JPH074640B2 - Crankshaft forging machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crankshaft forging machine for simultaneously performing a twisting step and a shaping step in a single facility in manufacturing an integrated crankshaft.

2. Description of the Related Art The integrated crankshaft is generally made by forging, and die forging is often used among them. A crankshaft that requires twisting is manufactured by the following process.

Billet cutting-Heating-Rough land forming-Rough die stamping-Finish die stamping-Deburring-Twisting-Shaping-Air cooling In each of the above steps, rough die forming, rough die stamping, finish die stamping, deburring Since the forming direction is only the vertical direction, it is conventionally performed by one forging press. However, the twisting process and the shaping process are performed using separate forging presses.

Not only does this require two forging presses,
Two units for loading and unloading the forging press are also required. Also, in changing the mold, the equipment and man-hours for two facilities are required.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention As described above, since the twisting step and the shaping step in the manufacture of the conventional crankshaft are performed using separate forging presses,
It requires two units of equipment, which not only increases the equipment cost but also increases the production cost due to the increase in man-hours and further increases the process supervision density.

The present invention provides a forging machine that simultaneously performs a twisting step and a shaping step in crankshaft forging with a single facility in order to reduce the facility cost and simplify the process, excluding such drawbacks.

Means for Solving the Problems In order to achieve the above object, the crankshaft forging machine of the present invention includes a twisting type and a shaping type upper die in an upper die holder attached to a shaping ram that is vertically movable by a cylinder. , The lower die holder mounted on the base is attached with the lower type of the twist type and the shaped type of the shaping type respectively, and the path heights of the twisting type and the shaping type are also provided, and the twisting type is a movable type determined by the crankshaft to be processed. The retainer, which is divided into a fixed mold and a movable mold, supports each movable mold in a twistable manner. The retainer includes a semicircular arc-shaped rotating member fitted with the movable mold, and a supporting member supporting the movable mold by rollers so that the movable mold can rotate. The lower support member is attached to the lower die holder, the upper rotating member is attached to the upper die holder, and the lower rotating member is provided with a push-down arm protruding from the lower die holder and is operated by a cylinder provided in the shaping ram. The pushing rod of the torsion ram is the shaping ram It penetrates through the inside and makes the downward tip face the above-mentioned pushing down arms.

Action The work material (integrated crankshaft) that has been twisted by the crankshaft forging machine of the present invention is transferred to a shaping die, and deburring after finishing die stamping in the previous step is finished by another forging machine. When the processed material is put in the twisting die and the shaping ram is lowered, the shaping die performs the shaping work to correct the shape of the crankshaft after the twisting work, and at the same time, the work piece put in the twisting die is twisted. Held by the mold. Subsequently, the twisting ram is lowered and the movable type parts of the twisting type are rotated through the pushing-down arm to perform twisting as an integral crankshaft.

Therefore, with a single forging machine, it is possible to simultaneously perform twisting as a crankshaft and shaping of the crankshaft after the twisting.

Embodiment An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing a main part of a crankshaft forging machine according to an embodiment of the present invention.

The pair of left and right cylinders (8) installed downwards is suspended from the piston rod tips of the cylinders (8).
The upper die holder (5-1) is attached to the lower surface of the shaping ram (6) which is vertically movable by the operation of (8),
The upper mold of the torsion mold (1) and the upper mold of the shaping mold (2) are attached to the upper die holder (5-1), and the lower die holder (5-2) fixed on the base is twisted ( The lower mold of 1) and the lower mold of the shaping mold (2) are attached, and the shaping ram (6) descends so that the upper mold and the lower mold of the twisting mold (1) and the shaping mold (2) respectively. The upper and lower dies are assembled so that the two pass lines have the same height when assembled, and the work material in the twisting die (1) is held by the die when the shaping ram (6) descends. At the same time, the material of the shaping die (2) (which has been formed into a crankshaft shape by undergoing twisting) is pressed and undergoes shaping. With the shaping ram (6) lowered, the cylinder (9) provided in the shaping ram (6) and the pushing rods (7-1) (7-2) penetrating the shaping ram (6) continuously. ) And (7-3) are arranged so that the twisting ram (7) descends and twists.

Now, as an example of the twisting type (1), details of the twisting type (1) for twisting the 6-slow crankshaft (10) for a 4-stroke engine shown in FIG. 2 are shown in FIG.

FIG. 3 (a) shows the upper die holder (5-1) and the lower die holder (5) when the shaping ram (6) is lowered by the operation of the cylinders (8) and (8) to reach the bottom dead center of the press. −
It is a front view which showed the part of the twist type (1) and shaping | molding type (2) of 2), and FIG.3 (b) is an upper die holder (5-1).
FIG. 3 (c) is a plan view of the lower die holder (5-2) seen from below. And FIG. 3 (d) shows
Shaping ram (6) by actuation of cylinders (8) (8)
FIG. 6 is a cross-sectional view seen from the center of the upper and lower die holders when is raised and is at the top dead center of the press.

In the torsion type (1), as shown in FIG. 2, the pin No. 1 and the pin No. 6 at both ends and the pin No. 3 and the pin No. 4 in the center are movable types (1-1) (1-2) and (1). -3),
Pin 2 and pin 5 are fixed type (1-4) (1-
5) divided configuration.

The movable molds (1-1) and (1-2) at both ends are retainers (3-1) and (3-2), and the movable mold (1-3) at the center is the retainer (3-3). It is supported so that it can be twisted. Each retainer is composed of a semicircular arc-shaped rotating member (11) fitted with a movable die, and a supporting member (12) that rotatably supports the rotating member (11) with a roller (13). The supporting member (12)
Is the upper die holder (5-1) and the lower die holder (5
-2), respectively (see FIG. 3 (d)).

Also, the retainer (3-) on the upper die holder (5-1) side
1) The push-down arm (4-) is attached to the rotating member (11) of (3-2).
1) (4-2) is projected, and as shown in FIG. 1, the push-down arm (4-1) is the push rod (7-1) of the twisting ram (7).
In addition, as shown in FIG. 3 (d), the push-down arm (4-
2) faces the push rod (7-2), and the retainer (3-
A push-down arm (4-3) is provided on the rotating member (11) of 3) so as to face the push rod (7-3) of the torsion ram (7) as shown in FIG.

Now, the twisting (1) of the forging machine according to the embodiment of the present invention completes the twisting process, and the work material formed on the integral crankshaft is transferred to the shaping die (2) by a conveyor device (not shown), and at the same time, another forging After the finishing die stamping by the machine, the next work material is put into the twisting die (1) by another conveying device (not shown) and the cylinders (8) (8) are operated to operate the shaping ram (6). Lower the upper die holder (5-
Shaping to correct the crankshaft shape by the shaping die by combining and pressing the upper twisting type and the upper shaping type provided in 1) with the lower twisting type and the lower shaping type provided in the lower die holder (5-2). Simultaneously with processing, the work piece is held by the twisting die (1), and then the cylinder (9) is actuated to lower the twisting ram 7 and push the pushing rods (7-1) (7-2) and ( 7-3) pushes down the push-down arms (4-1), (4-2) and (4-3) downward, and as shown in FIG. 4 (a), the movable types (1-1) (1- 2) The part is rotated counterclockwise by 60 degrees in the figure, and at the same time, the movable die (1-3) is rotated by 60 degrees clockwise as shown in FIG. Twist molding is performed from the state shown in FIG. 2 (b) to the state shown in FIG. 2 (c).

As described above, the crankshaft can be formed by simultaneously performing the twisting process and the shaping process by using one forging machine.

EFFECTS OF THE INVENTION According to the present invention, in the forging of the integrated crankshaft, the twisting process and the shaping process are simultaneously performed by the same equipment, so that the equipment and the process can be simplified, and the equipment cost and the processing cost can be reduced. This can reduce the manufacturing cost of the crankshaft.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a main part of a crankshaft forging machine in an embodiment of the present invention, and FIG. 2 (a) is a front view of a 6-throw crankshaft for a 4-stroke engine manufactured by carrying out the invention. FIG. 3B is an end view showing a state before twisting, FIG. 3C is an end view after twisting, FIG. 3 is an explanatory view of a twisting die according to an embodiment of the present invention, and FIG. Front view at the bottom dead center of the press of the machine, Figure (b) is a plan view from below the upper die holder, Figure (c) is a plan view of the lower die holder, Figure (d) is the top dead center of the press of the forging machine. 3 (b) and (c) along the line AA, and FIG. 4 is a torsion type explanatory view showing a twisted state, and FIG.
The movable dies (1-1) and (1-2) at both ends rotated by 60 degrees are shown in FIG.
3) is shown. DESCRIPTION OF SYMBOLS 1 ... Torsional type 1-1, 1-2, 1-3 ... Movable type 2 ... Shaping type 3-1, 3-2, 3-3 ... Retainer 4-1, 4-3 ... Depressing arm 5-1 ... Upper part Die holder 5-2… Lower die holder 6… Shaping ram 7… Twisting ram 8, 9… Cylinder 10… 6-stroke 6 slow crankshaft 11… Rotating member 12… Supporting member 13… Roller

Claims (1)

[Claims] 1. A twisting type and a shaping type upper die are attached to an upper die holder attached to a shaping ram which is vertically movable by a cylinder, and a twisting type and a shaping type lower are attached to a lower die holder attached to a base. The dies are attached to each other, the same pass height is provided for the twisting type and the shaping type, and the twisting type is divided into a movable type and a fixed type that are determined by the crankshaft to be processed, and a retainer that supports each movable type in a twistable manner. Is a semi-circular rotating member fitted with a movable die and a supporting member for rotatably supporting the rotating member by rollers. The lower supporting member is attached to the lower die holder, and the upper supporting member is the upper die. Attached to the holder, each upper turning member is provided with a pushing down arm, and the pushing rod of the twisting ram that is operated by the cylinder provided in the shaping ram penetrates the shaping ram and Cranks facing the above-mentioned push-down arms Use forging machine.