RU2326777C2 - Method of windshield wiper control rod manufacture and its design - Google Patents

Abstract

FIELD: technological surfaces.

SUBSTANCE: method includes perforation of opening on flat peripheral section of control rod and extrusion of circular groove around the opening. On the opposite side the metal is extruded in the gap. The gap is created by internal wall of matrix and puncheon cylindrical part. The produced circular bulge is directly adjacent to the opening. The control rod that is manufactured by this method consists of central part and two flat peripheral sections with openings.

EFFECT: reduction of technological operations quantity; simplification of rigging structure and creation of control rod with sufficient strength in transverse section on flat peripheral sections.

2 cl, 7 dwg, 1 ex

Description

The present invention relates to the automotive industry and can be used for the manufacture of rod wiper stampings.

A known method of manufacturing a wiper rod [1], which consists in flanging a punched hole in the peripheral section of the rod to prevent rotation of the plastic sleeve. However, it is impossible to flange the hole with a jumper width between the punched hole and the outer diameter of the flat peripheral part of the thrust equal to 3-3.5 mm and a thickness of 2-2.5 mm.

Closest to the proposed invention is a method of manufacturing a wiper rod [2], which includes the introduction of punches from two sides around a punched hole in the flat part of the rod and the formation of annular grooves. With this method of manufacturing annular intermittent grooves, the number of technological operations increases, because it is necessary to remove the extruded metal on both sides. In addition, when extruding grooves from two sides, the design of the stamp is complicated.

The objective of the invention is to provide a method of manufacturing a wiper rod, reducing the number of technological operations and simplifying the design of equipment for the manufacture of thrust.

The specified technical result is achieved due to the fact that in the known method of manufacturing a wiper rod, including punching a hole in a flat peripheral section of the rod, extruding an annular groove around the hole, while extruding an annular groove on the opposite side, the metal is extruded into the gap formed by the inner wall of the matrix and the cylindrical part of the punch, forming an annular protrusion adjacent directly to the hole.

With this method of manufacturing traction, the number of technological operations is reduced, since the annular groove around the punched hole and the annular protrusion adjacent directly to the hole are made simultaneously in a single stroke of the press slider on a stamp of simple construction, and there is no operation to remove extruded metal.

Known thrust of the wiper 1 (Fig. 1, pos. 18, Fig. 7 pos. 18), consisting of a central section and two flat peripheral sections having punched and flanged holes. The holes are flanged to prevent the plastic sleeve from turning. However, it is impossible to flange the hole with a jumper width between the punched hole and the outer diameter of the flat peripheral part of the thrust equal to 3-3.5 mm and the thickness of the flat peripheral part equal to 2 - 2.5 mm.

Closest to the proposed invention is the design of the rod 2, consisting of two flat peripheral sections having punched holes. To exclude the rotation of the plastic sleeve, the holes are flanged (see Fig. 7) or annular grooves are extruded around the holes on both sides (see Figs. 5 and 6).

The disadvantage of this design is the reduced strength in the cross section through the hole, since the thickness of the flat part of the rod decreases due to extrusion of the annular grooves on both sides.

The present invention solves the problem of creating a design for the wiper thrust, providing a reduction in technological operations during its manufacture and sufficient thrust strength in cross section on flat peripheral sections.

To achieve the technical result, a draft design is proposed consisting of a central section and two flat peripheral sections with holes and an annular groove made around the hole, and an annular protrusion adjacent to the hole is made on the opposite side relative to the annular groove.

With this design of the traction, a reduction in the number of technological operations and sufficient strength of the flat peripheral portion of the traction are provided, since the annular protrusion adjacent directly to the hole increases the thickness of the flat part of the traction in the cross section through the hole.

The invention is illustrated by drawings, which depict:

figure 1 - diagram of the manufacture of an annular groove and an annular protrusion in the peripheral section;

figure 2 is a General view of the traction and the cross section of the plastic-filled cap;

figure 3 is a flat peripheral section of the thrust with a cross section through the hole.

A method of manufacturing a wiper rod is carried out in the following process sequence (see figure 1).

The wiper rod preform having a flat peripheral section 1 is installed in the latch 2, mounted on the matrix 3. When the press slide moves down, clamp 4 presses the flat peripheral section 1 to the matrix 3, and the punch 5 enters the punched hole 7 with its cylindrical part 6. the further course of the punch 5 it is pressed with its annular protrusion 8 into the flat part of the rod 1, forming an annular groove in it 9. The metal formed from the indentation of the annular protrusion 8 of the punch 5 is extruded into the gap formed by the cylindrical 6 overhnotyu punch 5 and the inner surface 10 of the matrix 5, forming on the flat part 1 an annular projection rods 11.

The proposed design of the thrust includes (see figure 2 and 3) the Central section 1 and two peripheral flat sections 2 having an opening 3, filled with plastic 4, forming a sleeve with internal spherical holes. Around the punched hole 3, an annular groove 5 is made, and on the other hand, an annular protrusion 6 adjacent to the hole 3.

EXAMPLE

Consider the manufacturing method and geometric parameters as an example of traction made from a tubular workpiece.

The tubular billet has the following parameters: outer diameter -14 mm, wall thickness S = 12 mm (see Fig. 2, section A-A). The rod has a central section equal to the outer diameter of the pipe, and two flat peripheral sections 2S = 2.4 mm thick (two pipe wall thicknesses). The diameter of the flat peripheral section d = 26 mm, and the diameter of the punched hole in the flat part of the rod d ₁ = 20 mm.

After manufacturing according to the proposed method, the annular groove and the annular protrusion have the following dimensions: the width of the annular groove is (d ₃ -d ₂ ) / 2 = (23-21) / 2 = 1 mm, the jumper between the hole and the inner diameter of the annular groove is (d ₂ -d ₁ ) / 2 = (21-0) / 2 = 0.5 mm. The depth of the annular groove is h = 0.8 mm. The annular protrusion has the following dimensions - the outer diameter d ₄ = 21.6 mm, the width of the protrusion is (d ₄ -d ₁ ) = (21.6 -20.0) / 2 = 0.8 mm, the transition radius of the outer diameter of the protrusion is flat parts of the rod R = 0.1 mm, the height of the protrusion h ₁ = 1 mm

Thus, the proposed invention allows for the manufacture of traction to use a minimum number of technological operations and to increase the strength of the peripheral section of the traction in the transverse direction.

Information sources

1. German patent N 3222308 A1, figure 1, pos. 18, Fig. 7, pos. 18.

2. U.S. Patent No. 3,704,903.

Claims (2)

1. A method of manufacturing a wiper rod, including punching a hole in a flat peripheral portion of the rod, extruding an annular groove around the hole, characterized in that when extruding an annular groove on the opposite side, the metal is extruded into the gap formed by the inner wall of the matrix and the cylindrical part of the punch, forming an annular protrusion adjacent directly to the hole. 2. The wiper rod made by the method according to claim 1, consisting of a central section and two flat peripheral sections with holes and an annular groove made around the hole, characterized in that an annular protrusion adjacent to the hole is made on the opposite side relative to the annular groove.

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