Method for modifying grinding wheel through numerical control interpolation grinding wheel forming device

Abstract

The invention discloses a method for conducting grinding wheel shaping through a numerical control interpolation grinding wheel forming device, the numerical control interpolation grinding wheel forming device comprises a lathe bed, a grinding wheel part and a shaping part, the lathe bed comprises an X-direction sliding plate and a Z-direction sliding plate which are vertically arranged, and a workpiece main shaft capable of conducting C-axis rotation is arranged on the Z-direction sliding plate; the grinding wheel part comprises a grinding wheel spindle and a grinding wheel arranged at the output end of the grinding wheel spindle, a variable first machining dip angle is arranged between the grinding wheel spindle and the Z axis, and the dressing part is arranged on the side face of the workpiece spindle and comprises a dresser spindle and a dressing wheel arranged at the output end of the dresser spindle. A variable second machining inclination angle is formed between the dresser main shaft and the Z axis, so that the dresser main shaft can be kept parallel to the grinding wheel main shaft, modification can be carried out through simultaneous rotary extrusion and synchronous interpolation action of the modification wheel and the grinding wheel, the grinding wheel subjected to formed grinding can be modified more simply, the grinding wheel forming precision is higher, and the grinding efficiency is improved. The invention belongs to the technical field of grinding machining and grinding machines.

Description

Technical Field

[0001] The invention belongs to the technical field of grinding processing and grinding machines, and more specifically, relates to a method for performing grinding wheel shaping through a numerically controlled interpolation grinding wheel shaping device. Background Art

[0002] Thread grinding equipment includes but is not limited to forming grinding equipment for processing triangular threads, trapezoidal threads, lead screws, worms and other parts. The essence of thread processing is to shape the grinding wheel according to the required thread shape, and then replicate the grinding wheel shape on the workpiece. The difficulty lies in the grinding wheel shaping.

[0003] At present, the mainstream grinding wheel shaping structures of grinding equipment at home and abroad are: 1. Add two coordinates independent of the machining coordinates on the upper wheel spindle to shape the grinding wheel. This method can complete most of the grinding wheel shape shaping. The advantage of this structure is that there is no need to swing the angle between the grinding process and the shaping process of the grinding wheel spindle, and there is no error caused by the reciprocating swing angle. However, due to its structural reasons, the grinding wheel shaping position and the actual grinding wheel processing position are not in the same position, so there is a large assembly error and resulting in shape errors, which will eventually lead to a loss of processing accuracy (reference Figure 6 );

[0004] Second, add a profiling tool to the workpiece spindle. When trimming the grinding wheel, swing the angle to be parallel to the Z axis, and then swing it to the required angle during processing. The advantage of this profiling method is that the profiling position of the grinding wheel and the grinding processing position are the same. However, since the grinding wheel spindle needs to be swung during the profiling and processing process, errors will be introduced into the processing system, which will lead to a loss of processing accuracy.

[0005] Therefore, there is an urgent need for a technical solution that can avoid bringing the errors existing in the grinding wheel dressing method into the grinding process. Summary of the invention

[0006] The main purpose of the present invention is to provide a method for grinding wheel shaping through a numerically controlled interpolation grinding wheel shaping device, which can make the shaping of the grinding wheel for profile grinding simpler and the grinding wheel shaping accuracy higher.

[0007] To achieve the above object, the technical solution of the present invention is:

[0008] A method for performing grinding wheel shaping by using a numerically controlled interpolation grinding wheel forming device, the numerically controlled interpolation grinding wheel forming device comprising: a bed, a grinding wheel portion, and a dressing portion, the bed comprising a vertically arranged X-axis slide and a Z-axis slide, the Z-axis slide being provided with a workpiece spindle capable of C-axis rotation; the grinding wheel portion being provided on the X-axis slide, the grinding wheel portion comprising a grinding wheel spindle and a grinding wheel arranged at an output end of the grinding wheel spindle, a variable first machining inclination angle being provided between the grinding wheel spindle and the Z-axis; the dressing portion being provided on a side of the workpiece spindle, the dressing portion being used for shaping the grinding wheel, the dressing portion comprising a dresser spindle and a correction wheel arranged at the output end of the dresser spindle, a variable second machining inclination angle being provided between the dresser spindle and the Z-axis, so that the dresser spindle can remain parallel to the grinding wheel spindle.

[0009] The processing method comprises:

[0010] Step 1: Adjust the first machining inclination angle to be the same as the second machining inclination angle, so that the grinding wheel spindle and the dresser spindle remain parallel;

[0011] Step 2: Set the angle between the grinding wheel spindle and the dresser spindle and the Z axis to α, and use the X-axis slide and the Z-axis slide to complete the interpolation action between the X-axis and the Z-axis to trim the desired shape.

[0012] In a specific embodiment of the present invention, the step 2 comprises: expressing any point on the desired trimming shape as (X theoretical coordinate, Z theoretical coordinate), and deriving the coordinates of the actual desired trimming shape as (X theoretical coordinate*f(α, Z, R, r), Z theoretical coordinate*f(α)), wherein the X theoretical coordinate is the X-axis coordinate of the two-dimensional coordinate of the desired grinding wheel shape, the Z theoretical coordinate is the Z-axis coordinate of the two-dimensional coordinate of the desired grinding wheel shape, the R is the grinding wheel radius corresponding to the contact tangent point when the grinding wheel (22) is trimmed, and the r is the trimming disc wheel radius corresponding to the contact tangent point when the grinding wheel (22) is trimmed.

[0013] In a specific embodiment of the present invention, the dressing part further comprises a chassis and an arc-shaped guide rail provided between the chassis and the dresser spindle, and the dresser spindle can rotate around a rotation axis of the arc-shaped guide rail.

[0014] In a specific embodiment of the present invention, the bed further includes a workpiece headstock and a tailstock respectively disposed at two ends of the Z-direction slide.

[0015] In a specific embodiment of the present invention, the inner sides of the workpiece headstock and the tailstock are respectively provided with tips for fixing the workpiece.

[0016] One of the above technical solutions of the present invention has at least one of the following advantages or beneficial effects:

[0017] The present invention arranges the dressing part on the side of the workpiece spindle, thereby reducing thermal deformation caused by changes in ambient temperature and further ensuring machining accuracy. A variable first machining inclination angle is set between the grinding wheel spindle and the X-axis, and a variable second machining inclination angle is set between the dresser spindle and the Z-axis, thereby ensuring that the dresser spindle can remain parallel to the grinding wheel spindle during the swing angle movement, so that the correction wheel and the grinding wheel can be simultaneously rotated, extruded and synchronously interpolated to perform shaping, thereby making the shaping of the grinding wheel for forming grinding simpler and the grinding wheel forming accuracy higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described below in conjunction with the accompanying drawings and embodiments;

[0019] Figure 1 It is an overall structural diagram of an embodiment of the present invention;

[0020] Figure 2 is a front view of an embodiment of the present invention;

[0021] Figure 3 is a top view of an embodiment of the present invention;

[0022] Figure 4 is a schematic diagram of a trimming portion of an embodiment of the present invention;

[0023] Figure 5 is a structural diagram of a trimming portion of an embodiment of the present invention;

[0024] Figure 6 It is one of the existing mainstream grinding equipment grinding wheel dressing structures;

[0025] Figure 7 It is a processing schematic diagram of an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0027] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are merely simplified descriptions for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0028] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection or a movable connection, a detachable connection or a non-detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be internal connection between two elements, indirect connection, or an interactive relationship between two elements.

[0031] The following disclosure provides many different embodiments or examples for implementing different solutions of the present invention.

[0032] Reference Figures 1 to 7 As shown, a method for grinding wheel shaping by a CNC interpolation grinding wheel forming device is shown, wherein the CNC interpolation grinding wheel forming device comprises a bed 1, a grinding wheel part 2 and a dressing part 3, wherein the bed 1 comprises a vertically arranged X-axis slide and a Z-axis slide, and the Z-axis slide is provided with a workpiece spindle 11 capable of C-axis rotation.

[0033] In one embodiment of the present invention, a workpiece headstock 12 and a tailstock 13 are correspondingly disposed at both ends of the Z-direction slide, and a top 4 for fixing the workpiece is correspondingly disposed on the inner sides of the workpiece headstock 12 and the tailstock 13 .

[0034] In one embodiment of the present invention, the grinding wheel unit 2 is arranged on the X-axis slide, and the grinding wheel unit 2 includes a grinding wheel spindle 21 and a grinding wheel 22 arranged at the output end of the grinding wheel spindle 21. A variable first processing inclination angle is provided between the grinding wheel spindle 21 and the Z axis. The grinding wheel spindle 21 can be manually swung or automatically swung, so that the grinding wheel spindle 21 can maintain the swing angle during grinding, thereby avoiding the loss of precision of the grinding wheel 22 due to the swing angle movement in both the grinding wheel dressing and grinding processing states.

[0035] In one embodiment of the present invention, the dressing part 3 includes a dresser spindle 31, a correction wheel 32 arranged at the output end of the dresser spindle 31, a chassis 33, and an arc guide rail 34 arranged between the chassis 33 and the dresser spindle 31. The dresser spindle 31 can adopt manual swing angle or automatic swing angle, and the arc center of the correction wheel 32 and the rotation axis of the arc guide rail 34 are arranged to coincide. The dresser spindle 31 can rotate around the rotation axis of the arc guide rail 34. During the entire rotation process, the arc center of the correction wheel 32 and the rotation axis of the arc guide rail 34 coincide.

[0036] In one embodiment of the present invention, the dressing part 3 is used to shape the grinding wheel 22. The dressing part 3 is arranged on the side of the workpiece spindle 11, so it is very close to the workpiece to be processed, thereby reducing the thermal deformation caused by changes in ambient temperature, and further reducing the precision loss caused by thermal deformation. The compensation of the grinding wheel shaping can make the processing accuracy more stable.

[0037] In one embodiment of the present invention, a variable second machining inclination angle is provided between the dresser spindle 31 and the Z axis, thereby ensuring that the dresser spindle 31 can remain parallel to the grinding wheel spindle 21, so that the correction wheel 32 and the grinding wheel 22 can be rotated and extruded simultaneously and interpolated to perform shaping, thereby making the shaping of the grinding wheel for forming grinding simpler and the grinding wheel shaping accuracy higher.

[0038] In one embodiment of the present invention, the correction wheel 32 is an arc butterfly correction wheel, and the dresser spindle 31 can drive the correction wheel 32 to rotate while moving along the Z axis, and ensure that the dresser spindle 31 and the grinding wheel spindle 21 always remain parallel when moving on the slide rail, and then the correction wheel 32 and the grinding wheel 22 are simultaneously rotated, extruded and synchronously interpolated to perform shaping, which can ensure the shaping accuracy and good correction shape for a long time, and can also perform local compensation correction, thereby ensuring that the grinding wheel shaping is more convenient and quick, and ensuring higher accuracy after the grinding wheel is formed.

[0039] In one embodiment of the present invention, the shaping method comprises:

[0040] Step 1: Adjust the first machining inclination angle to be the same as the second machining inclination angle so that the grinding wheel spindle 21 and the dresser spindle 31 remain parallel;

[0041] Step 2: Set the angle between the grinding wheel spindle 21 and the dresser spindle 31 and the Z axis to α, and use the X-axis slide and the Z-axis slide to complete the interpolation action between the X-axis and the Z-axis to trim the desired shape;

[0042] Step three, correct the coordinates of any point of the required trimming shape. The specific steps are as follows: assume that the maximum outer circle coordinate point of the required trimming shape of the grinding wheel 22 is (0, 0), and place the required trimming shape in the first and second quadrants to establish an XZ coordinate system. Then, any point on the required trimming shape can be expressed as (X theoretical coordinate, Z theoretical coordinate). Therefore, it can be deduced that the actual required trimming shape coordinates are (X theoretical coordinate*f(α, Z, R, r), Z theoretical coordinate*f(α)).

[0043] Among them, f(α, Z, R, r) is an equation about the angle α, the Z theoretical coordinate, the radius of the grinding wheel 22, and the radius of the correction wheel 32; f(α) is an equation about the angle α; α is the angle between the dresser spindle 31 and the Z axis; the X theoretical coordinate is the X-axis coordinate of the two-dimensional coordinate of the required grinding wheel shape; the Z theoretical coordinate is the Z-axis coordinate of the two-dimensional coordinate of the required grinding wheel shape; R is the grinding wheel radius corresponding to the contact tangent point when the grinding wheel 22 is trimmed; r is the trimming disc wheel radius corresponding to the contact tangent point when the grinding wheel 22 is trimmed.

[0044] The shaping method of the CNC interpolation grinding wheel forming device can convert (X theoretical coordinate, Z theoretical coordinate) into (X actual coordinate, Z actual coordinate) through a mathematical algorithm to realize shaping processing of a grinding wheel of any shape when an angle α exists between the grinding wheel spindle and the actual movement direction.

[0045] Compared with the existing grinding wheel shaping method, which uses the automatic swing angle of the A-axis and the different A-axis angles for each grinding wheel shaping and grinding process, the precision loss caused by the rotation of the A-axis is effectively controlled;

[0046] Compared with the grinding wheel profiling method in which the profiling device is above the grinding wheel spindle, the thermal deformation caused by ambient temperature changes is effectively controlled.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for grinding wheel shaping by using a CNC interpolation grinding wheel shaping device, characterized in that: The CNC interpolation grinding wheel forming device comprises: A bed (1), the bed (1) comprising an X-direction slide and a Z-direction slide arranged vertically, the Z-direction slide being provided with a workpiece spindle (11) capable of C-axis rotation; A grinding wheel unit (2), the grinding wheel unit (2) being arranged on the X-axis slide, the grinding wheel unit (2) comprising a grinding wheel spindle (21) and a grinding wheel (22) arranged at an output end of the grinding wheel spindle (21), and a variable first machining inclination angle being arranged between the grinding wheel spindle (21) and the Z axis; A dressing part (3), the dressing part (3) being arranged on a side of the workpiece spindle (11), the dressing part (3) being used for shaping the grinding wheel (22), the dressing part (3) comprising a dresser spindle (31) and a correction wheel (32) arranged at an output end of the dresser spindle (31), a variable second machining inclination angle being arranged between the dresser spindle (31) and the Z axis so that the dresser spindle (31) and the grinding wheel spindle (21) remain parallel; The processing method comprises: Step 1: adjusting the first machining inclination angle to be the same as the second machining inclination angle, so that the grinding wheel spindle (21) and the dresser spindle (31) remain parallel; Step 2: setting the angle between the grinding wheel spindle (21) and the dresser spindle (31) and the Z axis to α, completing the interpolation action between the X axis and the Z axis through the X-axis slide and the Z-axis slide to trim the desired shape.

2. The method for grinding wheel shaping by using a CNC interpolation grinding wheel shaping device according to claim 1, characterized in that: The second step comprises: any point on the desired trimming shape can be expressed as (X theoretical coordinate, Z theoretical coordinate), and the coordinates of the actual desired trimming shape are derived as (X theoretical coordinate*f(α, Z, R, r), Z theoretical coordinate*f(α)), wherein the X theoretical coordinate is the X-axis coordinate of the two-dimensional coordinate of the desired grinding wheel shape, the Z theoretical coordinate is the Z-axis coordinate of the two-dimensional coordinate of the desired grinding wheel shape, the R is the grinding wheel radius corresponding to the contact tangent point when the grinding wheel (22) is trimmed, and the r is the trimming disc wheel radius corresponding to the contact tangent point when the grinding wheel (22) is trimmed.

3. The method for grinding wheel shaping by using a CNC interpolation grinding wheel shaping device according to claim 1, characterized in that: The trimming section (3) further comprises a chassis (33) and an arc-shaped guide rail (34) arranged between the chassis (33) and the trimmer spindle (31); the trimmer spindle (31) can rotate around the rotation axis of the arc-shaped guide rail (34).

4. The method for grinding wheel shaping by using a CNC interpolation grinding wheel shaping device according to claim 1, characterized in that: The bed (1) also includes a workpiece headstock (12) and a tailstock (13) which are respectively arranged at the two ends of the Z-direction slide correspondingly.

5. The method for grinding wheel shaping by using a numerically controlled interpolation grinding wheel shaping device according to claim 4, characterized in that: The inner sides of the workpiece headstock (12) and the tailstock (13) are respectively provided with a top (4) for fixing the workpiece.

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