Thread intermittent turning control method

Abstract

The invention relates to the technical field of machine tool control methods, in particular to a thread intermittent turning control method which comprises the following steps: S1, establishing a lathe coordinate system, and determining an X axis as a vertical axis; s2, the feed path is controlled to be inclined by a preset angle along the X axis of a machine tool coordinate system; s3, the feeding path of the tool on the workpiece in the X-axis depth direction is controlled to be a composite path, and the composite path comprises a first linear path, a first oblique line inclining upwards and a second oblique line inclining downwards which are sequentially connected; and S4, after the cutter moves to the end point along the composite path, the feeding path of the cutter on the workpiece is controlled to be a second linear path. According to the thread intermittent turning control method, it can be guaranteed that cuttings are effectively broken in the whole machining process, the purpose of breaking the cuttings is achieved, the risk that the cuttings are wound and accumulated in the machining process is avoided, and the working efficiency is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of machine tool control methods, in particular to a thread intermittent turning control method. BACKGROUND

[0002] Stainless steel material has large plasticity, and plastic deformation is prone to occur during cutting. During turning, the chip is not easy to break, and the machined surface is easy to scratch. The chip winding and accumulation will affect the cooling and lubrication conditions and the tool life, and in severe cases, it may cause equipment failure and safety accidents of operators, which seriously restricts the automatic machining process of parts.

[0003] Therefore, the turning method in the prior art has the problems of low work efficiency, chip winding and accumulation. SUMMARY

[0004] The present application provides a thread intermittent turning control method to solve the defects of low work efficiency, chip winding and accumulation in the prior art turning method.

[0005] The present application provides a thread intermittent turning control method, comprising: S1, establishing a lathe coordinate system and determining the X axis as the vertical axis; S2, controlling the feed path to be inclined at a preset angle along the X axis of the machine tool coordinate system; S3, controlling the tool to move along the X axis depth direction on the workpiece to be a composite path, the composite path comprising: a first straight line path, a first inclined line upward and a second inclined line downward connected in turn; S4, after the tool moves to the end point along the composite path, controlling the tool to move along the X axis depth direction on the workpiece to be a second straight line path on the line of the composite path.

[0006] According to the thread intermittent turning control method provided by the present application, the step of controlling the feed path to be inclined at a preset angle along the X axis of the machine tool coordinate system comprises: controlling the feed path to be inclined at 20°-29° along the X axis of the machine tool coordinate system.

[0007] According to the thread intermittent turning control method provided by the present application, the height H of the first inclined line and / or the second inclined line satisfies: H>h(1+tan(α) / tan30°); Wherein, h represents the depth of the tool along the first straight line path; α represents the preset angle of the feed path inclined along the X axis of the machine tool coordinate system.

[0008] According to the thread intermittent turning control method provided by the present application, the angle of α is in the range of 20°-29°.

[0009] According to the thread intermittent turning control method provided by the application, the starting point and the ending point of the second straight line path are the same as the starting point and the ending point of the compound path; and the depth of the second straight line path is the same as the depth of the first straight line path.

[0010] According to the thread intermittent turning control method provided by the application, after the step of establishing the lathe coordinate system and determining the X axis as the vertical axis, the method further comprises: In the lathe coordinate system, the compound path and the second straight line path of the tool cutting path are drawn, and the sizes in the compound path and the second straight line path are defined as variable parameters.

[0011] According to the thread intermittent turning control method provided by the application, the sizes in the compound path and the second straight line path comprise: the thread diameter, the thread pitch, the thread starting point, the thread ending point, the thread lead-in amount, the feed angle, the length of the first straight line path, the length and the height of the first inclined line, the length and the height of the second inclined line, and the thread cutting depth each time.

[0012] According to the thread intermittent turning control method provided by the application, the length of the first straight line path is P times of the thread pitch; wherein P is in the range of 0.5-2.

[0013] According to the thread intermittent turning control method provided by the application, the length of the first inclined line and the length of the second inclined line are 40%-60% of the length of the first straight line path; and the height of the first inclined line and the height of the second inclined line are 2.5-3 times of the thread cutting depth each time.

[0014] According to the thread intermittent turning control method provided by the application, the step of drawing the compound path and the second straight line path of the tool cutting path in the lathe coordinate system and defining the sizes in the compound path and the second straight line path as variable parameters comprises: In the lathe coordinate system, the compound path and the second straight line path of the tool cutting path are drawn in the CAM software, and the sizes in the compound path and the second straight line path are defined as variable parameters. After the step of controlling the tool cutting path along the X axis depth direction on the line of the compound path on the workpiece to be the second straight line path after the tool moves to the ending point along the compound path, the method further comprises the process of converting the tool cutting path into a numerical control program: outputting the numerical control program head instruction; reading the coordinate data of each point of the tool cutting path; converting each coordinate point into a G code instruction and outputting the G code instruction; outputting the numerical control program tail instruction; forming a numerical control program file.

[0015] The application provides a thread intermittent turning control method, which comprises the following steps: S1, establishing a lathe coordinate system and determining an X axis as a vertical axis; S2, controlling an infeed path to be inclined at a preset angle along the X axis of the lathe coordinate system; S3, controlling a tool to move along an X axis depth direction on a workpiece in a compound path, wherein the compound path comprises a first straight line path, a first inclined line inclined upward and a second inclined line inclined downward which are sequentially connected; and S4, after the tool moves to an end point along the compound path, controlling the tool to move along an X axis depth direction on the workpiece in a second straight line path on a line of the compound path. The thread intermittent turning control method can ensure effective chip breaking in the whole machining process, achieves the purpose of chip breaking, and has no risk of chip winding and accumulation in the machining process, and has high work efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0017] Figure 1 is one of the flowcharts of the thread intermittent turning control method provided in one of the embodiments of the application.

[0018] Figure 2 is a schematic diagram of the vertical infeed in the prior art.

[0019] Figure 3 is a schematic diagram of the inclined line path infeed in the application.

[0020] Figure 4 is Figure 3 is a partial schematic diagram of I in the figure.

[0021] Figure 5 is a path diagram of the tool moving along a compound path unit.

[0022] Figure 6 is a path diagram of the tool moving along the compound path.

[0023] Figure 7 is a schematic diagram of the chip generated by the tool moving along the compound path.

[0024] Figure 8 is a schematic diagram of the chip generated by the tool moving along the second straight line path.

[0025] Figure 9 is a tool moving path diagram according to steps S1 to S3.

[0026] Figure 10 is a tool path map in which the tool moves according to step S4.

[0027] Figure 11 is a tool path map in which the tool moves according to step S3 repeatedly.

[0028] Figure 12 is a tool path map in which the tool moves according to step S4 repeatedly.

[0029] Figure 13 is a tool path map in which the tool moves according to steps S3 and S4 repeatedly.

[0030] Figure 14 is a structural schematic diagram of an electronic device provided by the present application.

[0031] Figure 15 is a chip formation schematic diagram formed according to a conventional process.

[0032] Figure 16 is a chip formed according to the thread interrupted turning control method of the present application.

[0033] Reference signs: 810: processor; 820: communication interface; 830: memory; 840: communication bus. DETAILED DESCRIPTION

[0034] In order to make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below in conjunction with the drawings in the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0035] In the description of the present embodiment, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present embodiment and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present embodiment.

[0036] In addition, the terms "first", "second", etc. are used only for descriptive purposes and should not be construed as implying or suggesting relative importance or an indicated number of the technical features. Thus, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the embodiments, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0037] In the embodiments, unless otherwise explicitly specified and limited, the terms "arranged", "mounted", "connected", "linked", "fixed" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the embodiments can be understood according to the specific circumstances.

[0038] In the embodiments, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature can be above or obliquely above the second feature, or it can only mean that the horizontal height of the first feature is higher than that of the second feature. The first feature can be below or obliquely below the second feature, or it can only mean that the horizontal height of the first feature is less than that of the second feature.

[0039] The following will be described in combination with Figures 1-16 A thread intermittent turning control method is described. The thread intermittent turning control method specifically includes the following steps: S1, establishing a lathe coordinate system, and determining the X axis as a vertical axis; S2, controlling the feed path to be inclined at a preset angle along the X axis of the machine tool coordinate system; S3, controlling the tool to move along the X axis depth direction on the workpiece as a composite path, the composite path including: a first straight line path, a first inclined line upwardly inclined, and a second inclined line downwardly inclined, which are connected in sequence; S4, after the tool moves to the end point along the composite path, controlling the tool to move along the X axis depth direction on the workpiece as a second straight line path on the line of the composite path.

[0040] Specifically, this invention provides a thread intermittent turning control method, which is used to control and break chips during the thread turning process, including: turning path planning and turning program generation. The following explanation uses the turning of metric external threads as an example. For a lathe, the established lathe coordinate system generally has a horizontal Z-axis and a vertical X-axis.

[0041] The turning path planning steps include: tool approach path planning (i.e., step S2 of this invention) and tool feed path planning (i.e., steps S3 and S4 of this invention). It should be understood that during turning, by rotating the workpiece, a threaded groove is formed on the outer circumference of the workpiece under the cutting action of the tool, and the tool path planning only changes in the depth direction of the workpiece.

[0042] Tool path planning: The tool path is an oblique line, inclined at 20°~29° to the X-axis of the machine tool coordinate system. During thread cutting, this invention differs from the vertical tool entry method in existing technologies (such as...). Figure 2 As shown), use a diagonal path for tool entry (e.g.) Figure 3 and Figure 4 As shown in the figure, the cutting edge on one side of the tool can undertake the main material removal task. At this time, it is easier for the tool to guide the chips and form a more regular spiral chip.

[0043] Toolpath planning: Toolpaths include compound paths and straight paths. For example... Figure 5 and Figure 6 As shown, a compound path is composed of multiple compound path units connected together. Near the end, when the path length is less than one compound path unit, the path is completed with a straight line. Each compound path unit includes a short straight line segment (i.e., the first straight line path), an upward-sloping line segment (i.e., the first oblique line), and a downward-sloping line segment (i.e., the second oblique line); the straight line path is a longer line segment (i.e., the second straight line path). The starting point of the compound path is located on the infeed path oblique line, and the starting and ending points of the straight lines and compound paths are aligned vertically; the position of the path ending point is related to the required thread length.

[0044] During machining, the tool moves along a sloped feed path to the beginning of a compound path, then continues along the compound path. During a short straight section, the tool contacts the workpiece material, removing material and generating chips. As the tool continues along the upward-sloping slope, it gradually separates from the material, ceasing cutting action and breaking the chips. When the tool moves to the downward-sloping slope, it gradually contacts the material again, generating cutting action and forming the next chip segment. This process repeats until the tool reaches the end of the compound path. Each time the tool moves one compound path unit, it generates one chip segment. The tool movement process is as follows: Figure 7The total length of the chip is determined when the thread machining length is determined, and the number of the composite path units is increased, so that the number of the chip segments is increased, thereby controlling the length of the chip. After the tool moves along the composite path to cut the workpiece, the thread grooves with different depths will appear at different positions in the length direction of the workpiece.

[0045] On the basis of the thread grooves with different depths, the tool moves along a longer straight path (i.e., the second straight path) to cut the material at the shallow thread groove (i.e., within the range of the first inclined line and the second inclined line passed by the tool), and does not cut the material at the deep thread groove (i.e., within the range of the first straight path passed by the tool), so that the segmented chip is formed, as shown in Figure 8 .

[0046] Therefore, the tool moves alternately along the composite path and the second straight path during the path planning, i.e., the tool moves according to steps S1 to S3, and the tool path is Figure 9 ; then, the tool moves according to step S4, and the tool path is Figure 10 ; then, the tool repeats steps S3 and S4, and the tool paths are Figure 11 and Figure 12 , respectively; finally, after repeating steps S3 and S4 for multiple times, the tool path is formed as Figure 13 . Through the above path planning, the chip can be effectively segmented during the whole machining process, so that the chip breaking purpose is achieved.

[0047] The chip formed according to the conventional program has a shape as shown in Figure 15 ; the chip formed according to the thread intermittent turning control method has a shape as shown in Figure 16 . According to the comparison of the chip products, the thread turning is performed by using the method of the present application, so that the spiral chip with a length of 20-40 mm is formed, the chip shape is regular, the size is moderate, there is no risk of chip winding and accumulation during the machining process, and the work efficiency is high.

[0048] The thread intermittent turning control method provided by the present application comprises the following steps: S1, establishing a lathe coordinate system and determining that the X axis is a vertical axis; S2, controlling the feed path to be inclined at a preset angle along the X axis of the lathe coordinate system; S3, controlling the tool path of the tool in the depth direction of the X axis on the workpiece to be a composite path, and the composite path comprises a first straight path, a first inclined line inclined upward, and a second inclined line inclined downward connected in sequence; and S4, after the tool moves along the composite path to the end point, controlling the tool path of the tool in the depth direction of the X axis on the workpiece along the line of the composite path to be a second straight path. The thread intermittent turning control method provided by the present application can ensure that the chip is effectively segmented during the whole machining process, so that the chip breaking purpose is achieved, there is no risk of chip winding and accumulation during the machining process, and the work efficiency is high.

[0049] In one of the embodiments of the present application, the step of controlling the tool feed path to be inclined at a preset angle along the X-axis of the machine tool coordinate system, i.e. step S2, specifically comprises: controlling the tool feed path to be inclined at an angle of 20°-29° along the X-axis of the machine tool coordinate system.

[0050] In one of the embodiments of the present application, the height H of the first inclined line and / or the second inclined line satisfies: H>h(1+tan(α) / tan30°); wherein h represents the depth of the tool along the first straight line path; and α represents the preset angle of the tool feed path along the X-axis of the machine tool coordinate system.

[0051] In one of the embodiments of the present application, the angle α ranges from 20° to 29°. Assuming that the thread cutting depth is h (i.e. the depth of the tool along the first straight line path), the angle of the inclined line is α, the cutting depth is h, and the thread profile angle is 60°, in order to make the tool and the workpiece material contact and separate alternately when the tool moves along the broken line path during the cutting process, the height H of the inclined line satisfies the above formula. Since α generally ranges from 20° to 29°, the calculation result of tan(α) / tan30° is close to 1, and thus H>2h is satisfied.

[0052] In one of the embodiments of the present application, the starting point and the ending point of the second straight line path are the same as the starting point and the ending point of the composite path; and the depth of the second straight line path is the same as the depth of the first straight line path. In this embodiment, the starting point of the second straight line path is the same as the starting point of the first straight line path, the ending point of the second straight line path is the same as the ending point of the composite path, and the depth of the second straight line path is the same as the depth of the first straight line path. That is, the circumferential trajectory of the second straight line path on the workpiece is the same as the circumferential trajectory of the composite path, and only the trajectory in the depth direction of the workpiece is different. After the tool performs cutting according to the composite path and the second straight line path in sequence, a plurality of complementary chips are formed.

[0053] In one of the embodiments of the present application, after the step of establishing the lathe coordinate system and determining the X-axis as the vertical axis, i.e. after step S1, the method further comprises: drawing the composite path and the second straight line path of the tool path in the lathe coordinate system, and defining the dimensions in the composite path and the second straight line path as variable parameters. When the machined material and the thread specification change, all related parameters can be adjusted according to the actual machining needs. For example, when the material hardness is high and the thread pitch is large, the number of cutting times increases; when the thread diameter and the length dimension are different, the thread diameter, the thread starting point, and the thread ending point are adjusted to meet the machining of different specifications of threads and improve the versatility. Therefore, the above parameters are defined as variables.

[0054] In one of the embodiments of the present application, the sizes in the composite path and the second straight path, i.e., the defined variable parameters, include: thread diameter, pitch, thread start point, thread end point, thread lead-in amount, feed angle, length of the first straight path, length and height of the first inclined line, length and height of the second inclined line, and thread cutting depth each time. According to the machining drawing annotation, the size values of the thread diameter, the pitch, the thread start point, and the thread end point are filled into the corresponding variable input boxes, so that the turning path corresponds to different size specifications of threads.

[0055] In one of the embodiments of the present application, the length of the first straight path is determined as P times of the pitch; wherein P is in the range of 0.5-2.

[0056] In one of the embodiments of the present application, the length of the first inclined line and the length of the second inclined line are 40%-60% of the length of the first straight path; the height of the first inclined line and the height of the second inclined line are 2.5-3 times of the thread cutting depth. Other size parameters are set to default values, which are summarized from actual test experience and can not be modified. Different specifications of workpieces have corresponding default parameters.

[0057] In one of the embodiments of the present application, the step of drawing the composite path and the second straight path of the tool cutting path in the lathe coordinate system and defining the sizes in the composite path and the second straight path as variable parameters specifically includes: In the lathe coordinate system, the composite path and the second straight path of the tool cutting path are drawn in the CAM software, and the sizes in the composite path and the second straight path are defined as variable parameters. After the parameter filling is completed, the CAM software will automatically update the turning path; After the step of controlling the tool to move along the composite path to the end point and then controlling the tool to move along the X-axis depth direction on the composite path on the workpiece to the second straight path, i.e., after step S4, the process of converting the cutting path into a numerical control program is further included: S51, output numerical control program header instruction; S52, read coordinate data of each point of the cutting path; S53, convert each coordinate point into G code instruction and output; S54, output numerical control program tail instruction; S55, form a numerical control program file.

[0058] In the embodiment, the steps S51 to S55 are path post-processing steps. After the turning path is generated, the coordinate points on the path need to be converted into numerical control program so as to control the machine tool to complete the machining action, and the conversion process needs to be completed by post-processing. The post-processing function of the general CAM software cannot meet the processing requirements of the turning path in the application, and therefore secondary development needs to be carried out on the basis of the post-processing function. The secondary development content includes: defining the head and tail contents and formats of the numerical control program, defining the coordinate point motion G code, and defining the numerical control program formats such as txt (Chinese full name: text file format; English full name: Text File Format), NC (Chinese full name: numerical control program file; English full name: Numerical Control Program), and the like. After the secondary development is completed, the CAM software can have the special post-processing function for intermittent thread turning. After the numerical control program file is input into the lathe numerical control system, the lathe can execute the numerical control program one by one to control the cutter to move along the turning path described above, complete the thread turning, and periodically disconnect the chips during the turning process to achieve the chip breaking purpose.

[0059] Figure 14 An example of a schematic diagram of a physical structure of an electronic device is shown in Figure 14 The electronic device can include a processor 810, a communications interface 820, a memory 830, and a communications bus 840, wherein the processor 810, the communications interface 820, and the memory 830 complete mutual communication through the communications bus 840. The processor 810 can call the logical instructions in the memory 830 to execute the thread intermittent turning control method of the application, and the method includes: S1, establishing a lathe coordinate system and determining that the X axis is a vertical axis; S2, controlling the feed path to be inclined at a preset angle along the X axis of the machine tool coordinate system; S3, controlling the tool to move along the X axis depth direction on the workpiece to be a composite path, and the composite path includes: a first straight line path, a first inclined line inclined upward, and a second inclined line inclined downward connected in sequence; S4, after the tool moves to the end point along the composite path, controlling the tool to move along the X axis depth direction on the workpiece to be a second straight line path on the line of the composite path; and the steps S51 to S55.

[0060] Further, the logic instructions in the memory 830 described above can be implemented in the form of software functional units and sold or used as standalone products, and can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application essentially or partially contribute to the prior art, or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various media that can store program codes.

[0061] In another aspect, the present application also provides a computer program product, which comprises a computer program, the computer program can be stored on a non-transitory computer readable storage medium, and the computer program can be executed by a processor to enable a computer to perform the thread intermittent turning control method provided by the above-mentioned methods, the method comprising: S1, establishing a lathe coordinate system and determining that the X axis is a vertical axis; S2, controlling the feed path to be inclined at a preset angle along the X axis of the machine tool coordinate system; S3, controlling the tool to move along the X axis depth direction on the workpiece to be a composite path, the composite path comprising: a first straight line path, a first inclined line inclined upward, and a second inclined line inclined downward connected in sequence; S4, after the tool moves to the end point along the composite path, controlling the tool to move along the X axis depth direction on the workpiece to be a second straight line path on the line of the composite path; and steps S51 to S55.

[0062] In another aspect, the present application also provides a non-transitory computer readable storage medium, which stores a computer program, the computer program is executed by a processor to implement the thread intermittent turning control method provided by the above-mentioned methods, the method comprising: S1, establishing a lathe coordinate system and determining that the X axis is a vertical axis; S2, controlling the feed path to be inclined at a preset angle along the X axis of the machine tool coordinate system; S3, controlling the tool to move along the X axis depth direction on the workpiece to be a composite path, the composite path comprising: a first straight line path, a first inclined line inclined upward, and a second inclined line inclined downward connected in sequence; S4, after the tool moves to the end point along the compound path, the tool is controlled to move along a second straight line path in the depth direction of the X axis on the line of the compound path of the tool on the workpiece; and steps S51 to S55.

[0063] The device embodiments described above are merely illustrative, wherein the units described as separate components can or can not be physically separated, and the components displayed as units can or can not be physical units, i.e., can be located in one place or distributed on multiple network units. Part or all of the modules can be selected to achieve the purpose of the embodiment scheme according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0064] From the above description of the embodiments, those skilled in the art can clearly understand that the embodiments can be realized by means of software and the necessary general hardware platform, and of course can also be realized by hardware. Based on such understanding, the above technical solutions can be embodied in the form of a software product, which can be stored in a computer readable storage medium, such as a ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute the methods described in each embodiment or some parts of the embodiments.

[0065] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A thread interrupted turning control method characterized by, The method comprises the following steps: S1, establishing a lathe coordinate system and determining the X axis as a vertical axis; S2, controlling the feed path to be inclined at a preset angle along the X axis of the machine tool coordinate system; S3, controlling the tool to move along the X axis depth direction on the workpiece as a composite path, which comprises a first straight line path, an upward inclined first inclined line and a downward inclined second inclined line connected in sequence; S4, after the tool moves to the end point along the composite path, controlling the tool to move along the X axis depth direction on the workpiece as a second straight line path on the line of the composite path.

2. The thread intermittent turning control method according to claim 1, characterized by, The step of controlling the feed path to be inclined at a preset angle along the X axis of the machine tool coordinate system comprises: controlling the feed path to be inclined at an angle of 20°-29° along the X axis of the machine tool coordinate system.

3. The thread intermittent turning control method according to claim 1, characterized by, The height H of the first inclined line and / or the second inclined line satisfies: H>h(1+tan(α) / tan30°); wherein h represents the depth of the tool along the first straight line path; α represents the preset angle of the feed path inclined along the X axis of the machine tool coordinate system.

4. The thread intermittent turning control method according to claim 3, characterized by, The angle of α ranges from 20° to 29°.

5. The thread intermittent turning control method according to claim 1, characterized by, The start point and end point of the second straight line path are the same as those of the composite path; the depth of the second straight line path is the same as that of the first straight line path.

6. The thread intermittent turning control method according to any one of claims 1 to 5, characterized by, After the step of establishing the lathe coordinate system and determining the X axis as a vertical axis, the method further comprises the following steps: in the lathe coordinate system, drawing the composite path and the second straight line path of the tool movement path, and defining the dimensions in the composite path and the second straight line path as variable parameters.

7. The thread intermittent turning control method according to claim 6, characterized by, The dimensions in the composite path and the second straight line path comprise: thread diameter, pitch, thread start point, thread end point, thread lead-in amount, feed angle, length of the first straight line path, length and height of the first inclined line, length and height of the second inclined line, and thread cutting depth each time.

8. The thread intermittent turning control method according to claim 7, characterized by, The length of the first straight line path is a multiple of P of the pitch; wherein P ranges from 0.5 to 2.

9. The thread intermittent turning control method according to claim 7, characterized by, The length of the first inclined line and the length of the second inclined line are 40%-60% of the length of the first straight line path; the height of the first inclined line and the height of the second inclined line are 2.5-3 times the thread cutting depth.

10. The thread intermittent turning control method according to claim 6, characterized by, The step of drawing the composite path and the second straight line path of the tool movement path in the lathe coordinate system and defining the dimensions in the composite path and the second straight line path as variable parameters comprises the following steps: in the lathe coordinate system, drawing the composite path and the second straight line path of the tool movement path in the CAM software, and defining the dimensions in the composite path and the second straight line path as variable parameters; After the step of controlling the tool to move along the X axis depth direction on the workpiece as a second straight line path on the line of the composite path after the tool moves to the end point along the composite path, the method further comprises the following steps of converting the tool movement path into a numerical control program: outputting a numerical control program header instruction; reading coordinate data of each point of the tool movement path; converting each coordinate point into a G code instruction and outputting the G code instruction; outputting a numerical control program tail instruction; forming a numerical control program file.

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