Gear cutting tool parameter control system and method thereof

Abstract

The invention relates to the technical field of tool control, in particular to a tooth cutting tool parameter control system and method, and the system comprises a modeling module which is used for obtaining a tooth cutting tool model and a to-be-machined part model, and building a geometric cutting model based on tooth cutting tool operation parameters and part operation parameters; the processing module is used for acquiring the chip volume generated at each moment in the whole machining process based on a geometric cutting model, and acquiring the theoretical chip mass generated at each time point in combination with a to-be-machined part material; the control module is used for monitoring the cutting quality, obtaining the actual cutting quality generated at each time point, comparing the theoretical cutting quality with the actual cutting quality, and adjusting the running parameters of the tooth cutting tool when the deviation between the theoretical cutting quality and the actual cutting quality is larger than or equal to a threshold value. According to the invention, the processing accuracy of the part can be monitored in real time, the tooth cutting tool is regulated and controlled in real time based on the monitoring result, and the efficient and accurate tooth cutting processing of the part is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of tool control, and in particular to a gear cutting tool parameter control system and method thereof. Background Art

[0002] Gear cutting technology is a new type of cylindrical gear processing method, which is mainly aimed at the processing of non-through, non-recessed internal helical teeth that cannot be completed by traditional gear processing methods. This technology plays an important role in the demand for special structure gears in industries such as aviation, aerospace, automobile, and wind energy. Gear cutting is characterized by dry, intermittent and micro-cutting, and has the advantages of continuity, high efficiency, and high precision.

[0003] The principle of gear cutting is based on the meshing principle of staggered helical cylindrical gears, and is defined by the realization of gear cutting, the formation and discharge of chips, etc. The motion required for gear cutting includes the rotation of the workpiece and the tool, as well as the continuous axial relative motion and intermittent radial relative motion of the tool relative to the workpiece. Therefore, the control of the gear cutting tool is very important and directly affects the gear accuracy of gear cutting.

[0004] The existing gear cutting tool control usually sets parameters such as tool speed, cutting depth and feed rate in advance through CNC programming software. However, in the actual gear cutting process, due to factors such as equipment vibration and processing temperature, there may be errors between the actual parameters of the gear cutting tool and the set parameters. Therefore, it is usually necessary to control the gear cutting tool parameters in real time to ensure that the entire gear cutting process is carried out efficiently and accurately. Therefore, a control system and control method for real-time control of the gear cutting tool during the gear cutting process are proposed. Summary of the invention

[0005] To solve the above problems, the present invention provides a gear cutting tool parameter control system and method thereof, which are used to control the gear cutting tool in real time according to the actual gear cutting processing conditions during the gear cutting process to ensure that the entire gear cutting process is carried out efficiently and accurately.

[0006] In order to achieve the above object, the technical solution of the present invention is as follows: On the one hand, a gear cutting tool parameter control system is provided, comprising: A modeling module is used to obtain a gear cutting tool model and a part model to be processed, obtain operating parameters of the gear cutting tool and the part operating parameters, and establish a geometric cutting model based on the operating parameters of the gear cutting tool and the part operating parameters; A processing module is used to obtain the chip volume generated at each moment in the entire machining process based on the geometric cutting model, and to obtain the theoretical chip mass generated at each time point in combination with the material of the part to be machined; The control module is used to monitor the chip quality, obtain the actual chip quality generated at each time point, compare the theoretical chip quality with the actual chip quality, and adjust the operating parameters of the tooth cutting tool when the deviation between the theoretical chip quality and the actual chip quality is greater than or equal to a threshold.

[0007] Furthermore, the processing module is used to obtain the theoretical chip mass generated at each time point under different gear cutting tool operation parameters, and establish a mapping relationship between the gear cutting tool operation parameters and the theoretical chip mass generated at each time point; The control module is used to obtain the time point when the deviation between the theoretical chip quality and the actual chip quality is greater than or equal to the threshold value, and use it as the verification time point. Based on the actual chip quality and the verification time point, a comparison is performed in the mapping relationship between the gear cutting tool operating parameters and the theoretical chip quality generated at each time point, the deviation item and deviation amount of the gear cutting tool operating parameters are obtained, and the gear cutting tool operating parameters are adjusted.

[0008] Furthermore, the processing module is used to receive the allowable values ​​of the gear cutting tool operating parameters set by the user, and based on the allowable values ​​of the gear cutting tool operating parameters and the geometric cutting model, obtain the chip volume generated at each moment under different gear cutting tool operating parameters within the allowable value range of the gear cutting tool operating parameters, obtain the theoretical chip mass generated at each time point under different gear cutting tool operating parameters in combination with the material of the part to be processed, and establish a mapping relationship between the gear cutting tool operating parameters and the theoretical chip mass generated at each time point.

[0009] Furthermore, the processing module is used to obtain the operating parameters of the gear cutting tool, and receive the allowable offset set by the user, and add the allowable offset to the operating parameters of the gear cutting tool to obtain the allowable value of the operating parameters of the gear cutting tool.

[0010] Further, the control module includes a chip metering unit, and the chip metering unit includes a metering box; The metering box is connected to a retractable pipe, one end of the retractable pipe away from the metering box is connected to an air amplifier, an air outlet of the air amplifier is close to the retractable pipe, and a compressed air inlet of the air amplifier is connected to an adjustable high-pressure air source; A plurality of exhaust holes are provided on the side wall of the metering box away from the telescopic pipe; A weighing mechanism for weighing the quality of the chips is arranged at the bottom of the metering box.

[0011] Further, the weighing mechanism includes a metering tank arranged in the metering box, the bottom of the metering tank is rotatably connected to a carrying plate, a driving member for driving the carrying plate to rotate is arranged in the side wall of the metering tank, a weighing sensor is fixedly connected to the surface of the carrying plate, and the weighing plate is fixedly connected to the surface of one end of the weighing sensor away from the carrying plate; The control module is used to obtain the weight information collected by the weighing sensor, so as to obtain the actual chip mass generated at each time point.

[0012] Furthermore, the number of metering slots is several, and the several metering slots are arranged in sequence along the air flow direction in the metering box, and different metering slots are used to collect chips of different volumes; The processing module is used to obtain the chip volume generated at each moment in the entire machining process based on the geometric cutting model, classify the chip volume into types based on the metering grooves, the number of types of chip volume classification corresponds to the number of metering grooves, and calculate the theoretical chip mass of various volumes generated at each time point in the entire machining process; The control module is used to obtain the chip mass collected by the weighing sensor corresponding to each metering slot, so as to obtain the actual chip mass of various volumes generated at various time points in the entire processing process, and compare the actual chip mass and theoretical chip mass of various types of volumes. When the deviation between the actual chip mass and the theoretical chip mass of any type of volume is greater than or equal to the threshold, the operating parameters of the tooth cutting tool are adjusted.

[0013] Furthermore, the side walls of the metering tank are all inclined structures.

[0014] Furthermore, the theoretical chip quality change curves generated in each time period under different gear-scraping tool operation parameters are obtained; The processing module is used to obtain the actual chip mass change curve generated in each time period, and compare the theoretical chip mass change curve of each time period with the actual chip mass change curve in the entire processing process. When the deviation between the theoretical chip mass change curve and the actual chip mass change curve in the same time period is greater than or equal to a threshold, the deviation item and deviation amount of the gear cutting tool operating parameters are obtained based on the theoretical chip mass change curve and the actual chip mass change curve, and the gear cutting tool operating parameters are adjusted.

[0015] On the other hand, a method for controlling parameters of a tooth cutting tool is provided, comprising the following steps: Acquire a gear cutting tool model and a part model to be processed, acquire operating parameters of the gear cutting tool and the part operating parameters, and establish a geometric cutting model based on the operating parameters of the gear cutting tool and the part operating parameters; Based on the geometric cutting model, the chip volume generated at each moment in the entire machining process is obtained, and the theoretical chip mass generated at each time point is obtained in combination with the material of the part to be machined; The chip quality is monitored to obtain the actual chip quality generated at each time point, and the theoretical chip quality is compared with the actual chip quality. When the deviation between the theoretical chip quality and the actual chip quality is greater than or equal to the threshold, the operating parameters of the tooth cutting tool are adjusted.

[0016] The technical principles of the above scheme are as follows: During the gear cutting process, both the tool and the workpiece are in operation, and it is difficult to obtain the actual processing conditions between the tool and the workpiece in real time during this process. However, based on the geometric cutting model, it is possible to confirm the accumulated chip mass at each time point during the gear cutting process, or the chip mass generated in each time period, or the change in chip mass in each time period when precise processing is performed according to the preset parameters, so that theoretical budgeting and actual monitoring can be performed. By obtaining the theoretical quantity / value and actual quantity / value of the above items, it is possible to compare whether there is any deviation in the current gear cutting process. By estimating the chip changes caused by the gear cutting tool operating parameters under non-set values, the deviations in the gear cutting tool operation process, that is, the deviation items and deviation amounts, can be estimated based on the actual chip conditions obtained, so that the operation of the gear cutting tool can be controlled in real time to ensure accurate gear cutting.

[0017] The above scheme has the following beneficial effects: 1. The present invention constructs a geometric cutting model through the parameters of the tooth-cutting tool and the parameters of the part to be processed. Based on the geometric cutting model, the theoretically predicted chip quality at each time point during the entire processing of the part can be obtained; and the actual chip quality generated at each time point can be monitored. By comparing the theoretically predicted chip quality with the actual chip quality, it is determined whether there is a deviation in the processed part, and whether the tool operation parameters need to be adjusted. Compared with the prior art, the part processing accuracy can be monitored in real time, and the tooth-cutting tool can be adjusted in real time based on the monitoring results to ensure that the parts are processed efficiently and accurately.

[0018] 2. The present invention predicts the chip quality generated under different gear cutting tool parameters. Therefore, when the gear cutting tool parameters need to be adjusted during the gear cutting process, the deviation between the actual chip quality and the chip quality generated by the predicted theory can be used to obtain the deviation term and the deviation amount, thereby achieving accurate adjustment of the gear cutting tool.

[0019] 3. The present invention obtains and compares the mass change curve generated by the chip theory during the gear cutting process and the mass change curve actually generated, so as to monitor whether there is a deviation trend of the gear cutting tool during the gear cutting process, and timely control the gear cutting tool when there may be a deviation trend, so as to ensure the accuracy of the gear cutting process of the parts.

[0020] 4. The present invention obtains the theoretical chip mass and actual chip mass of various volumes generated at various time points during the gear cutting process. When there is an error in the actual chip mass of any type of volume, the gear cutting tool is regulated to improve the accuracy of monitoring the gear cutting tool, so as to perform high-precision control of the gear cutting tool.

[0021] 5. The present invention uses a chip metering unit to efficiently collect chips generated during the gear cutting process. The chip metering unit is suitable for dry processing technologies such as gear cutting processing. It can effectively collect chips generated during the gear cutting process, while reducing interference caused by the failure to remove chips in time to the gear cutting process of parts, and has a certain cooling effect on the processing surface of the parts.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of an embodiment of a gear cutting tool parameter control system and method thereof of the present invention; Figure 2 It is a schematic diagram of an embodiment of a gear cutting tool parameter control system and method thereof of the present invention; Figure 3 It is a schematic diagram of an embodiment of a gear cutting tool parameter control system and method thereof of the present invention; Figure 4 It is a schematic diagram of an embodiment of a gear cutting tool parameter control system and method thereof of the present invention; Figure 5 It is a schematic diagram of an embodiment of a gear cutting tool parameter control system and method thereof of the present invention; Figure 6 It is a schematic diagram of an embodiment of a gear cutting tool parameter control system and method thereof of the present invention.

[0024] The figure marks in the drawings of the specification include: 1. metering box; 2. retractable pipe; 3. air amplifier; 4. mounting base; 5. metering plate; 6. filter screen; 7. metering trough; 8. discharge trough; 9. weighing sensor; 10. load-bearing plate. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] The following is further described in detail through specific implementation methods: Embodiment 1, as Figure 1 As shown: a gear cutting tool parameter control system is mainly composed of a modeling module, a processing module and a control module, wherein the modeling module is mainly used for basic data acquisition and geometric cutting model establishment of gear cutting processing, the processing module is used to estimate the chip quality of the workpiece during the gear cutting processing based on the geometric cutting model, and the control module controls the gear cutting tool based on the actual monitored chip quality of the workpiece during the gear cutting processing, so as to achieve the purpose of real-time monitoring of workpiece quality and efficient and accurate control of the gear cutting tool.

[0029] The following is a detailed explanation of the functions of each module: The modeling module is used to obtain the gear cutting tool model and the part model to be processed, obtain the gear cutting tool operating parameters and the part operating parameters, and establish a geometric cutting model based on the gear cutting tool operating parameters and the part operating parameters.

[0030] Specifically, first, establish the gear cutting motion coordinate system: The gear cutting process involves three kinds of motion: the rotation of the workpiece , the rotary motion of the tool and feed motion along the workpiece axis During the movement of the tool and the workpiece, the tool axis and the workpiece axis always maintain an axial angle The difference between cutting internal gear workpieces and external gear workpieces lies in the center distance value and the direction of the tool axis.

[0031] Establish the coordinate systems of the cutting motion, such as Figure 2 Coordinate system is the workpiece coordinate system, where the unit vector is ; Coordinate system is the tool coordinate system, where the unit vector is ; Coordinate system Is the coordinate system The auxiliary coordinate system of , where the unit vector is ; Coordinate system Is the coordinate system The auxiliary coordinate system of , where the unit vector is .

[0032] Coordinate system Used to establish the workpiece tooth surface model, coordinate system Used to establish tool model, auxiliary coordinate system and The spatial position of is fixed and does not change over time. Indicates the vertical distance between the tool axis and the workpiece axis, the axis angle Represents the angle between the tool axis and the workpiece axis. Representing coordinate system As the workpiece rotates relative to the 0-second position, Representing coordinate system Relative to the auxiliary coordinate system Along the workpiece axis ( The distance moved in the positive direction of the axis, Representing coordinate system The angle as the tool rotates relative to the time 0 position.

[0033] The edge sweep is the cutting edge in the workpiece coordinate system The swept surface is formed in the tool coordinate system, while the cutting edge of the tooth cutting tool is usually in the tool coordinate system In order to express the blade sweep surface, the workpiece coordinate system To establish a chip model in , coordinate system conversion is required. To coordinate system The transformation matrix is:

[0034] Each matrix in the formula is a coordinate transformation matrix:

[0035]

[0036]

[0037] In the formula, Representing coordinate system To coordinate system The transformation matrix, Representing coordinate system To coordinate system The transformation matrix, Representing coordinate system To coordinate system The transformation matrix of . and Respectively represent the angular velocity of the workpiece and tool during the cutting process, Represents the displacement of the workpiece or tool along the axial direction of the workpiece.

[0038] and Represent the number of teeth of the workpiece and tool respectively, satisfying:

[0039]

[0040] Then, create a blade sweep model: In order to obtain the blade scanning model, it is necessary to transform the tool coordinate system into The cutting edge in the workpiece coordinate system is transformed into the workpiece coordinate system middle:

[0041] In the formula, express Point on the cutting edge, Indicates the tool coordinate system Middle The distance from a point on the cutting edge of a blade sweep to the tool axis, , , Respectively In the tool coordinate system middle axis, axis, Component in the direction of the axis. Transform the cutting edge into the workpiece coordinate system According to formula (8), the blade sweep surface can be obtained:

[0042] In the formula, express The point on the middle blade sweep surface, Indicates the coordinate system from the tool To workpiece coordinate system The transformation matrix of . Equation (8) can be expanded to obtain the parameter equation of the blade scanning surface:

[0043] In the formula,

[0044] Then, create a blade sweep family model: A certain tooth first contacts and scrapes a tooth groove of the workpiece to perform the first edge sweep process. Suppose this tooth is tooth No. 1. The edge sweep surface generated by relative motion The time for sweeping the tooth groove is After the workpiece rotates one circle, The blade sweeps the tooth groove, i.e., the second blade sweep process, the blade sweeps the surface of the tooth groove relative to the blade. The sweep time is , according to the periodicity of the scraping process, the following relationship is satisfied:

[0045] In the formula, represents the remainder, from which we can conclude that when the workpiece rotates Week later, Second blade sweeping process, blade sweeping surface Contact tooth groove The time is to meet ,satisfy

[0046] According to the above formula, it can be deduced that when the workpiece rotates Week later, first tooth cutting The 1st and 2nd teeth Secondary cutting of tooth groove of The angle between the teeth is:

[0047] Combining formulas (7) and (13), we can get the tooth cutter The parameter equation of the cutting edge on the cutter tooth:

[0048] Combining formulas (8) and (14), The parameter equation of the blade sweep formed by the secondary cutting tooth groove is as follows:

[0049] In the formula,

[0050] According to equations (15) and (16), several blade sweeps can be calculated, and their collection constitutes a blade sweep family.

[0051] Then, expand the chip modeling: Combined with the chip generation process analysis, the developed chip in the complete cutting state is a spatial geometric body surrounded by three surfaces, namely the tooth surface to be processed (the first in the family of the previous cutting edge) and the The machined tooth surface is composed of 3 blade sweeping surfaces (The first The blade sweeps of this machining process are composed of Blade sweep . Through discrete cutting edges , by combining equations (15) and (17), we can solve the coordinates of the intersection point with the surface during the blade sweep process of any blade point, that is, , , , and then the intersection lines A, B, and C of the three surfaces are obtained by curve fitting method, that is, the boundary lines of the unfolded geometric chips. Based on this, the boundary positions of the machined tooth surface, the tooth surface to be machined, and the edge sweep surface that constitute the chip contour are determined respectively to establish a three-dimensional chip geometry model.

[0052]

[0053] The processing module is used to obtain the chip volume generated at each moment in the entire machining process based on the geometric cutting model, and to obtain the theoretical chip mass generated at each time point in combination with the material of the part to be machined.

[0054] Specifically, the processing module is used to obtain the theoretical chip mass generated at each time point under different gear cutting tool operating parameters, and establish a mapping relationship between the gear cutting tool operating parameters and the theoretical chip mass generated at each time point. Among them, the gear cutting tool operating parameters mainly include tool speed, cutting depth and feed rate. When obtaining the theoretical chip mass generated at each time point under different gear cutting tool parameters, this embodiment is performed according to the following method: First, one of the three is controlled as a variable, and the other two are controlled as quantitative. The variable changes within the allowable value range of the gear cutting tool operating parameter set by the user. The allowable value of the gear cutting tool operating parameter is mainly obtained by the processing module receiving the user's setting information. Specifically, the gear cutting tool operating parameter is obtained, and the allowable offset set by the user is received, and the allowable offset is superimposed on the gear cutting tool operating parameter to obtain the allowable value of the gear cutting tool operating parameter.

[0055] Then, based on the allowable values ​​of the gear cutting tool operating parameters and the geometric cutting model, within the allowable value range of the gear cutting tool operating parameters, the chip volume generated at each moment under different gear cutting tool operating parameters is obtained, and the material of the part to be processed is obtained. After obtaining the chip volume and part material (chip material), the mass of the chips can be calculated.

[0056] For example, when the tool speed is set to 500 r / min, the cutting depth is 0.7 mm, and the feed rate is 0.2 mm / r during gear cutting processing; the user sets the allowable offset of the gear cutting tool speed to 20 r / min, which is superimposed on the set tool speed of 500 r / min to obtain the allowable value of the tool speed of 480 r / min (minimum) to 520 r / min (maximum). The processing module simulates the theoretical chip mass generated at each time point when the gear cutting tool speed is in the range of 480-500 r / min, the cutting depth is always 0.7 mm, and the feed rate is always 0.2 mm / r. That is, the theoretical chip mass generated at each time point at different speeds of the gear cutting tool in the range of 480-500 r / min is obtained, thereby obtaining the influence of a single tool speed change on the chip quality.

[0057] Based on the above principles, the effects of changes in single tool speed, cutting depth, and feed rate on chip quality are obtained in the following ways: (1) The processing module receives the allowable value of tool speed set by the user. Based on the allowable value of tool speed and the geometric cutting model, the processing module obtains the chip volume generated at each time under different tool speeds within the allowable value range of tool speed. The processing module obtains the theoretical chip mass generated at each time point under different tool speeds in combination with the material of the part to be processed, and establishes a mapping relationship between the tool speed and the theoretical chip mass generated at each time point.

[0058] (2) The processing module receives the allowable cutting depth set by the user. Based on the allowable cutting depth and the geometric cutting model, the processing module obtains the chip volume generated at each time point at different cutting depths within the allowable cutting depth range. The processing module obtains the theoretical chip mass generated at each time point at different cutting depths in combination with the material of the part to be processed, and establishes a mapping relationship between the cutting depth and the theoretical chip mass generated at each time point.

[0059] (3) The processing module receives the feed rate allowable value set by the user, and based on the feed rate allowable value and the geometric cutting model, obtains the chip volume generated at each time at different feed rates within the feed rate allowable value range. Combined with the material of the part to be processed, the theoretical chip mass generated at each time point at different feed rates is obtained, and a mapping relationship between the feed rate and the theoretical chip mass generated at each time point is established.

[0060] After the mapping relationship between chip quality and each time point is established when the above-mentioned single tool speed changes, cutting depth changes, and feed rate changes, it is also necessary to establish the mapping relationship between chip quality and each time point when any two or three gear-scraping tool operating parameters change based on the above principle, and use them together as the basis for subsequent gear-scraping tool control judgment.

[0061] The control module is used to monitor the chip quality, obtain the actual chip quality generated at each time point, compare the theoretical chip quality with the actual chip quality, and adjust the operating parameters of the gear cutting tool when the deviation between the theoretical chip quality and the actual chip quality is greater than or equal to the threshold (the threshold is set by the user, and the smaller the threshold, the more sensitive it is to the control of the gear cutting tool).

[0062] Specifically, when the tooth scraping tool performs tooth scraping on parts in full accordance with the preset machining program (the machining program generated by the CNC system), under ideal conditions, the chip mass generated at each time point or each time period is directly obtained based on the geometric cutting model, which is the theoretical chip mass; but in actual situations, the chip mass generated at each time point or each time period needs to be collected and measured to obtain the chips, which is the actual chip mass; when the deviation between the actual chip mass and the theoretical chip mass is greater than or equal to the threshold, it is most likely caused by the deviation in the operating parameters of the tooth scraping tool. Therefore, this embodiment uses the deviation between the actual chip mass and the theoretical chip mass as the basis for whether to adjust the operating parameters of the tooth scraping tool.

[0063] After judging that the gear cutting tool operating parameters need to be adjusted based on the deviation between the actual chip quality and the theoretical chip quality, the items to be adjusted and the amount to be adjusted need to be confirmed. Specifically, when the deviation between the theoretical chip quality and the actual chip quality is greater than or equal to the threshold, the time point when the deviation between the theoretical chip quality and the actual chip quality is greater than or equal to the threshold is obtained, and it is used as the verification time point. Based on the actual chip quality and the verification time point, a comparison is performed in the mapping relationship between the gear cutting tool operating parameters and the theoretical chip quality generated at each time point, and the deviation item (the item to be adjusted) and the deviation amount (the amount to be adjusted) of the gear cutting tool operating parameters are obtained, and the gear cutting tool operating parameters are adjusted.

[0064] This embodiment takes a single cutting depth deviation as an example: when the tool speed is set to 450 r / min, the cutting depth is 0.7 mm, and the feed rate is 0.2 mm / r during gear cutting; the user sets the allowable offset of the gear cutting tool cutting depth to be 0.05 mm, and the allowable value of the tool cutting depth is 0.65 mm (minimum) to 0.75 mm (maximum); the processing module simulates the theoretical chip mass generated at each time point when the gear cutting tool cutting depth is in the range of 0.65-0.75 mm, the speed is always 450 r / min, and the feed rate is 0.2 mm / r, obtains the influence of a single cutting depth change on the chip mass, and establishes a mapping relationship between the two: 10s after the start of processing - cutting depth 0.65 mm - theoretical chip mass 20.5g, 10s after the start of processing - cutting depth 0.66mm - theoretical chip mass 21.5g, 10s after the start of processing - cutting depth 0.67 mm-theoretical chip mass 22.5g...10s after the start of processing-cutting depth 0.7 mm-theoretical chip mass 25.5g, 10s after the start of processing-cutting depth 0.71 mm-theoretical chip mass 26.5g...10s after the start of processing-cutting depth 0.75 mm-theoretical chip mass 30.5g. The theoretical chip mass and actual chip mass deviation threshold is set to 1g, that is, when the chip depth of the gear cutting tool deviates from 0.7 mm to less than or equal to 0.69 mm or greater than or equal to 0.71 mm, the cutting depth of the gear cutting tool needs to be regulated. If the actual chip mass collected is 26.5g, the deviation value of the cutting depth of the gear cutting tool from 0.7 mm, 0.71mm, can be obtained based on the above mapping relationship. The control module is connected to the signal of the operating system of the gear cutting tool (the gear cutting tool control system of the gear cutting machine tool). The control module sends a corresponding control signal to regulate the cutting depth of the gear cutting tool from 0.71 mm to 0.7 mm, thereby completing the control of the gear cutting tool when a single cutting depth deviation occurs. When multiple gear cutting tool operating parameters deviate, the gear cutting tool is also controlled based on the above principle, thereby realizing real-time monitoring and regulation of the gear cutting tool operating quality.

[0065] like Figure 3 As shown, the gear cutting tool parameter control method corresponding to the gear cutting tool parameter control system of this embodiment includes the following steps: Acquire a gear cutting tool model and a part model to be processed, acquire operating parameters of the gear cutting tool and the part operating parameters, and establish a geometric cutting model based on the operating parameters of the gear cutting tool and the part operating parameters; Based on the geometric cutting model, the chip volume generated at each moment in the entire machining process is obtained, and the theoretical chip mass generated at each time point is obtained in combination with the material of the part to be machined; The chip quality is monitored to obtain the actual chip quality generated at each time point, and the theoretical chip quality is compared with the actual chip quality. When the deviation between the theoretical chip quality and the actual chip quality is greater than or equal to the threshold, the operating parameters of the tooth cutting tool are adjusted.

[0066] Embodiment 2, as Figure 3-Figure 6 As shown, this embodiment provides a metering unit for measuring the quality of chips generated during the gear cutting process, which belongs to the control module and is used to measure the chips in real time during the gear cutting process. It mainly includes a metering box 1, which is connected to a telescopic pipe 2. The telescopic pipe 2 of this embodiment is an aluminum foil corrugated pipe to prevent chips from repeatedly colliding with the inner wall of the telescopic pipe 2 during chip collection, causing damage to the telescopic pipe 2.

[0067] The end of the telescopic pipe 2 away from the metering box 1 is connected to an air amplifier 3, the air outlet of the air amplifier 3 is close to the telescopic pipe 2, and the compressed air inlet of the air amplifier 3 is connected to an adjustable high-pressure air source. By supplying high-pressure air to the compressed air inlet of the air amplifier 3, negative pressure suction can be generated at the air inlet of the air amplifier 3, and the chips generated by the gear cutting process can be collected into the metering box 1. This chip collection method is suitable for dry processing technology such as gear cutting processing.

[0068] A plurality of exhaust holes are provided on the side wall of the metering box 1 away from the telescopic pipe 2, and a filter screen 6 is arranged in the exhaust hole to prevent the chips collected in the metering box 1 from flowing out of the metering box 1 with the air. A weighing mechanism for weighing the chip mass is arranged at the bottom of the metering box 1.

[0069] The weighing mechanism includes a metering trough 7 arranged in the metering box 1, the bottom of the metering trough 7 is rotatably connected to a load-bearing plate 10, a driving member for driving the load-bearing plate 10 to rotate is arranged in the side wall of the metering trough 7, a weighing sensor 9 is fixedly connected to the surface of the load-bearing plate 10, and a metering plate 5 is fixedly connected to the surface of the weighing sensor 9 away from the end of the load-bearing plate 10, and the driving member preferably adopts a servo motor, and the end where the load-bearing plate 10 and the metering plate 5 are in contact with each other needs to adopt an arc surface structure to avoid interference between the two when rotating. In addition, the side walls of the metering trough 7 are all inclined structures to ensure that the chips fall on the metering plate 5. The control module is used to obtain the weight information collected by the weighing sensor 9, so as to obtain the actual chip mass produced at each time point, and can also obtain the actual chip mass produced within a certain period of time.

[0070] A mounting base 4 is fixedly connected to the bottom of the metering box 1, and a discharge groove 8 is provided in the mounting base 4. When the processing of a part is completed or the chip mass generated at one end of a part is measured, the metering plate 5 is driven to rotate by the driving member to connect the metering groove 7 with the discharge groove 8, thereby discharging the chips on the surface of the metering plate 5 into the discharge groove 8, so as to facilitate the subsequent measurement of the actual chip mass.

[0071] Embodiment 3, as Figure 3-Figure 6 As shown, there are three metering grooves 7, and the three metering grooves 7 are arranged in sequence along the air flow direction in the metering box 1. Different metering grooves 7 are used to collect chips of different volumes. From close to the telescopic pipe 2 to far away from the telescopic pipe 2, the volume of collected chips gradually decreases.

[0072] The processing module is used to obtain the chip volume generated at each moment in the entire processing process based on the geometric cutting model, and classify the chip volume based on the metering groove 7. The number of chip volume classification types corresponds to the number of metering grooves 7. For example: the chip volume collected by the metering groove 7 close to the telescopic pipe 2 is divided into one type of chips, the chip volume collected by the metering groove 7 far away from the telescopic pipe 2 is divided into three types of chips, and the chip volume collected by the metering groove 7 between the two is divided into two types of chips.

[0073] The processing module is used to calculate the theoretical chip mass of various volumes generated at each time point in the entire processing process based on the geometric cutting model in Example 1, that is, it is necessary to calculate the theoretical chip mass generated at each time point of Class I chips, Class II chips and Class III chips.

[0074] The control module is used to obtain the chip mass collected by the weighing sensor 9 corresponding to each metering slot 7, so as to obtain the actual chip mass of various volumes generated at various time points during the entire processing process, and compare the actual chip mass and theoretical chip mass of various types of volumes. When the deviation between the actual chip mass and the theoretical chip mass of any type of volume is greater than or equal to the threshold, the gear cutting tool operating parameters are adjusted. The comparison of the actual chip mass and the theoretical chip mass deviation and the adjustment of the gear cutting tool operating parameters after the comparison are the same as those in Example 1, and this embodiment will not be repeated. The difference from Example 1 is that after dividing the chip volume of each volume, it is possible to more sensitively monitor whether there is a deviation in the operating parameters of the gear cutting tool, which is convenient for efficiently and accurately adjusting the gear cutting tool operating parameters.

[0075] In embodiment 4, the processing module is used to obtain the theoretical chip mass change curve generated in each time period under different gear cutting tool operating parameters, which reflects the theoretical chip mass change of the gear cutting tool in the entire gear cutting process according to the set operating parameters.

[0076] The processing module is used to obtain the actual chip mass change curve generated in each time period, and compare the theoretical chip mass change curve of each time period with the actual chip mass change curve in the entire processing process, which reflects the actual chip mass change of the gear cutting tool in a certain time period.

[0077] The difference between the theoretical chip mass and the actual chip mass should be small, and the change curves of the two should also have a high degree of overlap. When the deviation between the theoretical chip mass change curve and the actual chip mass change curve in the same time period is greater than or equal to the threshold, it indicates that there may be a deviation in the operating parameters of the gear cutting tool, and the change curves of the two can reflect the trend of the deviation of the operating parameters of the gear cutting tool to a certain extent. Therefore, the deviation item and deviation amount of the operating parameters of the gear cutting tool are obtained based on the theoretical chip mass change curve and the actual chip mass change curve, and the operating parameters of the gear cutting tool are adjusted. The monitoring method of the gear cutting tool in this embodiment is different, but the adjustment method after detecting that the operating parameters of the gear cutting tool need to be adjusted is similar.

[0078] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A tooth cutting tool parameter control system, characterized in that: include: A modeling module is used to obtain a gear cutting tool model and a part model to be processed, obtain operating parameters of the gear cutting tool and the part operating parameters, and establish a geometric cutting model based on the operating parameters of the gear cutting tool and the part operating parameters; A processing module is used to obtain the chip volume generated at each moment in the entire machining process based on the geometric cutting model, and to obtain the theoretical chip mass generated at each time point in combination with the material of the part to be machined; The control module is used to monitor the chip quality, obtain the actual chip quality generated at each time point, compare the theoretical chip quality with the actual chip quality, and adjust the operating parameters of the tooth cutting tool when the deviation between the theoretical chip quality and the actual chip quality is greater than or equal to a threshold.

2. The tooth cutting tool parameter control system according to claim 1, characterized in that: The processing module is used to obtain the theoretical chip mass generated at each time point under different gear cutting tool operation parameters, and establish a mapping relationship between the gear cutting tool operation parameters and the theoretical chip mass generated at each time point; The control module is used to obtain the time point when the deviation between the theoretical chip quality and the actual chip quality is greater than or equal to the threshold value, and use it as the verification time point. Based on the actual chip quality and the verification time point, a comparison is performed in the mapping relationship between the gear cutting tool operating parameters and the theoretical chip quality generated at each time point, the deviation item and deviation amount of the gear cutting tool operating parameters are obtained, and the gear cutting tool operating parameters are adjusted.

3. The gear cutting tool parameter control system according to claim 2, characterized in that: The processing module is used to receive the allowable values ​​of the gear cutting tool operating parameters set by the user, and based on the allowable values ​​of the gear cutting tool operating parameters and the geometric cutting model, obtain the chip volume generated at each moment under different gear cutting tool operating parameters within the allowable value range of the gear cutting tool operating parameters, obtain the theoretical chip mass generated at each time point under different gear cutting tool operating parameters in combination with the material of the part to be processed, and establish a mapping relationship between the gear cutting tool operating parameters and the theoretical chip mass generated at each time point.

4. The gear cutting tool parameter control system according to claim 3, characterized in that: The processing module is used to obtain the operating parameters of the gear cutting tool, receive the allowable offset set by the user, and add the allowable offset to the operating parameters of the gear cutting tool to obtain the allowable value of the operating parameters of the gear cutting tool.

5. The gear cutting tool parameter control system according to claim 1, characterized in that: The control module comprises a chip metering unit, and the chip metering unit comprises a metering box (1); The metering box (1) is connected to a retractable pipe (2), one end of the retractable pipe (2) away from the metering box (1) is connected to an air amplifier (3), an air outlet of the air amplifier (3) is close to the retractable pipe (2), and a compressed air inlet of the air amplifier (3) is connected to an adjustable high-pressure air source; A plurality of exhaust holes are provided on a side wall of one end of the metering box (1) away from the telescopic pipe (2); A weighing mechanism for weighing the mass of the chips is arranged at the bottom of the metering box (1).

6. The gear cutting tool parameter control system according to claim 5, characterized in that: The weighing mechanism comprises a metering trough (7) arranged in the metering box (1), the bottom of the metering trough (7) is rotatably connected to a carrying plate (10), a driving member for driving the carrying plate (10) to rotate is arranged in the side wall of the metering trough (7), a weighing sensor (9) is fixedly connected to the surface of the carrying plate (10), and the surface of one end of the weighing sensor (9) away from the carrying plate (10) is fixedly connected to the metering plate (5); The control module is used to obtain weight information collected by the weighing sensor (9), thereby obtaining the actual chip mass generated at each time point.

7. The gear cutting tool parameter control system according to claim 6, characterized in that: There are a plurality of metering grooves (7), and the plurality of metering grooves (7) are arranged in sequence along the air flow direction in the metering box (1), and different metering grooves (7) are used to collect chips of different volumes; The processing module is used to obtain the chip volume generated at each moment in the entire machining process based on the geometric cutting model, classify the chip volume into types based on the metering grooves (7), the number of types of chip volume classification corresponds to the number of metering grooves (7), and calculate the theoretical chip mass of various volumes generated at each time point in the entire machining process; The control module is used to obtain the chip mass collected by the weighing sensor (9) corresponding to each metering slot (7), thereby obtaining the actual chip mass of various volumes generated at various time points during the entire processing process, comparing the actual chip mass of various types of volumes with the theoretical chip mass, and adjusting the operating parameters of the tooth cutting tool when the deviation between the actual chip mass and the theoretical chip mass of any type of volume is greater than or equal to a threshold.

8. The gear cutting tool parameter control system according to claim 7, characterized in that: The side walls of the metering groove (7) are all inclined structures.

9. The gear cutting tool parameter control system according to claim 2, characterized in that: The processing module is used to obtain the theoretical chip quality change curve generated in each time period under different gear cutting tool operation parameters; The processing module is used to obtain the actual chip mass change curve generated in each time period, and compare the theoretical chip mass change curve of each time period with the actual chip mass change curve in the entire processing process. When the deviation between the theoretical chip mass change curve and the actual chip mass change curve in the same time period is greater than or equal to a threshold, the deviation item and deviation amount of the gear cutting tool operating parameters are obtained based on the theoretical chip mass change curve and the actual chip mass change curve, and the gear cutting tool operating parameters are adjusted.

10. A method for controlling parameters of a tooth-scraping tool, characterized in that: The steps include: Acquire a gear cutting tool model and a part model to be processed, acquire operating parameters of the gear cutting tool and the part operating parameters, and establish a geometric cutting model based on the operating parameters of the gear cutting tool and the part operating parameters; Based on the geometric cutting model, the chip volume generated at each moment in the entire machining process is obtained, and the theoretical chip mass generated at each time point is obtained in combination with the material of the part to be machined; The chip quality is monitored to obtain the actual chip quality generated at each time point, and the theoretical chip quality is compared with the actual chip quality. When the deviation between the theoretical chip quality and the actual chip quality is greater than or equal to the threshold, the operating parameters of the tooth cutting tool are adjusted.

Images