37results about How to "Reduce molding defects" patented technology

The invention provides a crystal jade-like ceramic and a production method thereof. Firstly, magnesium, aluminum, barium, strontium, calcium and lithium serving as main components are synthesized into a composite base ceramic material; and then, the composite material and additive are used as raw materials and are prepared into the crystal, smooth and jade-like ceramic with high strength and highhardness by adopting the production processes such as sol-gel injection molding and surface polishing process and the like.

The invention discloses a high-gloss three-dimensional texture material and a preparation method thereof, which consists of the following components in parts by weight: 70-90 parts of ABS resin, 5-20 parts of three-dimensional skeleton filler, 2-5 parts of compatibilizer, and light stabilizer 0.2-0.5 parts, 0.2-0.5 parts of antioxidant, 0.5-1 parts of lubricant, 3-5 parts of metal texture toner. The invention adopts a three-dimensional skeleton filler with a high aspect ratio as filling, which forms a spatial structure skeleton during the injection molding process, plays an orientation and guiding role for the flake metal texture toner, and the prepared material has the effect of changing the visual angle. The high-gloss three-dimensional texture material prepared by the invention has a good three-dimensional texture effect, and at the same time, the texture three-dimensional effect has the characteristics of angle change, and the injection molded parts of the material have good glossiness and low molding defects. The high-gloss three-dimensional texture material of the invention can be widely used in appearance materials in the fields of automobiles and electronic appliances.

The invention relates to a steel pipe and steel pipe manufacturing equipment, and discloses a cold-drawing roll-welded steel pipe with small diameter-thickness ratio and combined die rotating drawing type pipe rolling equipment. The cold-drawing roll-welded steel pipe with small diameter-thickness ratio is characterized in that the external diameter of a steel pipe (9) is D, the wall thickness of the steel pipe (9) is t, the diameter-thickness ratio (D / t) of the steel pipe (9) is not greater than 21, and the wall thickness of the steel pipe (9) coiled from a steel plate (8) is not less than 4mm. The equipment comprises a conveying roller device (1), a combined die rotating device (2) and a traction device, wherein the combined die rotating device (2) comprises more than one arc gears (21). According to the invention, the radial constraining formation method and the tunnel die rotating technology are adopted, so that the tensile stress on the outer side basically counteracts the pressure stress constrained by the length, the pressure stress on the inner side is multiplied, the formation defect that fibrous cracks are caused on the outer side of the steel plate due to stretching can be reduced, and the steel plate is secondarily reinforced due to multiplication of pressure on the inner side of the steel pipe.

The invention discloses a typical path planning method for 3D (three-dimensional) printing of continuous fiber reinforced composites and belongs to the field of rapid prototyping of the composites. Inthe method, a three-dimensional model is built by using CAD (computer aided design) modeling software according to actual size requirements of forming components and is subjected to slice stratification by the aid of the three-dimensional software to acquire profile and slice information; the degree of path bending is judged and corresponding path planning mechanisms are started, and with the help of the jump point processing mechanism, jump points can be accurately located and the action of the jump points is completed; fiber interlayer conversion without breakpoint is realized by using an interlayer path planning mechanism, and high quality and high efficiency three-dimensional printing new path of the continuous fiber reinforced composites is realized. In the method, the printing pathwith the least breakpoints is planned out, and mechanical property of the continuous fiber reinforced composites is guaranteed; forming defects in the bending of continuous fiber are effectively reduced, binding force of the continuous fiber in the bending is improved, and integral performance of the forming components is improved.

The invention relates to a corrugated steel plate and a manufacturing process thereof, and discloses a different-thickness corrugated steel plate with an intensified corner and a manufacturing process thereof. The different-thickness corrugated steel plate comprises a flat and straight unit and a corner unit (1), and the steel plate thickness t1 of the corner unit (1) is smaller than the original steel plate thickness t0 of the flat and straight section, wherein t1 and t0 meet the formula: 99.5%*t0>=t1>=89.5*t0. The manufacturing process comprises the steps that the area of the corner unit (1) is pressed to be thinner, a flat steel plate with a part of area being thinner is placed into a corrugated steel plate die, the die presses downwards, and then the corrugated steel plate is formed. According to the manufacturing process of the corrugated steel plate, the area of the corner unit of a common steel plate is pre-pressed to be thinner, and then the forming of the whole steel plate is conducted, so that the probability of occurrence of forming defects of fibrous cracks of the corner part of the corrugated steel plate in the forming process is reduced, the thickness of the corner part of the prepared steel plate is smaller than the thickness of the flat and straight section of the steel plate, the corner part of the steel plate is more compact relative to the flat and straight area, and the structural strength is higher.

The invention relates to the technical field of metallurgy, and specifically discloses a low-carbon aluminum-killed cold heading steel and a production method thereof. The composition of the cold heading steel is: C 0.06~0.09%, Mn 0.30~0.50%, Si 0.03~0.06%, P≤0.015%, S≤0.010%, Al 0.020~0.040%, the balance is Fe and unavoidable The low-carbon aluminum-killed cold-heading steel is prepared through steelmaking, continuous casting, hot-rolling and spinning processes. The present invention makes the mechanical properties of the prepared cold heading steel satisfy the tensile strength Rm≤450N / mm through composition adjustment and process optimization 2 , the shrinkage rate Z≥70%, the cold heading steel produced fully meets the requirements of use, and has stable mechanical properties, which can be popularized and used on a large scale.

The present invention relates to a copolymer polyester resin and a molded product using the same and more specifically to a copolymer polyester resin that contains 10-80 mol% of 1,4-cyclohexane dimethanol, 0.1-50 mol% of a diol compound expressed as HO-R6CR7-R4R1R5-COHR2R3 (where R1 is an alkyl group with a carbon number of 0-10,and R2-R7 are hydrogens or alkyl groups with a carbon number of 1-10), and ethylene glycol as the remainder so that the sum of the entire diol composition is 100 mol% relative to aromatic dicarboxylic acid. The copolymer polyester resin of the present invention enables reduction of cycle time and improvement of product moldability and prevention of PET bottle deformation during mold processing with a heat-shrinking label by complementing low temperature shrinkage, maintaining a high shrinkage rate, and reducing shrinkage stress.

The invention discloses a frame structure for a pedal motorcycle, which comprises a frame main girder, a lower right pipe and a lower left pipe which are symmetrically arranged, and a right pipe and a left pipe which are symmetrically arranged, wherein front ends of the right pipe and the left pipe are connected through a stamping part with a U-shaped cross section; the opening of the stamping part with the U-shaped cross section is downwards; the stamping part with the U-shaped cross section coats the right pipe and the left pipe into the stamping part and connects the right pipe and the left pipe into a whole; and a left reinforcement tube and a right reinforcement tube for connecting the left and the right are welded between the front end of the right pipe and the U-shaped bottom of the lower right pipe, and between the front end of the left pipe and the U-shaped bottom of the lower left pipe respectively. The frame structure for the pedal motorcycle reduces the difficulty and the cost of the manufacturing technology of a vehicle frame, has better strength, is more convenient to assemble, provides a larger space for assembling an engine, can meet the space demand for assemblingthe engine without performing secondary processing on the vehicle frame, and particularly further reinforces the rigidity and the strength of the frame by making the lower left pipe and the lower right pipe form a quadrangular frame structure through arrangement of the left reinforcement tube and the right reinforcement tube.

The present invention relates to a resin molding device and a method of manufacturing a resin molded product for verifying whether or not a substrate supplied to a molding die is positioned normally. The device comprises: a forming mold (24), which has a first mold (23) and a second mold (12) arranged opposite to each other; a substrate supply mechanism (10), which supplies the substrate to the mold surface of the first mold (23) The positioning mechanism locates the positioning object (5) including at least the substrate; the mold clamping mechanism closes the forming mold (24); the camera (11), when the forming mold (24) is opened, Can be disposed between the first mold (23) and the second mold (12); Recognizable fiducial marks (29, 30), the camera (11) shoots the target object (5) and the fiducial mark (29, 30) after positioning, and the processor The image data of the mark (29, 30) is used to determine whether the object (5) is positioned normally.

The invention discloses a preparation method of a composite material shaft. The method comprises the following steps: (1) dipping aramid fiber woven cloth or carbon fiber cloth in thermosetting resinto obtain a pre-dipped material; (2) winding the pre-dipped material on an expanding shaft; and (3) enabling a cylindrical cavity and the expanding shaft, on which the pre-dipped material is wound, tobe assembled, rotating the rotating arm of the expanding shaft to send the material into a hot-pressing tank to mold, opening the tank finally, shrinking the expanding shaft, demolding and completingthe preparation of the composite material shaft. The composite material shaft is prepared through adopting a vacuum inner expansion molding mode, bubbles in a shaft body can be quickly and effectively eliminated in a vacuum state, and molding defects are reduced; inner expanding extrusion can guarantee that woven cloth layers are uniformly distributed, and the defect that resin and fiber are notuniformly distributed cannot appear; compared with existing winding molding, the composite material shaft can further bear relatively great tension-compression stress when transmitting a large torquewhile a traditional winding molding transmission shaft cannot bear great tension stress.