30results about How to "Low mold requirements" patented technology

The invention discloses a split type SUV rear wheel cover based on weight reduction. The split type SUV rear wheel cover comprises a rear wheel cover body. The rear wheel cover body comprises a first end body, a second end body and a third end body which are sequentially distributed in the horizontal direction. A front supporting end body extending towards the front end of the rear wheel cover body is arranged on the inner side of the first end body. A rear supporting end body extending towards the rear end of the rear wheel cover body is arranged on the inner side of the third end body. A side supporting end body is arranged on the inner side of the second end body and extends between the side ends of the rear wheel cover body, and a corrugated structure is adopted by the side supporting end body in the axial direction of the side supporting end body. According to the split type SUV rear wheel cover based on weight reduction in the technical scheme, compared with the prior art, the rear wheel cover body is divided into multiple parts to be independently machined and treated, so that the requirements of the rear wheel cover body for the production process and molds are reduced in the overall production process; and therefore, the production efficiency of the rear wheel cover body is improved, and the production cost of the rear wheel cover body is reduced.

The invention discloses a vacuum formation preparation method for a yacht. The vacuum formation preparation method for the yacht includes the steps of cleaning, waxing, get coating spraying, lamination, vacuum laying-up, grinding and trimming and mold releasing. On the basis of traditional hand lay-up molding, formation of the yacht is carried out through a vacuum injection process. The vacuum formation preparation method not only has the advantages of traditional and lay-up molding that construction is easy, requirements for a mold are low, and maintenance is easy, but also reduces use of resin in the preparation process, reduces volatile components in the preparation process, is more environmentally friendly, and enables the resin to be distributed more evenly and produced products to be higher in mechanical property, better in waterproof performance and higher in quality.

The invention relates to the field of valve body manufacturing, in particular to a valve body forging method. The valve body forging method saves materials and energy and reduces consumption on the condition of meeting the requirement of customers for product diversification. At first, blank forming is achieved by utilizing free forging for executing the following steps of A, selecting round steel with the weight being 1.15-1.25 times the weight of a finished valve body, riveting the two ends of the round steel, conducting indentation material separation, and forging the round steel into the preset size; B, enabling the two ends of the round steel to get off a table, forging eccentricity of the middle and the two ends, and forging the two ends into 260-degree octagons; C, then utilizing pressing blocks for making octagonal pressure grooves in the two ends into the preset size, and ensuring that flanges and grooves of a green body are within the design size range. Then, final forming is achieved by adopting semi-die forging for executing the following steps of a, forging the middle octagon of the green body in a vertical die buckling and pressing mode; b, after the middle octagon is formed, controlling the height of the flanges at the two ends through cushion blocks and forging the flanges to be rounded; c, finally, trimming the sizes of all parts of the forged piece into the designed sizes.

The invention discloses a sequential pressure boost method after crystallization pressure maintaining and for metal-mould low-pressure casting forming of aluminum alloy automobile chassis cast parts. According to the method, an existing aluminum alloy cast part low-pressure casting process is still adopted at the stages of liquid lift, mold filling and crystallization pressure boost, and the liquid lift pressure, mold filling pressure and crystallization pressure boost pressure are controlled to be 15-21kPa, 25-35kPa and 80-100kPa correspondingly. A sequential pressure boost stage is added between the crystallization pressure maintaining stage and the pressure relief stage. According to structural characteristics of the cast parts and the solidification sequence, multiple characteristic positions are set. After the situation that the characteristic position A starts to be solidified is determined, the crystallization pressure maintaining pressure starts to be increased; after the situation that the characteristic position B starts to be solidified is determined, the pressure boost speed is increased; and after the characteristic position C starts to be solidified, the pressure boost speed continues to be increased to reach 20-40kPa / s till the crystallization pressure maintaining pressure is increased to 310-1000kPa, and then pressure maintaining is carried out till solidification of the characteristic position D is finished. By means of the sequential pressure boost method after crystallization pressure maintaining and for metal-mould low-pressure casting forming of the aluminum alloy automobile chassis cast parts, the solidification feeding effect and the mechanical property of the cast parts are remarkably improved, meanwhile the defects of molten aluminum splashing, casting fin and burrs and the like are avoided, and the requirement for a mold structure and casting-molding mold clamping force is remarkably lowered.

The invention discloses a split type SUV rear wheel cover based on weight reduction. The split type SUV rear wheel cover comprises a rear wheel cover body. The rear wheel cover body comprises a first end body, a second end body and a third end body which are sequentially distributed in the horizontal direction. A front supporting end body extending towards the front end of the rear wheel cover body is arranged on the inner side of the first end body. A rear supporting end body extending towards the rear end of the rear wheel cover body is arranged on the inner side of the third end body. A side supporting end body is arranged on the inner side of the second end body and extends between the side ends of the rear wheel cover body, and a corrugated structure is adopted by the side supporting end body in the axial direction of the side supporting end body. According to the split type SUV rear wheel cover based on weight reduction in the technical scheme, compared with the prior art, the rear wheel cover body is divided into multiple parts to be independently machined and treated, so that the requirements of the rear wheel cover body for the production process and molds are reduced in the overall production process; and therefore, the production efficiency of the rear wheel cover body is improved, and the production cost of the rear wheel cover body is reduced.

The invention belongs to the technical field of multi-layer composite material components and preparation methods thereof, and specifically discloses a VIMP preparation method of a composite material component with a surface functional layer. The composite material component includes an outer layer and a body layer. The layers are the first and second composite material systems; the first composite material system is based on epoxy resin, phenolic resin, etc., the second composite material system is based on unsaturated polyester resin, and each system is based on carbon fiber Or fiberglass cloth as reinforcement. The VIMP preparation method is to firstly adopt the resin film infiltration process to prepare a reinforced resin film on the surface of a vacuum dip molding process molding mold, and then use the molding mold covered with the reinforced resin film to prepare a composite product through a vacuum dip molding process. Material components. The VIMP process of the present invention combines the double advantages of the RFI process and the VIMP process, and the prepared composite material component has better surface quality, better integrity and excellent comprehensive performance.

The invention discloses a method for carrying out plaster mould precise investment casting by utilizing copper pipes. The method comprises the following steps: manufacturing a copper pipe with a predetermined structure, placing the formed copper pipe in a mound to manufacture a wax mould; embedding the formed copper pipe in the wax mould, precisely positioning the copper pipe so as to carry out processes of grouting, sintering, and casting; wherein after the casting process, the copper pipe is embedded in an aluminum casting; and soaking the aluminum casting in a nitric acid solution until the copper pipe completely finishes chemical reactions. The method has the advantages of simple operation technology, reliability, high precision, and low requirements on mould, reduces the cost, and can realize casting of complex and tiny pipelines at the same time. The qualified rate of special-shaped casting with a small diameter manufactured by the method can reach 90% or more.

The invention belongs to the technical field of brake pad materials, and in particular relates to a synthetic brake shoe for high-power locomotive pressed at room temperature and a preparation method thereof. The synthetic brake shoe friction body is synthesized from materials with the following volume ratio: high vinyl butadiene rubber 25 ~30, steel fiber 7~10, aramid pulp 5~7.9, mineral fiber 5~9, sepiolite fiber 3~6, ​​zinc oxide 0.4~2, zinc stearate 0.1~0.3, rubber vulcanizing agent TMTD0. 5~3, industrial ethanol 3~8, phenolic resin 12~16, white cast iron 0.5~2.5, potassium feldspar powder 2~5, alumina polishing powder 0.2~0.8, floating beads 2~7.3, light calcium carbonate 2~ 4. Barium sulfate 2-5, granular graphite 1-3, friction modifier 1.5-5, calcium hydroxide 1-3. It is made by batching, banburying, crushing, pressing at room temperature and heat treatment. The synthetic brake shoe can be used in high-power locomotives with a maximum operating speed of 120km / h and an axle load of no more than 25t. It has stable friction performance and excellent wear resistance, and has little wear on wheels and low braking noise.

The invention discloses a method for maintaining pressures and then quickly boosting the pressures for metal low-pressure casting molding of aluminum alloy automobile chassis castings. The method includes that existing processes for low-pressure casting of aluminum alloy automobile chassis castings continue to be carried out at liquid lifting, mold filling and crystallization pressure boosting stages, and liquid lifting pressures, mold filling pressures and crystallization boosted pressures are 15-21 kPa, 25-35 kPa and 80-100 kPa under the control respectively; stages for maintaining the pressures and then quickly boosting the pressures are added between crystallization pressure maintaining stages and pressure releasing stages; a plurality of characteristic positions are set according to structure characteristics and solidification sequences of the castings; crystallization maintained pressures start to be increased and reach 150-1000 kPa after the fact that the characteristic positions A start to be solidified is determined, and the pressure boosting speeds are 10-40 kPa / s; then the castings enter pressure maintaining stages, the characteristic positions B, the characteristic positions C and the characteristic positions D are sequentially solidified, and the pressures continue to be maintained for 10-60 s after the characteristic positions D are completely solidified. The method has the advantages that solidification shrinkage supplementing effects and mechanical properties of the castings can be obviously improved, shortcomings of flashing of molten liquid, burr and flash of existing castings and the like can be overcome, and requirements on mold structures and casting mold clamping force can be obviously lowered.

The invention discloses a vehicle water pump structure and a production process thereof. The vehicle water pump structure comprises a pump body outer shell; a motor chamber, a rotating shaft groove and an impeller chamber are arranged in the pump body outer shell in sequence from left to right; a water outlet pipe groove and a water inlet pipe groove are connected to the top end and the bottom endof the impeller chamber separately; a motor, a rotating shaft and an impeller disc are inserted in the motor chamber, the rotating shaft groove and the impeller chamber separately; a shaft sealing device is mounted at the right end of the rotating shaft groove through a shaft sealing groove; a temperature measuring water control valve is mounted on one side of the water inlet pipe groove througha mounting groove; the shaft sealing device improves the tight waterproof performance of the motor, and can prevent the waste of water resources; such electric devices as the motor are convenient to install, maintain or replace by means of a maintenance mounting door; the temperature measuring water control valve controls the water pumping flow of a vehicle water pump according to the temperatureof a vehicle driving device, so that the vehicle driving device is always maintained in a better working state, and the water resources and the energy are saved; and the pump body outer shell is manufactured by using a lost-wax process, so that the water pump production difficulty and cost are reduced.