75results about How to "High thickness consistency" patented technology

The invention relates to a resonator and a forming method thereof, and the forming method of the resonator comprises the steps: forming a piezoelectric laminated structure on a first substrate, the piezoelectric laminated structure comprises a first region, and the surface, in contact with the first substrate, of the piezoelectric laminated structure is a first front surface; forming a sacrificiallayer covering the piezoelectric laminated structure on the first region; providing a second substrate; forming a bonding layer on the second substrate, the face, making contact with the second substrate, of the bonding layer is a second front face, and the face, opposite to the second front face, of the bonding layer is a second back face; attaching the second back surface of the bonding layer to the sacrificial layer and the piezoelectric laminated structure exposed out of the sacrificial layer, so that the bonding layer covers the side wall of the sacrificial layer and fills between the second substrate and the piezoelectric laminated structure; removing the first substrate to expose the first front surface of the piezoelectric laminated structure; forming a release hole penetrating through the piezoelectric laminated structure or forming a release hole penetrating through the second substrate, wherein the release hole exposes the sacrificial layer; and removing the sacrificial layer through the release hole to form a cavity. The method of the invention is beneficial to improving the performance of the resonator.

The invention provides a cross lapping machine, which relates to a cross lapping machine for fiber webs in non-woven fabric processing. The cross lapping machine comprises a controller, a body, a discharging bench, a lapping trolley and a feeding and conveying curtain for the fiber webs, wherein the feeding and conveying curtain and the discharging bench form an angle of 90 degrees; and the lapping trolley reciprocates to swing in a feeding direction. The cross lapping machine also comprises a lapping trolley position sensing device and a traction mechanism, wherein the lapping trolley position sensing device comprises two sensors which are arranged on the body corresponding to rotation decelerating points at two ends of a lapping trolley stroke respectively; the two sensors are connectedwith the controller respectively; the traction mechanism comprises a first traction roll and a second traction roll which are arranged above the conveying curtain in parallel; the first traction rollis driven by a constant-speed motor; the second traction roll is driven by a variable-speed motor; and the constant-speed motor and the variable-speed motor are connected with the controller respectively. The cross lapping machine greatly improves the transverse thickness consistency of the breadth of a non-woven fabric, avoids the condition that the thickness of both sides is greater than that of the middle part, and greatly improves the quality of products.

The invention discloses a method for improving the magnetic performance of sintered NdFeB through grain boundary diffusion, and belongs to the technical field of rare earth magnetic materials. The method comprises the steps that sintered NdFeB magnetic powder is subjected to semi-densification sintering, wherein the density is 90-95%; the periphery of the semi-densification sintered NdFeB is coated with turbid liquid, with the viscosity of 100-500 mpa.s, containing heavy rare earth compounds, the vacuum drying is carried out, coatings with heavy rare earth elements areobtained on the surface of a semi-densification sintered NdFeB magnet, then sintering at 1040-1080 DEG C is carried out for 2-3 h, primary tempering at 900-940 DEG C is carried out for 1-3 h, secondary tempering at 480-550 DEG C is carried out for 2-4 h, and the high-magnetism sintered NdFeB material is obtained. Certain adhesive force is formed between the semi-densification sintered NdFeB magnet and the coatings such as Dy2O3, Tb2O3, DyF3 and DyH3, the heavy rare earth elements enter the NdFeB magnet in the sintering process, the organizational structure and components at the combined position of a grain boundary and a main phase are improved, the heavy rare earth elements can be more easily diffused into the NdFeB magnet, the distribution uniformity and thickness consistency are high, and the depth of the diffusion layer is greatly increased.

The invention discloses a method for manufacturing a wax cap at the free end of a ceramic core, comprising the following steps: designing the free end of the ceramic core; At the wax cap, process the space required by the size of the wax cap; put the ceramic core into the casting wax mold, inject wax into the mold and keep the pressure; take out the wax mold with the ceramic core. The invention replaces the previous method of pressing the wax mold and then manually brushing the wax to make the free-end wax cap. The method of the invention reduces production time. At the wax cap at the free end of the ceramic core corresponding to the inner cavity of the casting wax mold, process the space required by the size of the wax cap, put the ceramic core into the casting wax mold, inject wax into the mold and keep the pressure, and the mold is pressed The wax cap is more regular, the size of the wax cap and the thickness of the wax layer are more consistent, and the gap between the corresponding ceramic core and the mold shell is uniform and controllable, which can reduce the core breaking rate during pouring.