JPS5978743A - Forming device for reinforcing rib in common use for setting of connecting rod for internal-combustion engine - Google Patents

Abstract

PURPOSE:To provide a titled forming device which performs continuously the shape setting of a connecting rod and an operation for forming a reinforcing rib by fitting the connecting rod into the cavity provided on both superposed surfaces of a movable die and a stationary die and grasping the same by both dies thereby setting the shape. CONSTITUTION:A movable die 3 and a cam driver 12 are moved upward and a cam slide 8 is retreated to a chained line position to set the shape of a connecting rod 16 for an internal-combustion engine and to form a reinforcing rib on the outside circumferential part in a large end part 16c. The rod 16 is fitted in the 1st recess 51 of a stationary die 1 by fitting the piston hole h1 and crank pin hole h2 thereof respectively into the 1st and 2nd positioning pins 61, 62. The die 3 and the driver 12 are lowered respectively to fit the 1st recess 51 of the die 3 to the rod 16 and to fit the pins 61, 62 to the 1st, 2nd pinholes 71, 72 of the die 3. The rod 16 is fitted into the cavity C delineated by the cooperation of both recesses 51, and the rod is grasped between both dies 1 and 3, so that the collapsion in shape such as bend or the like generated in the rod 16 by the forming stage for the hole h1, etc. is set.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention corrects the shape of a connecting rod for an internal combustion engine, that is, a connecting rod integrally provided with an annular small end at one end of the frame and an annular large end at the other end of the frame. Part 2 relates to a correction and reinforcing rib forming device that forms reinforcing ribs extending in the circumferential direction on the outer circumferential surface of the large end on the side opposite to the side where the frame is connected.

Conventionally, this type of connecting rod is formed by die forging using heated round bar material, and then piston pin holes and crank pin holes are formed at the small end and large end, respectively. Mold mesh such as bending may occur, and in this case, the shape of the connecting rod must be corrected.

In addition, since the annular large end is divided into two parts in a direction perpendicular to the frame axis direction, reinforcing ribs extending in the circumferential direction are provided on the outer circumferential surface of the large end to provide strength to the divided half-ring i'if4 halves. If such correction work and reinforcing rib forming work were performed using separate devices, the work efficiency would be poor, but if these tasks were performed using one device, it would be possible to If it can be performed continuously, it is extremely advantageous in improving work efficiency.

It is an object of the present invention to provide the above-mentioned correction and reinforcing lip molding device.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In FIG. 2, 1 is a fixed mold fixed to a substrate 2, and above it is a movable mold 3 with a plurality of cushion pins 4.
It is attached to the movable part of the press device (not shown) via
Thereby, the movable mold 3 can be raised and lowered relative to the fixed mold 1, and in the lowered position, it can cooperate with the fixed mold 1 to pinch the connecting rod. On each overlapping surface of both molds 1 and 3, a J-th recess 5° defining a connecting rod fitting cavity C and a second fourth portion 52 defining a reinforcing rib forming punch insertion hole communicating with the cavity C are provided. It is formed. Also fixed type 1
The first one is fitted into the piston pin hole at the small end of the connecting rod and the crank pin hole at the big end of the connecting rod. Second positioning pins 61 and 62 are fixed to protrude from the second recess 51, and these positioning pins 61. 62, which fits with the tip of the first. Second pin hole7. ．． 72 is movable type 3
is formed.

A cam slide 8 is slidably disposed on the board 2 on the side of the insertion hole H so that it can move forward and backward with respect to the fixed mold 1,
A reinforcing rib forming punch 9 that is inserted into the insertion hole H is protruded from the vertical front surface 8a of the cam slide 8. punch 9
The distal end portion is formed to have a convex longitudinal section, and the distal end portion is always slidably fitted into the second recess 52 of the fixed mold 1.

A movable plate 11 is disposed above the movable mold 3 and moves up and down guided by a plurality of guides 110. On the lower surface of the movable plate 11, an inclined front surface 12α is slid onto the inclined rear surface 8b of the cam slide 8. A cam driver 12 is fixed which contacts and advances it towards the fixed mold 1. A sliding guide plate 13 is vertically provided on the substrate 2 and slides on the vertical rear surface 12b of the cam driver 12 to guide its up and down movement. An elastic body 15 made of urethane or the like is disposed in a compressed state between the enlarged rear end portion of the pin 14 and the rear surface of the guide plate 13 for retracting the cam slide 8.

The connecting rod 16 can be easily forged from a round bar material as it is, or by rolling and heating the round bar material, a die forging process that sequentially performs rough forming and then finish forming, a deburring process, and a piston pin. The connecting rod 16 is manufactured through a hole and crankshaft hole forming process, and thereby the connecting rod 16 is integrally provided with an annular small end portion 165 and an annular large end portion 16C at both ends of the frame portion 16α.The crank pin of the large end portion 16C The hole h2 is formed into an elliptical shape in consideration of the blade thickness of the cutting tool since the large end portion 16C will later be divided into two in a direction perpendicular to the frame axis direction, and therefore the second pin 62 has an elliptical cross section. It is formed.

The shape of the connecting rod 16 is corrected, and the large end 16.
? When molding reinforcing ribs on the outer peripheral surface, the movable die 3 and cam driver 12 are raised and the cam slide 8 is moved to the jth position.
Retract it to the position shown by the chain line in the figure. and connecting rod 16
, its piston pin hole h1 and crank pin hole h2
each].

The first positioning pin of fixed mold 1 is inserted into the second positioning pin 61.6□.
It fits into the fourth part 51. Next, the movable mold 3 and the cam driver 12 are lowered, respectively, and the first recess 5 of the movable mold 3 is lowered. (fitted into the connecting rod 16) together with the first. Second positioning pin 6, . 62 respectively to the first movable mold 3. It fits into the second bottle holes 7□ and 72. As a result, the connecting rod 16 is inserted into the cavity C defined by the cooperation of the four parts 51 of both cylinders J.
Since the connecting rod 16 is fitted and compressed between the two molds 1 and 3, it is possible to correct mold part distortion such as bending that occurs in the connecting rod 16 during the piston pin hole forming process or the like.

On the other hand, as the cam driver 12 descends, FIG. 3(a).

(As shown in hl, the cam slide 8 moves forward, and as a result, the punch 9 moves forward while sliding inside the fitting hole defined by the cooperation of the second and fourth parts 5□ of both dies 1 and 3. Type 1.3
Two reinforcing ribs 16d are press-formed on the outer peripheral surface of the large end 16C of the connecting rod 16, which is pressed between them, in cooperation with the insertion hole.

Next, when the movable mold 3 and cam driver 12 are raised, the cam slide 8 and punch 9 are moved back, so the connecting rod 16 is removed from the fixed mold 1, and the large end 16C is divided into two parts as described above and subjected to predetermined machining. This results in a split connecting rod.

In addition, the above-mentioned No. 1. Second positioning pin 61. 62 to the movable mold 3, and the 1st. The second pin holes 71-72 may be provided in the fixed mold 1, respectively.

As described above, according to the present invention, the connector is fitted into the cavity provided on the overlapping surfaces of both the movable type and the fixed type,
The shape of the connecting rod can be corrected by squeezing it with both molds, and then the outer circumferential surface of the large end of the compressed connecting rod is reinforced with a punch inserted into the insertion hole communicating with the cavity A. Since ribs can be formed, the connecting rod shape correction and reinforcing rib forming operations can be performed continuously, greatly improving the efficiency of these operations.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a vertical side view, FIG. 2 is a sectional view taken along line U-II in FIG. 1, and FIG. 3(a)
, ψ) is an explanatory diagram of the reinforcing rib forming process, and FIG. 4 is an enlarged partial perspective view of the connecting rod. C... Cavity, H... Fitting hole, hl... Piston pin hole, h2... Crank pin hole, 1... Fixed type, 3... Movable type, 68, 6□... No. J, second positioning pin, 7, . 72...1st. 2nd bottle hole, 9...
・Punch, 16... Connecting rod, 16ct... Frame, 11... Small end, 16C... Thick end, 16d...
・Reinforcement rib patent applicant Honda Engineering Co., Ltd. Honda Motor Co., Ltd. Figure 4 Figure 3 (a)

Claims (1)

[Claims] Correcting the shape of a connecting rod for an internal combustion engine, which integrally includes a small annular end at one end of the frame and a large annular end at the other end of the frame, and the large end on the opposite side to the side where the frame is connected. A device for forming reinforcing ribs extending in the circumferential direction on the outer peripheral surface of the connecting rod, comprising a fixed mold and a movable mold that are overlapped with each other to pinch the connecting rod, and a connecting rod fitting cavity in the overlapping surface of both molds; A reinforcing rib forming punch insertion hole communicating with the cavity is provided, and a first hole is provided in one and the other of both molds to be fitted into the piston pin hole at the small end and the crank pin hole at the large end. second locating pins, and a first locating pin that engages with the second locating pins. A device for straightening and reinforcing rib forming a connecting rod for an internal combustion engine, wherein a second pin hole is provided, and a reinforcing rib forming punch that is inserted into the insertion hole is disposed near the fixed die.