Straightening device and straightening method for contact type measuring head and measuring rod

Abstract

The invention belongs to the related technical field of straightening, and discloses a straightening device and a straightening method for a contact type measuring head and a measuring rod, the straightening device comprises a base 1, a chuck 3, a U-shaped clamp 4, a measuring rod lock seat 5, a fixed block 6, a gauge block 7 and a pull rod 8; according to the straightening device for the contact type measuring head and the measuring rod, a plurality of fixing devices and a plurality of stress devices are adopted, so that the stability and the straightening precision of the whole straightening device can be improved; the downward pressing distance of the measuring rod in the straightening process can be controlled through the gauge block, and the straightening precision is further improved; meanwhile, the measuring rod straightening device can be suitable for various different measuring rods, different straightening effects are achieved by adjusting the size of the measuring block, the measuring head does not need to be disassembled, the measuring rod can be directly straightened on the contact type measuring head, the straightening efficiency is improved, direct manual operation can be achieved in the straightening process, and the clamping process is simple and convenient.

Description

Technical Field

[0001] The present invention belongs to the technical field related to straightening, and more specifically, relates to a straightening device and a straightening method for a contact probe probe rod. Background Art

[0002] The machinery, automobile, motor and other industries use a large number of shaft and rod parts. The raw materials of these parts will inevitably bend and deform during rough machining or heat treatment. If they are not straightened, it will directly affect the subsequent processing and use of the workpiece, and may even produce a considerable amount of waste. In order to obtain the minimum cutting amount allowed by the next process or to ensure that the workpiece meets the strict final design tolerance requirements through precision straightening, the straightening machine has become an indispensable key equipment after the workpiece is heat treated. The coaxiality error between the ball head and the tool handle of the existing contact probe largely determines the measurement result of the probe. If the straightness of the probe rod is relatively poor, the contact point coordinates of the machine tool spindle will have measurement errors, which will further affect the workpiece measurement error.

[0003] The existing contact probe probes’ probe rods are prone to bending and deformation in practical applications. This is mainly because the probe rods are designed to be lightweight to accommodate precision measurements, but they are often difficult to maintain good straightness after being impacted by external forces or used for a long time. This deformation will directly lead to a decrease in the measurement accuracy of the probe, seriously affecting the reliability of the measurement results. When the probe rod is bent and deformed, the entire probe rod is generally replaced or disassembled and placed in a straightening device for straightening. At this time, the entire probe needs to be disassembled, which will greatly increase the cost of money and time.

[0004] In addition, existing probe rod straightening methods usually rely on manual adjustment or simple mechanical tools, which are not only complex, time-consuming and labor-intensive to operate, but also easily cause damage to the probe rod surface during the straightening process, such as scratches or microcracks, further reducing the service life of the probe rod. At the same time, the accuracy control of traditional straightening processes is poor, and it is often impossible to completely eliminate slight deviations after straightening, making it difficult to meet the strict requirements of modern industry for high-precision measurement. Therefore, it is urgent to design a contact probe probe rod straightening device that is efficient, accurate and non-destructive to the probe rod. Summary of the invention

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a straightening device and a straightening method for a contact probe probe rod, the purpose of which is to straighten the probe rod by the straightening device, thereby solving the technical problem of bending and deformation of the probe rod.

[0006] To achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided a straightening device for a contact probe rod, comprising a machine base 1, a chuck 3, a U-shaped clamp 4, a rod lock seat 5, a fixing block 6, a gauge block 7, and a pull rod 8; the machine base 1 comprises a clamping portion 11, a rod fixing portion 12, and a rod straightening portion 13 arranged in sequence from left to right; the chuck 3 is fixed to the clamping portion 11, and the clamping portion 11 and the chuck 3 are used to fix the contact probe structure 2; the contact probe structure 2 It includes a probe body 9 and a measuring rod 10; the U-shaped clamp 4 is arranged between the clamping part 11 and the measuring rod fixing part 12, and is fixed on the machine base 1, and is used to fit tightly with the tail of the measuring rod 10; the measuring rod locking seat 5 is installed and fixed on the measuring rod fixing part 12, and is used to fix the measuring rod 10; the fixing block 6 is installed on the gauge block 7, and the gauge block 7 is installed on the measuring rod straightening part 13, and the measuring rod 10 is in point contact with the fixing block 6; the pull rod 8 is connected to the chuck 3 through a rotating pair.

[0007] Preferably, the clamping portion 11 is provided with a limited trapezoidal groove for fixing the probe body 9; the chuck 3 includes a vertically connected fixed arm 32 and an upper cantilever 31, the fixed arm 32 is connected to the clamping portion 11 by bolts, and the upper cantilever 31 presses and fixes the upper part of the probe body 9.

[0008] Preferably, the pull rod 8 is a T-shaped structure, including a vertically connected pull rod portion 81 and a straightening portion 82; one end of the pull rod portion 81 is connected to the upper cantilever 31 of the chuck 3 through a rotating pair, and the other end is used for manual operation to apply load; the straightening portion 82 is used to clamp the measuring rod 10.

[0009] Preferably, a semi-cylindrical protrusion is provided at the tail end of the straightening portion 82 for pressing the measuring rod 10 and serving as a fulcrum during the straightening process.

[0010] Preferably, the U-shaped card 4 is fixed to the base 1 by bolts, and a U-shaped groove is provided at the center of the U-shaped card 4 for tightly fitting with the tail of the measuring rod 10 .

[0011] Preferably, the measuring rod lock seat 5 is fixed to the measuring rod fixing portion 12 by bolts, and the measuring rod lock seat 5 and the measuring rod fixing portion 12 are each provided with a semi-cylindrical groove that can cooperate with each other and form a cylindrical groove for fixing the measuring rod 10.

[0012] Preferably, the upper working surface of the fixing block 6 is configured as a semi-cylindrical surface for point contact with the measuring rod 10 to facilitate straightening operations.

[0013] Preferably, the surface roughness Ra of the gauge block 7 is 0.1-0.2 μm.

[0014] According to another aspect of the present invention, a method for straightening a stylus of a contact type probe is provided, using the above-mentioned straightening device for stylus of a contact type probe, comprising the following steps:

[0015] S1. Install and fix the contact probe structure: Place the probe body 9 firmly in the limit trapezoidal groove of the clamping portion 11, fix the probe 10 by the probe lock seat 5 and the probe fixing portion 12, and then use the U-shaped card 4 to further fix the probe 10 on the base 1;

[0016] S2. Place the fixed block 6 and the gauge block 7: Place the gauge block 7 on the measuring rod straightening portion 13, and firmly place the fixed block 6 on the gauge block 7;

[0017] S3. Straightening: By manually operating the pull rod 8 and applying a load, the measuring rod 10 is pressed down to the fixed block 6 for straightening operation;

[0018] S4. Calibration: Determine whether calibration is performed. If not, replace the gauge block 7 with a suitable size and repeat steps S2 and S3 until the straightness of the measuring rod 10 meets the straightening requirements.

[0019] In general, compared with the prior art, the above technical solution conceived by the present invention provides a contact probe probe rod straightening device, which mainly has the following beneficial effects:

[0020] 1. A straightening device for a contact probe rod of the present invention adopts multiple fixing devices and multiple force-bearing devices, which can improve the stability and straightening accuracy of the entire straightening device. At the same time, it can also disperse the force in the straightening process to multiple force-bearing devices to prevent a certain force-bearing device from being deformed due to excessive force.

[0021] 2. The present invention uses a gauge block to ensure the final straightening accuracy, that is, the gauge block can be used to control the distance that the measuring rod is pressed downward during the straightening process, thereby further improving the straightening accuracy.

[0022] 3. The straightening device for a contact probe measuring rod of the present invention can be applied to a variety of different measuring rods, and different straightening effects can be achieved by adjusting the size of the gauge block. Therefore, the straightening device has strong applicability and is conducive to popularization and application.

[0023] 4. The straightening device for the contact probe rod of the present invention does not need to disassemble the probe, and the rod can be directly straightened on the contact probe, thereby improving the straightening efficiency. The straightening process can be directly operated manually, and the clamping process is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a straightening device for a contact probe rod of the present invention;

[0025] Figure 2It is a front view of a straightening device for a contact type probe rod of the present invention;

[0026] Figure 3 It is a top view of a straightening device for a contact probe rod of the present invention;

[0027] Figure 4 It is a left side view of a straightening device for a contact type probe rod of the present invention;

[0028] Figure 5 It is a schematic structural diagram of a U-shaped chuck contact probe of the present invention;

[0029] Figure 6 It is a structural schematic diagram of the fixed block and the gauge block of the present invention;

[0030] Figure 7 It is a schematic structural diagram of the contact probe of the present invention.

[0031] Throughout the drawings, the same reference numerals are used to denote the same elements or structures, wherein:

[0032] 1-machine base, 11-clamping part, 12-measuring rod fixing part, 13-measuring rod straightening part, 2-contact probe structure, 3-chuck, 31-upper cantilever, 32-fixed arm, 4-U-shaped card, 5-measuring rod locking seat, 6-fixing block, 7-gauge block, 8-pull rod, 81-pull rod part, 82-straightening part, 9-probe body, 10-measuring rod. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0034] See also Figure 1-3 and Figure 7The present invention provides a straightening device for a contact probe and a measuring rod, comprising a machine base 1, a chuck 3, a U-shaped clamp 4, a measuring rod locking seat 5, a fixing block 6, a gauge block 7, and a pull rod 8; the machine base 1 comprises a clamping portion 11, a measuring rod fixing portion 12, and a measuring rod straightening portion 13 arranged in sequence from left to right; the chuck 3 is fixed to the clamping portion 11, and the clamping portion 11 and the chuck 3 are used to fix a contact probe structure 2; the contact probe structure 2 comprises a probe body 9 and a measuring rod 10; the U-shaped clamp 4 is arranged between the clamping portion 11 and the measuring rod fixing portion 12, and is fixed to the machine base 1, and is used to fit tightly with the tail of the measuring rod 10; the measuring rod locking seat 5 is installed and fixed to the measuring rod fixing portion 12, and is used to fix the measuring rod 10; the fixing block 6 is installed on the gauge block 7, and the gauge block 7 is installed on the measuring rod straightening portion 13, and the measuring rod 10 is in point contact with the fixing block 6; the pull rod 8 is connected to the chuck 3 through a rotating pair.

[0035] See also Figure 4 The clamping part 11 is provided with a limited trapezoidal groove for fixing the probe body 9 to limit the movement of the probe body 9 in multiple degrees of freedom and achieve precise positioning; the chuck 3 includes a vertically connected fixed arm 32 and an upper cantilever 31, the fixed arm 32 is connected to the clamping part 11 by bolts, and the upper cantilever 31 presses and fixes the upper part of the probe body 9.

[0036] The pull rod 8 is a T-shaped structure, including a vertically connected pull rod portion 81 and a straightening portion 82; one end of the pull rod portion 81 is connected to the upper cantilever 31 of the chuck 3 through a rotating pair, and the other end is used for manual operation to apply load; the straightening portion 82 is used to clamp the measuring rod 10.

[0037] The tail end of the straightening portion 82 is provided with a semi-cylindrical protrusion for pressing the measuring rod 10 and serving as a fulcrum during the straightening process. During the straightening process, the pull rod 8 is pulled to rotate around the chuck 3, so that the semi-cylindrical protrusion on the pull rod 8 presses the measuring rod 10 toward the fixed block 6.

[0038] See also Figure 1 and Figure 5 The U-shaped card 4 is fixed to the machine base 1 by bolts. It plays a counterweight role in the straightening process and provides a preload force when the contact probe structure 2 is installed to prevent large deformation when the straightening is started. A U-shaped groove is provided in the center of the U-shaped card 4 for tightly fitting with the tail of the measuring rod 10, which effectively reduces the stress borne by the measuring rod lock seat 5.

[0039] The measuring rod locking seat 5 is fixed to the measuring rod fixing part 12 by bolts to ensure its stability during the straightening operation; the measuring rod locking seat 5 and the measuring rod fixing part 12 are each provided with a semi-cylindrical groove that can cooperate with each other and form a cylindrical groove for fixing the measuring rod 10 to avoid displacement of the measuring rod 10 due to deformation or other external forces, thereby ensuring the accuracy of the straightening process and the reliability of the measurement results.

[0040] See also Figure 6 The upper working surface of the fixed block 6 is set as a semi-cylindrical surface, which is used to contact the measuring rod 10, which is convenient for straightening operation and effectively reduces the error caused by excessive contact area. The gauge block 7 has high surface accuracy and dimensional accuracy, and its surface roughness Ra is 0.1-0.2μm. By replacing gauge blocks 7 of different sizes, the downward pressure distance during the straightening process can be accurately controlled to ensure the accurate positioning of the measuring rod 10, thereby significantly improving the accuracy of the straightening.

[0041] In this example, a contact probe probe rod straightening method is provided, using the contact probe probe rod straightening device described above, comprising the following steps:

[0042] S1. Install and fix the contact probe structure: Place the probe body 9 firmly in the limit trapezoidal groove of the clamping portion 11, fix the probe 10 by the probe lock seat 5 and the probe fixing portion 12, and then use the U-shaped card 4 to further fix the probe 10 on the base 1;

[0043] S2. Place the fixed block 6 and the gauge block 7: Place the gauge block 7 on the measuring rod straightening portion 13, and firmly place the fixed block 6 on the gauge block 7;

[0044] S3. Straightening: By manually operating the pull rod 8 and applying a load, the measuring rod 10 is pressed down to the fixed block 6 for straightening operation;

[0045] S4. Calibration: Determine whether calibration is performed. If not, replace the gauge block 7 with a suitable size and repeat steps S2 and S3 until the straightness of the measuring rod 10 meets the straightening requirements.

[0046] In this embodiment, the material of the measuring rod (10) is stainless steel. By calculating the straightening load F and the reverse bending deformation f w , providing a reference for the load required to be applied for manually operating the pull rod 8 and the size selection of the gauge block 7.

[0047] The bending equation of the measuring rod (10) before straightening is:

[0048] v(x)=x 2 +(yb) 2 =b 2 (1.1)

[0049] Among them, v(x) is the bending curve equation before the shaft is straightened, x and y are the horizontal and vertical coordinates in the rectangular coordinate system, and b is a constant parameter representing the offset.

[0050] The calculation formula of the straightening load F is:

[0051]

[0052] Among them, Rt (x) is the elastic radius of any cross section of the measuring rod, R is the radius of the measuring rod, σ s is the yield limit of the material, v(x) is the bending curve equation of the measuring rod before straightening, F is the straightening concentrated force, L is the length of the measuring rod, E is the elastic modulus of the material, and Δ is the distance from the load application point to the fulcrum.

[0053] In MATLAB, the parameters of the metal material of the measuring rod are substituted into the above straightening load formula. The bending moment on any cross section can be obtained by integrating the circular cross section according to the distribution of cross-sectional stress. MATLAB calculates that the magnitude of the straightening load F is 1276.3N. In this embodiment, according to the lever principle, the actual length of the measuring rod and the fulcrum position, it can be known that the load required to be applied by the manual operation pull rod 8 is about one-sixth of the straightening load F, that is, about 210N. Therefore, the reference value of the load required to be applied by the manual operation pull rod 8 is about 210N.

[0054] The straightening of shaft parts belongs to the stage of elastic-plastic deformation, and the stress state of the measuring rod during the straightening process belongs to the concentrated load. Since elastic deformation is reversible and plastic deformation is irreversible, part of the deformation must be restored after elastic-plastic bending, and the other part is left. f0 is the initial deformation, f w is the reverse bending deformation. Only when the reverse bending deformation is equal to the elastic deformation f t Therefore, before the calibration begins, an initial reverse bending deformation f can be set for the corresponding size and material by referring to the load-deflection curve of the measuring rod material stainless steel. w , the reference value is 0.15mm. During the straightening process, multiple straightening experiments can be carried out to determine whether the straightening is accurate. If it is not calibrated, the amount of reverse bending deformation can be fine-tuned by replacing the gauge block with a size difference that is very small from the first straightening to ensure the appropriate amount of reverse bending deformation, thereby achieving more accurate straightening.

[0055] It will be easily understood by those skilled in the art that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A straightening device for a contact probe probe rod, characterized in that: The invention comprises a machine base (1), a chuck (3), a U-shaped clamp (4), a measuring rod locking seat (5), a fixing block (6), a gauge block (7), and a pull rod (8); the machine base (1) comprises a clamping portion (11), a measuring rod fixing portion (12), and a measuring rod straightening portion (13) which are arranged in sequence from left to right; the chuck (3) is fixed to the clamping portion (11), and the clamping portion (11) and the chuck (3) are used to fix a contact measuring head structure (2); the contact measuring head structure (2) comprises a measuring head body (9) and a measuring rod (10); the U-shaped clamp (4) is provided to fix the measuring head body (9) and the measuring rod (10); The profile card (4) is arranged between the clamping part (11) and the measuring rod fixing part (12), and is fixed on the machine base (1), and is used to fit tightly with the tail of the measuring rod (10); the measuring rod locking seat (5) is installed and fixed on the measuring rod fixing part (12), and is used to fix the measuring rod (10); the fixing block (6) is installed on the gauge block (7), and the gauge block (7) is installed on the measuring rod straightening part (13), and the measuring rod (10) and the fixing block (6) are in point contact; the pull rod (8) and the chuck (3) are connected through a rotating pair.

2. A contact probe probe rod straightening device as claimed in claim 1, characterized in that: The clamping portion (11) is provided with a limited trapezoidal groove for fixing the probe body (9); the clamping head (3) comprises a vertically connected fixing arm (32) and an upper cantilever arm (31); the fixing arm (32) is connected to the clamping portion (11) by bolts, and the upper cantilever arm (31) presses and fixes the upper part of the probe body (9).

3. A contact probe probe rod straightening device as claimed in claim 2, characterized in that: The pull rod (8) is a T-shaped structure, comprising a pull rod portion (81) and a straightening portion (82) connected vertically; one end of the pull rod portion (81) is connected to the upper cantilever (31) of the chuck (3) via a rotating pair, and the other end is used for manually applying a load; the straightening portion (82) is used to press the measuring rod (10).

4. A contact probe probe rod straightening device as claimed in claim 3, characterized in that: The tail end of the straightening portion (82) is provided with a semi-cylindrical protrusion for pressing the measuring rod (10) and serving as a fulcrum during the straightening process.

5. The straightening device for a contact probe rod according to claim 1, characterized in that: The U-shaped card (4) is fixed to the machine base (1) by means of bolts, and a U-shaped groove is provided at the center of the U-shaped card (4) for tightly fitting with the tail of the measuring rod (10).

6. A contact probe probe rod straightening device as claimed in claim 1, characterized in that: The measuring rod locking seat (5) is fixed to the measuring rod fixing portion (12) by means of bolts. The measuring rod locking seat (5) and the measuring rod fixing portion (12) are each provided with a semi-cylindrical groove that can cooperate with each other and form a cylindrical groove for fixing the measuring rod (10).

7. A contact probe probe rod straightening device as claimed in claim 1, characterized in that: The upper working surface of the fixed block (6) is arranged as a semi-cylindrical surface, which is used for point contact with the measuring rod (10) to facilitate straightening operation.

8. The straightening device for a contact probe rod according to claim 1, characterized in that: The surface roughness Ra of the gauge block (7) is 0.1-0.2 μm.

9. A method for straightening a stylus of a contact type probe, using the device for straightening a stylus of a contact type probe according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Install and fix the contact probe structure (2): Place the probe body (9) firmly in the limit trapezoidal groove of the clamping portion (11), fix the probe (10) by the probe lock seat (5) and the probe fixing portion (12), and then use the U-shaped card (4) to further fix the probe (10) on the machine base (1); S2. Place the fixed block (6) and the gauge block (7): Place the gauge block (7) on the measuring rod straightening portion (13), and firmly place the fixed block (6) on the gauge block (7); S3. Straightening: By manually operating the pull rod (8) and applying a load, the measuring rod (10) is pressed down to the fixed block (6) for straightening operation; S4. Calibration: Determine whether calibration is performed. If not, replace the gauge block (7) with a suitable size and repeat steps S2 and S3 until the straightness of the measuring rod (10) meets the calibration requirements.

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