209results about "Investigating machinability" patented technology

The invention discloses a grinding state and grinding wheel wear monitoring system and method based on multi-sensor fusion, which realize multi-physical-quantity coupling modeling and improve the monitoring precision through cooperative deployment of micro array thermocouples, strain force sensors and vibration sensors and in combination with a time domain and frequency domain feature extraction technology. The system adopts a non-contact power supply design, electromagnetic induction power generation is driven through rotation of the main shaft, real-time signal processing and wireless transmission of a circuit board in the grinding wheel are supported, and the problem of power supply in a high-speed rotation scene is solved. And meanwhile, dimension reduction processing is conducted on the multi-sensor features through an offline network model, self-adaptive adjustment of grinding parameters and ultrasonic amplitude is achieved through dynamic regulation and control logic, and the downtime and the rejection rate are remarkably reduced. The method has remarkable creativity, practicability and economic benefits, fills the blank of fragmentation monitoring and regulation and control lag in the prior art, and improves the stability and machining quality of the grinding process.

The invention belongs to the technical field of machining, and particularly relates to an ultrasonic internal broaching test platform and an ultrasonic vibration mode control method.The test platform comprises a base, a broach and a clamping mechanism, and the clamping mechanism comprises a supporting ring and a clamping sleeve; a clamping groove is formed in the broach, and a protrusion matched with the clamping groove is arranged on the clamping sleeve. A plurality of supporting columns are arranged on the base, and the supporting columns are arranged in a circular shape. The broach is arranged in a space defined by the multiple supporting columns. And a piezoelectric actuator is arranged on the broach. Based on the platform, the invention provides the control method of the ultrasonic vibration mode, modal drift can be optimized and reduced by adjusting the pre-tightening force and the ultrasonic power supply driving frequency, the pre-tightening force is adopted to adjust and stabilize the contact rigidity, and the energy loss can be reduced; through frequency tracking, resonance points are matched in real time, and energy transfer can be maximized; the two modes are cooperatively controlled, response speed and stability are both considered, and the method adapts to high-dynamic loads.

The invention discloses a rock drillability grade prediction method based on fixed bit pressure, and the method comprises the following steps: 1, carrying out fixed bit pressure drilling, and obtaining an actual measurement relation curve between the rock breaking depth and the drilling time; 2, according to the relation between the contact area of the drill bit teeth and the rock and the drilling depth, the relation between the drilling depth and the rock breaking volume of the drill bit is obtained; according to the relation between the drilling depth and the rock breaking volume of the drill bit, a theoretical relation curve between the rock breaking depth and the drilling time is obtained; 3, fitting the actual measurement relation curve and the theoretical relation curve to obtain the rock breaking volume in unit time; 4, obtaining the rock breaking time according to the rock breaking volume per unit time obtained in the step 3; obtaining a corresponding rock drillability grade according to the rock breaking time; while the rock drillability grade is accurately deduced and predicted, the number of experimental groups for drillability grading is effectively reduced, the experimental process is simplified, and the rock core and measurement time is saved.

The application discloses a kind of full life cycle quality monitoring systems of numerical control cutter, including cutter performance evaluation module, cutter factory quality detection module and cutter state monitoring module;The cutter performance evaluation module includes cutting force evaluation module, machining quality evaluation module, life evaluation module and stability evaluation module;The cutter state monitoring module includes data acquisition and transmission module, data preprocessing module, wear prediction model training module and state monitoring module.The application can find problems in time in each link of cutter production and use, and can find cutter with manufacturing defects in time in the process of cutter manufacturing.In the use process of cutter, dullness, chipping and other conditions of cutter can be found in time, to eliminate the security risks caused by it, and improve the quality of product.The application integrates the data generated in each link into database, maximizes the utilization rate of data in each link, and reduces the waste of useful data.

The invention discloses a cutter sharpness testing method and device, and the device comprises a servo motor which is used for providing a driving force; the screw transmission mechanism is connected with the servo motor and is used for converting the rotary motion of the servo motor into linear motion; the sliding seat transmission mechanism is connected with the screw rod transmission mechanism and the cutter and is used for driving the cutter to move along a straight line under the action of the screw rod transmission mechanism; the force signal acquisition unit is used for acquiring a force signal in the material cutting process of the cutter in real time; the programmable logic controller is used for controlling the motion state of the cutter; the upper computer data processing unit is connected with the force signal acquisition unit and is used for receiving and storing the force signal and generating a force-time curve and a power-time curve; and the cutter fixing mechanism is connected with the sliding seat transmission mechanism and is used for fixing a cutter.

The invention discloses a method for evaluating the machinability of sulfur-containing free-cutting steel. The method comprises the following steps: (1) testing the hardness of a section; (2) assigning hardness test data; (3) grade evaluation of sulfide inclusions; and (4) comprehensive assignment calculation is conducted, specifically, the product of the hardness absolute value grade assignment, the hardness standard deviation grade assignment and the sulfide inclusion grade assignment serves as the comprehensive assignment, the turning performance of the materials is sequenced according to the comprehensive assignment, and the smaller the comprehensive assignment is, the easier machining is. According to the evaluation method disclosed by the invention, before the sulfur-containing free-cutting cold-drawing bar is cut, the machinability of the bar is visually evaluated by detecting the hardness, the uniformity of the hardness and the distribution pattern of non-metallic inclusions and through assignment calculation, so that bar processing enterprises can be helped to estimate the processing efficiency and calculate the cost, and the processing efficiency of the bars is improved. And a guiding effect is achieved on enterprise production and operation.

This invention discloses a method and device for measuring the sharpness of a disc cutter. The method calculates the cutting attenuation coefficient of the disc cutter's edge by recording the small wedge angle radius before and after cutting the material. It also establishes curves showing the change in force and time experienced by the disc cutter as it moves along the X and Y axes while cutting the material, dividing the cutting process into three stages. The sharpness of the disc cutter is then calculated based on the work done by the disc cutter in each stage, the small wedge angle radius before and after cutting, the cutting time, the cutting length, and the hardness of the material. Compared to traditional static cutting tests, this dynamic cutting test method can more accurately obtain the sharpness of the disc cutter.

The utility model discloses an anastomat cutting knife detection device which comprises a vertical driving assembly, a transverse driving assembly, a cutting knife testing assembly and a suture line clamp, the cutting knife testing assembly comprises a pressure sensor and a connector unit used for installing an anastomat cutting knife, and the connector unit is assembled at the lifting end of the vertical driving assembly. The suture line clamp comprises a balancing weight, a plurality of threading columns for a suture line to penetrate through and a pressing driver for pressing the suture line, and the transverse driving assembly drives the suture line clamp to move, so that one threading column corresponds to the connector unit; the vertical driving assembly drives the anastomat cutting knife on the connector unit to cut the suture line on the suture line clamp, and the cutting force borne by the anastomat cutting knife is measured through the pressure sensor, so that a manual detection mode can be replaced, and the sharpness performance of the anastomat cutting knife can be accurately, conveniently and reliably detected.

The invention provides alloy blade measuring equipment and a measuring method, the alloy blade measuring equipment comprises a friction mark device used for positioning the deformation protruding position of an alloy blade and a mobile measuring device used for detecting the deformation amount of the alloy blade, and the alloy blade is attached to the friction mark device to rotate and highlights a friction mark. A plurality of identification point positions are distributed on the alloy blade along the friction mark in an outward expanding manner; the mobile measuring device comprises a positioning frame group, a measuring frame assembled on the positioning frame group in a sliding manner, and a measuring assembly assembled on the measuring frame in a sliding manner. According to the method and the device, data acquisition is carried out on the friction impression in multiple directions by taking the identification point position as a base point through the measurement assembly, complete deformation data is obtained, and accurate data support is provided; in addition, the invention further provides a measuring method of the alloy blade, and by means of the method, the qualified rate of finished products can be increased, cost is reduced, and efficiency is improved by collecting data and appointing the product improvement direction and the process route.

According to the PDC drill bit cutting tooth rock breaking test device, a test container serves as a core bearing structure, a pressure control system is communicated with the test container, pressurization, pressure relief and pressure stabilization can be conducted on the interior of the container, confining pressure environments of different depths underground are simulated, the stability and adjustability of pressure conditions in the test process are ensured, and the test efficiency is improved. The bit pressure loading system is fixed in the test container, is connected with a drill bit and can apply force loading and displacement loading to the drill bit at the same time and simulate dynamic mechanical behaviors in the actual drilling process, and the rock sample rotation driving system is fixed in the test container, drives a rock sample to rotate and simulates relative movement when the drill bit cuts rock. The heating system is communicated with the test container, the underground high-temperature environment is simulated through heating, cooling, oil injection and oil discharge of heat conduction oil, the temperature uniformity and stability are ensured, the rock cutting process of the PDC drill bit can be simulated more truly under the high-temperature and high-pressure conditions, and the accuracy of test data is improved.

The utility model provides a coupling confining pressure loading abrasive jet assisted TBM (Tunnel Boring Machine) rock breaking test device, which comprises: an abrasive jet mechanism, the abrasive jet mechanism comprises a pressurizing part, the pressurizing part is connected with a slurry supply part, and the pressurizing part is connected with a jet nozzle; the confining pressure loading mechanism is internally provided with a loading seat, and a rock sample is placed on the loading seat; and the hobbing cutter penetration mechanism is mounted on the confining pressure loading mechanism. By additionally arranging the abrasive jet mechanism, the TBM rock breaking test under the assistance of abrasive jet can be realized; and by arranging the confining pressure loading mechanism, the confining pressure applied to the periphery of the rock sample can be adjusted, and then the influence on the abrasive jet assisted TBM rock breaking test under different confining pressure conditions is studied.

This invention provides a PDC single-tooth rock-breaking experimental device and a method for analyzing the rock-breaking mechanism. The experimental device includes a rock-breaking device body, a PDC tooth cutting depth adjustment mechanism, a cutting speed adjustment mechanism, and a cutting force measurement mechanism. The cutting speed adjustment mechanism can adjust the cutting speed of the rock sample; the rock-breaking device body is used to fix and install the cutting depth adjustment mechanism; the cutting depth adjustment mechanism can clamp the PDC tooth and precisely control its inclination angle and cutting depth; the cutting force measurement mechanism can monitor the cutting force on the rock sample. The method includes the following steps: setting parameters such as cutting depth, cutting speed, and inclination angle; monitoring the cutting force and recording the dynamic rock crushing process; sieving and collecting rock fragments, determining the mass fraction of different groups of rock fragments, and preliminarily determining the ductile-brittle crushing mode of the rock based on the distribution pattern of the rock fragments. This invention has the advantages of precisely controlling the cutting depth, PDC tooth inclination angle, and cutting speed.

The present invention discloses a high-speed orthogonal cutting experimental device and experimental method based on secondary impact technology, comprising a power system, a launching mechanism, a cutting mechanism and a high-speed camera; the launching mechanism and the cutting mechanism are coaxially arranged; the launching mechanism comprises a launching tube, a base and a guide rail fixedly connected in sequence; a guide rod is installed on the guide rail, and a workpiece to be processed is fixed on the guide rod; the cutting mechanism comprises two symmetrically arranged cutting parts, the cutting part comprises a tool clamp, a tool, a force sensor and a slide; the tool is installed on the tool clamp, the tool clamp and the force sensor, and the force sensor is installed on the slide; the power system is used to provide kinetic energy for the guide rod in the launching mechanism, the guide rod and the workpiece to be processed are fixed to drive the workpiece to be processed to move, and the guide rod is installed at the exit position of the launching tube. When cutting, the workpiece only needs to move from the exit of the launching tube to the tool, and does not need to move in the launching tube, thereby avoiding the trajectory uncertainty caused by the movement of the workpiece in the long launching tube.

The invention relates to a rock breaking device for simulating the motion trail of a hobbing cutter, and belongs to the technical field of rock breaking, the rock breaking device comprises a drilling machine frame, and a rotary power unit and a drilling rod assembly which are arranged on the drilling machine frame, and the drilling rod assembly comprises two adjusting supports which are arranged at the ends of output shafts of the rotary power unit respectively; one end of each adjusting support is hinged to an output shaft of the rotary power unit, the two tool bases are arranged at the other ends of the two adjusting supports in a one-to-one correspondence mode, and a plurality of inserted teeth are fixedly arranged at the bottoms of the tool bases. And then the rotary power unit on the drilling machine frame is used for driving the inserted teeth to move to break rocks, so that the rock breaking effects of the whole hobbing cutter of different types under various working conditions are simulated by using a limited number of inserted teeth movement tracks, and compared with a full-size hobbing cutter, the large load does not need to be provided, a plurality of full-size hobbing cutters do not need to be machined, and the machining efficiency is improved. Therefore, the cost of the hob rock breaking test is reduced.

The utility model provides a pneumatic tool for a cutting experiment, which comprises an angle grinder which comprises an angle grinder body, a handle and a transmission mechanism extending out of the bottom of the angle grinder body; the fixing ring is arranged on the outer side of the transmission mechanism in a sleeving manner; the fixing plate is mounted below the fixing ring through the fixing ring; the cam is arranged below the fixed plate and is connected with the transmission mechanism; the cam follower, the blade mounting plate and the blade are sequentially connected with the cam; under the driving of the transmission mechanism, the cam rotates, and then the blade is driven to do reciprocating cutting motion. According to the utility model, the structure of a common pneumatic tool is modified, the interaction effect between a blade and a cut object during manual cutting of an operator is simulated, huge physical output caused by manual cutting is avoided, and even the glue separation work between the inner and outer plates of the vehicle door can be completed by only one operator; and the working efficiency is greatly improved, and the labor cost is reduced.

An apparatus for testing the sharpness of a cutting edge of a blade by cutting a test body includes at least: first support means adapted to support said blade, second support means adapted to support said test body, said first and second support means being arranged and configured so that said test body lies on the cutting edge of said blade, displacing means adapted to carry out a relative sliding between said blade and said test body along said cutting edge with the simultaneous application of a cutting force on the cutting edge of said blade adapted to perform a cut on said test body, first detection means adapted to instantaneously detect a cutting force, and second detection means adapted to instantaneously detect the depth of the cut performed in the test body.

A real-time calibration-based tool condition monitoring system, device and method for repetitive machining operations to monitor tool conditions by a combination of a calibration procedure using a reference tool and similarity analysis comparing the reference tool with a working tool is disclosed.

The invention discloses a rock breaking tunneling detection device based on water jet cutting, and relates to the technical field of on-site rock hardness detection, and the rock breaking tunneling detection device comprises a limiting unit which comprises a vertical fixing assembly, a guide assembly and a horizontal fixing assembly; the drill bit tunneling unit comprises a mounting box, a first air cylinder and a drill bit assembly. The device has the beneficial effects that through efficient cooperative operation of the water jet cutter cutting unit and the drill bit tunneling unit, a water jet cutter is used for cutting the rock surface in advance to form a groove so as to break stress distribution, the water pressure and drill bit parameters are dynamically adjusted by combining a feedback mechanism of the cutting depth and the drilling effect, and the drilling efficiency can be improved under the condition that the drill bit is not replaced on site. The rock hardness data is obtained, then the proper drill bit type is selected, and the problem that the detection efficiency is reduced due to the fact that the drill bits are frequently replaced in field detection is solved.

The application discloses an ultrasonic straight blade sharpness detection device and a detection method thereof. The ultrasonic straight blade sharpness detection device comprises a machine table, a tool clamping tool, a wire clamping device, a force measuring device and a control terminal. The tool clamping tool is arranged on the machine table and is provided with an ultrasonic loading unit for clamping the ultrasonic straight blade to be detected and making the ultrasonic straight blade to be detected vibrate under the action of ultrasonic waves. The wire clamping device is installed on the machine table and below the blade of the ultrasonic straight blade to be detected for fixing the test wire. The force measuring device is arranged at the bottom of the wire clamping device and is used for detecting the cutting force of the cut test wire. The control terminal is signal connected with the force measuring device and is used for determining the sharpness of the ultrasonic straight blade to be detected according to the cutting force. The application provides an ultrasonic straight blade sharpness detection device, realizes the measurement of the sharpness of the cutting blade of the ultrasonic straight blade, improves the accuracy of the test result, and more truly reflects the sharpness of the ultrasonic straight blade.

The method comprises the following steps: a pressing head (42) for pressing a workpiece (W) is assembled on a main shaft (20); pressing the ram (42) into the workpiece (W) by using feeding devices (22, 26, 34) of the machine tool (10); the press-in load (L) and the press-in depth (h) are measured in real time; a press-in load coefficient (C) that is a coefficient when functionally approximating the press-in load (L) by the press-in depth (h) is calculated in real time; when the rate of change of the press-in load coefficient (C) with respect to the press-in depth (h) becomes a value sufficiently close to 0 from a negative value, press-in of the indenter (42) into the workpiece (W) is stopped. And multiplying the press-in depth (h) at the time when press-in is stopped by a depth conversion constant to calculate the depth (Z) of the work-deteriorated layer.

The invention discloses wig shearing detection test equipment, and belongs to the technical field of electric hair cutter detection, the wig shearing detection test equipment comprises a rack, an experimental wig sample and an electric hair cutter, a bottom plate is fixed at the bottom of a working cavity of the rack, an electric push rod is mounted at the top end of the bottom plate, and the output end of the electric push rod faces upwards and is fixedly provided with a supporting plate; a wig fixing assembly is arranged at the top end of the supporting plate, a connecting plate is arranged at the top end of the bottom plate, a clamping assembly is connected to the connecting plate, an adjusting and moving assembly is arranged at the top end of the bottom plate, and a visual inspection assembly is arranged on one side of the supporting plate; the adjusting and moving assembly drives the electric hair cutter to complete linear motion according to a set speed, so that the electric hair cutter performs a cutting test on an experimental wig sample, the visual detection assembly automatically shoots an image after cutting is completed, the percentage of the wig remaining rate is calculated through an image processing algorithm, meanwhile, the camera records an AVI format video in the whole process, and the visual detection assembly detects the wig remaining rate. The whole test is automatically operated, and the method has remarkable technical advancement and market application value.

The present application relates to rock breaking test device technical field, disclose a kind of TBM rock breaking test device, including pedestal, bracing plate one and bracing plate two, the bracing plate one and the bracing plate two are respectively fixedly installed in the pedestal top end two sides;Still include displacement mechanism, the displacement mechanism includes multiple groups of hydraulic rod two fixedly in the bracing plate one inner side, and multiple groups of hydraulic rod two inner side are fixedly connected with bracing plate three, and the bracing plate three is with pedestal upper end horizontal sliding connection;Angle adjusting mechanism, the angle adjusting mechanism includes multiple groups of circumferentially in the bracing plate three inner wall sliding groove mouth.The present application can be under the action of angle adjusting mechanism, realize the angle change of the cutter at top to rock block sample, and under the action of clamping mechanism, sample is damaged, the data generated by simulation damage are summarized, effectively improve the range of equipment simulation, effectively increase the diversity of data, so that data contrast analysis is more accurate.

The invention relates to a method for realizing service life detection of a sharpening machine cutter. The method comprises the following steps: (1) adopting a split type double-edged cutter structure; (2) sequentially adding special powder metallurgy hard alloy into a blade material, passivating a cutting edge of the cutter, adding a CVD (chemical vapor deposition) composite coating on the surface of the cutter and polishing the whole cutter, so as to complete the modification of the cutter; and (3) determining the service life of the cutter of the sharpening machine by adopting a nano-scratch method through measuring the critical loads on different coatings of the cutter and combining the actual use condition of the same working condition. The invention further relates to a corresponding split type double-edged cutter structure. By adopting the method for detecting the service life of the cutter of the sharpening machine and the corresponding cutter structure, the service life of the cutter can be prolonged, and the cutter does not need to be replaced when the sharpening machine is used for fifty thousand times; and meanwhile, the service life of the sharpening machine cutter can be easily judged by using a nano-scratch method, and field testing is not needed.

A blade synchronous blasting cutting device for a cartridge receiver containment test comprises a transmission shaft, blades, a cutting rope, a fixing base, a mounting base, a supporting rod, a blasting propagation assembly, an electric blasting assembly, a signal receiving assembly, a power source and a remote control assembly. The multiple blades are distributed and connected to the shaft wall of the transmission shaft at equal intervals, and the mounting base is connected to the bottom of the transmission shaft and rotates along with the transmission shaft; the number of the supporting rods, the fixing bases, the cutting ropes and the explosion propagation assemblies is equal to the number of blades needing to be cut, one ends of the supporting rods are connected to the side wall of the mounting base, the other ends of the supporting rods extend to the bottoms of the blades, the fixing bases are connected to the surfaces of the blades needing to be cut, and the cutting ropes abut against the positions between the fixing bases and the blades needing to be cut. The electric detonating assembly is arranged in the mounting base, and the signal receiving assembly is arranged on the mounting base. According to the utility model, the plurality of cutting ropes are subjected to synchronous explosion propagation through the explosion propagation assembly, synchronous explosion initiation of the plurality of blades is completed, and test failure caused by unbalance due to successive fracture of the plurality of blades is avoided.

The application discloses a cutting tool test system, which comprises a test table, a spraying system, a dust removal chamber, a measurement and control system and a dust suction system. The test table comprises a mounting plate, a test piece box and a plurality of loading drives. The mounting plate is arranged above the test piece box and is used for assembling the cutting tool. The plurality of loading drives are used for driving the relative movement of the mounting plate and the test piece box. The spraying system comprises a spraying pump and a spraying head. The spraying head is directed to the cutting tool. The dust removal chamber comprises a dust removal guide rail, a moving chamber and a dust removal drive. The dust removal guide rail is arranged on the ground. The moving chamber is slidably assembled on the dust removal guide rail. The dust removal drive is connected with the moving chamber. The measurement and control system comprises a camera and a microscope. The dust suction system comprises a dust suction fan and a cloth bag. The inlet of the dust suction fan is communicated with the dust removal chamber. The test system can simulate the cutting working condition. The dust and noise pollution during the test process is small. The test result is accurate.

The present invention provides a temperature control and maintenance device, a load testing device, and a method for a lunar soil and water ice simulant, belonging to the technical field of sampling and detection of extraterrestrial bodies. The device solves the problem of maintaining the temperature and morphology of existing lunar soil and water ice simulants. The temperature control device includes a low-temperature environment box, a refrigerant mold, and a sample mold. A cutting notch is provided at the top of the low-temperature environment box. A heat-insulating observation opening and closing plate is connected to one side of the low-temperature environment box via a hinge. The heat-insulating observation opening and closing plate is sealed by a latch assembly. The interior of the refrigerant mold is a liquid nitrogen domain. The sample mold is disposed within the refrigeration mold. The refrigerant mold is disposed within the low-temperature environment box. A liquid nitrogen tank pipe interface is provided on one side of the refrigerant mold. A simulated lunar soil sample is provided on the sample mold. A transparent cover is provided on the upper end of the refrigerant mold. A sample cover is provided on the upper end of the simulated lunar soil sample. A sensor interface is provided on the sample mold. The present invention is suitable for maintaining the temperature and morphology of lunar soil and water ice simulants.

The utility model relates to the technical field of blade detection, and discloses a food processor cutting blade detection mechanism, which comprises a test mechanism, the test mechanism comprises a sliding motor, the output end of the sliding motor is fixedly connected with a driving wheel, the outside of the driving wheel is meshed with a driven wheel, the outside of the driven wheel is rotatably connected with a fixed column, and the fixed column is fixedly connected with the sliding motor. A rotating plate is rotationally connected to the outer portion, namely the end away from the driven wheel, of the fixing column, and a limiting block is rotationally connected to the outer portion of the rotating plate. According to the device, the sliding motor is started to drive the driving wheel to rotate, the limiting block plays a limiting role, the sliding connecting plate is driven to move on the test cutter, and the first telescopic pressure rod and the second telescopic pressure rod apply pressure downwards, so that the hardness of the cutter is tested, and whether the cutter leaves scratches on the test surface or not can be observed; and the third telescopic pressure rod is responsible for cleaning the test surface, so that subsequent observation of the limiting design is facilitated, and the test stability and accuracy are guaranteed.

The present application relates to the field of shield machine testing equipment, specifically is a kind of shield machine component performance testing equipment, including the base frame of L-shaped structure, the horizontal section of base frame is slidably connected with support plate left and right, its vertical section is rotatably connected with U-shaped frame, U-shaped frame and support plate are provided with pseudo mechanism for impacting and wearing test of cutter on it, limiting mechanism for limiting cutter is arranged on U-shaped frame, the rotating cylinder of the present application is intermittently driven by driving assembly, drives the impact ball at the end of swing rod to rise to set height, by the way of accumulating gravitational potential energy and converting into kinetic energy, impact ball violently impacts cutter surface in the form of free swing, this process highly simulates the instantaneous, high-energy impact working condition of falling stone on cutter blade circle in tunneling, effectively reveals the real damage mode of micro-crack, collapse or structural failure caused by impact load to cutter, significantly improves the pseudo of impact test.

To analyze the internal state of a sample with high accuracy.SOLUTION: A load acting upon a cutting-edge in a direction X is measured while cutting a sample in the direction X in a first X-direction cutting step following a first Z-direction cutting step. The load acting upon the cutting-edge in the direction X is measured while cutting the sample in the direction X in a second X-direction cutting step following a second Z-direction cutting step. The first round of the second Z-direction cutting step involves cutting the sample to a position downward in the direction Z from the cutting position in the first X-direction cutting step. The second and subsequent rounds of the second Z-direction cutting step involves cutting the sample to a position downward in the direction Z from the cutting position of the second X-direction cutting step carried out immediately before. The internal state of the sample is analyzed on the basis of the load in the direction X measured in the first and second X-direction cutting steps.SELECTED DRAWING: Figure 4