A parameter control system and method for a shaving cutter

Abstract

The present invention relates to the technical field of tool control, and particularly relates to a parameter control system and method for a face hobbing tool. The system includes a modeling module for obtaining a face hobbing tool model and a part model to be machined, and establishing a geometric cutting model based on the operating parameters of the face hobbing tool and the operating parameters of the part; a processing module for obtaining the chip volume generated at each moment during the entire machining process based on the geometric cutting model, and obtaining the theoretical chip mass generated at each time point in combination with the material of the part to be machined; a control module for monitoring the chip mass, obtaining the actual chip mass generated at each time point, comparing the theoretical chip mass and the actual chip mass, and adjusting the operating parameters of the face hobbing tool when the deviation between the theoretical chip mass and the actual chip mass is greater than or equal to a threshold. The present invention can monitor the machining accuracy of parts in real time, and perform real-time regulation on the face hobbing tool based on the monitoring results to ensure efficient and accurate face hobbing machining of parts.

Description

Technical Field

[0001] The present invention relates to the technical field of tool control, and particularly to a parameter control system and method for a shaving cutter. Background Art

[0002] The shaving machining technology is a new type of cylindrical gear machining method, which mainly aims at the machining problems of non-through and internal helical teeth without a relief groove that cannot be completed by traditional gear machining methods. This technology plays an important role in the demand for special structure gears in industries such as aviation, aerospace, automotive, and wind energy. The characteristics of shaving machining are dry, intermittent, and micro-cutting, with advantages such as continuity, high efficiency, and high precision.

[0003] The principle of shaving machining is defined based on the meshing principle of crossed-axis helical cylindrical gears, through the realization of gear cutting machining, the formation and discharge of chips, etc. The motions required for shaving machining include the rotational motions 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 shaving cutter is crucial and directly affects the gear accuracy of shaving machining.

[0004] The existing control of shaving cutters usually sets parameters such as tool rotation speed, cutting depth, and feed rate in advance through numerical control programming software. However, during the actual shaving machining process, due to factors such as equipment vibration and machining temperature, there may be errors between the actual parameters and the set parameters of the shaving cutter. Therefore, it is usually necessary to perform real-time control of the shaving cutter parameters to ensure the efficient and accurate progress of the entire shaving machining process. Therefore, a control system and control method for real-time control of shaving cutters during the shaving machining process are proposed. Summary of the Invention

[0005] To solve the above problems, the present invention provides a parameter control system and method for a shaving cutter, which is used to control the shaving cutter in real time according to the actual shaving machining situation during the shaving machining process to ensure the efficient and accurate progress of the entire shaving machining process.

[0006] To achieve the above object, the technical solution of the present invention is as follows:

[0007] On the one hand, a parameter control system for a shaving cutter is provided, including:

[0008] A modeling module, which is used to obtain a shaving cutter model and a part model to be machined, obtain the operating parameters of the shaving cutter and the operating parameters of the part, and establish a geometric cutting model based on the operating parameters of the shaving cutter and the operating parameters of the part;

[0009] A processing module, which is used to obtain the chip volume generated at each moment during the entire machining process based on the geometric cutting model, and obtain the theoretical chip mass generated at each time point in combination with the material of the part to be machined;

[0010] A 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 running parameters of the gear shaving cutter when the deviation between the theoretical chip quality and the actual chip quality is greater than or equal to a threshold value.

[0011] Furthermore, a processing module is used to obtain the theoretical chip quality generated at each time point under different running parameters of the gear shaving cutter, and establish a mapping relationship between the running parameters of the gear shaving cutter and the theoretical chip quality generated at each time point.

[0012] The control module is used to, when the deviation between the theoretical chip quality and the actual chip quality is greater than or equal to the threshold value, 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, use it as a verification time point, and based on the actual chip quality and the verification time point, compare in the mapping relationship between the running parameters of the gear shaving cutter and the theoretical chip quality generated at each time point, obtain the deviation term and deviation amount of the running parameters of the gear shaving cutter, and adjust the running parameters of the gear shaving cutter.

[0013] Furthermore, the processing module is used to receive the allowable value of the running parameters of the gear shaving cutter set by the user, based on the allowable value of the running parameters of the gear shaving cutter and the geometric cutting model, within the allowable range of the running parameters of the gear shaving cutter, obtain the chip volume generated at each moment under different running parameters of the gear shaving cutter, and combine the material of the part to be machined to obtain the theoretical chip quality generated at each time point under different running parameters of the gear shaving cutter, and establish a mapping relationship between the running parameters of the gear shaving cutter and the theoretical chip quality generated at each time point.

[0014] Furthermore, the processing module is used to obtain the running parameters of the gear shaving cutter, and receive the allowable offset set by the user, and superimpose the allowable offset on the running parameters of the gear shaving cutter to obtain the allowable value of the running parameters of the gear shaving cutter.

[0015] Furthermore, the control module includes a chip metering unit, and the chip metering unit includes a metering box.

[0016] The metering box is communicated with a telescopic pipeline, one end of the telescopic pipeline far away from the metering box is communicated with an air amplifier, the air outlet of the air amplifier is close to the telescopic pipeline, and the compressed air inlet of the air amplifier is communicated with a controllable high-pressure air source.

[0017] A plurality of exhaust holes are opened on the side wall of one end of the metering box far away from the telescopic pipeline.

[0018] A weighing mechanism for weighing the chip quality is arranged at the bottom of the metering box.

[0019] Further, the weighing mechanism includes a measuring tank disposed in the metering box. A bearing plate is rotatably connected to the bottom of each measuring tank. A driving member for driving the bearing plate to rotate is disposed inside the side wall of the measuring tank. A weighing sensor is fixedly connected to the surface of the bearing plate. One end surface of the weighing sensor away from the bearing plate is fixedly connected with a measuring plate;

[0020] 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.

[0021] Further, the number of the measuring tanks is several, and several measuring tanks are arranged in sequence along the air flow direction in the metering box. Different measuring tanks are used to collect chips of different volumes;

[0022] The processing module is used to obtain the chip volume generated at each moment during the whole machining process based on the geometric cutting model, classify the types of chip volume based on the measuring tank, the number of types of chip volume classification corresponds to the number of measuring tanks, and calculate the theoretical chip mass of various volumes generated at each time point during the whole machining process;

[0023] The control module is used to obtain the chip mass collected by the weighing sensor corresponding to each measuring tank, so as to obtain the actual chip mass of various volumes generated at each time point during the whole machining process, compare the actual chip mass and the 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 running parameters of the gear shaving cutter are adjusted.

[0024] Further, the side walls of the measuring tanks are all inclined structures.

[0025] Further, obtain the change curves of the theoretical chip mass generated in each time period under different running parameters of the gear shaving cutter;

[0026] The processing module is used to obtain the change curve of the actual chip mass generated in each time period, and compare the change curve of the theoretical chip mass with the change curve of the actual chip mass in each time period in sequence during the whole machining process. When the deviation between the change curve of the theoretical chip mass and the change curve of the actual chip mass in the same time period is greater than or equal to the threshold, obtain the deviation term and deviation amount of the running parameters of the gear shaving cutter based on the change curve of the theoretical chip mass and the change curve of the actual chip mass, and adjust the running parameters of the gear shaving cutter.

[0027] On the other hand, a method for controlling the parameters of a gear shaving cutter is provided, including the following steps:

[0028] Obtain the gear shaving cutter model and the part model to be machined, obtain the running parameters of the gear shaving cutter and the running parameters of the part, and establish a geometric cutting model based on the running parameters of the gear shaving cutter and the running parameters of the part;

[0029] Based on the geometric cutting model, the chip volume generated at each moment during the entire machining process is obtained, and the theoretical chip mass generated at each time point is obtained by combining the material of the part to be machined.

[0030] The chip mass is monitored to obtain the actual chip mass generated at each time point. By comparing the theoretical chip mass and the actual chip mass, when the deviation between the theoretical chip mass and the actual chip mass is greater than or equal to the threshold value, the operating parameters of the gear shaving cutter are adjusted.

[0031] The technical principle of the above solution is as follows:

[0032] During the gear shaving process, both the cutter and the workpiece are in operation, and it is difficult to obtain the actual machining situation between the cutter and the workpiece in real time during this process. However, based on the geometric cutting model, it is possible to confirm the chip mass accumulated at each time point, the chip mass generated in each time period, or the change in chip mass in each time period during the gear shaving process when machining precisely according to the preset parameters, and theoretical calculations and actual monitoring can be carried out. By obtaining the theoretical quantity / value and the actual quantity / value of the above items, it is possible to compare whether there is a deviation in the current gear shaving process. By calculating the chip changes caused by the gear shaving cutter operating parameters not being set values, based on the actual chip situation obtained, the deviations existing during the operation of the gear shaving cutter can be estimated, that is, the deviation items and deviation amounts, so as to carry out real-time control of the operation of the gear shaving cutter to ensure the accurate progress of gear shaving machining.

[0033] The above solution has the following beneficial effects:

[0034] 1. In the present invention, a geometric cutting model is constructed through the parameters of the gear shaving cutter and the parameters of the part to be machined. Based on the geometric cutting model, the chip mass predicted theoretically at each time point during the entire machining process of the part can be obtained; and the chip mass actually generated at each time point is monitored. By comparing the chip mass predicted theoretically and the chip mass actually generated, it is possible to determine whether there is a deviation in the machined part, and thus determine whether it is necessary to adjust the operating parameters of the cutter. Compared with the prior art, it is possible to monitor the machining accuracy of the part in real time, and based on the monitoring results, the gear shaving cutter is adjusted in real time to ensure the efficient and accurate gear shaving machining of the part.

[0035] 2. In the present invention, the chip mass generated under different gear shaving cutter parameters is predicted. Thus, when it is necessary to adjust the gear shaving cutter parameters during the gear shaving process, based on the deviation between the actually generated chip mass and the theoretically predicted chip mass, the deviation items and deviation amounts can be obtained, so as to achieve accurate adjustment of the gear shaving cutter.

[0036] 3. The present invention obtains and compares the quality change curve generated based on the chip theory during the skiving process and the actually generated quality change curve, can monitor the deviation trend of the skiving tool during the skiving process, and when there may be a deviation trend, control the skiving tool in a timely manner to ensure the accuracy of the skiving process of parts.

[0037] 4. The present invention obtains the theoretical chip quality and the actual chip quality of various volumes generated at each time point during the skiving process. When there is an error in the actual chip quality of any type of volume, the skiving tool is adjusted to improve the accuracy of monitoring the skiving tool, so as to perform high-precision control on the skiving tool.

[0038] 5. The present invention efficiently collects chips during the skiving process through a chip metering unit. The chip metering unit is applicable to dry machining technologies such as skiving, can effectively collect chips generated during the skiving process, reduce the interference caused by chips not being removed in time to the skiving process of parts, and has a certain cooling effect on the machined surface of parts.

[0039] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. Description of the Drawings

[0040] Figure 1 Schematic diagram of an embodiment of the skiving tool parameter control system and method of the present invention;

[0041] Figure 2 Schematic diagram of an embodiment of the skiving tool parameter control system and method of the present invention;

[0042] Figure 3 Schematic diagram of an embodiment of the skiving tool parameter control system and method of the present invention;

[0043] Figure 4 Schematic diagram of an embodiment of the skiving tool parameter control system and method of the present invention;

[0044] Figure 5 Schematic diagram of an embodiment of the skiving tool parameter control system and method of the present invention;

[0045] Figure 6 Schematic diagram of an embodiment of the skiving tool parameter control system and method of the present invention.

[0046] Reference numerals in the accompanying drawings of the specification include: 1, metering box; 2, telescopic pipe; 3, air amplifier; 4, mounting seat; 5, metering plate; 6, filter screen; 7, metering tank; 8, discharge tank; 9, weighing sensor; 10, bearing plate. Detailed Embodiments

[0047] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are some of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0048] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is 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 thus should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0049] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] The following is a further detailed description through specific embodiments:

[0051] Example 1, as Figure 1 shown: A parameter control system for a shaving cutter mainly consists of a modeling module, a processing module, and a control module. Among them, the modeling module is mainly used for collecting basic data for shaving machining and establishing a geometric cutting model. The processing module is used to budget the chip quality of the workpiece during the shaving machining process based on the geometric cutting model. The control module controls the shaving cutter based on the actually monitored chip quality of the workpiece during the shaving machining process to achieve the purpose of real-time monitoring of the workpiece quality and efficient and accurate control of the shaving cutter.

[0052] The functions of each module will be explained in detail below in sequence:

[0053] The modeling module is used to obtain the shaving cutter model and the part model to be machined, obtain the operating parameters of the shaving cutter and the operating parameters of the part, and establish a geometric cutting model based on the operating parameters of the shaving cutter and the operating parameters of the part.

[0054] Specifically, first, establish a shaving motion coordinate system:

[0055] The generation hobbing process involves three motions: the rotational motion of the workpiece , the rotational motion of the tool and the feed motion along the axis of the workpiece . During the motion of the tool and the workpiece, there is always an axis intersection angle between the tool axis and the workpiece axis . The difference between generating internal gear workpieces and external gear workpieces lies in the center distance value and the cutter axis direction

[0056] Establish the coordinate systems for the generation hobbing motion, as Figure 2 shown. 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 auxiliary coordinate system of coordinate system , where the unit vector is ; coordinate system is the auxiliary coordinate system of coordinate system , where the unit vector is .

[0057] Coordinate system is used to establish the workpiece tooth surface model, coordinate system is used to establish the tool model. The spatial positions of the auxiliary coordinate systems and are fixed and do not change with time. The center distance represents the perpendicular distance between the tool axis and the workpiece axis, and the axis intersection angle represents the angle between the tool axis and the workpiece axis represents the angle by which coordinate system rotates with respect to the position at time 0, represents the distance by which coordinate system moves along the axial direction of the workpiece ( positive direction of the axis) with respect to the auxiliary coordinate system represents the angle by which coordinate system rotates with respect to the position at time 0

[0058] The swept surface of the cutting edge is the swept surface formed by the cutting edge in the workpiece coordinate system . The cutting edge of the generation hobbing tool is usually represented in the tool coordinate system . In order to represent the swept surface of the cutting edge and thus establish the chip model in the workpiece coordinate system , a coordinate system transformation is required. The transformation matrix from coordinate system to coordinate system :

[0059]

[0060] In the formula, each matrix is a coordinate transformation matrix:

[0061]

[0062]

[0063]

[0064] In the formula, represents the coordinate system to the coordinate system transformation matrix, represents the coordinate system to the coordinate system transformation matrix, represents the coordinate system to the coordinate system transformation matrix. and respectively represent the angular velocities of the workpiece and the tool during the shaving process, represents the displacement of the workpiece or the tool along the axial direction of the workpiece.

[0065] and respectively represent the number of teeth of the workpiece and the tool, satisfying:

[0066]

[0067]

[0068] Then, establish the flank-swept surface model:

[0069] To obtain the flank-swept surface model, it is necessary to use the coordinate transformation matrix to transform the cutting edge in the tool coordinate system to the workpiece coordinate system :

[0070]

[0071] In the formula, represents the point on the cutting edge, represents the distance from the point on the cutting edge of the th flank-swept surface in the tool coordinate system to the tool axis, , , respectively represent in the tool coordinate system in axis, Axis, The component in the axis direction. Transform the cutting edge into the workpiece coordinate system In, the swept surface of the cutting edge can be calculated according to Equation (8):

[0072]

[0073] In the formula, Indicates The point on the swept surface of the cutting edge in, Indicates from the tool coordinate system To the workpiece coordinate system The transformation matrix of. Expanding Equation (8) gives the parametric equation of the swept surface of the cutting edge:

[0074]

[0075] In the formula,

[0076]

[0077] Then, establish the swept surface family model:

[0078] A certain tooth of the cutter first contacts and scrapes a certain tooth groove of the workpiece, and the first swept process of the cutting edge is carried out. Suppose this tooth of the cutter is tooth No. 1, and the swept surface The time for sweeping the tooth groove is . When the workpiece rotates one week, the No. tooth of the cutter sweeps this tooth groove, that is, the second swept process of the cutting edge. The swept surface of the tooth of the cutter relative to this tooth groove The sweeping time is , According to the periodicity of the scraping process, the following relationship is satisfied:

[0079]

[0080] In the formula, Represents taking the remainder. From this, it can be obtained that when the workpiece rotates the th week, that is, the th swept process of the cutting edge, the swept surface Contacts the tooth groove The time is, satisfying , Satisfying

[0081]

[0082] According to the above formula, it can be deduced that when the workpiece rotates weeks, the included angle between tooth No. 1 of the cutter that first scrapes the tooth groove And the th time of scraping the tooth groove Of the No. tooth of the cutter is:

[0083]

[0084] By simultaneously solving equations (7) and (13), the parametric equations of the cutting edge on the th cutter tooth of the shaving cutter can be obtained:

[0085]

[0086] By simultaneously solving equations (8) and (14), the parametric equations of the swept surface of the cutting edge formed by the th shaving of the tooth groove are as follows:

[0087]

[0088] In the formula,

[0089]

[0090] According to equations (15) and (16), several swept surfaces can be calculated, and the set of them constitutes the swept surface family.

[0091] Then, the chip modeling is carried out:

[0092] Combined with the analysis of the chip generation process, the developed chip in the fully cutting state is a spatial geometric body surrounded by three surfaces, namely the surface to be machined (formed by the th swept surface in the swept surface family of the previous machining edge), the machined surface (formed by the th swept surface in the swept surface family of the current machining), and the th swept surface in the swept surface family of the current machining . By discretizing the cutting edge , the intersection coordinates of any edge point with the surface during the swept surface process can be solved by simultaneously solving equations (15) and (17), that is, , , , and then the intersection lines A, B, and C of the three surfaces can be obtained through the curve fitting method, that is, the boundary lines of the developed geometric chip. Based on this, the boundary positions of the machined surface, the surface to be machined, and the swept surface that constitute the chip outline are determined respectively to establish a three-dimensional chip geometric model.

[0093]

[0094] The processing module is used to obtain the chip volume generated at each moment during the entire machining process based on the geometric cutting model, and obtain the theoretical chip mass generated at each time point in combination with the material of the part to be machined.

[0095] Specifically, the processing module is used to obtain the theoretical chip quality generated at each time point under different running parameters of the gear hobbing cutter, and establish a mapping relationship between the running parameters of the gear hobbing cutter and the theoretical chip quality generated at each time point. Among them, the running parameters of the gear hobbing cutter mainly include the cutter speed, cutting depth, and feed rate. In this embodiment, when obtaining the theoretical chip quality generated at each time point under different gear hobbing cutter parameters, the following method is used:

[0096] First, control one of the three as a variable, and the other two as constants. The variable varies within the allowable value range of the running parameters of the gear hobbing cutter set by the user. The allowable value range of the running parameters of the gear hobbing cutter is mainly obtained by the processing module receiving the setting information of the user. Specifically, obtain the running parameters of the gear hobbing cutter, and receive the allowable offset set by the user, and superimpose the allowable offset on the running parameters of the gear hobbing cutter to obtain the allowable value range of the running parameters of the gear hobbing cutter.

[0097] Then, based on the allowable value range of the running parameters of the gear hobbing cutter and the geometric cutting model, within the allowable value range of the running parameters of the gear hobbing cutter, obtain the chip volume generated at each moment under different running parameters of the gear hobbing cutter, and obtain the material of the part to be machined. After obtaining the chip volume and the part material (chip material), the quality of the chip can be calculated and obtained.

[0098] For example, when the cutter speed set during gear hobbing is 500 r / min, the cutting depth is 0.7 mm, and the feed rate is 0.2 mm / r; the allowable offset of the cutter speed of the gear hobbing cutter set by the user is 20 r / min, and adding it to the set cutter speed of 500 r / min gives the allowable value range of the cutter speed from 480 r / min (minimum) to 520 r / min (maximum). Then the processing module simulates the theoretical chip quality generated at each time point when the cutter speed of the gear hobbing cutter 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, obtain the theoretical chip quality generated at each time point under different cutter speeds within the range of 480 - 500 r / min of the gear hobbing cutter, so as to obtain the influence of a single cutter speed change on the chip quality.

[0099] Based on the above principle, the influence of a single cutter speed change, cutting depth change, and feed rate change on the chip quality is obtained through the following methods:

[0100] (1) The processing module receives the allowable value range of the cutter speed set by the user. Based on the allowable value range of the cutter speed and the geometric cutting model, within the allowable value range of the cutter speed, obtain the chip volume generated at each moment under different cutter speeds, and combine with the material of the part to be machined to obtain the theoretical chip quality generated at each time point under different cutter speeds, and establish a mapping relationship between the cutter speed and the theoretical chip quality generated at each time point.

[0101] (2) The processing module receives the allowable value of the cutting depth set by the user. Based on the allowable value of the cutting depth and the geometric cutting model, within the range of the allowable value of the cutting depth, it obtains the chip volume generated at each moment under different cutting depths, combines with the material of the part to be machined to obtain the theoretical chip mass generated at each time point under different cutting depths, and establishes a mapping relationship between the cutting depth and the theoretical chip mass generated at each time point.

[0102] (3) The processing module receives the allowable value of the feed rate set by the user. Based on the allowable value of the feed rate and the geometric cutting model, within the range of the allowable value of the feed rate, it obtains the chip volume generated at each moment under different feed rates, combines with the material of the part to be machined to obtain the theoretical chip mass generated at each time point under different feed rates, and establishes a mapping relationship between the feed rate and the theoretical chip mass generated at each time point.

[0103] After the mapping relationships between the chip mass and each time point are established when the single tool rotation speed, cutting depth, and feed rate change as described above. It is also necessary to establish the mapping relationships between the chip mass and each time point when any two or three of the running parameters of the gear hobbing tool change based on the above principle, which are jointly used as the basis for subsequent gear hobbing tool control judgment.

[0104] The control module is used to monitor the chip mass, obtain the actual chip mass generated at each time point, compare the theoretical chip mass and the actual chip mass. When the deviation between the theoretical chip mass and the actual chip mass is greater than or equal to the threshold (this threshold is set by the user, and the smaller the threshold, the more sensitive the regulation of the gear hobbing tool), the running parameters of the gear hobbing tool are adjusted.

[0105] Specifically, when the gear hobbing tool completely performs part gear hobbing processing according to the preset machining program (the machining program generated by the numerical control system), in the ideal state, the chip mass generated at each time point or each time period has been 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 obtained by collecting and measuring 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 probably caused by the deviation of the running parameters of the gear hobbing tool. Therefore, in this embodiment, the deviation between the actual chip mass and the theoretical chip mass is used as the basis for whether to adjust the running parameters of the gear hobbing tool.

[0106] After it is determined that the operating parameters of the gear hobbing cutter need to be adjusted based on the deviation between the actual chip quality and the theoretical chip quality, it is necessary to confirm the items and amounts of the adjustment. Specifically, when the deviation between the theoretical chip quality and the actual chip quality is greater than or equal to the threshold value, 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, compare in the mapping relationship between the operating parameters of the gear hobbing cutter and the theoretical chip quality generated at each time point, obtain the deviation item (the item to be adjusted) and the deviation amount (the amount to be adjusted) of the operating parameters of the gear hobbing cutter, and adjust the operating parameters of the gear hobbing cutter.

[0107] This embodiment takes the deviation of a single cutting depth as an example: When the set cutter speed during gear hobbing is 450 r / min, the cutting depth is 0.7 mm, and the feed rate is 0.2 mm / r; the allowable offset of the cutting depth of the gear hobbing cutter set by the user is 0.05 mm, then the allowable value of the cutter cutting depth is obtained as 0.65 mm (minimum) to 0.75 mm (maximum); the processing module simulates the theoretical chip quality generated at each time point when the cutting depth of the gear hobbing cutter 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 the change of a single cutting depth on the chip quality, and establishes the mapping relationship between the two: 10 s after the start of processing - cutting depth 0.65 mm - theoretical chip quality 20.5 g, 10 s after the start of processing - cutting depth 0.66 mm - theoretical chip quality 21.5 g, 10 s after the start of processing - cutting depth 0.67 mm - theoretical chip quality 22.5 g... 10 s after the start of processing - cutting depth 0.7 mm - theoretical chip quality 25.5 g, 10 s after the start of processing - cutting depth 0.71 mm - theoretical chip quality 26.5 g... 10 s after the start of processing - cutting depth 0.75 mm - theoretical chip quality 30.5 g. Suppose the set deviation threshold between the theoretical chip quality and the actual chip quality is 1 g, that is, when the cutting depth of the gear hobbing cutter deviates from 0.7 mm to less than or equal to 0.69 mm or greater than or equal to 0.71 mm, it is necessary to adjust the cutting depth of the gear hobbing cutter. If the actually collected chip quality is 26.5 g, therefore, based on the above mapping relationship, it is possible to obtain that the deviation value of the cutting depth of the gear hobbing cutter from 0.7 mm is 0.71 mm. The control module is signal-connected to the operating system of the gear hobbing cutter (the gear hobbing cutter control system of the gear hobbing machine tool), and the control module issues a corresponding control signal to adjust the cutting depth of the gear hobbing cutter from 0.71 mm to 0.7 mm, thereby completing the control of the gear hobbing cutter when there is a deviation in a single cutting depth. When there are deviations in multiple operating parameters of the gear hobbing cutter, the gear hobbing cutter is also controlled based on the above principle, so as to realize the real-time monitoring and control of the operating quality of the gear hobbing cutter.

[0108] Such asFigure 3 As shown, a skiving cutter parameter control method corresponding to the skiving cutter parameter control system of this embodiment includes the following steps:

[0109] Obtain the skiving cutter model and the part model to be machined, obtain the skiving cutter operation parameters and the part operation parameters, and establish a geometric cutting model based on the skiving cutter operation parameters and the part operation parameters;

[0110] Based on the geometric cutting model, obtain the chip volume generated at each moment during the entire machining process, and obtain the theoretical chip mass generated at each time point in combination with the material of the part to be machined;

[0111] Monitor the chip mass, obtain the actual chip mass generated at each time point, compare the theoretical chip mass and the actual chip mass, and when the deviation between the theoretical chip mass and the actual chip mass is greater than or equal to the threshold value, adjust the skiving cutter operation parameters.

[0112] Embodiment 2, as Figures 3 - 6 As shown, this embodiment provides a metering unit that is convenient for measuring the chip mass generated during the skiving process. It belongs to the control module and is used to measure the chips in real time during the skiving process. It mainly includes a metering box 1, and the metering box 1 is connected with a telescopic pipe 2. The telescopic pipe 2 of this embodiment is an aluminum foil corrugated pipe to avoid damage to the telescopic pipe 2 caused by the chips repeatedly colliding with the inner wall of the telescopic pipe 2 during the chip collection process.

[0113] One end of the telescopic pipe 2 far away from the metering box 1 is connected with 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 with a controllable high-pressure air source. By supplying high-pressure air to the compressed air inlet of the air amplifier 3, a negative pressure suction force can be generated at the air inlet of the air amplifier 3 to collect the chips generated by skiving into the metering box 1. This chip collection method is suitable for dry machining technologies such as skiving.

[0114] A number of exhaust holes are provided on the side wall of the metering box 1 far away from the telescopic pipe 2, and a filter screen 6 is arranged in the exhaust holes to prevent the chips collected in the metering box 1 from flowing out of the metering box 1 with the air flow. A weighing mechanism for weighing the chip mass is arranged at the bottom of the metering box 1.

[0115] The weighing mechanism includes a metering tank 7 disposed within the metering box 1. A bearing plate 10 is rotatably connected to the bottom of the metering tank 7. A driving member for driving the rotation of the bearing plate 10 is disposed within the side wall of the metering tank 7. A weighing sensor 9 is fixedly connected to the surface of the bearing plate 10. One end surface of the weighing sensor 9 away from the bearing plate 10 is fixedly connected to a metering plate 5. The driving member preferably adopts a servo motor. The mutually contacting ends of the bearing plate 10 and the metering plate 5 need to adopt an arc surface structure to avoid interference during their rotation. In addition, the side walls of the metering tank 7 are all inclined structures to ensure that the chips fall onto 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 generated at each time point, or the actual chip mass produced within a certain period of time.

[0116] A mounting seat 4 is fixedly connected to the bottom of the metering box 1. A discharge chute 8 is formed within the mounting seat 4. After the machining of one part is completed or the chip mass metering for one end of a part is completed, the driving member is used to drive the metering plate 5 to rotate, so that the metering tank 7 communicates with the discharge chute 8, thereby discharging the chips on the surface of the metering plate 5 into the discharge chute 8, facilitating the subsequent continuous metering of the actual chip mass.

[0117] Example 3, as Figures 3 - 6 shown, the number of metering tanks 7 is 3, and the 3 metering tanks 7 are arranged in sequence along the air flow direction within the metering box 1. Different metering tanks 7 are used to collect chips of different volumes. From the one close to the telescopic pipe 2 to the one far from the telescopic pipe 2, the volume of the collected chips gradually decreases.

[0118] The processing module is used to obtain the chip volume generated at each moment during the entire machining process based on the geometric cutting model, and classify the types of chip volume based on the metering tank 7. The number of types of chip volume classification corresponds to the number of metering tanks 7. For example: the chip volume collected by the metering tank 7 close to the telescopic pipe 2 is classified as one type of chip, the chip volume collected by the metering tank 7 far from the telescopic pipe 2 is classified as three types of chips, and the chip volume collected by the metering tank 7 between the two is classified as two types of chips.

[0119] The processing module is used to calculate the theoretical chip mass of various volumes generated at each time point during the entire machining 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 for one type of chip, two types of chips, and three types of chips.

[0120] The control module is used to obtain the chip mass collected by the weighing sensors 9 corresponding to the respective metering tanks 7, so as to obtain the actual chip mass of various volumes generated at each time point during the entire machining process. By comparing the actual chip mass and the theoretical chip mass of various volume types, when the deviation between the actual chip mass and the theoretical chip mass of any volume type is greater than or equal to the threshold value, the running parameters of the gear hobbing cutter are adjusted. The comparison of the deviation between the actual chip mass and the theoretical chip mass here and the adjustment of the running parameters of the gear hobbing cutter after the comparison are the same as the principle of Embodiment 1, which will not be elaborated in this embodiment. The difference from Embodiment 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 running parameters of the gear hobbing cutter, which is convenient for efficiently and accurately adjusting the running parameters of the gear hobbing cutter.

[0121] Embodiment 4, the processing module is used to obtain the theoretical chip mass change curve generated in each time period under different running parameters of the gear hobbing cutter, which reflects the change of the theoretical chip mass of the gear hobbing cutter during the entire gear hobbing process according to the set running parameters.

[0122] 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 with the actual chip mass change curve in each time period in sequence during the entire machining process, which reflects the change of the actual chip mass of the gear hobbing cutter in a certain time period.

[0123] The theoretical chip mass and the actual chip mass should have a small difference, and the change curves of the two should also have a high degree of coincidence. 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 value, it indicates that there may be a deviation in the running parameters of the gear hobbing cutter, and the change curves of the two can reflect the trend of the deviation of the running parameters of the gear hobbing cutter to a certain extent. Therefore, based on the theoretical chip mass change curve and the actual chip mass change curve, the deviation term and deviation amount of the running parameters of the gear hobbing cutter are obtained, and the running parameters of the gear hobbing cutter are adjusted. The monitoring method of the gear hobbing cutter in this embodiment is different, but the adjustment method after monitoring that the running parameters of the gear hobbing cutter need to be adjusted is similar.

[0124] Obviously, the above embodiments are only examples clearly described and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present 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; A 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; 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; The control module is used for obtaining 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, taking it as the verification time point, and comparing the mapping relationship between the gear cutting tool operation parameters and the theoretical chip quality generated at each time point based on the actual chip quality and the verification time point, obtaining the deviation item and deviation amount of the gear cutting tool operation parameters, and adjusting the gear cutting tool operation parameters; 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); 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; 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.

2. The gear cutting tool parameter control system according to claim 1, 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.

3. The gear cutting tool parameter control system according to claim 1, characterized in that: The side walls of the metering groove (7) are all inclined structures.

4. The gear cutting tool parameter control system according to claim 1, 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.

5. A method for controlling parameters of a tooth-cutting 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; The chip volume generated at each moment in the entire machining process is obtained based on the geometric cutting model, and the theoretical chip quality generated at each time point is obtained in combination with the material of the part to be machined; specifically, the method includes: receiving the allowable value of the gear cutting tool operating parameter set by the user, and obtaining 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 based on the allowable value of the gear cutting tool operating parameter and the geometric cutting model, and obtaining the theoretical chip quality generated at each time point under different gear cutting tool operating parameters in combination with the material of the part to be machined, and establishing a mapping relationship between the gear cutting tool operating parameters and the theoretical chip quality generated at each time point; 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 when the deviation between the theoretical chip quality and the actual chip quality is greater than or equal to a threshold, adjust the gear cutting tool operation parameters; specifically including: when the deviation between the theoretical chip quality and the actual chip quality is greater than or equal to the threshold, 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, use it as a verification time point, and compare the mapping relationship between the gear cutting tool operation parameters and the theoretical chip quality generated at each time point based on the actual chip quality and the verification time point, obtain the deviation item and deviation amount of the gear cutting tool operation parameters, and adjust the gear cutting tool operation parameters; The actual chip mass is measured by a chip metering unit, and the chip metering unit includes 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); 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); By acquiring weight information collected by a weighing sensor (9), the actual chip mass generated at each time point is acquired; 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; Based on the geometric cutting model, the chip volume generated at each moment in the entire machining process is obtained, and the chip volume is classified into types based on the metering groove (7), the number of chip volume classification types corresponds to the number of metering grooves (7), and the theoretical chip mass of various volumes generated at each time point in the entire machining process is calculated; The chip mass collected by the weighing sensor (9) corresponding to each metering slot (7) is obtained, thereby obtaining the actual chip mass of various volumes generated at various time points during the entire processing process, and comparing 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 a threshold, the operating parameters of the tooth cutting tool are adjusted.

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