Intelligent computing method for dimensional chain
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A calculation method and dimension chain technology, applied in calculation, special data processing applications, instruments, etc., can solve the problems of manual calculation error-prone, difficult to adapt to three-dimensional size solution, time-consuming, etc.
Active Publication Date: 2015-03-11
BEIJING INSTITUTE OF TECHNOLOGYGY
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The size tracking method belongs to the graphic method. The search, analysis, and solution of the process size chain components are realized through the size chain diagram.
The graph theory method uses the relevant knowledge of graph theory to solve the dimension chain. Compared with the dimension tracking method, the representation of the dimension chain is much more intuitive, but the calculation operation of the computer is still very complicated.
The dimensional method uses the dimensional formula to express the relationship between dimensions, which can give full play to the advantages of the computer and realize the automatic calculation of the computer, but the size capacity represented is limited, and it is basically used to solve the plane size chain. Today, the three-dimensional technology is increasingly emerging. , it is difficult to adapt to the solution of the dimension chain of many three-dimensional dimensions of complex parts
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Embodiment 1
[0029] The first step, for the parts to be processed, determine the process size according to the processing process, determine the closed loop and the constituent ring with the process size, take the reference plane when the process size is processed as the starting point, and take the processed surface when the process size is processed as the end point, A size vector is established, the vector of the closed ring is expressed as the closed size vector c, and the vectors forming the ring are expressed as the component size vector.
[0030] In the dimension vector, positive and negative symbols are used to indicate the direction, and the positive sign is the increasing vector, and the negative sign is the decreasing vector; vector, the method for judging whether the established size vector is an increasing vector or a decreasing vector is:
[0031] When the end point of one size vector is the same as the end point of another size vector, if the two size vectors are in the same...
Embodiment 2
[0046] According to the scheme given in the above-mentioned embodiment 1, this embodiment will take a specific process of a stepped shaft as an example to describe the above-mentioned scheme in detail: the stepped shaft used in this embodiment is as follows figure 2 As shown, its technological process is:
[0047] Process 5: Finishing the B and D sides to ensure the dimensions AB and BD, such as image 3 shown.
[0048]Process 10: Finish turning C surface, ensure dimension AC, such as Figure 4 shown.
[0049] Step 15: heat treatment.
[0050] Process 20: Grinding surface A to ensure size 40 -0.1 ,like Figure 5 shown.
[0051] In the last process, it is necessary to ensure that the size 140 -0.3 , so the dimension vector is a closed dimension vector, and the determination process of each constituent ring (dimension vector) and its increase or decrease is as follows:
[0052] Set comparison point 1 as the start point D of closed dimension vector 6 6 , set the compari...
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Abstract
The invention discloses an intelligent computing method for a dimensional chain and belongs to the field of mechanical precision design. The method comprises the following steps of establishing dimensional vectors which comprises a closed dimensional vector c and a unit dimensional vector by taking a reference plane of a part to be machined during machining of a procedure size as a starting point and taking a machined surface as a terminal point; representing directions of the dimensional vector by using positive and negative symbols; taking the starting point and the terminal point of the closed dimensional vector as two initial comparative points, comparing the two comparative points with the terminal point of each dimensional vector according to a sequence from vicinity to far between the procedure and the closed dimensional vector, updating the comparative points until the two comparative points are the same, if the terminal point of each dimensional vector is the same as the comparative points, acquiring dimensional vectors a and b of the two comparative points, establishing a dimensional vector equation, arranging c on one side of the equation and arranging and adding a and b on the other side of the equation; calculating the unknown dimensional vector. The method can break through the limitation of dimension in the traditional dimensional formulation method, and is suitable for computer storage and computation of the dimensional chain in the three-dimensional size.
Description
technical field [0001] The invention relates to a calculation method for a dimension chain, which belongs to the field of mechanical precision design, in particular to an intelligent calculation method for a dimension chain suitable for computer applications. Background technique [0002] During the machining process, there will be errors in each dimension of the parts, and the relationship between these errors and dimensions will form a process dimension chain. In the process of processing, there are many processes and many sizes, so it is easy to appear that the design benchmark and the process benchmark do not coincide. At this time, it is necessary to convert the size and determine the process size and its tolerance reasonably. At present, the calculation of process size chain usually includes size tracking method, graph theory method and size formula method. The size tracking method belongs to the graphic method. The search, analysis, and solution of the process size c...
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