A grinding compensation method for root canal file

Abstract

The present invention relates to a grinding compensation method for a root canal file, comprising: fixing a blank material by a supporting device; rough machining the blank material by a rough machining grinding wheel, and machining the blank material from a cylinder into a smooth surface variable cone; constructing a coordinate system on the cross section of the root canal file, establishing the generatrix equation of the root canal file, and obtaining the coordinates of the processed points; determining the equation of the straight line on the cross section of the first supporting unit close to the root canal file, and determining the grinding compensation amount when feeding the fine grinding wheel according to the horizontal coordinate of the processed point; the fine grinding wheel performs fine machining according to the grinding compensation amount. The beneficial effect of the present invention is that the present invention calculates the compensation amount in the automatic grinding process of the root canal file by adopting a grinding compensation method, thereby solving the problem that in the existing root canal file manufacturing process, the root canal file is not realized to be unable to fit with the side of the supporting device away from the fine grinding wheel, and the existence of the compensation amount is ignored, thereby resulting in the problem that the product accuracy cannot be guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of root canal files, and more specifically, to a grinding compensation method for a root canal file. Background Art

[0002] In dental treatment, root canal files are a key tool used to clean and prepare root canals to receive filling materials, thereby ensuring the restoration effect and long-term health of the teeth. The design of root canal files needs to have precise size and shape to adapt to root canals of different shapes and sizes, which places extremely high demands on precision and efficiency in the manufacturing process. The traditional root canal file manufacturing process mainly relies on manual or mechanical processing methods, such as using grinding wheels for roughing and finishing.

[0003] The traditional manual grinding method is not only inefficient, but also easily affected by the worker's skill level and cannot guarantee product accuracy and consistency, especially when dealing with root canal files with complex shapes. In the process of machine automated grinding and manufacturing root canal files, there is a problem that the root canal file cannot be fully fitted with the support device on the side away from the fine grinding wheel. Therefore, when the fine grinding wheel is fed, there is a non-negligible compensation amount. If this compensation amount is ignored, the accuracy of the product cannot be guaranteed during processing. Summary of the invention

[0004] The purpose of the invention is to address the deficiencies of the prior art and to provide a grinding compensation method for a root canal file.

[0005] In a first aspect, a grinding compensation method for a root canal file is provided, comprising:

[0006] S1. Fixing the blank material by a supporting device; the supporting device comprises a first supporting unit located on the left side of the blank material and a second supporting unit located on the right side of the blank material; the rough grinding wheel is arranged on the left side of the first supporting unit, and the fine grinding wheel is arranged on the right side of the second supporting unit;

[0007] S2, using a rough grinding wheel to perform rough machining on the blank material in the support device, and processing the blank material from a cylindrical body into a smooth tapered body;

[0008] S3, constructing a coordinate system on the cross section of the root canal file, establishing a generatrix equation of the root canal file, and obtaining the coordinates of the processed points;

[0009] S4. Determine the equation of the straight line on the side of the first support unit cross section close to the root canal file , according to the horizontal coordinate of the processed point , determine the grinding compensation amount when feeding the fine grinding wheel as ; The fine grinding wheel performs fine machining according to the grinding compensation amount;

[0010] S5. Repeat S3-S4 until finishing of all processed points is completed.

[0011] Preferably, S1 further includes: a wire feeding device feeds the blank material into the supporting device through a rotating main shaft.

[0012] Preferably, in S3, a non-uniform rational spline curve is used to characterize the generatrix of the root canal file.

[0013] Preferably, in S3, the generatrix is ​​a generatrix on the root canal file that is away from the fine grinding wheel.

[0014] Preferably, S3 includes:

[0015] S301, establishing a coordinate system with the file tip of the root canal file as the origin of the coordinate system, the axial direction from the file end to the file tip of the root canal file as the y-axis, and the horizontal direction from the first support unit to the second support unit as the x-axis;

[0016] S302, determining the generatrix equation according to the coordinates of some known type value points of the generatrix;

[0017] S303, substituting the ordinate of the processed point into the generatrix equation of the root canal file to determine the abscissa of the processed point .

[0018] Preferably, S302 includes:

[0019] S3021, obtaining the coordinates of some type value points of the busbar;

[0020] S3022, parameterizing the partial type value points using a canonical accumulated chord length method to determine a node vector;

[0021] S3023, determining the tangent vector conditions of the first and last points;

[0022] S3024. Inversely determine the control points of the cubic NURBS curve and determine the generatrix equation of the root canal file.

[0023] In a second aspect, a grinding compensation device for a root canal file is provided, which is used to perform any of the methods described in the first aspect, and comprises: a wire feeding device, a rotating spindle, a supporting device, a roughing grinding wheel, and a finishing grinding wheel;

[0024] Wherein, the blank material is wound on the wire feeding device, and the blank material is fed into the supporting device through the rotating main shaft; the rough machining grinding wheel and the fine machining grinding wheel are located on both sides of the supporting device.

[0025] Preferably, a hole is opened inside the supporting device, and the hole diameter is larger than the hole diameter of the blank material.

[0026] The beneficial effects of the present invention are:

[0027] 1. The present invention adopts a grinding compensation method to calculate the compensation amount in the automatic grinding process of the root canal file, thereby solving the problem that in the existing root canal file manufacturing process, the root canal file is not realized to be unable to fit with the side of the supporting device away from the fine grinding wheel, and the existence of the compensation amount is ignored, resulting in the inability to ensure product accuracy.

[0028] 2. The present invention uses accurate non-uniform rational spline curves to characterize the complex generatrix shape of the root canal file, which can achieve more accurate grinding path control during CNC grinding. This precise control reduces errors in the processing process, so that the produced root canal files have higher dimensional accuracy and shape accuracy, and better adapt to root canals of different shapes and sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A flow chart of a grinding compensation method for root canal files;

[0030] Figure 2 A top view of a grinding compensation device for a root canal file;

[0031] Figure 3 It is a cross-sectional view of a root canal file and a supporting device;

[0032] Explanation of the reference numerals: wire feeding device 1 , rotating spindle 2 , supporting device 3 , first supporting unit 301 , second supporting unit 302 , roughing grinding wheel 4 , finishing grinding wheel 5 . DETAILED DESCRIPTION

[0033] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for ordinary persons in the art, without departing from the principle of the present invention, the present invention can also be modified in some ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0034] Embodiment 1:

[0035] like Figure 2 As shown, Example 1 of the present application provides a grinding compensation device for a root canal file, comprising: a wire feeding device 1, a rotating spindle 2, a supporting device 3, a roughing grinding wheel 4 and a finishing grinding wheel 5.

[0036] The rotating spindle 2 is located in the middle and rear of the entire device; looking from the front to the back, the wire feeding device 1 is located on the left side of the rotating spindle 2, and is located as a whole at the rear of the entire device; the supporting device 3 is located directly in front of the rotating spindle 2; the blank material is wound on the wire feeding device 1, and when the device is started, the wire feeding device 1 is used to feed the blank material into the supporting device through the rotating spindle 2; looking from the front to the back, the roughing grinding wheel 4 and the fine grinding wheel 5 are respectively located on the left and right sides of the supporting device 3.

[0037] It should be noted that the support device 3 has a hole inside, and the hole diameter is larger than the hole diameter of the blank material. Figure 3 As shown, the two sides of the hole of the support device 3 can be divided into a first support unit 301 and a second support unit 302 ; the second support unit 302 is provided with a feed groove for the finishing grinding wheel 5 .

[0038] like Figure 3 As shown, since the root canal file cannot fit with one side of the first supporting unit 301, there is a non-negligible compensation amount when the finishing grinding wheel 5 is fed. If the compensation amount is ignored, the accuracy of the product during processing cannot be guaranteed.

[0039] Furthermore, Example 1 of the present application uses known type value points , ... , and the upper endpoint and the lower endpoint The cut vector and , the generatrix equation of the root canal file on the side away from the finishing grinding wheel 5 is After being determined by the nurbs curve, assuming that the ordinate of the processed point is , substituting into the curve equation, the horizontal coordinate of the processed point can be obtained as It is known that the equation of the straight line on the side of the first support unit 301 cross section close to the root canal file is ; Then the compensation amount of the finishing grinding wheel 5 during feeding can be obtained from the distance formula between the two points: .

[0040] Embodiment 2:

[0041] On the basis of Example 1, Figure 1 As shown, Embodiment 1 of the present application provides a grinding compensation method for a root canal file, comprising:

[0042] S1, such as Figure 2 , 3As shown, the blank material is fixed by a supporting device 3; the supporting device 3 includes a first supporting unit 301 located on the left side of the blank material and a second supporting unit 302 located on the right side of the blank material; the roughing grinding wheel 4 is arranged on the left side of the first supporting unit 301, and the fine grinding wheel 5 is arranged on the right side of the second supporting unit 302.

[0043] S2, using a rough grinding wheel 4 to perform rough machining on the blank material in the supporting device 3, and processing the blank material from a cylindrical body into a smooth tapered body.

[0044] S3. Construct a coordinate system on the cross section of the root canal file, establish the generatrix equation of the root canal file, and obtain the coordinates of the processed points.

[0045] The generatrix of the root canal file is characterized by a non-uniform rational spline curve, and the generatrix is ​​the generatrix on the root canal file away from the fine grinding wheel 5 .

[0046] Specifically, S3 includes:

[0047] S301, establishing a coordinate system with the file tip of the root canal file as the origin of the coordinate system, the axial direction from the file end to the file tip of the root canal file as the y-axis, and the horizontal direction from the first support unit 301 to the second support unit 302 as the x-axis.

[0048] S302. Determine the generatrix equation according to the coordinates of some known type value points of the generatrix.

[0049] S302 includes:

[0050] S3021. Obtain the coordinates of some type value points of the busbar.

[0051] For example, taking the generatrix away from the finishing grinding wheel 5 as an example, some of the profile points , ... , , It is known that the difference between the ordinates of two adjacent points is the pitch. , , , , , , , , then these type value points The coordinates of , , , , , , , , In addition, the tangent vectors at the endpoints are also known. The tangent vectors at the upper and lower endpoints are and .

[0052] S3022. Use the canonical accumulated chord length method to parameterize some of the type value points and determine the node vector.

[0053] Specifically, ,

[0054]

[0055] Among them, n is the number of type value points minus one, and u is the node.

[0056] The node vector can be determined:

[0057]

[0058] S3023. Determine the tangent vector conditions of the first and last points.

[0059] Specifically, the tangent vector condition is:

[0060]

[0061]

[0062] in, ; , The tangent vector is the first and last point; It is the control point of the root canal file generatrix.

[0063] S3024. Inversely determine the control points of the cubic NURBS curve and determine the generatrix equation of the root canal file.

[0064] Specifically,

[0065] in, is the basis function, d is the control point, and q is the type value point; the expression formula of the basis function is:

[0066]

[0067] According to the node vector and tangent vector conditions, the control point is obtained They are:

[0068] , , , , , , , , , , ,

[0069] According to the above method, the generatrix equation away from the finishing grinding wheel 5 can be determined:

[0070]

[0071] S303, substituting the ordinate of the processed point into the generatrix equation of the root canal file to determine the abscissa of the processed point .

[0072] Specifically, according to the known Find the corresponding , we need to first determine which curve the point we are looking for is on. Assume , you can know ,but Substitute the desired u into the NURBS curve equation , we can get . You can get The value of .

[0073] S4. Determine the equation of the straight line on the side of the cross section of the first support unit 301 close to the root canal file , according to the horizontal coordinate of the processed point , determine the grinding compensation amount when feeding the fine grinding wheel 5 as ; The fine grinding wheel 5 performs fine machining according to the grinding compensation amount.

[0074] S5. Repeat S3-S4 until finishing of all processed points is completed.

[0075] Specifically, the method provided in this embodiment is a method corresponding to the device provided in Example 1. Therefore, the parts in this embodiment that are the same or similar to those in Example 1 can be referenced to each other and will not be repeated in this application.

Claims

1. A grinding compensation method for a root canal file, characterized in that: include: S1, fixing the blank material by a supporting device (3); The support device (3) comprises a first support unit (301) located on the left side of the blank material and a second support unit (302) located on the right side of the blank material; the roughing grinding wheel (4) is arranged on the left side of the first support unit (301), and the fine grinding wheel (5) is arranged on the right side of the second support unit (302); S2, using a rough grinding wheel (4) to perform rough machining on the blank material in the support device (3), and machining the blank material from a cylindrical body into a smooth tapered body; S3, constructing a coordinate system on the cross section of the root canal file, establishing a generatrix equation of the root canal file, and obtaining the coordinates of the processed points; S3 includes: S301, establishing a coordinate system with the file tip of the root canal file as the origin of the coordinate system, the axial direction from the file end of the root canal file to the file tip as the y-axis, and the horizontal direction from the first support unit (301) to the second support unit (302) as the x-axis; S302, determining the generatrix equation according to the coordinates of some known type value points of the generatrix; S302 includes: S3021, obtaining the coordinates of some type value points of the busbar; S3022, parameterizing the partial type value points using a canonical accumulated chord length method to determine a node vector; S3023, determining the tangent vector conditions of the first and last points; S3024, inversely solving the control points of the cubic NURBS curve and determining the generatrix equation of the root canal file; S303, substituting the ordinate of the processed point into the generatrix equation of the root canal file to determine the abscissa of the processed point ; S4. Since the root canal file cannot fit on one side of the first support unit (301), a grinding compensation amount exists when the finishing grinding wheel (5) is fed. The equation of the straight line on the cross section of the first support unit (301) close to the root canal file is determined. , according to the horizontal coordinate of the processed point , determine the grinding compensation amount when feeding the fine grinding wheel (5) as ; The fine grinding wheel (5) performs fine machining according to the grinding compensation amount; S5. Repeat S3-S4 until finishing of all processed points is completed.

2. The grinding compensation method of the root canal file according to claim 1, characterized in that: S1 also includes: the wire feeding device (1) feeds the blank material into the supporting device (3) through the rotating main shaft (2).

3. The grinding compensation method of the root canal file according to claim 2, characterized in that: In S3, a non-uniform rational spline curve is used to represent the generatrix of the root canal file.

4. The grinding compensation method of the root canal file according to claim 3, characterized in that: In S3, the generatrix is ​​a generatrix on the root canal file that is away from the fine grinding wheel (5).

5. A grinding compensation device for a root canal file, characterized in that: Used to perform the method according to any one of claims 1 to 4, comprising: a wire feeding device (1), a rotating spindle (2), a supporting device (3), a roughing grinding wheel (4) and a finishing grinding wheel (5); Wherein, a blank material is wound on the wire feeding device (1), and the blank material is fed into the supporting device (3) through a rotating main shaft (2); the rough machining grinding wheel (4) and the fine machining grinding wheel (5) are located on both sides of the supporting device (3).

6. The grinding compensation device for the root canal file according to claim 5, characterized in that: The support device (3) has a hole formed inside, and the hole diameter is larger than the hole diameter of the blank material.

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