RU2117240C1 - Device for checking sizes of articles with longitudinal axis of symmetry - Google Patents

Abstract

FIELD: checking and measurement of parameters of curvilinear surfaces. SUBSTANCE: device has horizontal table provided with two independent drives designed to move table along two mutually perpendicular axes of horizontal plane (along axes X and Y). To perform measurements, table is fitted with pickups of linear motion (along axes X and Y, respectively). Surface of table moving part carries rigging for installation and positioning of article being checked. Laser radiation source coupled optically to radiation receiver is fixed above operating space of table. Photodiode may be used as radiation receiver. Radiation receiver is positioned on immovable part of table 1 under its moving part. Output of radiation receiver is connected to inputs of primary processing units and control unit. Second inputs of primary processing units are connected to linear motion pickups, and outputs are connected to processor unit. The latter is connected to storage unit and interface unit, which output serves as control unit output and is connected to computer. Rigging for installation of article to be checked is represented by two parallel runners of triangular section which longitudinal axis is parallel to axis Y. Operating space of table moving part is made transparent for optical coupling of radiation source and radiation receiver. Rigging for positioning article to be checked is essentially dividing head made as a disc with holes arranged over circumference. Spring-loaded secured rigidly on table surface is coupled functionally to dividing head through holes. EFFECT: wide functional capabilities, quick action. 4 cl, 2 dwg

Description

 The invention relates to the control and measurement of parameters of curved surfaces of products having a longitudinal axis of symmetry, for example, to control the parameters of the skirt and oval of the internal combustion engine pistons.

 Known instrumentation (CMM) for dimensional inspection of parts of complex shape, manufactured by DEA (Italy). They are a horizontal stationary table for installing and positioning the measured product, a sensitive element for receiving information, movable relative to the table, made in the form of a probe, which is connected through an electronic processing unit to a computer that provides information analysis and display [1]. The disadvantage of these devices is the contact method of information retrieval, which dramatically reduces functionality and accuracy.

 Closest to the claimed device is a coordinate measuring machine [2]. It is a horizontal table, made with the ability to move along two coordinate axes of the horizontal plane. The measured product is installed on the table. A means for collecting information is a sensitive element in the form of a probe connected through a linear displacement sensor, and a processing unit with a computer. The probe is made with the possibility of movement relative to the vertical coordinate axis.

The prototype has several disadvantages:
- very low measurement performance, associated with the need for mechanical contact of the probe with the object and the movement of nodes with large masses and dimensions;
- in point-by-point scanning of a controlled surface, the scanning step is limited by the contact surface area of the probe;
- mechanical contact of the probe with the surface of the controlled product imposes restrictions on the surface roughness and its rigidity and mechanical strength;
- the need for accurate calibration of the contact force of the probe with a controlled surface;
- large weight and size characteristics due to the presence of mechanically and kinematically connected elements that ensure the probe is moved along the vertical axis.

 The consequence of these drawbacks is low accuracy and reliability, as well as limited functionality and the high complexity of the measurement process.

 The aim of the invention is to remedy these disadvantages, namely the creation of a high-precision, high-performance and reliable device with wide functionality.

 This goal is achieved in that the device for controlling the size of products with a longitudinal axis of symmetry, containing a horizontal table for installing the controlled product, secured by two drives and two linear displacement sensors, means for acquiring information associated with the control unit and the computer, unlike the prototype, additionally equipped with equipment for installing a controlled product and equipment for angular positioning of a controlled product, a horizontal table for installing a controlled the product is made up of a fixed part and a movable part mounted to move along two mutually perpendicular axes of the horizontal plane, the means for acquiring information is made in the form of a stationary horizontal table fixed above the working space for installing a controlled product of a laser radiation source optically coupled to a stationary mounted under the working the space of the movable part of the horizontal table for the installation of the controlled product by the laser radiation receiver the output of which is connected to the control unit, the second and third inputs of which are connected to linear displacement sensors, and the output is connected to a computer.

 In addition, the goal is achieved in that the working space of the horizontal table for installing the controlled product is made transparent.

 This goal is also achieved by the fact that the control unit contains two primary processing units, the first inputs of which are connected to linear displacement sensors, the second inputs are connected to a laser radiation receiver, and the outputs are connected to a processor unit connected to a memory unit and an interface unit, the output of which is connected with a computer.

 This goal is also achieved by the fact that the equipment for installing the controlled product is located on the working space of the horizontal table for installing the controlled product, two runners of triangular section, the longitudinal axes of which are parallel to the Y axis, and the equipment for angular positioning of the controlled product is an end dividing head made in the form of a disk with holes located around the circumference, and a centering part, the diameter of which is equal to the inner diameter of controlled product, and with the holes of the disk with the possibility of engagement associated spring-loaded retainer, rigidly connected with the skids.

 In FIG. 1 presents a diagram of the inventive device; in FIG. 2 is an example of a specific implementation of a tooling for positioning a controlled product.

 A device for controlling the dimensions of products with a longitudinal axis of symmetry contains a horizontal table 1 for installing the controlled product, having two independent drives for moving it along two mutually perpendicular axes of the horizontal plane 2 (along the X axis) and 3 (along the Y axis), for measuring which the table equipped with linear displacement sensors 4 and 5 (along the X and Y axis, respectively). On the surface of the movable part of the table there is a snap-in 6 for installing and positioning the product 7 to be controlled. A laser radiation source 8, optically coupled to a radiation receiver 9, which can be used as a photodiode, is fixedly fixed over the working space of the table. The radiation receiver 9 is mounted on a fixed part of the table 1 under its movable part. The output of the radiation receiver is connected to the inputs of the primary processing units 10 and 11 of the control unit 12. The second inputs of the primary processing units 10 and 11 are connected to the linear displacement sensors 4 and 5, and the outputs are connected to the processing unit 13 connected to the memory unit 14 and the interface unit 15 the output of which is the output of the control unit 12 and is connected to the computer 16.

 Equipment 6 for installing the controlled product 7 is two parallel runners of a triangular, for example, section, the longitudinal axis of which is parallel to the Y axis. To ensure optical coupling of the radiation source 8 and radiation receiver 9, the working space of the movable part of the table 1 is made transparent. Equipment for positioning the controlled product is an end dividing head 17 (Fig. 2), made in the form of a disk with holes 18 located around the circumference. A spring-loaded latch 19, rigidly mounted on the table surface, is functionally connected by a dividing head 17 through holes 18. The centering part 20 of the dividing disk has a diameter equal to the inner diameter of the controlled product 7.

 The inventive device operates as follows.

 A controlled product (for example, an internal combustion engine piston) 7 is mounted on the centering part 20 of the dividing head 17. Then it is mounted on the skids 6. With the help of a spring-loaded latch 19, which enters one of the holes 18 of the end dividing head 17, the product is fixed in the desired angular position. Since the longitudinal axis of the runners 6 coincides with the Y axis, the longitudinal axis of the controlled product 7 also coincides with the Y axis. The table 1 drives are turned on and it begins to move with the controlled product so that the stationary laser beam from the radiation source 8 scans the entire side surface of the controlled product on fixed angular position. When crossing the lateral edge of the surface (the border of light and shadow), the beam overlaps from the source 8. The signal from the receiver 9 captures information about the coordinates of the edges from linear displacement sensors 4 and 5 in the primary processing units 10 and 11 of the control unit 12. The processor unit 13 performs information from blocks 10 and 11 and controls the interface unit 15, which generates a serial code for transferring it to an external computer 16. The processor unit 13 is controlled by programs stored in the memory unit 14. About zvedy control airfoil surface at one angular position output latch 19 out of engagement with the hole 18 of the dividing apparatus 17, a product is turned and the control process is repeated.

 The scanning step and the piston surface bypass algorithm are set programmatically in accordance with the drawing. In the most critical places, the scanning step may be small.

 The inventive device provides high-precision speed control, which expands its functionality compared with the prototype. In addition, it has a simpler design and small mass-dimensional parameters, which positively affects the reliability of the device.

Claims (4)

 1. A device for controlling the size of products with a longitudinal axis of symmetry, comprising a horizontal table for installing a controlled product, equipped with two drives and two linear displacement sensors, means for acquiring information associated with the control unit and a computer, characterized in that it is additionally equipped with accessories for installation of the controlled product and equipment for angular positioning of the controlled product, a horizontal table for installing the controlled product is made of a fixed hour and the movable part installed with the possibility of moving along two mutually perpendicular axes of the horizontal plane, the means for acquiring information is made in the form of a horizontal table fixed to the working space to install a controlled product of a laser radiation source that is optically coupled to the movable horizontal part fixed under the working space a table for installing a controlled product with a laser receiver, the output of which is connected to the unit systematic way, second and third inputs of which are connected with the linear displacement sensor, and an output connected to the computer.  2. The device according to claim 1, characterized in that the working space of the horizontal table for installing the controlled product is made transparent.  3. The device according to claim 1 or 2, characterized in that the control unit contains two primary processing units, the first inputs of which are connected with linear displacement sensors, the second inputs are with a laser radiation receiver, and the outputs are connected to a processor unit connected to a memory unit and an interface unit whose output is connected to a computer.  4. The device according to claim 1 or 2, or 3, characterized in that the equipment for installing the controlled product is located on the working space of the horizontal table for installing the controlled product two runners of triangular section, the longitudinal axis of which is parallel to the Y axis, and the equipment for the angular positioning is an end dividing head, made in the form of a disk with holes located around the circumference, and a centering part, the diameter of which is equal to the inner diameter of the controlled product lia, and with the holes of the disk with the possibility of engagement associated spring-loaded retainer, rigidly connected with the runners.

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