KR20230093809A - The powder molding presses of powder fill installation - Google Patents

Abstract

The present invention is an upper press mold having an upper punch in the center; a lower press mold corresponding to the upper press mold; a powder supply unit located on an upper surface of the lower press mold to supply powder; a lower cylinder located at the lower end of the lower press mold; an upper cylinder positioned at an upper end of the lower cylinder; consists of,
It relates to a detachable powder molding device of a powder molding press that is configured to be detachable and is compatible with existing powder molding devices.

Description

Detachable powder molding device of powder molding press {The powder molding presses of powder fill installation}

In a powder molding press for molding a product using powder, the present invention provides a powder molding device for powder molding by a powder supply device for filling a mold with a powder raw material in a hopper, but the powder molding device can be attached or detached. It is configured to do so, and it relates to a detachable powder molding device of a powder molding press having compatibility that can be applied to existing powder molding devices.

In general, powder molding presses, when manufacturing products that are difficult to work with in other molds, fill a mold with powder raw materials, compress them, mold them into a product of the desired shape, and then apply heat to bake the compressed product to complete the product. , It is used in the production of various products due to its excellent product quality, shortening of the production process as it can omit machining, and ease of mass production.

The basic configuration and operation of a conventional general powder molding press is that the powder supply device receiving the powder raw material from the hopper flows back and forth by a cylinder or other device to fill the lower mold with the powder raw material, and then the upper mold moves downward to form the lower mold. The powder material filled in the lower mold is compressed and molded by the compression of the upper mold, and when the upper mold is transferred to the upper side again, the product formed in the lower mold is separated from the mold and the powder supply device is transferred again to form the powder material in the lower mold While repeating the process of filling the product is formed by the powder molding press.

However, when the powder raw material is supplied to the lower mold by the powder supply device of the general powder molding press as described above, the powder supply device moves in a straight line back and forth to fill the lower mold with the powder raw material, so that the powder raw material is inside the lower mold The problem is that they are not stacked evenly and piled up on one side. The density of the powder raw material filled in the lower mold is not constant, so when the product is compressed and molded, the durability of the product is lowered, as well as the bulky product. A bigger problem occurred during molding, resulting in an increase in the defective rate of the product.

In order to solve the problems of the powder supply device of the conventional general powder molding press as described above, Korean Utility Model Application No. 1997-32204 (hereinafter referred to as 'prior art') "Powder supply device of molding press for powder metallurgy" has been disclosed and used, and its configuration is as follows.

A pneumatic cylinder I fixed to one side and moving is installed, and a guider formed with a guide rail on the other side, connected to the rod of the pneumatic cylinder I, guided by the guide rail and transported back and forth while supplying powder material It consists of a shoe and a pneumatic cylinder II connected to one side of the guide rail of the guider and shaking the guider left and right when supplying powder material to the shoe.

In the prior art configured as described above, the shoe for supplying powder raw materials to the lower mold moves in a straight line back and forth, and at the same time, when supplying powder raw materials to the lower mold, the guider is shaken from side to side by an additionally configured cylinder. As a result, the shoe is shaken from side to side. It is possible to obtain some effect in evenly supplying the powder raw material to the lower mold.

However, the prior art as described above is not easy to manufacture because a separate cylinder and components must be additionally installed in a general powder molding press to shake the shoe left and right, and there are significant problems in the configuration. When producing the shoe, a separate process of moving the shoe left and right instead of forward and backward is added, and as the manufacturing time is extended, there is a problem in that efficiency is lowered in mass production.

In order to solve these problems, a powder supply device for a powder molding press, which is registered as an inventor and registered by the applicant of the present application, is disclosed in Korean Patent Registration No. 10-0988356. By making it possible to fill the entire mold uniformly and evenly with the raw material, to prevent the density of molded products from being different for each part due to the difference in the amount of powder raw material supplied, so that the durability of the product can be increased even when molding bulky products. At the same time, it provides a powder supply device of a powder molding press that can minimize the defective rate of the product.

Such prior patents solve the problems of the existing prior art because they can evenly distribute the density when powder is introduced to form a molded product.

However, in the case of each of the above-described prior art and prior patents invented by the present applicant, there is a limit that is mainly applied only to a powder press device for molding using one powder.

That is, in some cases, when molding parts, etc., a product such as a ring is used by being divided into a surface on which frictional force is greatly applied and a surface on which frictional force is not greatly applied. In the case of use after molding, in the case of the upper surface where the frictional force is relatively large, wear is considerable, so it cannot be used as long as the life span and must be replaced.

For convenience of understanding, the 'ring' product is described as an example, and the surface with high frictional force is named the upper surface and the surface with low frictional force is named the lower surface, and it is necessary to understand that the outer and inner surfaces of the ring do not correspond to this.

In order to prevent this, powder with excellent abrasion properties can be applied, but in this case, on the contrary, in the case of the lower surface where the frictional force does not act significantly, powder with excellent abrasion power more than necessary is applied, which can act as a factor in increasing the production cost.

Republic of Korea Utility Model Application No. 1997-32204 Republic of Korea Patent Registration No. 10-0988356

Therefore, the present invention is to solve the above problems, when trying to obtain products having different frictional forces through a powder molding process, powder having excellent abrasion properties is applied to the surface with high frictional force, and to the surface with relatively small frictional force Its purpose is to obtain powder molded products by applying powder with relatively low abrasiveness.

In addition, in the present invention, when pressing while supplying double powder, the lifting operation of the lifting plate rising from the lower mold is controlled in two stages and raised, so that molding using powder with excellent abrasion and powder with relatively low abrasion is free There are other purposes for constructing.

In addition, another object of the present invention is to configure a structure such as a piston and a cylinder capable of two-stage lifting control to be detachable, so that it can be applied to a powder molding press that has been manufactured and installed in the past.

The present invention for achieving the above object,

An upper press mold having an upper punch in the center;

a lower press mold corresponding to the upper press mold;

a powder supply unit located on an upper surface of the lower press mold to supply powder;

a lower cylinder located at the lower end of the lower press mold;

an upper cylinder positioned at an upper end of the lower cylinder;

a piston moving up and down in the upper cylinder according to the operation of the lower cylinder;

includes

According to the present invention, when products with different frictional forces are to be obtained through a powder molding process, powder with excellent abrasion properties is applied to the surface with high frictional force, and powder with relatively low abrasionability is applied to the surface with relatively small frictional force. To obtain a powder molded product, it has the effect of significantly extending the life cycle of the product obtained by powder molding.

In addition, according to the present invention, when the double powder is supplied and pressed, the lifting plate rising from the lower mold and the lifting operation of the piston interlocking with it are controlled in two stages, so that powder with excellent wearability and relatively low wearability It can be configured so that molding using powder is free, and has an effect of improving product moldability and product reliability.

In addition, according to the present invention, the structure such as the piston and cylinder capable of the above-mentioned two-stage lifting control is configured to be detachable, so that it can be applied to powder molding presses that have been manufactured and installed in the past. By providing a structure compatible with It can significantly reduce production cost by achieving an innovative production process, which has the effect of realizing a cost advantage strategy compared to competitors.

1 shows only the lower mold adopted in the present invention, and is a schematic view showing a state in which the lower mold can be raised by the operation of the lower cylinder.
Figure 2 is a schematic cross-sectional view showing the components of the lower mold according to Figure 1
Figure 3 is a schematic view showing a state in which the powder supply unit is moved so that the primary powder can be supplied according to the movement of the hopper in the state of FIG.
4 is a schematic view showing a state in which primary powder is filled into the die at the center of the die plate as the die plate of the lower mold rises by the operation of the lower cylinder at the bottom among the components of the lower mold.
FIG. 5 is a schematic diagram showing a state in which the powder supply unit moves to fill the secondary powder after the first powder is filled into the die by FIG. 4;
6 is a state in which the pressure of the lower cylinder is provided in the state of FIG. 5, as the air filled in the upper space on the upper cylinder side is discharged, the die plate rises secondarily according to the rise of the piston inside the upper cylinder, and 1 A drawing schematically showing that the secondary powder is filled on the upper side where the secondary powder is filled
7 is a view showing a state in which a product can be molded by applying pressure to a die filled with primary powder and secondary powder as the upper mold descends;
8 is a view showing a state in which the die plate is lowered according to the operation of the lower cylinder and the product is discharged to the upper surface of the die plate after the product molding of FIG. 7 is completed.
9 is a view schematically showing a state in which a core is provided in the inner center in another embodiment of the present invention
10 is an example of an upper mold applied to the present invention

Specific structural or functional descriptions of the embodiments according to the concept of the present invention disclosed in this specification are only illustrated for the purpose of explaining the embodiments according to the concept of the present invention, and the embodiments according to the concept of the present invention Various changes can be made and various forms can be made, so all changes, equivalents, or substitutes included in the spirit and technical scope of the present invention are included, and terms or words used in the specification and claims are conventional or dictionary. Meanings and concepts consistent with the technical idea of the present invention, based on the fact that the inventor can appropriately define the concept of terms in order to explain his/her invention in the best way, as well as not be construed as limited in meaning. should be interpreted as Therefore, the embodiments described in the specification of the present invention and the configurations shown in the drawings are only one of the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention, and thus replace them at the time of filing of the present invention. It should be understood that various equivalents and variations are possible or exist.

In addition, unless otherwise defined in the specification of the present invention, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the present invention belongs. have Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in this specification, it should not be interpreted in an ideal or excessively formal meaning. don't

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

As shown in the accompanying drawings, the present invention includes an upper press mold 100, a lower press mold 200 corresponding thereto, a lower cylinder 300 located at the lower end, and a lower cylinder 300 located at the upper end It consists of an upper cylinder 250 and a piston 251 that moves up and down according to the operation of the lower cylinder 300 inside the upper cylinder 250 .

The upper press mold 100 may be composed of a known upper press mold having an upper punch 110 in the center.

The upper punch 110 in the center is configured to enter the center of the lower press mold 200 toward the die side filled with powder and mold the powder.

The lower press mold 200 includes a die plate 230 facing the upper press mold, a guide rod 220 penetrating both sides of the die plate 230, and a base provided in the middle of the guide rod 220. A plate 210, an elevating plate 240 connected to the lower end of the guide rod 220, an upper cylinder 250 provided between the elevating plate 240 and the base plate 210, and the elevating plate ( 240) It consists of a lower cylinder 300 provided at the bottom.

To explain this in more detail, the die plate 230 is connected to the upper side of the guide rod 220 penetrating both sides of the base plate 210 so that it can be moved up and down.

The base plate 210 is fixed and does not move up and down.

The die plate 230 is opposed to the upper press mold 100 and means a configuration positioned on the lower side, and a die 231 fixed by a die clamp 232 is provided in the center area thereof, and the die 231 It has a structure in which a molding hole 213 is formed in the center.

Powder is supplied to the upper surface of the die plate 230 from a hopper storing powder, and a powder supply unit 400 for filling and supplying powder is provided on the molding hole 233 side of the die 231 .

The powder supply unit 400 is reciprocally transported along the upper surface of the die plate 230, and is partitioned so that the primary powder and the secondary powder can be respectively accommodated from the side of the hopper (not shown), and the primary powder storage unit 410 and the secondary powder storage unit In the state of being divided into parts 420, the primary powder and the secondary powder are sequentially introduced into the forming hole 233 provided in the center of the die 231 of the base plate 210.

Meanwhile, an elevating plate 240 connected to the lower end of the guide rod 220 is provided, and a lower cylinder 300 for vertically moving the elevating plate 240 is connected to the lower end.

In addition, an upper cylinder 250 is provided between the base plate 210 and the elevating plate 240 .

On the other hand, the above-described upper cylinder 250 is fixed to the lower side of the above-described base plate 210 by bolts 270, etc., and the piston 251 provided under the upper cylinder 250 operates the lower cylinder 300. Accordingly, it has a structure capable of moving up and down.

That is, as shown in the drawing, the inside of the upper cylinder 250 is provided with a piston 251 for moving up and down according to the operation of the lower cylinder 300, and for adjusting the position of the piston 251, the piston ( 251) The adjuster part 252 in contact with the lower end surface of the upper end, the adjustment nut 253 extending to the outside of the upper cylinder 250 to adjust the adjuster part 252, and the lower end of the adjuster part 252 It is provided with an adjusting ring 254 for support, and is fitted and fixed inside the lower end of the piston 251.

The outer circumferential surface of the body part 251b of the piston 251 and the inner circumferential surface of the adjusting part 252 are screwed together, and the adjusting nut 253 in contact with the outer circumferential surface of the adjusting part 252 is also screwed together. When the adjustment nut 253 is rotated, the adjuster 252 rises or falls, so that the position of the piston 251 can be adjusted.

On the other hand, as shown in the accompanying drawings, the upper cylinder 250 forms a space portion 258 spaced apart from the outer cylinder body 256 and the inner cylinder body 257, and is connected to the space portion 258 to form an upper cylinder (250) A flow path 259 connected to the outside is formed.

The above-mentioned piston 251 has a structure that moves up and down along the space part 258 side of the upper cylinder 250. As shown in FIG. 2, the upper head part 251a of the piston 251 and the head part It consists of a body portion 251b extending downward from 251a and has a through hole 251c formed in the center, and the inner cylinder 257 of the upper cylinder 250 is inserted into the through hole 251c and fitted. It has a shape, and the fixing part 260 coupled to the lower end of the piston 251 is connected to the lifting plate 240.

It is connected to the upper end of the fixing part 260 and the piston 251 moves up and down along the inner cylinder 257 of the upper cylinder 250 according to the operation of the lower cylinder 300 .

The upper end of the lower punch 255 is located in the forming hole 233 of the die 231 provided at the center of the die plate 230, and the primary powder storage unit 410 and the secondary storage unit 410 of the powder supply unit 400 As the upper press mold 100 descends, the upper punch 110 is inserted into the molding hole 233 so that the powders supplied sequentially from the powder storage unit 420 are supported at the bottom so that the primary and secondary powders can be molded. will play a role

The head part 251a of the piston 251 is spaced apart from the inner upper end side of the upper cylinder 250 at regular intervals in a state of being inserted into the upper cylinder 250 to form a space part 258, such a space part Even if the lower cylinder 300 is operated by 258 and the elevation plate 240 and the die plate 230 rise at the same time, the air inside the space 258 is removed due to the air filled in the space 258. It rises only up to the maximum compression stroke distance.

That is, the lower cylinder 300 provides hydraulic pressure to continuously ascend, but reaches a point at which it no longer ascends due to the compressive force of the air compressed in the space 258 .

Such a rise is referred to as a primary rise in the present invention.

In this state, when the passage 259 connected to the space 258 of the upper cylinder 250 is opened, the compressed air in the space 258 goes through a series of processes in which it is discharged through the passage 259. , The pressure applied to the space portion 258 is released, and the elevating plate 240 and the die plate 230 go through a process of being raised secondarily.

This process will be described again with reference to the drawings.

First, in a state where the primary powder and the secondary powder are stored in the primary powder storage unit 410 and the secondary powder storage unit 420 of the powder supply unit 400, respectively, from the side of the hopper (not shown), the powder supply unit 400 As shown in FIG. 3, the primary powder storage unit 410 of the powder supply unit 400 is transferred to the forming hole 233 provided at the center of the die 231 of the die plate 230.

In this state, as shown in FIG. 4, by the operation of the lower cylinder 300, the lifting plate 240 and the piston 251 provided inside the upper cylinder 250 are raised in conjunction with the lifting plate 240. process, and at the same time, the die plate 230 also rises the same stroke distance, forming a gap inside the molding hole 233, and the primary powder from the primary powder storage unit 410 is injected into the molding hole 233 going through the process

Meanwhile, even in a state in which the primary powder is injected into the molding hole 233 and filled, the lower cylinder 300 is in a state in which upward pressure is continuously provided by providing hydraulic pressure.

In this way, the lift plate 240 and the piston 251 are continuously raised by the hydraulic pressure of the lower cylinder 300, but as described above, the space between the upper cylinder 250 and the head part 251a of the piston 251 The air present in section 258 is in a compressed state.

That is, the air in the space 258 is compressed, but since the flow path 259 passing to the outside is closed, the upward pressure applied by the hydraulic pressure of the lower cylinder 300 by the compressed air no longer exerts force. The die plate 230 and the elevating plate 240 can be raised by the volume that the molding hole 233 is filled with the primary powder.

As described above, the filling amount of the primary powder can be adjusted, for example, by adjusting the space between the head part 251a of the piston 251 and the upper bottom surface of the upper cylinder 250.

That is, since the adjustment part 252 in contact with the bottom surface of the head part 251a of the piston 251 can be adjusted up and down using the adjustment nut 253, etc., the initial position value of the piston 251 can be set by adjusting it. be able to

According to the initial setting value of the piston 251, the up and down stroke distance of the piston 251 can be adjusted, so that the up and down stroke distance of the lift plate 240 and the die plate 230 can be adjusted. It is possible to adjust the filling amount of the primary powder filled in according to the working conditions, that is, according to the characteristics of the product.

On the other hand, as described above, in a state in which the filling of the first powder in the molding hole 233 is completed by the first rise, the powder supply unit 400 retreats as shown in FIG. 5, so that the second powder storage unit 420 After moving to a state located on the upper surface of the molding hole 233, it stops.

In this state, when the flow passage 259 connected to the space portion 258 side of the upper cylinder 250 is opened, the air compressed in the space portion 258 is discharged through the flow passage 259. As shown in FIG. 6, the die plate 230 and the elevating plate 240 rise secondly.

As shown in FIG. 6 by this secondary rise, the primary powder filled in the molding hole 233 is positioned relatively downward, and a space is formed upward of the primary powder to pass through the process of filling the secondary powder. do.

When the secondary powder is filled in the molding hole 233, as shown in FIG. 6, the primary powder is positioned below and the secondary powder is filled upward to form a double powder layer.

Here, the primary powder may be a powder having relatively low abrasion resistance, whereas the secondary powder may be a powder having relatively strong abrasion resistance. Of course, the opposite is also possible.

As shown in FIG. 7, when the operation of filling the molding hole 233 with the first powder and the second powder in different layers is completed, the powder supply unit 400 is completely moved to the rear side and removed, and then the upper press mold 100 ), the upper punch 110 provided in the center of the upper press mold 100 enters the molding hole 233 side as the upper press mold 100 descends, and pressurizes and molds the powder in which the first powder and the second powder are layered. will go through

FIG. 8 shows that the hydraulic pressure applied to the lower cylinder 300 is removed after the same operation as in FIG. 7 is completed and the first powder and the second powder are compression-molded, and the die plate 230 and the lifting plate 240 are lowered at the same time. Accordingly, after the powder compression molded product is discharged to the upper surface of the die plate 230, it can be discharged to the side of the tray (not shown).

9 shows another example in the present invention, and a core 500 connected to the elevating plate 240 from the inside of the lower punch 255 may be configured. In the case of a final powder molded product by the configuration of the core 500 described above, a ring-shaped product may be obtained.

On the other hand, in the present invention performing such an operation, the upper cylinder 250 and the piston 251 located on the upper side of the lifting plate 240 and the adjustment nut 253 and the adjuster 252 attached thereto are A detachable structure between the base plate 210 and the elevating plate 240 was provided.

That is, as shown in FIG. 2, the upper cylinder 250 itself can be pulled out in all directions by configuring the assembly between the upper end of the upper cylinder 250 and the base plate 210 by means of bolts 270.

With this structure, it is possible to assemble the upper cylinder 250 to which the present invention is applied even in an existing powder molding press device, and in some cases, when maintenance is required, it is separated for maintenance work or replacement of other parts. It will make the work easier to do.

As described above, although the present invention has been described with limited embodiments and drawings, the present invention is not limited to the above embodiments, of course, from the above description by a person having ordinary technical knowledge in the field to which the present invention belongs. Of course, various modifications and variations may be possible.

Therefore, the technical idea in the present invention should be grasped by the claims described below, but it will be obvious that all equivalent or equivalent modifications belong to the scope of the technical idea of the present invention.

100; Upper press mold 111; upper punch
200; Lower press mold 210; base plate
220; guide rod 230; die plate
231; die 232; die clamp
233; molder 240; lift plate
250; upper cylinder 251; piston
251a; head portion 251b; body part
251c; through hole 252; Adjust part
253; adjustment nut 254; adjustment ring
255; lower punch 256; outer cylinder
257; Inner cylinder 258; space department
259; Euro 260; fixed part
270; bolt 300; lower cylinder
400; Powder supply unit 410; 1st powder storage
420; Secondary powder storage unit 500; core

Claims (8)

An upper press mold having an upper punch in the center;
a lower press mold corresponding to the upper press mold;
a powder supply unit located on an upper surface of the lower press mold to supply powder;
a lower cylinder located at the lower end of the lower press mold;
an upper cylinder positioned at an upper end of the lower cylinder;
Detachable powder molding device of a powder molding press comprising a.
According to claim 1,
The lower press mold,
A base plate facing and fixed to the upper press mold;
guide rods penetrating both sides of the base plate;
a die plate connected to an upper end of the guide rod;
an elevation plate connected to the lower end of the guide rod;
an upper cylinder provided between the elevating plate and the base plate;
A detachable powder molding apparatus of a powder molding press, comprising moving the die plate and the lifting plate up and down at the same time according to the operation of the lower cylinder provided at the lower end of the lifting plate.
According to claim 2,
The die plate,
A detachable powder molding apparatus of a powder molding press comprising a die fixed by a die clamp in a central area and a molding hole provided in the center of the die.
According to claim 1,
The upper cylinder,
a piston for moving up and down according to the operation of the lower cylinder;
an adjuster provided in contact with a bottom surface of an upper end of the piston to adjust the position of the piston;
an adjustment nut extending to the outside of the upper cylinder to adjust the adjuster;
an adjustment ring supporting the lower end of the adjuster;
a fixing part coupled to the lower end of the piston;
Detachable powder molding device of a powder molding press comprising a.
According to claim 1,
The upper cylinder,
A space portion spaced apart from the outer cylinder and the inner cylinder;
a passage connected to the space and connected to the outside of the upper cylinder;
Detachable powder molding device of a powder molding press comprising a.
According to claim 2,
Detachable powder molding apparatus of a powder molding press comprising configuring the upper end of the upper cylinder and the base plate to be assembled by means of bolts.
According to claim 4,
The outer circumferential surface of the body of the piston and the inner circumferential surface of the adjuster are coupled in a screw manner,
The detachable powder molding apparatus of the powder molding press, comprising an adjustment nut that is in contact with the outer circumferential surface of the adjuster is also screwed together.
According to claim 2,
Detachable powder molding apparatus of a powder molding press comprising a core extending from the inside of the lower punch provided at the center of the die plate of the lower press mold to the elevating plate side.

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