A tool movement coordinate detection method for forming a small pitch bolt

Abstract

The application provides a tool movement coordinate detection method for forming a small pitch bolt, the distance T3 between the current Z-axis coordinate of the tool and the same horizontal height right limit coordinate is detected, when the distance between the tool and the right limit coordinate is less than the offset, the tool moves according to the distance T3 between the current self and the right limit coordinate, the distance t0 between the current X coordinate of the tool and the X-axis end coordinate is detected, when the distance between the tool and the X-axis end coordinate is less than the feed depth, the tool moves according to the distance t0 between the current self and the X-axis end coordinate, the cutting precision is high, and the tool will not cut the machining area of the workpiece.

Description

TECHNICAL FIELD

[0001] The present application relates to a tool cutting movement method, in particular to a tool movement coordinate detection method for forming a small pitch bolt. BACKGROUND

[0002] A marine crane needs to be installed by bolt connection, which involves processing the bolt, and a numerical control lathe drives the tool movement to process the bolt. When driving the tool movement, the tool movement path needs to be planned. A large pitch triangular pyramid thread processing method is disclosed in a patent document with Chinese application number 201010548760.8 and publication date 2012.5.23. The method uses the tool tip to cut layer by layer along the thread tooth type angle point. The left and right sides of the tool can be used for cutting. After cutting from the left and right sides, the middle part can form the thread to be processed. When there is too much excess material on the thread formed by the left and right cutting, a straight cutting method is used to cut the excess material on the thread. The starting processing depth can be set according to the needs, and then the machine tool system calculates and gradually increases the cutting depth according to the program requirements.

[0003] The processing method gradually increases the cutting depth to process the thread, but cannot detect whether the tool movement will cause excessive cutting, and cannot adjust the tool movement distance within the preset range. SUMMARY

[0004] The present application provides a tool movement coordinate detection method for forming a small pitch bolt, which detects the tool movement coordinates and judges whether the tool will cause excessive cutting on the workpiece to be processed.

[0005] To achieve the above purpose, the technical scheme of the present application is as follows: a tool movement coordinate detection method for forming a small pitch bolt, comprising the following steps:

[0006] S1, preset two or more left limit coordinates and two or more right limit coordinates in the conical thread groove; the left limit coordinate and the right limit coordinate at the same horizontal height have one tool path; the tool path is gradually shortened along the depth of the conical thread groove, and the tool path has a tool path between adjacent tool paths, a tool path offset T on the Z axis, and a tool path depth t on the X axis.

[0007] S2, the tool starts to cut the workpiece to be processed along the different horizontal height tool paths in sequence from the uppermost tool path.

[0008] S3, detecting the distance T3 between the left limit coordinate of the next tool path and the right limit coordinate on the same horizontal level, and judging whether T3 is greater than T; if T3>T, the Z coordinate of the tool starting point is moved by a distance T before starting the next tool path; if T3T, the Z coordinate of the tool starting point is moved by a distance T0 before starting the next tool path.

[0009] S4, detecting the distance t0 between the current X coordinate of the tool and the X axis end point coordinate of the conical thread groove; judging whether t0 is greater than t, if t0>t, the tool is moved by a distance t to the X axis end point coordinate; if t0<t, the tool is moved by a distance t0 to the X axis end point coordinate.

[0010] The above method, when moving the tool along the Z axis, calculates the distance T3 between the current Z axis coordinate of the tool and the right limit coordinate on the same horizontal level, and adjusts the moving distance of the tool along the Z axis according to the size between T3 and T, so as to ensure that the tool moves within the range from the left limit coordinate to the right limit coordinate, and avoid the problem of excessive cutting caused by the coordinate of the tool after moving exceeding the right limit coordinate.

[0011] When moving the tool along the X axis, the distance t0 between the current X coordinate of the tool and the X axis end point coordinate is calculated; the moving distance of the tool along the X axis is adjusted according to the size between t0 and t, so as to ensure that the tool moves between the X axis starting point coordinate and the X axis end point coordinate, and avoid the problem of excessive cutting caused by the coordinate of the tool after moving exceeding the X axis end point coordinate, resulting in the current thread processing diameter being smaller than the required diameter.

[0012] By detecting the distance T3 between the current Z axis coordinate of the tool and the right limit coordinate on the same horizontal level, when the distance between the tool and the right limit coordinate is less than the offset, the tool moves according to the current distance T3 between itself and the right limit coordinate, with high cutting precision and without cutting the machining area of the workpiece.

[0013] By detecting the distance t0 between the current X coordinate of the tool and the X axis end point coordinate, when the distance between the tool and the X axis end point coordinate is less than the feed depth, the tool moves according to the current distance t0 between itself and the X axis end point coordinate, with high cutting precision and without cutting the machining area of the workpiece.

[0014] Further, in S3, the distance T3 between the current Z axis coordinate of the tool and the right limit coordinate on the same horizontal level is detected in real time.

[0015] The above method detects the Z axis moving coordinate of the tool on each tool path in real time, with good accuracy.

[0016] Further, in S3, when moving to the last tool path, the distance T3 between the current Z coordinate of the tool and the right limit coordinate at the same height is detected.

[0017] The above method, before reaching the next tool path, the distance between the tool and the right limit coordinate is far, and the tool after deflection is still within the range of the left limit coordinate and the right limit coordinate; since the travel of the last tool path is short, moving the tool according to the original deflection amount T is easy to cause excessive cutting, and the detection is only performed when moving to the last tool path, which avoids excessive cutting of the tool and reduces the detection frequency of the tool deflection distance, thereby improving the working efficiency of cutting.

[0018] Further, in S4, the distance t0 between the current X coordinate of the tool and the X axis end point coordinate of the tapered thread groove is detected in real time.

[0019] The above method, by performing real-time detection, the X axis movement coordinate of the tool is detected on each tool path, which is accurate.

[0020] Further, in S4, when moving to the last tool path, the distance t0 between the current X coordinate of the tool and the X axis end point coordinate of the tapered thread groove is detected.

[0021] The above method, before reaching the next tool path, the distance between the tool and the X axis end point coordinate is far, and the tool after deflection is still within the range of the X axis start point coordinate and the X axis end point coordinate; since the travel of the last tool path is short, moving the tool according to the original deflection depth tT is easy to cause excessive cutting, and the detection is only performed when moving to the last tool path, which avoids excessive cutting of the tool and reduces the detection frequency of the tool deflection distance, thereby improving the working efficiency of cutting. BRIEF DESCRIPTION OF DRAWINGS

[0022] Fig. 1 The flowchart of the present application.

[0023] Fig. 2 The schematic diagram of detecting the movement of the tool using the present application. DETAILED DESCRIPTION

[0024] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0025] As shown in the drawings, a tool movement coordinate detection method for forming a small pitch bolt comprises the following steps: Figs. 1-2

[0026] ​S1, preset more than two left limit coordinates and more than two right limit coordinates in the tapered thread groove; the left limit coordinate and the right limit coordinate at the same horizontal height have one tool path; preset the deflection amount T of the tool path between adjacent tool paths in the Z axis and the depth of cut t in the X axis; with the deepening of the depth of the tapered thread groove, the track of the tool path gradually shortens.

[0027] S2, the tool starts to cut the workpiece along the different horizontal height tool paths in sequence from the uppermost tool path.

[0028] S3, detect the distance T3 between the left limit coordinate of the next tool path of the tool and the right limit coordinate at the same horizontal height, and judge whether T3 is greater than T; if T3>T, then the Z coordinate of the starting point of the tool is moved by a distance T before the tool starts to cut in the next time; if T3

[0029] S4, detect the distance t0 between the current X coordinate of the tool and the X axis end point coordinate of the tapered thread groove; judge whether t0 is greater than t; if t0>t, then the tool moves by a distance t towards the X axis end point coordinate; if t0

[0030] In the above method, when the tool moves along the Z axis, the distance T3 between the current Z axis coordinate of the tool and the right limit coordinate at the same horizontal height is calculated, and the moving distance of the tool in the Z axis is adjusted according to the size relationship between T3 and T, so as to ensure that the tool moves within the range from the left limit coordinate to the right limit coordinate, and avoid the problem of excessive cutting caused by the coordinate of the tool after moving exceeding the right limit coordinate.

[0031] When the tool moves along the X axis, the distance t0 between the current X coordinate of the tool and the X axis end point coordinate is calculated; the moving distance of the tool in the X axis is adjusted according to the size relationship between t0 and t, so as to ensure that the tool moves between the X axis starting point coordinate and the X axis end point coordinate, and avoid the problem of excessive cutting caused by the coordinate of the tool after moving exceeding the X axis end point coordinate, which results in the current thread processing diameter being smaller than the required diameter.

[0032] By detecting the distance T3 between the current Z axis coordinate of the tool and the right limit coordinate at the same horizontal height, when the distance between the tool and the right limit coordinate is less than the deflection amount, the tool moves according to the distance T3 between the current itself and the right limit coordinate, so as to have high cutting precision and not to cut the machining area of the workpiece.

[0033] By detecting the distance t0 between the current X coordinate of the tool and the X axis end point coordinate, when the distance between the tool and the X axis end point coordinate is less than the depth of cut, the tool moves according to the distance t0 between the current itself and the X axis end point coordinate, so as to have high cutting precision and not to cut the machining area of the workpiece.

[0034] In S3, the distance T3 between the current Z-axis coordinate of the tool and the right limit coordinate at the same horizontal height is detected in real time, or the distance T3 between the current Z-axis coordinate of the tool and the right limit coordinate at the same horizontal height is detected when moving to the last tool path. For real-time detection, the Z-axis movement coordinate of the tool is detected on each tool path by real-time detection, which is accurate. For detection when moving to the last tool path, the distance between the tool and the right limit coordinate is far before reaching the movement of the next tool path, and the tool after the tool deflection is still within the range of the left limit coordinate and the right limit coordinate; since the stroke of the last tool path is short, the tool is easily overcut by moving according to the original tool deflection T, so detection is performed only when moving to the last tool path to avoid overcutting of the tool, while reducing the number of detection times of the tool deflection distance and improving the working efficiency of cutting.

[0035] In this embodiment, in S3, the distance T3 between the current Z-axis coordinate of the tool and the right limit coordinate at the same horizontal height is detected when moving to the last tool path.

[0036] In S4, the distance t0 between the current X coordinate of the tool and the X-axis end point coordinate of the tapered thread groove is detected in real time, or the distance t0 between the current X coordinate of the tool and the X-axis end point coordinate of the tapered thread groove is detected when moving to the last tool path.

[0037] For real-time detection, the X-axis movement coordinate of the tool is detected on each tool path by real-time detection, which is accurate; for detection when moving to the last tool path, the distance between the tool and the X-axis end point coordinate is far before reaching the movement of the next tool path, and the tool after the tool deflection is still within the range of the X-axis start point coordinate and the X-axis end point coordinate; since the stroke of the last tool path is short, the tool is easily overcut by moving according to the original tool deflection tT, so detection is performed only when moving to the last tool path to avoid overcutting of the tool, while reducing the number of detection times of the tool deflection distance and improving the working efficiency of cutting.

[0038] In this embodiment, in S4, the distance t0 between the current X coordinate of the tool and the X-axis end point coordinate of the tapered thread groove is detected when moving to the last tool path.

[0039] When machining the tapered thread groove, the width of the tapered thread groove changes along its taper, and the left limit coordinate and the right limit coordinate change compared with the previous layer in each layer of tool path; the tool feed depth also changes; thus, the deflection amount and the tool feed depth of the tool movement in each tool path need to be detected.

[0040] The following examples illustrate this:

[0041] In this embodiment, the offset T is 0.4 mm, and the depth of cut t is 0.4 mm; refer to Fig. 2 As described above, there are tool paths with different horizontal heights corresponding to the depth of the tapered thread groove; along the depth direction of the tapered thread groove, the distance between the left limit coordinate and the right limit coordinate gradually decreases;

[0042] In S3, such as Fig. 2 As shown, if the distance between the left extreme coordinate of the next tool path and the right extreme coordinate at the same horizontal height is 0.6, then T3 is 0.6, T3 > T. In the next tool path, the Z coordinate of the tool's starting point moves a distance T before starting the tool path, moving from the current starting point to the right extreme coordinate at the same horizontal height. If the distance between the left extreme coordinate of the next tool path and the right extreme coordinate at the same horizontal height is 0.2, then T3 is 0.2, T3 < T. In the next tool path, the Z coordinate of the tool's starting point moves a distance T3 before starting the tool path, moving from the current starting point to the right extreme coordinate at the same horizontal height.

[0043] In S4, the X-axis endpoint coordinate of the tapered thread groove is 12.7, referencing... Fig. 2 At point K1, if the current X-axis coordinate of the tool is 13.3, then t0 is 0.6, and t0 > t. At this point, the tool moves a distance t towards the endpoint coordinate on the X-axis. The tool's depth of cut is changed. After the tool completes thread cutting along the current depth of cut, the tool needs to move again, referring to... Fig. 2 At point K2, the current Z-axis coordinate of the tool is 13.1, so t0 is 0.2, t0 < t. At this time, the tool moves a distance of t0 when it moves towards the X-axis endpoint coordinate; after changing the tool's depth of cut, cutting is performed again.

Claims

1. A method for detecting the movement coordinates of a tool forming a small-pitch bolt, characterized in that: Includes the following steps: S1. In the tapered thread groove, there are two or more left limit coordinates and two or more right limit coordinates. There is one tool path between the left limit coordinates and the right limit coordinates at the same horizontal height. The tool deviation between adjacent tool paths is set to T on the Z-axis and the tool depth on the X-axis is set to t. As the depth of the tapered thread groove increases, the trajectory of the tool path gradually shortens. S2. The tool moves down along different horizontal paths from the top tool path to cut the workpiece. S3. Detect the distance T3 between the left limit coordinate of the next tool path and the right limit coordinate at the same horizontal height, and determine whether T3 is greater than T. If T3 > T, then the tool will move its Z coordinate by a distance T before starting the next tool path. If T3 < T, then in the next tool movement, the Z coordinate of the tool starting point will move a distance of T3 before the tool begins to move. S4. Detect the distance t0 between the current X coordinate of the tool and the X-axis endpoint coordinate of the tapered thread groove; determine whether t0 is greater than t. If t0 > t, the tool moves a distance t towards the X-axis endpoint coordinate; if t0 < t, the tool moves a distance t0 towards the X-axis endpoint coordinate.

2. The method for detecting the movement coordinates of a tool forming a small-pitch bolt according to claim 1, characterized in that: In S3, the distance T3 between the current Z-axis coordinate of the tool and the right limit coordinate at the same horizontal height is detected in real time.

3. The method for detecting the movement coordinates of a tool forming a small-pitch bolt according to claim 1, characterized in that: In S3, when moving towards the last toolpath, the distance T3 between the current Z-axis coordinate of the tool and the right limit coordinate at the same horizontal height is detected.

4. The method for detecting the movement coordinates of a tool forming a small-pitch bolt according to claim 1, characterized in that: In S4, the distance t0 between the current X coordinate of the tool and the X-axis endpoint coordinate of the tapered thread groove is detected in real time.

5. The method for detecting the movement coordinates of a tool forming a small-pitch bolt according to claim 1, characterized in that: In S4, when moving towards the last tool path, the distance t0 between the current X coordinate of the tool and the X-axis endpoint coordinate of the tapered thread groove is detected.

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