CN101706837A - Mathematical model based method for establishing database of fixture components - Google Patents

Abstract

A mathematical model based method for establishing a database of fixture components is characterized by comprising the following steps: (1) establishing the corresponding mathematical model of the fixture components; (2) establishing a three-dimensional model template file of the fixture components in a computer; (3) selecting the corresponding template file of the fixture components through human-computer interaction and inputting the structure size of one fixture component; (4) updating and displaying a designed three-dimensional solid model of the fixture components; and (5) setting the names and the storage paths of the fixture components for calling when designing the fixture. The method has the following advantages: 1. the established mathematical model only has one independent parameter; therefore, the method can provide theoretical basis for the design of non-standard parts and can be expanded to the parametric design field of other mechanical standard parts; 2. the method accelerates the speed of dynamic update of the model, thus solving the following problems in the prior art: the drive parameters are more, the efficiency is low, the database occupies more system resources, etc.

Description

Fixture storehouse method for building up based on mathematical model

Technical field

The present invention relates to a kind of fixture method for designing, relate in particular to a kind of fixture storehouse method for building up based on mathematical model.

Background technology

Jig directly influences the quality and the lead time of product as a kind of important technological equipment in the machinery manufacturing industry.Shortening the jig Design cycle, improving the jig Design quality is to improve a key link of enterprise's quick-reaction capability (QRC).The foundation of jig standard component then is an important step of Computer Aided Fixture Design, also is an important content of Computer Aided Fixture Design system development.The quick design of three-dimensional standard component can improve production preparatory period, the simplification jig Design process of anchor clamps greatly, and then the shortening Products Development cycle plays considerable effect.

When the designer is engaged in jig Design work on design platform, should not there is no need to repeat to draw all kinds of standard components yet, and this numerous and diverse, trifling work very likely interrupts opening one's minds of deviser, therefore uses the Fast design method of standard component can allow the deviser free from loaded down with trivial details computer-aided mapping.

Usually adopt parametric design method to set up corresponding component library for seriation, standardized fixture, perhaps set up its template corresponding, change some or all sizes of template graphics then according to standard size, automatically finish change, set up the cad model of a standard fixture element relevant portion in the figure.When the design fixture, this method must " the jig Design handbook be searched the fixture geometric dimensions of dissimilar different sizes according to being correlated with in advance.

Summary of the invention

The object of the present invention is to provide a kind of fixture storehouse method for building up based on mathematical model, this method utilization priority number and preferred numbers theory, set up the mathematical model of restriction relation between each parameters of structural dimension of fixture, it is independent variable that a dimensional parameters is only arranged in these mathematical models; Then according to the fixture mathematical model, the template file of setting up fixture is as element father part, call, import a parameter during design after, can drive the design that all parameters realize fixtures.

The present invention is achieved like this, and it is characterized in that method step is:

(1), sets up its corresponding mathematical model according to the fixture of same type, different size;

(2), in computing machine, set up the three-dimensional model boilerplate of fixture according to the fixture mathematical model;

(3) corresponding fixture template file is selected in man-machine interaction, the physical dimension of a fixture of input;

(4) generate the one group of design parameter that can control three-dimensional model shape and size fully, the fixture three-dimensional entity model that update displayed is designed;

(5) title, the store path of fixture are set, call during in order to the design anchor clamps.

The present invention sets up father's part of fixture by template file, defines shape and size that each dimensional parameters comes controlling models, and dimensional parameters is with reference to " jig design manual ".

The present invention is by the rule between each physical dimension of fixture, utilizes priority number and preferred numbers theory to set up functional relation between the fixture dimensional parameters, and in these functional relations, having only a dimensional parameters is independent variable.

The present invention realizes the driving of other dimensional parameters by major dimension parameter of input, finishes the renewal to the fixture model.

Priority number and preferential the genus are regular strong, be convenient to the relation between analytical parameters, the specification that priority number and preferred numbers theory is used for not only can covering the parametrization design of fixture same kind different series, and practice also proves, all products that can correctly use the preferred numbers design, its parameter series generally all compares rationally, available less description satisfies the needs in the relative broad range, and be convenient to coordinate the cooperation between national economy all departments or each specialty, the major parameter of product forms series by preferred numbers, can make product go on seriation, standardized track.

Utilization the fixture method for designing that the present invention set up based on mathematical model, can reach the requirement of Computer Aided Fixture Design fully, be with a wide range of applications, its thought is not only in the jig Design field, can also be extended to the parametrization design field of other machinery standard spare, the guidance of theoretical property also can be provided for the design of non-standard component simultaneously.In addition, the present invention relies on the constraint between mathematical model realization fixture size, has avoided softwares such as use large database, has solved the many problems of data occupancy system resource.

Advantage of the present invention is: 1, have only an independent parameter in the mathematical model of Jian Liing, the design that therefore can be non-tender is provided fundamental basis, and can be extended to the parametrization design field of other machinery standard spare; 2, realize driving simultaneously the generation of fixture cad model, only need boilerplate when therefore designing fixture, do not need to set up the fixture storehouse by single size rather than a plurality of size; Thereby improve the speed that model dynamically updates greatly, driving parameters is many in the solution prior art, efficient is low, database occupies problems such as system resource is many.

Description of drawings

Fig. 1 is the used A type of the present invention (register pin of D＞3-18).

Fig. 2 is used A type (D＞18) register pin of the present invention.

Fig. 3 is the register pin design template of the present invention's exploitation.

Fig. 4 is a design process synoptic diagram of the present invention.

Embodiment

The present invention is described in further detail below in conjunction with drawings and Examples, but this embodiment should not be construed as limitation of the present invention.

Embodiment 1:

With fixed register pin illustrated in figures 1 and 2 is example, sets up the method for designing of register pin.

The first step: the mathematical model of setting up register pin

The principal character size of register pin is as shown in table 1, has only one to be independent variable in these sizes, and other size then is the function of this independent variable.

Table 1 register pin part key dimension (selecting from GB2203-80)

As shown in table 1, be independent variable with dimensional parameters D, because D is divided into 9 size section, so with i, define the ident value of each size section, therefore, i=1,2 ..., 9.According to priority number and preferred numbers theory, that each size Expressing is as follows:

The relation of D＜18 o'clock each size is as follows:

d＝int(6×1.26 ^i-3+0.5)

$D1=\mathrm{int}(10\×{1.12}^{i+1}+0.4)+2\mathrm{int}\left(\frac{i}{5}\right)$

The relation of D＞18 o'clock each size is as follows:

$d=\mathrm{int}(3\×{1.06}^{2i+\frac{i-8.5}{2}{(-1)}^i+13.25}-0.26)+\mathrm{int}\left(\frac{i-5}{5}\right)+\mathrm{int}\left(\frac{1}{i-5}\right)$

$C=\mathrm{int}({1.12}^{\frac{i}{2}+11}+0.3)$

Second step: the model of setting up register pin

Select for use Large-scale CAD software UG to create the solid model of register pin.Selecting the design dialog interface of MFC exploitation register pin for use, is input parameter with register pin diameter D only, as shown in Figure 3.

The 3rd step: the register pin of design

According to designing requirement, input register pin diameter parameters, other size then drive by numerical relationship model determines that the resulting register pin of update displayed selects store path to preserve, as shown in Figure 4.

The present invention is designed to core with the parametrization of typical fixture, set up the functional relation of each dimensional parameters of fixture based on priority number and preferred numbers theory, realized the fixture method for designing that single size drives, supply the jig Design personnel at Computer Aided Fixture Design (CAFD, Computer AidedFixture Design) using in the process. the present invention only needs boilerplate, do not need to set up the fixture storehouse, greatly improved the speed that model dynamically updates, it is many to have solved in the prior art driving parameters, efficient is low, database occupies problems such as system resource is many, while also provides theoretical foundation for the design of non-tender, and can be extended to the parametrization design field of other machinery standard spare.

Claims (4)

1. fixture storehouse method for building up based on mathematical model is characterized in that method step is:

(1), sets up its corresponding mathematical model according to the fixture of same type, different size;

(2), in computing machine, set up the three-dimensional model boilerplate of fixture according to the fixture mathematical model;

(3) corresponding fixture template file is selected in man-machine interaction, the physical dimension of a fixture of input;

(4) generate the one group of design parameter that can control three-dimensional model shape and size fully, the fixture three-dimensional entity model that update displayed is designed;

(5) title, the store path of fixture are set, call during in order to the design anchor clamps.

2. the fixture storehouse method for building up based on mathematical model according to claim 1, it is characterized in that setting up father's part of fixture by template file, define shape and size that each dimensional parameters comes controlling models, dimensional parameters is with reference to " jig design manual ".

3. the fixture storehouse method for building up based on mathematical model according to claim 1, it is characterized in that by the rule between each physical dimension of fixture, utilize priority number and preferred numbers theory to set up functional relation between the fixture dimensional parameters, in these functional relations, having only a dimensional parameters is independent variable.

4. the fixture storehouse method for building up based on mathematical model according to claim 1 is characterized in that realizing the driving of other dimensional parameters by importing a major dimension parameter, finishes the renewal to the fixture model.

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