CN117268967A - Bearing tapered roller hardness detection workbench and detection and calibration method - Google Patents

Bearing tapered roller hardness detection workbench and detection and calibration method Download PDF

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Publication number
CN117268967A
CN117268967A CN202311552510.5A CN202311552510A CN117268967A CN 117268967 A CN117268967 A CN 117268967A CN 202311552510 A CN202311552510 A CN 202311552510A CN 117268967 A CN117268967 A CN 117268967A
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China
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calibration
tapered roller
mounting hole
connecting seat
adjusting
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CN202311552510.5A
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CN117268967B (en
Inventor
刘胜春
成善强
孙运奖
王雅琪
王辛吉
李嘉鑫
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Shanghai Shangjing Bearing Quality Testing Institute Co ltd
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Shanghai Shangjing Bearing Quality Testing Institute Co ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/40Investigating hardness or rebound hardness
    • G01N3/42Investigating hardness or rebound hardness by performing impressions under a steady load by indentors, e.g. sphere, pyramid
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02Details
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/62Manufacturing, calibrating, or repairing devices used in investigations covered by the preceding subgroups

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)

Abstract

The invention discloses a bearing tapered roller hardness detection workbench and a detection and calibration method, which belong to the field of hardness detection, are arranged at the upper end part of a connecting seat of a Vickers hardness tester and comprise a special base, a workpiece placement table and a calibration and adjustment mechanism; the detection workbench is suitable for the Vickers hardness tester, has a simple structure, is easy to adjust and operate, overcomes the defect of alignment by experience of operators in the prior art, improves the measurement precision and accuracy, and does not need repeated measurement.

Description

Bearing tapered roller hardness detection workbench and detection and calibration method
Technical Field
The invention belongs to the field of hardness detection, and particularly relates to a bearing tapered roller hardness detection workbench and a detection and calibration method.
Background
Bearing tapered rollers are widely used in industries such as automobiles, rolling mills, mines, metallurgy, plastic machinery and the like, and the bearings are divided into single-row, double-row, four-row bearing tapered rollers and other different structural types according to the row number of the installed rollers. The bearing tapered roller mainly bears radial and axial combined loads mainly in the radial direction. Therefore, in the development process of the bearing, the hardness of the tapered roller needs to be continuously detected by a hardness tester so as to ensure the capability of bearing tapered roller to bear combined load. Currently, a vickers hardness tester is used to measure the hardness of metal materials having various shapes and structures, but the vickers hardness tester is generally configured with a measuring platform, as shown in fig. 1, the conventional vickers hardness tester 2 includes a pressing head 21, a work table 22, a connection seat 23 and a support column 24, which are sequentially connected one above the other, disposed on a base 25, wherein the support column 24 is fixedly connected with the base 25, and the work table 22 is placed on the connection seat 23.
In actual detection, because the pressure head of the hardness tester is spherical (pyramid), when the diameter of the steel ball to be detected is smaller, the top point of the pressure head is difficult to align with the highest point of the steel ball, namely, the center of the measuring pressure head is not in the same center position with the center of the steel ball, when certain load is applied in measurement, the center cannot be aligned, the pressure head and the steel ball are easy to deviate, the measured hardness data are inaccurate, and even the pressure head can be pressed and jumped, so that the pressure head is damaged, and a detection task cannot be successfully completed. In order to solve the above problems, the available machine in Chinese toon (Taiku) limited company applies for a special fixture for measuring a Rockwell hardness tester, and the invention patent with publication No. CN102252905B, wherein the disclosed special fixture is used for adjusting the position of a measuring workpiece platform by arranging four adjusting fixing screws on the outer side of a platform fixing base, when in measurement, a steel ball product is put into a conical measuring groove, and the four adjusting fixing screws are adjusted, so that the center of a pressure head of the hardness tester is consistent with the center of the steel ball, then the measuring workpiece platform is fixed, and the measuring precision is ensured. However, the special fixture disclosed in the patent is suitable for a rockwell hardness tester, can measure a workpiece with a larger diameter, calibrates the center of the workpiece with the vertex of a pressure head according to the experience of an operator during center alignment, has a complex structure, cannot be effectively applied to the existing vickers hardness tester for measuring a workpiece with a small diameter (the diameter is smaller than 4 mm), cannot rotate relative to a base due to the action of the second screw 11, and needs to rotate a measuring working platform to perform center alignment when measuring the hardness of a tapered roller, so that the special fixture cannot be applied to hardness measurement of the tapered roller; on the other hand, when the special fixture is used, firstly, the steel ball is placed in the conical measuring groove, then, the calibration center is adjusted, the alignment is directly observed by naked eyes, the direct observation is very much related to the working experience of detection staff, the complete center alignment is very difficult to realize, the error of the detection result is very large, sometimes the measurement error is even more than fifty percent, and the measurement error caused by the manual alignment can be reduced as much as possible in the mode of repeated measurement and averaging in the prior art.
Disclosure of Invention
The invention aims to solve the defects of the prior art, and aims to provide a bearing tapered roller hardness detection workbench and a detection and calibration method.
On the other hand, the bearing tapered roller hardness detection workbench can rotate by an angle so as to calibrate the generatrix of the tapered roller and the pressure head when in multipoint measurement, and all hardness detection points of the pressure head are on the same straight line.
In still another aspect, the bottom of the V-shaped groove of the bearing tapered roller hardness detection workbench is provided with a calibration groove, the opening shape and the size of the calibration groove are matched with those of the tip of the Vickers hardness tester pressure head, and the calibration groove is specially used for calibrating the V-shaped groove of the workbench with the center of the Vickers hardness tester pressure head.
In still another aspect, the detection and calibration method provided by the invention overcomes the problems of pressure head bursting, bias voltage and the like existing in the prior art that the alignment is carried out by the experience of an operator when the hardness of a large workpiece and a small workpiece is detected, improves the measurement precision and accuracy, and does not need multiple measurements.
The invention provides a bearing tapered roller hardness detection workbench which is arranged at the upper end part of a connecting seat of a Vickers hardness tester and comprises a special base, a workpiece placing table and a calibration and adjustment mechanism;
the special base is provided with a workpiece placement table mounting hole and a connecting seat mounting hole which are communicated up and down, and the workpiece placement table is rotatably arranged in the workpiece placement table mounting hole and extends out of the upper surface of the special base; the connecting seat gap is arranged in the connecting seat mounting hole and is abutted against the workpiece placing table;
the upper surface of the workpiece placing table is provided with a V-shaped groove with a certain length and is used for being aligned with the center of the pressure head in one-time correction; the bottom of the V-shaped groove is provided with a calibration groove, and the size and shape of the opening of the calibration groove are matched with the pointed end of the pressure head and are used for secondary correction and alignment of the pressure head;
the calibration adjusting mechanism comprises two groups of adjusting assemblies, and each group of adjusting assemblies comprises an elastic element and an adjusting screw rod which are oppositely arranged on the side wall of the mounting hole of the connecting seat and simultaneously abut against the connecting seat.
Preferably, the diameter of the workpiece placement table mounting hole is smaller than that of the connecting seat mounting hole, and a downward step with a downward opening is formed at the joint of the workpiece placement table mounting hole and the connecting seat mounting hole;
an upper step with an upward opening is arranged on the outer surface of the workpiece placing table;
when the workpiece placing table is placed in the workpiece placing table mounting hole, the upper step is in interference fit with the lower step.
Preferably, two groups of adjusting holes are formed in the side wall of the mounting hole of the connecting seat, each group of adjusting holes comprises a threaded through hole and a spring blind hole which are opposite, one adjusting screw rod is arranged in each threaded through hole, an elastic element is arranged in each spring blind hole, and the elastic element can be a spring, a corrugated pipe, a spring pipe or elastic rubber.
Preferably, the central lines of the two groups of the adjusting assemblies are arranged vertically.
Preferably, the calibration and adjustment mechanism further comprises a horizontal scale block arranged on the outer surface of the special base at the upper part of each adjusting screw, and a horizontal scale is arranged on the horizontal scale block; the adjusting screw is provided with a first circumferential graduated scale, the horizontal position of the special base is adjusted through the first circumferential graduated scale and the horizontal graduated scale, so that the pressure head falls into the V-shaped groove and the calibration groove to realize accurate calibration, and the size of the indentation generated by hardness detection is measured.
Preferably, a second circumferential scale is arranged on the upper end surface of the special base around the workpiece placing table mounting hole, and is used for measuring the cone angle of the tapered roller placed in the V-shaped groove.
The invention also provides another bearing tapered roller hardness detection workbench which is arranged at the upper end part of the Vickers hardness tester connecting seat and comprises a special base, a workpiece placing table and a calibration and adjustment mechanism;
the special base is provided with a workpiece placing table mounting hole and a connecting seat mounting hole which are not communicated up and down, and the workpiece placing table is rotatably arranged in the workpiece placing table mounting hole and extends out of the upper surface of the special base; the connecting seat gap is arranged in the connecting seat mounting hole;
the upper surface of the workpiece placing table is provided with a V-shaped groove with a certain length and is used for being aligned with the center of the pressure head in one-time correction; the bottom of the V-shaped groove is provided with a calibration groove, and the size and shape of the opening of the calibration groove are matched with the pointed end of the pressure head and are used for secondary correction and alignment of the pressure head;
the calibration adjusting mechanism comprises two groups of adjusting assemblies, and each group of adjusting assemblies comprises an elastic element and an adjusting screw rod which are oppositely arranged on the side wall of the mounting hole of the connecting seat and simultaneously abut against the connecting seat.
Preferably, two groups of adjusting holes are formed in the side wall of the mounting hole of the connecting seat, each group of adjusting holes comprises a threaded through hole and a spring blind hole which are opposite, one adjusting screw rod is arranged in each threaded through hole, an elastic element is arranged in each spring blind hole, and the elastic element can be a spring, a corrugated pipe, a spring pipe or elastic rubber.
Preferably, the central lines of the two groups of the adjusting assemblies are arranged vertically.
Preferably, the calibration and adjustment mechanism further comprises a horizontal scale block arranged on the outer surface of the special base at the upper part of each adjusting screw, and a horizontal scale is arranged on the horizontal scale block; the adjusting screw is provided with a first circumferential graduated scale, the horizontal position of the special base is adjusted through the first circumferential graduated scale and the horizontal graduated scale, so that the pressure head falls into the V-shaped groove and the calibration groove to realize accurate calibration, and the size of the indentation generated by hardness detection is measured.
Preferably, a second circumferential graduated scale is arranged on the upper end surface of the special base around the workpiece placing table mounting hole in a circle and is used for measuring the cone angle of the bearing tapered roller placed in the V-shaped groove.
On the other hand, the invention also provides a bearing tapered roller hardness detection and calibration method, which uses any one of the bearing tapered roller hardness detection working tables to perform center calibration, and comprises the following steps:
step 1, mounting a bearing tapered roller hardness detection workbench on a connecting seat of a Vickers hardness tester;
step 2, adjusting the special base to a height suitable for hardness detection, and rotating the workpiece placing table to enable the center line of the V-shaped groove to be parallel to the center line of one of the adjusting screw rods;
step 3, moving the pressure head downwards to align the pointed end of the pressure head with the center of the V-shaped groove;
step 31, adjusting the horizontal position of the V-shaped groove on the workpiece placing table through an adjusting lead screw;
step 32, moving the pressure head downwards into the V-shaped groove, and performing primary center correction alignment;
and 33, continuing the pressure head to enable the tip of the pressure head to enter the calibration groove to perform secondary center alignment, wherein the pressure head is aligned with the center of the V-shaped groove.
The special base is suitable for a conventional Vickers hardness tester, the center calibration is realized through the calibration adjusting mechanism, the V-shaped groove and the calibration groove, and the mechanical calibration of the centers of the pressure head and the V-shaped groove can be realized before detection, so that the center calibration is carried out independently of the experience of operators. Meanwhile, the device is specially used for measuring the hardness of the tapered roller, and when the hardness of different points on the tapered roller central bus is measured, the bus and the center of the pressure head can be calibrated in real time by rotating the workpiece placing table; the invention has simple structure and easy adjustment operation, and the detection and calibration method of the patent performs center calibration before detection, improves the calibration precision, changes the defect that the center cannot be aligned due to the fact that the pressure head and the workpiece are directly calibrated after the workpiece is placed on a special workbench in the prior art, does not align the experience of operators, improves the measurement precision and accuracy, and does not need multiple measurements.
The special base is directly sleeved outside the top of the connecting seat of the Vickers hardness tester, the adjusting screw rod and the spring are directly arranged on the special base, and no other parts are needed to be matched to move the horizontal position of the special base, so that the structure of the workbench is greatly simplified.
The adjusting screw is provided with a first circumferential graduated scale, the horizontal graduated scale is arranged on the horizontal graduated scale block and is used for adjusting the horizontal position of the special base through the first circumferential graduated scale and the horizontal graduated scale when the pressure head of the Vickers hardness tester moves downwards to the V-shaped groove for calibration, and in addition, the size of the indentation can be measured after hardness detection. Meanwhile, the workbench can directly measure the size of the indentation under the condition of not moving the workpiece, so that the hardness detection parameter is obtained, and the measurement accuracy is accurate.
The special base is provided with a second circumferential graduated scale for measuring the taper angle of the workpiece.
These and other features, aspects, and advantages of the present application will become better understood with reference to the following description. The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.
Drawings
A full and enabling disclosure of the present application, including the best mode thereof, directed to one of ordinary skill in the art, is set forth in the specification, which makes reference to the appended figures, in which:
FIG. 1 is a front view of a prior art durometer provided in the background of the invention;
FIG. 2 is a schematic diagram of a hardness detection workbench for bearing tapered rollers;
FIG. 3 is a sectional view of a bearing tapered roller hardness testing table according to the present invention;
FIG. 4 is a schematic view of a part of a calibration adjustment mechanism of a bearing tapered roller hardness detection workbench according to the invention;
FIG. 5 is a diagram showing the shape of an indentation generated when the hardness of the bearing tapered roller hardness testing workbench of the present invention is tested;
fig. 6 is a schematic diagram of a bearing tapered roller hardness detection workbench for measuring taper angle of a tapered roller.
Reference numerals:
1. a special base; 11. a connecting seat mounting hole; 12. a workpiece placement table mounting hole; 13. a second circumferential scale; 14. a threaded through hole; 15. a spring blind hole;
2. vickers hardness tester; 21. a pressure head; 22. a work table; 23. a connecting seat; 24. a support column; 25. a base;
3. a workpiece placement table; 31. a V-shaped groove; 32. a calibration groove; 33. a step is arranged;
4. adjusting a screw rod; 41. a first circumferential scale; 5. a spring; 6. a horizontal scale block; 61. a horizontal scale; 7. indentation; 8. tapered rollers of the bearing.
Detailed Description
Reference now will be made in detail to embodiments of the application, one or more examples of which are illustrated in the drawings. Each example is provided by way of explanation, not limitation, of the present application. Indeed, it will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the scope or spirit of the application. For example, features illustrated or described as part of one embodiment can be used with another embodiment to yield a still further embodiment. Accordingly, it is intended that the present application cover such modifications and variations as come within the scope of the appended claims and their equivalents. As used in this specification, the terms "first," "second," and the like are used interchangeably to distinguish one component from another and are not intended to represent the location or importance of the respective components. As used in this specification, the terms "a," "an," "the," and "said" are intended to mean that there are one or more elements unless the context clearly indicates otherwise. The terms "comprising," "including," and "having" are intended to be inclusive and mean that there may be additional elements other than the listed elements.
Referring now to the drawings, in which like numerals represent like elements throughout, the present invention is further explained below in connection with specific embodiments.
As shown in fig. 1, the conventional vickers hardness tester 2 includes a ram 21, a table 22, a connection base 23 and a support column 24, which are sequentially connected up and down, disposed on a base 25, wherein the support column 24 is fixedly connected to the base 25, the table 22 is fixedly disposed on the connection base 23, the connection base 23 is connected to the support column 24, and the support column 24 can move up and down to adjust the height of the table 22.
The bearing tapered roller hardness detection workbench provided by the invention is characterized in that a workbench 22 on the conventional Vickers hardness tester 2 is removed and is assembled at the upper end part of a connecting seat 23 shown in fig. 1, so as to detect the hardness of a bearing tapered roller 8 with a smaller diameter.
As shown in fig. 1-3, the invention provides a bearing tapered roller hardness detection workbench, which comprises a special base 1 and a workpiece placement table 3.
The center of the special base 1 is provided with a workpiece placement table mounting hole 12 and a connecting seat mounting hole 11 which are communicated up and down, and the diameter of the workpiece placement table mounting hole 12 is smaller than that of the connecting seat mounting hole 11, so that a downward step with a downward opening is formed at the joint of the connecting seat mounting hole 11 and the workpiece placement table mounting hole 12.
The bottom of the outer surface of the workpiece placement table 3 is also provided with an upper step 33 with an upward opening, the workpiece placement table 3 stretches into the connecting seat mounting hole 11 from the bottom of the special base 1, stretches out from the workpiece placement table mounting hole 12, and the upper step 33 is in interference fit with the lower step, so that the workpiece placement table 3 cannot be separated from the workpiece placement table mounting hole 12.
The connection seat 23 is provided in the connection seat mounting hole 11 and abuts against the bottom surface of the work placement stage 3, so that the displacement of the work placement stage 3 in the vertical direction is limited.
A V-shaped groove 31 of a certain length is provided on the upper surface of the work placement stage 3 for placing the bearing tapered roller 8 in alignment with the indenter 21. In addition, the top of the ram 21 has a pointed tip, and in order not to damage the top of the ram 21 and the workpiece to be measured, a calibration groove 32 is provided, and when the ram 21 is pushed down completely into the V-groove 31, the pointed tip of the top of the ram 21 also protrudes into the calibration groove 32.
The ram 21 of a typical durometer is not aligned with the center of the support column 24, and the center of the work placement stage 3 placed in the dedicated base 1 connected to the connection base 23 is also not aligned with the center of the ram 21, and in order to align the vertex of the ram 21 with the center of the V-shaped groove 31 on the work placement stage 3, it is necessary to adjust the horizontal position of the dedicated base 1, that is, adjust the horizontal position of the V-shaped groove 31 so that the V-shaped groove 31 is aligned with the center of the ram 21.
For this reason this bearing tapered roller hardness detects workstation still includes calibration adjustment mechanism, and calibration adjustment mechanism includes two sets of calibration adjustment subassemblies that set up perpendicularly, and every group calibration adjustment subassembly includes adjusting screw 4 and spring 5 on connecting seat mounting hole 11 lateral wall in opposition. Correspondingly, two groups of adjusting holes with vertical central lines are formed in the side wall of the connecting seat mounting hole 11, each group of adjusting holes comprises a threaded through hole 14 and a spring blind hole 15, an adjusting screw 4 is arranged in each threaded through hole 14, and a spring 5 is arranged in each spring blind hole 15.
In order to be able to adjust the horizontal position of the special base 1, the connection seat 23 is clearance fitted with the connection seat mounting hole 11.
When the bearing tapered roller 8 is placed in the V-groove 31, the length direction of the V-groove 31 is not parallel to the center line of one of the adjusting screws 4, and it is very inconvenient to adjust the horizontal position of the V-groove 31 by adjusting the horizontal position of the dedicated base 1, for this purpose, the center line of the V-groove 31 needs to be disposed parallel to the center line of one of the adjusting screws 4, so that the work placement table 3 disposed in the work placement table mounting hole 12 needs to be rotatable with respect to the work placement table mounting hole 12.
In addition, when the bearing tapered roller 8 is placed in the V-groove 31, the diameters of the two ends of the bearing tapered roller 8 are unequal, the generatrix at the lowest end of the bearing tapered roller is sometimes not consistent with the central line of the V-groove 31, and can deviate from a certain angle, when the pressing head 21 is pressed down on the generatrix at the uppermost end of the bearing tapered roller 8 to be detected for hardness detection, hardness of a plurality of points needs to be detected along the generatrix at the uppermost end, when the generatrix of the bearing tapered roller 8 deviates from the central line of the V-groove 31, a plurality of hardness detection points beaten on the generatrix are not a straight line, but a spiral line, and in order to prevent the situation, the workpiece placement table 3 needs to be arranged to rotate relative to the workpiece placement table mounting hole 12 so as to rotate the workpiece placement table 3 to adjust the generatrix of the bearing tapered roller to be detected, and all hardness detection points beaten by the pressing head 21 are on the straight line, namely all the generatrix at the uppermost end.
When the pressing head 21 is aligned with the center of the V-shaped groove 31, the workbench 22 on the connecting seat 23 is firstly taken down, and the bearing tapered roller hardness detection workbench is installed. Specifically, the workpiece placement table 3 is installed into the workpiece placement table installation hole 12 from the lower part of the special base 1, the spring 5 is installed in the spring blind hole 15, and then the special base 1 is sleeved on the connecting seat 23. At this time, one end of the spring 5 is pressed against the inside of the spring blind hole 15, the other end is pressed against the surface of the connection seat 23, and the adjusting screw 4 is pressed against the outer surface of the opposite side of the connection seat 23 through the threaded through hole 14.
The workpiece placement stage 3 is then rotated so that the V-shaped groove 31 coincides with the center line of one of the adjustment screws 4 (referred to as the x-direction), and the center line of the V-shaped groove 31 is perpendicular to the center line of the other adjustment screw 4 (referred to as the y-direction). When the pressing head 21 is pushed down into the V-groove 31, if the pressing head 21 does not enter the V-groove 31, it is necessary to rotate the two adjusting screws 4 to adjust the horizontal position of the V-groove 31. When the ram 21 is inserted into the V-groove 31, the tip at the top of the ram 21 is inserted into the alignment groove 32, and the ram 21 is completely inserted into the V-groove 31, so that the ram 21 is aligned with the V-groove 31 for the first centering.
When the ram 21 is small, the V-shaped groove 31 is large, and the alignment groove 32 is provided with a large opening that is larger than the tip of the top of the ram 21, the ram 21 extends into the alignment groove 32, which affects the center alignment accuracy of the ram 21. For this purpose, the size and shape of the opening of the alignment groove 32 are matched with the tip of the top of the ram 21, so that when the tip of the top of the ram 21 extends into the alignment groove 32, the center of the ram 21 is further aligned, i.e., a secondary alignment is performed.
In addition, the position adjusting mechanism includes, in addition to the adjusting screws 4 and the springs 5, horizontal scale blocks 6 provided on the outer surface of the dedicated base 1 at the upper portion of each adjusting screw 4, as shown in fig. 4. The horizontal position of the V-shaped groove 31 in the special base 1 is precisely adjusted by adjusting the screw 4 and the horizontal scale block 6. Specifically, a first circumferential scale 41 is provided on the outer surface of the adjusting screw 4, and a horizontal scale 61 is provided on one side of the horizontal scale block 6. The line interval of the horizontal graduated scale 61 is 0.5mm, the pitch of the adjusting screw 4 is 0.5mm, namely, the adjusting screw 4 advances by 0.5mm when rotating for one circle, so that 50 score lines are uniformly engraved on the outer surface of the adjusting screw 4 for one circle, namely, the dividing of 0.5mm into 50 parts, and then the adjusting screw 4 advances by 0.01mm when rotating for one score line graduation, thereby realizing the shape position measurement in the direction. The horizontal distance of the special base 1 can be clearly known by the horizontal scale 61 and the first circumferential scale 41, and the horizontal position of the special base 1 can be conveniently adjusted by moving the special base 1 in the x-axis and the y-axis.
After the bearing tapered roller 8 is detected, the size of the indentation 7 in the bearing tapered roller 8 to be detected can be measured by the horizontal scale 61 and the first circumferential scale 41. As shown in fig. 5, the indentation 7 formed by the vickers hardness tester 2 is prismatic, and it is necessary to measure lengths in two directions of x-axis and y-axis of two center lines of the indentation 7, and the measurement of the x-axis will be described below as an example.
Specifically, after the hardness of the bearing tapered roller 8 to be tested is detected, the pressing head 21 is moved upwards, the tip at the top of the pressing head 21 is directed to one side of the x-direction indentation 7,then reading the now x-direction horizontal scale 61; then the adjusting screw 4 is rotated to enable the measured bearing tapered roller 8 placed in the V-shaped groove 31 to move along the x direction, the tip at the top of the pressure head 21 points to the other side of the x-direction indentation 7, then the reading of the current x-direction horizontal graduated scale 61 is read, and the difference between the two readings is the length of the indentation 7 in the x direction. The length of the indentation 7 in the y-direction is measured in the same way>Taking->And->And then look up the table to obtain the hardness value (the calculation method is the prior art and is not within the protection scope of the patent).
As shown in fig. 3 and 6, a second circumferential scale 13 for roughly measuring the taper angle of the placed bearing tapered roller 8 is provided around the work placement table mounting hole 12 at the top of the dedicated base 1.
The specific method comprises the following steps:
as shown in fig. 6, the bearing tapered roller 8 to be measured is placed in the V-shaped groove 31, a generatrix of the lowermost end of the bearing tapered roller 8 is parallel to the center line of the V-shaped groove 31, a first line L1 is led out outwards along the generatrix of the lowermost end of the bearing tapered roller 8, a second line L2 is led out outwards along the generatrix of the leftmost side or rightmost side of the bearing tapered roller 8, an included angle between projections of the first line L1 and the second line L2 on the upper surface of the special base 1 is half of a cone angle of the bearing tapered roller 8 to be measured, the projections of the first line L1 and the second line L2 on the upper surface of the special base 1 correspond to the second circumferential scale 13, and the included angle between the two projections is read out from the second circumferential scale 13.
In some embodiments, the workpiece placement table mounting hole 12 and the connecting seat mounting hole 11 disposed above and below the dedicated base 1 are not communicated, that is, the workpiece placement table mounting hole 12 and the connecting seat mounting hole 11 are blind holes.
The workpiece placing table 3 is rotatably arranged in the workpiece placing table mounting hole 12 and extends out of the upper surface of the special base 1, and the workpiece placing table 3 can be arranged in the workpiece placing table mounting hole 12 in a clearance manner; the connecting seat 23 is arranged in the connecting seat mounting hole 11 in a clearance way.
In some embodiments, other elastic elements than the spring 5, such as bellows, spring tube, elastic rubber, etc., may be placed in the spring blind hole 15 for adjusting the position.
The invention also provides a method for carrying out center calibration by using the bearing tapered roller hardness detection workbench, which comprises the following steps:
firstly, mounting a bearing tapered roller hardness detection workbench on a connecting seat 23;
specifically, the work placement stage 3 is mounted into the work placement stage mounting hole 12 from the lower portion of the dedicated base 1; the spring 5 is then mounted in the spring blind hole 15; the connecting seat 23 of the Vickers hardness tester 2 is arranged in the connecting seat mounting hole 11 in a clearance way; the adjusting screw 4 is screwed into the threaded through hole 14, and the opposing adjusting screw 4 and the spring 5 simultaneously abut against the outer surface of the connecting seat 23.
Secondly, adjusting the special base 1 to a height suitable for hardness detection through the support column 24, and rotating the workpiece placement table 3 to enable the center line of the V-shaped groove 31 to be parallel to the center line of an adjusting screw 4;
again, the apex of the ram 21 is aligned with the center of the V-groove 31;
specifically, when the pressing head 21 is moved down into the V-shaped groove 31, the horizontal position of the V-shaped groove 31 on the workpiece placing table 3 is adjusted by adjusting the screw rod 4, so that the pressing head 21 enters the V-shaped groove 31 to perform primary center alignment correction; continuing to press the pressing head 21 to enable the top point of the pressing head 21 to enter the calibration groove 32 for secondary center correction, wherein the top point of the pressing head 21 is aligned with the center of the V-shaped groove 31;
finally, the pressing head 21 is moved upwards, the bearing tapered roller 8 is placed in the V-shaped groove 31, the pressing head 21 is moved downwards, a certain load is applied, and the hardness of the bearing tapered roller 8 is detected.
The detection workbench is suitable for a conventional Vickers hardness tester 2, central calibration can be realized through a calibration adjustment mechanism, the pressure head 21 stretches into the V-shaped groove 31 to realize primary calibration, in order to improve the calibration precision, the bottom of the V-shaped groove 31 is provided with a calibration groove 32, and secondary calibration is performed when the tip of the pressure head 21 stretches into the calibration groove 32.
The invention can realize mechanical center calibration before detection, does not depend on experience of operators to perform center calibration, has simple structure and easy adjustment operation, and the detection and calibration method of the patent performs center calibration before detection, improves calibration precision, changes the defect that the center cannot be aligned due to direct calibration of the pressure head 21 and the workpiece after the workpiece is placed on the special base 1 in the prior art, does not need to perform alignment according to experience of operators, improves measurement precision and accuracy, and does not need multiple measurements. And only one calibration is needed when the hardness of different positions on the same bus of the tapered roller is required to be measured. The distance between different detection points of the tapered roller can be accurately measured by adjusting the scale arranged on the screw 4.
Even if the indenter 21 is aligned with the center of the V-groove 31, the tapered roller has different diameters at both ends, and when placed in the V-groove 31, the bus bar thereof is slightly deviated from the center of the V-groove 31, and the special work placement table 3 can be rotated in the horizontal plane with respect to the special base 1, so that the horizontal position of the V-groove 31 is slightly changed by rotating the work placement table 3 so that the tip of the indenter 21 is applied to the highest bus bar.
The special base 1 is directly sleeved outside the top of the connecting seat 23 of the Vickers hardness tester 2, the adjusting screw 4 and the spring 5 are directly arranged on the special base 1, and no additional parts are needed to be matched to move the horizontal position of the special base 1, so that the structure of the workbench is greatly simplified.
The adjusting screw 4 is provided with a first circumferential graduated scale 41, the horizontal graduated scale block 6 is provided with a horizontal graduated scale 61, and the adjusting screw is used for adjusting the horizontal position of the special base 1 through the first circumferential graduated scale 41 and the horizontal graduated scale 61 when the pressure head 21 of the Vickers hardness tester 2 moves downwards into the V-shaped groove 31 for calibration, and in addition, the size of the indentation 7 can be measured after hardness detection. Meanwhile, the workbench can directly measure the size of the indentation 7 under the condition of not moving a workpiece, so that the hardness detection parameter is obtained, and the measurement accuracy is accurate.
The special base 1 of the invention is provided with a second circumferential graduated scale 13 for measuring the cone angle of the workpiece.
This written description uses examples to disclose the application, including the best mode, and also to enable any person skilled in the art to practice the application, including making and using any devices or systems and performing any incorporated methods. The embodiments of the present application and the technical solutions obtained by slightly changing the embodiments are all within the protection scope of the present patent.

Claims (12)

1. The bearing tapered roller hardness detection workbench is characterized by being arranged at the upper end part of a connecting seat (23) of a Vickers hardness tester (2) and comprising a special base (1), a workpiece placing table (3) and a calibration and adjustment mechanism;
the special base (1) is provided with a workpiece placement table mounting hole (12) and a connecting seat mounting hole (11) which are communicated up and down, and the workpiece placement table (3) is rotatably arranged in the workpiece placement table mounting hole (12) and extends out of the upper surface of the special base (1); the connecting seat (23) is arranged in the connecting seat mounting hole (11) in a clearance manner and is abutted against the workpiece placing table (3);
the upper surface of the workpiece placing table (3) is provided with a V-shaped groove (31) with a certain length, and the V-shaped groove is used for being aligned with the center of the pressing head (21) in a primary correction way; the bottom of the V-shaped groove (31) is provided with a calibration groove (32), and the size and shape of an opening of the calibration groove (32) are matched with the pointed end of the pressure head (21) for secondary correction alignment of the pressure head (21);
the calibration adjusting mechanism comprises two groups of adjusting assemblies, and each group of adjusting assemblies comprises an elastic element and an adjusting screw rod (4), wherein the elastic element and the adjusting screw rod are oppositely arranged on the side wall of the connecting seat mounting hole (11) and simultaneously abut against the connecting seat (23).
2. The bearing tapered roller hardness detection workbench according to claim 1, wherein the diameter of the workpiece placement table mounting hole (12) is smaller than the diameter of the connecting seat mounting hole (11), and a downward step with a downward opening is formed at the joint of the workpiece placement table mounting hole (12) and the connecting seat mounting hole (11);
an upper step (33) with an upward opening is arranged on the outer surface of the workpiece placing table (3);
when the workpiece placement table (3) is placed in the workpiece placement table mounting hole (12), the upper step (33) is in interference fit with the lower step.
3. Bearing tapered roller hardness testing workbench according to claim 1 or 2, characterized in that two groups of adjusting holes are arranged on the side wall of the connecting seat mounting hole (11), each group of adjusting holes comprises a threaded through hole (14) and a spring blind hole (15) which are opposite, one adjusting screw rod (4) is arranged in each threaded through hole (14), and one elastic element is arranged in each spring blind hole (15), and the elastic element can be a spring (5), a corrugated pipe, a spring pipe or elastic rubber.
4. A bearing tapered roller hardness testing table according to claim 3, wherein the center lines of the two sets of said adjustment assemblies are arranged vertically.
5. The bearing tapered roller hardness detection workbench according to claim 1, wherein the calibration adjustment mechanism further comprises a horizontal scale block (6) arranged on the outer surface of the special base (1) at the upper part of each adjusting screw rod (4), and a horizontal scale (61) is arranged on the horizontal scale block (6); be provided with first circumference scale (41) on adjusting lead screw (4), through first circumference scale (41) with horizontal scale (61) adjustment the horizontal position of special base (1) makes pressure head (21) fall into V-arrangement groove (31) with realize accurate calibration in calibration groove (32), and measure indentation (7) size that hardness detection produced.
6. Bearing tapered roller hardness detection workbench according to claim 1, characterized in that a second circumferential scale (13) is provided on the upper end surface of the dedicated base (1) around the work placement table mounting hole (12) for measuring the taper angle of the bearing tapered roller (8) placed in the V-groove (31).
7. The bearing tapered roller hardness detection workbench is characterized by being arranged at the upper end part of a connecting seat (23) of a Vickers hardness tester (2) and comprising a special base (1), a workpiece placing table (3) and a calibration and adjustment mechanism;
the special base (1) is provided with a workpiece placing table mounting hole (12) and a connecting seat mounting hole (11) which are not communicated up and down, and the workpiece placing table (3) is rotatably arranged in the workpiece placing table mounting hole (12) and extends out of the upper surface of the special base (1); the connecting seat (23) is arranged in the connecting seat mounting hole (11) in a clearance way;
the upper surface of the workpiece placing table (3) is provided with a V-shaped groove (31) with a certain length, and the V-shaped groove is used for being aligned with the center of the pressing head (21) in a primary correction way; the bottom of the V-shaped groove (31) is provided with a calibration groove (32), and the size and shape of an opening of the calibration groove (32) are matched with the pointed end of the pressure head (21) for secondary correction alignment of the pressure head (21);
the calibration adjusting mechanism comprises two groups of adjusting components, and each group of adjusting components comprises an elastic element and an adjusting screw rod (4), wherein the elastic element and the adjusting screw rod are oppositely arranged on the side wall of the connecting seat mounting hole (11) and simultaneously abut against the connecting seat (23).
8. Bearing tapered roller hardness testing workbench according to claim 7, characterized in that two groups of adjusting holes are arranged on the side wall of the connecting seat mounting hole (11), each group of adjusting holes comprises a threaded through hole (14) and a spring blind hole (15) which are opposite, one adjusting screw rod (4) is arranged in each threaded through hole (14), and an elastic element is arranged in each spring blind hole (15), wherein the elastic element can be a spring (5), a corrugated pipe, a spring pipe or elastic rubber.
9. The bearing tapered roller hardness testing table according to claim 7 or 8, wherein the center lines of the two sets of the adjustment assemblies are arranged vertically.
10. The bearing tapered roller hardness detection workbench according to claim 7, wherein the calibration adjustment mechanism further comprises a horizontal scale block (6) arranged on the outer surface of the special base (1) at the upper part of each adjusting screw rod (4), and a horizontal scale (61) is arranged on the horizontal scale block (6); be provided with first circumference scale (41) on adjusting lead screw (4), through first circumference scale (41) with horizontal scale (61) are used for adjusting the horizontal position of special base (1) makes pressure head (21) fall into V-arrangement groove (31) with realize accurate calibration in calibration groove (32), and measure indentation (7) size that hardness detection produced.
11. The bearing tapered roller hardness detection workbench according to claim 7, wherein a second circumferential scale (13) is provided on the upper end surface of the dedicated base (1) around the work placement table mounting hole (12) for measuring the taper angle of the bearing tapered roller (8) placed in the V-groove (31).
12. A bearing tapered roller hardness detection and calibration method for performing center calibration by using the bearing tapered roller hardness detection workbench according to any one of claims 1 to 11, characterized by comprising the following steps:
step 1, mounting a bearing tapered roller hardness detection workbench on a connecting seat (23) of a Vickers hardness tester (2);
step 2, adjusting the special base (1) to a height suitable for hardness detection, and rotating the workpiece placing table (3) to enable the center line of the V-shaped groove (31) to be parallel to the center line of an adjusting screw rod (4);
step 3, moving the pressure head (21) downwards to align the tip of the pressure head (21) with the center of the V-shaped groove (31);
step 31, adjusting the horizontal position of the V-shaped groove (31) on the workpiece placing table (3) through the adjusting screw rod (4);
step 32, moving the pressure head (21) downwards into the V-shaped groove (31) to perform primary center correction alignment;
and 33, continuing to enable the pointed end of the pressure head (21) to enter the calibration groove (32) to perform secondary center alignment, wherein the pressure head (21) is aligned with the center of the V-shaped groove (31).
CN202311552510.5A 2023-11-21 2023-11-21 Bearing tapered roller hardness detection workbench and detection and calibration method Active CN117268967B (en)

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CN207180593U (en) * 2017-09-12 2018-04-03 上海联合滚动轴承有限公司 A kind of measurement apparatus of spherical base surface of tapered roller
CN209432636U (en) * 2018-10-31 2019-09-24 宝鸡法士特齿轮有限责任公司 A kind of double V-shaped hardness test saddle
CN211627185U (en) * 2020-01-18 2020-10-02 浙江定盘星智能科技有限公司 Liquid crystal blovudine hardness comprehensive test bed
CN114739345A (en) * 2022-05-19 2022-07-12 洛阳Lyc轴承有限公司 Measuring device and method for large tapered roller rolling surface modification curve
CN217084542U (en) * 2022-01-18 2022-07-29 赛轮集团股份有限公司 Positioning device for testing hardness of vulcanized rubber by Shore hardness tester
CN217638498U (en) * 2022-06-14 2022-10-21 苏州翔楼新材料股份有限公司 High-definition digital display Rockwell hardness tester
CN217981120U (en) * 2022-05-18 2022-12-06 天津市新天钢中兴盛达有限公司 Anchor tackle clamping piece hardness detects and uses frock

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202210064U (en) * 2011-08-19 2012-05-02 济南试金集团有限公司 Full-automatic Rockwell hardness tester
CN105466307A (en) * 2016-01-13 2016-04-06 奇瑞汽车股份有限公司 Steering engine gear rack precision value comprehensive detection device and test method
CN207180593U (en) * 2017-09-12 2018-04-03 上海联合滚动轴承有限公司 A kind of measurement apparatus of spherical base surface of tapered roller
CN209432636U (en) * 2018-10-31 2019-09-24 宝鸡法士特齿轮有限责任公司 A kind of double V-shaped hardness test saddle
CN211627185U (en) * 2020-01-18 2020-10-02 浙江定盘星智能科技有限公司 Liquid crystal blovudine hardness comprehensive test bed
CN217084542U (en) * 2022-01-18 2022-07-29 赛轮集团股份有限公司 Positioning device for testing hardness of vulcanized rubber by Shore hardness tester
CN217981120U (en) * 2022-05-18 2022-12-06 天津市新天钢中兴盛达有限公司 Anchor tackle clamping piece hardness detects and uses frock
CN114739345A (en) * 2022-05-19 2022-07-12 洛阳Lyc轴承有限公司 Measuring device and method for large tapered roller rolling surface modification curve
CN217638498U (en) * 2022-06-14 2022-10-21 苏州翔楼新材料股份有限公司 High-definition digital display Rockwell hardness tester

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