JPH0718445Y2 - Forged mold structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The disclosed technology belongs to the technical field of a forging die structure for continuously forging a product.

Thus, according to the present invention, an ejector that pushes up a forged product from a lower portion to a predetermined height by the cooperation of the concave portion of the die and the punch is placed on a knockout pin that is driven up and down. A liquid ejection hole is formed on the upper side surface of the ejector, and when the upper part of the ejector projects into the concave part of the die, the liquid for lubrication and cooling sent from the feeder is passed through the knockout pin and the liquid conducting hole of the ejector. Is ejected from the liquid ejecting hole of the ejector to the concave portion of the die to lubricate and cool the concave portion. Further, a stopper is provided on the lower side surface of the ejector so as to project laterally and the ejector is raised. It is a device relating to a forging die structure which is brought into contact with a die and regulates the protruding height thereof to a set amount. Particularly, the upper end of a knockout pin is fitted and engaged with the lower end of an ejector. Both of them are designed in accordance with the forging die structure shock absorption through the cushion material is to be made.

<Prior Art> As is well known, many metal mechanical parts are basically processed and formed by means such as forging and casting, and any of the processing means is continuously processed in response to the recent demand for mass production. Research and development and improvement of technologies that can achieve this are becoming active.

Thus, the forging die that has been conventionally used in forging is, for example, as shown in FIGS. 3, 4, and 5 (in FIG. 1, 1 represents the forging die), and is linked to the knockout pin 4 to form the die. Two
The ejector 5 that can be retracted and stored in the concave portion 3 of the die is installed. With the ejector 5 being lowered, the metal material 6 is put into the concave portion 3 of the die 2, and the punch 7 is lowered from above the metal material 6 to drop the metal. The material 6 is pressed and forged into a desired shape, and then the punch 7 is lifted and at the same time, the ejector 5 is lifted via the knockout pin 4 so that the metal material 6 for which the molding process is completed is predetermined from the recess 3 of the die 2. The metal material 6 is pushed up to a feed level of height and, in that state, the processed metal material 6 is carried out of the die 2 by using a carry-out device (not shown).

Then, the ejector 5 is placed on the upper surface of the knockout pin 4 so that the liquid conducting hole 8 formed in the knockout pin 4 and the liquid conducting hole 9 formed in the ejector 5 communicate with each other. The liquid conducting hole 8 of the knockout pin 4 is electrically connected to a feeding device (not shown) of the liquid 12 for lubricating and cooling through a conducting hole 11 formed in the base block 10, and an upper side surface of the ejector 5 A liquid ejection hole 13 communicating with the liquid conduction hole 9 is formed in the hole, and when the ejector 5 rises to push up the processed metal material 6, the conduction hole 1
1, the liquid 12 for lubrication and cooling can be jetted to the concave portion 3 of the die 2 through the liquid passage holes 8 and 9 and the liquid jet hole 13 to prepare for the next forging. Further, a flange-shaped stopper 14 is provided on the lower side surface of the ejector 5 so that when the ejector 5 rises by a set amount, the die 2
It was made to abut the lower surface of the and its rising height was regulated.

<Problems to be Solved by the Invention> However, in the forging die 1 of the above-described conventional mode, when the ejector 5 reaches the rising end and the stopper 14 on the lower side surface of the ejector 5 contacts the lower surface of the die 2, the knockout pin 4 is released. When the ejector 5 reaches the ascending end, the upper surface of the stopper 14 and the die are prevented from being damaged so that the large upward stress of the ejector 5 is directly transmitted to the abutting portion of the lower surface of the ejector 5. The height of the stopper 14 is adjusted in advance so that a slight gap is formed between the lower surface 15 of the knockout pin 15 and the lower surface 16 of the knockout pin 4 and the lower surface of the ejector 5. , And liquid flowing down through the liquid conducting holes 8 and 9
When the pressure of 12 is large, as shown in FIG. 4, a gap of a predetermined size is formed between the upper surface of the knockout pin 4 and the lower surface of the ejector 5, and the liquid 12 leaks out from the gap. There is a drawback, and furthermore, the leakage of the liquid 12 lowers the ejection pressure of the liquid 12 from the liquid ejection hole 13 and the ejection of the liquid 12 into the recess 3 is not sufficiently performed.

In addition, the liquid flowing down through the conduction hole 11 and the liquid conduction holes 8 and 9
When the pressure of 12 is small, as shown in FIG. 5, on the contrary, a gap 15 is formed between the upper surface of the stopper 14 and the lower surface of the die 2, and the upper surface of the ejector 5 has the original metal material 6 feed level. There is also a drawback that the metal material 6 that has been processed may be hindered from being carried out by being lowered by a distance d which is slightly smaller than 17.

Incidentally, as a technique for supplying the liquid 12 for lubrication and cooling to the forging die, for example, an invention disclosed in Japanese Patent Laid-Open No. 59-82133 has been devised, but such a technique is used for circulation and cooling. Liquid for cooling is processed material (metal material), die front surface, and
The punch is sprayed and fed from the inside of the die at the same time so as to prevent the seizure of the material to be processed and the fracture of the die, which cannot deal with all the above problems.

The object of the present invention is to solve the problems of the forging die based on the above-mentioned conventional technology, and to solve the problem between the upper surface of the stopper of the ejector and the lower surface of the die when the ejector is fully raised.
Alternatively, it is possible to prevent a gap between the lower surface of the ejector and the upper surface of the knockout pin from being generated, thereby preventing the ejected obstacle of the processed metal material due to the unstable rising height of the ejector, and at the same time, It does not provide an excellent forging die structure that is useful in the field of processing technology application in the metal product manufacturing industry by preventing damage to each contact surface due to the impact caused by the collision between the stopper and the die as it rises. It is what

<Means for Solving the Problems> In order to solve the above-mentioned problems, the structure of the present invention, which is based on the above-mentioned object of claim for utility model registration, has an ejector capable of projecting and retracting in a recess of a die. Is mounted on a knockout pin linked to the ejector, and a liquid conducting hole is formed in the longitudinal direction from the knockout pin to the ejector, and the knockout pin is electrically connected to a liquid feeding device, and the upper side surface of the ejector is further connected. In the forging die structure, a liquid ejection hole for the concave portion of the die is formed, and a stopper is provided on the lower side surface of the ejector so as to abut the die when the ejector rises and restrict the rising height of the die. A recess for fitting a knockout pin is formed on the lower surface of the ejector, and a cushion material is interposed between the knockout pin and the ejector. The technical measures that have been taken are taken.

<Action> Thus, an ejector which can be retractably stored in the recess of the forging die has a recess for inserting a knockout pin formed on the lower surface thereof, and on the upper surface of the knockout pin linked to the lifting device in the recess. The ejector is placed over the cushion material, and the recessed part of the die and the metal material put in by the punch are forged, and then the ejector is lifted together with the knockout pin to process the recessed part of the die. When the metal material is lifted up to a predetermined feed level, the upper surface of the stopper protruding from the lower side surface of the ejector comes into close contact with the lower surface of the die while being shock-absorbed by the cushion material, and at the same time, the cushion material formed by the knockout pin and the ejector. The knockout pin and ejector are kept in close contact with each other due to the elastic compression of the Liquid supplied for lubrication and cooling flows through the knockout pin and the liquid conduction hole of the ejector and is ejected from the liquid ejection hole on the upper side surface of the ejector into the concave portion of the die to lubricate and cool the die. Is.

<Embodiment> An embodiment of the present invention will be described below with reference to FIGS. The same parts as those in the conventional embodiment shown in FIG. 3 and subsequent drawings are designated by the same reference numerals.

1'is a forging die, which forms the center of the invention, in which the work from the introduction of the metal material 6 as the work material to the carry-out of the processed metal material 6 is continuously performed, during which lubrication and cooling are performed. The liquid 12 is used to lubricate the concave portion 3 of the die 2 and promote cooling.

Thus, a guide hole 18 is vertically formed in the central portion of the lower base block 10, and a knockout pin 4 linked to an elevator device (not shown) is fitted in the guide hole 18 so as to be vertically swingable. The knockout pin 4 has an upper portion formed in a diameter-reduced shape to form a liquid conducting hole 8 therein, and a guide hole 18 is formed in the guide hole 18 via a communication hole 19 formed in the side surface of the diameter-reduced portion. The space 20 having a ring-shaped cross section and the liquid conducting hole 8 communicate with each other.

Then, a pressure plate having a predetermined thickness is formed on the upper surface of the base block 10.
21 is installed, the upper portion of the knockout pin 4 is vertically slidably inserted into the pressure plate 21, and further, the base block 10 is formed with a conduction hole 11 on one side from the central space 20. A supply device for a liquid 12 for lubrication and cooling (not shown) and the space 20 are connected to each other through the communication hole 11.

Further, in order to fix the fixed block 22 installed on the base block 10, the fixed block 22 is bolted to the base block 10, and a guide hole 23 is provided at the center of the fixed block 22.
Is formed and an ejector 5'is fitted therein, and the die 2 is fixed to the upper portion of the ejector 5'through a clamp block 24. The fixed block 22 has an upper portion to which a pair of liquid discharge holes 25 communicating with the guide holes 23 are connected. , 25 are laterally formed.

Thus, the ejector 5'is formed in a columnar shape so that the upper surface thereof seals the inner bottom surface of the concave portion 3 of the die 2 so as to be flush with the lowermost part of the knockout pin 4 at the center of the lower side thereof. A liquid conducting hole 9 communicating with the liquid conducting hole 8 is formed, and the liquid conducting hole 9 is communicated with the outside through a predetermined number of liquid ejection holes 13, 13 ... .

A recess 26 is formed in the center of the lower surface of the ejector 5 ',
The upper end portion of the knockout pin 4 is fitted in the recess 26 with a ring-shaped urethane rubber 27 as a cushioning material interposed therebetween, and a flange-shaped stopper 14 having a predetermined thickness is projected on the lower outer periphery of the ejector 5 '. It is set up.

The thickness of the stopper 14 is set so that when the knockout pin 4 reaches the upper stroke end, the stopper 14 comes into contact with the lower surface of the die 2 while compressing the urethane rubber 27 together with the knockout pin 4. .

A punch 7 is integrally held by the upper ram 28, and when the metal material 6 is put into the concave portion 3 of the die 2, the ram 28 is held.
It descends together with 28 and presses the metal material 6 in the recess 3 to cast it into a set shape.
A carrying-out device (not shown) is installed on the side of the metal material 6 when the processed metal material 6 is lifted up to a predetermined feed level 17 shown in FIG. 2 through the ejector 5 '. The material 6 is carried out to the outside of the die 2 in a predetermined manner.

In the above configuration, when the metal material 6 is inserted into the die 2, the knockout pin 4 is kept in a standby state by a brake device (not shown), and in this state, the metal material 6 is placed on the upper surface of the ejector 5 '. At the same time, the metal material 6 is forged into a predetermined shape while being pushed down to the lowest position shown in FIG.

Subsequently, the punch 7 is raised together with the ram 28, the knockout pin 4 is raised by the driving of an elevating device (not shown), and the ejector 5'mounted on the upper surface of the knockout pin 4 via the urethane rubber 27 is also raised. Then, as shown in FIG. 2, the metal material 6 forged by the recess 3 of the die 2 is pushed up by the ejector 5 '.

The ejector 5'and the knockout pin 4 continue to rise until the lifting device reaches the upper stroke end, and when the stroke end is reached, the upper surface of the stopper 14 of the ejector 5'contacts the lower surface of the die 2.

At this time, the ejector 5'is attached to the knockout pin 4 on the lower side.
Since the stress is continuously applied from the above, a slight impact occurs when the upper surface of the stopper 14 and the lower surface of the die 2 come into contact with each other, but most of the impact is interposed between the knockout pin 4 and the ejector 5 '. It is absorbed by the elasticity of urethane rubber 27.

Thus, the lower surface of the metal material 6 (forged metal material) pushed up from below by the ejector 5 ′ has a feed level when the lifting device reaches the stroke end.
The forging-forming metal material 6 is carried out to the outside of the die 2 by operating a carrying-out device (not shown).

When the ejector 5'starts to project upward from the recess 3 of the die 2, the lubricating / cooling liquid 12 fed from the feeding device (not shown) flows through the conduction hole 11 and the liquid conduction holes 8 and 9. Are ejected from the respective liquid ejection holes 13 of the ejector 5'to the recess 3 of the die 2, and the recess 3 is lubricated and cooled for the next forging.

At this time, at the abutting portion between the knockout pin 4 and the ejector 5 ', the ejector 5'is fitted in the recess 26 and the sealing action of the urethane rubber 27 irrespective of the supply pressure of the liquid 12. The liquid 12 is securely sealed, and the liquid 12 from the abutting portion between the knockout pin 4 and the ejector 5'is
Therefore, the injection pressure of the liquid 12 from each ejection hole 13 does not decrease, and the granules 12 are sufficiently ejected to the concave portion 3 of the die 2.

Next, the metal material 6 is again put on the upper surface of the knockout pin 4 in a state where the posture is maintained by the brake device, and the ejector 5 jets descend as the punch 7 descends.
The liquid material 12 injected into the concave portion 3 of the die 2 flows down along the outer surface of the ejector 5'due to the pressure applied by the metal material 6 into which the liquid 12 is introduced and the weight of the metal material 6, and finally the liquid discharge hole 25.
Emitted from.

The embodiment of the present invention is not limited to the above embodiment, and various other embodiments can be adopted.

<Effect of the Invention> As described above, according to the present invention, in the forging die structure in which the die and the punch opposed to the die cooperate with each other, the ejector is basically lifted so that the stopper and the die provided on the ejector are in contact with each other. An excellent effect is obtained in that the shock generated when they come into contact with each other can be absorbed by the cushion material interposed between the knockout pin and the ejector to prevent the stopper surface and the die surface from being damaged or damaged.

Further, since the knockout pin and the ejector are securely fitted to each other by the fitting in the recess of the ejector and the cushioning material interposed therebetween, the liquid flowing through the inside of the knockout pin and the ejector is surely sealed. The leakage of the liquid will not occur regardless of the supply pressure of
Therefore, the drop of the injection pressure is surely prevented.

Also, when the ejector rises up to its stroke end, it is clamped between the die and cushion material and fixed in position, so forging is almost independent of the magnitude of the supply pressure of the liquid flowing through the inside of the knockout pin and the ejector. It becomes possible to always lift the formed metal material to the feed level, and as a result, there is an excellent effect that the carry-out failure due to the decrease in the feed level of the forged metal material is eliminated.

[Brief description of drawings]

FIGS. 1 and 2 show one embodiment of the present invention. FIG. 1 is a vertical cross-sectional view during forging, FIG. 2 is a vertical cross-sectional view during unloading, and FIGS. FIG. 3 is a longitudinal sectional view, and FIGS. 4 and 5 are longitudinal sectional views of a main part. 2 ... Dice, 3 ... Recess, 5 '... Ejector, 4 ...
… Knockout pin, 8, 9 …… Liquid conducting hole, 13 …… Liquid ejection hole, 14 …… Stopper, 1 ′ …… Forging die, 26 …… Recess, 27 …… Cushion material

Claims (1)

[Scope of utility model registration request] 1. An ejector (5 '), which is retractable and retractable with respect to a recess (3) of a die (2), is mounted on a knockout pin (4) linked to an elevating device, and the knockout pin (4). 4) to the ejector (5 '), a liquid conducting hole (8, 9) is formed in the longitudinal direction, the knockout pin (4) is conductively connected to the liquid feeding device, and the upper side surface of the ejector (5') is further connected. In the recess (3) of the die (2)
A liquid ejection hole (13) is formed against the stopper (14) that abuts against the die (2) when the ejector (5 ') is lifted on the lower side surface of the ejector (5') and regulates its rising height. ) Is projectingly formed, a recess (26) for fitting the knockout pin (4) is formed on the lower surface of the ejector (5 '), and the knockout pin (4) and the ejector (4) are formed. A forging die (1 ') structure characterized in that a cushion material (27) is interposed between 5').