CN109211158B - Method for determining positioning reference rotation error of two holes on one side of box hole series processing - Google Patents
Method for determining positioning reference rotation error of two holes on one side of box hole series processing Download PDFInfo
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- CN109211158B CN109211158B CN201811066224.7A CN201811066224A CN109211158B CN 109211158 B CN109211158 B CN 109211158B CN 201811066224 A CN201811066224 A CN 201811066224A CN 109211158 B CN109211158 B CN 109211158B
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- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
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Abstract
The invention discloses a method for determining a positioning reference rotation error of two holes on one surface of a box body hole system, which comprises the following steps: drawing a CAD model of the box body processing technology according to a ratio of 1:1, and embodying the geometric relationship between the box body hole system position and the positioning element; assuming that the manufacturing error of the positioning pin and the positioning hole is 0, simulating the positioning process of two holes on one surface to establish the relationship between the positioning element and the hole system position, establishing a two-dimensional model by utilizing CAD software, and defining the horizontal coordinate A of the first hole and the horizontal coordinate E of the second hole on the box body hole system; and (3) considering the tolerance of the positioning element, simulating the positioning process, respectively establishing a box body machining reference forward rotation model and a box body machining reference reverse rotation model by utilizing CAD software, keeping the central distance between the first hole and the second hole unchanged, and obtaining the maximum and small values of the vertical coordinate of the first hole and the maximum and small values of the vertical coordinate of the second hole on the box body hole system. The method can determine the positioning reference rotation error of two holes on one side of the hole system processing of the box body, and has the advantages of good intuition, low cost and high precision.
Description
Technical Field
The invention relates to a two-dimensional modeling method for determining positioning reference rotation errors of two holes on one surface of a box body hole system.
Background
At present, an extreme value method is usually adopted for determining the rotation error, and the rotation error is calculated according to a positioning process, an extreme dimension and a calculation formula, but the method is complex in calculation, easy to make mistakes, poor in intuition and to be improved. The extreme method is used for calculating a dimension chain such as an assembly dimension chain, a machining dimension chain and the like in mechanical design and manufacturing, and finally, the machining precision or the allowable error of the part is determined.
Disclosure of Invention
The invention aims to provide a method for determining the positioning reference rotation error of two holes on one side of a hole system of a box body, which can determine the positioning reference rotation error of two holes on one side of the hole system of the box body and has the advantages of good intuition, low cost and high precision.
In order to achieve the above purpose, the solution of the invention is:
a method for determining the positioning reference rotation error of two holes on one side of a box hole system machining surface comprises the following steps:
and 4, considering the tolerance of the positioning element, simulating the positioning process, establishing a box body machining reference reverse model by utilizing CAD software, keeping the central distance between the first hole and the second hole unchanged, and obtaining the maximum value of the vertical coordinate of the first hole and the minimum value of the vertical coordinate of the second hole on the box body hole system.
In the step 2, the contents of the positioning process of two holes on one surface are as follows: during positioning, the workpiece positioning hole is matched with the positioning pin, and the axis direction of the positioning pin is positioned on the clamp.
In the step 3, the diamond positioning pin hole on the box body is the maximum value, the diamond positioning pin on the clamp is the minimum value, the cylindrical positioning pin on the clamp is the maximum value, and the cylindrical positioning pin hole on the box body is the minimum value.
In the step 4, the diamond positioning pin hole on the box body is the minimum value, the diamond positioning pin on the clamp is the maximum value, the cylindrical positioning pin on the clamp is the minimum value, and the cylindrical positioning pin hole on the box body is the maximum value.
After adopting the scheme, the invention has the following characteristics:
(1) according to the geometric relation between the position of a box body hole system and a positioning element, the positioning process during machining is simulated, a CAD auxiliary tool is adopted to establish a box body machining basic size model diagram, a box body machining reference forward rotation model and a box body machining reference reverse rotation model, so that the basic size, the maximum size and the minimum size of a hole system vertical coordinate are determined, an AUTO CAD two-dimensional modeling method is adopted to determine the positioning reference rotation error of two holes on one side of the box body hole system machining, and the method has the advantages of good intuition, low cost and high precision;
(2) and automatically measuring the basic size, the maximum size and the minimum size of the vertical coordinate of the box body hole system by adopting a command under a CAD software 'marking' menu.
Drawings
FIG. 1 is a flow diagram of the present invention;
FIG. 2 is a diagram of a tank processing model;
FIG. 3 is a model diagram of basic dimensions of a tank body processing;
FIG. 4 is a schematic view of a reference forward model of box processing;
FIG. 5 is a schematic view of a tank machining reference inversion model.
Detailed Description
The technical solution and the advantages of the present invention will be described in detail with reference to the accompanying drawings.
The invention provides a method for determining positioning reference rotation error of two holes on one side of a box hole system, which is mainly realized by adopting a mode of CAD (computer aided design) auxiliary establishment of a two-dimensional model, and as shown in a combined figure 1, the box processing technology modeling refers to establishment of a box hole system processing geometric model and expression of a geometric relation between a processing hole system position and a positioning element. Basic dimension modeling refers to establishing a geometric relationship model between the positioning element and the position of the machining hole system when the tolerance of the positioning element is 0. Reference clockwise modeling refers to establishing a geometric model between the locating element and the hole system location when the locating element experiences a tolerance that results in a clockwise rotation of the reference. Reference reverse modeling refers to establishing a geometric model between the locating element and the bore system location when tolerances occur in the locating element that result in counterclockwise rotation of the reference. The method comprises the following specific steps:
1. box machining process modeling
According to the theory of mechanical drawing and machining process, the geometric relationship between the box hole system position and the positioning element is analyzed, a box machining process CAD model is drawn according to the ratio of 1:1, and the geometric relationship between the box hole system position and the positioning element is designed and expressed, as shown in figure 2.
FIG. 2 is a schematic view of a tank processing model. In fig. 2, 1 and 2 indicate 2 holes to be processed in a box body hole system, 3 indicates a diamond positioning pin hole on the box body, 4 indicates a diamond positioning pin on the clamp, and the diamond positioning pin 4 on the clamp is matched with the diamond positioning pin hole 3 on the box body; 5 represents a cylindrical positioning pin on the clamp, 6 represents a cylindrical positioning pin hole on the box body, and the cylindrical positioning pin 5 on the clamp is matched with the cylindrical positioning pin hole 6 on the box body. The two pin holes are matched to realize the positioning of the case body 1 and 2 during hole processing. For the purpose of visual inspection, the fit clearance of the two pin holes is drawn in an enlarged manner in fig. 2.
A denotes a horizontal coordinate (mm) of the hole 1, B denotes a vertical coordinate (mm) of the hole 1, E denotes a horizontal coordinate (mm) of the hole 2, F denotes a vertical coordinate (mm) of the hole 2, and L denotes a center distance (mm) between the dowel holes.
D1 represents dowel pin 6 diameter (mm), D2 represents dowel pin 3 diameter (mm), D1 represents dowel pin 5 diameter (mm), and D2 represents diamond dowel pin 4 diameter (mm).
JX denotes a positioning reference.
One-side two-hole positioning process: during positioning, the workpiece positioning pin hole is matched with the positioning pin, and the axis direction of the positioning pin is positioned on the clamp.
The generation process of the reference rotation error comprises the following steps: the JX datum rotation results in errors in the location of holes 1 and 2 due to manufacturing errors in the dowel pins and dowel hole holes.
2. Establishing a basic size model for box processing
On the basis of fig. 2, assuming that the manufacturing error of the positioning pin and the positioning pin hole is 0, according to the process theory, simulating the positioning process of two holes on one surface to establish the relationship between the positioning element and the hole system position, and establishing a two-dimensional model by using CAD software as shown in fig. 3.
Fig. 3 is a basic size model of box processing. All parameters in fig. 3 are as before. D1 — D1 is the basic size of the positioning elements 5, 6. D2-D2 is the basic size of the positioning element 3, 4.
3. Establishing box body processing benchmark clockwise rotation model
On the basis of FIG. 3, the positioning process is simulated by considering the tolerance of the positioning element, and a box body machining reference clockwise model is established by using CAD software as shown in FIG. 4.
In FIG. 4, A, E and L are as defined above. The pin 5 takes the maximum value D1max, the positioning pin hole 6 takes the minimum value D1min, the diamond pin 4 takes the minimum value D2min, and the positioning pin hole 3 takes the maximum value D2 max. The reference would now rotate clockwise to JX 1.
Under the new reference JX1, the vertical coordinate of hole 1 is automatically measured to obtain the minimum value Bmin and the vertical coordinate of hole 2 to obtain the maximum value Fmax by adopting the command under the CAD software 'label' menu.
4. Establishing a box body processing benchmark reversal model
On the basis of FIG. 3, the positioning process is simulated by taking the tolerance of the positioning element into consideration, and a box body machining reference reverse model is built by using CAD software as shown in FIG. 5.
In FIG. 5, A, E and L are as defined above. The pin 5 takes the minimum value D1min, the positioning pin hole 6 takes the maximum value D1max, the diamond pin 4 takes the maximum value D2max, and the positioning pin hole 3 takes the minimum value D2 min. At this time, the reference is rotated counterclockwise to JX 2.
Under the new reference JX2, the vertical coordinate of well 1 is automatically measured to obtain the maximum value Bmax and the vertical coordinate of well 2 to obtain the minimum value Fmin, using the commands under the CAD software "mark" menu.
The invention can be applied to mechanical design and manufacture and automobile design and manufacture. Examples of applications are given in table 1, where Bmax, Bmin, Fmax, Fmin data are the results obtained by the present invention, and the rest of the data are given by design. The parameters are defined as before.
TABLE 1 calculation scheme and result of positioning reference rotation error of two holes on one side of box processing
| Serial number | Parameter(s) | Dimension line | Computing scheme | Serial number | Parameter(s) | Dimension line | Computing scheme |
| 1 | A | mm | 120.00 | 12 | D1min | mm | 14.00 |
| 2 | E | mm | 210.00 | 13 | d1 | mm | 14.00 |
| 3 | L | mm | 305.00 | 14 | D2 | mm | 20.00 |
| 4 | B | mm | 165.00 | 15 | d2 | mm | 20.00 |
| 5 | F | mm | 220.00 | 16 | d1max | mm | 14.017 |
| 6 | D1 | mm | 20.00 | 17 | D2max | mm | 20.021 |
| 7 | Bmax | mm | 165.012 | 18 | d2max | 20.02 | |
| 8 | Fmax | mm | 220.002 | 19 | d1min | 14.006 | |
| 9 | D1max | Mm | 14.018 | 20 | D2min | 20.00 | |
| 10 | Bmin | mm | 164.985 | 21 | d2min | 20.007 | |
| 11 | Fmin | mm | 43.995 | 22 |
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modifications made on the basis of the technical scheme according to the technical idea of the present invention fall within the protection scope of the present invention.
Claims (2)
1. A method for determining the positioning reference rotation error of two holes on one side of a box hole system processing surface is characterized by comprising the following steps:
step 1, drawing a box body machining process CAD model according to a ratio of 1:1, embodying a geometric relation between box body hole series positions and positioning elements, and JX representing a positioning reference; because a positioning pin on the clamp and a positioning pin hole on the box body have manufacturing errors, the JX reference rotates to cause position errors of a first hole and a second hole on a box body hole system;
step 2, assuming that the manufacturing error of a diamond positioning pin on the clamp and a diamond positioning pin hole on the box body is 0, and the manufacturing error of a cylindrical positioning pin on the clamp and a cylindrical positioning pin hole on the box body is 0, simulating a two-hole positioning process on one surface to establish the relationship between a positioning element and the hole system position, establishing a two-dimensional model by using CAD software, and defining the horizontal coordinate A of a first hole and the horizontal coordinate E of a second hole on the hole system of the box body;
step 3, considering the tolerance of the positioning element, simulating the positioning process, establishing a box body processing reference forward model by utilizing CAD software, keeping the center distance between the first hole and the second hole unchanged, and obtaining the minimum value of the vertical coordinate of the first hole and the maximum value of the vertical coordinate of the second hole on the box body hole system by adopting the command under the menu of 'marking' of the CAD software under the new reference JX 1; wherein, the new reference JX1 refers to: the diamond positioning pin hole on the box body is the maximum value, the diamond positioning pin on the clamp is the minimum value, the cylindrical positioning pin on the clamp is the maximum value, and the cylindrical positioning pin hole on the box body is the minimum value;
step 4, considering the tolerance of the positioning element, simulating the positioning process, establishing a box body processing reference reversal model by utilizing CAD software, keeping the central distance between the first hole and the second hole unchanged, and under a new reference JX2, adopting the CAD software to 'mark' a command under a menu to obtain the maximum value of the vertical coordinate of the first hole and the minimum value of the vertical coordinate of the second hole on the box body hole system; wherein, the new reference JX2 refers to: the diamond-shaped positioning pin hole on the box body is the minimum value, the diamond-shaped positioning pin on the clamp is the maximum value, the cylindrical positioning pin on the clamp is the minimum value, and the cylindrical positioning pin hole on the box body is the maximum value.
2. The method for determining the positioning reference rotation error of two holes on one surface processed by the box hole system as claimed in claim 1, wherein: in the step 2, the contents of the positioning process of two holes on one surface are as follows: during positioning, the workpiece positioning hole is matched with the positioning pin, and the axis direction of the positioning pin is positioned on the clamp.
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