US20170080492A1 - Powder molding apparatus and compact manufacturing method - Google Patents
Powder molding apparatus and compact manufacturing method Download PDFInfo
- Publication number
- US20170080492A1 US20170080492A1 US15/265,411 US201615265411A US2017080492A1 US 20170080492 A1 US20170080492 A1 US 20170080492A1 US 201615265411 A US201615265411 A US 201615265411A US 2017080492 A1 US2017080492 A1 US 2017080492A1
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- United States
- Prior art keywords
- platen
- compact
- die
- molding apparatus
- actuator
- Prior art date
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- Abandoned
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- 239000000843 powder Substances 0.000 title claims abstract description 64
- 238000000465 moulding Methods 0.000 title claims abstract description 63
- 238000004519 manufacturing process Methods 0.000 title claims description 18
- 238000003825 pressing Methods 0.000 claims description 27
- 210000001503 joint Anatomy 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 14
- 239000002184 metal Substances 0.000 description 6
- 238000005336 cracking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
- B22F3/03—Press-moulding apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
- B30B1/02—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by lever mechanism
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
- B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
- B30B1/02—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by lever mechanism
- B30B1/08—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by lever mechanism operated by fluid-pressure means
Definitions
- the present invention relates to a powder molding apparatus and a compact manufacturing method using the apparatus.
- various types of sintered parts are manufactured by press-molding metal powder into a compact and sintering the compact.
- a powder molding apparatus including a die having a hollow and an upper punch and a lower punch that slide inside the hollow of the die and form a cavity jointly with the hollow, a metal powder body is charged into the cavity and is pressurized by pushing down, for example, the upper punch, whereby a powder compact is manufactured.
- Japanese Patent Application Publication No. 6-188138 discloses a molding apparatus in which when a compact is ejected from a die, the die is pulled down using an actuator provided below the die, and molding apparatuses of this type are in common use.
- JP 6-188138 A requires providing an actuator and a mechanism (e.g., a rod) that connects the actuator and the die below the die, causing a problem in that a position of the die from the ground is often high.
- a mechanism e.g., a rod
- the height of the die needs to be a height that allows an upper surface of the die to be viewed by a worker, and thus, a problem also arises in that it is necessary to dig a pit at a site where a press is to be installed to embed a lower portion of the press under the ground or it is necessary for the worker to stand on a platform and perform work.
- hold-down load the compact is ejected from the die in a state in which the compact is held between the lower punch and the upper punch and a load for the holding the compact in this situation is referred to as “hold-down load”.
- the load cell In order to keep the hold-down load constant, it is necessary to provide a load cell to perform control; however, the load cell needs to withstand not only the hold-down load, but also a molding load, resulting in problems in that the molding apparatus itself tends to large in size and is often expensive.
- the present invention provides a powder molding apparatus that enables a manufactured compact to be ejected easily without the need to make a height of the molding apparatus to be high and the need to dig a pit at a site where a press is to be installed and, and a compact manufacturing method using the apparatus.
- a powder molding apparatus includes: a die having a hollow; an upper punch and a lower punch that slide inside the hollow of the die and form a cavity jointly with an inner wall of the hollow; a middle platen attached to the upper punch; an upper platen attached to a push rod; a press machine that pushes down the upper platen; a link mechanism that connects the upper platen and the middle platen; a first actuator that fixes the link mechanism and cancels the fixation of the link mechanism; a bolster attached to the lower punch; and a lower platen attached to the die, the lower platen being biased upward from the bolster via a spring, and descending of the upper platen and the push rod causes the lower platen and the die to be pushed downward by the push rod, and along with a downward movement of the die, the lower punch makes a upward movement inside the hollow with respect to the die.
- the powder molding apparatus employs the configuration in which the first actuator fixes, and cancels the fixation of, a link mechanism connecting the upper platen attached to the push rod (injection push rod), the push rod pushing down the lower platen equipped with the die, and the middle platen equipped with the upper punch that slides inside the die.
- the link mechanism is fixed by the first actuator, a pressing force from the press machine is transmitted to the upper platen, the pressing force is transmitted to the middle platen via the fixed link mechanism, and the pressing force is then transmitted to the upper punch provided on the middle platen, whereby the powder is press-molded.
- the first actuator cancels the fixation of the link mechanism, and the pressing force from the press machine is transmitted to the upper platen, but the pressing force is not transmitted to the middle platen via the unfixed link mechanism.
- the pressing force transmitted to the upper platen is transmitted to the lower platen equipped with the die by the push rod, whereby the lower platen and the die are pushed down.
- the die being pushed down, the compact molded on the lower punch inside the hollow of the die is exposed above the die, enabling ejection of the compact.
- Examples of the first actuator can include, e.g., an air cylinder mechanism and an oil hydraulic cylinder mechanism.
- examples of the press machine can include a slide and a unit body including an oil hydraulic cylinder or the like and a slide.
- the powder molding apparatus in molding of powder and ejection of a compact, fixation and cancellation of the fixation of a link mechanism are performed, respectively, by the first actuator, enabling the manufactured compact to be easily ejected without the need to make a height of the molding apparatus to be high and the need to dig a pit at a site where the press is installed.
- the link mechanism may include two links and three joints, the three joints connecting the links, the upper platen and the middle platen, respectively, and connecting the two links.
- the first actuator may include an air cylinder and a piston, and a distal end of the piston may be attached to the joint that is a middle joint among the three joints.
- the powder molding apparatus may further include a second actuator between the upper platen and the middle platen.
- the second actuator includes, e.g., an air cylinder mechanism or an oil hydraulic cylinder mechanism.
- the fixation of the link mechanism is cancelled by the first actuator, and a pressing force from the press machine is thus transmitted to the lower platen equipped with the die, via the push rod to push the lower platen and the die down.
- the second actuator is not provided, no pressing force is applied to the upper punch, but because of the provision of the second actuator, the die can be pushed down while the compact being pressed by the second actuator with a pressing force that is smaller than a pressing force applied at the time of the molding.
- a relief valve is provided, enabling a compact to be pressed while a load applied on the upper punch (what is called “hold-down load”) being kept constant by the second actuator, and also a pressing force from the press machine to be transmitted to the lower platen equipped with the die, by the push rod to push the lower platen and the die down, whereby the compact is exposed from the cavity.
- the aspect of the present invention also provides a compact manufacturing method, and the manufacturing method is a compact manufacturing method using the above powder molding apparatus, the method including: charging powder into the cavity; manufacturing a compact by fixing the link mechanism via the first actuator, and pushing down the upper platen, the middle platen and the upper punch via the press machine to mold the powder in the cavity; cancelling the fixation of the link mechanism via the first actuator, pushing down the upper platen via the press machine, and pushing down the lower platen and the die via the push rod to expose the compact from the cavity.
- the manufacturing method according to the aspect of the present invention employs the powder molding apparatus according to the aspect of the present invention, enabling manufacture of a compact and ejection of the manufactured compact from the cavity to be performed easily.
- a first pressing force (hold-down load) is applied from the second actuator to the upper punch to expose the compact from the cavity while the compact being pressed by the first pressing force, the first pressing force being lower than a second pressing force applied to push down the upper platen, the middle platen and the upper punch via the press machine to mold the powder in the cavity.
- FIG. 1 is a schematic diagram of Embodiment 1 of a powder molding apparatus according to an aspect of the present invention
- FIG. 2 is a schematic diagram illustrating a state in which a compact is being manufactured in Embodiment 1 of the powder molding apparatus
- FIG. 3 is a schematic diagram illustrating a state in which a compact is exposed from a cavity so that the compact can be ejected in Embodiment 1 of the powder molding apparatus;
- FIG. 4 is a schematic diagram of Embodiment 2 of the powder molding apparatus
- FIG. 5 is a schematic diagram illustrating a state in which a compact is being manufactured in Embodiment 2 of the powder molding apparatus
- FIG. 6 is a schematic diagram illustrating a state in which a compact is exposed from a cavity in Embodiment 2 of the powder molding apparatus.
- FIG. 7 is a schematic diagram illustrating a state in which the compact is exposed from the cavity so that the compact can be ejected in Embodiment 2 of the powder molding apparatus.
- Embodiments 1 and 2 of a powder molding apparatus according to the present invention and compact manufacturing methods will be described below with reference to the drawings.
- FIG. 1 is a schematic diagram of Embodiment 1 of a powder molding apparatus according to the present invention
- FIG. 2 is a schematic diagram illustrating a state in which a compact is being manufactured in Embodiment 1 of the powder molding apparatus
- FIG. 3 is a schematic diagram illustrating a state in which the compact is exposed from a cavity so that the compact can be ejected in Embodiment 1 of the powder molding apparatus.
- the illustrated powder molding apparatus 200 roughly includes a press machine 70 installed in a frame 100 , a die 10 , an upper punch 20 and a lower punch 30 , a middle platen 50 with the upper punch 20 attached thereto, an upper platen 40 , a link mechanism 90 connecting the upper platen 40 and the middle platen 50 , a first actuator 80 that fixes and cancels the fixation of the link mechanism 90 , a bolster 61 with the lower punch 30 attached thereto, and a lower platen 60 with the die 10 attached thereto.
- the lower punch 30 and the upper punch 20 are slidable inside a hollow 11 of the die 10 , and in FIG. 1 , metal powder F to be press-molded is charged in a cavity defined by the hollow 11 and the lower punch 30 .
- the upper punch 20 is attached to a lower surface of the middle platen 50 via a retainer 53 , and first guide posts 54 are attached to an upper surface of the middle platen 50 .
- a stopper 51 that holds a fixed position of the link mechanism 90 and a first actuator attachment portion 52 are provided on the upper surface of the middle platen 50 .
- First guide bushes 40 a through which the respective first guide posts 54 extend are provided in the upper platen 40 , a slider 72 included in the press machine 70 is mounted on an upper surface of the upper platen 40 , and push rods 41 are attached to a lower surface of the upper platen 40 .
- the lower punch 30 is attached to an upper surface of the bolster 61 via a retainer 63 , and second guide posts 62 are also attached to the upper surface of the bolster 61 .
- Second guide bushes 60 a through which the second guide posts 62 extend are provided in the lower platen 60 , and the die 10 is attached at the center of the lower platen 60 .
- a spring 64 is disposed around a periphery of each second guide post 62 projecting from the upper surface of the bolster 61 , and the springs 64 support the lower platen 60 while biasing the lower platen 60 upward.
- the press machine 70 includes an oil hydraulic cylinder 71 that slides a piston 71 a, and a slider 72 that receives a pressing force from the piston 71 a.
- the components of the powder molding apparatus 200 are housed in the frame 100 , and the oil hydraulic cylinder 71 included in the press machine 70 is fixed on a top surface of the frame, and the piston 71 a extends through the top surface and projects to the inside of the frame 100 , and a distal end of the piston 71 a is fixed to the slider 72 .
- the link mechanism 90 includes two links 91 and three joints 92 , the three joints 92 connecting the links 91 to the upper platen 40 and the middle platen 50 , respectively, and connecting the two links 91 to each other.
- the first actuator 80 includes an air cylinder 81 and a piston 82 , and a distal end of the piston 82 is attached to the joint 92 that is a middle joint among the three joints 92 .
- FIG. 1 illustrates a state in which the piston 82 has moved to a left end of the air cylinder 81 (Z 1 direction) and fixes the two links 91 , 91 linearly.
- metal powder F is charged in the cavity, and the link mechanism 90 is fixed linearly by the first actuator 80 , and then, as illustrated in FIG. 2 , the press machine 70 is activated to slide the piston 71 a to provide a pressing force P to the upper platen 40 via the slider 72 .
- the upper platen 40 Upon receipt of the pressing force P, the upper platen 40 pushes down the middle platen 50 and the upper punch 20 fixed to the lower surface of the middle platen 50 (X 1 direction) via the link mechanism 90 fixed linearly by the first actuator 80 , and the metal powder F is molded in the cavity defined by the die 10 and the lower punch 30 , whereby a compact C is manufactured.
- the compact C is ejected from the cavity.
- the piston 82 moves rightward inside the air cylinder 81 of the first actuator 80 (Z 2 direction) to pivot the two links 91 , 91 included in the link mechanism 90 around the respective joints 92 (respective Y 1 directions), whereby the linear fixation of the link mechanism 90 is cancelled.
- the compact C in the cavity moves upward relative to the die 10 (X 3 direction) and the compact C is then exposed to the outside of the cavity and the compact C can thus be ejected.
- fixation and cancellation of the fixation of the link mechanism 90 are performed, respectively, by the first actuator 80 , enabling a manufactured compact to be easily ejected without the need to make a height of the powder molding apparatus 200 to be high and the need to dig a pit at a site where the press is installed.
- FIG. 4 is a schematic diagram of Embodiment 2 of the powder molding apparatus
- FIG. 5 is a schematic diagram illustrating a state in which a compact is being manufactured in Embodiment 2 of the powder molding apparatus
- FIG. 6 is a schematic diagram illustrating a state in which the compact is exposed from a cavity in Embodiment 2 of the powder molding apparatus
- FIG. 7 is a schematic diagram illustrating a state in which the compact is exposed from the cavity so that the compact can be ejected in Embodiment 2 of the powder molding apparatus.
- a powder molding apparatus 200 A which is illustrated in FIG. 4 , is an apparatus obtained by adding two second actuators 80 A connecting the upper platen 40 and the middle platen 50 to the powder molding apparatus 200 .
- the two second actuators 80 A each include an air cylinder 81 A and a piston 82 A, and is disposed in such a manner that the piston 82 A moves up/down vertically.
- each of the second actuators 80 A a non-illustrated relief valve is provided, whereby a compact C is pressed while a load applied on an upper punch 20 (what is called “hold-down load”) being kept constant by the second actuators 80 A (see FIG. 6 ), and a pressing force from a press machine 70 is transmitted to a lower platen 60 equipped with a die 10 by push rods 41 , thereby the compact C being exposed to the outside of the cavity.
- the second actuators 80 A are actuators for applying a constant hold-down load to a compact C when the compact C is ejected.
- the press machine 70 is activated to apply a pressing force P to a middle platen 50 and the upper punch 20 fixed to a lower surface of the middle platen 50 via a link mechanism 90 fixed linearly by the first actuator 80 to push down the middle platen 50 and the upper punch 20 (X 1 direction), whereby a compact C is manufactured in the cavity defined by the die 10 and a lower punch 30 .
- a piston 82 is moved rightward (Z 2 direction) inside an air cylinder 81 of the first actuator 80 to pivot two links 91 , 91 included in the link mechanism 90 around respective joints 92 (respective Y 1 directions), whereby the linear fixation of the link mechanism 90 is cancelled.
- the pistons 82 A are moved upward inside the air cylinders 81 A of the respective second actuators 80 A (Z 3 direction) to apply a constant hold-down load from the second actuators 80 A to the middle platen 50 (X 4 direction) and apply the constant hold-down load to the upper punch 20 via the middle platen 50 (X 5 direction).
- the pistons 82 A are moved further upward inside the air cylinders 81 A of the respective second actuators 80 A (Z 4 direction) to move the middle platen 50 and the upper punch 20 upward (X 6 direction), whereby the compact C exposed to the outside of the cavity can be ejected.
- the powder molding apparatus 200 A can prevent a compact C from cracking when the compact C is ejected from the die 10 .
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Abstract
Description
- The disclosure of Japanese Patent Application No. 2015-185134 filed on Sep. 18, 2015 including the specification, drawings and abstract is incorporated herein by reference in its entirety.
- 1. Field of the Invention
- The present invention relates to a powder molding apparatus and a compact manufacturing method using the apparatus.
- 2. Description of Related Art
- various types of sintered parts are manufactured by press-molding metal powder into a compact and sintering the compact.
- In the aforementioned press molding, using a powder molding apparatus including a die having a hollow and an upper punch and a lower punch that slide inside the hollow of the die and form a cavity jointly with the hollow, a metal powder body is charged into the cavity and is pressurized by pushing down, for example, the upper punch, whereby a powder compact is manufactured.
- Japanese Patent Application Publication No. 6-188138 discloses a molding apparatus in which when a compact is ejected from a die, the die is pulled down using an actuator provided below the die, and molding apparatuses of this type are in common use.
- Employment of the molding apparatus disclosed in JP 6-188138 A requires providing an actuator and a mechanism (e.g., a rod) that connects the actuator and the die below the die, causing a problem in that a position of the die from the ground is often high.
- Also, for the convenience of work, the height of the die needs to be a height that allows an upper surface of the die to be viewed by a worker, and thus, a problem also arises in that it is necessary to dig a pit at a site where a press is to be installed to embed a lower portion of the press under the ground or it is necessary for the worker to stand on a platform and perform work.
- Furthermore, in ejection of a compact from the die, in order to prevent cracking of the compact, it is necessary to apply a hold-down load (the compact is ejected from the die in a state in which the compact is held between the lower punch and the upper punch and a load for the holding the compact in this situation is referred to as “hold-down load”).
- In order to keep the hold-down load constant, it is necessary to provide a load cell to perform control; however, the load cell needs to withstand not only the hold-down load, but also a molding load, resulting in problems in that the molding apparatus itself tends to large in size and is often expensive.
- The present invention provides a powder molding apparatus that enables a manufactured compact to be ejected easily without the need to make a height of the molding apparatus to be high and the need to dig a pit at a site where a press is to be installed and, and a compact manufacturing method using the apparatus.
- A powder molding apparatus according to an aspect of the present invention includes: a die having a hollow; an upper punch and a lower punch that slide inside the hollow of the die and form a cavity jointly with an inner wall of the hollow; a middle platen attached to the upper punch; an upper platen attached to a push rod; a press machine that pushes down the upper platen; a link mechanism that connects the upper platen and the middle platen; a first actuator that fixes the link mechanism and cancels the fixation of the link mechanism; a bolster attached to the lower punch; and a lower platen attached to the die, the lower platen being biased upward from the bolster via a spring, and descending of the upper platen and the push rod causes the lower platen and the die to be pushed downward by the push rod, and along with a downward movement of the die, the lower punch makes a upward movement inside the hollow with respect to the die.
- The powder molding apparatus according to the aspect of the present invention employs the configuration in which the first actuator fixes, and cancels the fixation of, a link mechanism connecting the upper platen attached to the push rod (injection push rod), the push rod pushing down the lower platen equipped with the die, and the middle platen equipped with the upper punch that slides inside the die.
- At the time of molding for press-molding powder charged in the cavity, the link mechanism is fixed by the first actuator, a pressing force from the press machine is transmitted to the upper platen, the pressing force is transmitted to the middle platen via the fixed link mechanism, and the pressing force is then transmitted to the upper punch provided on the middle platen, whereby the powder is press-molded.
- On the other hand, when a molded compact is ejected from the cavity, the first actuator cancels the fixation of the link mechanism, and the pressing force from the press machine is transmitted to the upper platen, but the pressing force is not transmitted to the middle platen via the unfixed link mechanism.
- Instead, the pressing force transmitted to the upper platen is transmitted to the lower platen equipped with the die by the push rod, whereby the lower platen and the die are pushed down. As a result of the die being pushed down, the compact molded on the lower punch inside the hollow of the die is exposed above the die, enabling ejection of the compact.
- Examples of the first actuator can include, e.g., an air cylinder mechanism and an oil hydraulic cylinder mechanism.
- Also, examples of the press machine can include a slide and a unit body including an oil hydraulic cylinder or the like and a slide.
- According to the powder molding apparatus according to the aspect of the present invention, in molding of powder and ejection of a compact, fixation and cancellation of the fixation of a link mechanism are performed, respectively, by the first actuator, enabling the manufactured compact to be easily ejected without the need to make a height of the molding apparatus to be high and the need to dig a pit at a site where the press is installed.
- In the powder molding apparatus according to the aspect of the present invention, the link mechanism may include two links and three joints, the three joints connecting the links, the upper platen and the middle platen, respectively, and connecting the two links.
- In the powder molding apparatus according to the aspect of the present invention, the first actuator may include an air cylinder and a piston, and a distal end of the piston may be attached to the joint that is a middle joint among the three joints.
- Also, the powder molding apparatus according to the aspect of the present invention may further include a second actuator between the upper platen and the middle platen.
- As with the first actuator, the second actuator includes, e.g., an air cylinder mechanism or an oil hydraulic cylinder mechanism.
- After a compact is molded in the cavity, the fixation of the link mechanism is cancelled by the first actuator, and a pressing force from the press machine is thus transmitted to the lower platen equipped with the die, via the push rod to push the lower platen and the die down. Here, if the second actuator is not provided, no pressing force is applied to the upper punch, but because of the provision of the second actuator, the die can be pushed down while the compact being pressed by the second actuator with a pressing force that is smaller than a pressing force applied at the time of the molding.
- In the second actuator, for example, a relief valve is provided, enabling a compact to be pressed while a load applied on the upper punch (what is called “hold-down load”) being kept constant by the second actuator, and also a pressing force from the press machine to be transmitted to the lower platen equipped with the die, by the push rod to push the lower platen and the die down, whereby the compact is exposed from the cavity.
- Also, the aspect of the present invention also provides a compact manufacturing method, and the manufacturing method is a compact manufacturing method using the above powder molding apparatus, the method including: charging powder into the cavity; manufacturing a compact by fixing the link mechanism via the first actuator, and pushing down the upper platen, the middle platen and the upper punch via the press machine to mold the powder in the cavity; cancelling the fixation of the link mechanism via the first actuator, pushing down the upper platen via the press machine, and pushing down the lower platen and the die via the push rod to expose the compact from the cavity.
- The manufacturing method according to the aspect of the present invention employs the powder molding apparatus according to the aspect of the present invention, enabling manufacture of a compact and ejection of the manufactured compact from the cavity to be performed easily.
- Also, during exposure of the compact from the cavity, a first pressing force (hold-down load) is applied from the second actuator to the upper punch to expose the compact from the cavity while the compact being pressed by the first pressing force, the first pressing force being lower than a second pressing force applied to push down the upper platen, the middle platen and the upper punch via the press machine to mold the powder in the cavity.
- As can be understood from the above statement, with the powder molding apparatus according to the aspect of the present invention and the compact manufacturing method according to the aspect of the present invention, in molding of powder and ejection of a compact, fixation and cancellation of the fixation of the link mechanism are performed, respectively, by the first actuator, enabling the manufactured compact to be easily ejected without the need to make a height of the molding apparatus to be high and the need to dig a pit at a site where the press is installed.
- Features, advantages, and technical and industrial significance of exemplary embodiments of the invention will be described below with reference to the accompanying drawings, in which like numerals denote like elements, and wherein:
-
FIG. 1 is a schematic diagram of Embodiment 1 of a powder molding apparatus according to an aspect of the present invention; -
FIG. 2 is a schematic diagram illustrating a state in which a compact is being manufactured in Embodiment 1 of the powder molding apparatus; -
FIG. 3 is a schematic diagram illustrating a state in which a compact is exposed from a cavity so that the compact can be ejected in Embodiment 1 of the powder molding apparatus; -
FIG. 4 is a schematic diagram of Embodiment 2 of the powder molding apparatus; -
FIG. 5 is a schematic diagram illustrating a state in which a compact is being manufactured in Embodiment 2 of the powder molding apparatus; -
FIG. 6 is a schematic diagram illustrating a state in which a compact is exposed from a cavity in Embodiment 2 of the powder molding apparatus; and -
FIG. 7 is a schematic diagram illustrating a state in which the compact is exposed from the cavity so that the compact can be ejected in Embodiment 2 of the powder molding apparatus. - Embodiments 1 and 2 of a powder molding apparatus according to the present invention and compact manufacturing methods will be described below with reference to the drawings.
- (Embodiment 1 of powder molding apparatus and compact manufacturing method)
FIG. 1 is a schematic diagram of Embodiment 1 of a powder molding apparatus according to the present invention,FIG. 2 is a schematic diagram illustrating a state in which a compact is being manufactured in Embodiment 1 of the powder molding apparatus, andFIG. 3 is a schematic diagram illustrating a state in which the compact is exposed from a cavity so that the compact can be ejected in Embodiment 1 of the powder molding apparatus. - The illustrated
powder molding apparatus 200 roughly includes apress machine 70 installed in aframe 100, adie 10, anupper punch 20 and alower punch 30, amiddle platen 50 with theupper punch 20 attached thereto, anupper platen 40, alink mechanism 90 connecting theupper platen 40 and themiddle platen 50, afirst actuator 80 that fixes and cancels the fixation of thelink mechanism 90, abolster 61 with thelower punch 30 attached thereto, and alower platen 60 with the die 10 attached thereto. - The
lower punch 30 and theupper punch 20 are slidable inside a hollow 11 of thedie 10, and inFIG. 1 , metal powder F to be press-molded is charged in a cavity defined by the hollow 11 and thelower punch 30. - The
upper punch 20 is attached to a lower surface of themiddle platen 50 via aretainer 53, andfirst guide posts 54 are attached to an upper surface of themiddle platen 50. - Also, a
stopper 51 that holds a fixed position of thelink mechanism 90 and a firstactuator attachment portion 52 are provided on the upper surface of themiddle platen 50. -
First guide bushes 40 a through which the respectivefirst guide posts 54 extend are provided in theupper platen 40, aslider 72 included in thepress machine 70 is mounted on an upper surface of theupper platen 40, andpush rods 41 are attached to a lower surface of theupper platen 40. - The
lower punch 30 is attached to an upper surface of thebolster 61 via aretainer 63, andsecond guide posts 62 are also attached to the upper surface of thebolster 61. - Second guide bushes 60 a through which the
second guide posts 62 extend are provided in thelower platen 60, and thedie 10 is attached at the center of thelower platen 60. - A
spring 64 is disposed around a periphery of eachsecond guide post 62 projecting from the upper surface of thebolster 61, and thesprings 64 support thelower platen 60 while biasing thelower platen 60 upward. - The
press machine 70 includes an oilhydraulic cylinder 71 that slides apiston 71 a, and aslider 72 that receives a pressing force from thepiston 71 a. - The components of the
powder molding apparatus 200 are housed in theframe 100, and the oilhydraulic cylinder 71 included in thepress machine 70 is fixed on a top surface of the frame, and thepiston 71 a extends through the top surface and projects to the inside of theframe 100, and a distal end of thepiston 71 a is fixed to theslider 72. - The
link mechanism 90 includes twolinks 91 and threejoints 92, the threejoints 92 connecting thelinks 91 to theupper platen 40 and themiddle platen 50, respectively, and connecting the twolinks 91 to each other. - The
first actuator 80 includes anair cylinder 81 and apiston 82, and a distal end of thepiston 82 is attached to thejoint 92 that is a middle joint among the threejoints 92. -
FIG. 1 illustrates a state in which thepiston 82 has moved to a left end of the air cylinder 81 (Z1 direction) and fixes the twolinks - As illustrated in
FIG. 1 , metal powder F is charged in the cavity, and thelink mechanism 90 is fixed linearly by thefirst actuator 80, and then, as illustrated inFIG. 2 , thepress machine 70 is activated to slide thepiston 71 a to provide a pressing force P to theupper platen 40 via theslider 72. - Upon receipt of the pressing force P, the
upper platen 40 pushes down themiddle platen 50 and theupper punch 20 fixed to the lower surface of the middle platen 50 (X1 direction) via thelink mechanism 90 fixed linearly by thefirst actuator 80, and the metal powder F is molded in the cavity defined by thedie 10 and thelower punch 30, whereby a compact C is manufactured. - After the manufacture of the compact C, next, the compact C is ejected from the cavity.
- More specifically, as illustrated in
FIG. 3 , thepiston 82 moves rightward inside theair cylinder 81 of the first actuator 80 (Z2 direction) to pivot the twolinks link mechanism 90 around the respective joints 92 (respective Y1 directions), whereby the linear fixation of thelink mechanism 90 is cancelled. - Upon the
press machine 70 being activated (pressing force P′) concurrently with the cancellation of the fixation of thelink mechanism 90, thelower platen 60 and the die 10 are pushed down against the biasing force from thespring 64, via the push rods 41 (X2 direction) while the pressing of the compact C by theupper punch 20 being cancelled. - As a result of the die 10 being pushed down, the compact C in the cavity moves upward relative to the die 10 (X3 direction) and the compact C is then exposed to the outside of the cavity and the compact C can thus be ejected.
- As described above, according to the
powder molding apparatus 200, in molding of metal powder F and ejection of a compact C, fixation and cancellation of the fixation of thelink mechanism 90 are performed, respectively, by thefirst actuator 80, enabling a manufactured compact to be easily ejected without the need to make a height of thepowder molding apparatus 200 to be high and the need to dig a pit at a site where the press is installed. - (Embodiment 2 of powder molding apparatus and compact manufacturing method)
FIG. 4 is a schematic diagram of Embodiment 2 of the powder molding apparatus, andFIG. 5 is a schematic diagram illustrating a state in which a compact is being manufactured in Embodiment 2 of the powder molding apparatus. Also,FIG. 6 is a schematic diagram illustrating a state in which the compact is exposed from a cavity in Embodiment 2 of the powder molding apparatus, andFIG. 7 is a schematic diagram illustrating a state in which the compact is exposed from the cavity so that the compact can be ejected in Embodiment 2 of the powder molding apparatus. - A
powder molding apparatus 200A, which is illustrated inFIG. 4 , is an apparatus obtained by adding twosecond actuators 80A connecting theupper platen 40 and themiddle platen 50 to thepowder molding apparatus 200. - As illustrated in
FIG. 4 , the twosecond actuators 80A each include anair cylinder 81A and apiston 82A, and is disposed in such a manner that thepiston 82A moves up/down vertically. - In each of the
second actuators 80A, a non-illustrated relief valve is provided, whereby a compact C is pressed while a load applied on an upper punch 20 (what is called “hold-down load”) being kept constant by thesecond actuators 80A (seeFIG. 6 ), and a pressing force from apress machine 70 is transmitted to alower platen 60 equipped with a die 10 bypush rods 41, thereby the compact C being exposed to the outside of the cavity. - In other words, the
second actuators 80A are actuators for applying a constant hold-down load to a compact C when the compact C is ejected. - Here, a compact manufacturing method using the
powder molding apparatus 200A will generally be described. - As illustrated in
FIG. 5 , thepress machine 70 is activated to apply a pressing force P to amiddle platen 50 and theupper punch 20 fixed to a lower surface of themiddle platen 50 via alink mechanism 90 fixed linearly by thefirst actuator 80 to push down themiddle platen 50 and the upper punch 20 (X1 direction), whereby a compact C is manufactured in the cavity defined by thedie 10 and alower punch 30. - Next, as illustrated in
FIG. 6 , apiston 82 is moved rightward (Z2 direction) inside anair cylinder 81 of thefirst actuator 80 to pivot twolinks link mechanism 90 around respective joints 92 (respective Y1 directions), whereby the linear fixation of thelink mechanism 90 is cancelled. - Furthermore, the
pistons 82A are moved upward inside theair cylinders 81A of the respectivesecond actuators 80A (Z3 direction) to apply a constant hold-down load from thesecond actuators 80A to the middle platen 50 (X4 direction) and apply the constant hold-down load to theupper punch 20 via the middle platen 50 (X5 direction). - With the compact C held by the constant hold-down load, a pressing force V from the
press machine 70 pushes down thelower platen 60 and the die 10 against a biasing force of thespring 64, via the push rods 41 (X2 direction). - As illustrated in
FIG. 6 , as a result of the die 10 being pushed down, the compact C in the cavity moves upward relative to the die 10 (X3 direction). - As illustrated in
FIG. 7 , thepistons 82A are moved further upward inside theair cylinders 81A of the respectivesecond actuators 80A (Z4 direction) to move themiddle platen 50 and theupper punch 20 upward (X6 direction), whereby the compact C exposed to the outside of the cavity can be ejected. - In addition to the effects provided when the
powder molding apparatus 200 is used, thepowder molding apparatus 200A can prevent a compact C from cracking when the compact C is ejected from thedie 10. - Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configurations are not limited to those of these embodiments, and alternations in design and the like of such specific configurations without departing from the spirit of the present invention also fall within the scope of the present invention.
Claims (7)
Applications Claiming Priority (2)
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JP2015-185134 | 2015-09-18 | ||
JP2015185134A JP6332213B2 (en) | 2015-09-18 | 2015-09-18 | Powder molding apparatus and method for producing molded body |
Publications (1)
Publication Number | Publication Date |
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US20170080492A1 true US20170080492A1 (en) | 2017-03-23 |
Family
ID=58276365
Family Applications (1)
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US15/265,411 Abandoned US20170080492A1 (en) | 2015-09-18 | 2016-09-14 | Powder molding apparatus and compact manufacturing method |
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US (1) | US20170080492A1 (en) |
JP (1) | JP6332213B2 (en) |
CN (1) | CN106541131B (en) |
Cited By (4)
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CN109926580A (en) * | 2019-04-25 | 2019-06-25 | 扬州得意模具制造有限公司 | A kind of powder metallurgy die improving engine piston ring compacting efficiency |
CN110618005A (en) * | 2019-09-06 | 2019-12-27 | 山东科技大学 | Preparation device and preparation method for similar simulation material cylindrical standard test piece |
CN112109369A (en) * | 2020-07-16 | 2020-12-22 | 梁奇 | Energy-concerving and environment-protective type's agricultural straw briquetting device |
CN114346242A (en) * | 2021-12-16 | 2022-04-15 | 吴中文 | Metallurgical push-down type blank forming device |
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CN107672215A (en) * | 2017-08-23 | 2018-02-09 | 九江有色金属冶炼股份有限公司 | A kind of shaping equipment in carbon reduction tantalum niobium metal bar |
KR102131149B1 (en) * | 2018-06-22 | 2020-07-07 | 한국생산기술연구원 | molding system facilitating realization of double action along up and down direction |
CN112893835B (en) * | 2021-01-22 | 2022-08-12 | 嘉兴市长宏铜业股份有限公司 | Powder metallurgy is with pressed compact device with automatic feeding structure |
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CN114346242A (en) * | 2021-12-16 | 2022-04-15 | 吴中文 | Metallurgical push-down type blank forming device |
Also Published As
Publication number | Publication date |
---|---|
CN106541131A (en) | 2017-03-29 |
JP6332213B2 (en) | 2018-05-30 |
JP2017056483A (en) | 2017-03-23 |
CN106541131B (en) | 2018-10-23 |
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