31results about How to "The whole is dense and uniform" patented technology

The invention discloses an injection forming method of a soft magnetic ferrite material.The method comprises the following steps of: 1) powder preparation: mixing and milling ferrite powder at one time, after dryness, presintering the powder, crushing the presintered powder for secondary mixing and milling, and performing drying treatment, 2) mixing and granulation: uniformly mixing the powder obtained in Step 1) with an adhesive, mixing to form a mixture, crushing the mixture, 3) injection forming: heating the crushed mixture, injecting into a mold cavity under a pressure condition, opening a mold for cooling, then obtaining a forming body, 4) degreasing: putting the forming body in trichloro ethylene for degreasing, drying, and then performing heat degreasing, and 5) sintering: sintering the degreased forming body to form the soft magnetic ferrite material.The method is suitable for preparing middle and small high-precision ferrite core devices in complicated shapes, and the prepared soft magnetic ferrite material has the characteristics of large and uniform density, uniform internal structure, high mechanical strength and relatively low iron loss.

The invention relates to down jacket manufacturing, in particular to a manufacturing method and special tool which are high in processing efficiency and quality and beneficial for producing double-row down jacket ornament folds in batches. The method includes the following steps of placing pleated fabric and down jacket surface fabric on an operation console of a double-needle machine in an overlapping mode, adjusting a bobbin case, a thread clamping device and the stitch length of the double-needle machine, rotating a screw shaft on a presser foot of the double-needle machine so that an included angle ranging from 20 degrees to 30 degrees can be formed between a bottom plate and the operation console, and finally conducting thread conveying. The presser foot used for achieving the method comprises the base and an installation part, wherein two grooves for needles to penetrate through are formed in the bottom plate, an adjustment part is arranged between the bottom plate and the installation part, and the adjustment part comprises the screw shaft, a spring and a pressing ord. Operation is easy, the garment quality is ensured, and the production efficiency is improved.

A sealing method of the compression padding with the density gradient comprises the first step of placing the strip-shaped padding in a forming mold according to a certain weight and a certain size, the second step of pressing the strip-shaped padding into annular padding rings through a press, wherein the forming height of the padding rings can be accurately controlled through a liner stop piece with the preset height in the pressing process so that the padding rings with the required densities can be obtained, and the third step of making the padding rings overlap in the force bearing direction, wherein the densities of the padding rings sequentially increase one by one in the force bearing direction. The invention further comprises the compression padding produced according to the method, wherein the compression padding is composed of the padding rings overlapping in the force bearing direction, and the densities of the padding rings sequentially increase one by one in the force bearing direction.

The invention discloses a spray deposition densifying device and the application thereof. The device disclosed by the invention includes a rotating shaft, wherein a plurality of rotating balls are fixed on the rotating shaft; each rotating ball is fixed on the rotating shaft through a flexible chain; during the rotation of the rotating shaft, the rotating balls are distributed in a spiral line around the rotating shaft, the extending direction of the spiral line is the same as the axial direction of the rotating shaft, and the length of the flexible chain in the direction the same as the rotating direction of the rotating shaft periodically changes along the spiral line; within each period, the length of the flexible chain is gradually increased in the direction the same as the rotating direction of the rotating shaft; the screw pitch of the spiral line is 30-50 mm; and the central angle of ball centers of the two adjacent rotating balls is 10-15 degrees. During the spray deposition, the rotating balls in the densifying device are used for impacting the surface of a deposition blank, metallurgical bonding is generated under the shearing action, the deposition blank is densified layer by layer through the rotation of a pipe blank during the spray deposition, the entire densification is realized in an accumulated manner, so that the pipe stock with high performance is obtained.

The invention discloses a tool for compacting a thick-walled hollow carbon / carbon (C / C) composite product, which comprises an outer barrel, a gas inlet substrate and a gas guide device, wherein the interior of the outer barrel is provided with a gas inlet basal plate; a cavity I is formed between the gas inlet substrate and the gas inlet basal plate; the gas inlet substrate is provided with a gas inlet; the top face of the gas inlet basal plate is provided with an inner barrel; a to-be-compacted thick-walled hollow C / C composite preform is sheathed onto the inner barrel; a gap I for the circulation of gas is formed between the outer surface of the C / C composite preform and the inner surface of the outer barrel; a gap II for the circulation of the gas is formed between the inner surface of the C / C composite preform and the outer surface of the inner barrel; and the gas inlet basal plate is provided with a plurality of diversion passages II and diversion passages III, wherein the diversion passages II are used for communicating the cavity I with the gap I, and the diversion passages III are used for communicating the cavity I and the gap II. According to the tool for compacting the thick-walled hollow C / C composite product, gas diversion can be performed, and thereby, the retention period of pyrolysis gas in a depositing space is shortened, and the C / C composite preform is rapidly and evenly compacted.