Mechanism for calibrating concentricity of measuring head

Abstract

The invention discloses a mechanism for calibrating concentricity of a measuring head, which comprises an initial centering adjustment seat and a measuring head concentricity fine adjustment mechanism, and can ensure that the eccentricity between the center of a measuring ball of a measuring needle and the axis of a main shaft is within a smaller range during initial installation through the application of the calibrating mechanism, and the eccentricity of the measuring ball of the measuring needle and the axis of the main shaft is within a smaller range during repeated installation. Due to the small clearance fit between the coarse adjustment positioning column and the cutter handle, the repeated installation deviation is also within a small range, coarse adjustment is not needed, the fine adjustment process of the concentricity of the measuring needle is directly carried out, the concentricity adjustment efficiency of the measuring head is improved, the installation efficiency of the measuring head is further improved, and the installation cost is reduced. Different technicians can complete the calibration work of the concentricity of the measuring head in a short time, the mechanism protects the cylindrical clamping surface of the measuring head, the measuring head is not damaged in the adjusting process, parts corresponding to the adjusting contact surface can be replaced regularly, the measurement precision is ensured, and the maintenance cost of the measuring head is reduced.

Description

Technical Field

[0001] The invention belongs to the field of on-machine measuring and detecting devices for numerically controlled machine tools and relates to a mechanism for calibrating the concentricity of a probe, which is suitable for calibrating the concentricity of probe hardware. Background Art

[0002] The probe is one of the essential hardware for online detection of workpiece size and linear tolerance in the machine measurement system, and the probe concentricity is the premise to ensure the accuracy of the detection data. Different types of machine tools use different types of tool holders. During the installation of the probe, due to the structural characteristics of the probe itself, the deviation of the probe concentricity after the installation of the probe and the tool holder is relatively large. At this time, the program cannot be run directly to detect the workpiece, but the probe concentricity calibration is required. Generally, the probe concentricity is required to be within 0.002mm to ensure that the programmed point position coincides with the measured point position. During the concentricity calibration process of the existing fixed structure, when adjusting the concentricity of the probe ball center and the spindle, since the probe ball center deviates greatly from the spindle after installation, it is first roughly adjusted, and the flat end set screw position is repeatedly adjusted with a large stroke. When the deviation range becomes smaller, the flat end set screw position is repeatedly adjusted with a small stroke for fine adjustment, so that the deviation between the probe ball center and the spindle axis is within the required range. The adjustment process is time-consuming and laborious. Moreover, the top of the set screw is a round head, which can easily damage the cylindrical clamping surface of the probe. The calibration force and time also vary from person to person. Long-term use of the probe causes serious damage to the cylindrical clamping surface of the probe. It is difficult to calibrate the concentricity of the probe to the required range again, and the maximum service life of the probe has been reached. The probe needs to be returned to the factory for repair, increasing the probe repair cost. Summary of the invention

[0003] In view of the above existing practical problems, the present invention proposes a mechanism for calibrating the concentricity of a probe, which can ensure that after the probe and the spindle are installed, the deviation between the center of the probe ball and the axis of the spindle is within a small range, and only fine-tuning is required, and the adjustment process does not damage the probe itself.

[0004] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions: The present invention provides a mechanism for calibrating the concentricity of a probe, comprising: The initial centering adjustment seat 4 and the probe concentricity fine-tuning mechanism 2; the initial centering adjustment seat 4 is an installation tool, the central inner cavity is a cylindrical surface, the bottom end of the inner cavity is a plane, and the probe concentricity fine-tuning mechanism 2 is placed together above the probe 3 in the central inner cavity, so that the central axes of the two can be initially installed to coincide; the probe concentricity fine-tuning mechanism 2 is arranged above the probe 3 and below the probe tool holder 1, and is used for fine-tuning the concentricity of the probe.

[0005] Furthermore, the initial centering adjustment seat 4 is directly removed after determining that the central axis of the probe 3 and the probe concentricity fine-tuning mechanism 2 coincide with each other. It is only used in the initial installation and should not be used in the measurement process.

[0006] Furthermore, the probe concentricity fine-tuning mechanism 2 includes a coarse-adjusting positioning column 6, a fixed fine-tuning seat 9, a movable column 13, a tip set screw 7, a countersunk screw 8, a flat-end set screw 10, a front end ball head bolt 11, a compression spring 12, and a conical countersunk screw 14.

[0007] Furthermore, the movable column 13 is arranged in the inner cavity of the fixed fine-tuning seat 9, the protruding feature on the upper end of the probe 3 passes through the bottom center of the fixed fine-tuning seat 9, and the countersunk screw 8 passes through the movable column to fix the probe 3, the fixed fine-tuning seat 9, and the movable column 13 together.

[0008] Furthermore, compression springs 12 are evenly placed in the inner cavity of the fixed fine-tuning seat 9 and in the space in four directions of front, back, left and right of the movable column 13. Under the supporting force of the compression springs 12 and the action of the initial centering adjustment seat 4, the axis of the probe 3 coincides with the axis of the fixed fine-tuning seat 9.

[0009] Furthermore, under the premise that the axes of the probe 3 and the fixed fine-tuning seat 9 coincide, the front end ball stud 11 is screwed in the circumferential direction of the fixed fine-tuning seat 9 so that the front end ball stud 11 presses against the groove on the clamping surface of the moving column 13 .

[0010] Furthermore, the coarse adjustment positioning column 6 cooperates with the hole axis of the fixed fine adjustment seat 9 and is connected by a conical countersunk screw 14 to form an integral mechanism.

[0011] Furthermore, the whole mechanism is inserted into the inner hole of the probe shank 1, and the coarse adjustment positioning column 6 and the probe shank 1 are clearance-fitted, and the two can rotate. A tip locking screw 7 is installed circumferentially on the probe shank 1 to suspend the whole mechanism, and a flat-end locking screw 10 is installed circumferentially on the lower circumference to fix the whole mechanism to the probe shank 1.

[0012] Furthermore, it also includes a stylus 5. The stylus tool holder 1, the stylus concentricity fine-tuning mechanism 2, the stylus 3 and the stylus 5 are installed as a whole on the spindle of the CNC machine tool to carry out the next step of fine-tuning.

[0013] Compared with the prior art, the mechanism for calibrating the concentricity of the probe provided by the present invention has the following beneficial effects: Through the application of this calibration mechanism, the eccentricity between the center of the probe ball and the spindle axis can be ensured to be within a small range during the initial installation. During repeated installation, due to the small clearance between the coarse adjustment positioning column and the tool holder, the repeated installation deviation is also within a small range. No coarse adjustment is required, and the fine adjustment process of the probe concentricity can be directly entered, which improves the adjustment efficiency of the probe concentricity and thus improves the installation efficiency of the probe. Different process personnel can complete the calibration of the probe concentricity in a short time. The mechanism protects the cylindrical clamping surface of the probe and will not cause damage to the probe during the adjustment process. The parts corresponding to the adjustment contact surface can be replaced regularly, which ensures measurement accuracy and reduces the maintenance cost of the probe. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a side view of the overall structure of the probe concentricity calibration mechanism of the present invention; Figure 2 for Figure 1 A half-section view of the probe concentricity fine-tuning mechanism; Among them: 1. Probe handle, 2. Probe concentricity fine-tuning mechanism, 3. Probe, 4. Initial centering adjustment seat, 5. Probe, 6. Coarse adjustment positioning column, 7. Tip set screw, 8. Countersunk screw, 9. Fixed fine-tuning seat, 10. Flat end set screw, 11. Front end ball stud, 12. Compression spring, 13. Moving column, 14. Conical countersunk screw. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments. It should be understood that the embodiments described herein are only used to explain the present invention and are not intended to limit the scope of protection of the present invention. Example

[0016] The present invention is further described below in conjunction with the accompanying drawings: like Figure 1 , Figure 2 As shown, a mechanism for calibrating the concentricity of a probe includes: an initial centering adjustment seat 4 and a probe concentricity fine-tuning mechanism 2. The initial centering adjustment seat 4 is an installation tool, the central inner cavity is a cylindrical surface, and the bottom end of the inner cavity is a plane. The probe concentricity fine-tuning mechanism 2 is above the probe 3. The two are placed together in the central inner cavity, so that the central axes of the two can be initially installed to coincide; the probe concentricity fine-tuning mechanism 2 is arranged above the probe 3 and below the probe tool holder 1, and is used for fine-tuning the concentricity of the probe.

[0017] After determining that the central axis of the probe 3 and the probe concentricity fine-tuning mechanism 2 coincide, the initial centering adjustment seat 4 is directly removed and is only used in the initial installation stage and not in the measurement process. This can ensure that the coincidence deviation of the central axis of the probe 3 and the probe concentricity fine-tuning mechanism 2 is within the range of φ0.1mm.

[0018] The probe concentricity fine-tuning mechanism 2 includes a coarse-adjusting positioning column 6, a fixed fine-tuning seat 9, a movable column 13, a tip set screw 7, a countersunk screw 8, a flat-end set screw 10, a front end ball stud 11, a compression spring 12, and a conical countersunk screw 14.

[0019] The movable column 13 is square in shape and is arranged in the inner cavity of the fixed fine-tuning seat 9. The bottom end of the movable column 13 contacts the lower end surface of the inner cavity of the fixed fine-tuning seat 9. The protruding feature of the upper end of the probe 3 passes through the bottom center of the fixed fine-tuning seat 9. The countersunk screw 8 passes through the movable column 13 to fix the probe 3, the fixed fine-tuning seat 9 and the movable column 13 together. A measuring probe 5 is installed under the probe 3.

[0020] Compression springs 12 are evenly distributed in the inner cavity of the fixed fine-tuning seat 9 and in the space in four directions on the sides of the movable column 13. The compression springs 12 have consistent specifications. Under the supporting force of the compression springs 12 and the action of the initial centering adjustment seat 4, the axis of the probe 3 and the fixed fine-tuning seat 9 are basically aligned. At this time, the initial centering adjustment seat 4 is removed.

[0021] On the premise that the axis of the probe 3 and the fixed fine-tuning seat 9 are basically coincident, the internal threads are evenly distributed around the fixed fine-tuning seat 9, and the front end ball head bolt 11 is screwed in, so that the front end ball head bolt 11 is supported against the groove on the clamping surface of the moving column 13. At this time, the probe 3 is fixed relative to the fixed fine-tuning seat 9.

[0022] The coarse adjustment positioning column 6 cooperates with the hole axis of the fixed fine adjustment seat 9, and is connected and fixed by a conical countersunk screw 14, so that the connected parts are used as an integral mechanism.

[0023] Insert the above-mentioned overall mechanism into the inner hole of the probe tool handle 1. There is a clearance fit between the coarse adjustment positioning column 6 and the probe tool handle 1. The two can rotate. Two pointed end locking screws 7 are installed circumferentially on the upper side of the probe tool handle 1 to suspend the entire mechanism. Four flat-end locking screws 10 are installed circumferentially to fix the entire mechanism to the probe tool handle 1.

[0024] The probe shank 1, the probe concentricity fine-tuning mechanism 2, the probe 3 and the probe needle 5 are installed as a whole on the CNC machine tool spindle, and the next step of fine-tuning is carried out. The fine-tuning is mainly to complete the small deviation amount that exists after the probe concentricity fine-tuning mechanism 2 is installed.

[0025] Note: The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that any modification or partial replacement of the present invention without departing from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A mechanism for calibrating the concentricity of a probe, characterized in that: include: An initial centering adjustment seat (4) and a probe concentricity fine-tuning mechanism (2); the initial centering adjustment seat (4) is an installation tool, the central inner cavity is a cylindrical surface, the bottom end of the inner cavity is a flat surface, the probe concentricity fine-tuning mechanism (2) is placed above the probe (3) in the central inner cavity, so that the central axes of the two can be initially installed to coincide; the probe concentricity fine-tuning mechanism (2) is arranged above the probe (3) and below the probe tool holder (1) and is used for fine-tuning the concentricity of the probe.

2. The mechanism for calibrating the concentricity of a probe according to claim 1, characterized in that: The initial centering adjustment seat (4) is directly removed after confirming that the central axis of the probe (3) and the probe concentricity fine adjustment mechanism (2) coincide with each other. It is only used in the initial installation and should not be used during the measurement process.

3. The mechanism for calibrating the concentricity of a probe according to claim 1, characterized in that: The probe concentricity fine-adjustment mechanism (2) comprises a coarse adjustment positioning column (6), a fixed fine-adjustment seat (9), a movable column (13), a tip set screw (7), a countersunk screw (8), a flat end set screw (10), a front end ball head bolt (11), a compression spring (12), and a conical countersunk screw (14).

4. The mechanism for calibrating the concentricity of a probe according to claim 3, characterized in that: The movable column (13) is arranged in the inner cavity of the fixed fine-tuning seat (9), the protruding feature of the upper end of the probe (3) passes through the bottom center of the fixed fine-tuning seat (9), and the countersunk screw (8) passes through the movable column (13) to fix the probe (3), the fixed fine-tuning seat (9), and the movable column (13) together.

5. The mechanism for calibrating the concentricity of a probe according to claim 3, characterized in that: Compression springs (12) are evenly distributed in the inner cavity of the fixed fine-tuning seat (9) and in the space in the four directions of front, back, left, and right of the moving column (13). Under the support force of the compression springs (12) and the action of the initial centering adjustment seat (4), the axis of the probe (3) coincides with the axis of the fixed fine-tuning seat (9).

6. The mechanism for calibrating the concentricity of a probe according to claim 3, characterized in that: On the premise that the axes of the probe (3) and the fixed fine-tuning seat (9) coincide with each other, the front end ball stud (11) is screwed into the fixed fine-tuning seat (9) in the circumferential direction so that the front end ball stud (11) is pressed against the groove at the clamping surface of the moving column (13).

7. The mechanism for calibrating the concentricity of a probe according to claim 3, characterized in that: The coarse adjustment positioning column (6) cooperates with the hole axis of the fixed fine adjustment seat (9) and is connected by a conical countersunk screw (14) to form an integral mechanism.

8. The mechanism for calibrating the concentricity of a probe according to claim 7, characterized in that: The overall mechanism is inserted into the inner hole of the probe tool holder (1), the coarse adjustment positioning column (6) and the probe tool holder (1) are clearance-fitted and can rotate with each other, a tip set screw (7) is installed circumferentially on the upper side of the probe tool holder (1) to suspend the entire mechanism, and a flat end set screw (10) is installed circumferentially on the lower side to fix the entire mechanism to the probe tool holder (1).

9. The mechanism for calibrating the concentricity of a probe according to claim 1, characterized in that: It also includes a measuring needle (5), and the measuring head tool holder (1), the measuring head concentricity fine-tuning mechanism (2), the measuring head (3) and the measuring needle (5) are installed as a whole on the main shaft of the CNC machine tool to carry out the next step of fine-tuning.

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