SU1049324A1 - Method for controlling accuracy of die pressed sheet parts of vehicle - Google Patents

Abstract

I. METHOD OF CONTROL OF THE ACCURACY OF PARTS FROM THE SHEET BODY OF A BODY OF A VEHICLE, which consists in checking the conformity of parts of the drawing and the subsequent control assembly, characterized in that, in order to improve the quality and reduce labor intensity, the conformity of the Parts to the drawing is carried out by transferring the base lines of coordinate networks to the grid of coordinate networks. on the parts, then the last ones are set to the position of the drawing, combining the like lines of the coordinate grids of the matching parts, and control the position of the opposite lines in Compliant with the drawing, and then checked gaps between the mating pieces and the general curvature of the accompanying drawings. "F CO iNd

Description

2. A control method according to I, characterized in that prior to the control assembly, at the intersections of the coordinate grids previously deposited on the surface-parts of the lines of coordinate nets, in the form of right-angled triangles, the legs of which align with the grid lines and then control assembly by matching the respective legs

triangles on matched parts and scattering of the latter.

3. The control method according to claim 2, characterized in that the holes are made at the intersection of the lines of the coordinate grids of the external parts of the body components; through these holes, the like lines of the coordinate grids of the matching parts are mated; after which the parts fasten together.

one

The invention relates to the transport engineering industry and is intended to control the accuracy of complex volumetric parts, stamped from a sheet, used primarily for the manufacture of passenger car bodies and cabins of trucks, tractors, etc.

Closest to the invention, the technical solution is a method for controlling the accuracy of parts of a vehicle body stamped from a sheet, consisting in checking the conformity of the details to the drawing and the subsequent test assembly 1.

For static control in large automobile factories, bodies and cabs are measured in all respects by body-measuring three-coordinate machines with the issuance of measurement tables.

The disadvantages of this method are the difficulty of assessing the accuracy and greater complexity of preparing the production of parts stamped from a sheet.

The purpose of the invention is to improve the quality of assembly of passenger cars and truck cabs and reduce the labor consumption of pre-production.

To achieve this goal, according to the method of checking the accuracy of the body parts of a vehicle stamped from a sheet, which involves checking the details of the drawing and the subsequent test assembly, checking the conformity of the parts of the drawing is done by transferring the base lines of the grid with the drawing to the part, then the latter are set to drawing, aligning the same lines of the x coordinate grids; selectable parts, and control the position of the opposite lines in accordance with the drawing, after which There are gaps between the matching parts and their overall curvature for matching the drawing.

Before the control assembly, the holes in the form of right triangles, the legs of which align with the grid lines, are made on the intersections of the grid lines that are pre-applied to the surfaces of the grid, and then carry out the control assembly by aligning the corresponding legs of the triangles on the mating parts and fastening last.

5 The holes are made at the intersection of the lines of the coordinate grids of the external parts I of the body components, through these openings the conjugation of the like lines of the coordinate grids of the adjacent parts is carried out, after which the parts are fastened.

FIG. 1 shows the drawing of the lines of the mesh of the grid on the inner panel of the front door of the car; in fig. 2 - drawing the grid lines on the mounting of the inside panel of the front door of the auto5 mobile; in fig. 3 is a section A-A in FIG. 2; on. 4 - drawing the grid lines on the front fender of the car; in fig. 5 is a view B in FIG. four; in fig. 6 - control assembly of the front door of the car; in fig. 7 - section bb In FIG. 6; 0 in FIG. 8 - section GG in FIG. 6; in fig. 9 — node I in FIG. 6; in fig. 10 - control assembly of the car body and checking the total curvature of the wing surfaces and the outer door panel; in fig. 1.1 - 5 section DD in FIG. ten.

Proper drawing of the grid lines on the part is one of the main tasks, since the grid is the base for assembly. The grid application method is chosen 0 individually, however all the details can be divided into three groups.

Details - and groups, when applied to the grid, are mounted on the frame of the control device or on the master model, for example, the inside panel of the front door of the car. Details of the 2nd group, when applying the grid, are installed on the negatives of the master models of matching parts, for example, the installation of the inner door panel

d car. Details of the 3rd group with flanges bent inward, in the drawing room, are set universally - on prisms and jacks, for example, a car wing.

As an example, consider the control assembly of the car body. The base when installing parts in the drawing position with the control assembly are the grid lines applied to the part in accordance with the drawing. The grid lines are traces of coordinate planes, the grid number being equal to its distance from the corresponding zero plane.

The plane passing through the bottom surface of the floor is taken as the zero horizontal plane, and the corresponding grid is called horizontal .;

The Zero zero perpendicular plane is taken as the plane through the axis of the front wheels, and the corresponding grid is called the net from the front wheels.

The zero vertical longitudinal plane takes the plane of symmetry of the body, and the corresponding grid is called the grid from the axis of the body.

For the deposition of the grid lines, the "A pha-66" and "Beta-3" masking are applied.

An example of the first group (Fig. 1). The inner panel 1 of the front door of the car is installed on the frame 2 of the control device, fixed in shape and secured with clamps 3 (conventionally, one.). The frame 2 together with the part fixed on it is exposed on the plate of the coordinate marking machine "Beta-3jC on the coordinate grids {which are on the plates 4 of the frame 2 so that they are parallel to the axis of the machine), With the help of a hinged scriber 5 of the coordinate-marking machine The "Beta-3 grid lines from the plates 4, frame 2, are transferred to the part in increments of 25, 50, 100, or 200 mm, depending on the design of the part, its dimensions, and the interfaces with other parts. FIG. I shows the grid lines 400 and 1000 applied to the outer surface of the part.

An example of the second group (Fig. 2). The negative 6 of the master model of the outer panel of the door is installed on the plate of the coordinate marking machine so that the grid lines on the plates 4 of the negative 6 are parallel to the machine axis, and are fixed. A set-up 7 is set up with a mating surface on the master model guideline 6 approximately in the matching zone and fixed with the Ac plane by means of a magnetic prism 8 and a metal rectangular cassette 9. With the help of the coordinates of a black-marking mask “Beta-SCH. The horizontal coordinate lines 200 and 500, taken from the 4 negatives 6 plates of the mastermodel of the outer door panel, are transferred to the plane B of the set-up 7. To perform further operations, the values of a, b, and c are calculated from the drawing. With the help of the coordinate marking machine, the prefix 7 on the plane A is exposed so that the quince sizes correspond to the calculated ones. The correct position of the attachment 7 relative to the horizontal grid of the car is determined by clear lines, which are decorative protrusions and pads running through the entire body of the car. With the help of the coordinate beacon, the Beta-3a installs a drop (size c) between the lines of the horizontal grid along the plane of the preamble 7, i.e. the part is set in the drawing position relative to the body axis along the inclination of the plane B. After the attachment 7 is set in size and clear lines, the plotted lines of the horizontal grid of the vehicle are re-checked. In the case of the displacement of these grids Q, the above operations are repeated. The grid lines of all three axes of the car from the negative to the master model are transferred to the outer surface of the finally exposed part.

An example of the third group (Fig. 4). The front wing 10 is installed on the U plate of the coordinate marking system cBeta-3 “. on the magnetic prism 8 and three jacks 12. The reference point is the height of the magnetic prism 8, the other three points for installing the wing 10 are height-adjusted by the jacks 12 to the drawing position in a plane parallel to the body axis. After installing the wing 10 in the drawing position, it is fixed with magnetic prisms, tacks, and squares (not shown). For drawing the lines of the horizontal grid and the grid from the axis of the front wheels of the car, elements of the part are taken as the base. FIG. 4 shows the O and 400 grids applied to the outer surface of the part. 0

After applying the coordinate,:, and grid lines to all parts, proceed to the control assembly of the assembly in a metalworking manner. On the mating surfaces of parts, the same lines of the coordinate grid (lines having the same number) are precisely aligned, and the parts are fastened together. If the grid lines of the same name are not possible: to combine visually (one detail completely overlaps another, the grid lines of the grid are applied to non-matching surface parts, etc.), such as on the outer surfaces of the outer 13 and inner 1 panels of the car doors , at the intersections of the same coordinate grid of all the parts, there are 5; holes 14 in the form of rectangular triangles of COLLARS, the legs of which coincide with the grid lines, and the corresponding legs of the corresponding parts coincide. (Fig. 7), while the number of holes must be at least two. For assembling the mating parts on one of them the grid lines are plotted on the mating surface, and on the other - on the non-mating surface, i.e. when between surfaces with marked grid lines there is one thickness of metal, for example, on the outer surfaces of the outer panel 13 of the door and the set 7 of the inner panel of the door at the intersection of the lines of the coordinate grid. If in this way collect several parts, then on. the outer part is drilled larger than the inside. The number of holes must be at least two. After aligning the corresponding lines of the coordinate grid of the mating parts, the latter are fixed with clamps or clamps, then holes are drilled into them through which the parts are fastened with self-tapping screws. All elements of the parts that prevent the matching of the corresponding lines of the grid are eliminated by a metalworking method (trimmed, cut off), since these elements are defects that make up the high-quality assembly of the assembly in the assembly area and therefore must be eliminated. If in the control assembly between parts there are unacceptable (non-collar) clearances, protrusion or sticking of parts one relative to another, then they are also defects that are yet to be noted before parts are supplied to the assembly site. For example, contact between the outer panel 13 of the door and the adapter 7 of the inner panel of the door according to the elements forming the depth of the core door (Fig. 8) is not allowed. The gap between the flange line of the inner door panel 1 and the flexible line of the outer door panel 13 must clearly correspond to the drawing (Fig. 5). The gap between the front wing 10 and the outer, front door panel 13 should also closely match the drawing, and the wing and door surfaces should be a single surface, i.e. defects of the type shown in FIG. 1 not allowed. The highest economic effect of the proposed quality control method is at the preproduction stage. It allows you to detect errors in product drawings, in models, in chip and control equipment, in stamping and control technology, to eliminate detected defects in parts and assemblies even before the product is assembled in the assembly area, which makes it possible to correct the stamp and control osastaski and thereby reduce or even prevent manual revision of parts before assembly. Without a check assembly of the product, many defects would be determined only. with the beginning of the assembly and on the assembly area and, therefore, the work on the analysis of defects and the adjustment of die and control equipment would begin later. Measuring the dimensions of each part separately without performing a control assembly would not allow detecting a number of assembly defects, which is explained by the feature of parts pressed from the sheet. For example, such parts may differ in large dimensions, great complexity of the form and low rigidity, as a result of which the parts may change their size and shape depending on their position in space and when assembled with other parts, on the parts pressed from the sheet due to complex shape and low rigidity cannot achieve the required accuracy of their geometrical parameters, and when assembled into a knot, the place of each part is strictly defined and its geometrical deviations affect assembly with adjacent parts. The proposed method allows to ensure the quality, reliability, durability of the product and its appearance from the very first samples, as well as to use the control assembly components for setting up the assembly tooling. The overall economic effect of controlling the accuracy of parts stamped from a sheet by carrying out a control body assembly of a VAZ-2105 during preparation for production will be about 100,000 rubles.

Flatness A

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FIG. 9

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FIG. eleven

Claims (3)

1. METHOD OF CONTROL OF ACCURACY OF STAMPED FROM BODY DETAILS OF THE BODY 'VEHICLE, which consists in checking the conformity of parts to the drawing and subsequent control assembly, characterized in that, in order to improve quality and reduce labor intensity, the conformity of parts to the drawing is checked by transferring the base lines of coordinate grids from the drawings to the parts, then the latter are installed to the position of the drawing, combining the same lines of the coordinate grids of the mating parts, and control the position of the opposite lines in accordance with the drawing, and then check ry between mating parts and their overall curvature to the accompanying drawings. ζ © СОЬЭ I 2. The control method for c. I, characterized in that before the control assembly, holes are made in the form of rectangular triangles at the intersections of the coordinates of the coordinate lines of the · ·· grids pre-drawn on the surface of the components of the grid, the legs of which are aligned with the grid lines, and then the control assembly is performed by combining the corresponding legs of the triangles on the mating details and fastenings of the latter. 3. The control method according to p. 2, characterized in that the holes are made at the intersection of the coordinate grid lines of the external parts of the body parts, through these holes, the same name lines of the coordinate grids of the mating parts are mated; then fasten the parts.