JPS60102246A - Manufacture of connecting rod for internal-combustion engine - Google Patents

Abstract

PURPOSE:To reduce the weight of a connecting rod by forming a double-headed material having spherical both ends from a barlike stock and making closed forging by a die having relief part for excessive stock corresponding to variance of stock volume. CONSTITUTION:A preform 10c that connects large diameter and small diameter shaft parts by an intermediate shaft part is formed from the barlike stock 1. A punch 53 and mandrels 51, 52 are lowered by the action of a ram against the preform 10c set in the engraving part 64 of a lower die 60, and at the same time, an upper die 50 suspended by a punch 53 is also lowered. A forming space is formed by engraving parts 54, 64 of the upper die 50 and lower die 60. At the same time, springs 57, 58 are compressed, and the punch 53 and mandrels 51, 52 are projected in the engraving part 54 to form desired rod form. As relief part of excessive material is provided between both ends of the rod and engraving part of the upper die and variance of the preform is absorbed by large and small end parts, generation of forging burrs is prevented. The weight of the rod can be reduced by this method.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to forging and forming connecting V'' throats for internal combustion engines. This relates to making the connecting rod lighter.

When connecting an internal combustion engine, a large inertial force acts due to the mass of the piston, piston pin, and connecting rod themselves.Reducing these inertial masses improves engine responsiveness, output, and fuel efficiency. Contribute greatly.

However, in conventional forged steel- or aluminum-based connecting rods, relatively large chiseling marks 6 remain at the cracked parts of the 119 mold, as shown in Figure 1, resulting in a large shape factor and fatigue. Since there is a problem that the life of the culm part 1 is not constant due to the acceleration of the cracking and the increase in fatigue strength, it is necessary to sacrifice the inertial mass of the connecting rod and prevent wave breakage due to fatigue. [1] The overall thickness is increased to increase strength.

Therefore, the purpose of the present invention is to control the occurrence of forging paris in order to reduce the weight of connecting rods for internal combustion engines.
It is an object of the present invention to provide a manufacturing method that improves the notalflow connection state and shape factor, stabilizes fatigue strength, and makes it possible to reduce all rows of thickness.

The present invention will be described below with reference to drawings of embodiments.

Figures 2 to 1 show the forming process of connecting ``1) I'' (represented by the shape A, Figure 2 shows the rod-shaped material 10, and Figure 3 shows the rod-shaped element]) 10 with the desired uneven thickness (1-'j) of the intermediate shaft part (: 3 balls at both ends, head 11G at l, ]2+7).
+ 2 and Fig. 1 ``head filler 4'' 10 (°) are formed in a closed forging mold, thereby forming a small hole 27 at one end that should not fit with the piston. The other end of the small end 12d1 is formed with a large end hole 26 that does not fit with the crank/yant, and the front part 13d and 41E connects between the two. Breaking line 23
2:) Connecting rod 10 (1 shown) with no protruding burrs.

Connectino II Soto 1o (1
The culm 13dlJ, the fifth section representing its v-■ cross section.
As is clear from the figure, there are ribs 1 on both sides of the
6 and 17 are formed in the 11-shaped cut 11. 1 dako's connecting O throat l (1Ll l;
shi, the small end +2d and the large end 11 (1) have a pair of small diameter 4 parts 25 and a pair of large diameter 4 parts 24 facing each other in the axial direction of the ends 4'', those 4 parts 2.1° 25 is later subjected to appropriate cutting and communicated with the aforementioned small end hole 27.
And finish the wide end hole 2G.

Finally, the formation of the above-mentioned double-headed moon 10e and Kofuridink [Kotsuto] Od will be explained using Figs. 6 to 11.

1. As shown in Fig. 6, a rod-shaped moon 10 with a predetermined diameter and a predetermined length is prepared according to a predetermined element. Experimental results from 41f have shown that it is desirable for the volume variation to be within ±1.q for the completed mold geariness, and this quality is determined by the material volume, which will be described later, in the forging die. It may not necessarily be within this range, but may be based on test results when providing a release section for excess element H due to variations in .

The prepared rod 1 (,) is inserted into the die-cutting hole 31 of the mold 30 as shown in FIG. Large diameter shaft part at the other end] 1 il and a tapered shaft 11 between them
- What ii ■ 1b part 13 jl to n] plan 1 no 11 J1
Shape and suck the 7th rod-shaped element t O+1 with uneven flesh.

Subsequently, by this molding, the ('H4) bar UI (+
1. i-.

Figure 8 shows the combined division IX.
! !・10.・11 die-cut holes ・1Φ person in I2 moving forward and backward facing each other ・Ll 3.・At 11, [4 horns 4 to I, 1 part on both sides (・This J icy head 11 (+1 1, r2
' or) Form a 1-ni-made 扛/this double-headed H pay A10 +-. This double υ11 state 44) Defeating from the A' −I Q C pattern &j, divide +0,4] sweat;! 1
:11 Bizetete.

↓...The 4"3" on the molding in Figure 8 is the rear"', and the culm is 1.
・The stability of Harumoto 14 is 1 and the L direction]-, so Figure 9 does not show μm1 and the spherical head is 1] Half + li to OC1120c
t for i] I, 1 [2, 121, 122 as the spherical head and 11! j forms ItoL, -C double-headed element IJ' J Oe
It is possible to form a . Jr-, J: o:l
/This, forming 1 culm of bicephalic cumulus io+- (・-11-recording (not limited to 1, Fig. 7 and 0'j:P; Fig. 8 into one soil 4", ゛It may be done by consolidating, rolling or rolling.

However, regardless of the method of forming the double-headed 10 (X), the uneven thickness can be set by
”, i Figure 10, forming into a connecting rod, t'
A's 11 Volume of each part of the molded gabiday of closed sheet molding shown in Figure 11 and spherical head 11 (shi, 12 (- and middle: ll
It is determined that the volume of the til part 1:3 (゛) is almost equal. In other words, the connection
Small end 7xB 12 Ll, J) 1'l:, 1 part 14
tl tar-,, small iff (DI:+Jc state ■"
Part 12 (,] <fT', ノJ11-shaped head] 1 f
Is it the volume of
t+nitaba+IQt+ intermediate ll1ll1 part 1:
Adjust the uneven thickness to accommodate the 3” volume)
I'm IL.

Yano's flesh is unevenly grown η4 like this/Komey head down element (
”10 (’ is Connect Ink [J Soto shape 11g-
As shown in FIG. 10, it is supplied to a predetermined position in the die engraving part 64 of the first die of a closed forging die.

Due to the operation of the not-illustrated pressure plate 59
At the same time, the punch 53 and the retama/trel 51+52 attached and fixed to the punch are F lowered 7, and the tension bolt 55
．． The upper mold 50 suspended from the punch by 56 is also lowered together. This punch 53 and 0, the upper die 50 is the lower die 60
It is inserted into the kite post 65 which is fixed to the body (with one arm inserted, it can move forward and backward without any deviation from the mold engraving parts 6 and 1 of the lower mold 60 - J function).

When the punch 53 and the 1-type die 50 are further lowered, the ``-die 50 and the lower die (50) are in close contact with each other and the die part 5.1
, 64 to form a closed molding space, and the springs 57 and 58 are compressed to form a closed molding space.
(The tips of punch J4 and O. Manotrel 51+52 protrude into the die-scaved part 5ll of l.

As a result, the double-headed moon 10 (, 11) is hermetically sealed and molded into a desired shape of a connecting groove, as shown in FIG. 11.

As shown in Fig. 11, the mold sealing is completed and the punch is also J.
4... is at the position where it has reached the first dead center outside Ji, and in this closed forging station, there is a small end J2 (1 and large ψ111
1 part 11 (l and -1-, opposite ends lI+1 in the manotrel 5152 axis 7 gland direction of the die carved part 571) fil
There! (1! The carved portion 571 is provided in an annular shape by extending seven times in the direction of the mandrel axis.

In addition, even when providing relief portions for the surplus element at locations other than the above two locations, the axial direction of the small end hole 27 and large end hole 2o formed in the small end portion 12 (1 and large 1111, ; portion 11 ([ Koi Kudeinkurosoto die carving part edge 1 river (((It is good to form it by die carving.

This kind of Yoichi Tsukigi ('s escape F?B67, 68
By providing /・2, the additional element ('' due to the variation in the cumulative monthly volume is small end 12 (1 and 0, human end 11 (1
There, □'s: 1 (11k ノ; direction・'') becomes a slight variation in the process and is absorbed, and the same 11. effect' (the forging stress acting on the closed die is μl 1'', so the mold breakage 1ji It is difficult for this to occur, and a stable mold life61) can be obtained.

Tonohana/Jot molded connecting rod from closed mold
To take out J, the upper mold 5o and punch 53 are raised in the same manner as shown in FIG. 10, and the knockout bar 60 is raised 2. Connecting rod formed in this way 1. Od 1 Figure 4, ff15 Figure J
- As shown, there is almost no occurrence of cracks on the molded line 23,
No deburring process is required.

After this, the Od is completed with the specified processing.

In addition, if you want an even lighter HY ratio, the wedge part 13 (1 of It is also possible to form holes 2..1.25 as shown in Figure 1.1.

That J'J'l friend' -1 ('+: Nitai - C section middle shi (
2iril: 'Shout 1゛rudo; 1zuM';1" small j-IJu <= r i cutei [" throat I C1d 1
・Type 8 (1, ]-, p + - installation 2 I and -l:
' , +1. Small diameter protrusion 8 of IJ/tortor 81 (j, large f゛L person/[reduced recess 2 in 87]), diameter entry recess R1's
2 □i (c , a combination r
70 and Punch 72.73 1. descend (...2", Lido)
li'780 blade 82.83 and Beaudev 2+73 and C (
- 1st; As shown in Fig. 3, wedge part 1 'J' has a hole 2
#I, 25 strokes] Form without J.

As described above, the present invention can prevent the occurrence of forged burrs, thereby improving the shape factor and metal bonding state of forged connecting rods, as well as improving fatigue strength. It is possible to achieve a match between 0 entry and strength,
As a result, the size of the shape factor due to the punching marks and the thickness of the mold j, which was provided to compensate for the failure of metal slag, were reduced.1. "do.

[Brief explanation of drawings]

Figure 1 shows the conventional manufacturing method of rJi shape 7).
Self-phase explanatory diagram. Figure 2 No. 11, Book 51-
The first and eleventh day of the Ming Dynasty was revealed.
Overmolding of 1 node, 1↓, ゛゛ element 4A-+It shape representation, clear diagram,, q'' 5 Figure 1-31-V-V of Figure 1
Abe's cross-sectional explanation 1 [. Figures 6 to 1
Figure 1 is an explanatory diagram of the manufacturing process corresponding to Figure 2 and Figure 1. Figure 12 and all Figures 1 and 1 show the process of forming a hole in the wedge part of the connector ftsuk [j so I in Figure 4 and the explanation of the hole part 1. ! This is a Jj diagram. (Explanation of symbols) 10...-rod-shaped element 4A,) l Oe-bi-headed element A. 1 (l tl・ Connecting glosso l"o ] l
c, J2L-・spherical bright area. 11 (1 large 1/i!j part. 12 (1 to small ,,;
i, i part. 1:3d・-culm. 50-...L type. 5;3 Bonci. 60・F type. 571 type engraving part. 67.68 Relief part. 26 Big end hole. 27-・Small: 11"A; Hole. 2:3 Missing trace of mold cracking. Patent applicant Takekisaya et al. Industrial Co., Ltd. (and 1 other person) '-"" 44θ No.] IF? (! Zaq No. '12 Figure

Claims (1)

[Claims] A small end portion 12 (1) having a small end hole 27 that does not fit with a piston pin at one end, and a large end portion 12 (1) having a large end hole 26 that does not fit with a crankshaft at the other end, and these In a method for manufacturing a connecting rod IOd for an internal combustion engine, which includes a weighing portion 13 ( ) connecting between the rod-shaped rod 10 , in the first step, a desired uneven thickness is given to the rod-shaped moon 10 , and at both ends thereof. A double-headed element A with a spherical head "if;, 12G formed: A10 (- is molded, and in the second step [)IJ the double-headed element 0C is made into a surplus due to variations in the volume of the element, ← relief part of Closed forging mold 50+ 53+ in which 67.68 is extended to the front small end hole 27 and large end hole 2G in the axial direction of the axial direction of the crisscross die carved part 54 and extends B'2.
A method for producing a connecting rod for an internal combustion engine, which comprises performing sealed forging to a desired connecting rod in step 60.