JPH0783914B2 - Hot forging method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention reduces the cycle time to
The present invention relates to a hot forging method that sufficiently improves the work efficiency of forging work.

(Prior Art) When the forging including the first step, the second step and the third step is performed by one forging press, generally, as shown in FIG. The first forging die 1 paired up and down to perform forging, the second forging die 2 for performing forging in the second step, and the third forging die 3 for performing forging in the third step are one forging. In a state where they are aligned with each other and attached to the press, first, the heated work W conveyed into the first forging die 1 is worked W ₁ by forging in the first step.
After a, the workpiece W _1, a workpiece W ₂ by forging in the second step by the second forging die 2, then the work W ₂
To a forged product by the third forging in the third forging die 3, and finally, a work W as the forged product.
_The work is transported and molded by taking out 3 from the third forging die 3 onto the temporary placing table 4.

By the way, in such a forging step, there is a risk that the heated work will bite into the second and third forging dies 2 and 3 after the forging is completed, especially in the second and third steps where the forged shape becomes complicated. Since it is extremely high, it is necessary to inject an anti-biting liquid for preventing the biting of the work into the forging dies 2 and 3, for example, an aqueous carbon solution, at an appropriate time.

Here, the issue of the injection timing of the carbon aqueous solution is that before the carbon aqueous solution is dried, when the work is conveyed into the forging dies 2 and 3 and set, a slip occurs in the work. Since it is easy and it is extremely difficult to set it to the regular position, it is because a time interval from the jetting of the carbon aqueous solution to the setting of the work is required until the carbon aqueous solution is completely dried. is there.

Therefore, in the prior art, in most cases, hot forging was performed by following the first to sixth steps as shown in FIG. 7 using two types of conveying means as shown in FIG. .

Here, the one conveying means 5 shown in FIG. 6 (a) is moved forward and backward with respect to the fixed claw 6a bent substantially in the shape of L and the bent end portion of the fixed claw 6a to move the work W It comprises a movable claw 6b for providing a clamp and an unclamp, and a reciprocating drive means (not shown) for integrally advancing and retracting these both claws 6a, 6b with respect to the first forging die 1. Fifth
The rod-shaped work w shown in the figure functions to carry in the first forging die 1 and set it at a predetermined position.

Further, the other conveying means 7 shown in FIG. 6 (b) is, for example, when the pitch of the forging dies 1, 2, 3 and the temporary placing table 4 shown in FIG. A pair of two fingers 9a, 9b, 10a, 10b and 11a, 11b facing each other are formed on a base frame 8 which is reciprocally driven in the direction of alignment of the first, second, and third directions, and in each direction orthogonal to the direction of alignment.
Are provided at intervals equal to the pitch p of the forging dies 1, 2, and 3, and the fingers of each pair are 9a, 9b, 10a, 10
Each of b and 11a, 11b can be moved forward and backward in a direction toward and away from each other by a driving means (not shown), and further, on the axes of the fingers 10a, 10b located at the center, on the upper and lower surfaces of the base frame 8. An opening 12 for opening an aqueous carbon solution is provided. Such transport means 7
Inserts the workpiece W ₁ formed by the first forging die ₁ into the fingers 9
a, 9b, the work W ₂ formed by the second forging die 2 is held by the fingers 10a, 10b, and the work W ₃ formed by the third forging die 3 is held by the fingers 11a, 111b, respectively. , Based on the shift of the base frame 8 in each direction, the workpieces W ₁ , W ₂ and W ₃ are conveyed to the next process position and set at a predetermined position.

Here, in the conventional hot forging using the respective transport means 5 and 7, in the first step, the work W ₁ formed by the first forging die ₁ is transferred to the fingers 9a of the transport means 7. 9b
While being gripped by and conveyed to the second forging die 2, the conveying means 7
In this carrying posture, the aqueous carbon solution is jetted to the third forging die 3 which is exactly opposite to the jet outlet 12, and in the second step,
Work W ₁ is forged in the second step by the second forging die,
Then, in the third step, the work W ₂ subjected to the forging in the second step is gripped by the fingers 10a and 10b of the transfer means 7 and transferred to the third forging die in which the aqueous carbon solution has dried,
In the fourth step, the work W ₂ is subjected to the forging in the third step to form the work W ₃ as a forged product. And
In the fifth step, first, each forging die 1, 2,
Based on the entrance of the conveying means 7 between the upper and lower molds of 3, the spout 12
To the second forging die 2 facing the
Then, the work W ₃ is carried out onto the temporary placing table 4 by the action of the fingers 11a and 11b of the carrying means 7, and then the work W is carried into the first forging die 1 by the carrying means 5, 6
In the step, the work W is subjected to the forging in the first step.

In this way, after finishing one cycle of hot forging, the same steps as described above are sequentially repeated,
Then, the work W ₃ on the temporary table is transported to the next processing step.

(Problems to be Solved by the Invention) However, in such a conventional technique, at each forging stroke of the forging press, only one work is always present in the forging press. -Forging is performed only in any one of the third forging dies, so three forging strokes of the forging press are required to manufacture the forged product by performing the forging in the first to third steps. At the same time, it is necessary to carry out other operations associated with each of those forging strokes, and as a result, one forged product is manufactured only after going through the first step to the sixth step. There was a problem that the work efficiency was extremely low.

The present invention has been made by paying attention to such problems of the prior art, and in particular, in relation to the operation of the conveying means, it is possible to simultaneously forge two workpieces with one forging stroke of a forging press. It is intended to provide a hot forging method which brings about a remarkable improvement in working efficiency of the forging work by smoothing.

(Means for Solving Problems) In the hot forging method of the present invention, the forging of the first step and the third step is simultaneously performed in the first step of the forging work, and the first step is performed in the second step. The work that finished the process,
It is transported to the second forging step position by one of the transportation means,
Further, the forged product that has finished the third step is taken out of the die by the other conveying means, and, under the taking-out posture of the other conveying means, the forging die at the third forging step position, in other words, the third forging die. In the third step, the anti-sticking liquid is sprayed, and the second step is forged, and in the fourth step, the work is carried into the first forging step position by the one transfer means, and The workpiece which has completed the second step is conveyed to the third forging step position by the other conveying means, and subsequently, the anti-biting liquid is sprayed on the forging die at the second forging step position, in other words, the second forging die. It is characterized by doing.

(Operation) In this hot forging method, forging of the forging press, for example, by the two forging dies at the first forging stroke is performed simultaneously, and then by the other forging dies by the second forging stroke. By performing forging, one forged product is manufactured with two forging strokes of the forging press, and the total number of steps can be reduced to 4 steps, resulting in a significant improvement in the work efficiency of forging work. Be done.

In addition, here, in the first step of the forging work, the forging of the first step and the third step is performed, and in the second step, each work finished each step is conveyed to the next step, and the third forging die is performed. Then, in the third step, forging of the second step is performed, and then in the fourth step, the work that has finished the second step is carried out to the next step and the first step position. By loading a new work into the second forging die and injecting the anti-seize liquid into the second forging die, it is not necessary for the forging die to which the anti-seize liquid is applied to perform work in the next step. Since a sufficient time interval for drying the anti-sticking liquid can be taken, the work can be set in the second and third forging dies at all times without fear of slipping.

(Example) Hereinafter, the present invention will be described based on illustrated examples.

FIG. 1 is a diagram illustrating the hot forging method of the present invention, and FIG. 2 is a schematic plan view illustrating an apparatus for carrying out the present invention.

In this example, in the forging press 21, the arrangement pitch between the first forging die 22 and the second forging die 23 is 265 mm, the arrangement pitch between the second forging die 23 and the third forging die 24 is 342.5 mm, The arrangement pitch of the forging die 24 and the temporary placing table 25 is 472.5 mm, and one of the conveying means 26 is provided on the side portion of the forging press 21 on the first forging die side.
Then, on the rear side of each of the forging dies 22, 23, 24, the other conveying means 27 is arranged. 28 is a temporary stand.
25 shows a transfer means for taking out the work W ₃ conveyed to the upper side to the next step.

Here, one of the transport means 26 shown in FIG.
Is an L-shaped fixed claw similar to the conveying means 5 described in the conventional example.
26a and a movable claw 26b which is moved forward and backward with respect to the fixed claw 26a, a reciprocating drive means (not shown) for advancing these claws 26a, 26b to the position of the second forging die 23, and both claws 26a. ,
26b is rotated about the central axis over a range of at least 90 degrees. This also includes a rotation drive means (not shown).

As shown in FIG. 4, the other conveying means 27 has four rods 30a, 30b and 31a, 31b on the base frame 29.
Are supported by penetrating them in parallel with each other as a pair, so that each of them is slidable in the axial direction, and the right ends of the two respective rods 30a, 31a are shown in the figure. , Each of the rods 30b, 31b having a shape corresponding to each of the workpieces W ₂ and W ₃ and forming a pair.
Inward fingers 30c and 31c offset downwards
And also other two of each rod 30b, the 31b, the left end of the figure, which also has a shape corresponding to the respective workpiece W _2, W ₃ contour, offset from each axis Other inward flanges 30d, 31d that project to the lower side without
And the respective racks 32a, 32b and 33a, 33b provided facing each other on the respective rods 30a, 30b and 31a, 31b forming a pair, the pinion.
33, 34 are engaged with each other, and the right end of one rod 30a is connected to the cylinder 36 via the floating connector 35, while the right end of the rod 30a is connected to the cylinder 36.
The crossbar 38 fixed by the lock nut 37 is connected to the rod 31a by another lock nut 39. Here, the right ends of the other rods 30b and 31b penetrate the crossbar 38 extending in the direction orthogonal to their axes, and can be freely displaced relative thereto.

Further, here, at the end portion of the base frame 29 closer to the first forging die, each pair of inward fingers 30c, 30d and 31 is provided.
c, 31d is provided with a spout 40 located at a predetermined interval,
From this ejection port 40, it is possible to eject the anti-biting liquid for preventing the biting of the work to the forging die.

Here, when the arrangement pitches of the respective forging dies 22, 23, 24 and the temporary placing table 25 are determined as described above, the work W ₂
And fingers 30c, 30d which functions to grip the finger 31c which serves to hold the workpiece W _3, and 130mm distance between the center axis of the 31d, also, finger 30c, the central axis of the 30d and spout 40 The distance is 342.5 mm.

When the respective dimensions are selected as described above, when the transfer means 27 is attached to a robot and horizontally moved, for example, when the fingers 31c and 31d are located at the center of the temporary placement table 25, the ejection port 40 is 3 Forging die 24 has just reached the position corresponding to it, and fingers 30c, 30d are the third forging die 2
When located in the center of 4, the spout 40 has a second forging die 23.
You will reach the position that corresponds exactly.

The method of the present invention using these transfer devices 26 and 27 will be described below with reference to FIG.

According to this example, in the first step, the work W carried into the first forging die 22 and the work W ₂ carried into the forging die 24 of FIG. The forging of the first step and the third step are simultaneously performed, and in the second step, the work W ₁ having undergone the first step is secondly forged by the one conveying means 26 at the second forging step position. transported to the mold 23, the third finger 31c of the other conveying means 27 to work W ₃ became forged product by ending process, by grasping at 31d provisional table 2
5. While taking out upwards, the anti-sticking liquid is jetted from the jet port 40 to the forging die in the third forging step position, that is, the third forging die 24 while maintaining the taking-out posture of the transporting means 27.

Then, in the third step, the second forging stroke of the forging press 21 performs the second forging process on the work W ₁ to form the work W _2, and in the fourth step,
While carrying the material work W into the first forging die 22 existing at the first forging step position by the one conveying means 26,
The work W ₂ for which the forging in the second step has been completed is transferred to the other transfer means.
By gripping the fingers 30c, 30d of 27, it is conveyed to the third forging die 24 existing in the third forging step position, and subsequently,
In the forging die at the second forging step position, that is, the second forging die 23,
The anti-eating liquid is jetted from the jet port 40.

Thus, here, one forging cycle is completed by these series of steps, and the subsequent forging cycle is performed by sequentially repeating the above-mentioned steps. In the two forging strokes, the work is forged in the first step, the second step, and the third step, and the total number of steps is reduced to four steps, so the work efficiency of forging work is improved. Will be significantly improved.

On the other hand, here, from the injection of the anti-sticking liquid to the second forging die 23 and the third forging die 24, the loading and setting of the respective works W ₁ and W ₂ into these forging dies 23 and 24 are performed. Since there is a time interval corresponding to one step until, the respective works W ₁ and W ₂ are set in the respective forging dies 23 and 24 after the anti-sticking liquid is sufficiently dried. As a result, the workpieces W ₁ and W ₂ can be accurately positioned as expected.

The present invention has been described above based on the illustrated example, but as long as each of the above-described first to fourth steps can be sufficiently performed, the configuration of each conveying device, the arrangement pitch of each forging die, and the like are required. It can be changed as appropriate.

(Effect of the invention) Therefore, according to the present invention, in particular, by performing forging of two kinds of works in each step with one forging stroke of the forging press, two forging strokes of the forging press are performed. Since one forged product can be manufactured and the number of steps in one forging cycle can be reduced to four steps, the work efficiency of the forging work is significantly improved.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the invention, FIG. 2 is a schematic plan view illustrating an embodiment of the invention, and FIG. 3 is a perspective view showing a main part of one conveying means. The figure is a side view showing the other conveying means and a cross-sectional plan view of the main part, FIG. 5 is a schematic view showing the procedure of hot forging, FIG. 6 is a perspective view of the conveying means used in the conventional method, and FIG. It is a diagram showing a conventional method. W, W ₁ , W ₂ , W ₃ ... Work 21 ... Forging press, 22 ... First forging die 23 ... Second forging die, 24 ... Third forging die 25 ... Temporary stand, 26, 27 ... Conveying means 26a ... Fixed Claw, 26b ... Movable claw 29 ... Base frame, 30a, 30b, 31a, 31b ... Rod 30c, 30d, 31c, 31d ... Finger 36 ... Cylinder, 40 ... Jet port

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-60-56434 (JP, A) Actually opened 59-135842 (JP, U) Actually opened 61-163062 (JP, U)

Claims (1)

[Claims] 1. When performing a forging operation consisting of a first step, a second step and a third step with one forging press, at the first step of the forging operation, the forging of the first step and the third step are carried out simultaneously. In the second step of the work, the work that has completed the first step is transferred to the second forging step position by one of the transfer means, and the forged product that has completed the third step is transferred to the die by the other transfer means. Take it out and
Injecting the anti-eating liquid into the forging die at the third forging step position,
Then, in the third step, the forging of the second step is carried out, and further, in the fourth step, the first one is carried out by the one conveying means.
While carrying the work to the forging process position, the second finishing work is carried to the third forging process position by the other carrying means, and then the forging die at the second forging process position is fed. A hot forging method comprising spraying an anti-sticking liquid.