157 results about "Axial Loadings" patented technology

The invention discloses a torsion tensile testing machine which comprises a rack, a first main shaft, a coupler, a tensile driving assembly and a first torsion driving assembly, the first main shaft is connected with one end of the test piece, the test piece is installed on the rack, the coupler comprises a pulling plate and two bearings, a convex disc is arranged in the middle of the first main shaft, the two bearings are arranged on the first main shaft in a sleeving mode and located on the two sides of the convex disc respectively, and the stretching driving assembly is connected with the pulling plate. The stretching driving assembly applies an axial load to the first main shaft through the pulling plate, and the first torsion driving assembly applies a torsion load to the test piece. The tension and compression load and the torsion load from the tension driving assembly and the first torsion driving assembly are integrated to the first main shaft through the coupler, the first main shaft is utilized to apply the set static or dynamic tension and compression load and torsion load to the test pup joint at the same time, and various complex stresses borne by a drill rod of the top drive drilling machine during working are simulated. Technicians are helped to evaluate and test the performance of the short circuit more truly.

A method and apparatus for testing a specimen with pressure, applying a torque using one or more plates coupled to the test specimen, applying a bending moment, and / or applying an axial load, either separately or simultaneously, with or without rotating the specimen, and without the applied forces interfering with each other.

The utility model relates to the technical field of bearing performance tests, in particular to a device for testing durability and dry running performance by simulating the working condition of a bearing. The main shaft is arranged on the shell and is provided with an end part accompanying test bearing, two middle part accompanying test bearings and a test bearing; the first end sleeve sleeves the outer ring of the end part accompanying test bearing; the first universal piece square iron sleeves the outer diameter of the first end sleeve; the radial load loading end portion abuts against the middle lining so as to transmit the radial load to the test bearing through the two middle accompanying test bearings and the main shaft in sequence. The bushing sleeves the outer ring of the test bearing, and a plurality of oil passing holes are uniformly formed in the circumference of the bushing; the second end sleeve is sleeved on the bushing; the axial load loading end portion abuts against the vertical plate so as to transmit the axial load to the test bearing through the second universal piece square iron, the second end sleeve and the lining in sequence. According to the utility model, axial and radial loads can be loaded on the test bearing, a working condition lubrication mode can be simulated in the test process, the operation stability is maintained, and unbalance loading is prevented.

An axial load support member (17, 19, 28, 30, 32, 34, 38, 40) and method of manufacture achieves high load bearing capability with reduced weight and volume. A member is made by a process that includes providing at least three chamber profile preforms (2), each of which is comprised of a pair of deformable metal sheet walls (3) which bound a sealed internal chamber (14). After providing the preform the method includes in any order, a joining step and a fluid pressure delivering step. The joining step includes joining the at least three preforms together along a central member axis (4). The pressure delivery step includes delivering fluid pressure to the respective chamber of each preform such that the walls thereof are deformed and extend further away from one another with increased radial distance away from the central member axis.

The present invention belongs to the technical field of material experiment, and discloses a sling tension-bending fatigue experiment device. The device includes a reaction frame, an axial force loading module, an anchoring module, a bending loading module, a clamping module and a protection module. Among them, the axial force loading module, the anchoring module and the protection module are arranged on the columns of the reaction frame, the bending loading module is arranged on the cross beam of the reaction frame, and the clamping module is anchored to the ground. The axial force loading module is used to apply axial load, the anchoring module is used to fix the specimen, the bending loading module is used to apply bending load for tension-bending, both the clamping module and the bending loading module can control the bending load received by the specimen, and the protection module is used to prevent injuries caused by specimen fracture; The present invention provides a fatigue experiment device capable of simultaneously performing axial tension and bending, and obtaining various fatigue performance indexes of steel strands or parallel steel wires through tension-bending fatigue experiments, which is applicable to sling tension-bending fatigue experiments.

The invention relates to the technical field of bearing detection, in particular to a double-station hub bearing mud simulation testing machine which comprises an experiment box, a digital display controller, a mud supply container and two simulation test units located in the left side and the right side of the experiment box respectively. The simulation test unit comprises a driving mechanism, a hub bearing supporting mechanism, an axial load loading mechanism, a radial load loading mechanism and a slurry spraying mechanism, the hub bearing supporting mechanism comprises a main shaft, one end of the main shaft is connected with the driving mechanism, the other end of the main shaft is connected with an inner ring of the hub bearing, the axial load loading mechanism is connected to the main shaft, and the radial load loading mechanism is connected to the inner ring of the hub bearing. The radial load loading mechanism is connected to the outer ring of the hub bearing; the slurry spraying mechanism comprises an annular spraying pipeline connected with the slurry pump and spraying heads arrayed on the annular spraying pipeline, and a stop valve is arranged between every two adjacent spraying heads. According to the invention, more accurate measurement of the hub bearing load and multi-working-condition detection of a mud experiment can be realized.

The embodiment of the invention provides a distributed testing system and method for the axial force of an offshore wind power structural member, the structural member is provided with a plurality of measurement sections perpendicular to the axial direction, and the distributed testing system for the axial force of the offshore wind power structural member comprises a plurality of sets of strain sensors symmetrically arranged on the measurement sections; each group of strain sensors comprises two strain gauges, and the mounting directions of the two strain gauges are vertical and adjacent to each other; the welding terminal piece is connected with the multiple groups of strain sensors; and the data acquisition instrument is connected with the welding terminal piece through a six-wire system and is used for acquiring data of the strain sensor of each measurement cross section and testing the axial load of the structural piece according to the data of the strain sensor of each measurement cross section. According to the embodiment of the invention, a symmetrical multi-point distributed axial force measurement mode is adopted, so that the average axial force is formed, the precision is higher, the considered position is more comprehensive, and the situation that the accuracy of the axial force of the whole section is influenced by an inaccurate local test result is avoided; and the detection accuracy is improved.

The invention discloses a tensile test device and method based on a pressing-to-pulling mode, and relates to the technical field of tensile tests. A tensile test method of a test piece under high temperature and high stress is realized, and the problems of stress concentration, difficulty in test piece preparation and the like in the existing tensile test are solved. The device comprises an axial loading mechanism, a confining pressure heating mechanism, a data acquisition mechanism and a control module, and the axial loading mechanism is connected with two ends of a test piece and is used for applying an axial load to the test piece; the confining pressure heating mechanism surrounds the periphery of the test piece and is used for applying circumferential pressure to the test piece and heating the test piece; the data acquisition mechanism is used for acquiring tension, temperature and deformation of the test piece under load; the signal output end of the control module is connected with the signal input ends of the axial loading mechanism and the confining pressure heating mechanism, and the control module is used for controlling starting and stopping of the axial loading mechanism and the confining pressure heating mechanism; the signal input end of the control module is connected with the signal output end of the data acquisition mechanism and used for receiving data acquired by the data acquisition mechanism.

The application relates to the technical field of bearings, in particular to a double-inner-ring double-row angular contact ball bearing which comprises an outer ring, two inner rings are arranged on the inner side of the outer ring, a retainer is arranged between the inner rings and the outer ring, a plurality of rolling balls in annular array arrangement are slidably embedded on the surface of the retainer, the surface of the rolling balls is in contact with the inner wall of the outer ring and the outer surface of the inner rings, and a sealing ring is slidably embedded on the face of each of the two inner rings away from each other. In the using process, the bearing is convenient to assemble, the two retainers and the sealing ring form a relatively integrated structure, the structural strength is effectively improved, compared with a traditional double-row angular contact ball bearing, the axial bearing capacity of the bearing is remarkably improved, the load borne by a single rolling body and a raceway is reduced, the risk of fatigue failure is reduced, meanwhile, the design enhances the capacity of the bearing to simultaneously bear axial load and radial load, and solves the problem that the traditional double-row angular contact ball bearing is difficult to apply under complex working conditions.

The invention relates to a device and a method for measuring radial strain and micro-deformation of pyrolysis of oil-rich coal. The device comprises a pressure chamber, and a pressure chamber inner cylinder is arranged in an inner cavity of the pressure chamber; a gas confining pressure chamber is formed between the outer wall of the pressure chamber inner cylinder and the inner wall of the pressure chamber; the annular heating sleeve sleeves the outer side of the pressure chamber; the displacement measuring structures are arranged on one side of the annular heating sleeve, and each displacement measuring structure corresponds to one protruding structure and is connected with the corresponding protruding structure; the stress applying structure is arranged at the lower end of the other side of the annular heating sleeve and is communicated with the gas confining pressure chamber; the temperature sensor is communicated with the gas confining pressure chamber; and the axial load loading mechanism is positioned above the pressure chamber. The radial strain capacity of the coal rock can be conveniently measured under the conditions of high temperature and triaxial stress loading, meanwhile, the radial micro-deformation of the coal rock is monitored, and the problem that the radial deformation is difficult to measure in the stress loading process of the coal rock under the high temperature condition is solved.

The invention provides a device suitable for a spinning process grid reinforced cylindrical shell structure shaft bending shear loading test, and relates to the technical field of mechanical property test, and the device comprises a portal frame, an axial loading mechanism, a transverse loading mechanism, a first connecting mechanism, a test piece, and a second connecting mechanism; the upper portion and the lower portion of the test piece are fixedly connected with the first connecting mechanism and the second connecting mechanism respectively, the portal frame, the second connecting mechanism and the transverse loading mechanism are fixedly connected to the ground or a trench, the axial loading mechanism is installed on the portal frame, and the first connecting mechanism, the test piece and the second connecting mechanism are located under the axial loading mechanism. The axial loading mechanism is used for being in contact with the upper part of the first connecting mechanism to realize axial loading of the test piece; the transverse loading mechanism is used for making contact with the side face of the first connecting mechanism, and transverse loading of the test piece is achieved. The device can be universally used in a certain size range of a test piece, a transverse load and an axial load do not interfere with each other, and it is guaranteed that the axial bending shear load can be accurately loaded.

The invention provides a method for predicting rock permeability in an elastic-viscoelastic-viscoplastic deformation stage, and belongs to the technical field of rock permeability prediction. In order to effectively predict permeability evolution trends of rocks in different deformation stages and overcome the defects in the prior art, the invention provides a method for predicting permeability of rocks in an elastic-viscoelastic-viscoplastic deformation stage. Obtaining triaxial compressive strength data of the rock under different confining pressure level conditions; setting a creep stress level, and performing a rock sample creep-seepage experiment to obtain axial deformation data of the rock sample and gas pressure data of a gas inlet end and a gas outlet end of the sample; the axial load of the rock sample is unloaded to a hydrostatic pressure state, the confining pressure is kept unchanged, and a seepage experiment in a pressure relief deformation recovery stage is carried out; the method is applied to calculation and prediction of the rock permeability.

To avoid interference between a radial retainer and an axial retainer.SOLUTION: A motion guide device 1 comprises a radial retainer 40 that holds a plurality of first rolling elements 31 that receive a radial load among a plurality of rolling elements 30, and an axial retainer 50 that holds a plurality of second rolling elements 32 that receive an axial load, as retainers for holding the plurality of rolling elements 30 interposed between an inner ring 10 and an outer ring 20. A pair of bands 52, 53 of the axial retainer 50 are arranged on both radial sides of a plurality of partition walls 51 of the axial retainer 50, and of the pair of bands 52, 53, one band 53 that is arranged on the radial retainer 40 side has a smaller radial dimension than the other band 52 that is arranged on the opposite side of the radial retainer 40.SELECTED DRAWING: Figure 3

The invention relates to the technical field of wind power generation tests, and discloses a wind power tower load loading test device and an evaluation system.The wind power tower load loading test device comprises a test bed, a loading structure and a load actuation structure; by arranging the loading structure and the load actuating structure, vertical axial force, bending moment, horizontal shearing force and torque can be applied to a test piece at the same time, and the test device is closer to the actual stress working condition compared with a traditional loading mode, so that the accuracy and reliability of test data are improved; the first actuator is arranged perpendicular to the upper end face of the loading piece so as to simulate the axial load and bending moment effect borne by the wind power tower in the operation process. The second actuator is arranged perpendicular to the side face of the loading part so as to apply shearing force and torque, multi-dimensional combined loading is achieved, and mechanical property analysis of complex load combination is facilitated; the loading mode is controlled through the actuator, the controlled and accurate load applying process is achieved, manual intervention is reduced, and the test efficiency and consistency are improved.

The present invention belongs to the technical field of aviation speed reducer rotor shaft equipment, and specifically relates to a method for measuring the clearance of a speed reducer rotor shaft tapered bearing and a method for manufacturing the same. One method for measuring the clearance of a speed reducer rotor shaft tapered bearing includes a stop mechanism and an axial loading mechanism; the axial loading mechanism is used to apply an axial force to the rotor shaft of the speed reducer rotor shaft assembly from bottom to top, and the stop mechanism is arranged above the axial loading mechanism, and is used to guide the rotor shaft of the speed reducer rotor shaft assembly; the measuring method includes the following steps: the speed reducer rotor shaft assembly is arranged on the axial loading mechanism, and a micrometer is arranged on the speed reducer rotor shaft assembly; the axial loading mechanism applies an axial force F to the speed reducer rotor shaft; and the clearance value measured by the micrometer is obtained. The present invention applies an axial load to the rotor shaft by pushing from bottom to top, which effectively avoids unbalanced load and improves the accuracy of the tapered bearing clearance measurement.

The application discloses a kind of corrosion-mechanical coupling in-situ loading's anchor rod performance test system, belong to anchor rod performance test technical field.The application is by being arranged between the upper and lower clamps of fatigue testing machine, realize the in-situ test of anchor rod under the synchronous action of salt fog corrosion and axial load, apply constant load, cyclic load or impulse type disturbance load, simulate the influence of mining disturbance and corrosion environment suffered in the long-term support process of anchor rod;Adjusting salt concentration, pH value, temperature and humidity and spray cycle, spraying mode and dry-wet cycle, realize acid / neutral / alkaline, high temperature and high humidity and water erosion environment simulation and accelerated corrosion, environment warehouse is independently installed by adjustable support, does not bear the axial test load of anchor rod, cooperate upper and lower dynamic sealing piece to ensure loading accuracy and reduce salt fog leakage, corrosion and mechanical parameters are synchronously collected by control and data acquisition system, provide basis for evaluating complex environment anchor rod corrosion rate, corrosion mechanism, damage evolution and residual life.

This invention relates to the field of spacecraft attitude control technology, and more particularly to an ultra-precise and ultra-stable on-orbit adaptive control method and system for pointing under additional stiffness disturbances. This on-orbit adaptive control method, by applying specific excitations to actuators and measuring their responses, combined with a recursive filtering algorithm, can accurately identify the total actuator stiffness, including the additional stiffness of the cable, in real-time on-orbit, overcoming problems caused by differences in ground testing environments and time-varying stiffness. Based on the real-time identified stiffness values, the parameters of the axial compensation controller and the actuator compensation controller are dynamically adjusted, enabling the control system to adapt to changes in the additional stiffness of the cable and maintain excellent control performance at all times. By employing dual compensation control at the axial load level and the actuator level, additional stiffness disturbances are synergistically suppressed at both the overall system and local actuator levels, improving the comprehensiveness and accuracy of control, and achieving ultra-precise and ultra-stable on-orbit adaptive control for pointing under cable additional stiffness disturbances.

A method and apparatus for testing a specimen with pressure, applying a torque using one or more plates coupled to the test specimen, applying a bending moment, and / or applying an axial load, either separately or simultaneously, with or without rotating the specimen, and without the applied forces interfering with each other.

The reversing loading device for reversing loading bearing test of aero-engine belongs to the field of aero-engine main shaft bearing test. It comprises a cylinder fixing seat, a left axial loading cylinder, a right axial loading cylinder, a limiting screw, a tested bearing seat, a tested bearing fixing nut and a tested bearing inner ring cover. The left and right sides of the cylinder fixing seat are respectively provided with the left axial loading cylinder and the right axial loading cylinder. The outer side wall of the tested bearing is installed in the cylinder fixing seat through the tested bearing seat of the cylinder fixing seat. The limiting screw is threadedly connected to the cylinder fixing seat, and the bottom of the limiting screw is tightly combined with the outer side wall of the tested bearing seat. The tested bearing inner ring is provided with the tested bearing inner ring cover. The purpose is to solve the problems of lacking of a loading device which can simulate the axial load size and direction and independently and continuously change according to the test load spectrum in the existing aero-engine main shaft bearing test. The device has the technical advantages of simple structure and ingenious design.

The invention discloses a cascade type loading system and method for a curved surface wallboard shear load test. The system comprises a fixed end assembly, a movable end assembly and a cascade system. The cascade system is formed by connecting a plurality of shearing force loading units in series in a hinged mode and is connected between the fixed end assembly and the movable end assembly. A reverse load is applied to a pair of torsion actuators of the movable end assembly to form a torque, the torque is transmitted through a cascade system, and a uniform shear load is generated in the longitudinal direction of a test piece. Through the modular and cascaded design, high-uniformity application of the shear load and effective decoupling of the axial load are achieved.

The utility model relates to the technical field of bearing vibration testing, in particular to an axial loading tool applied to a bearing vibration test, which comprises a T-shaped sleeve, a sleeve connecting block, a force sensor, a ball head connecting block and an annular loading piece, the T-shaped sleeve comprises a sleeve part and a connecting ring plate arranged at one end of the sleeve part; the sleeve connecting block is fixed on the connecting ring plate; the force sensor is connected with the sleeve connecting block; the ball head connecting block is connected with the force sensor; the annular loading piece comprises a loading cylinder part and a connecting part arranged at an opening in one side of the loading cylinder part, the center of the connecting part is provided with a concave spherical surface, the concave spherical surface is matched and movably connected with the ball head connecting block, and the annular end surface on the other side of the loading cylinder part provides an axial load annular contact surface. According to the utility model, the end face of the bearing is uniformly stressed, the force sensor is additionally arranged in the middle to display the change of a load value in real time, the dynamic rigidity of the bearing can be tested by using the tool in cooperation with a displacement sensor, and the bearing vibration test data is more accurate.

The embodiment of the invention discloses a multi-row angular contact thrust ball bearing, which comprises an inner ring, an outer ring and a rolling body arranged between the inner ring and the outer ring, the outer surface of the inner ring is provided with a plurality of rows of raceways, and the diameters of the plurality of rows of raceways are gradually reduced from left to right; the inner surface of the outer ring is provided with a plurality of rows of raceways in one-to-one correspondence with the raceways on the outer surface of the inner ring, and the diameters of the plurality of rows of raceways are also gradually reduced from left to right; and the rolling bodies are arranged in each row of raceways between the inner ring and the outer ring. According to the multi-row angular contact thrust ball bearing disclosed by the embodiment of the invention, the axial load is greatly improved while the radial load is ensured, and the multi-row angular contact thrust ball bearing can be used in occasions with special requirements on the axial load, the radial load and the axial and radial combined load.

A loading device for testing a large-scale precision weak rigidity turntable includes a support frame, a support chassis, a test frame, a central shaft, a bearing, and a loading assembly; the support frame is a portal frame structure, the support chassis is fixed to a ground rail platform or the ground at the center of the support frame, the central shaft is vertically arranged at the center of the support chassis and the test frame, and the bearing is arranged on the outer edge of the upper end of the central shaft; the loading assembly includes an axial load loading pulley group, an overturning moment loading pulley group, a radial load loading pulley group, a wire rope, and a counterweight block. The structure of the present invention is simple, safe and reliable, and has high test accuracy. The counterweight gravity is loaded onto the rotating platform through the pulley group, which is easy to operate and has a lower manufacturing cost than other loading methods; the test turntable drives the test frame to rotate around the central axis, and applies axial force, radial force, and overturning moment in the rotating state, which can simulate the stress state of the test turntable under actual working conditions and provide reliable test data support for actual users of the test turntable.

The present invention discloses a one-dimensional soil column freezing-seepage intelligent regulation system and a testing method under axial loading, specifically relating to the technical field of soil seepage. The system includes a one-dimensional soil column freezing apparatus, a freezing cycle device, an axial loading device, and a seepage device. The one-dimensional soil column freezing apparatus includes a soil column mold and a freezing chamber. The freezing chamber is connected to the freezing cycle device for unidirectionally freezing the soil body. The axial loading device is used to apply an axial load to the soil body. The seepage device includes a PID controller, a seepage liquid storage tank, a seepage inlet pipe, a seepage outlet pipe, a peristaltic pump, and a flowmeter. Both the seepage inlet pipe and the seepage outlet pipe are connected to the soil column mold. The peristaltic pump connected to the seepage inlet pipe and the flowmeter connected to the seepage outlet pipe are both connected to the PID controller. The PID controller can adjust the delivery flow rate of the peristaltic pump according to the signal output by the flowmeter. The present invention can maintain the stable seepage of the soil body in the freezing test and improve the accuracy and reliability of the test results.

The present invention comprises: an inner ring (2); an outer ring (3); a plurality of balls (4) disposed between the inner ring (2) and the outer ring (3); circumferential grooves (5) formed on an outer diameter surface of the outer ring (3); an insulating layer (6) having insulating properties and provided on the outer diameter surface of the outer ring (3) so as to be fitted into the circumferential groove (5); and a rotating shaft body (7) fitted into an inner diameter surface side of the inner ring (2). In an operating state of the bearing, the circumferential grooves (5) are formed so as not to overlap with either an extension of a composite load (F) toward the inner diameter side nor an extension of the composite load (F) toward the outer diameter side, the composite load (F) being a resultant force of a radial load (F1) and an axial load (F2) acting on the inner and outer rings (2, 3) from the balls (4).

The invention discloses a bearing rigidity indirect measurement method and system based on system error compensation, and the method comprises the following steps: installing a standard sample block in a test system, applying an axial load, measuring a first deformation amount of the standard sample block under each stage of load, and recording the first deformation amount as a system deformation amount; installing a measured bearing, applying axial loads of all levels which are the same as the axial loads of the step S1, measuring a second deformation amount of the measured bearing, and recording the second deformation amount as a total deformation amount; according to the obtained total deformation amount and the system deformation amount, calculating the real deformation amount of the measured bearing under each level of load; and determining a load-deformation function relationship based on a corresponding relationship between each stage of axial load and the real deformation amount, and obtaining the rigidity of the measured bearing. Compared with the prior art, the standard sample block is introduced for comparison testing, a system error compensation mechanism is innovatively provided, errors caused by self deformation of a testing system can be accurately eliminated, the real deformation amount of the bearing is obtained, the rigidity measurement precision is greatly improved, and the method is particularly suitable for accurate calibration of the high-rigidity bearing.

A clamping and rotating feeding device comprises a feeding slide, a rotating mechanism and a clamping mechanism arranged from bottom to top, wherein the feeding slide used for reciprocating feeding is provided with a slide mounting plate capable of linear motion; the rotating mechanism is provided with a rotating base and a T-shaped rotating table, the T-shaped rotating table can rotate relative to the rotating base, and the rotating base is fixed on the slide mounting plate; the clamping mechanism used for clamping the product is assembled on the T-shaped rotating table. The beneficial effects of the present invention are embodied in the following aspects: 1. It can realize one-time feeding, and the two ends of the product can be processed after turning around and rotating 180°, thus reducing one process step; 2. The torque output by the rotating cylinder is amplified and transmitted to the rotating shaft through the gear pair, thus increasing the torque of the rotating shaft, and the bearing groups arranged at both ends of the rotating shaft can withstand larger axial loads and radial loads, thus solving the problem that the torque of the rotating cylinder is small and easy to be damaged; 3. The rotating base does not rotate, and the pipeline does not rotate, thus not interfering with the processing and disassembly of the workpiece.

The invention discloses an asphalt mixture design method, computer equipment and a storage medium, and relates to the field of asphalt mixtures. Wherein the asphalt mixture comprises mineral aggregate and asphalt, and the mineral aggregate comprises a coarse aggregate mixture, a fine aggregate mixture and mineral powder; the design method comprises the following steps: constructing a three-dimensional discrete element model; applying a preset radial load and a preset axial load to obtain a mechanical response model; coarse aggregate particles in the mechanical response model form a plurality of contacts under the action of the radial load and the axial load, and the contact force and the vector of each contact are extracted; constructing a weighted fabric anisotropy coefficient; determining the optimal gradation of each grade of coarse aggregate according to the relationship between the weighted fabric anisotropy coefficient and the axial strain thereof under the preset load; determining the grading of each grade of fine aggregate in the fine aggregate mixture according to a filling rule; and determining the proportion of the coarse aggregate mixture and the fine aggregate mixture. According to the invention, the defect of poor correlation between a volume design method and pavement performance is overcome, and the designed gradation has excellent mechanical properties.

This invention relates to a C f The method for determining the cutting depth of SiC ceramic matrix composites first involves conducting nano-scraping tests to obtain the three-dimensional morphology, scratch depth, scratch force, and axial load variation curves of the nano-scratches along various directions with the scratch distance. Then, the scratch depth range corresponding to the microscopic brittle fracture domain is determined when scratching along a single direction. This process is repeated to obtain the scratch depth range corresponding to the microscopic brittle fracture domain along various directions. Finally, the depth of cut for SiC is determined. f When machining SiC ceramic matrix composites, the scratch direction is determined, and the corresponding scratch depth range corresponding to the microscopic brittle fracture domain is identified, which is then used as the cutting depth range. This invention controls the cutting depth within the scratch depth range corresponding to the microscopic brittle fracture domain, achieving material removal without causing excessive cutting forces, severe tool wear, or short tool life due to excessive cutting depth or the high hardness of the material.

The utility model provides an angular contact ball bearing life test axial loading device, which comprises a core shaft, a locking screw arranged at one end of the core shaft and an axial loading block, a shaft end gland is clamped between the core shaft and the locking screw, one end of the shaft end gland is arranged corresponding to an inner ring of a test bearing, a loading ball is arranged on the locking screw in a pressing manner, and the axial loading block is arranged on the loading ball. The loading ball is clamped between the locking screw and the axial loading block, and the axial loading block carries out service life test axial loading on the inner ring of the test bearing through the loading ball and the shaft end gland under the axial load of the loading head of hydraulic loading or electric cylinder loading. The utility model provides a tool capable of directly carrying out axial loading on the service life test of the inner ring of the angular contact ball bearing, so as to meet the service life verification of the tested bearing under special working conditions, and has the characteristics of simple structure and convenience in operation.