Contour detection device and method for carrying out online detection through contour detection device

Abstract

A contour detection device disclosed by the present invention comprises a lathe bed, a processing device and a measurement device, the lathe bed comprises an X-direction sliding plate and a Z-direction sliding plate, the Z-direction sliding plate is provided with a workpiece main shaft capable of performing C-axis rotation, the measurement device is arranged on one side of the processing device, and the measurement device comprises a probe and a driving device capable of providing torque for the probe. The top of the probe is provided with the detection ball, and the driving device can drive the probe to rotate around the B2 axis, so that the thread contour and the pitch diameter of the internal thread can be detected through the measuring device, secondary clamping errors are avoided, and the subsequent machining precision and the production efficiency are further improved.

Description

Technical Field

[0001] The present invention belongs to the field of contour detection devices, and more specifically relates to a contour detection device and a method for performing online detection by using the device. Background Art

[0002] With the rapid development of the machinery industry, threaded parts such as screws and nuts have become key components. In order to meet the development needs of higher efficiency and higher precision, thread grinders, as key processing equipment, need to develop in the direction of intelligence and integration. Among them, how to measure the workpiece, feed back the measurement data to the machine tool and make timely adjustments has become a key link in the intelligence of thread grinders.

[0003] The commonly used method is to install a probe on the thread grinder, but this probe can only be used for workpiece tool setting and cannot measure geometric parameters such as the workpiece profile and diameter. If you want to measure these data, you need to disassemble the workpiece after processing, put it on a measuring device such as a profilometer for measurement, reinstall the workpiece on the machine tool after the measurement is completed, and finally make processing adjustments based on the measured data. However, this method will cause secondary clamping errors, and requires manual operation, and cannot achieve automatic measurement. Summary of the invention

[0004] The main purpose of the present invention is to provide a contour detection device and a method for online detection using the device, which can detect the thread contour and the inner thread middle diameter respectively, avoid secondary clamping errors and improve processing accuracy.

[0005] To achieve the above object, the technical solution of the present invention is:

[0006] A contour detection device includes a bed, a processing device and a measuring device. The bed includes an X-axis slide and a Z-axis slide. The Z-axis slide is provided with a workpiece spindle that can rotate along a C-axis. The X-axis slide is provided with a processing device. The measuring device is arranged on one side of the processing device. The measuring device can be used to detect the thread profile and the middle diameter of the internal thread respectively. The measuring device includes a probe and a driving device that can provide torque to the probe. A detection ball is provided on the top of the probe. The driving device can drive the probe to rotate around the B2 axis.

[0007] In a specific embodiment of the present invention, the measuring device further comprises two correspondingly arranged tops.

[0008] In a specific embodiment of the present invention, the processing device includes a column and a first processing axis and a second processing axis that can respectively perform swing angle processing.

[0009] In a specific embodiment of the present invention, the columns are respectively provided with a first driving assembly and a second driving assembly, and the first processing axis and the second processing axis can be automatically swung by the first driving assembly and the second driving assembly respectively.

[0010] In a specific embodiment of the present invention, the bed further includes a first transmission mechanism and a second transmission mechanism for driving the X-direction slide and the Z-direction slide.

[0011] In a specific embodiment of the present invention, a dresser device is provided on the side of the workpiece spindle.

[0012] In a specific embodiment of the present invention, when detecting the thread profile, the following detection method is included:

[0013] 1) The driving device is placed in a torque control state so that the detection ball is always in contact with the workpiece;

[0014] 2) The workpiece is driven to reciprocate by the Z-direction slide, so that the probe and the workpiece are relatively displaced, and the displacement of the workpiece in the Z direction is recorded as δ;

[0015] 3) The angles α1 and α2 between the axis of the workpiece axis and the line connecting the center of the detection ball and the rotation center are detected by the circular encoder signal of the B2 axis before and after the completion of step 2);

[0016] 4) The distance from the center of the detection ball to the rotation center of the B2 axis is recorded as D, and the displacement distance of the detection ball in the Z direction and the X direction before and after the completion of step 2) can be obtained, which are recorded as ΔZ1 and ΔX1 respectively;

[0017] 5) Draw the workpiece contour according to the variation curves of ΔX1 and ΔZ1, the diameter d of the detection ball, and the workpiece displacement δ.

[0018] In a specific embodiment of the present invention, when detecting the middle diameter of the internal thread, the following detection method is included:

[0019] 1) The distance between the two ends of the probe is recorded as L, and the driving device is adjusted to be in a torque control state so that the detection ball can contact the workpiece;

[0020] 2) Adjust the installation position of the probe so that the center of the probe and the rotation center of the workpiece are at the same height;

[0021] 3) The probe is driven to reciprocate by the X-axis slide. When the probe contacts the inner wall of the front side of the workpiece, the X-axis slide stops moving and records the current position of the X-axis;

[0022] 4) Move the X-axis slide in the opposite direction to drive the probe to contact the rear inner wall of the workpiece, and record the position of the X-axis at this time to obtain the difference ΔX2 between the two positions. The inner diameter of the internal thread to be detected can be calculated to be L+ΔX2.

[0023] One of the above technical solutions of the present invention has at least one of the following advantages or beneficial effects:

[0024] The present invention arranges a workpiece spindle capable of C-axis rotation on a Z-axis slide, and arranges a measuring device on one side of a processing device. The thread profile and the inner thread center diameter are respectively detected by the measuring device, thereby avoiding secondary clamping errors and further improving subsequent processing accuracy and production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments;

[0026] Attached Figure 1 is an overall structural diagram of an embodiment of the present invention;

[0027] Attached Figure 2 It is a structural diagram of another perspective of an embodiment of the present invention;

[0028] Attached Figure 3 A schematic diagram of thread profile measurement according to an embodiment of the present invention;

[0029] Attached Figure 4 The internal thread diameter measurement principle of one embodiment of the present invention Figure 1 ;

[0030] Attached Figure 5 The internal thread diameter measurement principle of one embodiment of the present invention Figure 2 ;

[0031] Attached Figure 6 A schematic diagram of a measuring device according to an embodiment of the present invention;

[0032] Attached Figure 7 A second layout diagram of an embodiment of the present invention;

[0033] Attached Figure 8 This is a third layout diagram of an embodiment of the present invention. DETAILED DESCRIPTION

[0034] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0035] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0036] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection or a movable connection, a detachable connection or a non-detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be internal connection between two elements, indirect connection, or an interactive relationship between two elements.

[0039] The following disclosure provides many different embodiments or examples for implementing different solutions of the present invention.

[0040] See attached Figure 1 To Attachment Figure 8 As shown, a contour detection device and a method for online detection using the device, wherein the contour detection device includes a bed 1, a processing device 2 and a measuring device 3, the bed 1 includes an X-axis slide 11, a Z-axis slide 12 and a first transmission mechanism and a second transmission mechanism for driving the X-axis slide 11 and the Z-axis slide 12.

[0041] In one embodiment of the present invention, a workpiece spindle 4 capable of C-axis rotation is provided on the Z-axis slide 12. The workpiece spindle 4 adopts an electric spindle and uses a cooler to force constant temperature cooling to ensure stable operation and high precision. A turntable 5 capable of rotating around the B1 axis is provided on the X-axis slide 11, and the processing device 2 is located on the turntable 5.

[0042] In one embodiment of the present invention, the processing device 2 includes a column and a first processing axis 21 and a second processing axis 22 that can respectively perform swing angle processing. The first processing axis 21 and the second processing axis 22 can perform station rotation operations through a turntable 5.

[0043] In one embodiment of the present invention, a first driving assembly and a second driving assembly are respectively provided on the column, and the first processing axis 21 and the second processing axis 22 can automatically swing under the action of the first driving assembly and the second driving assembly respectively.

[0044] In one embodiment of the present invention, a measuring device 3 is disposed on one side of the processing device 2. The measuring device 3 can be used to detect the thread profile and the inner thread center diameter respectively. The measuring device 3 includes a probe 31 and a driving device 32 that can provide torque to the probe 31. The driving device 32 can drive the probe 31 to rotate around the B2 axis. The driving device 32 is a servo motor. The measuring device 3 uses a structure in which the top 33 is fixed at both ends to replace the bearing, thereby making it easier to achieve high rotation accuracy.

[0045] In one embodiment of the present invention, a dresser device 6 is provided on the side of the workpiece spindle 4. The dresser device 6 can be used according to actual production needs. After a period of grinding, when the grinding wheel is deformed or blunted, particles will appear on the surface of the grinding wheel. At this time, the dresser device 6 can be used to grind the grinding wheel.

[0046] In one embodiment of the present invention, when detecting the thread profile (see attached Figure 3 ), including the following detection steps:

[0047] The first step is to put the driving device 32 in a torque control state, so that the B2 axis becomes a follower axis. Since a torque is applied to the probe 31 from the outside, the detection ball can always be in contact with the workpiece;

[0048] In the second step, the Z-direction slide 12 drives the workpiece to reciprocate, so that the probe 31 and the workpiece are relatively displaced, and the displacement of the workpiece in the Z direction is recorded as δ;

[0049] In the third step, the angles α1 and α2 between the axis of the workpiece and the line connecting the center of the detection ball and the rotation center before and after the completion of step 2) are detected by the circular encoder signal of the B2 axis;

[0050] In the fourth step, the distance from the center of the probe ball to the rotation center of the B2 axis is recorded as D, and the displacement distance of the probe ball in the Z direction and the X direction before and after the completion of step 2) can be obtained, which are recorded as ΔZ1 and ΔX1 respectively;

[0051] The fifth step is to draw the workpiece contour according to the change curves of ΔX1 and ΔZ1, the diameter d of the detection ball, and the workpiece displacement δ. The measured contour line is a continuous contour line. Compared with the common multi-point measurement method, the measurement result is more accurate.

[0052] In one embodiment of the present invention, when detecting the pitch diameter of the internal thread (refer to the attached Figure 4 , Attachment Figure 5 ), including the following detection steps:

[0053] In the first step, the distance between the two ends of the probe 31 is recorded as L, and the driving device 32 is adjusted to be in a torque control state so that the detection ball can contact the workpiece;

[0054] The second step is to adjust the installation position of the probe 31 so that the center of the probe 31 and the rotation center of the workpiece are at the same height;

[0055] In the third step, the probe 31 is driven to reciprocate by the X-axis slide 11. When the probe 31 contacts the inner wall of the front side of the workpiece, the X-axis slide 11 stops moving and records the current position of the X-axis.

[0056] The fourth step is to make the X-axis slide 11 move in the opposite direction, drive the probe 31 to contact the rear inner wall of the workpiece, and record the X-axis position at this time to obtain the difference ΔX2 between the two positions. The inner diameter of the internal thread to be detected can be calculated to be L+ΔX2.

[0057] In one embodiment of the present invention, referring to the attached Figure 7 The grating rulers used in both the X and Z axes can be used as position feedback, and the measuring device 3 can be installed on the Z-axis slide 12. When the workpiece moves back and forth in the X-axis direction, the measuring device 3 can produce relative displacement with the workpiece.

[0058] In one embodiment of the present invention, the measuring device 3 can also be arranged on a machine tool without a turntable. Figure 8 An X-axis slide 11 and a Z-axis slide 12 are arranged on the bed 1. The grinding wheel spindle moves forward and backward on the X-axis slide 11, and the workpiece can move left and right on the Z-axis slide 12. The grating rulers used in both the X and Z axes are used for position feedback. The measuring device 3 is installed on the X-axis slide 11, and the measuring device 3 also has a swing angle device B3 axis to avoid spatial interference during processing.

[0059] When in the processing state, the swing arm is swung upward to avoid interference between the workpiece and the measuring device 3. When in the measuring state, the swing arm is lowered to make the measuring device 3 in a horizontal state. When the workpiece moves back and forth with the Z-direction slide 12, the measuring device 3 can generate relative displacement with the workpiece.

[0060] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A contour detection device, characterized in that: The invention comprises a bed (1), a processing device (2) and a measuring device (3), wherein the bed (1) comprises an X-axis slide (11) and a Z-axis slide (12), wherein the Z-axis slide (12) is provided with a workpiece spindle (4) capable of C-axis rotation, and the X-axis slide (11) is provided with a processing device (2). The measuring device (3) is arranged on one side of the processing device (2), and the measuring device (3) can be used to detect a thread profile and an internal thread mid-diameter respectively. The measuring device (3) comprises a probe (31) and a driving device (32) capable of providing torque to the probe (31), wherein a detection ball is provided on the top of the probe (31), and the driving device (32) can drive the probe (31) to rotate around a B2 axis.

2. The contour detection device according to claim 1, characterized in that: The measuring device (3) also includes two correspondingly arranged top points (33).

3. The contour detection device according to claim 1, characterized in that: The processing device (2) comprises a column and a first processing axis (21) and a second processing axis (22) which can respectively perform swing angle processing.

4. The contour detection device according to claim 3, characterized in that: The columns are respectively provided with a first drive assembly and a second drive assembly, and the first processing axis (21) and the second processing axis (22) can be automatically swung under the action of the first drive assembly and the second drive assembly respectively.

5. The contour detection device according to claim 1, characterized in that: The bed (1) also includes a first transmission mechanism and a second transmission mechanism for driving the X-direction slide (11) and the Z-direction slide (12).

6. The contour detection device according to claim 1, characterized in that: A dresser device (6) is provided on the side of the workpiece spindle (4).

7. A method for online detection using the contour detection device according to claim 1, characterized in that: When detecting the thread profile, the following detection steps are included: 1) placing the driving device (32) in a torque control state so that the detection ball is always in contact with the workpiece; 2) The workpiece is driven to reciprocate by the Z-direction slide (12), so that the probe (31) and the workpiece are relatively displaced, and the displacement of the workpiece in the Z direction is recorded as δ; 3) The angles α1 and α2 between the axis of the workpiece axis and the line connecting the center of the detection ball and the rotation center are detected by the circular encoder signal of the B2 axis before and after the completion of step 2); 4) The distance from the center of the detection ball to the rotation center of the B2 axis is recorded as D, and the displacement distance of the detection ball in the Z direction and the X direction before and after the completion of step 2) can be obtained, which are recorded as ΔZ1 and ΔX1 respectively; 5) Draw the workpiece contour according to the variation curves of ΔX1 and ΔZ1, the diameter d of the detection ball, and the workpiece displacement δ.

8. A method for online detection using the contour detection device according to claim 1, characterized in that: When testing the internal thread pitch diameter, the following testing steps are included: 1) The distance between the two ends of the probe (31) is recorded as L, and the driving device (32) is adjusted to be in a torque control state so that the detection ball can contact the workpiece; 2) adjusting the installation position of the probe (31) so that the center of the probe (31) and the rotation center of the workpiece are at the same height; 3) The probe (31) is driven to reciprocate by the X-axis slide (11); when the probe (31) contacts the inner wall of the front side of the workpiece, the X-axis slide (11) stops moving and records the current position of the X-axis; 4) The X-axis slide (11) is moved in the reverse direction to drive the probe (31) to contact the rear inner wall of the workpiece, and the position of the X-axis at this time is recorded to obtain the difference ΔX2 between the two positions. The inner diameter of the internal thread to be detected can be calculated to be L+ΔX2.

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