A device and method for detecting the offset of a turntable brake

Abstract

This invention relates to the field of machine tool testing technology, and provides a rotary table brake offset detection device and method. The rotary table brake offset detection device includes: a base, a top seat, a connecting rod, and a standard ball. The base is used for mounting on the rotary table, the first end of the top seat is connected to the base, and the second end of the top seat has a first mounting surface. One end of the connecting rod is connected to the standard ball, and the other end of the connecting rod is connected to the first mounting surface and is perpendicular to the first mounting surface. The rotary table brake offset detection device of this invention is easy to operate, has high testing efficiency, and provides accurate test results.

Description

Technical Field

[0001] This invention relates to the field of machine tool testing technology, and in particular to a rotary table brake offset detection device and detection method. Background Technology

[0002] A rotary table is an important machine tool accessory that provides the machine tool with rotational coordinates. Driven by the fourth or fifth axis, the rotary table performs equal, non-equal, or continuous rotary machining, enabling the machining of complex curved surfaces. In four- or five-axis rotary tables, a brake assembly is often used to brake and release the rotary table. Rotary table brake offset detection is a crucial indicator of the rotary table brake positioning accuracy. Only machine tools with small rotary table brake offsets can achieve improved machining accuracy and stability when high-precision positioning with the rotary table brake is required at the machine tool end. Therefore, multi-axis CNC machine tools with rotary tables equipped with brake functions require rigorous testing after assembly to ensure the accuracy of the test results.

[0003] Currently, the main method for detecting turntable brake offset is to manually measure the offset using a mechanical dial indicator mounted on the turntable, and then record the readings. This process requires repeated manual adjustments and recording, demanding a high level of skill from the operators, and is complex, inefficient, and yields inaccurate results. Summary of the Invention

[0004] This invention provides a turntable brake offset detection device and method to solve the problems of complex operation, low efficiency and inaccurate results in the detection of turntable brake offset in the prior art.

[0005] To solve the above-mentioned technical problems, the present invention is implemented as follows:

[0006] In a first aspect, the present invention provides a turntable brake offset detection device, comprising: a base, a top seat, a connecting rod, and a standard ball;

[0007] The base is used to be mounted on the turntable, the first end of the top seat is connected to the base, and the second end of the top seat has a first mounting surface;

[0008] One end of the connecting rod is connected to the standard ball, and the other end of the connecting rod is connected to the first mounting surface and is set perpendicular to the first mounting surface.

[0009] According to the present invention, a turntable brake offset detection device is provided, wherein the second end of the top seat further has a second mounting surface;

[0010] The first mounting surface and the second mounting surface are connected at an angle;

[0011] The other end of the connecting rod can be selectively connected to either the first mounting surface or the second mounting surface.

[0012] According to the present invention, a turntable brake offset detection device is provided, wherein the included angle between the first mounting surface and the second mounting surface is 135 degrees.

[0013] According to the present invention, a turntable brake offset detection device is provided, wherein the base and the top seat are connected by an adapter.

[0014] The adapter is provided in multiple units, and the multiple adapters have different height specifications.

[0015] According to the present invention, a turntable brake offset detection device is provided, wherein the base is provided with U-shaped holes at both ends;

[0016] The U-shaped hole extends along the length of the base, and a stepped groove is provided in the wall of the U-shaped hole.

[0017] Secondly, the present invention provides a detection method based on the turntable brake offset detection device described above, comprising:

[0018] Obtain the coordinates of the first center of the standard sphere when the turntable brake is in its first state;

[0019] Obtain the coordinates of the second center of the standard sphere when the turntable brake is in its second state;

[0020] Calculate the center offset of the standard sphere based on the coordinates of the first and second sphere centers.

[0021] According to the detection method provided by the present invention, in the case of detecting brake offset of a separate fourth-axis turntable, the method further includes:

[0022] Adjust the angle of the connecting rod to ensure that the maximum diameter of the standard ball does not interfere with the projection of the connecting rod in the horizontal plane.

[0023] According to a detection method provided by the present invention, in the case of brake offset detection of a cantilevered combined turntable, obtaining the second center coordinates of a standard sphere of the turntable brake in the second state includes:

[0024] Obtain the different values ​​of the second center coordinates of the standard spheres when the fourth axis B-axis turntable brake and the fifth axis C-axis turntable brake are in the clamped or released states, respectively.

[0025] Specifically, the fourth axis B-axis turntable is tested at 0 degrees, +90 degrees, and -90 degrees respectively, and when the fourth axis B-axis turntable is at 0 degrees, the fifth axis C-axis turntable is tested at 90-degree intervals.

[0026] According to a detection method provided by the present invention, in the case of detecting the offset of the combined brake of a cradle-type combined turntable, obtaining the second center coordinates of the standard sphere of the turntable brake in the second state includes:

[0027] Obtain the different values ​​of the second sphere center coordinates when the fourth axis A-axis turntable brake is in the clamped or released state, and when the fifth axis is in the clamped or released state;

[0028] Specifically, the fourth axis A-axis turntable is tested at 0 degrees, +90 degrees, and -90 degrees respectively, and when the fourth axis A-axis turntable is at 0 degrees, the fifth axis C-axis turntable is tested at 90-degree intervals.

[0029] According to a detection method provided by the present invention, the step of obtaining the first center coordinates of a standard sphere when the turntable brake is in a first state includes:

[0030] Get the Z coordinate of the sphere's center;

[0031] Based on the Z-coordinate of the sphere's center, obtain the maximum diameter cross-section circle of the standard sphere;

[0032] Multiple uniformly distributed measurement points are obtained based on the circle with the largest diameter cross section, and the XY coordinates of the multiple measurement points are obtained. The XY coordinates of the center of the sphere are then calculated.

[0033] The turntable brake offset detection device and method provided by this invention, by setting up a base, a top seat, a connecting rod and a standard ball, connects one end of the connecting rod to the standard ball and installs the other end vertically on the first mounting surface of the top seat, so that the center coordinates of the standard ball can be detected in different states of the turntable brake being clamped and released. By comparing the center coordinates of the ball in different states, the offset after the turntable brake state is switched can be calculated, thereby determining the positioning accuracy of the turntable brake. Compared with manual measurement and reading recording, the turntable brake offset detection device of this embodiment is simple to operate, has high detection efficiency, and accurate detection results. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0035] Figure 1 This is one of the three-dimensional structural schematic diagrams of the turntable brake offset detection device provided by the present invention.

[0036] Figure 2 This is the second three-dimensional structural schematic diagram of the turntable brake offset detection device provided by the present invention.

[0037] Figure 3 This is a three-dimensional structural diagram of the base provided by the present invention.

[0038] Figure 4 This is a three-dimensional structural diagram of the top seat provided by the present invention.

[0039] Figure 5 This is a three-dimensional structural diagram of the connecting rod and standard ball provided by the present invention.

[0040] Figure 6 This is a three-dimensional structural diagram of the adapter provided by the present invention.

[0041] Figure 7 This is a schematic diagram of the turntable brake offset detection device provided by the present invention installed on a separate fourth axis A-axis turntable.

[0042] Figure 8 This is a schematic diagram of the turntable brake offset detection device provided by the present invention installed on a separate fourth axis B-axis turntable.

[0043] Figure 9 This is one of the schematic diagrams of the turntable brake offset detection device provided by the present invention installed on the fifth axis C-axis turntable of a cantilevered combined turntable.

[0044] Figure 10 This is the second schematic diagram of the turntable brake offset detection device provided by the present invention installed on the fifth axis C-axis turntable of the cantilever combined turntable.

[0045] Figure 11 This is one of the schematic diagrams of the turntable brake offset detection device provided by the present invention installed on the fifth axis C-axis turntable of the cradle-type combined turntable.

[0046] Figure 12 This is the second schematic diagram of the turntable brake offset detection device provided by the present invention installed on the fifth axis C-axis turntable of the cradle-type combined turntable.

[0047] Figure 13 This is a schematic diagram of the turntable brake offset detection device provided by the present invention projected onto the XOZ plane.

[0048] Figure 14 This is a schematic diagram of the turntable brake offset detection device provided by the present invention projected onto the XOY plane.

[0049] Figure 15 This is a flowchart illustrating the detection method based on the turntable brake offset detection device provided by the present invention.

[0050] Figure 16 This is a schematic diagram of the process for detecting brake offset on a separate fourth-axis turntable provided by the present invention.

[0051] Figure 17 This is a schematic diagram of the process for detecting brake offset of a cantilevered combined turntable provided by the present invention.

[0052] Figure 18 This is a schematic diagram of the process for detecting the offset of the combined brake on a cradle-type combined turntable provided by the present invention.

[0053] Figure 19 This is a flowchart illustrating the process of obtaining the first center coordinates of a standard ball in the first state of a turntable brake, as provided by the present invention.

[0054] Figure 20 This is a schematic diagram of obtaining eight measurement points on the maximum diameter cross-sectional circle of a standard sphere in a vertical position, as provided by the present invention.

[0055] Figure 21 This is a schematic diagram of obtaining eight measurement points on the maximum diameter cross-sectional circle of a standard sphere when it is tilted, as provided by the present invention.

[0056] Figure label:

[0057] 1. Turntable brake offset detection device;

[0058] 11. Base; 12. Top mount; 13. Connecting rod; 14. Standard ball; 15. Adapter; 111. U-shaped hole; 121. First mounting surface; 122. Second mounting surface;

[0059] 2. Fourth axis A-axis turntable; 3. Fourth axis B-axis turntable; 4. Cantilever type fifth axis C-axis turntable; 5. Cradle type fifth axis C-axis turntable. Detailed Implementation

[0060] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0061] The following is combined with Figures 1 to 21 The present invention will provide a detailed description of the turntable brake offset detection device and detection method provided in the embodiments of the present invention through specific implementation methods and application scenarios.

[0062] Firstly, such as Figure 1 and Figure 2 As shown, this embodiment provides a turntable brake offset detection device 1, including: a base 11, a top seat 12, a connecting rod 13 and a standard ball 14.

[0063] like Figure 3 and Figure 4 As shown, the base 11 is used to be mounted on the turntable, the first end of the top seat 12 is connected to the base 11, and the second end of the top seat 12 has a first mounting surface 121.

[0064] like Figure 5 As shown, one end of the connecting rod 13 is connected to the standard ball 14, and the other end of the connecting rod 13 is connected to the first mounting surface 121 and is set perpendicular to the first mounting surface 121.

[0065] The rotary table brake offset detection device 1 in this example can be used on machine tools equipped with a separate fourth axis, as well as machine tools equipped with cradle-type or cantilever-type combined rotary tables. The detection device can measure the center coordinates of the standard ball 14 in both the clamped and released states of the rotary table brake. By comparing the different center coordinates of the ball in the clamped and released states, the device can determine the offset of the rotary table brake after clamping, and thus determine the positioning error of the rotary table brake in different clamped and released states.

[0066] The base 11 in this embodiment is used for mounting on a turntable and serves as a mounting support. Specifically, the base 11 in this embodiment can be fixed on either the fourth-axis turntable or the fifth-axis turntable. The fourth-axis turntable includes an A-axis turntable and a B-axis turntable, and the fifth-axis turntable is a C-axis turntable.

[0067] In this embodiment, the top seat 12 provides a first mounting surface 121 for the connecting rod 13 and the standard ball 14, with the connecting rod 13 perpendicular to the top seat 12. A detector is installed on the upper side of the turntable to detect the standard ball 14 and calculate its center coordinates. The detector acquires the center coordinates of the standard ball 14 under different states of the turntable's brake clamping and releasing, so as to calculate the offset of the standard ball 14's center coordinates when switching the clamping state of the turntable's brake.

[0068] Specifically, in this embodiment, both the base 11 and the top seat 12 are provided with mounting holes, and the base 11 and the top seat 12 are connected by a pin or bolt. The first mounting surface 121 of the top seat 12 is also provided with mounting holes, and one end of the connecting rod 13 can be inserted into the mounting hole of the top seat 12 for stable insertion and connection with the top seat 12.

[0069] The turntable brake offset detection device 1 provided by the present invention, by setting a base 11, a top seat 12, a connecting rod 13 and a standard ball 14, connects one end of the connecting rod 13 to the standard ball 14 and installs the other end vertically on the first mounting surface 121 of the top seat 12, so that the center coordinates of the standard ball 14 can be detected in different states of the turntable brake being clamped and released. By comparing the center coordinates of the ball in different states, the offset after the turntable brake state is switched can be calculated, thereby determining the positioning accuracy of the turntable brake. Compared with manual measurement and reading recording, the turntable brake offset detection device 1 of this embodiment is simple to operate, has high detection efficiency, and accurate detection results.

[0070] In some embodiments, such as Figure 4 As shown, the second end of the top seat 12 in this embodiment also has a second mounting surface 122.

[0071] The first mounting surface 121 and the second mounting surface 122 are connected at an angle.

[0072] The other end of the connecting rod 13 can be selectively connected to either the first mounting surface 121 or the second mounting surface 122.

[0073] In this embodiment, the first mounting surface 121 is arranged parallel to the bottom wall of the top seat 12, and the second mounting surface 122 is arranged at an angle to the bottom wall of the top seat 12.

[0074] In this embodiment, the offset of the turntable brake is mainly obtained by comparing the offset of the center coordinates of the standard sphere 14. To obtain the center coordinates of the standard sphere 14, a detector is first used to obtain the coordinates of points on the sphere wall, and then the center coordinates are obtained through numerical fitting. Since the detector is usually installed on the upper side of the turntable, when obtaining the maximum diameter cross-sectional circle by projecting the detector onto the horizontal plane, the maximum diameter circumference of the standard sphere 14 must not interfere with the standard rod within a 360-degree range. This is to prevent the obtained geometric features of the standard sphere 14 from containing the characteristic information of the standard rod, thus affecting the accuracy of the center coordinates of the standard sphere 14.

[0075] Therefore, in this embodiment, a second mounting surface 122 is also provided on the top seat 12. When the connecting rod 13 is installed on the first mounting surface 121 or the second mounting surface 122, the connecting rod 13 is set perpendicular to the first mounting surface 121 or the second mounting surface 122. When the connecting rod 13 is installed on the first mounting surface 121, and its projection on the horizontal plane interferes with the connecting rod 13, the connecting rod 13 can be adjusted to the second mounting surface 122. Based on the inclined arrangement of the first mounting surface 121 and the second mounting surface 122, it is possible to adjust the connecting rod 13 and the standard ball 14 to be located on the second mounting surface 122, so that the projection of the standard ball 14 on the horizontal plane does not interfere with the connecting rod 13, thereby ensuring the correct acquisition of the center coordinates of the standard ball 14.

[0076] In some embodiments, such as Figure 4 As shown, the included angle between the first mounting surface 121 and the second mounting surface 122 in this embodiment is 135 degrees.

[0077] When the angle between the first mounting surface 121 and the second mounting surface 122 is 135 degrees, since the first mounting surface 121 is parallel to the bottom wall of the top seat 12, the angle between the second mounting surface 122 and the bottom wall of the top seat 12 is 45 degrees.

[0078] Since the turntable requires shaft calibration, the second mounting surface 122 can also be used to mount shaft calibration tools. The top seat 12 can serve as a tooling for the turntable brake detection device and also as a tooling for shaft detection, thus expanding the application scenarios of the top seat 12 and simplifying the types of tooling.

[0079] like Figure 6 As shown, in this embodiment, the base 11 and the top seat 12 are connected by an adapter 15.

[0080] Multiple adapters 15 are provided, and the multiple adapters 15 have different height specifications.

[0081] As a transition section between the top seat 12 and the base 11, the length of the detection device can be adjusted by increasing or decreasing the number of multiple adapter seats 15 to accommodate the detection of the turntable brake of different machine tool models.

[0082] Specifically, the adapter 15 is cylindrical and has multiple mounting holes, which can ensure quick installation and removal of the adapter 15 from the base 11, the top seat 12, and multiple adapters 15.

[0083] In some embodiments, such as Figure 3 As shown, the base 11 in this embodiment has U-shaped holes 111 at both ends.

[0084] The U-shaped hole 111 extends along the length of the base 11, and the wall of the U-shaped hole 111 is provided with a stepped groove.

[0085] The U-shaped hole 111 of the base 11 is used to connect with the turntable, and the U-shaped hole 111 is fixed to the turntable using a pin or bolt. Since the U-shaped hole 111 extends along the length of the base 11, the slight displacement of the base 11 and the turntable can be adjusted by adjusting the position of the pin or bolt within the U-shaped hole 111. The stepped groove in the hole wall of the U-shaped hole 111 is used for the shaft part of the pin or the thread of the bolt to pass through, and restricts the pin part of the pin or the thread head of the bolt to be located within the U-shaped hole 111, thereby achieving the fixation of the pin or bolt.

[0086] Secondly, such as Figure 15 As shown, this embodiment provides a detection method for the turntable brake offset detection device 1 as described above, including the following steps:

[0087] Step 1511: Obtain the first center coordinates of the standard ball 14 when the turntable brake is in the first state.

[0088] Step 1512: Obtain the second center coordinates of the standard ball 14 when the turntable brake is in the second state.

[0089] Step 1513: Calculate the center offset of the standard sphere 14 based on the coordinates of the first and second sphere centers.

[0090] In this embodiment, when performing offset detection on the turntable brake, the detection device is first installed on the turntable, and then the turntable is driven to rotate. A position is selected that is convenient for collecting coordinates of the sphere wall of the standard sphere 14. The coordinates of the first sphere center of the turntable brake in the first state and the coordinates of the second sphere center in the second state are obtained. The offset of the first sphere center coordinates and the second sphere center coordinates is calculated to complete the detection of the offset of the turntable brake.

[0091] The first state of the turntable brake refers to the state when the measured turntable brake is in the released state. If it is a combined turntable brake test, it is also when all turntable brakes are in the released state, that is, the first sphere center coordinate is the sphere center coordinate of the turntable brake in the initial state.

[0092] When the turntable brake is in the second state, it means that the turntable brake being measured is in a clamped state. If it is a combined turntable brake test, it can be in a state where some turntable brakes are clamped, some turntable brakes are loosened, or all turntable brakes are clamped.

[0093] Meanwhile, if it is necessary to detect the offset of the turntable brake at different rotation angles, the turntable must first be rotated to the target angle. At this time, the first sphere center coordinate refers to the sphere center coordinate in the handling state where the turntable brake is released, and the second sphere center coordinate includes the sphere center coordinate after the state of the turntable brake is adjusted.

[0094] Specifically, in this embodiment, a detector is used to detect and acquire multiple coordinates of the wall of the standard sphere 14, and the coordinates of the center of the standard sphere 14 are calculated by numerical fitting, thereby realizing the conversion from the coordinates of the wall of the standard sphere 14 to the coordinates of the center of the sphere.

[0095] After obtaining the coordinates of the first and second sphere centers, the differences between the first and second sphere center coordinates in the XYZ directions are calculated to obtain the offset of the turntable brake in the XYZ directions.

[0096] The detection method in this embodiment only requires installing the detection device on the turntable. The first ball center coordinates are obtained in the first state of the turntable brake, and the second ball center coordinates are obtained in the second state of the turntable brake. By collecting the first and second ball center coordinates and calculating the offset, the offset of the turntable brake can be obtained. The entire detection only requires installing the detection device once, avoiding the tedious workload of manually adjusting the fixture to find the appropriate position. Moreover, the ball center coordinates are automatically calculated after being acquired by the detector, which also avoids a lot of manual calculation work, thus improving the efficiency and accuracy of the detection.

[0097] like Figure 7 , Figure 8 and Figure 16As shown, in the case of detecting brake offset on a separate fourth-axis turntable in this embodiment, the following steps are also included:

[0098] Step 1611: Adjust the angle of the connecting rod 13 to ensure that the maximum diameter of the standard ball 14 does not interfere with the projection of the connecting rod 13 in the horizontal plane.

[0099] like Figure 13 and Figure 14 As shown, after the detection device is installed on the turntable, for the fourth axis A-axis turntable 2, the turntable is rotated so that the connecting rod 13 and the standard ball 14 are parallel to the XOZ plane, and the offset direction of the connecting rod 13 is tilted upward. At this time, the maximum diameter of the standard ball 14 does not interfere with the projection of the connecting rod 13 in the horizontal plane, which is more conducive to obtaining the ball wall coordinates of the standard ball 14.

[0100] For the fourth axis B-axis turntable 3, rotating the turntable makes the connecting rod 13 and the standard ball 14 parallel to the YOZ plane, and the offset direction of the connecting rod 13 tilts upward. At this time, the maximum diameter of the standard ball 14 does not interfere with the projection of the connecting rod 13 in the horizontal plane, which is more conducive to obtaining the ball wall coordinates of the standard ball 14.

[0101] It should be noted that the projection of the standard ball 14 is vertically downward. Only when the standard ball 14 is positioned vertically upward relative to the connecting rod 13 will the connecting rod 13 not interfere with the projection of the standard ball 14. Therefore, when performing brake offset detection on a separate fourth-axis turntable, the connecting rod 13 and the standard ball 14 are typically mounted on the second mounting surface 122 of the top seat 12, with the standard rod and top seat 12 mounted at an axial angle, and the standard ball 14 positioned diagonally upward relative to the connecting rod 13. This ensures that the connecting rod 13 does not interfere with the projection of the maximum diameter of the standard ball 14 onto the horizontal plane, guaranteeing the accuracy of obtaining the center coordinates of the standard ball 14.

[0102] like Figure 9 , Figure 10 and Figure 17 As shown, in this embodiment, when performing brake offset detection on a cantilevered combined turntable, obtaining the second center coordinates of the standard sphere 14 when the turntable brake is in the second state includes the following steps:

[0103] Step 1711: Obtain the different values ​​of the second center coordinates of the standard ball 14 when the brakes of the fourth axis B-axis turntable 3 and the fifth axis C-axis turntable are in the clamped or released states, respectively.

[0104] Specifically, the fourth axis B-axis turntable 3 is tested at 0 degrees, +90 degrees and -90 degrees respectively, and when the fourth axis B-axis turntable 3 is at 0 degrees, the fifth axis C-axis turntable is tested at 90-degree intervals.

[0105] The cantilevered combined turntable has two turntables: a fourth-axis B-axis turntable (3) and a cantilevered fifth-axis C-axis turntable (4). The offset of the turntable brake needs to be detected under three conditions: 0 degrees, +90 degrees, and -90 degrees on the fourth-axis B-axis turntable. Therefore, at the three angles, the clamping and releasing of the brakes on both the fourth-axis B-axis and fifth-axis C-axis turntables are controlled respectively. The coordinates of the first and second sphere centers are measured for each angle, and the offset is calculated for each angle.

[0106] For a cantilevered combination turntable, the first sphere center coordinates refer to the sphere center coordinates of the standard sphere 14 when the brakes of the fourth axis (B-axis) and the fifth axis (C-axis) turntable are both in the released state.

[0107] The second sphere center coordinates include multiple values: the fourth axis B-axis turntable brake is released, and the fifth axis C-axis turntable brake is clamped; the fourth axis B-axis turntable brake is clamped, and the fifth axis C-axis turntable brake is released; the fourth axis B-axis turntable brake is clamped, and the fifth axis C-axis turntable brake is clamped. For each case, the second sphere center coordinates are acquired and the offset is calculated with the first sphere center coordinates.

[0108] It should be noted that when performing brake offset detection on the cantilever fourth axis turntable, the base 11 is usually installed on the fifth axis C-axis turntable, and the connecting rod 13 and the standard ball 14 are installed on the first mounting surface 121 of the top seat 12, so that the standard rod is installed perpendicular to the axis of the top seat 12. The connecting rod 13 does not interfere with the projection of the maximum diameter of the standard ball 14 on the horizontal plane, ensuring the accuracy of obtaining the center coordinates of the standard ball 14.

[0109] Furthermore, when the fourth axis B-axis turntable 3 is at 0 degrees, and the fifth axis C-axis turntable is at 90-degree intervals, the clamping and releasing of the brakes of the fourth axis B-axis turntable and the fifth axis C-axis turntable are controlled respectively. The coordinates of the first and second sphere centers are measured for each angle, and the offset at each angle is calculated.

[0110] like Figure 11 , Figure 12 and Figure 18 As shown, in this embodiment, when performing combined brake offset detection on a cradle-type combined turntable, obtaining the second center coordinates of the standard sphere 14 when the turntable brake is in the second state includes the following steps:

[0111] Step 1811: Obtain the different values ​​of the second sphere center coordinates when the brakes of the fourth axis A-axis turntable 2 are in the clamped or released state, and when the brakes of the fifth axis C-axis turntable are in the clamped or released state.

[0112] Specifically, the fourth axis A-axis turntable 2 is tested at 0 degrees, +90 degrees and -90 degrees respectively, and when the fourth axis A-axis turntable is at 0 degrees, the fifth axis C-axis turntable is tested at 90-degree intervals.

[0113] The cradle-type combined turntable has two turntables: a fourth-axis A-axis turntable 2 and a fifth-axis C-axis turntable 5. When performing combined brake detection on the fourth-axis A-axis turntable 2 and the fifth-axis C-axis turntable, the brake offset needs to be detected under three conditions: 0 degrees, +90 degrees, and -90 degrees on the fourth-axis A-axis turntable. Therefore, at the three angles, the clamping and releasing of the brakes on the fourth-axis A-axis turntable 2 and the fifth-axis C-axis turntable are controlled respectively. The coordinates of the first and second sphere centers are measured for each angle, and the offset is calculated for each angle.

[0114] For the combined brake detection of the fourth-axis turntable and the fifth-axis turntable, the first ball center coordinates refer to the ball center coordinates of the standard ball 14 when both the fourth-axis A-axis turntable 2 and the fifth-axis C-axis turntable are in the released state.

[0115] The second sphere center coordinates contain multiple values: the fourth axis A-axis turntable 2 brake is clamped, and the fifth axis C-axis turntable brake is released; the fourth axis A-axis turntable 2 brake is released, and the fifth axis C-axis turntable brake is clamped; the fourth axis A-axis turntable 2 brake is clamped, and the fifth axis C-axis turntable brake is clamped. For each case, the second sphere center coordinates are acquired and the offset is calculated with the first sphere center coordinates.

[0116] When the fourth axis A-axis turntable 2 is at 0 degrees, the rotation of the fifth axis C-axis turntable can also be adjusted. The brake status of the fourth axis A-axis turntable 2 and the fifth axis C-axis turntable is adjusted every 90 degrees. The coordinates of the first sphere center and the second sphere center are collected to obtain the offset of the fifth axis C-axis turntable at different rotation angles.

[0117] It should be noted that when performing combined brake offset detection on the fourth axis A-axis turntable 2 and the fifth axis C-axis turntable, the base 11 is usually installed on the fifth axis C-axis turntable, and the connecting rod 13 and the standard ball 14 are installed on the first mounting surface 121 of the top seat 12, so that the standard rod is installed perpendicular to the axis of the top seat 12. The connecting rod 13 does not interfere with the projection of the maximum diameter of the standard ball 14 on the horizontal plane, ensuring the accuracy of obtaining the center coordinates of the standard ball 14.

[0118] Furthermore, when the fourth axis A-axis turntable 3 is at 0 degrees, and the fifth axis C-axis turntable is at 90-degree intervals, the clamping and releasing of the brakes of the fourth axis A-axis turntable and the fifth axis C-axis turntable are controlled respectively. The first and second sphere center coordinates of each angle are measured respectively, and the offset at each angle is calculated.

[0119] like Figure 19 , Figure 20 and Figure 21 As shown, the step of obtaining the first center coordinates of the standard sphere 14 when the turntable brake is in the first state, as described in this embodiment, includes:

[0120] Step 1911: Obtain the Z coordinate of the sphere's center.

[0121] Step 1912: Based on the Z coordinate of the sphere's center, obtain the maximum diameter cross-sectional circle of the standard sphere 14.

[0122] Step 1913: Obtain multiple uniformly distributed measurement points based on the circle with the largest diameter cross section, obtain the XY coordinates of the multiple measurement points, and calculate the XY coordinates of the sphere's center.

[0123] In this embodiment, a detector is used to detect the coordinates of the wall of a standard sphere 14. First, the detector detects the vertices over a large area of ​​the standard sphere 14 to obtain a rough Z-coordinate. Subtracting the radius of the standard sphere 14, a Z-axis height close to the center of the sphere is obtained. At this Z-axis height, the detector detects the coordinates (X1, Y1) and (X2, Y2) of four equally divided points. The X-coordinate of the center of the current cross-sectional circle is (X1+X2) / 2, and the Y-coordinate is (Y1+Y2) / 2. The vertex Z of the standard sphere 14 is found through the center coordinates along the normal of the current cross-sectional circle. Subtracting the radius from the vertex Z gives the Z-coordinate of the sphere's center. The circle intercepted horizontally at this Z-axis height of the sphere's center is the cross-sectional circle with the maximum diameter of the standard sphere 14.

[0124] Eight measurement points were evenly distributed on the maximum diameter cross-section of the standard sphere 14. The XY coordinates of these eight points were obtained, and the XY coordinates of the sphere's center were calculated using the least squares method. The Z coordinate of the sphere's center was the Z coordinate of the sphere's vertex minus the radius of the standard sphere 14.

[0125] It should be noted that, for obtaining the second center coordinates of the standard ball 14 when the turntable brake is in its second state, since the difference between the first and second center coordinates lies only in the clamping and releasing of the turntable brake, the method for obtaining the center coordinates is the same. The method for obtaining the second center coordinates is exactly the same as the method for obtaining the first center coordinates, and will not be repeated here.

[0126] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A turntable brake biasing detection device, characterized by, The utility model relates to a standard ball for brake offset detection of rotary table, comprising: a base, a top seat, a connecting rod and a standard ball; the base is used for installation on the rotary table, the first end of the top seat is connected with the base, and the second end of the top seat has a first mounting surface; one end of the connecting rod is connected with the standard ball, and the other end of the connecting rod is connected with the first mounting surface and is arranged perpendicularly to the first mounting surface; the second end of the top seat also has a second mounting surface; the first mounting surface and the second mounting surface are connected obliquely; the other end of the connecting rod is selectively connected with the first mounting surface or the second mounting surface; the base and the top seat are connected through an adapter seat; the adapter seat is provided with a plurality of adapter seats with different height specifications; both ends of the base are provided with U-shaped holes; the U-shaped hole extends along the length direction of the base, and a stepped groove is arranged in the hole wall of the U-shaped hole.

2. The turntable brake offset detection device according to claim 1, characterized by The included angle between the first mounting surface and the second mounting surface is 135 degrees.

3. A detection method based on the turntable brake offset detection device according to any one of claims 1 to 2, characterized in that, The utility model relates to a standard ball for brake offset detection of rotary table, comprising: obtaining the first ball center coordinates of the standard ball when the rotary table brake is in the first state; obtaining the second ball center coordinates of the standard ball when the rotary table brake is in the second state; based on the first ball center coordinates and the second ball center coordinates, the ball center offset of the standard ball is calculated.

4. The detection method according to claim 3, characterized in that, In the case of brake offset detection of a single fourth-axis rotary table, the utility model further comprises: adjusting the angle of the connecting rod to ensure that the maximum diameter of the standard ball does not interfere with the projection of the connecting rod in the horizontal plane.

5. The detection method according to claim 3, characterized in that, In the case of brake offset detection of a cantilever combined rotary table, the step of obtaining the second ball center coordinates of the standard ball when the rotary table brake is in the second state comprises: obtaining different values of the second ball center coordinates of the standard ball when the fourth-axis B-axis rotary table brake and the fifth-axis C-axis rotary table brake are in the clamped or loosened state respectively; wherein the fourth-axis B-axis rotary table is detected at 0 degrees, +90 degrees and -90 degrees respectively, and the fifth-axis C-axis rotary table is detected every 90 degrees when the fourth-axis B-axis rotary table is at 0 degrees.

6. The method of claim 3, wherein, In the case of brake offset detection of a cradle combined rotary table, the step of obtaining the second ball center coordinates of the standard ball when the rotary table brake is in the second state comprises: obtaining different values of the second ball center coordinates when the fourth-axis A-axis rotary table brake is in the clamped or loosened state respectively, and the fifth-axis rotary table is in the clamped or loosened state respectively; wherein the fourth-axis A-axis rotary table is detected at 0 degrees, +90 degrees and -90 degrees respectively, and the fifth-axis C-axis rotary table is detected every 90 degrees when the fourth-axis A-axis rotary table is at 0 degrees.

7. The detection method according to claim 3, characterized in that, The step of obtaining the first ball center coordinates of the standard ball when the rotary table brake is in the first state comprises: obtaining the Z coordinate of the ball center; based on the Z coordinate of the ball center, obtaining the maximum diameter cross section circle of the standard ball; based on the maximum diameter cross section circle, obtaining a plurality of uniformly distributed measuring points, obtaining the XY coordinates of the plurality of measuring points, and calculating the XY coordinates of the ball center.

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