CN112720060B - Double-profile curved surface narrow and long duct part machining reference determination method - Google Patents
Double-profile curved surface narrow and long duct part machining reference determination method Download PDFInfo
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- CN112720060B CN112720060B CN202011504378.7A CN202011504378A CN112720060B CN 112720060 B CN112720060 B CN 112720060B CN 202011504378 A CN202011504378 A CN 202011504378A CN 112720060 B CN112720060 B CN 112720060B
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- B—PERFORMING OPERATIONS; TRANSPORTING
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Abstract
The invention discloses a method for determining a machining reference of a double-profile curved surface narrow and long culvert part, which comprises the following steps of: establishing a three-dimensional coordinate system, and establishing a three-dimensional model of the outer surface of the duct part on the three-dimensional coordinate system; measuring the wall thickness of each side wall of the ducted part, establishing a three-dimensional model of the inner wall of the ducted part on a three-dimensional coordinate system according to the measured wall thickness of each side wall of the ducted part, and obtaining an actually measured three-dimensional model of the ducted part according to the three-dimensional model of the outer surface of the ducted part and the three-dimensional model of the inner wall of the ducted part; establishing a theoretical three-dimensional model of the duct part on a three-dimensional coordinate system, and adjusting the inner wall of the actually-measured three-dimensional model to a position coinciding with the inner wall of the theoretical three-dimensional model to form a vector difference between the actually-measured outer wall and the theoretical outer wall; and (4) processing the outer wall of each side wall of the ducted part by taking the vector difference as a processing amount. The method determines the processing standard of the duct parts and reduces the processing difficulty of the duct parts.
Description
Technical Field
The invention relates to the technical field of curved surface narrow and long culvert part machining, in particular to a double-profile line curved surface narrow and long culvert part machining benchmark determining method.
Background
The double-molded line curved surface narrow and long culvert part comprises four side walls, wherein three adjacent outer walls are planes, one outer wall is an arc surface, the inner wall of the arc surface and the inner wall of the side wall opposite to the inner wall are both arc-shaped, namely double-molded lines, the bending directions of the two arc-shaped inner walls are the same, namely a channel in the culvert part is bent, so that a large error exists between the wall thickness of the side wall of the machined culvert part and the wall thickness of the side wall of the required culvert part, the culvert needs to be reprocessed, the channel in the culvert part is difficult to machine due to the narrow and long structure of the culvert part, the reprocessing standard is determined according to the experience of an operator, the standards are different, and the reprocessed culvert part still has high reject ratio.
Disclosure of Invention
The invention aims to provide a method for determining a machining standard of a double-profile curved surface narrow and long culvert part, and the method is used for solving the problems of inconsistent machining standard and high machining difficulty of a culvert part in the background technology.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a method for determining machining reference of a double-profile curved surface narrow and long culvert part comprises the following steps:
providing a culvert part, wherein the culvert part is of a cuboid structure and is provided with four outer side walls, one outer side wall is a cambered surface, the surfaces of the other three outer side walls are processed to be planes, the end surface of the culvert part is a surface B, the four outer side walls of the culvert part are sequentially a surface C, a surface A, a surface D and a surface E, the outer wall of the surface C and the outer wall of the surface D are processed to be respectively vertical to the outer wall of the surface A, the surface E is a cambered surface, the projection of the surface E on the surface C falls into the surface C, the inner wall of the surface A is provided with a central line type line a along the length direction of the inner wall of the surface A, the distances from the type line a to the inner wall of the surface C and the inner wall of the surface D are equal, the inner wall of the surface E is provided with a central line type line E along the length direction of the inner wall of the surface E, and the distances from the type line E to the inner wall of the surface C and the inner wall of the surface D are equal;
establishing a three-dimensional coordinate system, and establishing a three-dimensional model of the outer surface of the duct part on the three-dimensional coordinate system;
measuring the wall thickness of each side wall of the ducted part, establishing a three-dimensional model of the inner wall of the ducted part on the three-dimensional coordinate system according to the measured wall thickness of each side wall of the ducted part, and obtaining an actually measured three-dimensional model of the ducted part according to the three-dimensional model of the outer surface of the ducted part and the three-dimensional model of the inner wall of the ducted part;
establishing a theoretical three-dimensional model of the ducted part on the three-dimensional coordinate system, correspondingly, the inner wall of the theoretical three-dimensional model also has a molded line a and a molded line e, and coinciding the molded line a and the molded line e of the actually measured three-dimensional model with the molded line a and the molded line e of the theoretical three-dimensional model so as to adjust the inner wall of the actually measured three-dimensional model to a position coinciding with the inner wall of the theoretical three-dimensional model, so that a vector difference is formed between the actually measured outer wall and the theoretical outer wall;
and processing the outer wall of each side wall of the duct part by taking the vector difference as a processing amount.
Preferably, the first and second electrodes are formed of a metal,
the three-dimensional coordinate system comprises an XOY surface, an XOZ surface and a YOZ surface, wherein the outer wall of the B surface is the YOZ surface, the outer wall of the A surface is the XOY surface, and the middle surface between the outer wall of the C surface and the outer wall of the D surface is the XOZ surface.
Preferably, before the step of establishing a three-dimensional coordinate system, the method further comprises the following steps: processing the outer wall of the surface B to be a plane;
and machining the outer wall of the B surface to be perpendicular to the outer wall of the A surface.
Preferably, the actually measured three-dimensional model is rotated around an X axis of the three-dimensional coordinate system and moved along a Z axis of the three-dimensional coordinate system, and a profile a and a profile e of the actually measured three-dimensional model are overlapped with a profile a and a profile e of the theoretical three-dimensional model.
Preferably, in the three-dimensional coordinate system, the vector difference between the C-plane side wall, the a-plane side wall and the D-plane side wall is the measured thickness minus the theoretical wall thickness;
the measured coordinate of the outer wall of the E surface is (X) Outer cover 、Y Outer cover ) The measured coordinate of the inner wall of the E plane is (X) Inner part 、Y Inner part ) And E plane outer wall theoretical value coordinate is (X) 2 、Y 2 ) The theoretical value coordinate of the inner wall of the E plane is (X) 1 、Y 1 ) Then, there are:
T＝[(Y outer cover -Y 2 ) 2 +(X Outer cover -X 2 ) 2 ] 0 . 5
X Inner part ＝X Outer cover -H×[(X Outer cover -X 2 )/T]
Y Inner part ＝Y Outer cover -H×[(Y Outer cover -Y 2 )/T]
X 1 ＝X 2 -H 0 ×[(X Outer cover -X 2 )/T]
Y 1 ＝Y 2 -H 0 ×[(Y Outer cover -Y 2 )/T]
T 1 ＝H-(H 0 +T)
Wherein T is the vector difference between the measured value and the theoretical value of the outer wall, T 1 Is the vector difference between the measured value and the theoretical value of the inner wall, H is the wall thickness value of the measuring point, H 0 To design a theoretical wall thickness.
Preferably, the size of the outer wall of the duct part is measured, and a three-dimensional model of the outer surface of the duct part is established on the three-dimensional coordinate system.
Preferably, in the step of measuring the wall thickness of each side wall of the ducted part, the thickness of each side wall is measured along the length direction of the ducted part by using a thickness gauge, and the distance between each measuring point is equal.
Preferably, the distance between each measuring point is 10mm to 30 mm.
Preferably, the method further comprises the following steps: and repeating the method for determining the processing reference of the double-molded line curved surface narrow and long culvert part until the culvert part meets the use requirement.
The invention has the beneficial effects that:
firstly establishing a three-dimensional model of the outer wall of the culvert part, then measuring the thickness of the side wall of the culvert part, indirectly obtaining a three-dimensional model of the inner wall of the duct part through calculation, wherein the combination of the three-dimensional model of the outer wall and the three-dimensional model of the inner wall is an actually measured three-dimensional model of the duct part, comparing the actually measured three-dimensional model with a theoretical three-dimensional model, the numerical values of the current ducted parts can be known, the vector difference between the actual measurement three-dimensional model and the theoretical three-dimensional model is obtained, each inner wall of the ducted part is taken as a reference, the vector difference is taken as the processing amount, the inner wall of the ducted part does not need to be processed, only the outer wall of the ducted part needs to be processed, can process out the product that satisfies the operation requirement, convert the inner wall of face from the duct part into the outer wall, establish unified processing benchmark, the processing degree of difficulty reduces by a wide margin, can promote the precision of machining efficiency and processing by a wide margin.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic top view of a culvert component according to an embodiment of the present invention;
figure 2 is a side view of the culvert components of an embodiment of the invention.
The labels in the figure are: 1-A surface, 2-B surface, 3-C surface, 4-D surface and 5-E surface.
Detailed Description
The technical solutions in the present embodiments will be clearly and completely described below with reference to the drawings in the present embodiments, which should not be construed as limiting the present invention to the specific embodiments, but are for explanation and understanding only:
as shown in fig. 1 and fig. 2, the present embodiment provides a method for determining a machining standard of a double-profile curved surface narrow and long ducted part, including the following steps:
a. and establishing a three-dimensional coordinate system, and establishing a three-dimensional model of the outer surface of the duct part on the three-dimensional coordinate system.
In this step, the duct terminal surface is B face 2, is C face 3, A face 1, D face 4 and E face 5 with four lateral walls of duct part in proper order, and three adjacent outer walls of duct part are the plane, and an outer wall is the cambered surface, and cambered surface inner wall and rather than relative lateral wall inner wall are the arc, and the cambered surface is E face 5, and the side relative to the cambered surface is A face 1, and C face 3 and D face 4 are another a pair of relative side.
Before the three-dimensional coordinate system is established, rust, oil stain, paint, oxide layers and the like on the surfaces of the side walls are polished and cleaned, the outer wall of the surface A1, the outer wall of the surface B2, the outer wall of the surface C3 and the outer wall of the surface D4 of the culvert part are processed to be flat surfaces, the outer wall of the surface B2 is processed to be perpendicular to the outer wall of the surface A1, and the outer wall of the surface C3 and the outer wall of the surface D4 are processed to be perpendicular to the outer wall of the surface A1 respectively, so that errors in the establishment of the three-dimensional coordinate system are reduced.
The three-dimensional coordinate system comprises an XOY surface, an XOZ surface and a YOZ surface, wherein the outer wall of the B surface 2 is the YOZ surface, the outer wall of the A surface 1 is the XOY surface, and the middle surface between the outer wall of the C surface 3 and the outer wall of the D surface 4 is the XOZ surface.
And a three-dimensional model of the outer surface of the duct part can be established on a three-dimensional coordinate system by measuring the size of the outer wall of the duct part.
b. Measuring the wall thickness of each side wall of the ducted part, establishing a three-dimensional model of the inner wall of the ducted part on a three-dimensional coordinate system according to the measured wall thickness of each side wall of the ducted part, and obtaining an actually measured three-dimensional model of the ducted part according to the three-dimensional model of the outer surface of the ducted part and the three-dimensional model of the inner wall of the ducted part.
In the step, the thickness measuring instrument is used for measuring the thickness of each side wall on the surfaces of the outer wall of the A face 1, the outer wall of the C face 3, the outer wall of the D face 4 and the outer wall of the E face 5 along the direction of an X axis in a three-dimensional coordinate system, namely along the length direction of the ducted part, the distance between every two measuring points is equal, in the embodiment, the number of times of measuring the outer wall of each side face is equal, the number of times is n, the distance between every two measuring points is 10-30 mm, the smaller the distance is, and the more accurate the established three-dimensional model of the inner wall of the ducted part is. Wherein the distance between the thickness measuring points on the outer wall surface of the E surface 5 is the distance projected on the X-axis direction and is not the linear distance with the outer wall of the E surface 5, so that the n-th distance on different side surfaces x Sub (n) x The value of 1-n) is the same as the projection point of the thickness measuring point on the X axis, so that the positioning times of the machining device for machining the outer wall of the duct part are reduced, the subsequent machining efficiency is improved, and the machining precision can be correspondingly improved.
In the three-dimensional model of the outer surface of the ducted part on the three-dimensional coordinate system, the outer wall is a planar side wall, the measured thickness is retracted inwards at each thickness measuring point, the calculated coordinates of the inner wall of the measuring point can be calculated, the calculated coordinates of the inner wall of each side wall are connected in sequence, and the three-dimensional model of the inner wall of the A surface 1, the C surface 3 and the D surface 4 of the ducted part can be established.
The actual measurement coordinate of the E surface 5 of the outer wall of the side wall with the outer wall being a cambered surface is (X) Outer cover 、Y Outer cover ) The measured coordinate of the inner wall is (X) Inner part 、Y Inner part ) The theoretical value coordinate of the outer wall is (X) 2 、Y 2 ) The theoretical value coordinate of the inner wall is (X) 1 、Y 1 ) Then, there are:
T＝[(Y outer cover -Y 2 ) 2 +(X Outer cover -X 2 ) 2 ] 0 . 5
X Inner part ＝X Outer cover -H×[(X Outer cover -X 2 )/T]
Y Inner part ＝Y Outer cover -H×[(Y Outer cover -Y 2 )/T]
X 1 ＝X 2 -H 0 ×[(X Outer cover -X 2 )/T]
Y 1 ＝Y 2 -H 0 ×[(Y Outer cover -Y 2 )/T]
T 1 ＝H-(H 0 +T)
Wherein T is the vector difference between the measured value and the theoretical value of the outer wall, T 1 Is the vector difference between the measured value and the theoretical value of the inner wall, H is the wall thickness value of the measuring point, H 0 To design the theoretical wall thickness, the outer surface theoretical value coordinate (X) 2 、Y 2 ) Obtained by taking points on the model.
According to the measured coordinate of the inner wall as (X) Inner part 、Y Inner part ) Namely, the three-dimensional model of the inner wall of the side wall of which the outer wall is the cambered surface, namely the three-dimensional model of the inner wall of the E surface 5, can be drawn.
and (c) combining the three-dimensional models obtained in the step a and the step b, and obtaining the actually measured three-dimensional model of the duct part on a three-dimensional coordinate system.
c. And establishing a theoretical three-dimensional model of the duct part on a three-dimensional coordinate system, and adjusting the inner wall of the actually-measured three-dimensional model to a position which is overlapped with the inner wall of the theoretical three-dimensional model, so that a vector difference is formed between the actually-measured outer wall and the theoretical outer wall.
The inner wall of the surface A1 is provided with a central line molded line a along the length direction, the distances from the molded line a to the inner wall of the surface C3 and the inner wall of the surface D4 are equal, the inner wall of the surface E5 is provided with a central line molded line E along the length direction, the distances from the molded line E to the inner wall of the surface C3 and the inner wall of the surface D4 are equal, and correspondingly, the theoretical three-dimensional model is also provided with the molded line a and the molded line E;
and (3) superposing the molded line a and the molded line e of the actually measured three-dimensional model with the molded line a and the molded line e of the theoretical three-dimensional model, namely adjusting the inner wall of the actually measured three-dimensional model to a position superposed with the inner wall of the theoretical three-dimensional model.
And rotating the actually measured three-dimensional model around the X axis of the three-dimensional coordinate system, moving along the Z axis of the three-dimensional coordinate system, and overlapping the molded line a and the molded line e of the actually measured three-dimensional model with the molded line a and the molded line e of the theoretical three-dimensional model.
The vector difference of the A surface 1, the C surface 3 and the D surface 4 is the difference between the measured thickness value of each surface and the theoretical wall thickness.
Vector difference of E plane 5Is T 1 。
d. And (4) processing the outer wall of each side wall of the ducted part by taking the vector difference as a processing amount.
Because the inner wall of duct part is not convenient for process after pouring the completion, consequently regard the inner wall of duct part as the benchmark, convert the inner wall of face of working from the duct part into the outer wall, add the vector difference that only need process each outer wall during processing can. A unified processing benchmark is established, the processing difficulty is greatly reduced, and the processing efficiency and the processing precision can be greatly improved.
e. And repeating the steps a to d of the method for determining the machining reference of the double-profile curved surface narrow and long culvert part until the culvert part meets the use requirement.
If the processed ducted parts meet the use requirements, the ducted parts can be put into use.
And if the processed culvert part does not meet the use requirement, processing the outer wall of each side wall of the culvert part again after calculating a new vector difference until the culvert part meets the use requirement.
The step is used for further improving the precision of the culvert part, so that the machined culvert part is closer to the specification of the theoretical culvert part.
It is to be understood that the above examples are merely illustrative for clarity of description and are not limiting on the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are intended to be within the scope of the invention.
Claims (9)
1. A double-profile curved surface narrow and long duct part machining reference determination method is characterized by comprising the following steps:
providing a culvert part, wherein the culvert part is of a cuboid structure and is provided with four outer side walls, one outer side wall is an arc surface, the surfaces of the other three outer side walls are processed to be planes, the end surface of the culvert part is a B surface, the four outer side walls of the culvert part are sequentially a C surface, an A surface, a D surface and an E surface, the outer walls of the C surface and the D surface are processed to be perpendicular to the outer wall of the A surface respectively, the E surface is an arc surface, the projection of the E surface on the C surface falls into the C surface, the inner wall of the A surface is provided with a central line molded line a along the length direction, the distances from the molded line a to the inner wall of the C surface and the inner wall of the D surface are equal, the inner wall of the E surface is provided with a central line molded line E along the length direction, and the distances from the molded line E to the inner wall of the C surface and the inner wall of the D surface are equal;
establishing a three-dimensional coordinate system, and establishing a three-dimensional model of the outer surface of the duct part on the three-dimensional coordinate system;
measuring the wall thickness of each side wall of the ducted part, establishing a three-dimensional model of the inner wall of the ducted part on the three-dimensional coordinate system according to the measured wall thickness of each side wall of the ducted part, and obtaining an actually measured three-dimensional model of the ducted part according to the three-dimensional model of the outer surface of the ducted part and the three-dimensional model of the inner wall of the ducted part;
establishing a theoretical three-dimensional model of the ducted part on the three-dimensional coordinate system, wherein correspondingly, the inner wall of the theoretical three-dimensional model also has a molded line a and a molded line e, and the molded line a and the molded line e of the actually measured three-dimensional model are overlapped with the molded line a and the molded line e of the theoretical three-dimensional model so as to adjust the inner wall of the actually measured three-dimensional model to a position overlapped with the inner wall of the theoretical three-dimensional model, so that a vector difference is formed between the actually measured outer wall and the theoretical outer wall;
and processing the outer wall of each side wall of the duct part by taking the vector difference as a processing amount.
2. The method for determining machining reference of double-line curved surface narrow and long ducted parts according to claim 1, wherein the three-dimensional coordinate system includes an XOY plane, an XOZ plane, and a YOZ plane, wherein the B-plane outer wall is the YOZ plane, the a-plane outer wall is the XOY plane, and a middle plane between the C-plane outer wall and the D-plane outer wall is the XOZ plane.
3. The machining reference determination method for the double-profile curved surface narrow and long duct part according to claim 2, characterized by further comprising the following steps before the step of establishing the three-dimensional coordinate system: processing the outer wall of the surface B to be a plane; and machining the outer wall of the B surface to be perpendicular to the outer wall of the A surface.
4. The method for determining the machining reference of the double-profile curved surface narrow-long duct part according to claim 1, wherein the actually measured three-dimensional model is rotated around an X axis of the three-dimensional coordinate system and moved along a Z axis of the three-dimensional coordinate system, and a profile a and a profile e of the actually measured three-dimensional model are overlapped with a profile a and a profile e of the theoretical three-dimensional model.
5. The machining reference determining method for the double-profile curved surface narrow and long culvert part according to claim 2, characterized in that in the three-dimensional coordinate system, the vector difference of the C-plane side wall, the A-plane side wall and the D-plane side wall is the measured thickness value minus the theoretical wall thickness;
the measured coordinate of the outer wall of the E surface is (X) Outer cover 、Y Outer cover ) The measured coordinate of the inner wall of the E plane is (X) Inner part 、Y Inner part ) And E plane outer wall theoretical value coordinate is (X) 2 、Y 2 ) The theoretical value coordinate of the inner wall of the E plane is (X) 1 、Y 1 ) Then, there are:
T＝[(Y outer cover -Y 2 ) 2 +(X Outer cover -X 2 ) 2 ] 0.5
X Inner part ＝X Outer cover -H×[(X Outer cover -X 2 )/T]
Y Inner part ＝Y Outer cover -H×[(Y Outer cover -Y 2 )/T]
X 1 ＝X 2 -H 0 ×[(X Outer cover -X 2 )/T]
Y 1 ＝Y 2 -H 0 ×[(Y Outer cover -Y 2 )/T]
T 1 ＝H-(H 0 +T)
Wherein T is the vector difference between the measured value and the theoretical value of the outer wall, T 1 Is the vector difference between the measured value and the theoretical value of the inner wall, H is the wall thickness value of the measuring point, H 0 To design a theoretical wall thickness.
6. The method for determining the machining reference of the double-profile curved surface long and narrow ducted part according to claim 1, wherein the size of the outer wall of the ducted part is measured, and a three-dimensional model of the outer surface of the ducted part is built on the three-dimensional coordinate system.
7. The method for determining the machining reference of the double-profile curved surface long and narrow ducted part according to claim 1, wherein in the step of measuring the wall thickness of each side wall of the ducted part, the thickness of each side wall is measured along the length direction of the ducted part by using a thickness gauge, and the distance between each measuring point is equal.
8. The method for determining the machining reference of the double-profile curved surface long and narrow ducted part according to claim 7, wherein the distance between each measuring point is 10mm to 30 mm.
9. The machining reference determination method for the double-profile line curved surface narrow and long culvert part according to any one of claims 1 to 8, characterized by further comprising the following steps:
repeating the double-profile line curved surface narrow and long culvert part machining reference determination method of claim 1 until the culvert part meets the use requirement.
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| JPS62203756A (en) * | 1986-03-03 | 1987-09-08 | Takaaki Nagao | Curved surface machining device |
| CN103760821A (en) * | 2013-11-18 | 2014-04-30 | 湖北三江航天红阳机电有限公司 | Complex casting machining process datum determination method |
| CN104289748A (en) * | 2014-08-22 | 2015-01-21 | 天津航天长征火箭制造有限公司 | Large-scale thin-wall skin self-adapting equal wall-thickness milling system and processing method thereof |
| CN108121291A (en) * | 2017-12-26 | 2018-06-05 | 湖北三江航天红阳机电有限公司 | A kind of casting machine-tooled method |
| CN111195830A (en) * | 2020-02-03 | 2020-05-26 | 大连理工大学 | Digital thinning processing method for large thin-wall barrel part |
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2020
- 2020-12-18 CN CN202011504378.7A patent/CN112720060B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62203756A (en) * | 1986-03-03 | 1987-09-08 | Takaaki Nagao | Curved surface machining device |
| CN103760821A (en) * | 2013-11-18 | 2014-04-30 | 湖北三江航天红阳机电有限公司 | Complex casting machining process datum determination method |
| CN104289748A (en) * | 2014-08-22 | 2015-01-21 | 天津航天长征火箭制造有限公司 | Large-scale thin-wall skin self-adapting equal wall-thickness milling system and processing method thereof |
| CN108121291A (en) * | 2017-12-26 | 2018-06-05 | 湖北三江航天红阳机电有限公司 | A kind of casting machine-tooled method |
| CN111195830A (en) * | 2020-02-03 | 2020-05-26 | 大连理工大学 | Digital thinning processing method for large thin-wall barrel part |
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