JPH03181607A - Manufacture of rod and the like - Google Patents

Abstract

PURPOSE:To facilitate forming and obtain a product of light weight and little dispersion of weight by punching flange parts together with a rib part on a prescribed position of raw material of H-section forming flanges on both ends of a rib. CONSTITUTION:Steel raw material 1 of H-section forming wide flanges 1b on both sides of a thick rib 1a of low height is set on a trimming die, and a large diameter hole 2 and a small diameter hole 3 are formed by punching the flange parts 1b on both sides containing the rib 1a at a prescribed position. Hereby, manufacturing cost is reduced and a product of light weight and little dispersion of weight can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of manufacturing rods such as connecting rods for engines.

(Prior Art) Conventionally, connecting rods for engines have been mainly formed by forging steel materials.

As shown in FIG. 8(A), the conventional connecting rod 21 consists of a loft section that connects a small diameter section 22 where the piston is attached and a large diameter section 23 where the crank pin is attached. The portion 23 is attached to the crank pin using a cap 24 with a thickness of M1m.

The rod portion of this conventional connecting rod 21 is the eighth
As shown in Figure (B), the rib 21a has a narrow flange 21b on both sides, forming a single-shaped cross section.

In Japanese Patent Application Laid-Open No. 63-199916, a small diameter part to which a rod part and a piston are attached, and a large diameter part to which a crank pin is attached are separately molded.

A composite connecting rod that connects these by forging has been proposed.

In addition, in recent years, products cast using the lost wax method and FRM9fl connecting rods have appeared for the purpose of reducing weight and reducing variation in the amount of beads.

(The problem that the invention aims to solve WfJ) Conventional steel connecting rods are molded with #, so it is necessary to create a slope in the mold, so there is meat in unnecessary places, making it possible to reduce weight. Also, the variation in weight due to the variation in product size becomes large, and 3H due to machining
J is required. Further, the shape of the mouth/throat portion is limited to the above-mentioned single-shaped cross section, and it is not possible to reduce the weight by using other shapes.

What is described in the above-mentioned publication makes it possible to make the small diameter part where the rod part and the piston are attached, and the large diameter part where the crankshaft is attached, with different materials. Due to the structural bonding, the f-number is multiplied by the manufacturing process.

Cast products made by the lost wax method and connecting rods made from FRM cannot be used for @products because the costs are extremely high.

It is an object of the present invention to solve the above-mentioned conventional problems and to provide a manufacturing method that allows steel connecting rods and the like to be easily formed and has a small variation in mold size.

(! Step and operation for solving the problem) The present invention has a cross section H in which a wide flange is formed on the inside of a short rib.
This is a method of manufacturing rods, in which a character-shaped material is molded, and a predetermined portion of the material, including the flange portion and rib portion, is punched.

By making the cross-sectional shape of the mouth and end H-shaped.

It is easier to punch out the flange part including the rib part,
In addition, the weight of the product can be reduced for the same strength, and the variation in weight can be reduced.

(Example) Embodiments of the present invention will be described with reference to the drawings.

Fig. 2 shows the steel material l of the connecting rod. This steel material l is a long material with an H-shaped cross section, with wide flanges lb and lb formed on both sides of a thick rib la with a low IV, and is manufactured by rolling, extrusion, rolling, continuous casting, etc. Manufacture. This H-shaped steel material 1 is forged using an L lower metal Jfill, 12, which approximates the H shape shown in Fig. 4, thereby reducing the accuracy of the forming and producing a forging effect. strength can be increased.

This H-shaped cross-sectional steel material l is punched out as shown in FIG. !
! 13, punch out the flanges lb on both sides including the rib la with the punch 14, and make a small diameter hole 3 to attach the piston.
A large diameter hole 2 is formed to be attached to the crank bin. The rod portion 4 between the large-diameter hole 2 and the small-diameter hole 3 is formed by punching flanges 1b on both sides into a predetermined shape, leaving the rift la, to form a connecting rod as shown in FIG.

The cross-sectional shape of the connecting rod has been changed from the conventional 0-shape to an H.
The shape makes it easier to punch out the flange portion including the rib portion, which reduces the weight of the product for the same strength and reduces the variation in weight.

This connecting port does not have a large diameter part to be attached to the crankbin or a type that fastens the split cap, so I am wondering if it is necessary to make the crankshaft M type or not. By doing so, the conventional split cap can be tightened and fixed.

As shown in FIG. 6, the large diameter hole 2 of the connecting rod processed into the state shown in FIG.

The composite material 5 is forged and joined between the flanges lb by lowering the 516, and the material 5 is similarly forged and joined for the small diameter hole 3 to form the product shown in FIG. The crank pin for this product can be manufactured by applying normal processing to the large diameter part to tighten the cap, and by fixing the conventional split cap.

To join the composite material N5, it is also possible to plug the large diameter hole 2 of the connecting rod processed into the state of the first U54, set 9 and mold the composite material 5 by casting. Since it can be made of a different material from the rod part, it is possible to select the right material for the right place.

Another method for manufacturing this type of connecting rod is shown in FIG. The lower mold 18 is installed on the punching table 17 via the spring 19, and flanges lb, lb are formed at predetermined portions of the H-shaped steel material l.
The composite material 5 is inserted between them, the upper die 20 is lowered, and the large diameter hole 2 is punched out at the same time as the lower J! ! The flange lb and the composite material 5 are pressed together by the pressure of the springs 19 of 18 and are forged together. Therefore, punching and forming of the composite material can be performed in the first step.

In the above embodiments, a method for manufacturing a connecting rod has been described, but the present invention can also be applied to a method for manufacturing arms and rods such as a drop arm of an automobile steering component and a torque loft of a chassis component.

(Effect of ffill) In the present invention, by making the cross-sectional shape of the loft type H-shaped, the flange part including the rib part can be punched and formed, which significantly reduces the manufacturing cost. In addition, the amount of product π for the same strength can be reduced, and the variation in heavy rings can also be reduced.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a connecting rod produced by the manufacturing method of the present invention, Fig. 2 is a perspective view of the raw material, Fig. 3 is a perspective view of another connecting rod, Fig. 4 is a cross-sectional view of the forging process, and Fig. 5 is a perspective view of the connecting rod. Figure 6 is a cross-sectional view of the punching process, Figure 6 is a cross-sectional view of the forging joint, and Figure 7 is a cross-sectional view of the punching process.
The figure is a cross-sectional view of a punched and forged joint, Figure 8 (A) is a front view of a conventional connecting rod, and Figure 8 (B) is a cross-sectional view of a conventional connecting rod.
) is an enlarged sectional view taken along line XX of FIG. 1: H-shaped material la: rib lb: flange 2: large diameter hole 3: small diameter hole 4: rod part 5: composite material 1

Claims (1)

[Claims] A method for manufacturing rods, characterized by forming a material having an H-shaped cross section with wide flanges formed on both sides of a short rib, and punching a predetermined portion of the material including the flange portion and the rib portion. .