39results about How to "Avoid Defective Defects" patented technology

The invention relates to a bi-directional barb exiting sliding block mechanism which is applied to a mould. The mould comprises an upper fixing plate, a female mould plate and a male mould plate. The bi-directional barb exiting sliding block mechanism comprise an outer sliding block, a wedge and an inner sliding block, wherein the outer sliding block is arranged on the female mould plate; the front end of the outer sliding block extends into a cavity for shaping the outer-side barb of a product; the rear end of the outer sliding block is provided with an inclined T-shaped slot; the upper end of the wedge is arranged on the upper fixing plate; the lower end of the wedge passes through the female mould plate; the side surface of the wedge is fixedly provided with a T-shaped block in a sliding fit with the inclined T-shaped slot of the outer sliding block; when the mould is opened, the T-shaped block drives the outer sliding block to outwards slide to exit the outer-side barb of the product; the inner sliding block is arranged on the male mould plate in a sliding mode; the front end of the inner sliding block extends into a cavity and bends upwards to shape the inner-side barb of the product; the rear end of the inner sliding block is fixedly provided with an inclined guide pillar which is in the opposite direction with the T-shaped slot; the inclined guide pillar is movably penetrated in the inclined guide hole of the female mould plate; and when the mould is opened, the inclined guide hole drives the inner sliding block by the inclined guide pillar to inwards slide to exit the inner-side barb of the product.

The invention relates to a method for extracting Al-Ce tubular intermetallic compound from magnesium alloy and a product, and belongs to the technical field of compound extraction in alloys. In the method, perchloric acid and acetic acid are taken as raw materials for preparing an extraction liquid, magnesium alloy containing Al-Ce tubular intermetallic compound is dissolved in the extraction liquid, then in the later period, centrifugation, washing and drying are performed, and the Al-Ce tubular intermetallic compound is prepared. According to the method, the extraction rate is high, the sound tubular morphology of the finally extracted Al-Ce tubular intermetallic compound is guaranteed, and the method is simple and easy to operate, low in cost and suitable for expanded production.

The invention relates to a preparation method and a product of a negative Poisson's ratio biological-based rigid foam material, belonging to the technical field of materials. In this method, bio-based rigid foam materials are first prepared by supercritical fluid foaming technology, and then bio-based rigid foam materials are used as raw materials to obtain negative Poisson's ratio bio-based rigid foam materials by heating-three-dimensional axial compression method. foam material. The method is simple and easy to operate, has low equipment requirements and low cost, and is suitable for enlarged production. The foam material prepared by this method is not only light and degradable, but also has excellent mechanical properties such as compression and shock resistance, and has good application prospects in the fields of aerospace, automobile, ship, encapsulation and the like.