JPS5982139A - Production of forged connecting rod - Google Patents

Abstract

PURPOSE:To increase the yield of material and to improve productivity by forming a blank material by cross roll forging to an intermediate forging, subjecting the same to rough finishing by TR forging and forming the rough finished material by closed forging into a finish shape. CONSTITUTION:A blank material M cut to a prescribed length is heated to a prescribed forging temp. in a heating furnace and is formed to a roll-shaped intermediate forgming M1 while the volume is precisely distributed by cross roll forging; at the same time, excess end materials m1, m1 are cut off from the main body M1. Said material is subjected to the rough finish forming wherein the larger ends are subjected to upsetting and U-shaping working simultaneously by TR forging. Such material is finish formed of detailed parts by closed forging in the final stage, whereby a forged connecting rod C is obtd. The deburring stage is thus eliminated and the yield of material is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention provides a crank mI! for various power machines including automobile engines. This relates to a method for manufacturing forged products before mechanical cutting in the manufacturing process of connecting rods incorporated in 11, and its purpose is to create a special forging product that combines various forging methods with different forming methods. The object of the present invention is to establish a new method for manufacturing connecting rods that can significantly improve material yield.

Conventionally, in order to make this type of forged product by M, a bar-shaped material CM+ cut to a predetermined length is stretched using a drop hammer (draw) and a combination of rolling (roll) processes, as shown in Fig. 1 (U), or After forming into an intermediate forged product as shown in Figure 1 (b) by a combination of a rounding process using a press or a rolling process using a forging roll, this is then rolled into a rough area (2 mm) using a forging press.
Perform the finishing (single punching) and finishing (single punching) stamping to form the shape as shown in Figure 1 (C), and finally use a trimming press etc. to form the shape. J(m+ is often excised to obtain one to several products (cl) as shown in FIG. 1(d).

However, using this method, 11 hun rod forged products were made.
1I! In addition to the normal scale H1 loss and cutting loss, gripping allowance and sprue loss must be taken into account when taking the material; jS! 1. Forged 41 with a rough shape like a connecting rod
A large flash of at least 25-30% for products! ! (Since it is necessary to take into account losses, the material yield between raw materials and products is extremely poor at approximately 55-60%. This is the most important factor in promoting productivity improvement of connecting rod steel 1 precious products. It was a dot.

The method of the present invention was developed to solve the above-mentioned problem, and its implementation will be specifically explained below.

Figure 21 (a) (mouth 1 (7) (ni) (force) shows the gll 74 process of Hunrod flower A1 product according to the present invention, such as nickel-chromium mill, nickel-1 chromium knuckle molybdenum steel A material (river) is a material (a material) that is cut into a predetermined length as shown in Figure 2 (a) so that the weight of the material is p[, taking into account various losses.
M) is heated to a predetermined degree of wetness using a high-frequency induction heating furnace or a high-speed gas heating furnace, and then cross-roll forging is used to precisely distribute the volume.
<Mold into a roll-shaped intermediate product (λ), and at the same time cut off the excess ends 14 (m:I) (m, l) from the main body (Mυ).

After completing the forming of the intermediate Ha product (river) as described in nIJ, the larger end (y++2+) is rounded and rounded as shown in Fig. After performing rough finish forming, which includes 0-shaped machining at the same time as shown in Figure 2 (D), in the final process, detailed finish forming is performed by closed forging (possible with die forging using the floating die method). A connecting rod forged product fC1 as shown in FIG. 2 (E) is obtained.

As mentioned above, in the method of the present invention, when manufacturing a connecting rod forged product, three types of forging methods are used, each having a completely improved forming means, namely, cross roll forging, T R61 and 0,
Unlike conventional methods, the material is distributed extremely precisely in the cross-roll forging process, as each method of closed forging is skillfully utilized to form the product using a unique method. In the process, burr machining and zero-shaped machining are performed at the same time, and in both the TT'l forging and closed forging processes, there is no overhang of the burr, so the burr removal process is not necessary, and a sprue is installed on rice H. There is no need for this, only a small amount of smoked wood is produced during cross-roll forging throughout the entire process, and no other material is wasted, making it possible to improve the material yield between raw materials and products to approximately 85-90%. become.

Therefore, if the method of the present invention is applied to the product size of connecting rod forged products, the problems that have been pending for many years will be solved at once, the material yield will be greatly increased, and the productivity of connecting rod forged products will be dramatically improved. It is possible to stop improving.

[Brief explanation of drawings]

Figures 1 (a), (b), ) (d) are front views showing the manufacturing process of Fun H + Tsudo forged products by the conventional method, and Figure 2 (1)
A) (B) (C) (D) 1) is a perspective view showing the manufacturing process of a connecting rod forged product according to the method of the present invention. (C)...Connecting rod forged product, 1LIl)...Main o;t
, 1. , J... Paris, ◇1.0... intermediate pl+) manufactured product, (ynl,)... smoked wood, (river →... end' (t:
, uI! A ka ITI Yui^1.1mi1 enemy, j 7 ・,゛1

Claims (1)

[Claims] The material is cut to a predetermined length and then formed into a roll-shaped intermediate forging using cross-roll forging while accurately distributing the volume.Then, the material is roughly finished by simultaneously applying roughening and zero-shape processing to the edges using TR forging. A method for producing a forged Hunrod product, which is then formed into the final finished shape by closed forging.