Numerical control interpolation grinding wheel forming device

Abstract

The utility model 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 utility model belongs to the technical field of grinding machining and grinding machines.

Description

Technical Field

[0001] The utility model belongs to the technical field of grinding and grinding machines, and more specifically relates to a numerically controlled interpolation grinding wheel forming device. Background Art

[0002] Thread grinding equipment includes but is not limited to forming grinding equipment for processing components such as triangular threads, trapezoidal threads, lead screws, and worms. The essence of thread processing is to modify the shape of 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 modification.

[0003] At present, the mainstream grinding wheel shaping structures of grinding equipment at home and abroad are: 1. Adding two coordinates independent of the coordinates used for processing 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 error, which will eventually lead to loss of processing accuracy (reference Figure 6 );

[0004] Second, add a shaping tool to the workpiece spindle. When shaping the grinding wheel, swing it to be parallel to the Z axis, and then swing it to the required angle during processing. The advantage of this shaping method is that the shaping 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 shaping and processing process, errors will be introduced into the processing system, which will lead to 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. Utility Model Content

[0006] The main purpose of the utility model is to provide a numerical control interpolation grinding wheel forming device which can make the grinding wheel shaping of forming grinding simpler and the grinding wheel forming precision higher.

[0007] In order to achieve the above-mentioned purpose, the technical solution of the utility model is:

[0008] A CNC interpolation grinding wheel forming device comprises: a bed, a grinding wheel portion, and a dressing portion, wherein the bed comprises a vertically arranged X-axis slide and a Z-axis slide, and the Z-axis slide is provided with a workpiece spindle capable of C-axis rotation; the grinding wheel portion is arranged on the X-axis slide, the grinding wheel portion comprises a grinding wheel spindle and a grinding wheel arranged at the output end of the grinding wheel spindle, and a variable first machining inclination angle is provided between the grinding wheel spindle and the Z-axis; the dressing portion is arranged on the side of the workpiece spindle, and the dressing portion is used to shape the grinding wheel, the dressing portion comprises a dresser spindle and a correction wheel arranged at the output end of the dresser spindle, and a variable second machining inclination angle is provided between the dresser spindle and the Z-axis so that the dresser spindle can remain parallel to the grinding wheel spindle.

[0009] In a specific embodiment of the present invention, the dressing part further includes a chassis and an arcuate guide rail provided between the chassis and the dresser spindle, and the dresser spindle can rotate around the rotation axis of the arcuate guide rail.

[0010] In a specific embodiment of the present invention, the bed further includes a workpiece headstock and a tailstock respectively provided at both ends of the Z-direction slide.

[0011] In a specific embodiment of the present invention, tips for fixing the workpiece are respectively provided on the inner sides of the workpiece headstock and the tailstock.

[0012] One of the above technical solutions of the utility model has at least one of the following advantages or beneficial effects:

[0013] The utility model arranges the dressing part on the side of the workpiece spindle, thereby reducing thermal deformation caused by changes in ambient temperature, further ensuring processing accuracy, and by setting a variable first processing inclination angle between the grinding wheel spindle and the X-axis, and a variable second processing inclination angle 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 rotated and extruded at the same time and synchronously interpolated to perform shaping, thereby making the grinding wheel shaping of the forming grinding simpler and the grinding wheel shaping accuracy higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0015] Figure 1 This is an overall structural diagram of an embodiment of the utility model;

[0016] Figure 2 It is a front view of an embodiment of the utility model;

[0017] Figure 3 It is a top view of an embodiment of the utility model;

[0018] Figure 4 This is a schematic diagram of a trimming portion of an embodiment of the present utility model;

[0019] Figure 5 This is a structural diagram of a trimming portion of an embodiment of the present utility model;

[0020] Figure 6 It is one of the existing mainstream grinding equipment grinding wheel dressing structures;

[0021] Figure 7 It is a processing schematic diagram of an embodiment of the utility model. DETAILED DESCRIPTION

[0022] The following describes embodiments of the present invention in detail, examples of which 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. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0023] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They 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. Therefore, they cannot be understood as limitations on the present invention.

[0024] In the description of this utility model, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified 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.

[0027] The following disclosure provides many different embodiments or examples for implementing different solutions of the present invention.

[0028] Reference Figures 1 to 7 As shown, a CNC interpolation grinding wheel forming device includes a bed 1, a grinding wheel part 2 and a dressing part 3, wherein the bed 1 includes a vertically arranged X-axis slide and a Z-axis slide, and the Z-axis slide is provided with a workpiece spindle 11 that can perform C-axis rotation.

[0029] In one embodiment of the present invention, a workpiece headstock 12 and a tailstock 13 are correspondingly provided at both ends of the Z-direction slide, and a center 4 for fixing the workpiece is correspondingly provided on the inner sides of the workpiece headstock 12 and the tailstock 13 .

[0030] In one embodiment of the present invention, the grinding wheel portion 2 is arranged on the X-axis slide, and the grinding wheel portion 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, 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.

[0031] 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 set 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.

[0032] 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.

[0033] 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 synchronously interpolated to perform shaping, thereby making the shaping of the grinding wheel for forming grinding simpler and the grinding wheel forming accuracy higher.

[0034] In one embodiment of the present invention, the correction wheel 32 is an arc butterfly-shaped 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.

[0035] In one embodiment of the present invention, the shaping method includes:

[0036] 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;

[0037] 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 and Z-axis slides to perform interpolation between the X-axis and the Z-axis to trim the desired shape;

[0038] Step 3. 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)).

[0039] 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 desired grinding wheel shape; the Z theoretical coordinate is the Z-axis coordinate of the two-dimensional coordinate of the desired grinding wheel shape; R is the grinding wheel radius corresponding to the contact tangent point when the grinding wheel 22 is being trimmed; r is the trimming disc wheel radius corresponding to the contact tangent point when the grinding wheel 22 is being trimmed.

[0040] 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 any shape grinding wheel when there is an angle α between the grinding wheel spindle and the actual movement direction.

[0041] Compared with the existing grinding wheel shaping method that uses automatic A-axis swing angle and different A-axis angles for each grinding wheel shaping and grinding process, this effectively controls the precision loss caused by A-axis rotation;

[0042] Compared with the grinding wheel shaping method in which the shaping device is above the grinding wheel spindle, it effectively controls the thermal deformation caused by ambient temperature changes.

[0043] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A CNC interpolation grinding wheel forming device, characterized in that: include: A bed (1), the bed (1) comprising an X-direction slide and a Z-direction slide arranged vertically, wherein the Z-direction slide is 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) is provided on the side of the workpiece spindle (11), and is used for shaping the grinding wheel (22). The dressing part (3) comprises a dresser spindle (31) and a correction wheel (32) provided at the output end of the dresser spindle (31). A variable second machining inclination angle is provided between the dresser spindle (31) and the Z axis so that the dresser spindle (31) and the grinding wheel spindle (21) remain parallel.

2. The CNC interpolation grinding wheel forming device according to claim 1, characterized in that: The trimming portion (3) further comprises a chassis (33) and an arc-shaped guide rail (34) arranged between the chassis (33) and the trimmer main shaft (31); the trimmer main shaft (31) can rotate around the rotation axis of the arc-shaped guide rail (34).

3. The CNC interpolation grinding wheel forming device according to claim 1, characterized in that: The bed (1) further comprises a workpiece headstock (12) and a tailstock (13) respectively arranged at the two ends of the Z-direction slide.

4. The CNC interpolation grinding wheel forming device according to claim 3, characterized in that: The inner sides of the workpiece headstock (12) and the tailstock (13) are respectively provided with tips (4) for fixing the workpiece.

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