Two-coordinated friction machine

FIELD: test equipment.

SUBSTANCE: machine can be used for testing materials and lubricant matters for complicated trajectories relatively movement of interacting friction pairs. Two-coordinate friction machine has base, sample's holder, two-coordinate drive, counter-body's holder, loading mechanism interacting counter-body, two-component force detector connected with counter-body's holder, program control system and friction force main vector instant value automated estimation system. Two-coordinate drive is made in form of two independent movable carriages which move at mutual-perpendicular directions. Holder of flat sample is disposed onto one carriage and counter-body's holder, loading mechanism interacting with holder and two-component force detector connected with holder of counter-body are disposed on the other carriage. Program control system is made in form of control computer connected with independent control modules and with electric engines through matching unit. Electric engines drive two-coordinated drive into motion to provide movement of indicator which interacts with working surface of sample along continuous nonlinear two-dimensional trajectory.

EFFECT: widened functional abilities; improved precision; better truth of result.

4 cl, 1 dwg

 

The invention relates to the field of materials testing, namely, devices for testing materials and lubricant in organizing complex trajectory of the relative motion of the interacting pairs of friction.

A known device for determining the anisotropy of the physical-mechanical properties of the surface layer of a solid body (USSR author's certificate No. 195686, CL G 01 N 3/44, 1972)containing the sample holder, two-coordinate drive movement of the holder, the indenter, interacts with the loading mechanism associated with the indenter force sensor.

The drawback of the device is similar narrow scope, limited opportunity to test material on the micro-scratching, because the device as indenter uses diamond pyramid, and also has a manual two-drive movement of the holder, which is controlled by the pilot, which greatly reduces the accuracy and makes it impossible for its application for cyclic testing of materials.

The closest to the technical nature of the claimed device is selected as a prototype device for determining the anisotropy of the physical-mechanical properties of the surface layer of a solid body (USSR author's certificate No. 665244, CL G 01 N 3/44 // G 01 N 19/02, 1979), containing the sample holder, two-dimensional actuator displacement d is rates, the indenter, interacts with the loading mechanism associated with the indenter two-component force sensor.

A disadvantage of the known device the prototype is a low performance because the test result is one direction of movement of the indenter on the surface of the test sample, in which the main action of the friction force vector will correspond to a given ratio of components of the component set by the researcher. Therefore, conducting integrated assessments on the surface in different directions requires a large number of tests, which reduces the efficiency of the device when the determination of physical and mechanical properties of materials, in particular when determining the wall friction anisotropy properties.

The drawback of the device of the prototype can be attributed to the inability of the organization controlled movement of the indenter on the surface of the sample by a complex linear trajectories of motion (reciprocating, reciprocative shifting the diameter of the indenter, zigzag, etc. which are the most typical type friction machines, devices and mechanisms), and in the most General case of nonlinear trajectories of motion, which is caused by the use of analog control system two-axis actuator of the sample holder.

what dostatkom device is the lack of a registration system for instantaneous values of the principal vector of the friction force, because although the system is a two-component sensor of the friction force and its outputs are associated with automatic analog compensator included in the control system of a two-coordinate drive of the device.

The objective of the invention is to enhance the functionality and performance of the device and increase the accuracy of determination of friction forces.

Tasked with expanding the functionality and performance of the device is solved by the fact that friction machine is equipped with a system management software that implements a nonlinear trajectory of the relative motion samples for schema indenter plane" and is made in the form of a computer connected through a matching device with two independent modules motor control two-axis actuator, and the biaxial actuator is designed as two independent movable carriages moving in mutually perpendicular directions, one of the carriages is the holder of a flat sample, and on the other a holder contrapasso associated with the mechanism of loading and two-component force sensor.

This allows investigation of the friction pairs in the organization of nonlinear continuous two-dimensional trajectories of the relative motion, which is necessary when testing m is materials, with a strong anisotropy of the surface layer, also in the development of systems managed frictional interaction of materials and products, in particular, this device allows for the evaluation of the frictional properties of materials (USSR author's certificate No. 1388769, CL G 01 N 19/02, 1979. The method for determining the anisotropy of surface physico-mechanical, mainly friction, material properties). The design of movable carriages, biaxial actuator allows for testing of materials in the presence of the working environment (lubricating or abrasive), the holder of a flat sample is placed in the vessel with the medium, which is installed on one of the carriages moving in the horizontal plane.

The goal of improving the accuracy of determination of friction forces is solved in that two friction machine is equipped with a system for the automated assessment of the instantaneous values of the principal vector of the friction force, consisting of a host computer connected through a matching device with two independent analog-to-digital converters, implementing the agreed time evaluation values of the signals of the individual component of the main vector of the friction force acting in the plane of the friction in mutually perpendicular directions and coming from the strain gauge element is s two-sensor power through analog amplifiers. Under current instantaneous values of the individual components of the vector of the friction force is estimated as the value of the vector, and its spatial position in the plane of the interaction between the indenter with the working plane of the sample.

The system management software and automated evaluation of instantaneous values of the principal vector of the friction force function as a hardware-software complex and use common software, the control computer and the matching device, which eliminates misalignment processes control the movement of the test samples and the collection of information. This provides a high degree of automation, which increases the accuracy and repeatability of the maintenance of the set of motion parameters of the indenter in a predetermined path on the surface of the sample by serial, cyclic testing of materials.

Marked features two friction machines allow you to more fully realize the potential of the test schema indenter plane", especially in terms of the interaction of friction pairs with a distinct anisotropy of physical-mechanical properties of surface layer material.

The figure schematically depicts a two-coordinate friction machine.

Two friction machine includes a holder 1 of sample 2, the holder 3 of the counterbody 4, in imagestudio with the holder 3, the loading mechanism 5, associated with the holder 3-component force sensor 6, two-dimensional actuator, consisting of a base 7 and the frame 8, the carriages 9 and 10, respectively installed on the base 7 and the frame 8 in the guide rails (not shown). Linear movement of the carriages 8 and 9 in mutually perpendicular directions is provided by a gear screw-nut 11 and the motor 12, with an independent from each other, the control modules 13 (MU 1 and MU 2), connected through a matching device 14 (SU) to the management computer 15 (PC).

A system for the automated assessment of the instantaneous values of the principal vector of the friction force consists of two measuring channels, each of which contains an analog-to-digital Converter 16 (ADC)connected information and outputs the input of the start conversion by the matching device 14 (SU) to the management computer 15 (PC), and analog input to one of the strain gauge elements of two-component force sensor 6 by means of amplifiers analog signals 17 (1 and 2).

Matching device 14 (SU) provides the required number of channels I / o for external device, and performs the functions of coordination of the levels of the input signals to the computer control of the ADC, as well as signals from the control computer to the ADC (signal Zap the ska conversion) and the control modules 13 (MU 1 and MU 2) two of the friction drive of the machine.

The specific device used the following components: a control on a Pentium class computer; matching device made in the form of interface card installed on the system bus of the computer control, is built on two chips ports I / o KWA, each of which has 24 channels software input / output; to register a separate component of the main vector of the friction force applied strain gauges FSG 15N1 Honeywell, the amplifier of the analog signal RL-4DA200 company RealLab and ADC type F/1; in the control system used engines AEG SO26/48 and the control modules M106 German company Kemo electronic.

The device operates as follows.

Before testing friction machine is in original condition.

The carriage 9 and 10 are in the right (or left) position that provides the convenience of setting the test samples to the appropriate holders 1 and 3, the load is not applied and the samples are not in contact.

The test procedure starts with the automatic installation of the holder 1 sample 2 and the holder 3 counterface 4 at the starting point of the test, which is set in accordance with the testing program and can be anywhere on the working surface of the sample 2.

Next, the operator causes the samples in contact and provides them agrogene by means of the loading mechanism 5.

Further work machine friction is provided in the automatic mode the control program operating on the computer 15 (PC), which supports a given operator, the motion parameters of the counterbody 4 on the surface of sample 2 (the trajectory, speed, number of cycles), by transmitting control signals through a matching device 14 (SU) on the control modules 13 (MU 1 and MU 2), which in turn control the motors 12, biaxial actuator, resulting in movement of the carriage 9 and 10 through a transmission screw-nut 11.

In parallel with the process control biaxial actuator friction machine computer control 15 (PC) are the main components of the vector of the friction force received from the information outputs independent analog-to-digital converters 16 (ADC 1 and ADC 2), each of which converts an analog signal received from one of the strain gauge elements, two-component sensor 6 and amplified by the amplifiers 17 (1 and 2).

After finishing the program tests friction machine stops, with samples of the load is removed and they are removed from the contact, and the carriage 9 and 10 are transferred to the initial state.

1. Two friction machine, containing a base, a sample holder, two-coordinate drive carrier contrapasso associated with IU what Anisman loading and two-component force sensor, characterized in that it is provided by the system management software executed in the form of a control computer connected using a matching device with two independent control units and motors, and system for the automated assessment of the instantaneous values of the principal vector of the friction force, made in the form of a control computer connected through a matching device with two independent analog-to-digital converters connected through analog amplifiers strain gauge elements of two-component force sensor, and a two-coordinate drive is designed as two independent movable carriage mounted on the base and moving in mutually perpendicular directions, one is the holder of a flat sample, and on the other - holder of contrapasso associated with the mechanism of loading and two-component force sensor.

2. Two friction machine according to claim 1, wherein the system management software is executed in the form of a host computer connected through a matching device with two independent control units and electric motors driving the carriage biaxial actuator providing movement of the indenter on the continuous nonlinear two-dimensional trek the Oria.

3. Two friction machine according to claim 1, wherein the automated evaluation of instantaneous values of the principal vector of the friction force is made in the form of a host computer connected through a matching device with two independent analog-to-digital converters connected through analog amplifiers strain gauge elements of two-component force sensor, providing a consistent time measurement of a single component of the main vector of the friction force acting in the plane of the friction in mutually perpendicular directions which are used for estimation of the instantaneous values of the vector of the friction force and its spatial position.

4. Two friction machine according to claim 1, wherein the system management software and automated evaluation of instantaneous values of the principal vector of the friction force work as part of a hardware-software complex, which uses a single control computer and the matching device.



 

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