JP4779508B2 - Bearing design system - Google Patents

Description

  The present invention relates to a graphic processing system that executes design and drafting in accordance with input data based on predetermined design rules.

  Conventionally, in a graphic processing system such as a CAD system, a predetermined design rule (hereinafter referred to as “design rule”) is incorporated in a dimension calculation program.

  The dimension calculation program is prepared based on the target design and drawing image. For example, in the case of bearing design, the bearing dimension calculation program is applied.

  Also in this bearing dimension calculation program, the design rule is incorporated, and drawing (basic image) is executed by inputting the basic design dimension.

  By the way, in the case of a bearing, the dimensional tolerance between the bearing body on the fixed side and the rotating body (for example, roller) on the rotating side is important, and when these are fitted together and assembled, the roller rotates smoothly. Whether or not to do so is determined by creating a so-called hit figure (actual fitting image).

  For this reason, the designer manually calculates the dimensions based on the detailed dimensions obtained from the automatically drawn basic image, taking into account dimensional tolerances, etc., and creates a hit figure. The necessary parameters are read to determine the suitability of the fitted state.

  As a related technique, it has been proposed that the design specification value of a product can be optimized by an analysis obtained from two or more different viewpoints and a comprehensive judgment from an evaluation result (see Patent Document 1). ).

In Patent Document 1, a data input processing unit that inputs product specifications, evaluation items, etc., a program storage control unit that manages an analysis program group, an analysis execution control unit that executes an analysis program and obtains an analysis result for each evaluation item, results And a trade-off evaluation unit for obtaining a design value that maximizes the evaluation formula from the analysis result.
Japanese Patent Laid-Open No. 5-41443

  However, as in the past, creating a hit figure manually requires a lot of labor, and there is a high possibility that work efficiency will decrease due to manual input of dimensional values, etc. The quality is degraded.

  Moreover, in the technique of the above-mentioned Patent Document 1, only a compromise point (trade-off cross point) is obtained from two different viewpoints. The difference is not obtained.

  In consideration of the above facts, the present invention automatically creates a basic image and an actual fitting image between members to be fitted to each other, and also automates the comparison to each other and the determination of the suitability of the basic dimensions, thereby making an input error. The object of the present invention is to obtain a graphic processing system that can improve the work efficiency.

  The present invention is a graphic processing system that executes design and drafting in accordance with input data based on predetermined design rules, and each of the shapes of a plurality of members that fit together as the input data A data input means for inputting a basic dimension for specifying the position, a detailed dimension calculation means for automatically calculating a detailed dimension of each member from a basic image drawn with the data input by the data input means, An actual fitting position calculating means for calculating an actual fitting position in consideration of a dimensional tolerance between the mating members, and an actual fitting position calculated by the actual fitting position calculating means based on the basic image; An actual fitting image drawing means for drawing an actual fitting image; a determination means for determining whether the basic dimensions are acceptable as the input data based on a relative positional relationship between the basic image and the actual fitting image; It has.

  According to the present invention, the data input means inputs the basic dimensions for specifying the shapes of the plurality of members that fit together. Next, the detailed dimensions of each member are automatically calculated from the basic image drawn with the data input by the data input means (detailed dimension calculating means).

  By the way, between the members fitted to each other, the relative positional relationship may be different from the drawing position (basic image position) based on the input data (actual fitting position) due to mutual dimensional tolerances. In particular, in order to perform relative rotation after fitting, a certain amount of negative dimension tolerance is required, and the design position may not be appropriate.

  Therefore, the actual fitting position calculation means calculates an actual fitting position in consideration of the dimensional tolerance between the members fitting with each other, and then the actual fitting image drawing means calculates the actual fitting based on the basic image. An actual fitting image is drawn at the actual fitting position calculated by the matching position calculation means.

  The determination means determines whether the basic dimensions are acceptable as the input data based on the relative positional relationship between the basic image and the actual fitting image.

  By automating all of the above, errors such as manual input can be avoided and work efficiency and design quality can be improved.

  In the above invention, the actual fitting position calculating means stores in advance a figure pattern database storing appropriate figure patterns in a plurality of types of mutually fitting members that can be predicted, and a fitting to each other specified based on the input data A graphic pattern reading means for reading out an appropriate graphic pattern from the graphic pattern database based on the basic dimensions of the mating members, and a graphic deformed based on the detailed dimensions with respect to the graphic pattern read by the graphic pattern reading means And a deformation means.

  The actual fitting position calculation means reads an appropriate graphic pattern from the graphic pattern database based on the basic dimensions of the mating members specified based on the input data, and for the read graphic pattern, Deforms based on detailed dimensions.

  Since the figure pattern in which the relative position between the basic image and the actual fitting image is displaced can be specified to some extent in the members fitted to each other, if the figure pattern that can be predicted in advance is stored in a database, the calculation is easy. Become.

  Further, in the above invention, the members that fit together are bearings constituted by a bearing body in which a tapered groove is formed and a roller that is housed in the groove and rotates about its axis. Yes.

  This is a typical embodiment of members that fit together, and includes a bearing in which a roller rotates by accommodating the roller in a tapered groove formed in the bearing body. Since how much the roller sinks in the groove is not known in the basic dimensions, an actual fitting image is required.

  By automatically creating this actual fitting image, it can be accurately determined whether or not the roller smoothly rotates in the bearing body.

  As described above, in the present invention, the basic image and the actual fitting image between the members to be fitted to each other are automatically created, and the comparison to each other and the determination of whether or not the basic dimensions are appropriate are automated, thereby eliminating an input error. It has an excellent effect that it can avoid and improve the working efficiency.

  FIG. 1 is a schematic configuration diagram of a CAD system 10. The CAD system 10 is almost the same as a personal computer in terms of hardware configuration, and a keyboard 14 and a mouse 16 serving as an input unit 12 are connected to a control unit 18, and an image drawn on the control unit 18. Is connected. In some cases, by installing CAD system software on a personal computer, the hardware configuration of the personal computer can be directly used as a CAD system.

  Although not shown, the CAD system 10 may be connected to a scanner that reads a basic shape as image data, an XY plotter that prints out an image of the constructed three-dimensional model shape, and the like.

  The CAD system 10 according to the present embodiment has a function of creating a drawing intended for an assembly drawing of a pair of members that are fitted together, such as a rolling bearing, and determining whether or not it is actually fitted. System.

  FIG. 2 is a functional block diagram showing the control in the control unit 18 mainly including the function of determining the state when the bearing is assembled in addition to the basic function of the CAD system.

  The input unit 12 is connected to the basic dimension extraction unit 22. The basic dimension extraction unit 22 extracts the minimum necessary basic dimension data (outer diameter, inner diameter, width dimension) for specifying the shape of the bearing 50 (see FIG. 3) from the data input from the input unit 12.

  The basic dimension extraction unit 22 is connected to a detailed dimension calculation unit 24. When basic dimension data is sent from the basic dimension extraction unit 22 to the detailed dimension calculation unit 24, the detailed dimension calculation unit 24 reads a predetermined design rule from the design rule database 26 and is necessary for drawing the bearing 50. Detailed dimensions are calculated.

  The detailed dimensions calculated by the detailed dimension calculation unit 24 are connected to the basic image data generation unit 28, the geometric calculation parameter calculation unit 30, and the hit figure automatic creation unit 32.

  The basic image data generation unit 28 generates basic image data by inputting the detailed dimensions calculated by the detailed dimension calculation unit 24. The generated basic image data is sent to the display control unit 34, sent to the monitor 20 via the display driver 36, and displayed on the monitor 20.

  On the other hand, when a detailed dimension is inputted from the detailed dimension calculation unit 24 to the hit figure automatic creation unit 32, a hit figure is automatically created (details will be described later).

And the per view, as shown in FIG. 3 is a diagram roller 52 constituting the bearing 50, to identify the position when fitted to the center pillar 54A of the bearing body 54 in reality. The bearing 50 or the like is a product that needs to be rolled in a state of being fitted to each other, and has a specific dimensional tolerance for facilitating the rolling. Therefore, the position may be different from the position of the roller 52 as the basic image.

  More specifically, as shown in FIG. 3, the roller 52 has a structure that is supported by the central column 54A of the bearing body 54, and the position indicated by the chain line is the actual position of the roller 52 as a basic image. is there.

  On the other hand, it can be seen that the position of the roller 52 when the hit figure is created sinks with respect to the position of the chain line as shown by the solid line in FIG.

  In this embodiment, as a parameter for comparing the position of the roller 52 in the basic image with the position of the roller 52 on the drawing, the roller from the outermost circle (refer to the one-dot chain line A in FIG. 3) of the bearing body 54 is used. The sagging dimension x to the outer periphery of 52 is used. Hereinafter, the dimension x on the basic image is distinguished as the dimension xk, and the dimension x on the drawing is distinguished as the dimension xa.

  The hit figure automatic creating unit 32 is connected to a hit figure automatic creating program storage unit 38.

  When necessary data is given to the hitting diagram automatic creation program storage unit 38, a series of procedure descriptions for deforming a figure parametrically and a bearing performance parameter (dimension xa) after deformation are automatically displayed on CAD. A description that can be obtained is registered.

  Accordingly, when the detailed dimension is input from the detailed dimension calculation unit 24, the hit figure automatic creation unit 32 starts the program stored in the hit figure automatic creation program storage unit 38 and can predict the hit figure in advance. A corresponding basic figure pattern is read from the figure pattern database 40 as a basic figure pattern, and a figure is automatically created according to a predetermined description procedure.

The hit figure created by the hit figure automatic creating unit 32 reads the bearing performance parameter (dimension xa) in the hit figure image parameter reading unit 42, while the geometric parameter calculating unit 30 When the detailed dimension is input from 24, the geometric calculation formula is read from the geometric calculation formula storage unit 44, and the dimension xk based on the basic image data is calculated according to the formula (1) (note that Z> D2 as a condition) .

xk = D1 − ((W / 2 + R / 2) / sin θ + (R / 2)) (1)
However, xk, θ, W / 2, R / 2, D1, D2, and Z are based on the dimensions shown in FIG. 4A. Here, when Z ≦ D2, the dimensions shown in FIG. Correspondingly, xk is calculated by the following equations (2) to (7).

θ4 = cos ((Y / 2) / (R / 2)) (2)
L1 = tan θ4 × (Y / 2) (3)
θ1 = cos (D2 / D3) (4)
θ3 = θ1−θ2 (5)
L2 = (Y / 2) / tan θ2 (6)
xk = D1-L1-L2 (7)
However, xk, θ1, θ2, θ3, θ4, Y / 2, R / 2, D1, D2, and D3 are based on the dimensions shown in FIG.

  The dimension xk calculated by the geometric formula parameter calculation unit 30 and the dimension xa read by the per-drawing image parameter reading unit 42 are respectively sent to the comparison determination unit 46 to determine the degree of coincidence.

  In the present embodiment, it is determined that the input data is appropriate only when there is a complete match, and otherwise it is determined that the input data is incorrect. Note that the suitability may be determined in consideration of a predetermined error.

  The comparison / determination unit 46 is connected to the determination result image data generation unit 48, and the determination result is superimposed on the format data in a table format set in advance for displaying the determination result.

  In the determination result image data generation unit 48, the determination result information is displayed on the monitor 20 via the display driver 36 by sending the generated determination result image data to the display control unit 34.

  The operation of this embodiment will be described below.

  FIG. 5 is a control flowchart showing a determination procedure for determining the suitability of the basic dimension data input when creating the drawing of the bearing 50.

  In step 100, a data input screen (see FIG. 6A) is displayed on the monitor 20, and the process proceeds to step 102. In step 102, it is determined whether or not data has been input. If the determination is negative, the process proceeds to step 104 to determine whether or not to stop determining whether the basic dimension data is appropriate.

  If a negative determination is made in step 404, the process returns to step 102 and waits for data input. If the determination at step 104 is affirmative, this routine ends.

  If an affirmative determination is made in step 102, that is, data is input, basic dimensions are extracted based on the input data (step 106).

  In the next step 108, design rules are read from the design rule database 26, and then in step 110, detailed dimensions are calculated. In the present embodiment, the design rules for rolling bearings are read from the design rule database 26, and necessary detailed dimensions are calculated.

  In the next step 112, basic image data is generated, and then the process proceeds to step 114, the basic image is displayed on the monitor 20 based on the basic image data, and the process proceeds to step 116.

  In step 116, the geometric calculation formula is read out from the geometric calculation formula storage unit 44, the process proceeds to step 118, and a parameter xk for comparison is calculated using the geometric calculation formula based on the detailed dimensions (formula ( 1) or based on formula (2) to formula (7)).

  In the next step 120, the hit figure automatic creation program is read out from the hit figure automatic creation program storage unit 38 and started. Next, in step 122, the figure pattern is read from the figure pattern database 40 to automatically create a hit figure. At 124, the parameter xa for comparison is extracted from the corresponding figure, and the process proceeds to step 126.

  In step 126, the geometric calculation formula parameter xk and the hit figure image parameter xa are compared. If xk = xa, the process proceeds to step 128, and a signal (OK) indicating that the input basic dimension is appropriate. Signal) is output to the determination result image data generator 48, and the process proceeds to step 132. If xk ≠ xa, the process proceeds to step 130, and a signal (NG signal) indicating that the input basic dimension is inappropriate is output to the determination result image data generation unit 48, and the process proceeds to step 132. To do.

  In step 132, determination result image data is generated based on the input OK / NG signal, and then the process proceeds to step 134 to display the generated determination result image (see FIG. 6B) on the monitor 20. .

  As described above, in the present embodiment, when a basic dimension is input, the relative positional relationship between the pair of members constituting the bearing 50 is calculated geometrically based on the detailed dimension calculated from the basic dimension. The first acquisition procedure obtained by the formula and the second acquisition procedure for automatically creating a hit figure and extracting dimensions from the hit figure, comparing the dimensions (parameters xk, xa) at the same position, If they match, the basic dimensions are appropriate, and if they do not match, it is determined that the basic dimensions are inappropriate. Since the hit figure can be automatically created, the work efficiency can be improved and input errors can be reduced. For this reason, it leads also to the improvement of design quality.

It is the schematic of the CAD system which concerns on this Embodiment. It is the functional block diagram shown about the control in a control part mainly having the function to discriminate | determine the basic function of a CAD system and the state at the time of the assembly | attachment of a bearing. It is a front view which shows a part of bearing. It is a front view which shows the detailed dimension of a bearing, (A) shows when dimension Z> dimension D2, and (B) shows when dimension Z ≦ dimension D2. It is a control flowchart which shows the determination procedure for determining the suitability of the basic dimension data input at the time of bearing drawing creation. (A) is a data input screen displayed on the monitor, and (B) is a determination result screen displayed on the monitor.

Explanation of symbols

10 CAD system (3D model product shape automatic construction system)
12 Input section (data input means)
14 Keyboard (data input means)
16 Mouse (data input means)
18 Control part 20 Monitor 22 Basic dimension extraction part 24 Detailed dimension calculation part (Detailed dimension calculation means)
26 Design rule database 28 Basic image data generation unit 30 Geometric calculation formula parameter calculation unit 32 Per figure automatic creation unit (actual fitting position calculation means)
34 Display control unit (actual fitting image drawing means)
36 display driver 38 per figure automatic creation program storage unit 40 per figure pattern database 42 per figure image parameter reading unit 44 geometric calculation formula storage unit 46 comparison judgment unit (determination means)
48 Judgment Result Image Data Generation Unit 50 Bearing 52 Roller 54 Bearing Body 54A Center Column

Claims (2)

A bearing design system configured to accommodate a roller that rotates in a tapered groove formed in a bearing body, and the bearing body and the roller are fitted to each other.
Basic dimension extraction means for extracting basic dimensions for specifying the shape of the bearing from input data;
Detailed dimension calculating means for calculating a detailed dimension for drawing the bearing based on the basic dimension extracted by the basic dimension extracting means;
Basic image generation means for generating a basic image of the bearing based on the detailed dimensions calculated by the detailed dimension calculation means;
An actual fitting image drawing means for generating an actual fitting image by deforming a graphic pattern of the bearing along the detailed dimension calculated by the detailed dimension calculating means based on a dimensional tolerance between the bearing body and the roller;
Determination of comparing the position of the roller in the basic image with the position of the roller in the actual fitting image, and determining whether the basic dimension extracted from the input data is good or not according to whether or not both positions match Means,
Bearing design system. A graphic pattern database for storing a plurality of graphic patterns of the bearings;
Reading means for reading a graphic pattern from the graphic pattern database based on the inputted basic dimensions;
The bearing design system according to claim 1, wherein the actual fitting image drawing unit generates the actual fitting image based on the graphic pattern read by the reading unit.

Images