JP3722313B2 - Measuring head for penetration depth type hardness measuring device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a measuring head which need use the hardness measuring apparatus for measuring the hardness of the sample crowded press indenter in the sample, in particular, to allow for automatic measurement of the hardness penetration depth type hardness The present invention relates to an improvement of a measuring head for a measuring device.
[0002]
[Prior art]
Conventionally, as a hardness tester which need use the automatic measurement of hardness, for example, those as described in JP-A-7-128208 it has been proposed.
To explain this by 8, reference numeral 60 in FIG. 8 shows the measuring head, the measuring head 60, are I Do from the test load unit A and an initial load unit B. Then, the measuring head 60 is formed on the whole cylindrical shape.
[0003]
Reference numeral 5 denotes a pressing cylinder as an outer frame member of the initial load unit B, and a test load case 3 as an outer frame member of the test load unit A is connected to the upper portion of the pressing cylinder 5 by screw connection. It has come to be. The pressing cylinder 5 and the test load case 3 are formed to have the same outer diameter, and both are integrated by screw connection.
[0004]
The pressing cylinder 5, the insulating piece 11 via an electrically insulated Rutotomoni conical receiving surface 10a guide is formed collector made of seat 10 is provided. Inside the pressing cylinder 5, the intermediate tube 7 is disposed vertically movably. The middle tube 7, by contacting the conical receiving surface 10a of the seat 10 in the conical shape of the abutment surface formed on the lower end, so that the downward movement of is restricted .
Reference numeral 9 denotes a support ring of the seat 10.
[0005]
Middle tube 7 is adapted to move up and down the inside of the pressing cylinder 5 is guided by the sliding piece 4 which is attach thereon. Further, the lower end of the intermediate tube 7, Rutotomoni are attach a connection tube 12, that has cylindrical reference piece 27 is Ri attached taken through the connecting tube 12. The reference piece 27 is disposed so as to face the mounting surface of the sample 14 on the sample stage c, by the lowering of the intermediate tube 7, the lower end surface of the reference piece 27 to the surface of the sample 14 It comes to contact. The intermediate cylinder 7 has an upper end supported by the pressing cylinder 5 and a lower end of a pressing spring 24 capable of applying a pressing force fc to the intermediate cylinder 7 .
[0006]
Inside of the intermediate tube 7, as along its vertical center axis, the indenter shaft 8 is disposed.
The lower portion of the indenter shaft 8, can abut spring accept 26 is Ri attached preparative conically receiving portion 27a of the reference piece 27. Further, the lower end of the indenter shaft 8, the indenter 13 is Ri attached taken. The indenter shaft 8 has an upper end supported by the intermediate cylinder 7 and a lower end of an initial load spring 25 capable of applying an initial load f ₁ to the indenter 13.
In addition, a lower end portion of an intermediate shaft 21 disposed along the vertical center axis of the intermediate cylinder 7 is screwed to the upper end portion of the indenter shaft 8.
[0007]
The intermediate shaft 21 is fitted movably in mind opening in the sliding piece 4. Therefore, the indenter shaft 8 is integrated with the intermediate shaft 21 and can move in the vertical direction in the intermediate cylinder 7.
Reference numeral 20 denotes a load receiving surface which is attach to the top surface of the intermediate shaft 21.
Further, a long hole 21a is formed in the intermediate portion of the intermediate shaft 21 in the axial direction, and a support fitting 6 protruding from the intermediate cylinder 7 is disposed in the long hole 21a . Then, the support fitting 6, the coil 22 constituting the differential transformer as a displacement sensor are Ri attached taken.
[0008]
On the other hand, the indenter shaft 8 is the core shaft 23 is protruded, the upper end portion of the core shaft 23 is extended into the coil 22, the together with the coil 22, relative to the reference piece 27 and the indenter 13 A differential transformer is configured as a displacement meter for measuring the displacement.
As the displacement sensor, a linear scale or the like may be used instead of the differential transformer.
Thus, the initial load unit B is configured.
[0009]
On the other hand, the test load case 3, the lower end so as to face the load receiving surface 20 of the upper end surface of the intermediate shaft 21, load shaft 16 is disposed. The load shaft 16 has its upper portion, more springs accepted 1 screwed into the test load case 3, that is slidably guided in the vertical direction. Further, the lower part is supported on the seat 18 via a spring receiver only 17 which is attach to the loading axis 16. The receiving seat 18 has a conical receiving portion 18 a and is supported on the test load case 3 via an insulating piece 19 .
Furthermore, between the spring receiver only 17 and the spring accept 1, test load spring 2 that obtained by imparting test load to the indenter shaft 8 through the loading axis 16 is interposed.
In this way, the test load unit A is configured.
[0010]
The seat 10 and seat 18, since it is electrically insulated from both the support member, they seat 10, 18 and the intermediate tube 7 or the respective initial load detected by the spring accepted 17 use switch S _1, the test load detecting switch S ₂ is constituted, also, the load state detection mechanism is configured that could be detected initial load load condition and test load application state respectively by the switch S ₁ and S ₂ . The on / off state of the switches S ₁ and S ₂ is displayed on the pilot lamp of the display.
[0011]
The measuring head 60 of the above construction, when the hardness measurement, is mounted on the machine frame 120, as shown in FIG. 7, Ru pushed down through the lever 101 by a hydraulic cylinder 102.
The length of the indenter shaft 8 is such that the indenter 13 protrudes slightly (indicated by the dimension a) from the lower end of the reference piece 27 when the indenter shaft 8 is in contact with the conical receiving surface 27a when there is no load. Is set . Further, in a state of its is, between the load receiving surface 20 and the lower end surface of the load axis 16, the protrusion amount a larger gap b of the indenter 13 is in so that maintained.
[0012]
When the measurement head 60 is lowered to press, first indenter 13 comes into contact with the sample 14, the conical receiving portion 27a of the reference piece 27 from the spring accepted 26 of the indenter shaft 8 is released into relatively downward. Therefore, the initial load f ₁ by the initial load spring 25 is applied to the indenter 13 .
When the measurement head 60 is further pressed and lowered in contact with the reference piece 27 is the sample 14, further measuring head 60 is lowered by pressing the switch S ₁ the lower end of the middle tube 7 is away from the seat 10 It becomes OFF.
[0013]
Then, press with only the power of the reference piece 27 fc is also a state where the initial load f ₁ applied to the indenter 13.
Incidentally, at this time, is maintained the distance between the load receiving surface 20 and the lower end surface of the loading axis 16. The electromotive force corresponding to the protrusion amount H ₁ of the indenter 13 with respect to the reference piece 27 when the initial load state is generated in the coil 22 of the differential transformer, is stored in a computer in which the value is incorporated in the display device.
[0014]
When the measurement unit 60 is further pressed and lowered in contact with the lower end surface load receiving surface 20 of the loading axis 16, the spring receiver only 17 of the load axis 16 is separated from the conical receiving surface 18a of the seat 18. When a test load f ₂ that by the test load spring 2 is added to the indenter 13. Note that the departure from the receiving surface 18a of the spring receiver only 17, switch S ₂ is turned OFF, it is now the state is displayed to the pilot lamp.
[0015]
Then, the state (the indenter 13 "f _{1 (initial} load) + f 2 _(Test load)" state is loaded, test load state) after becoming may varying the measuring head 60 in the upward movement. In the ascending process of the measuring head 60, the initial load is again reached . Therefore, the projecting amount of H ₂ from the reference piece 27 of the indenter 13 when it is measured, the difference H _{0 =} H ₂ -H ₁ and H ₁ of H ₂ and above Ru is calculated by the computer in the display . Furthermore, this is (H _0), is converted to the hardness based on the formula which are input in advance, it is displayed as a hardness in the measured value display panel.
[0016]
[Problems to be solved by the invention]
Thus, in the conventional hardness meter as described above, the indenter 13 with pressed against the surface of the sample 14 at an initial load f ₁ (this state is referred to as "initial load state"), the reference piece 27 in the pressing load fc Press against the surface of the sample 14. Then, the H ₁ (penetration depth into the sample) the displacement of the reference piece 27 indenter 13 on the basis of this time is measured by the displacement sensor. Next , a test load f ₂ is added to the indenter 13 (this state is referred to as “test load state”, and the load “f ₁ + f ₂ ” is applied to the indenter 13), and then the test load f ₂ is removed. return to initial load state, measuring the reference piece 27 reference to displacement of the indenter (the penetration depth into the sample) H ₂ at that time by the displacement sensor. Then , H ₀ = H ₂ −H ₁ is calculated by a computer, and the hardness of the sample is measured from the pre-calculated (including experiment) relationship between H ₀ and hardness K.
[0017]
By the way, in the conventional hardness tester as described above, the measuring head 60 is configured as a combined body of the test load unit A and the initial load unit B that are separately assembled, so that the measuring head 60 can be easily assembled. However, the indenter shaft 8 must be configured so as not to extend upward from the test load unit A. As a result, the length of main parts such as the indenter shaft 8 and the intermediate cylinder 7 can be reduced. is shortened, deteriorates the stability of posture, in the hardness test, it is difficult to always match the axial center to the load direction of the load of the indenter shaft 8, there is a problem that a measurement error is liable to occur.
[0018]
It is an object of the present invention to provide a measurement head for a penetration depth type hardness measurement apparatus that solves such problems.
[0019]
[Means for Solving the Problems]
In order to achieve this object, the present invention provides a measuring head in a penetration depth type hardness measuring apparatus, comprising a casing forming an outer shell portion of the measuring head and a guide shaft provided at an upper end portion of the casing. with the upper end portion is slidably supported in the vertical direction, the lower end portion is not have a length which extends below the lower end of the casing, an intermediate barrel reference piece is attached at its lower end, and indenter shaft indenter is attached to the lower end, e Bei, the indenter shaft, with its upper end is slidably supported in the vertical direction in the vicinity of the upper end portion of the intermediate tube, its lower end the the lower end of the intermediate cylinder so as to extend downward, are arranged inside of the intermediate cylinder, in the casing at a position below the upper end surface of the indenter shaft, and the casing Test load interposed between A spring receiver for applying a test load to the indenter shaft is provided so as to be slidable in the vertical direction, and a cylindrical support member protruding upward is integrally provided on the spring receiver. The upper and lower ends of the intermediate cylinder and the indenter shaft are located inside the support member .
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a measurement head for a penetration depth type hardness measurement apparatus as an embodiment of the present invention will be described with reference to the drawings . In the figure, 1 is a front sectional view of the measuring head, FIG 2 is a side sectional view of Lee Yabe of Figure 1, FIG. 3 (a) is an exploded perspective view of Lee Yabe 1, (b) is shown in FIG. 2 4 is an enlarged front sectional view near the lower end of the indenter shaft, FIG. 5A is a front sectional view of the sample sensor, FIG. 4B is a bottom view, and FIG. Is a front sectional view of the reference piece, FIG. 7B is a bottom view thereof, and FIG. 7 is a schematic front view of the whole measuring apparatus.
1-7, the same code | symbol as FIG. 8 has shown the substantially same member.
[0021]
As shown in FIG. 1, in this embodiment, the outer shell of the measuring head 100 includes a cylindrical upper casing 103, to which is formed by the lower casing 105 coupled together. At the center of the lower casing 105, the indenter shaft 8 is disposed.
As will be described later, the indenter shaft 8 has a length that is coupled to other components and extends almost the entire length of the measuring head 100 as a whole.
[0022]
The lower casing 105, seat 10 is provided with electrically insulated Rutotomoni conical receiving surface through an insulating piece 11 is formed. Inside the lower casing 105, the intermediate tube 7 is disposed vertically movably. Then , a spring receiver 7a of the pressing spring 24 is placed on the lower flange portion 7c, and comes into contact with the conical receiving surface of the receiving seat 10 at the conical surface abutting surface 7b formed on the peripheral edge of the spring receiver 7a. Therefore, the downward movement is restricted.
Reference numeral 105a denotes a mounting ring of the seat 10.
[0023]
Middle tube 7 is extended to the inside of the upper casing 103 by Rukoto upper intermediate cylinder 7A is connected at its upper end. Further, the upper end of the upper intermediate tube 7A, and the guide portion 7B which slides supporting the upper indenter shaft 8A is provided for guiding the upper portion of the guide portion 7B, the guide shaft 15A via a bolt 7E guide It is attach a piece 7D. With this configuration, the intermediate tube 7 has an inner of the two casings 100, 105 are vertically movable. Furthermore, being Attach connecting cylinder 12 to the lower end of the intermediate tube 7 is collected, that have cylindrical reference piece 27 is Ri attached taken to the lower end of the connecting tube 12. The reference piece 27 is disposed so as to face the surface of the placed sample 14 on the sample stage 113, by the lowering of the intermediate tube 7, the lower end surface of the reference piece 27 to the surface of the sample 14 equivalents It comes to touch. An upper end portion is supported by the lower casing 105 and a lower end portion of a pressing spring 24 capable of applying a pressing force fc is engaged with the spring receiver 7a placed on the lower flange portion 7c of the intermediate cylinder 7. Then, along the vertical center axis of the intermediate cylinder 7, the indenter shaft 8 is disposed. Indenter shaft 8, an intermediate shaft 21A thereabove, an upper indenter shaft 8A is being sequentially connected, has substantially the same length lengths of the middle tube 7 extends I cotton substantially the entire length of the measuring head 100 Has been .
Reference numeral 21D denotes a connector for connecting the intermediate shaft 21A and the upper indenter shaft 8A. The connection member 21 D has a detent 21 C.
[0024]
Below the indenter shaft 8, can abut conical stopper 8a conically receiving portion 27a integral with reference pieces 27 are attached. Further , an indenter holder 49 is attached to the lower end portion of the indenter shaft 8, and a ball 47 as an indenter is attached to the indenter holder 49. An upper end portion is supported on the indenter shaft 8 on the intermediate cylinder 7, and a lower end portion of an initial load spring 25 capable of applying an initial load f ₁ to the indenter 47 is engaged with the indenter shaft 8. Reference numeral 26 denotes a spring seat of the initial load spring 25 provided integrally with the indenter shaft 8.
[0025]
Indenter shaft 8, (indicated symbol X is the sliding guide portion) slidably fitted in and the guide portion 7B of the upper end thereof as the upper portion of the intermediate tube 7 by the upper indenter shaft 8A. Thus, the indenter shaft 8 is movable is slidably guided intermediate cylinder 7 in the vertical direction in the upper portion of the upper end thereof the intermediate tube 7.
Reference numeral 20 denotes a load receiving surface of the indenter shaft 8.
[0026]
Further, as shown in FIGS. 2 and 3 (a) and 3 (b), the intermediate shaft 21A is formed with a long hole 21a in the axial length direction. support fitting 6 which projects is provided, the displacement sensor 30 is Ri attached taken on the support fitting 6. Displacement sensor 30 is for the spindle (feeler) 31 for measuring the relative displacement between the reference piece 27 and the indenter 47 by Rukoto into contact with the upper end portion of the indenter shaft 8.
Reference numeral 30 a indicates a signal extraction cable of the displacement sensor 30.
As the displacement sensor may be used such as a linear scale and a differential transformer.
[0027]
Meanwhile, inside the upper casing 103, load shaft 16, are arranged in the so that are opposed to the lower end of the load receiving surface 20 of the indenter shaft 8. The load shaft 16 is attach to the flange portion 17b of the spring receiver only 17 integral with the support member 17a slidably guided vertically in the upper casing 103. The support member 17a is supported by the upper casing 103 via an insulating piece 19, and is supported by a receiving seat 18 having a conical receiving portion 18a. Incidentally, the bolt 7E is disposed through the flange portion 17b of the support member 17a.
[0028]
Furthermore, between the lid member 15 of the spring receiver only 17 and the upper casing 103, the test load spring 2 capable of imparting a test load to the indenter shaft 8 through the loading axis 16 is interposed. Reference numeral 15b denotes an adjusting screw for adjusting the test load engages the spring accept 2a of the load spring 2.
[0029]
At the center of the lid member 15 is a guide shaft 15A that contacts the roller 101a (see FIG. 7) at the tip of the lever 101 , receives the operating force of the hydraulic cylinder 102 via the lever 101, and transmits it to the measuring head 100. Are screwed together.
A lower surface portion of the guide shaft 15A is formed with a surface Z that constitutes a guide surface in sliding contact with a guide piece 7D as an upper member of the intermediate tube 7, and the peripheral surface of the load shaft 16 is also above the intermediate tube 7. A guide surface Y is formed in sliding contact with the guide portion 7B as a member.
At the lower end of the indenter shaft 8, as shown in FIG. 4, the indenter (ball) 47 is rotatably supported by the ball holding member 71.
[0030]
Further, a cylindrical sample sensor 72 is fitted on the outer periphery of the reference piece 27 so as to be movable in the vertical direction. The lower end portion of the sample sensor 72 is formed on four tongue pieces 72a at intervals of 90 ° (see FIGS. 5A and 5B). On the other hand, the lower end dish portion 27c of the reference piece 27 has recessed spaces 27b into which the tongue pieces 72a can be inserted from below (see FIGS. 6A and 6B). When the tongue piece 72a is inserted into the fitting space 27b from below when the tongue piece 72 is moved upward, the lower end dish-shaped portion 27c of the reference piece 27 is in direct contact with the surface of the sample 14 (the tongue of the tip portion of the sample sensor 72). The strip 72a) is not disturbed.
Reference numeral 76 shows a sample sensor spring which lightly pressed downwardly sample sensor 72.
[0031]
The lowermost end of the intermediate cylinder 12, conductor made of seat 77 to form a contact of the sample sensor switch S ₃ is mounted through an insulator 73.
Reference numeral 77a denotes a terminal lead of the switch S _3.
The outer periphery of the sample sensor 72 that has a ring 75 is mounted. The sample sensor 72 is pushed downward by the spring 76 to a position where the ring 75 contacts the seat 77.
[0032]
Meanwhile, seat 10 and seat 18, since both are also electrically insulated with respect to the support member, they seat 10, 18 and the intermediate tube 7 or the spring receiver only 17 respectively initial load detected by use switch S _1, the test load detecting switch S ₂ is constituted, also, the load state detection mechanism is configured that could be detected initial load load condition and test load application state respectively by the switch S ₁ and S ₂ . The on / off state of the switches S ₁ , S ₂ , S ₃ is displayed on the pilot lamps 56a, 56b, 56c of the display 55. Reference numeral 10a is the lead of the switch S _1, 18a denotes respectively the leads of the switch S _2.
Reference numerals 107 and 108 denote guide rollers that roll around the upper casing 103 and the lower casing 105 to guide the vertical movement thereof.
[0033]
As shown in FIG. 7, the measuring head 100 is arranged to be moved up and down by the guide rollers 107 and 108 on the machine frame 120 of the test apparatus. A sample support 110 is disposed on the machine frame 120 coaxially with the measurement head 100. The sample support 110 is provided with a sample table 113 that can be moved up and down by a screw shaft 111. Further , a gear device 112 that moves the sample table 113 up and down by a drive source (not shown) is provided. ing.
[0034]
Lever 101, along with its middle portion is pivotally attached by pivot 101b to machine frame 120 of the test apparatus, and includes a contacting roller 101a in the guide shaft 15A of the measuring head 100 to the left end. Further, in its right end portion, the rod 102a of the hydraulic cylinder 102 is engaged. Reference numeral 102b denotes a hydraulic unit.
[0035]
In the above-described configuration, automatic hardness measurement is performed according to the following procedure.
First, the sample 14 is placed (fixed) on the sample table 113 (step A ₁ ). Next , the screw shaft 111 is rotated by driving the motor to raise the sample table 113 (step A ₂ ). When the sample table 113 is raised , the sample 14 contacts the tongue piece 72a of the sample sensor 72 of the measuring head 100, and the sample sensor 72 is pushed up.
[0036]
Since the tongue piece 72a protrudes slightly below the indenter 47 (dimension b in FIG. 4: 0.5 mm, for example) , the tongue piece 72a first contacts the sample 14 when the sample table 113 is raised.
[0037]
When the sample sensor 72 is pushed, the ring 75 of the sample sensor 72 away from the seat 77 as the contacts of the switch S _3, the switch S ₃ is turned off, thereby pre-condition is detected in the measurement (Step A ₃₎ .
[0038]
The OFF signal for the switch S _3, it stops increasing of the screw shaft 111, raising the sample table 113 is stopped (Step A _4).
[0039]
Next, the hydraulic cylinder 102 is operated to lower the measuring head 100 and press the indenter 47 and the reference piece 27 against the sample 14.
Indenter shaft 8, the at no load, the conical surface 8a is brought into contact with the conical receiving surface 27a, the indenter 47 is slightly larger than the dished portion 27a of the reference piece 27 lower end (dimension in Figure 4 a: for example 2.5 mm) It is designed to protrude.
Further, in this state, indenter protrusion amount a larger gap (not shown) is maintained between the load receiving surface 20 and the lower end surface of the loading axis 16.
[0040]
When measurement head 100 is further pressed and lowered, the indenter 47 is brought into contact with the sample 14 cone receiving portion 27a of the reference piece 27 from the spring receiver 8a of the indenter shaft 8 is disengaged downwardly, initial load f by initial load spring 25 ₁ is added to the indenter 47.
[0041]
When measurement head 100 is further pressed and lowered, the reference piece 27 is brought into contact with the sample 14, the is further measuring head 100 is pressed down, pressing the spring 24 pressing the lower end portion of the intermediate tube 7 is separated from the seat 10 with a reference piece 27 by the force fc is depressed, the switch _{S 1} is the OFF (step _a 5).
[0042]
In this way, the pressing force of fc by the spring 24 pressed against the reference piece 27, also in a state where the initial load f ₁ by initial load spring 25 applied (referred to as a reference load condition) to the indenter 47. In this state, the displacement meter is set to zero.
[0043]
When measurement head 100 is further pressed and lowered, it abuts the lower end load receiving surface 20 of the loading axis 16, load shaft 16 integral with the spring receiver only 17 away from the conical shape of the receiving surface 18a of the seat 18 Runode, test load f ₂ becomes test load state is added to the indenter 47 with test load spring 2 (step a _6). The switch S ₂ is turned OFF by the spring receiver only 17 leaves the seat 18, it is now the state is displayed to the pilot lamp 56.
[0044]
When the measuring head 100 is raised from this state (test load state) and the test load f ₂ is removed (step A ₇ ) , the switch S ₂ is switched from OFF to ON, and the displacement sensor at that time The indicated value of 30 is input to the computer (step A ₈ ) . Then , this is converted into hardness based on a calculation formula inputted in advance and displayed as hardness on the measured value display panel of the display 55 (step A ₉ ).
[0045]
Thereafter, when the hydraulic cylinder 102 returns to the original state, the measuring head 100 also returns to the original state. Further, the sample is taken out, and the sample table 113 descends to the next sample loading position and automatically stops (Step A ₁₀ ).
[0046]
As described above, in the measurement head for the penetration depth type hardness measurement apparatus according to this embodiment, after the sample approaching operation with respect to the measurement head is completed by the sample sensor provided on the measurement head side, the measurement head is driven and a series of operations is performed. It is possible to automate the operation for the hardness measurement.
[0047]
When measuring the hardness, in the measuring head of this embodiment, the indenter shaft 8 is formed to have an overall length substantially the same as the casing of the measuring head 100, and at the upper end, near the upper end of the intermediate cylinder 7. Therefore, the distance (dimension) from the lower end portion to which the indenter 47 is attached to the upper end portion as the sliding support portion is far greater than the conventional one shown in FIG. Can be set longer. As a result, even if the pressurization point of the indenter 47 (with respect to the sample) is slightly displaced from the central axis of the indenter shaft 8 during the hardness test, the inclination angle of the indenter shaft 8 due to this displacement can be kept small. , the posture of the indenter shaft 8 and the intermediate tube is stabilized, as a result, it is possible to suppress Runode can increase the degree of matching with the load direction of the axis and the test load of the indenter shaft 8, the measurement error small.
[0048]
【The invention's effect】
As described above in detail, according to the measuring head for the penetration depth type hardness measuring device of the present invention, the degree of alignment between the indenter shaft and the load direction of the test load can be increased during the hardness test, There is an advantage that the measurement error can be reduced.
[Brief description of the drawings]
FIG. 1 is a front sectional view of a penetration depth type hardness measuring apparatus head according to an embodiment of the present invention.
FIG. 2 is a side sectional view of the arrow portion in FIG.
FIG. 3A is an exploded perspective view of the arrow A in FIG.
(b) is a cross-sectional view taken along the line of FIG.
FIG. 4 is an enlarged front sectional view near the lower end of the indenter shaft.
FIG. 5A is a front sectional view of the sample sensor.
(b) is a bottom view of the same.
FIG. 6A is a front sectional view of the reference piece.
(b) is a bottom view of the same.
FIG. 7 is a schematic front view of the entire measurement apparatus.
FIG. 8 is a front view of a measuring head of a conventional penetration depth type hardness measuring apparatus.
[Explanation of symbols]
1 spring receiver only 2 test load spring 3 test load case 4 sliding piece 5 press and with only cylinder 6 Bracket 7 intermediate cylinder 7A upper intermediate tubular 7B guide portion 7C lower flange 8 indenter shaft 8A upper indenter shaft 9 supporting ring
10 seat
10a Conical receiving surface
11 Insulation piece
12 Connection tube
13 Indenter
14 samples
15 lid
15A Guide shaft
16 Load axis
17 spring receiver
18 Seat
18a Conical receiving surface
19 Insulation piece
20 Load receiving surface
21A Intermediate shaft
22 coils
23 Core shaft
24 Pressing spring
25 Initial load spring
26 spring receiver
27 Reference strip
27a Conical receiving surface
27b Insertion space
27c Plate-shaped part
30 Displacement sensor
31 spindle
47 Ball as indenter
49 Indenter holder
55 Display
56a, 56b, 56c Pilot lamp
60 Measuring head
72 Sample sensor
72a tongue
73 Insulator
75 rings
76 Sample sensor spring
77 Conductor seat
100 measuring head
101 lever
101a Laura
101b spindle
102 Hydraulic cylinder
103 Upper casing
105 Lower casing
107, 108 Guide roller
110 Sample support
111 screw shaft
112 Gearing device for sample table rotation
113 Sample table
120 machine frame

Claims (1)

A casing forming the outer shell of the measuring head;
With the upper end portion is slidably supported in the vertical direction by the guide shaft provided in the upper portion of the casing, the lower end portion is not have a length which extends below the lower end of the casing, the An intermediate cylinder with a reference piece attached to the lower end ,
And indenter shaft indenter is attached to the lower end, e Bei,
The indenter shaft, with its upper end is slidably supported in the vertical direction in the vicinity of the upper end portion of the intermediate tube, the lower end so as to extend downward from the lower end of the middle tube, Arranged inside the intermediate cylinder ,
A spring receiver, which receives a test load spring interposed between the casing and a test load on the indenter shaft in a position below the upper end surface of the indenter shaft in the casing, Slidably provided,
The spring support is integrally provided with a cylindrical support member that protrudes upward, and the upper ends of the intermediate cylinder and the indenter shaft are disposed inside the support member, respectively. A measuring head for a penetration depth type hardness measuring device.

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