JPH0241729A - Closed forging press - Google Patents

Abstract

PURPOSE:To improve the accuracy of a product and the safety of an equipment by providing a pressure receiving member floating-supported on a lower die and displacing the lower die downward in a gap in a pressing state. CONSTITUTION:A press hydraulic cylinder device 31, a pressure converter member 41, a booster cylinder device 51 are combined and arranged in a press bed 1. The inner pressures in cylinder chambers 53, 33 of a booster device 51 and a hydraulic cylinder device 31 are established to a prescribed valve by pressurizing devices 57, 37. In this case, a pressure receiving means 30 pushes a lower die 10 upward and the locking part 11 of the lower die 10 is held to a specified surface of the ceiling position. When a slug W is set on the lower die 10 floating-supported and a work is pressed by the drop of a slide 2, the hydraulic device 31 holds all load and the fall of the lower die 10 is allowed by the error of the slug W. Both the accuracy of the product and the safety of the equipment are improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a closed forging press, and particularly to one in which a mold is supported in a floating manner.

[Prior art] The so-called closed forging processing includes swaging processing in which the cross-sectional area of the product increases relative to the slag (material) cross-sectional area, extrusion processing in which the product cross-sectional area decreases, and composite processing that combines these.
Good material yield and press load can be minimized.

In conventional closed forging presses, the upper mold slides and the lower mold is fixed to the bolster through attachment/detachment means, and the slug is shaped into a predetermined shape within the space formed inside these molds (upper mold, lower mold). Generally, the structure is such that it is molded into a shape.

If we take the swaging process as an example, the swaging part is restrained by the mold and no flaking occurs, so the press load (pressure) can be kept to a minimum and the product can be molded to a predetermined size.

[Problems to be Solved by the Invention] However, the above conventional structure had the following problems.

That is, the shape of the space formed by the mold is determined based on the product dimensional accuracy and the slug size. In the past, slag size management was troublesome and the yield was poor.

Furthermore, slag dimensional accuracy is limited due to problems such as the slag manufacturing machine and the purchase price. Therefore, if the slug size is small, it is difficult to guarantee product accuracy. On the other hand, if the slag size is large, an excessive load will be generated on the entire die and forging press, resulting in damage or breakage due to the overload.

On the other hand, from the viewpoint of preventing press load fluctuations and overload generation, it may be possible to configure the mold so that a predetermined space remains within the mold even after molding, but in this case, product accuracy or Not only is it stable, but it also requires secondary processing, so depending on the final product accuracy and product use, it may be acceptable or a foolproof measure.

Moreover, since the forging press and mold manufacturer and the press user who procures slag are two different people, it is very difficult to ensure consistency between them, which not only places a huge burden on the user in management and labor, but also ensures safety.・The request for improvement is strong from the perspective of improving productivity.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a closed forging press that can achieve highly accurate and smooth forming while preventing press load fluctuations and overloads even if there are variations in slug size. be.

[Means for Solving the Problems] The present invention supports a mold in a floating manner by means of pressure receiving means that supports the entire press load and allows vertical displacement of the mold, and is formed so as to absorb slug dimensional errors. It is.

That is, the lower mold is mounted on a bolster so as to be displaceable within the gap formed between the upper limit position regulating surface and the lower limit position regulating surface, and includes a pressure receiving member that engages directly or indirectly with the lower mold, The bed is equipped with a pressure receiving means that urges the lower die to contact the upper limit position regulating surface in a no-load state, carries the entire press load in the press function, and allows the lower die to be displaced downward within the gap. The lower die is floatingly supported on the bolster to prevent loads due to dimensional errors in the slug.

Further, the upper mold is mounted on the slide so as to be displaceable within a gap formed between the lower limit position regulating surface and the upper limit position regulating surface, and includes a pressure receiving member that engages directly or indirectly with the upper mold, Slide the pressure receiving means that urges the upper die to come into contact with the lower limit position regulating surface in the no-load state, supports the full press pressure in the press state, and allows the upper die to move upward within the gap. The upper die is floatingly supported on the slide to prevent overload due to dimensional errors in the slug.

[Function] In the present invention having the above configuration, for example, when the lower mold is floatingly supported on the bolster, when the slide and upper mold are lowered and sealing is performed with both molds, even if the slag dimension is slightly larger than the standard dimension, the pressure receiving means supports the entire press load while allowing downward displacement of the lower mold.

Therefore, the occurrence of overload can be prevented, and the product can be molded with high precision without causing any cracks.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

(First Embodiment) As shown in FIG. 1, the closed forging press of this embodiment is roughly divided into a lower die 10 movably supported by a bolster 3, an upper die 20 and a lower die 10 attached to a slide 2. and a rectangular pressure receiving means 30 for supporting the float ink.

Note that FIG. 1 shows the left half of the center line or the middle of the descent of the slide 2, and the right half shows the case where the slide 2 has reached the lower limit position.

The second type 20 is fixed to the slide 2 via a tie holder 25 consisting of a support portion 25A and a plate portion 25B.

21 is a locking portion.

These slides 2. Daiholta 25. A punch 27. A knockout pin 28 is fitted.

On the other hand, the lower mold 10 includes a support portion 15A, plate portions 1 and 5.
It is attached to the bolster 3 via a tie bolter 15 made of B so that it can be displaced in the vertical direction.

That is, the upper limit position regulating surface 1 provided on the support portion 15A
3 and the lower limit position regulating surface 14 provided on the plate portion 15B.
A locking portion 11 is installed in a gap S formed between the two.

Now, the pressure receiving means 30 is a means for supporting the entire press load and allowing the lower die 10 to be displaced downward within the gap S, and is disposed within the bed 1. Therefore, in the no-load state, the lower die 1o is urged to come into contact with the upper limit position regulating surface 13.

The pressure receiving means 30 is connected to the lower mold 1o via a pressure receiving member 45. In this embodiment, the pressure receiving member 45 is
A pressure receiving plate 46 displaceably mounted within the bolster 5 and an insert plate 47 displaceably mounted within the bolster 3.
It is formed from.

It indirectly engages with the lower die 10.

The specific configuration is shown in FIG.

In FIG. 2, a pressure receiving means 30 is composed of a hydraulic cylinder device 31, a pressure converting member 41, and a booster cylinder device 51. While receiving the full press load, the lower mold 1
In order to reliably and smoothly perform the zero displacement, and to downsize the equipment and reduce costs, a combination of a hydraulic cylinder device 31, which mainly takes charge of the pressure receiving mechanism, and a booster cylinder device 31, which mainly takes charge of the displacement tolerance function, is used. .

Here, the hydraulic cylinder device 31 includes a cylinder 32 screwed to the bed 1, a piston 34 mounted in the cylinder 32 so as to be able to come into contact with a pressure receiving member 45 (insert plate 47), and the cylinder 32 and the piston 34. and a pressurizing device 37 that supplies high pressure oil into the cylinder chamber 33 formed between the two. Note that 35 is a sealing member.

Since the hydraulic cylinder device 31 receives a large full press load, the lower end surface 34D of the piston 34 has a large diameter. Further, since the cylinder chamber 33 is good enough to allow displacement of the lower die 10 within the gap S, it is formed to be thin in the vertical direction.

Therefore, the pressurizing device 37 (oil tank 38, air-operated pump 39) only needs to supply a small amount of high-pressure oil for replenishing the leak in the small-capacity cylinder chamber 33, and can be extremely miniaturized. Furthermore, the pressurizing device 37 has a simple structure because it does not include a mechanism for adjusting the hydraulic pressure inside the cylinder chamber 33 due to the displacement of the lower die 10 within the gap S.

On the other hand, the booster cylinder device 51 has the above-mentioned hydraulic adjustment function. That is, it exhibits a displacement permitting function of the lower mold 10, and is composed of a large-diameter cylinder 52, a piston 54, and a pressurizing device 57 for pressurizing air inside the cylinder chamber 53. 55 is a sealing material.

In this embodiment, the piston 54 is fixed to the bed 1. Further, the cylinder 52 and the piston 54 slide and guide the knockout pin 18 via a bush 56. The pressurizing device 57 includes a buffer tank 58 and a pressure regulating valve 59.

The hydraulic cylinder device 31 and the booster cylinder device 51 are connected by a pressure displacement converting member 41.

The pressure displacement converting member 41 has a hollow cylindrical shape, and the upper @ 41
H is fitted into the small diameter portion 343 of the piston 34, is attached so as to seal the cylinder chamber 33 with the sealing material 55, 55, and is movable relative to the piston 34 and the cylinder 32. Further, the lower end 41L is fixed to the cylinder 52.

Further, the area of the upper end surface 41U is the lower end surface 34 of the piston 34.
It is approximately 1/16 of the area of D.

In this regard, the area of the upper end surface 54U of the piston 54 is approximately 36 times larger than the area of the upper end surface 41U.

If the piston 34 does not move downward by 1 mm, the pressure displacement converting member 41 moves downward by 16 mm.

Furthermore, if the oil pressure in the cylinder chamber 33 is 350 kg/m2g, the air pressure in the cylinder chamber 53 is 7 g/m2g.

Next, the action will be explained.

The pressure device 57 establishes the internal pressure of the cylinder chamber 53 of the booster cylinder device 51 to a predetermined value. Further, the pressure device 37 establishes the internal pressure of the cylinder chamber 33 of the hydraulic cylinder device 31 to a predetermined value.

The internal pressure of the cylinder chamber 53 and the internal pressure of the cylinder chamber 33 are the product of the internal pressure of the cylinder chamber 53 and the area of the upper end surface 54U of the piston 54. The relationship is such that it is slightly larger than the product with the U area.

Therefore, the pressure receiving means 30 is connected to the lower die 10 via the pressure receiving member 45 (insert plate 47 and pressure receiving plate 46).
push upward. The lower die 10 is held at the upper limit position (see the left half of the center line in FIG. 1) by being in contact with the locking portion 11 or the upper limit position regulating surface 13.

That is, in this state, a gap S exists between the locking portion 11 and the lower limit position regulating surface 14. No, lower mold 1
0, the area of the lower end surface 34D of the piston 34 and the cylinder chamber 3
3 internal pressure (in detail, the upper end surface 54U of the piston 54)
When a downward load larger than the product of the area and the internal pressure of the cylinder chamber 53 is applied, the lower die 10 can be displaced downward.

Here, it is understood that the lower mold 10 is floatingly supported by the bolster 3 (bed 1).

Now, the slug W is set on this floating-supported lower die 10 by appropriate means.

In this case, if the dimensional accuracy of the slug W is accurate, the upper mold 20 and the lower mold 10 that descend together with the slide 2 will press the slug W and maintain accuracy within the closed space formed within both molds 10, 20. The forging process ends when the 6-slide 2, which can be well forged, reaches the bottom dead center.

Even when the slide 2 reaches the bottom dead center, the lower mold 10 remains in contact with the locking portion 11 or the upper limit position regulating surface 13, and does not move within the gap S.

On the other hand, there is an error in the dimensional accuracy of the slag W, and the slag W
Consider the case where the size of is large.

Lower mold 10 or conventional'! If the slide 2 is fixed to the bolster 3, such as in an F4 structure, an excessive load will occur when the slide 2 reaches the bottom dead center, and the punch 27. Counter punch 17. This will cause damage to the molds (10, 20) and the press machine. In addition, fringing occurs and accuracy is reduced, and the product cannot be manufactured without post-processing.

In the present invention, this problem is solved by the action of the acceptance means 30.

That is, slide 2 descends and the lower mold 10 (upper mold 20)
If a load greater than the predetermined press load is generated, the piston 34 of the hydraulic cylinder device 31 or the pressure receiving member 45 (4
6, 47). Then, the oil pressure in the cylinder chamber 33 increases, and the pressure displacement converting member 41 moves significantly downward in FIG.

Therefore, the hydraulic cylinder device 31 maintains the full press load and allows the lower mold 10 to descend by a displacement amount corresponding to the dimensional error of the slug W. On the other hand, the internal pressure of the cylinder chamber 33 is
The pressure is kept constant by lowering the pressure displacement converting member 41.

This downward movement of the pressure displacement converting member 41 is absorbed by a booster cylinder device 51 forming an accumulator. That is, as the cylinder 52 descends, the air in the cylinder chamber 53 is released to the atmosphere by the pressure regulating valve 59, and the internal pressure of the cylinder chamber 53 is kept constant.

After the slide 2 has been raised, the knockout pin 18.2
8, the products are discharged from the molds 10, 20.

According to this embodiment, the lower die 10 is moved to the bolster 3.
Since the slug W is held so as to be movable and is supported floatingly by the pressure receiving means 30, even if the size of the slug W is larger than a reference value, an excessive load will not occur, and no flaking will occur. Therefore, punches 17, 27, molds 10, 2
0 etc. will not be damaged. Furthermore, high-precision products can be produced without requiring post-processing or the like.

In addition, the allowable movement displacement of the lower die 10 is the upper limit position regulating surface 1
3 and the lower limit position regulating surface 14 can be arbitrarily determined. Therefore, by setting the dimensional accuracy of the slug W to be slightly larger than the reference value, the adjustment and management of the slug W can be greatly simplified.

Further, since the pressure receiving means 30 is composed of a hydraulic cylinder device 31, a booster cylinder device 51, and a pressure displacement converting member 41 that connects these, the hydraulic cylinder device 3
1 can be made extremely small in capacity and compact, and the booster cylinder unit W51 can be of a low pressure type, resulting in an overall small size and low cost.

(Second Embodiment) In the second embodiment, unlike the first embodiment, the lower mold 10 is supported by a float on the bolster 3 and the pressure receiving means 30 is housed in the bed 1, whereas the second mold 20 is slid. This is a case where the float ink is supported by the slide 2 and the pressure receiving means 30 is housed inside the slide 2.

However, since it can be estimated very easily from FIGS. 1 and 2, its configuration is omitted from illustration.

That is, in the first repair example, the "lower mold 10" is replaced with the "upper mold 20", the "bolster 3" is replaced with the "slide 2", and the pressure receiving means 30 is replaced with the lower mold 10 in the no-load state. The position limit surface is brought into contact with the upper die 20 in no-load condition.
This is because ``allowing the lower die 10 to move downward'' may be replaced with ``allowing the upper die 20 to move upward''.

However, this embodiment can achieve the same effects as the first embodiment.

In the above embodiment, the pressure receiving means 30 is composed of the hydraulic cylinder device 31, the pressure displacement converting member 41, and the booster cylinder device 51, but in short, the pressure receiving means 30 is configured to receive the entire press load and the lower die 10 (upper die 20). Since it is possible to support the floating ink so that it can be displaced with respect to the bolster 3 (slide 2), the structure is not limited to the above disclosed structure and can be implemented as an arbitrary structure.

[Effects of the Invention] As is clear from the above explanation, the present invention is capable of hermetic forging of high-precision products without causing overload or destroying the mold etc. even if the dimensional accuracy of the slag changes. Has excellent effects.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, mainly showing a mold part, and FIG. 2 is a sectional view showing mainly a pressure receiving means. 2... Slide, 3... Bolster, 10... Lower die, 13... Upper limit position regulating surface, 14... Lower limit position regulating surface, 20... Upper die 30... Pressure receiving means, 31... Hydraulic cylinder device, 41... Pressure displacement conversion member, 45... Pressure receiving member, 51... Booster cylinder device.

Claims (2)

[Claims] (1) The lower mold is mounted on a bolster so that it can be displaced within the gap formed between the upper limit position regulating surface and the lower limit position regulating surface, and is formed to include a pressure receiving member that engages directly or indirectly with the lower mold. , a pressure receiving means that urges the lower die to contact the upper limit position regulating surface in the no-load state, supports the entire press load in the press state, and allows the lower die to be displaced downward within the gap. A closed forging press characterized by being arranged in a bed and configured so that the lower die is floatingly supported on a bolster to prevent overload due to slug dimensional errors. (2) The upper die is mounted on the slide so as to be displaceable within the gap formed between the lower limit position regulating surface and the upper limit position regulating surface, and is formed to include a pressure receiving member that engages directly or indirectly with the upper die. , a pressure receiving means that urges the upper die to contact the lower limit position regulating surface in the no-load state, supports the entire press load in the press state, and allows the upper die to be displaced upward within the gap. A closed forging press characterized by being disposed within a slide and configured to allow an upper die to be supported in a floating manner relative to the slide to prevent overload due to dimensional errors in the slug.