JP2005219114A - Powder compacting press apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the cost of a driving system, to suppress the cost of an apparatus main body and the running cost to be inexpensive and, furthermore, to shorten a setting up time. <P>SOLUTION: In a powder compacting press apparatus 10 which is provided with a die 11 which is supported vertically, movably and on which charging part is formed, an upper punch 12 and a lower punch 13 which are supported movably back and forth toward the charging part A of the die 11 and a lower ram 20 with which the die 11 is moved up and down, and in which desired compacted parts are formed by compressing the compacting powder with the lower punch 13 and the upper punch 12 in the inside of the die 11 when the compacting powder P is charged in the charging part A, this apparatus is provided with a first driving system for driving a die including the upper punch 12, a second driving system for driving a die including the die 11 and the second driving system is provided with a driving part 25 for upward energizing the die 11 and a hydraulic cylinder 40 which has higher output than the driving part 25 for positioning the die 11. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a powder molding press device, and more particularly, to a powder molding press device using a withdrawal system.

In a conventional powder molding press apparatus, a die that is supported so as to be movable up and down and has a filling portion that is filled with molding powder, an upper punch that is supported so as to be able to advance and retreat toward the filling portion of the die, A lower punch that is attached so as to be movable relative to the filling portion and defines the filling portion together with the die, and a lower ram that moves the die up and down, and when the molding powder is filled in the filling portion, There is known a powder molding press apparatus in which a molding powder is compressed by the lower punch and the upper punch to form a desired molded product in the die.
In such a powder molding press apparatus, when molding a powder molded product, first, in the filling step, the die is arranged at a predetermined position, and the filling portion where the die is formed is filled with the molding powder.
In the first pressurizing step after the filling step, the upper punch presses the upper surface of the molded powder toward the filling portion.
In the second pressurizing step after the first pressurizing step, the die and the upper punch descend in synchronization. When the upper punch and the die are lowered synchronously, the lower punch is relatively lifted, and the lower surface of the molding powder is pressed by the lower punch.
In the third pressurizing step after the second pressurizing step, the die stops descending and is placed at a fixed position, while the upper punch presses the upper surface of the molding powder and powder molding is performed at the filling portion. The product is molded.
In the extraction step, the upper punch is raised and the die is lowered, and the powder molded product is extracted from the filling portion.

  As such a powder molding press device, the upper punch, the lower punch, and the mechanical powder molding press device that drives the die by a mechanical drive system, and the upper punch is operated mechanically, while the upper punch is operated. Accordingly, there are provided a so-called hybrid type powder molding press apparatus that controls the die by hydraulic CNC control, and a hydraulic powder molding press apparatus that drives both the upper punch and the die by a hydraulic drive system.

Among these powder molding press devices, for example, in a hydraulic powder molding press device that controls both the upper punch and the die, the hydraulic cylinder that drives the die has a high output capacity (see Patent Document 1 below). ).
In other words, in the second pressurizing step, friction is generated between the molding powder pressed by the lower punch and the die, and the die needs to operate overcoming this friction. Therefore, the hydraulic cylinder that drives the die This is because the output needs to be high.
Further, when the step portion is formed in the filling portion of the die, the hydraulic cylinder that drives the die needs to support the pressure applied to the die from the upper punch in the third pressurizing step. This is because the capacity needs to be high (for example, 16000 KN).
Further, in the extraction process, a large friction is generated between the powder molded product and the die, and the hydraulic cylinder that drives the die needs to overcome the friction and drive the die. This is because the cylinder needs to have a high output (for example, 15000 KN).
In addition, when the die is driven by a hydraulic cylinder, the output of the hydraulic cylinder cannot be adjusted for each series of processes, and the output capacity of the hydraulic cylinder needs to be set according to the process that requires the most output. Therefore, the hydraulic cylinder for driving the die needs to have a high output capacity.
JP-A-7-115233

By the way, in the conventional hydraulic powder molding press apparatus, the hydraulic cylinder that drives the die as described above needs to have a high output, so that the drive system that drives the die becomes expensive. There is a problem that the cost of the powder molding press main body is increased.
Further, since the hydraulic cylinder for driving the die has a high output, it is necessary to supply a large amount of electric power for driving, and the running cost of the apparatus is increased.
Furthermore, in the conventional hybrid type powder press apparatus, the upper punch is driven mechanically, but the die is driven in the same structure as the conventional hydraulic powder press apparatus. The hydraulic cylinder for driving the die, like the device, has a high output, and therefore, it is necessary to supply a large amount of electric power or the like for driving, and the running cost of the device is increased.
In addition, the hybrid type powder press machine that drives the upper punch with a mechanical type and uses a servo motor to drive the die similarly needs the servo motor that drives the die to have a high output and drives the die. There is a problem that the driving system to be operated is expensive, the cost of the powder molding press apparatus main body is increased, a large amount of electric power is required to be driven, and the running cost of the apparatus is also increased.
In conventional mechanical powder molding presses, when mounting the die, lower punch and upper punch, all are screw-adjustable, so there is a problem that it takes time to set up. There are problems that it is difficult to adjust and it is difficult to form a high-precision powder molded product, and it is difficult to adjust the speed of the die operation during molding, so the molding method is changed according to the shape of the powder molded product There was a problem that it was difficult.

  The present invention has been made in consideration of such circumstances, and the object thereof is to reduce the cost of the drive system, to suppress the cost of the apparatus main body and the running cost to be low, and Another object of the present invention is to provide a powder molding press apparatus that can shorten the setup and facilitate the speed adjustment of the die operation.

In order to achieve the above object, the present invention proposes the following means.
According to the first aspect of the present invention, there is provided a die that is supported so as to be movable up and down and has a filling portion that is filled with a molding powder, an upper punch that is supported so as to be able to advance and retreat toward the filling portion of the die, and the die. A lower punch that is attached to the filling portion so as to be movable relative to the filling portion and defines the filling portion together with the die, and a lower ram that moves the die up and down, and when the filling portion is filled with molding powder In the powder molding press apparatus for forming a desired molded product by compressing the molding powder with the lower punch and the upper punch in the die, a first drive system for driving the mold including the upper punch And a second drive system for driving a mold including the die, the second drive system having a drive unit that presses the die upward and a higher output than the drive unit. Hydraulic cylinder for positioning the die The lower ram is supported below the lower ram, the upper punch is lowered, and the molded powder in the filling portion is compressed by the upper punch to form the molded product. A pressure receiving portion for supporting the pressing force of the upper punch received by the die through the molding powder is provided.

  According to the powder molding press apparatus according to the present invention, in the filling process, the hydraulic cylinder positions the die, the drive unit displaces the die to the positioned position, and in the second pressurizing process. Then, the hydraulic cylinder displaces the die downward against the urging force of the drive unit and performs positioning. And in a 3rd pressurization process, when a powder molded product is shape | molded, a pressure receiving part supports the pressing force which a die | dye receives from an upper punch by supporting a lower ram.

  According to a second aspect of the present invention, in the powder molding press device according to the first aspect, in the extraction step of driving by the first drive system and extracting the molded product from the filling portion, The present invention is characterized in that an unloading mechanism is provided for further downward from the position when the molded product is formed.

  According to the powder molding press device of the present invention, in the extraction process, the detaching mechanism releases the support state between the pressure receiving portion and the lower ram, and the detaching mechanism further lowers the ram. A powder molded product is extracted from the part.

  According to the present invention, the drive system can be reduced in cost, the cost of the apparatus main body and the running cost can be kept low, and the setup can be shortened and the speed of the die operation can be easily adjusted. can do.

Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 show a powder molding press apparatus according to an embodiment of the present invention.
A powder molding press apparatus 10 according to this embodiment shown in FIG. 1 includes an apparatus main body 10a, a die set 10b mounted on the apparatus main body 10a, an upper punch 12, and a lower punch 13.
The apparatus main body 10a includes an upper ram 30 that moves the upper punch 12 up and down, a support plate 14 into which the upper ram 30 is inserted, a lower ram 20, a lower ram plate 22 provided on the lower ram 20, and a lower ram. A pneumatic cylinder 25 that presses the plate 22 upward from below, a hydraulic cylinder 40 that positions the lower ram plate 22, a stopper plate 26 that supports the lower end of the lower ram 20, and the stopper plate 26 in the lateral direction And an unloading mechanism 23 to be slid.
The die set 10 b is fixed to the apparatus main body 10 a and has a lower punch plate 17 on which the lower punch 12 is mounted, a die 11 disposed above the lower punch plate 17 and formed with a filling portion A, and disposed above the die 11. The punch mounting plate 31 on which the upper punch 12 is mounted, the guide 32 for guiding the punch mounting plate 31, and the sliding plate 18 a for fixing the lower ram 20 and moving the die 10 up and down via the rod 18. ing.
The upper end of the lower ram 20 is fixed to the lower surface of the sliding plate 18a by a T-shaped joint 18b.
The lower end of the upper ram 30 is fixed to the punch mounting plate 31 by a T-shaped joint 31a.

The die 11 is supported by a lower ram 20 through a sliding plate 18a and a rod 18 so that the die 11 can move up and down.
A lower ram plate 22 is integrally fixed at an intermediate position in the height (length) direction of the lower ram 20.
The second drive system 35 that drives the die 11 includes a pneumatic cylinder 25 and a hydraulic cylinder 40.
The pneumatic cylinder (driving unit) 25 includes a piston rod 24 a and a cylinder unit 24 b, and the pneumatic cylinder 25 is disposed on the lower surface side of the lower ram plate 22.
An upper end portion of the piston rod 24a is fixed to the lower ram plate 22, and presses the lower ram plate 22 upward.
For this reason, the die 11 is urged upward by the pneumatic cylinder 25.

The hydraulic cylinder 40 is composed of a piston rod 41 a and a cylinder part 41 b, and has an output larger than the output of the pneumatic cylinder 25.
The position of the tip end portion of the piston rod 41a is controlled by a processing apparatus B configured by a control unit and a storage unit.
Further, the tip of the piston rod 41a is not fixed to the lower ram plate 22, and is disposed so as to be separated.
The hydraulic cylinder 40 is disposed on the upper surface side of the lower ram plate 22, and is fixed to the wall portion of the apparatus main body 10a.

The upper punch 12 is attached to the tip of the upper ram 30 via the support plate 14 and the punch mounting plate 31. A guide 32 erected on the upper surface of the die 11 is inserted through a hole formed in the support plate 14 and the punch mounting plate 31. When the upper punch 12 and the die 11 are moved, the die 11 is guided to the upper punch 12 by the guide 32 so that the position is not displaced.
The upper punch 12 is driven by a mechanical first drive system (not shown) via a mechanical crank mechanism.
The first drive system drives the punch mounting plate 31, the upper punch 12 fixed to the punch mounting plate 31, and the hooking mechanism 23.

  The lower punch 13 is erected on a lower punch plate 17 attached to the first wall 16 of the apparatus main body 10a, and an upper portion thereof is provided in the filling portion A of the die 11 so as to be relatively movable, so that the die 11 is used to define the filling portion A. Therefore, the rod 18 provided at the lower part of the die 11 is inserted through a hole formed in the lower punch plate 17.

The stopper plate (pressure receiving portion) 26 is used to insert the lower ram 20 and lower the die 11 when it is displaced in the horizontal direction by the fork 23a of the unloading mechanism 23 when the molded product S shown in FIG. A shift hole 28 of a size that allows the fork 23 to enter is provided, a roller portion 27 is provided at a side portion of the shift hole 28, and an insertion portion 29 for inserting the lower ram 20 is further provided at the center portion. Is provided.
Further, the stopper plate 26 is provided at two locations below the lower ram 20 so as to face each other.

The detaching mechanism 23 includes a fork 23 a inserted through a hole formed in the lower ram plate 22 and a pressing portion 23 b formed to protrude from the fork 23 a on the upper surface of the lower ram plate 22.
The unloading mechanism 23 is connected to a first drive system (not shown) via a mechanical cam and a lever mechanism.

As shown in FIG. 1, in the filling process, the piston rod 41a of the hydraulic cylinder 40 is displaced upward and stops at a predetermined position.
When the piston rod 41a is displaced upward, the lower ram plate 22 is biased upward by the pneumatic cylinder 25, so that it is displaced upward and stops at a position positioned by the tip of the piston rod 41a.
When the lower ram plate 22 is displaced upward, the die 11 is also displaced upward and stops at the filling position.
When the die 11 stops at the filling position, the filling part A has a volume sufficient to fill the molding powder P, and the filling part A is filled with the molding powder P.

In the first pressurizing step after the filling step, as shown in FIG. 2, the upper punch 12 descends toward the filling portion A and presses the upper surface of the molding powder P.
After the upper punch 12 presses the upper surface of the molding powder P, as shown in FIG. 3, in the second pressurizing step, the piston rod 41 a of the hydraulic cylinder 40 presses the upper surface of the lower ram plate 22.
Since the output of the hydraulic cylinder 40 is larger than the output of the pneumatic cylinder 25, the pressing force of the piston rod 41a is larger than the pressing force of the pneumatic cylinder 25, and the lower ram plate 22 is displaced downward.
At this time, the processing apparatus B controls the movement of the hydraulic cylinder 40 so that the die 11 and the upper punch 12 are lowered in proportion to the lowering speed of the upper punch 12.
When the die 11 and the upper punch 12 are synchronized or descend in proportion to the descending speed of the upper punch 12, the lower punch 13 is relatively displaced upward, and the lower punch 13 moves the lower surface of the molding powder P down. Press.

When the die 11 is lowered and positioned at a predetermined position, the lower ram 20 connected to the die 11 contacts the stopper plate 26 as shown in FIG.
The position of the die 11 is fixed when the lower ram 20 abuts against the stopper plate 26.
In the third pressurizing step, the die 11 is positioned at a fixed position, while the upper punch 12 is further lowered to press the upper surface of the molding powder P.
When the upper punch 12 presses the upper surface of the molding powder P, an excessive load is applied to the die 11.
That is, when the upper punch 12 presses the molding powder P in the filling portion A, the pressing force by which the molding powder P presses the inner surface of the filling portion A increases, and between the molding powder P and the inner surface of the filling portion A, A large frictional force acts, and the pressing force of the upper punch 12 acts on the die 11 through the molding powder P.
For this reason, in the third pressurizing step, an excessive load is applied to the die 11 when the upper punch 12 presses the molding powder P.
In particular, when a step portion is formed on the die 11, the die 11 receives an excessive load because the pressing force from the upper punch 12 is directly applied to the die 11.
Thus, the load applied to the die 11 is supported by the stopper plate 26 via the lower ram 20. When the upper punch 12 is located at the bottom dead center, the powder molded product S is formed in the filling portion A.

In the extraction process of the powder molded product S, as shown in FIG. 5, the pressing portion 23b of the detaching mechanism 23 that moves up and down by the first drive system presses the upper surface of the lower ram plate 22, and the fork 23a. Presses the roller portion 27 of the stopper plate 26 to displace each stopper plate 26 in the horizontal direction.
When the fork 23a displaces each stopper plate 26 in the horizontal direction, an insertion portion 29 having an enlarged diameter is formed between the stopper plates 26.
Then, as shown in FIG. 6, when the pressing portion 23 b presses the upper surface of the lower ram plate 22, the lower ram 20 is inserted into the insertion portion 29 whose diameter has been increased.
By inserting the lower ram 20 into the insertion portion 29 having an enlarged diameter, the die 11 is further displaced downward, and the lower punch 13 is displaced relatively upward, and the powder molded product S is filled. Part A is extracted.

  When the extraction step is completed, the piston rod 41a of the hydraulic cylinder 40 is displaced upward, and the hooking mechanism 23 is also displaced upward. For this reason, the lower ram plate 22 is released from being pressed by the pressing portion 23b, and is displaced upward by the pneumatic cylinder 25, and the filling process is performed.

According to this powder molding press apparatus 10, in the third pressurizing step in which an excessive load is applied to the die 11, the stopper plate 26 supports the die 11 via the lower ram 20, and the pneumatic cylinder 25 and The hydraulic cylinder 40 does not need to support the die 11.
For this reason, the output of the pneumatic cylinder 25 and the hydraulic cylinder 40 does not need to be set to the output required to support the die 11 in the third pressurizing step, and can be a low output.
Further, in the extracting step, the die 11 is displaced by the unloading mechanism 23 driven by the first drive system, and the hydraulic cylinder 40 and the pneumatic cylinder 25 do not need to displace the die 11.
For this reason, the output of the pneumatic cylinder 25 and the hydraulic cylinder 40 does not need to be set to the output required to displace the die 11 in the extraction process, and can be a low output.

In other words, the pneumatic cylinder 25 only needs to have an output for displacing the die 11 that has not received the load from the upper punch 12 in the filling process, and has a low output (for example, 31 kN). Can do.
Further, the hydraulic cylinder 40 only needs to have an output sufficient to overcome the friction generated between the molding powder P and the filling portion A in the second pressurizing step, and has a predetermined output (for example, 160 KN). Can be.

  Thus, since both the hydraulic cylinder 40 and the pneumatic cylinder 25 can be a low output hydraulic cylinder and pneumatic cylinder, the cost and running cost of the second drive system 35 and the powder molding press apparatus 10 can be reduced. It can be inexpensive.

Further, since the movement of the hydraulic cylinder 40 is controlled by the processing device B, the movement and speed of the die 11 can be controlled with high accuracy, and the filling position in the filling process can be set accurately. .
In addition, by storing the position of the die 11 in the storage unit of the processing apparatus B, various molding conditions can be called in a short time, so that the setup time can be shortened.

  Compared with the conventional powder molding press apparatus, this powder molding press apparatus 10 is capable of high accuracy, shortening the setup time, and speed ratio molding because the filling position and the pressurizing process are CNC controlled.

  Moreover, this powder molding press apparatus 10 can achieve energy saving and high speed compared with the conventional hydraulic CNC powder molding press apparatus.

  Further, the powder molding press apparatus 10 can save energy, simplify input parameters (shorten the setup time), and increase the output of the stopper capability as compared with the conventional hybrid powder molding press apparatus.

In the present embodiment, the drive system that drives the die 11 includes the hydraulic cylinder 40 and the pneumatic cylinder 25, but is not limited thereto. For example, both may be constituted by a hydraulic cylinder.
In the present embodiment, the lower punch 13 is fixed to the apparatus main body 10a through the die set 10b, but may be driven by a hydraulic cylinder or the like.

  According to the powder molding press apparatus according to the present invention, the drive system can be reduced in cost, the cost of the apparatus main body and the running cost can be kept low, and the setup can be shortened. As a result, industrial applicability is recognized.

It is explanatory drawing of the operation state in the filling process of the shaping | molding powder of the powder shaping press apparatus which concerns on one embodiment of this invention. It is explanatory drawing which shows a state when the upper surface side of shaping | molding powder is pressurized in a 1st pressurization process. It is explanatory drawing which shows a state when the lower surface of shaping | molding powder is pressurized by the upper punch and die | dye falling in a 2nd pressurization process. It is explanatory drawing which shows a state when the fall of die | dye stops in a 3rd pressurization process, and the upper surface of a shaping | molding powder is pressurized by the upper punch falling. It is a figure when an upper punch is located in a bottom dead center at the end of the 3rd pressurization process. It is explanatory drawing which shows the operation state which shows a state when extracting a molded article in an extraction process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Powder forming press 11 Die 12 Upper punch 13 Lower punch 20 Lower ram 22 Lower ram plate 25 Pneumatic cylinder (drive part)
29 Stopper plate (pressure receiving part)
40 Hydraulic cylinder

Claims (2)

A die that is supported so as to be movable up and down and has a filling portion that fills a molding powder, an upper punch that is supported so as to be able to advance and retreat toward the filling portion of the die, and is movable relative to the filling portion of the die A lower punch that defines the filling portion together with the die, and a lower ram that moves the die up and down,
In the powder molding press apparatus for forming a desired molded product by compressing the molding powder with the lower punch and the upper punch in the die when the molding powder is filled in the filling portion,
A first drive system for driving the mold including the upper punch, and a second drive system for driving the mold including the die;
The second drive system includes a drive unit that presses the die upward, and a hydraulic cylinder that positions the die with a higher output than the drive unit,
Below the lower ram, the lower ram is supported, the upper punch is lowered, and the molded powder in the filling portion is compressed by the upper punch to form the molded product. A powder molding press apparatus, characterized in that a pressure receiving portion that supports the pressing force of the upper punch received by the die is provided. In the powder molding press apparatus according to claim 1,
An unloading mechanism is provided that is driven by the first drive system to pull the die further downward from the position when the molded product is formed in the extracting step of extracting the molded product from the filling portion. A powder molding press device characterized by

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