CN108982268A - A kind of high-temperature hardness gauge that can carry out continuous alternating temperature multi-point sampler - Google Patents
A kind of high-temperature hardness gauge that can carry out continuous alternating temperature multi-point sampler Download PDFInfo
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- CN108982268A CN108982268A CN201811038002.4A CN201811038002A CN108982268A CN 108982268 A CN108982268 A CN 108982268A CN 201811038002 A CN201811038002 A CN 201811038002A CN 108982268 A CN108982268 A CN 108982268A
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- heating furnace
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- furnace
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- pivoting support
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/40—Investigating hardness or rebound hardness
- G01N3/54—Performing tests at high or low temperatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0076—Hardness, compressibility or resistance to crushing
- G01N2203/0078—Hardness, compressibility or resistance to crushing using indentation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0226—High temperature; Heating means
Abstract
A kind of high-temperature hardness gauge that can carry out continuous alternating temperature multi-point sampler, belongs to metal material mechanics detection device technical field, for carrying out Multi-point high temperature hardness determination to metal material.Its technical solution is: penetrator is connected with hardometer ontology, heating furnace is mounted on heating furnace rotating mechanism, heating furnace rotating mechanism is fixed on heating furnace hoistable platform, heating furnace hoistable platform is fixed on hardometer bottom bracing structure, the side of hardometer bottom bracing structure is connected with hardometer ontology, penetrator is perpendicularly inserted into heating furnace, sample mobile mechanism is connected to the side of heating furnace, heating furnace and heating furnace rotating mechanism are coaxial cylindrical body, the axis of the central axis and penetrator of heating furnace and heating furnace rotating mechanism has eccentricity.The present invention realizes the random reconnaissance of progress whole face under the premise of not blow-on adjusts sample of furnace formula high-temperature hardness gauge and carries out continuous, alternating temperature hardness test, greatly improves the hardness number measurement quantity of same sample.
Description
Technical field
The present invention relates to the hardometers that a kind of pair of metal material carries out high temperature hardness detection, belong to metal material mechanics detection
Equipment technical field.
Background technique
Hardness test is to evaluate the important detection project of material mechanical performance index.General hardness test is in room temperature
It is carried out under environment.As firmness level of the needs assessment material under different temperatures environment, needed for usually heating the material to
Temperature heat preservation a period of time, is quickly cooled down, then carries out hardness number test under room temperature environment.Such test method, not
It is able to achieve the on-line testing to material at high temperature hardness number, test result not can accurately reflect the reality under the conditions of specific test temperature
Border firmness level.The high temperature hardness index for measuring material is the use longevity of the materials such as appraisal tool steel, abrasion-resistant stee, high temperature alloy
Life, and most direct, the most effective characterization of detection various types other materials mechanical property changing rule in varying temperature environment
Means.But high temperature hardness counter device used at present, the hard of finite number of time can only be realized under some specific temperature environment
Angle value test, cannot achieve the multiple spot hardness number follow-on test in large temperature range.In the hardness number for different temperatures
When test, generally requires to heat various sample repeatedly, test, entire test process is complex and time-consuming.Cause this
The key reason of problem is that the high-temperature hardness gauge being currently known is all made of heating furnace center line and kisses completely with hardometer center line
The centering mechanical structure of conjunction, test sample can only unidirectionally be moved in heating furnace burner hearth.Since size of burner hearth is limited, sample
Movable distance is limited, and resulting in the same sample can only carry out being extremely limited time hardness number measurement.
Summary of the invention
Technical problem to be solved by the invention is to provide the high temperature hardness that one kind can carry out continuous alternating temperature multi-point sampler
Meter, this high-temperature hardness gauge can make sample be rotated and be moved in two-dimensional surface, be obviously improved same sample to reach
The purpose for testing hardness number quantity.
The technical solution for solving above-mentioned technical problem is:
A kind of high-temperature hardness gauge that can carry out continuous alternating temperature multi-point sampler, it includes hardometer ontology, penetrator, heating
Furnace, sample mobile mechanism, heating furnace rotating mechanism, heating furnace hoistable platform, hardometer bottom bracing structure, furnace atmosphere are protected
Protection unit and heating furnace induction heating control device, penetrator are connected with hardometer ontology, penetrator lower end with
Heating furnace is opposite, and heating furnace is mounted on heating furnace rotating mechanism, and heating furnace rotating mechanism is fixed on heating furnace hoistable platform,
Heating furnace hoistable platform is fixed on hardometer bottom bracing structure, the side of hardometer bottom bracing structure and hardometer ontology
It is connected, penetrator is perpendicularly inserted into heating furnace, and sample mobile mechanism is connected to the side of heating furnace, furnace atmosphere
Protective device and heating furnace induction heating control device are located at hardometer outer body, and furnace atmosphere protective device passes through pipeline
It is connected with heating furnace, heating furnace induction heating control device is connected with heating furnace, and heating furnace and heating furnace rotating mechanism are
The axis of coaxial cylindrical body, the central axis and penetrator of heating furnace and heating furnace rotating mechanism has eccentricity.
The above-mentioned high-temperature hardness gauge that can carry out continuous alternating temperature multi-point sampler, heating furnace are cylindrical shape, heating furnace by
Bell and furnace body composition, bell include bell shell, bell thermal insulation material, pressure head insertion plug, and furnace body includes furnace body shell, furnace body
Thermal insulation material, bell thermal insulation material are inlaid in bell shell, and there is pressure head insertion plug at the center of bell, and pressure head insertion has partially beyond the Great Wall
The pressure head of the heart is inserted into hole, and the central axis that pressure head is inserted into hole is opposite with the axis coaxle of penetrator, and penetrator passes through
The pressure head insertion hole of pressure head insertion beyond the Great Wall enters in the burner hearth of heating furnace body.
The above-mentioned high-temperature hardness gauge that can carry out continuous alternating temperature multi-point sampler, the sample mobile mechanism include that sample pushes away
Bar, bracket, bearing block, bearing, push rod knob, pedestal lower end and furnace body outside vertical are welded to connect, and frame upper has bearing block,
Bearing is mounted in bearing block, and push rod knob is tube-in-tube structure, and the periphery of push rod knob and the inner ring of bearing are that interference fit connects
It connects, the inner hole of push rod knob has screw thread, and sample push rod is inserted in push rod knob, and the rear portion of sample push rod and push rod knob are screw thread
It connects, there is sample push rod to be inserted into hole on heating-furnace body sidewall, sample push rod is inserted into hole by sample push rod and is inserted into heating furnace
In burner hearth, the front end of sample push rod is in contact with the sample in heating furnace burner hearth, has size quarter on the body of rod at sample push rod rear portion
Degree.
The above-mentioned high-temperature hardness gauge that can carry out continuous alternating temperature multi-point sampler, the heating furnace rotating mechanism is by pivoting support
Seat, pivoting support turntable, rolling bearing circle composition, pivoting support seat are oblate cylinder, and pivoting support seat and heating furnace lifting are flat
The upper end of platform is fixedly connected, and pivoting support turntable is annulus, annulus diameter of bore and the pivoting support seat of pivoting support turntable
Outer peripheral diameter matches, and pivoting support turntable annulus is covered in pivoting support seat periphery, and rolling bearing circle is mounted on pivoting support and turns
Between disk annulus and pivoting support seat periphery, the top surface of pivoting support turntable and the bottom surface of heating furnace are bolted connection.
The beneficial effects of the present invention are:
Heating furnace rotating mechanism of the invention can drive heating furnace to carry out eccentric rotary around penetrator, be connected to heating
Sample mobile mechanism on furnace can push sample to be moved forward and backward, and heating furnace is eccentrically rotated the synthesis being moved forward and backward with sample can be with
So that specimen surface and penetrator in heating furnace is formed any number of hardness test points, carries out multiple spot hardness test；Heating furnace
The height of the adjustable heating furnace of hoistable platform adapts to the hardness test of different-thickness sample；Furnace atmosphere protective device and
Heating furnace induction heating control device can correspondingly change the external conditions such as temperature atmosphere, atmosphere protection atmosphere.
The present invention is the pioneering of metal hardness test equipment, have the characteristics that structure be simple and convenient to operate, efficient work,
It is continuous, alternating temperature hard to realize the random reconnaissance progress of furnace formula high-temperature hardness gauge progress whole face under the premise of not blow-on adjusts sample
Spend test target, and greatly improve the hardness number measurement quantity that same sample can be carried out, at the same there are also atmosphere protection,
Automatic furnace temperature adjusts the functions such as control, and can add the additional structures such as vacuum atmosphere, electric automatic control, in metal hardness
There is good popularizing value in detection device technical field.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of invention；
Fig. 2 is the side view of Fig. 1；
Fig. 3 is the structural schematic diagram of heating furnace and heating furnace rotating mechanism；
Fig. 4 is the top view of sample testing point consecutive variations；
Fig. 5 is the sample testing point schematic diagram of Fig. 4；
Fig. 6 is the possible test point area schematic of sample of Fig. 4.
It is marked in figure as follows: hardometer ontology 1, penetrator 2, heating furnace 3, sample mobile mechanism 4, heating furnace rotation
Mechanism 5, heating furnace hoistable platform 6, hardometer bottom bracing structure 7, furnace atmosphere protective device 8, heating furnace induction heating
Control device 9, bell shell 10, pressure head insertion plug 11, pressure head insertion hole 12, furnace body shell 13, sample push rod insertion hole 14, examination
Sample 15, sample push rod 16, bracket 17, bearing block 18, bearing 19, push rod knob 20, pivoting support seat 21, pivoting support turntable
22, rolling bearing circle 23, bell wear resistant heat preserving material 24, the resistance to material 25 of bell nanometer, furnace body nanometer be resistance to 26, the resistance to material of built-in electrical insulation
27, the resistance to material 28 of furnace body outer low temperature, the resistance to material 29 of furnace interior high temperature, the resistance to material 30 of upper of furnace body, the resistance to material 31 in bell lower part, junction
Wear resistant heat preserving material 32.
Specific embodiment
The present invention is by hardometer ontology 1, penetrator 2, heating furnace 3, sample mobile mechanism 4, heating furnace rotating mechanism
5, heating furnace hoistable platform 6, hardometer bottom bracing structure 7, furnace atmosphere protective device 8, the control of heating furnace induction heating
Device 9 forms.
Fig. 1,2 displays, penetrator 2 are connected with hardometer ontology 1,2 lower end of penetrator and 3 phase of heating furnace
Right, penetrator 2 is inserted perpendicularly into heating furnace 3, carries out hardness test to the sample 15 being placed in heating furnace 3.
Fig. 1,2,3 show that heating furnace 3 is mounted on heating furnace rotating mechanism 5, and heating furnace rotating mechanism 5 is fixed on heating
On furnace hoistable platform 6, heating furnace hoistable platform 6 is fixed on hardometer bottom bracing structure 7, hardometer bottom bracing structure 7
Side be connected with hardometer ontology 1.Heating furnace 3 and heating furnace rotating mechanism 5 are coaxial cylindrical body, heating furnace 3 and plus
The central axis of hot stove rotating mechanism 5 and the axis of penetrator 2 have eccentricity.Heating furnace rotating mechanism 5 drives heating furnace 3
When rotating coaxially, for the sample 15 being placed in heating furnace 3 as heating furnace 3 rotates, rotary motion trace is around penetrator 2
Circular arc, circular arc are equal to eccentricity at a distance from penetrator 2.
Fig. 1,2,3 show that sample mobile mechanism 4 is connected to the side of heating furnace 3, carry out to the sample 15 in heating furnace 3
It is moved forward and backward.Furnace atmosphere protective device 8 and heating furnace induction heating control device 9 are located at 1 outside of hardometer ontology.Heating
Furnace atmosphere protective device 8 is connected by pipeline with heating furnace 3, carries out atmosphere protection to heating furnace 3, and can add vacuum
Atmosphere.Heating furnace induction heating control device 9 is connected with heating furnace 3, has the function of that automatic furnace temperature adjusts control etc..
Fig. 2,3 displays, heating furnace 3 is cylindrical shape, and heating furnace 3 is made of bell and furnace body.Bell includes outside bell
Shell 10, bell thermal insulation material, pressure head insertion plug 11, furnace body includes furnace body shell 13, furnace insulation, and bell thermal insulation material is embedding
In bell shell 13.Pressure head insertion plug 11 is located at the center of bell, there is eccentric pressure head insertion hole on pressure head insertion plug 11
12, the central axis that pressure head is inserted into hole 12 is opposite with the axis coaxle of penetrator 2, and penetrator 2 is inserted into across pressure head
Pressure head insertion hole 12 on plug 11 enters in the burner hearth of 3 furnace body of heating furnace.
Fig. 3 shows, the thermal insulation material of bell and furnace body have respectively the resistance to material 25 of bell wear resistant heat preserving material 24, bell nanometer,
Furnace body nanometer is resistance to 26, the resistance to material 27 of built-in electrical insulation, the resistance to material 28 of furnace body outer low temperature, the resistance to material 29 of furnace interior high temperature, upper of furnace body are resistance to
Material 30, the resistance to material 31 in bell lower part, junction wear resistant heat preserving material 32.They play insulation effect to bell and furnace body.
Fig. 2,3 displays, sample mobile mechanism 4 include sample push rod 16, bracket 17, bearing block 18, bearing 19, push rod knob
20.17 lower end of bracket and furnace body outside vertical are welded to connect, and bearing block 18 is arranged at 17 top of bracket, and bearing 19 is mounted on bearing block 18
In.Push rod knob 20 is tube-in-tube structure, and the periphery of push rod knob 20 and the inner ring of bearing 19 are interference fit connection, push rod knob
20 inner hole has screw thread, and sample push rod 16 is inserted in push rod knob 20, and the rear portion of sample push rod 16 and push rod knob 20 are screw thread
Connection.There is sample push rod to be inserted into hole 14 on heating-furnace body sidewall, sample push rod 16 is inserted into hole 14 by sample push rod and is inserted into
In heating furnace burner hearth, the front end of sample push rod 16 is in contact with the sample 15 in heating furnace burner hearth, the bar at 16 rear portion of sample push rod
There is size scale on body.Rotating push-rod knob 20, sample push rod 16 forward and backward will be moved along the screw hole of push rod knob 20.Examination
The front end of sample push rod 16 can push sample 15 mobile, and mobile distance can be in terms of the size scale on 16 body of rod of sample push rod
Out.
Sample push rod is inserted into hole 14, sample 15, sample push rod 16, bracket 17, bearing 19, push rod knob 20, pivoting support
Seat 21, pivoting support turntable 22, rolling bearing circle 23,
Fig. 3 shows that heating furnace rotating mechanism 5 is made of pivoting support seat 21, pivoting support turntable 22, rolling bearing circle 23.It returns
Turning fulcrum bearing 21 is oblate cylinder, and pivoting support seat 21 is fixedly connected with the upper end of heating furnace hoistable platform 6.Pivoting support turntable
22 be annulus, and the annulus diameter of bore and the outer peripheral diameter of pivoting support seat 21 of pivoting support turntable 22 match, pivoting support
22 annulus of turntable is covered in 21 periphery of pivoting support seat, and rolling bearing circle 23 is mounted on 22 annulus of pivoting support turntable and pivoting support
Between 21 peripheries of seat, the top surface of pivoting support turntable 22 is bolted with the bottom surface of heating furnace 3 to be connect.
Fig. 3 shows that heating furnace hoistable platform 6 is the general nut screw elevating mechanism of hardometer, can revolve to heating furnace
Rotation mechanism 5 is gone up and down.
Fig. 4 shows, in actual operation, the test point position of penetrator 2 be it is constant, operator is by sample 15
And sample push rod 16 places, adjustment heating furnace induction heating control structure 9, furnace atmosphere protect equipment 8, make heating-furnace
Furnace temperature needed for reaching content of the test in the furnace chamber of body 3 and experimental atmosphere, and keep reaching experimental condition to sample 15.Adjustment adds
Hot stove hoistable platform 6, the hardometer for directly carrying out first testing site get test ready；Then, according to the examination of second testing site
Requirement is tested, by rotary heating furnace rotating mechanism 5 and adjustment sample mobile mechanism 4, makes sample 15 in the synthesis for rotating and translating
Effect is lower to reach test position, and second test point and penetrator 2 of sample 15 are opposite, adjust heating furnace induction heating
Control structure 9, furnace atmosphere protect equipment 8, make furnace temperature needed for reaching second test point in the furnace chamber of heating furnace body 3
And experimental atmosphere, the hardometer for carrying out second testing site get test ready；Successively down, four different examinations have been carried out in Fig. 4 altogether
The hardness tested a little gets test ready.According to aforesaid operations, the present invention realizes sample 15 in the moving in rotation of horizontal plane, significantly mentions
The measurable amount of high rigidity point.
Fig. 5 shows that four hardometers of Fig. 4 get the distributing position tested on sample 15 ready, and A, B, C, D are respectively to test
Point.
Fig. 6 shows, then can on entire sample 15 if setting the angle rotating range of heating furnace rotating mechanism 5 as 180 °
Using the face regional scope got ready as shown in fig. 6, E is dotted areas, L is shift motion, and R is eccentricity d.
Embodiment 1
The alternating temperature hardometer that the present embodiment is arranged using eccentric furnace formula, while using heating furnace induction heating control structure, adding
Hot stove atmosphere protection equipment is adjusted the experimental atmosphere and temperature of sample.The sample often carried out gets pitch requirements ready
2mm, so the eccentricity d1 of this example heating furnace and hardometer center line uses 10mm, effective shift motion L of sample is
15mm.By device authentication, 105 hardness number measurement tests can be carried out with one piece of sample in this example.If according to each
Experimental condition carries out the requirement of experiment that 10 times are tested to be averaged to calculate, and 10 examinations of variation can be adjusted in the case where not blow-on
The experimental condition of sample such as converts 10 specimen temperatures.
Embodiment 2
The alternating temperature hardometer that the present embodiment is arranged using eccentric furnace formula, using heating furnace induction heating control structure to sample
Experimental temperature is adjusted, and is used heating furnace vacuum equipment and carried out protection against oxidation to sample.The sample often carried out
Getting pitch requirements ready is 3mm, and the eccentricity d1 of heating furnace and hardometer center line in the present embodiment uses 18mm, sample
Effective shift motion L is 30mm.It is verified by equipment test, 180 hardness can be carried out with same sample in this implementation
Value measurement test.If carrying out the requirement of experiment that 10 times are tested to be averaged according to each experimental condition to calculate, can not open
18 specimen temperatures of adjustment variation, carry out alternating temperature hardness test in the case where furnace.
Claims (4)
1. the high-temperature hardness gauge that one kind can carry out continuous alternating temperature multi-point sampler, it is characterised in that: it includes hardometer ontology
(1), penetrator (2), heating furnace (3), sample mobile mechanism (4), heating furnace rotating mechanism (5), heating furnace hoistable platform
(6), hardometer bottom bracing structure (7), furnace atmosphere protective device (8) and heating furnace induction heating control device (9), firmly
Degree meter pressure head (2) is connected with hardometer ontology (1), and relatively, heating furnace (3) is pacified for penetrator (2) lower end and heating furnace (3)
On heating furnace rotating mechanism (5), heating furnace rotating mechanism (5) is fixed on heating furnace hoistable platform (6), heating furnace lifting
Platform (6) is fixed on hardometer bottom bracing structure (7), the side of hardometer bottom bracing structure (7) and hardometer ontology
(1) it is connected, penetrator (2) is perpendicularly inserted into heating furnace (3), and sample mobile mechanism (4) is connected to heating furnace (3)
Side, furnace atmosphere protective device (8) and heating furnace induction heating control device (9) are located on the outside of hardometer ontology (1), add
Hot stove atmosphere protection device (8) is connected by pipeline with heating furnace (3), heating furnace induction heating control device (9) and heating
Furnace (3) is connected, and heating furnace (3) and heating furnace rotating mechanism (5) are coaxial cylindrical body, heating furnace (3) and heating furnace rotation
The central axis of mechanism (5) and the axis of penetrator (2) have eccentricity.
2. the high-temperature hardness gauge according to claim 1 that continuous alternating temperature multi-point sampler can be carried out, it is characterised in that: heating
Furnace (3) is cylindrical shape, and heating furnace (3) is made of bell and furnace body, and bell includes bell shell (10), bell thermal insulating material
Material, pressure head insertion plug (11), furnace body includes furnace body shell (13), furnace insulation, and bell thermal insulation material is inlaid in outside bell
In shell (13), there is pressure head insertion plug (11) at the center of bell, there is eccentric pressure head insertion hole (12), pressure on pressure head insertion plug (11)
The central axis of head insertion hole (12) is opposite with the axis coaxle of penetrator (2), and penetrator (2) is inserted into across pressure head
Pressure head insertion hole (12) filled on (11) enters in the burner hearth of heating furnace (3) furnace body.
3. the high-temperature hardness gauge according to claim 1 that continuous alternating temperature multi-point sampler can be carried out, it is characterised in that: described
Sample mobile mechanism (4) includes sample push rod (16), bracket (17), bearing block (18), bearing (19), push rod knob (20), branch
Frame (17) lower end and furnace body outside vertical are welded to connect, and bracket (17) top has bearing block (18), and bearing (19) is mounted on bearing
In seat (18), push rod knob (20) is tube-in-tube structure, and the periphery of push rod knob (20) and the inner ring of bearing (19) are interference fit
Connection, the inner hole of push rod knob (20) have screw thread, and sample push rod (16) is inserted in push rod knob (20), after sample push rod (16)
Portion is to be threadedly coupled with push rod knob (20), has sample push rod to be inserted into hole (14) on heating furnace (3) sidewall of the furnace body, sample push rod
(16) it is inserted into heating furnace (3) burner hearth by sample push rod insertion hole (14), the front end and heating furnace (3) of sample push rod (16)
Sample (15) in burner hearth is in contact, and has size scale on the body of rod at sample push rod (16) rear portion.
4. the high-temperature hardness gauge according to claim 1 that continuous alternating temperature multi-point sampler can be carried out, it is characterised in that: described
Heating furnace rotating mechanism (5) is made of pivoting support seat (21), pivoting support turntable (22), rolling bearing circle (23), revolution branch
Holding seat (21) is oblate cylinder, and pivoting support seat (21) is fixedly connected with the upper end of heating furnace hoistable platform (6), and pivoting support turns
Disk (22) is annulus, and the annulus diameter of bore and the outer peripheral diameter of pivoting support seat (21) of pivoting support turntable (22) match,
Pivoting support turntable (22) annulus is covered in pivoting support seat (21) periphery, and rolling bearing circle (23) is mounted on pivoting support turntable
(22) between annulus and pivoting support seat (21) periphery, the bottom surfaces of the top surface of pivoting support turntable (22) and heating furnace (3) by
Bolt is fixedly connected.
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| CN201811038002.4A CN108982268A (en) | 2018-09-06 | 2018-09-06 | A kind of high-temperature hardness gauge that can carry out continuous alternating temperature multi-point sampler |
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| CN201811038002.4A CN108982268A (en) | 2018-09-06 | 2018-09-06 | A kind of high-temperature hardness gauge that can carry out continuous alternating temperature multi-point sampler |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110231238A (en) * | 2019-05-30 | 2019-09-13 | 吉林省维尔特隧道装备有限公司 | The gradient rigidity detection device and method in development machine hobboing cutter cutter ring section |
| CN110487657A (en) * | 2019-09-24 | 2019-11-22 | 中国航空工业集团公司北京长城计量测试技术研究所 | A kind of automatic sampling, calibration system and the method for Rockwell hardness block calibrating installation |
| CN113075022A (en) * | 2021-03-22 | 2021-07-06 | 山东宗德机电设备有限公司 | High-temperature hardness tester for continuous high-temperature hardness test |
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