JPS5847928B2 - Knockout device in forging machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a knockout device that reliably and smoothly removes a molded product forged by a forging machine from an upper mold when opening the mold without damaging the molded product or the mold.

More specifically, a knockout arm extending horizontally on the upper die is provided so that its upward movement is restricted, and this arm is equipped with a knockout pin that is stored in the upper die at the upward movement position of the arm, and the upper die after molding is A regulating member is installed on the lower mold side, etc., to restrict the upward movement of the knockout arm at the beginning of the upward movement of the mold, and release the restriction after the specified upward movement. The upper mold is moved upward while the pressure is restrained, and the molded product is removed from the upper mold while remaining in the lower mold.The upper mold and the knockout pin provided thereon are provided with a delay operation, and the molded product is removed from the upper mold. The present invention relates to a knockout device for a forging machine that ensures reliable and smooth removal of the molded product and prevents damage to the molded product or die.

In a forging machine, the upper die is moved up and down using a crank motion, but the knockout device uses the power of the upper die's up and down movement to protrude a knockout pin from the top of the upper die using a combination of cams, levers, etc. removal from the mold,
In other words, a knockout is performed.

Such a crank type forging machine has 36 crank rotations.
To complete the l cycle by moving the upper mold up and down at 0°,
The 18,000 rotation position is the bottom dead center of the upper mold, and at this bottom dead center position, the upper and lower molds are brought together and the product is shaped.

By the way, in general, the knockout timing of a molded product after forging must be set so that the knockout timing is performed at a position deviated from the bottom dead center by a required angle, for example, 500 degrees.

The reason for this is that in a forging machine of about 1000 tons, when the upper and lower dies are combined for forming, if the lower die is made rigid, the upper die will elongate by about 2 to 3 mm.

That is, the upper mold becomes thinner. Therefore, if the knockout timing is set at the bottom dead center position of 180 degrees when the upper die is lowered, the knockout pin will protrude from the lower end surface by the amount of extension of the upper die, and the tip of the knockout pin will come into contact with the molded product during molding.
This may cause damage or other inconvenience.

For this reason, the knockout timing by the knockout pin has to be shifted as described above.

However, the conventional means for shifting the knockout timing has the following problems.

In other words, if the forged product has a complicated shape for both the upper and lower dies,
Alternatively, if the upper mold has a complicated shape, a phenomenon in which the shaped article adheres to the mold and does not separate from it, a so-called clinging phenomenon, occurs.

For this reason, the molded product may be pulled by the upper and lower molds and deformed, or it may rise while clinging to the upper mold, and if it is knocked out above, the molded product will fall onto the lower mold, causing mold damage or deformation of the molded product. , causing damage.

Therefore, as a countermeasure to the above problem, the draft angle of the molded product is increased to prevent it from clinging to the mold.
According to this method, machining is required after shaping, and since a large draft angle is provided, the amount of cutting becomes extremely large, making machining extremely difficult, resulting in poor workability and increased man-hours, which are undesirable.

The present inventors have devised the present invention in order to effectively solve the above-mentioned problems of knockout devices in forging machines.

The object of the present invention is that even when a molded product with a complex shape is forged or shaped in a manner that maintains accuracy and eliminates post-processes such as machining, or minimizes the number of post-processes such as machining, the molded product remains intact. Non-knockout is performed at a time when the mold does not cling to the upper mold, without damaging or deforming the molded product.
Furthermore, the present invention provides a knockout device for a forging machine that can perform knockout smoothly and reliably without causing damage to the die.

Another object of the present invention is to provide a knockout device for a forging machine that has a simple structure and can accurately and reliably perform the above operations in synchronization with the lifting of the upper mold.

In order to achieve the above object, the present invention provides a knockout arm extending horizontally on the upper die so that its upward movement is regulated, and this arm has a non-knockout pin that is stored in the upper die at the upward movement position of the arm. When the upper die moves up after molding, a delay operation is provided between this timing and the upward movement timing of the knockout pin, leaving only the knockout pin in the lower moving position, and the upper die is moved while the molded product remains on the lower die. The knockout pin is then raised together with the upper die.

Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

This will reveal further objects and advantages of the invention.

The drawing is a longitudinal sectional view of a knockout device according to the invention.

Reference numeral 1 denotes a forging machine, which consists of a lower die 3 which is a fixed die and an upper die 2 which is a movable die.

Molding grooves 4 and 5 are provided in the mold mating surfaces 2a and 3a of each mold 2 and 3, respectively, the lower mold 3 is fixed to a fixed stand (not shown), and the upper mold 2 is connected to a movable stand (not shown), etc. The figure shows the upper die at the bottom dead center position.

A hollow space 6 is provided in the lower part of the upper mold 2 to pass horizontally through the space, and a knockout arm 7 is inserted into this space 6 so as to pass through it. Protrude laterally from both sides of this portion by an appropriate length.

The height of the cavity 6 is set to be sufficiently larger than the height of the arm 7, and the receiving recess 7b provided on the lower surface of the arm 7 and the lower wall 6 of the cavity 6
A spring 8 is compressed between the receiving recesses 6b provided at a, and the arm 7 is constantly pressed upward.

The upper surface 7c of the arm 7 comes into elastic contact with the upper wall 6c of the space 6, and the reference numeral 9 in the figure is a spring guide.

Thus, a predetermined clearance S is maintained between the lower wall 6a of the cavity 6 and the lower surface of the knockout arm 7 under normal conditions.

Two knockout pins io and io are installed hanging from this knockout arm 7, and the pins 10 and 10 are passed vertically so as to connect between the cavity 6 at the bottom of the upper mold 2 and the molding groove 4 on the molding surface. It is inserted into the through holes 2b, 2b, and its lower end faces the surface of the molding groove 4.

These pins 10, 10 are connected to the upper large diameter portion 2 of the through holes 2b, 2b.
It is elastically biased upward by a spring 11 compressed between the root canine diameter portion 10a and the root canine diameter portion 10a.

On the other hand, hooks 12, 12, which are means for regulating the knockout arm, are arranged symmetrically on both sides of the lower die 3, which is a fixed type, and the hooks 12, 12 are attached to the bracket 14 on the lower die side by a pin 13 at the base. They are pivotally supported so as to be able to swing freely, and are each pressed in a direction toward the side surface of the upper mold by a spring 15, and their swinging position toward the side surface of the mold is regulated by an adjustment screw 16.

At the upper end of each hook 12, a claw 17 for locking both ends 7a, 7a of the knockout arm 7 is provided at a portion facing the side surface of the mold.
are provided respectively, and a guide pin 18 is provided below the claw 17.

On the other hand, a portion 2d extending to the side of the cavity 6 at the lower part of the upper mold 2
, 2d are provided with cams 19, each of which has a symmetrical shape, and the cam profile of the cam 19 is provided in the vertical direction of each outer edge.

The cam profile has a vertical portion 19a at the top and a bulge 19c at the middle, which are connected by an oblique side 19b, and the lower end of the intermediate bulge 19c has an oblique side 19d inclined toward the side surface of the mold.

This cam profile is arranged symmetrically for the left and right cams.

Next, to explain its operation, the figure shows a state in which forging is completed, the molded product W is forged between the molding grooves 4 and 5 of the upper and lower dies 2 and 3, and the lower ends of the knockout pins 10 and 10 are It is in contact with or extremely close to the top surface of the shaped product W.

When the upper mold 2 is raised, the molding surface 2a and the molding part 4 are raised to the lower mold 3.
However, since both ends 17a of the knockout arm 7 are engaged with the claws 17 of the hook 12, the upward movement of the arm 7 is prevented, and the spring 8
, 11 are contracted, the clearance S of the space 6 is gradually narrowed, and the knockout pin 10 integrated with the knockout arm 7 is maintained in a pressed state on the molded product W.

Therefore, despite the upward movement of the upper die 2, the knockout pin 1
0 is left behind, and the molded product W is knocked out or peeled off from the molding surface 2a of the upper mold 2 and the molding section 4, and is left on the molding surface 3a of the lower mold 3 and the molding section 5.

As the upper mold 2 rises, the cam 19 also rises together, and at the beginning of this rise, the guide pin 18 is attached to the vertical part 19a of the cam 19.
The claws 17 of the hook 12 maintain engagement with both ends 7a of the knockout arm 7 while being guided by the claws 17 of the hook 12.

When the upper die 2 rises to a predetermined height, the oblique side 19 of the cam 19
b collides with the guide pin 18, and the guide pin 18 is pushed outward by the action of the oblique side 19b, that is, the hook 12 is pushed outward.

As a result, the hook 12 on the left side swings counterclockwise in the figure, and the hook 12 on the right side swings clockwise in the figure, using the pin 13 as a fulcrum, the claw 17 moves in the opening direction, and the claw 17 and both ends of the knockout arm swing. The engagement with the portion 7a is released.

Therefore, the arm 7 is moved into the empty space 6 by the action of the springs 9 and 11.
The knockout pin 10 moves upward to a position where the upper surface 7c abuts against the upper wall 6c of the mold, and the knockout pin 10 moves upward accordingly to release the suppression of the preform and is stored in the upper mold 2 as shown in the figure.

As the upper mold 2 continues to rise, the guide pin 18 reaches the oblique side 19d of the cam 19 and abuts against the adjustment screw 16, thereby maintaining the state shown in the figure.

On the other hand, when the upper die 2 is lowered, the lower oblique side 19 of the cam 19 is attached to the guide pin 18 of the hook 12 which is closed and in the illustrated position.
d enters and is engaged with it to expand and swing outward, and at the bottom dead center of the upper mold 2, the guide pin 18 reaches the vertical part 19a via the oblique side 19b of the cam, and the claw 17 moves the knockout arm. 7
Lock both ends.

Repeat the above.

In the example shown above, the regulating member is a swinging hook, and the cam provided on the upper die is used to open and close the regulating member in the left-right direction, but this mechanism can be modified as appropriate.

As is clear from the above, according to the present invention, since the knockout pin is operated in a delayed manner so as to temporarily leave the knockout pin when the upper mold is raised, the molded product is prevented from being knocked out and clinging to the mold at the same time as the upper mold is raised, and the molded product is prevented from clinging to the mold. Knockout can be performed accurately and reliably without causing the product to be pulled by the upper and lower molds and deformed, to fall onto the lower mold midway and be damaged, or to damage the lower mold.

As a result, it is possible to perform highly accurate forming of complex shapes with no or very little post-processing in the forged form, improving workability, omitting processes, and achieving efficient forging. It became.

Furthermore, the present invention opens and closes the hook, which is a regulating member, using a cam or the like as the upper mold moves up and down, and delays the movement of the knockout arm. Therefore, the structure is relatively simple, and accurate and reliable operation can be ensured.

[Brief explanation of drawings]

The drawing is a longitudinal sectional view showing an embodiment of the present invention. In the drawings, 1 is a forging machine, 2 is an upper die, 3 is a lower die, 7 is a knockout arm, 10 is a knockout pin, 12 is a regulating member, 9 and 11 are elastic means, and W is a molded product.

Claims (1)

[Claims] 1. A knockout arm consisting of a non-knockout pin fixedly hanging down is provided in the upper mold that moves up and down, extending horizontally so as to be movable up and down, and a spring for holding the knockout arm at the upper limit of movement. A member is interposed between the lower part of the knockout arm and the upper mold, and a cam is provided on the side of the upper mold, while the lower mold side, which is a fixed mold, is provided with a cam at the lower limit of the upper mold. engaging with both ends respectively to prevent the upward movement of the knockout arm when the upper mold starts to rise;
A knockout device for a forging machine, further comprising a regulating member that releases the engagement and delays the upward movement of the knockout arm when pressed by the cam during the upward movement of the upper die.