CN111609827A - Construction method of theoretical precise datum plane of engine cylinder block and engine cylinder block - Google Patents
Construction method of theoretical precise datum plane of engine cylinder block and engine cylinder block Download PDFInfo
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- CN111609827A CN111609827A CN201910141215.8A CN201910141215A CN111609827A CN 111609827 A CN111609827 A CN 111609827A CN 201910141215 A CN201910141215 A CN 201910141215A CN 111609827 A CN111609827 A CN 111609827A
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- fine reference
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- reference surface
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- shape data
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- G—PHYSICS
- 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
- G01B21/20—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring contours or curvatures, e.g. determining profile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/002—Measuring arrangements characterised by the use of optical techniques for measuring two or more coordinates
- G01B11/005—Measuring arrangements characterised by the use of optical techniques for measuring two or more coordinates coordinate measuring machines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
The invention relates to a construction method of a theoretical precise datum plane, which is used for an engine cylinder body. The construction method of the theoretical precise reference surface comprises the following steps: randomly selecting three processing surfaces of an engine cylinder body as three actual precise reference surfaces; tracing the three actual fine reference surfaces all the time, and acquiring shape data of the three actual fine reference surfaces; and under the condition that the three actual fine reference surfaces are positioned on the same plane, fitting a theoretical fine reference surface of the engine cylinder block based on the shape data.
Description
Technical Field
The invention relates to machining measurement of an engine cylinder block, in particular to construction of a theoretical precise datum plane of the engine cylinder block.
Background
As the most interfaced component of the engine, the engine block not only occupies a large weight proportion and volume proportion in the whole engine system, but also carries many other components in the engine system. Due to the weight and volume of the engine cylinder body and the functions of bearing other parts borne by the engine cylinder body, the machining precision of the engine cylinder body is required to reach a higher precision level.
In order to achieve a high machining precision of the engine cylinder block, the machining process of the engine cylinder block needs to be efficient and accurate and the measurement procedure of the engine cylinder block needs to be accurate. The realization of the above requirements needs to be started from the theoretical precise standard for constructing the cylinder body.
When a theoretical fine reference is constructed using a conventional method, shape data of an actual fine reference plane is often acquired by means of a special gauge or a method of using three-coordinate dotting. However, this method cannot realize closed track scanning on the actual fine reference surface, which results in low precision of the theoretical fine reference surface constructed thereby, and further has a great influence on subsequent measurement. For a plurality of step-distributed precise reference surfaces, the traditional measurement method is to fit the shape data of a plurality of actual precise reference surfaces into a theoretical origin before offset, and then to finish the fitting of the theoretical precise reference by offsetting the theoretical origin. However, the theoretical fine reference construction method is only based on a single point after offset fitting into a theoretical fine reference plane, so that the actual fine reference plane data is distorted to a certain extent, and the shape and position accuracy of the theoretical fine reference plane are affected. In addition, the traditional method for constructing the theoretical fine reference surface usually obtains the theoretical fine reference surface by fitting four actual fine reference surfaces, which easily causes the over-positioning of the reference in the machining process.
Disclosure of Invention
In view of the above, it is therefore an object of the present invention to provide a method of constructing a theoretical fine reference plane of an engine block, for achieving a higher accuracy of the theoretical fine reference plane of the block.
Specifically, the invention provides a construction method of a theoretical precise reference surface, which is used for an engine block and comprises the following steps:
randomly selecting three processing surfaces of an engine cylinder body as three actual precise reference surfaces;
tracing the three actual fine reference surfaces all the time, and acquiring shape data of the three actual fine reference surfaces;
and under the condition that the three actual fine reference surfaces are positioned on the same plane, fitting a theoretical fine reference surface of the engine cylinder block based on the shape data.
According to an embodiment of the invention, in the case that the three actual fine reference surfaces are distributed in a step shape, the shape data are biased to the same plane, and the shape data after fitting the bias become the theoretical fine reference surface of the engine block.
According to an embodiment of the present invention, the method for constructing the theoretical fine reference plane further includes the steps of:
randomly selecting a fourth actual fine reference surface different from the three actual fine reference surfaces;
and measuring the fourth actual fine reference surface by using the theoretical fine reference surface.
According to an embodiment of the present invention, in selecting three machined surfaces of the engine block as three actual fine reference surfaces, the machined surface having the largest number of mounted components is preferentially selected.
According to an embodiment of the invention, the shape data and/or the biased shape data are fitted using a least squares method when fitting the theoretical fine reference plane.
According to one embodiment of the invention, wherein the three actual fine reference planes are traced and the shape data of the three actual fine reference planes are acquired using a three-coordinate apparatus.
According to an embodiment of the invention, when the fourth actual fine reference plane is measured by using the theoretical fine reference plane, the parallelism of the fourth actual fine reference plane with respect to the theoretical fine reference plane is measured.
According to another aspect of the invention, the invention also provides an engine block, wherein the engine block is processed according to the theoretical fine reference surface of the block constructed according to any one of the embodiments of the theoretical fine reference surface construction method. The engine block has a higher machining accuracy than engine blocks produced by conventional machining measurement methods.
Drawings
The above and other objects and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which like or similar elements are designated by like reference numerals.
FIG. 1 schematically illustrates a top view of an engine block; and
FIG. 2 schematically illustrates steps of a method for constructing a theoretical fine reference surface of an engine block according to the present disclosure.
Detailed Description
For the purposes of brevity and explanation, the principles of the present invention are described herein with reference primarily to exemplary embodiments thereof. However, those skilled in the art will readily recognize that the same principles are equally applicable to the method of construction of theoretical precision reference surfaces for all types of engine blocks, and that these same or similar principles may be implemented therein, with any such variations not departing from the true spirit and scope of the present patent application. Moreover, in the following description, reference is made to the accompanying drawings that show specific exemplary embodiments. Changes may be made in these embodiments without departing from the spirit and scope of the invention. In addition, while a feature of the invention may have been disclosed with respect to only one of several implementations/embodiments, such feature may be combined with one or more other features of the other implementations/embodiments as may be desired and/or advantageous for any given or identified function. The following description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims and their equivalents.
FIG. 1 schematically illustrates a top view of an engine block. As can be seen from fig. 1, a number of functional components are arranged or mounted at the engine block. Furthermore, fig. 1 also shows exemplary four actual reference surfaces 10 of an arbitrarily selected engine block. The method of constructing a theoretical fine reference surface according to the present disclosure can be implemented on such an engine block as shown in fig. 1.
Fig. 2 exemplarily shows a flow of a method for constructing a theoretical fine reference surface of an engine block according to the present disclosure. Here, as can be seen from fig. 2, when constructing the theoretical precise reference surface of the engine block, first, three different machined surfaces of the engine block may be arbitrarily selected as three actual precise reference surfaces. Preferably, the machined surface with the largest number of installed components can be selected as the three actual precise reference surfaces as much as possible, which can be more beneficial to improving the machining precision of each component of the engine block. Then, the three actual fine reference planes are preferably traced over and shape data of the three actual fine reference planes are acquired. Here, various methods may be employed to acquire shape data of the actual fine reference plane throughout. Preferably, the shape data of the actual fine reference surface of the engine block may be acquired by means of a trajectory scan using a three-coordinate apparatus. Of course, it is also conceivable to acquire shape data of the actual fine reference surface by using other equipment, for example, laser scanning, infrared scanning, or the like.
On the basis of this, as shown in fig. 2, the three selected actual fine reference surfaces may exist in the same plane or may be distributed in a stepped manner. Illustratively, in a case where the three actual fine reference surfaces are located on the same plane, the theoretical fine reference surface of the engine block is fitted based on the shape data acquired above. In this case, different methods can be used to fit the theoretical fine reference surface of the engine block. Preferably, the acquired shape data may be processed using a least squares method and then fitted out of a theoretical fine datum plane of the engine block. Of course, it is also contemplated to fit the theoretical fine reference plane in other ways. Meanwhile, under the condition that the three actual precise reference surfaces are distributed in a step shape, the shape data are biased to the same plane, and the shape data after the bias fitting is formed into a theoretical precise reference surface of the engine cylinder block. Here again, preferably, the shape data after the offset may be processed using a least squares method and then fitted out to a theoretical fine reference plane of the engine block. Of course, it is also contemplated to fit the theoretical fine reference plane in other ways.
After the theoretical fine reference surface of the engine cylinder block is obtained, preferably, a machined surface different from the three machined surfaces can be selected as a fourth actual fine reference surface at the cylinder block. The fourth actual fine reference surface may be measured by using the fitted theoretical fine reference surface of the engine block, so as to detect the accuracy of the fourth actual fine reference surface. In this case, for example, when the fourth actual fine reference plane is measured using the theoretical fine reference plane, the parallelism of the fourth actual fine reference plane with respect to the theoretical fine reference plane is measured. When the parallelism does not meet the specified tolerance range, the fourth actual fine reference surface can be adjusted, so that the machining accuracy of the engine cylinder block is improved.
Further, with any of the embodiments of the theoretical fine reference surface construction method described above, it is possible to produce and manufacture an engine block having higher machining accuracy than a block obtained with a conventional machining measurement method.
The above examples mainly illustrate the method of constructing the theoretical precise reference surface of the engine block of the present disclosure. Although only a few embodiments of the present invention have been described, those skilled in the art will appreciate that the present invention may be embodied in many other forms without departing from the spirit or scope thereof. Accordingly, the present examples and embodiments are to be considered as illustrative and not restrictive, and various modifications and substitutions may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.
Claims (8)
1. A construction method of a theoretical fine reference surface is used for an engine cylinder block, and is characterized by comprising the following steps:
randomly selecting three processing surfaces of an engine cylinder body as three actual precise reference surfaces;
tracing the three actual fine reference surfaces all the time, and acquiring shape data of the three actual fine reference surfaces;
and under the condition that the three actual fine reference surfaces are positioned on the same plane, fitting a theoretical fine reference surface of the engine cylinder block based on the shape data.
2. The method of constructing a theoretical fine reference surface according to claim 1, wherein in a case where the three actual fine reference surfaces are distributed in a stepwise manner, the shape data is offset onto the same plane, and the offset shape data is fitted to become the theoretical fine reference surface of the engine block.
3. The method for constructing a theoretical fine reference surface according to claim 2, wherein the method for constructing a theoretical fine reference surface further comprises the steps of:
randomly selecting a fourth actual fine reference surface different from the three actual fine reference surfaces;
and measuring the fourth actual fine reference surface by using the theoretical fine reference surface.
4. The method of constructing a theoretical precision reference surface according to claim 2, wherein when three machined surfaces of the engine block are selected as the three actual precision reference surfaces, the machined surface having the largest number of mounted parts is preferentially selected.
5. The method of constructing a theoretical fine reference plane according to claim 2, wherein the shape data and/or the biased shape data are fitted by a least square method when the theoretical fine reference plane is fitted.
6. The method of constructing a theoretical fine reference surface according to claim 1, wherein a three-coordinate apparatus is used to perform tracing and obtain shape data of the three actual fine reference surfaces.
7. The method for constructing a theoretical fine reference surface according to claim 3, wherein when the fourth actual fine reference surface is measured using the theoretical fine reference surface, a parallelism of the fourth actual fine reference surface with respect to the theoretical fine reference surface is measured.
8. An engine block characterized in that the engine block is constructed with its theoretical fine reference surface when machined according to the method of construction of theoretical fine reference surface of any one of claims 1 to 7.
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| CN201910141215.8A CN111609827B (en) | 2019-02-26 | 2019-02-26 | Construction method of theoretical precise datum plane of engine cylinder block and engine cylinder block |
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| CN201910141215.8A CN111609827B (en) | 2019-02-26 | 2019-02-26 | Construction method of theoretical precise datum plane of engine cylinder block and engine cylinder block |
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| CN111609827B CN111609827B (en) | 2022-01-11 |
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