36results about How to "Reduce demoulding resistance" patented technology

The invention provides a microneedles array, a method for manufacturing the microneedles array and a die for manufacturing the microneedles array. The microneedles array comprises a base and a plurality of microneedles which are integrated with the base, wherein a liquid storage cavity is arranged in the base, and each microneedle are provided with micro-pinholes which are communicated with the liquid storage cavity; the microneedles array is made of plastics, composite materials, and ceramics or metal materials by injection molding; and each microneedle has at least one inclined surface which is inclined towards the central line of the microneedle, and the outlet of each micro-pinhole is positioned on at least one inclined surface, so that the end of the outlet of the microneedle forms a pinnacle part. The die specialized for the invention comprises an upper die, a middle die and a lower die, wherein the middle die and the lower die are provided with cavities for forming the microneedles; and the upper die and the middle die are provided with grooves for forming the base. The three-plate die of the invention can be used for conveniently manufacturing the microneedles array with the pinnacles. Since the stripping process in the injection molding method is carried out step by step, the method has the advantages of small die drawing resistance and low manufacturing cost.

The invention relates to a miniature bonding permanent magnet and a production method thereof. The miniature bonding permanent magnet is a cylinder formed by a one-step formed cylindrical magnetic compact and an anticorrosion coating on the surface of the magnetic compact, wherein the cylindrical inner diameter of the cylindrical magnetic compact is 0.2-1.2 mm, the cylindrical outer diameter is 0.8-3.8 mm, and the height is 0.3-10 mm; and the thickness of the anticorrosion coating is 0.1-25 mum. The maximum magnetic energy product (BH) max of the miniature bonding permanent magnet can reach 76-216 kJ/m<3>. Compared with the traditional miniature bonding permanent magnet, the magnetic property of the miniature bonding permanent magnet is greatly improved, the size of the miniature bonding permanent magnet is greatly reduced, and the precision of the miniature bonding permanent magnet is further higher than that of the present magnet. The experiments shows that the miniature bonding permanent magnet can meet the newest requirements of lightness and thinness of digital cameras and video cameras.

The invention discloses a wall building formwork applicable to intelligent construction of a vertical shaft. The outer surface of the formwork is coated with a Teflon coating; a main body comprises a core frame cylinder, curve sliding rails and segmental sliding forms, and formwork supporting and releasing actions of the segmental sliding forms are realized by the aid of radial contraction indirectly produced by vertical traveling of the segmental sliding forms in the longitudinal direction through the curve sliding rails. Leveling and centering of the formwork are subjected to servo adjustment by corresponding hydraulic oil cylinders after pose determination by sensors, and circularity regulation is not needed. The formwork has basic function of a concrete pouring envelop structure as well as capacity of monitoring and evaluating the quality and an evolution process of cast-in-place concrete by means of setting of pressure, temperature, moisture and ultrasonic measurement points on the outer surface of the formwork. The formwork has the characteristics of being reasonable in structure, reliable in work, quick in action and capable of performing automatic centering and leveling and evaluating the pouring quality of the concrete in real time, and realizes intelligence of the construction process of the vertical shaft.

The average roughness Ra of a mold tool surface that comes into contact with a material to be molded measured for a measurement area 10 μm square or smaller is equal to or lower than 5 nm, and fine granular projection structures having diameters ranging from 10 to 80 nm and heights ranging from 10 to 40 nm are formed on the mold tool surface with a density of 400/μm² or higher. The frictional force due to the anchoring effect or the digging effect is reduced, and the adhesive force due to meniscus is also reduced. The release resistance is significantly reduced without affecting the dimensional precision of a fine molded product.

The invention discloses a die for preparing large-size tubular green bodies through gel casting. The die comprises a chassis, an outer die and an inner core. The outer die is detachably installed on the chassis. The outer die is provided with a cylindrical inner cavity. The inner core is located in the inner cavity of the outer die, and the inner core and the outer die are coaxially installed on the chassis. The space formed among the inner wall of the outer die, the outer wall of the inner core and the chassis is used as a die cavity where slurry is injected. The die for preparing the large-size tubular green bodies through gel casting is applied to the water-based gel casting technology and is convenient to disassemble and small in die removal resistance, and the green bodies are not likely to be deformed and cracked when dried.

The invention provides a pultrusion sectional material mould with an embedded core mould. The pultrusion sectional material mould comprises an upper mould body, the core mould and a lower mould body. The upper mould is arranged on the lower mould, and the lower end face of the upper mould is attached to the top end face of the lower mould. A positioning groove is formed in the lower end face of the upper mould. The core mould is embedded in the positioning groove and the upper mould and is in connection with the upper mould through a first bolt. A plurality of demoulding bolt holes used for pushing out the core mould are uniformly formed in the upper mould. The upper mould and the lower mould are positioned through a positioning pin and connected through a second bolt. The upper mould, the core mould and the lower mould together form moulding grooves used for making a sectional material. Rectangular grooves are formed in end face mould close joint of the upper mould and the lower mould correspondingly, and corresponding rectangular grooves form mould opening grooves together. A plurality of temperature measuring holes are formed in the side of the upper mould. According to the pultrusion sectional material mould with the embedded core mould, the embedded core mould design is adopted, positioning is accurate, the number of the parting faces and the assembling faces are small, the assembling difficulty is low, the close joint is tight, and the special demoulding bolt holes for pushing out the core mould are designed to reduce the difficulty of taking out the core mould.

The invention provides a polyphenylene sulfide resin composition including: 1 to 100 parts by weight of an olefin elastomer (B); and 0.01 to 10 parts by weight of a carboxylic acid amide wax mixture (C), relative to 100 parts by weight of a polyphenylene sulfide resin (A), wherein the carboxylic acid amide wax mixture (C) is obtained by adding 0.01 to 5 parts by weight of an antioxidant to 100 parts by weight of a carboxylic acid amide wax produced by reaction of a higher aliphatic monocarboxylic acid, a polybasic acid and a diamine.

The invention relates to a metal mold casting demolding machine for tubular shells. The metal mold casting demolding machine for tubular shells is characterized in that: three support trolleys (2) are arranged on a guide rail of a landing guide rail workbench (1), a prop-up trolley (9) is arranged on the guide rail of the support trolley (2) on the left, the right end plate of the workbench (1) is connected with an oil cylinder mounting base (6) by a screw (4), and left and right hydraulic tightening mechanisms (3) are connected with four fixed supports (11) by two rotating shafts (5). The metal mold casting demolding machine for tubular shells has the beneficial effects that: the metal mold casting demolding machine for tubular shells can realize casting mold demolding by turning twice, the demolding force is reduced, and the energy-saving and noise-reduction purpose is achieved; and besides, one-stage metal contour demolding requirement is satisfied, the shell is effectively prevented from damage, a new all-steel train guide rail structure is used, the support trolley can realize centering and also can change sliding friction into rolling friction so as to move along with the casting mold, the demolding resistance is reduced and the energy consumption is reduced.

The invention relates to a planar microneedle which comprises a substrate layer and a microneedle body arranged on the substrate layer in a turnover mode, the microneedle body comprises a needle tip, a needle base and a middle part connecting the needle tip and the needle base, and the direction, facing the needle base, of the needle tip is the same as the extending direction of the substrate layer. The invention also relates to manufacturing equipment of the planar microneedle, a preparation method of the planar microneedle, a microneedle patch and vertical equipment of the microneedle patch. The micro-needle has the beneficial effects that the direction of the needle point groove towards the needle seat groove is the horizontal direction, so that the depth of the forming groove and the ratio of the maximum depth to the maximum length of the forming groove are reduced, medicine carrying liquid is conveniently and accurately poured into the needle point groove of the forming groove, the situation that the medicine carrying liquid splashes to pollute the middle groove and the needle seat groove is avoided, and the formed micro-needle only carries medicine at the needle point.