluminum alloy slab ingot capable of being strengthened is obtained. By means of the method, according to the prepared large-size heat-treatment aluminum alloy slab ingot capable of being strengthened, the yield strength ranges from 98 N / mm<2> to 120 N / mm<2>, the tensile strength ranges from 182 N / mm<2> to 201 N / mm<2>, and the elongation percentage in a casting state ranges from 9.56% to 14.7%. By means of the method, the large-size heat-treatment aluminum alloy slab ingot capable of being strengthened can be obtained.

The invention discloses a vermicular graphite cast iron glass mold material and a mold preparation method. The vermicular graphite cast iron glass mold material is prepared from the following chemicalelements including3.8%-4.0% of carbon, 1.2%-1.8 % of silicon, 0.1%-0.2% of manganese, less than 0.1% of phosphorus, less than 0.03% of sulfur, less than 0.05% of magnesium, and the balance iron and other unavoidable impurity elements. According to the vermicular graphite cast iron glass mold material and the mold preparation method, the formula of vermicular graphite cast iron is optimized, the degree of graphitization of a vermicular graphite cast iron glass mold blank in the as-cast state is increased, the amount of a pearlite matrix is reduced, and the casting stress is reduced. Besides conventional alloys like ferrosilicon, there is no other alloying element added. The manganese element is self-contained in Q10 pig iron instead of being artificially added, so that the cost of the casting material is greatly reduced. More importantly, due to the small quantity of alloying elements, unpacking is carried out after the casting is naturally cooled to 250 DEG C in a casting system, theamount of pearlite in the as-cast state does not exceed 15%, and it is not necessary to perform high-temperature graphitization annealing at 930 DEG C or above.

The invention relates to a manufacturing process for centrifugal casting of multi-element eutectic high-alloy rolls, and belongs to the technical field of metallurgical rolls. The technical scheme includes that eutectic compositions are selected as materials of a roll working layer, and besides five elements of C, Mn, Si, P and S commonly existing in steel, not less then five alloying elements of Cr, W, Mo, V, Nb, Ti, Al, Cu, B and Mg need to be added into the roll materials to form a multi-element alloying state; carbon content of the roll materials is controlled to be 1.3%-2.8% in mass percent. The manufacturing process is small in solidification temperature range of the eutectic compositions, and particularly suitable for obtaining high-quality castings under the circumstance that feeding conditions are insufficient; the castings are crystallized simultaneously, and optimal in composition uniformity, concentrated cavity shrinkage is formed, metallic yield by casting moulding is high; the metal is solidified at the same time, and casting stress in the process of solidification is minimum; the eutectic compositions in alloy are lowest in melting point, and smelting cost is also low; liquid of the eutectic compositions is best in fluidity; castability is improved, and abrasion resistance and heat resistance are taken into consideration.