15 results about "Powder injection molding" patented technology

This invention discloses a liquid-cooled microchannel powder metallurgy fabrication method, belonging to the field of radiator manufacturing technology. The invention employs a pre-stamping process to prepare copper heat dissipation fins, combined with customized spherical high-purity copper powder and composite polymer bonding particles. A uniform mixture is prepared through segmented high and low temperature and high and low speed stirring. This is then combined with metal powder injection molding, oxalic acid degreasing, nitrogen atmosphere constant temperature anti-oxidation pretreatment, and high-vacuum sintering processes, along with controllable molding and sintering parameters, to fabricate a copper liquid-cooled microchannel radiator. This invention effectively solves the problems of difficult molding of thin-walled pure copper microchannel structures, poor dimensional consistency, and susceptibility to defects and springback. It significantly improves the extrusion of copper materials in microchannel structures, the smoothness of the inner wall, and the overall density, strengthens the bond strength between the fins and the substrate, and eliminates leakage, corrosion, and heat dissipation attenuation under long-term liquid cooling cycles. The product yield is high, and the stability is excellent.

This invention provides a directional thermally conductive copper-based diamond composite material and its preparation method, belonging to the technical field of copper-based diamond composite materials. By constructing a "diamond particle size gradient + aluminum nitride / silicon carbide ceramic gradient," combined with multilayer powder injection molding and segmented vacuum hot pressing, the thermal conductivity and thermal expansion in the thickness direction are synergistically controlled: the upper layer of fine-grained diamond and a small amount of aluminum nitride forms a high thermal conductivity layer, the middle layer of medium-grained diamond and a relatively high amount of aluminum nitride acts as a thermal-mechanical buffer, and the lower layer of coarse-grained diamond and silicon carbide improves the expansion matching and sintering stability of the substrate side; sequential injection combined with interval time and thickness ratio control forms a continuous composition gradient and particle intercalation interface during debinding and densification processes, and through two-step heating, three-stage pressure, depressurization and slow cooling, and medium-temperature heat preservation, densification, interfacial reaction and residual stress release are taken into account, so that the copper-based diamond composite material maintains high thermal conductivity while having an adjustable expansion gradient and high structural reliability.

This invention relates to the field of injection molding machine technology, and in particular to a screw unit for a powder injection molding machine, comprising a spline sleeve and multiple kneading block units sequentially sleeved on its outer peripheral wall; the lower end of the spline sleeve is provided with a stop boss, the boss having a first helical surface and a first positioning hole, the spline sleeve being paired with a drive component corresponding to each kneading block unit; the kneading block unit includes a kneading disc, a spring, and a locking pin, the kneading disc having a second helical surface and a second positioning hole, the lower end of the locking pin having a locking part adapted to the positioning hole and a third helical surface cooperating with the drive component, and the spring being located between adjacent kneading discs or between the kneading disc and the stop boss. This invention achieves kneading disc phase adjustment simply by applying and releasing axial force, without disassembling the entire screw functional unit, improving production efficiency. Furthermore, the locking part and positioning hole are precisely matched during operation, ensuring kneading stability and molding accuracy. The modular structure offers excellent adaptability and maintainability.

The application discloses a powder injection molding mold with a deformation pre-compensation function and relates to the technical field of powder injection molding molds.The powder injection molding mold comprises a mold carrier, a guide slide rod, a slide plate, a lower molding assembly and an upper molding assembly.The lower molding assembly comprises a plurality of spliced lower mold plates, each of which is connected with an adjusting positioning cover one through an adjusting rod one.The upper molding assembly comprises a plurality of spliced upper mold plates, each of which is connected with an adjusting positioning cover two through an adjusting rod two.The adjusting positioning cover one and the adjusting positioning cover two are connected with an air inlet and air outlet flow control module through an air path with a control valve.The application can independently adjust the position of each mold plate according to the shrinkage of different parts of a part, realize non-uniform pre-compensation of a cavity, adapt to the non-uniform shrinkage of the part, greatly improve the size precision of the part, and simultaneously improve the feeding filling density through a vibration mechanism, and is suitable for high-precision batch production of powder injection molding parts with complex structures.

The utility model discloses a kind of workpiece sintering devices for metal powder injection molding processing, including device ontology, the bottom surface of the device ontology is connected with support seat, the front of the device ontology is connected with touch panel, the front of the device ontology is inlaid with general control switch, the inner wall of the device ontology is connected with conveying mechanism, the back of the device ontology is connected with waste gas treatment mechanism.This device is integrated in device ontology by defatting, sintering, cooling and other processes, with the orderly transmission of conveying mechanism, avoids the transfer of workpiece between multiple equipment, greatly shortens processing cycle, improves production efficiency, and reduces the pollution and damage risk in workpiece transfer process, simultaneously arranged potential plate and temperature sensor work cooperatively, can real-time accurate monitoring and control sintering area temperature, effectively isolate in combination with sealing element each functional area, ensure sintering process stability, effectively reduce the quality problems such as crack, deformation of workpiece.

This utility model relates to the field of metal parts processing technology and discloses a powder injection molding metal parts feeding device. Two sprockets are each fitted with a chain, and a connecting plate is fixedly connected to the outside of the chain. A rotating shaft is fixedly connected inside the connecting plate, and a feeding box is rotatably connected to the outside of the rotating shaft. A baffle is fixedly connected to the outside of the feeding box, and a discharge pipe is fixedly connected inside the feeding box. In this utility model, a motor drives a rotating rod and sprockets to rotate, causing the feeding box on the chain to move. When the baffle hits the top of the hopper opening, the feeding box tilts, and the powder enters the hopper through the discharge pipe and then into the box body, thus achieving automatic feeding. This allows for precise injection of metal powder into the hopper, achieving automated feeding, reducing manual intervention, minimizing direct contact between operators and metal powder, improving production safety, and ensuring the stability of the raw material ratio for each batch of injection molding.

The present application relates to the field of powder injection molding, and particularly relates to a preparation method of refractory tungsten with uniform microporous structure. The preparation method mixes tungsten nanopowder with a binder to granulate, and then injection molds the treated powder to obtain a green body with uniform microporous structure; a sectional sintering method is used to pre-coarsen to control the uniformity of the structure and pores, and then further control the grain size and pore size, so that the prepared porous tungsten material has fine and uniformly distributed grain structure and pores, the porosity is 20%-50%, the average grain size is less than 1 mu m, the pore size is less than or equal to 0.5 mu m, and the variance is not more than 0.4. The method solves the problems of coarse grains, uneven pore size and pore distribution in the porous tungsten material prepared by the traditional method.

The application discloses a kind of light high-strength metal powder injection molding materials, its processing method and the shaft made, belong to metal powder injection molding technical field.Forming material in the application is titanium as matrix, reasonable proportioning auxiliary element and oxygen content, utilize inter-element solid solution strengthening effect to promote material comprehensive performance, and match with the multi-component composite binder suitable for powder, ensure forming processing performance.Processing method is accurately controlled mixing, injection molding, debinding, sintering and two high-pressure shaping processes, combined with partition control to improve dimensional accuracy.Thin-walled shaft made by the application is dimensionally stable, fatigue resistance, suitable for batch production of high-precision thin-walled shafts for folding terminal devices.

This application relates to a cobalt-free titanium carbonitride-based cermet for surgical scalpels and its preparation method. The cobalt-free titanium carbonitride-based cermet for surgical scalpels of this application uses a cobalt-free Ti(C,N)-based cermet with a binder phase. It can achieve near-net-shape integration of the handle and blade through powder injection molding. Optimized material formulation and sintering process result in a scalpel that combines high sharpness, high toughness, excellent biocompatibility, and sterilization resistance, fully meeting the requirements for safety and precise operation in medical surgery.

The present application relates to the technical field of powder injection molding material, and particularly relates to a Y-containing Ni-Ti based shape memory alloy and a molding process thereof, which comprises the following atomic mass percentage chemical components: Ti: 49.6-50.0%, Y: 0.2-0.6%; the balance is Ni and inevitable impurities; wherein, the chemical component Y is added in the form of Y powder in the shape memory alloy molding process, and is mixed with NiTi alloy powder by mechanical ball milling to form mixed powder, and then metal injection molding is performed. Compared with element Ti, Y has higher oxygen affinity, can reduce or eliminate the formation of TiO2, Ti4Ni2O x phases in the sintering process; the addition of Y reduces the consumption of Ti, ensures that the ratio of Ni and Ti is within a reasonable range, and the oxide formed by the Y element is within the micron range, which has little effect on the shape memory effect and mechanical properties of the NiTi alloy; the NiTi alloy component in the present application is suitable for powder metallurgy process, especially powder injection molding process (MIM).

The application discloses a method for preparing large parts by using a metal powder injection molding process, belongs to the technical field of large part processing, and aims at solving the technical problem that the strength of large parts prepared by the metal powder injection molding process in the prior art needs to be further improved; the method comprises the following steps: stirring a reinforcing agent, paraffin and acetone in a reaction kettle, increasing the temperature of the reaction kettle to 40-50 DEG C, and stirring until the system is dissolved to obtain a reinforcing modification liquid; and adding metal powder into a high-speed mixer and heating until the temperature of the metal powder reaches 100-110 DEG C, and then slowly adding the reinforcing modification liquid into the high-speed mixer; the application effectively improves the ultimate tensile strength, yield strength, elongation and hardness performance of the injection part by preparing modified metal powder with high flow performance, combining the modified metal powder with a binding aid, and optimizing injection conditions and debinding and roasting conditions.

The application discloses a laser automatic sprue removing device and method in a powder injection molding process, a laser cutter is installed on a slider of a vertical mold group, a conveying mold group is installed above a machine table, two conveying tracks are symmetrically distributed with respect to the conveying mold group, a conveying plate is slidably installed on the conveying tracks, the conveying plate is fixed with the slider of the conveying mold group, a blank fixing mold is fixed on the conveying plate, a protection structure for protection during cutting is installed on the left side above the conveying plate, a supporting and clamping structure for supporting and fixing the sprue of the blank is installed in the protection structure, and an air suction element for dust suction and cooling is installed, the supporting and clamping structure is arranged in the protection structure, the sprue can be clamped and fixed before cutting, the sprue is prevented from drooping due to its own weight during cutting, cutting quality is improved, and cutting displacement caused by gravity is effectively prevented.

This utility model discloses a demolding mechanism for metal powder injection molded preforms, mainly applied in the field of metal powder injection molding technology. It includes a moving mold, a fixed mold, a motor, and a cam. The fixed mold is fitted with a punch, and the moving mold is fitted with a corresponding die. Guide pillars are installed at the four corners of the fixed mold, and guide sleeves are correspondingly installed at the four corners of the moving mold. Cooling channels within the fixed mold are connected to cooling channels within the punch. The mechanism also includes a support, a support rod, an impact block, and an impact seat. The fixed mold, moving mold, and punch have grooves on their mating sides. A support is detachably connected to the outer wall of the punch. The support is L-shaped, and a support rod is rotatably connected to one end of the support. A torsion spring is installed on the rotating shaft. This metal powder injection molded preform demolding mechanism features a scientifically designed structure, low manufacturing cost, stable and reliable operation, independent operation, convenient maintenance, low maintenance cost, adjustable impact intensity and frequency, strong adaptability, and high demolding efficiency.

The application discloses a kind of wear-resistant steel's metal powder injection molding method, it includes the following steps: S1: wear-resistant steel alloy powder injection molding obtains green body, and the green body is catalyzed to be debound, to obtain to be sintered product;S2: the sintered product is placed in sintering furnace sequentially negative pressure debinding, vacuum inner burning and sintering treatment, to obtain sintered part;Wherein, the sintering treatment is: with 0.1~1 ℃ / min heating rate, furnace temperature is increased to 1220~1240 ℃, and keeps warm 60~360min;S3: the sintered part is carried out hot isostatic pressing treatment, to obtain wear-resistant steel.The wear-resistant steel's metal powder injection molding method of the application can prepare wear-resistant steel with density and uniformity of organization, and improve the comprehensive mechanical properties of the wear-resistant steel, it has good popularization prospect and application value.

The application discloses a kind of titanium alloys, the titanium alloy is obtained by titanium alloy powder injection molding;Wherein, the titanium alloy powder includes: titanium alloy ball and TiB2 layer, polyamine layer, graphene oxide layer successively coated on the surface of titanium alloy ball, and the graphene oxide layer contains cerium element.The application also discloses a preparation method of the above-mentioned titanium alloy, comprising the following steps: taking titanium alloy powder and binder mixing, injection molding, degreasing, vacuum sintering at 1000-1100 DEG C for 2-3h, cooling to room temperature, solid solution at 700-720 DEG C for 40-60min, air cooling to room temperature, then heat preservation at 450-470 DEG C for 3-3.5h, and then air cooling to room temperature, to obtain titanium alloy.The titanium alloy has good strength while maintaining good toughness.