32results about How to "Precise control of dimensional accuracy" patented technology

The invention discloses an injection molding device and an injection molding method. The device comprises an upper mold and a lower mold; a steel needle insert with a steel needle is arranged on the upper mold or the lower mold; a layer of elastic film is arranged on the mold surface, opposite to the steel needle, of the upper mold or the lower mold; the shape and the size of the steel needle are the shape and the size needed to form microholes by injection molding; and the steel needle is projected to the elastic film from the upper mold or the lower mold, and is set to enable the end surface of the steel needle to press into the elastic film after mold closing. The device and the method can effectively solve the problems of difficult manufacturing of micron-scale microholes and microhole arrays, poor size precision and great possibility of generation of defects and flanges in hole mouths in traditional injection molding device and method.

The invention discloses an injection molding device and an injection molding method. The device comprises an upper mold and a lower mold; a steel needle insert with a steel needle is arranged on the upper mold or the lower mold; a layer of elastic film is arranged on the mold surface, opposite to the steel needle, of the upper mold or the lower mold; the shape and the size of the steel needle are the shape and the size needed to form microholes by injection molding; and the steel needle is projected to the elastic film from the upper mold or the lower mold, and is set to enable the end surface of the steel needle to press into the elastic film after mold closing. The device and the method can effectively solve the problems of difficult manufacturing of micron-scale microholes and microhole arrays, poor size precision and great possibility of generation of defects and flanges in hole mouths in traditional injection molding device and method.

The invention relates to a plate mounting device and a leveling mounting method thereof. The plate mounting device comprises profiles, grooves are dug in the profiles, and plates are inserted in the grooves of the profiles. The leveling method of the plate mounting device comprises the following steps that (1) firstly, the ground is leveled, the side faces of the profiles are attached to a structural wall, the bottom faces of the profiles are attached to the ground, and the profiles are fixed; and (2) the plates are sequentially inserted into the grooves of the profiles. By means of the mounting mode that the profiles are placed firstly, mounting can be convenient, the size and the horizontal precision in a decoration completed face can be accurately controlled, the mounting process is simple, the construction efficiency and the construction quality are obviously improved, manpower and financial expenditure is saved for enterprises, dust in the operation link is little, and the environment-friendly effect is good.

The invention provides an automatic numerical control lathe tailstock control method. A connection device for achieving automatic connection and disconnection between a lathe saddle and a tailstock of a numerical control lathe through an air cylinder is utilized. The connection device comprises a connection pillar, a rotating arm assembly, a drive assembly and a drill bit assembly, the middle of the connection pillar is provided with an annular groove, the shaft end of the connection pillar and the side face of the tailstock are provided with a pair of sensors, the rotating arm assembly comprises a rotating arm, a rotating shaft, a shaft sleeve and a big gear, the shaft sleeve is fixed to the front side face of the tailstock of the numerical control lathe, the rotating shaft penetrates through the shaft sleeve, the front end of the rotating shaft is fixedly connected with the rotating arm, the other end of the rotating shaft is fixedly connected with the big gear, the front end of the rotating arm is provided with a hook portion capable of being clamped into an annular groove, the drive assembly comprises a rack, an air cylinder, a magnetic exchange valve, a rack guide groove, a reset switch and a controller, the controller is mounted in a lathe power distribution cabinet and electrically connected with a numerical control system and the magnetic exchange valve, and the rest switch is mounted in front of the lathe saddle of the numerical control lathe and electrically connected with the controller.

The invention provides a digital controlled lathe tailstock control method achieving alignment by means of a V-shaped block. A digital controlled lathe saddle and tailstock engaging and disengaging connecting device is adopted and comprises an alignment component, a rotating arm component and a driving component, wherein the alignment component comprises an alignment shaft and the V-shaped block, the rotating arm component comprises a rotating arm, a rotating shaft, a shaft sleeve and a big gear, and the shaft sleeve is fixed to the front side face of a digital controlled lathe tailstock; the rotating shaft penetrates through the shaft sleeve, the front end of the rotating shaft is fixedly connected with the rotating arm, the other end of the rotating shaft is fixedly connected with the big gear, and a hook part capable of being clamped into a ring slot is arranged at the front end of the rotating arm; the driving component comprises a rack, a cylinder, an electromagnetic directional valve, a rack guiding groove, a reset switch and a controller, the controller is installed in a machine tool power distribution cabinet and electrically connected with a digital control system and the electromagnetic directional valve, and the reset switch is installed on the front side of a digital controlled lathe saddle and electrically connected with the controller.

The invention discloses a processing method of surface-mounted pads on a thick copper circuit board. The processing method comprises the following steps: S01. patterning an external layer for the first time; 2. etching the external layer for the first time; 3. patterning the external layer for the second time; 4. etching the external layer for the second time; and 5. manufacturing a solder mask bridge among the surface-mounted pads by a fractional solder resisting method. The processing method has the beneficial effects that the surface-mounted pads are manufactured by a partitioned etching method, which strengthens size control of the surface-mounted pads and meets the design requirements; and the solder mask bridge among the surface-mounted pads are manufactured by utilizing the fractional solder resisting method so that the solder mask bridge and the circuit board are firmly connected together and are not easily separated from each other.