33results about How to "Effective control of precision" patented technology

The invention relates to a PCB (printed circuit board) back drilling method. The PCB back drilling method comprises the following steps: fixing a PCB on a machine table, and mounting a drill bit on a drilling machine; selecting a target layer, and determining an actual control depth h1 of the target layer; and determining a back drilling control depth h of the PCB according to the actual control depth h1 of the target layer and a preset safety length M of a stub and controlling the drill bit to drill a hole drilling machine control system. According to the PCB back drilling method, influence of thickness uniformity of the board, cone height of a drill tip and copper / tin-plating process variation on the accuracy of the control depth can be reduced; and through introduction of the safety length M of the stub, the precision of the PCB back drilling control depth h can be effectively controlled, thus achieving precision control of the stub and eliminating adverse effects of the stub on a signal.

The invention discloses a method for preparing a force-responsive photonic crystal material based on nano-molding technology, which etches a master template according to pre-designed photonic crystal structure parameters to prepare elastic polymers with inverse nanoscale patterns Soft template, using the soft template as a secondary template, "copy" the pattern on the master template to the high-elastic gel matrix layer with "high fidelity" through a three-step pattern transfer method to fix the lattice of the photonic crystal position; then, the viscoelastic polymer is filled in the lattice to obtain a single-layer highly elastic gel-viscoelastic polymer composite layer with a photonic crystal structure, and then a force-responsive photon crystal material. Compared with the prior art, the preparation method of the present invention has the characteristics of simple process, short process, easy control of process parameters, reusable template, high product precision level, stable and reliable quality, and low cost.

The invention relates to the field of photogrammetry and surveying and mapping, particularly to a digital mapping method and system based on a live-action 3D model. Digital mapping is carried out by unmanned aerial vehicle oblique photography 3D modeling and cooperation with a ground survey robot, digital mapping of the data acquisition result is more portable and flexible, at the same time high resolution live-action 3D model data can be acquired, and the sense of reality is strong. A control point coordinate acquired by the ground survey robot can effectively control the overall accuracy of the model, an acquired feature point coordinate can effectively compensate for the defect of low coordinate precision because of the influence of a barrier object on unmanned aerial vehicle aerial photography modeling. The method and system provided by the invention have greatly improved work efficiency, also can acquire vivid 3D topographic and geomorphic data at the same time, and meet the demand for diversified data results.

A method for processing and manufacturing a rectangular seal. First draw a drawing of the rectangular seal according to the shape and size required by the product, and then design a rectangular sealing ring mold according to the drawing. The height of the mold design must not be greater than the width of the nylon column of the slitting equipment. Produce a rectangular seal that meets the drawings, then superimpose the thickness of the rectangular seal to a certain height and put it into the rectangular seal ring mold, heat vulcanize the whole to obtain a rectangular seal, and finally use the gas to push the rectangular seal into the nylon that is set on the slitting equipment On the column, the rectangular sealing ring is cut by a slitting device to obtain a rectangular sealing member; the advantage of the present invention is that the manufacturing efficiency of the rectangular sealing member is high, and the precision can be effectively controlled.

The invention is suitable for the technical field of control and provides a control method and a control device of a shielding door and a radar. The control method of the shielding door comprises thesteps of using the radar for monitoring a preset space to monitor at a first working frequency to obtain a first monitoring result after receiving a shielding door opening information; if the first monitoring result is that a target does not exist, transmitting a first control signal, wherein the first control signal is used for indicating the shielding door to be closed; if the first monitoring result is that the target exists, using the radar to monitor at a second working frequency to obtain a second monitoring result, wherein the first working frequency is less than the second working frequency; and if the second monitoring result is that the target exists, transmitting a second control signal, wherein the second control signal is used for indicating the shielding door to keep a current open state. Through the method, the shielding door control accuracy can be effectively improved, the service life of the radar can be prolonged, and the reliability and adaptability of the radar canbe enhanced.

The invention discloses a chart recognition method, device, equipment and storage medium. The method includes: acquiring a text file containing chart data; converting the text file into a picture in a preset format; inputting the picture into a chart positioning detector, and outputting The positioning result of the chart data in the picture; wherein, the chart positioning detector is obtained by training a preset neural network through a sample data set containing sample chart data. The text file containing chart data in the present invention can be a text file of any format and type, and converting the text file into a picture avoids the need to use a standard protocol to parse the text to locate the chart position in the prior art. If the picture is directly input into the pre-trained chart positioning detector, the positioning result of the chart data in the picture can be directly output, which can solve the problem that the existing technology is inefficient in identifying charts from text files and the accuracy of identifying charts is low. question.

The invention relates to a device for additive manufacturing of rigid thermal insulation tile bodies. The device comprises a filter container capable of being operated to move in the horizontal direction, a liquid discharging pipe communicated with a liquid outlet of the liquid collecting part, a feeding system for feeding materials into the filter container as well as a pressurizing device located on one side of the spray head and used for pressurizing materials in the filter container, wherein the filter container comprises a bottom plate comprising openings in the peripheral walls and the middle, a bottom net at the lower part of an inner cavity defined by the peripheral walls, reinforcing ribs for supporting the bottom net and a liquid collecting part below the reinforcing ribs; the feeding system comprises a storage chamber, a feeding pipe, a spray head communicated with an outlet end of the feeding pipe and a perforated plate arranged below the spray head and having a hole array,holes in the hole array are through holes, and the through holes correspond to nozzles of the spray head and are used for supporting and fixing the nozzles; the pressurizing device comprises a pressure head, a pressure arm fixedly connected with the pressure head and a driving device for driving the pressure arm to vertically stretch and retract. The device can manufacture the rigid thermal insulation tile bodies with uniform density and accurate thickness and has the advantages of simple structure, low manufacturing cost and the like.

The invention relates to a missile launcher technology. In order to solve the problems of easy embrittlement during long-term storage of an easily-cracking front cover and potential safety hazards due to a large quantity of fragments after the cover is broken after launched, the invention provides a composite easily-cracking front cover opened in one side and a making method of the composite easily-cracking front cover. Compared with the prior art, the composite easily-cracking front cover has the advantages and the beneficial effects of light weight, high strength and good compaction due to the adoption of a composite, and can ensure that the front cover structure is more reasonable in performance and is greatly improved in sealing property; and made by adopting a mold, the composite easily-cracking front cover has the advantages of capability of effectively controlling precision and ensuring that cover breaking pressures are consistent, rapidness, high efficiency and stable quality; and an opened cover body can not be separated from the launcher so as to eliminate potential safety hazard caused by scattering broken fragments after the cover is opened. The composite easily-cracking front cover is formed through medium-temperature curing, can be reliably used under the condition of high-temperature and low-temperature environments, and is difficult in embrittling and cracking.

The invention discloses a method for preparing a force-responsive nanoscale photonic crystal material. Electron beam lithography technology and reactive ion etching technology are used to etch a nanoscale pattern according to pre-designed photonic crystal structure parameters. The rigid template is used as the filling template, the highly elastic gel with excellent mechanical properties is used as the matrix material, and the viscoelastic polymer is used as the filling material. By filling the template, the pre-designed photonic crystal pattern is "transferred" to the viscose In elastic polymers, nanoscale, structure-controllable and force-responsive photonic crystal materials are prepared through steps such as spin coating and stacking. Compared with the prior art, the preparation method of the present invention has the characteristics of simple process, short process, easy control of process parameters, reusable template, high product precision level, stable and reliable quality, and low cost.

The invention discloses a method for preparing a force-responsive photonic crystal material based on reverse imprint nano-molding technology, which uses electron beam lithography technology and reactive ion etching technology to etch according to pre-designed photonic crystal structure parameters A rigid template with a nanoscale pattern is used as a master template to prepare an elastic polymer soft template with an inverse nanoscale pattern, and it is used as a secondary template; high elastic gel is used as a filling material, viscoelastic polymer As a molding material, the pattern on the master template can be "replicated" into the viscoelastic polymer in a "high-fidelity" manner by reverse imprinting; and then a nanoscale, structurally controllable force-responsive Photonic crystals. Compared with the prior art, the preparation method of the present invention has the characteristics of simple process, short process, easy control of process parameters, reusable template, high product precision level, stable and reliable quality, and low cost.