36results about How to "Avoid Design Mistakes" patented technology

The invention discloses a three-dimensional model part comparison system and method. The three-dimensional model part comparison system comprises a capture unit, a setting unit, a processing unit and a prompt unit. The capture unit is used for capturing a first model and a second model. The setting unit is used for setting absolute coordinates of a three-dimensional space. The processing unit is used for comparing a plurality of parts in the first model and the second model in the absolute coordinates of the three-dimensional space to judge whether coordinate values of first parts with the same names and corresponding second parts with the same names are different or not to determine whether a prompt signal is sent out. The prompt unit is used for receiving the prompt signal to output prompt information with different coordinate values. Therefore, the error rate of design is reduced.

The invention discloses a composite three-view-field star sensor star map simulation method. The composite three-view-field star sensor star map simulation method comprises the following steps that step 1, an observation star meeting the requirements is selected according to the limiting magnitude of a star sensor, and star number, star magnitude, right ascension and declination data of the observation star is extracted and stored in an observation star database; step 2, statistics is conducted on observation stars in three optical system view fields of the composite three-view-field star sensor, and incidence angles of the observation stars in subsystem coordinate systems the observation stars belongs to in the X and Y directions are calculated; step 3, the star magnitude, view field position data of fake stars is randomly produced according to the total number of the fake stars; step 4, imaging of the observation stars and the fake stars within the respective view fields performed by an optical system is simulated through ray tracing, and image plane information is calculated; step 5, the brightness of each pixel of a digital star map is calculated, and the digital star map is output. The composite three-view-field star sensor star map simulation method is simple and convenient to operate and low in cost, does not depend on a hardware system formed through machining and can provide rich simulation star map data for other technical research of the composite three-view-field star sensor.

The invention discloses a character string-based method for creating and retrieving knowledge points of circuit components, including: selecting image information of an object circuit diagram; performing binary processing on the image; performing Hough transform on the image; and extracting components from the image and component pins; standardize and rotate the extracted components; digitize the components to obtain the unique character string corresponding to the component; convert the unique character string corresponding to the component and the corresponding text remark information Both are used as the label of the screenshot information of the component, and the label and the screenshot information of the component are stored in the knowledge point database; the knowledge point database is retrieved with a string as a parameter, and the screenshot information and text notes corresponding to the component are obtained information. The invention retrieves the design error point remark information and connection error screenshot information of components corresponding to the string in the knowledge point database in the form of character strings, and the retrieval results appear in real time, and the effect is very ideal.

The invention provides a compound lathe and a workpiece processing method. The compound lathe has the functions of a lathe and a processing center, so as to realize the lathe work, the large-plane processing and heavy cutting by using a large-size rotating tool and easily exchanging for two workpieces including the tool. The compound lathe is provided with a tool shaft (5), the moving position of which is controlled on three orthorhombic axial directions. The tool shaft (5) can rotate around a Y axis (on the front and back directions) relative to an operator and rotate around an axis parallel to a plane orthorhombic to the Y axis. Used as a workpiece holder, the tool shaft is provided with a structure as same as the traditional opposite double-spindle lathe, at least one turret (41) arranged under the spindle axis, and tool storages (7L, 7R) and tool exchanging devices (72L, 72R) above two spindles (2, 3) on two sides of the tool shaft (5).

The invention belongs to the field of steel heat treatment, and more specifically relates to a tempering technology of G18CrMo2-6 steel. The tempering technology is capable of solving a problem that impact toughness of G18CrMo2-6 steel is poor, and changes under different tempering treatment conditions. The tempering technology comprises following specific steps: 1) the G18CrMo2-6 steel after normalizing heat treatment is heated to a temperature smaller than Ac1 at a certain heating speed, and is subjected to tempering treatment after different heat preservation periods; and then charpy V-notch impact test is performed so as to obtain test data; 2) the test data is input into a tempering parameter formula for calculation, and a tempering parameter-impact value corresponding curve is drawn; and 3) a reasonable heat treatment technology is determined based on the optimum value in the tempering parameter curve. According to the tempering technology, the heat treatment technology is determined based on the tempering parameter formula of G18CrMo2-6 steel, so that design errors are avoided, the design of the tempering technology is more reasonable, and designed results are scientific and standard.