KR101880293B1 - manufacturing device for sintered product and method for taking out thereof - Google Patents

Abstract

The present invention relates to an apparatus for manufacturing a sintered product, and a method for extracting the same. More specifically, the present invention relates to an apparatus for manufacturing a sintered product, and a method for extracting the same, wherein the apparatus allows a sintered product, including a protruding unit of which any one surface protrudes in the height direction, to be temporarily supported by a stepped protruding unit protruding from a center core while a lower punch moves down in the process of extraction when the sintered product is molded so that the protruding unit can be detached from the lower punch. Moreover, the apparatus comprises: a die (200); an upper punch (300); a lower punch (400); and a center core (500).

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a sintering-

The present invention relates to an apparatus and a method for manufacturing a sintered molded product, and more particularly, to a method of manufacturing a sintered molded product, which comprises a protruding portion formed by protruding a certain region of a surface in a height direction, A sintered molded product manufacturing apparatus and a drawing method in which a protruding portion and a lower punch can be separated by allowing a sintered molded product to be temporarily supported by a step portion protruding from a core.

Generally, sintering refers to a phenomenon in which a powder body (powder body) molded in a suitable shape through pressurization or the like is tightly adhered to a side surface while being heated at a high temperature to be solidified. Ceramic sintering, metal powder sintering, sintering of a mixture thereof, and the like.

Compared with conventional casting or roll forming, the sintering molding using the double metal powder can improve the precision while the process is simple, and the sintering molding is widely used in high-precision products in recent years because of its light weight and durability.

The sintering method as described above includes a mixing step of adding a solid lubricant to the metal powder so as to provide ease of formation and easiness of demoulding, a molding step of making the mixed powder by using a metal mold in a desired shape, A sintering process for imparting physical properties by applying heat to make chemical bonding by atomic diffusion between the powder particles formed in the forming process, a shaping process for re-pressing to improve the overall precision by correcting deformations that may occur in the sintering process, It is completed with a processing step of processing the precise dimensions of the product after the process and other post-processing to improve the quality after processing.

Related patents are disclosed in Korean Patent Laid-Open Publication No. 2009-0105385 (published on October 10, 2009, entitled "Sintering Molding Method Using Molding Process").

However, the general sintering process can be applied only to products having a simple shape, and when the shape of a product is complicated, it is difficult to uniformize the density and there is a limit in that it is difficult to withdraw after completion.

Particularly, as shown in Fig. 2, in the product in which protrusions are protruded in the lower or upper part of the area, protrusions are embedded in the upper or lower punches during the sintering process, so that even after the dies are separated, No product molding was possible.

Accordingly, there is a need to develop a sintering molding method and apparatus capable of forming various sophisticated forms of sintered product and drawing the sintered product manufactured thereby.

Korean Patent Laid-Open No. 2009-0105385 (published on October 10, 2009, entitled "Sintering Molding Method Using Molding Process")

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a sintered compact which can be easily drawn out of a sintered product, A product manufacturing apparatus and a withdrawing method.

More specifically, it is an object of the present invention to provide a method of sintering a sintered molded product, which comprises a protruding portion formed by protruding a certain region of a surface in a height direction, The present invention also provides a sintering-molded product manufacturing apparatus and a draw-out method in which a protruding portion and a lower punch can be separated by allowing a molded product to be temporarily supported.

The sintering-molded product manufacturing apparatus and the draw-out method according to the present invention are characterized in that a sintered molded product (100) comprising a through hole (110) formed through the center in the axial direction and a protrusion (120) (200) having an inner circumferential surface corresponding to an outer surface portion of the sintered formed article (100); An upper punch 300 formed in a shape corresponding to an upper side of the sintered formed product 100 and applying pressure from the upper side to the lower side; A lower punch 400 formed in a shape corresponding to a lower side of the sintered formed product 100 and applying pressure in a direction from the lower side to the lower side; And the through hole 110 is formed in the center of the upper and lower punches 300 and 400 so that the upper surface of the lower punch 400 and the protrusions 120 of the sintered molded product 100 are separated from each other. A center core 500 having a step portion 600 protruding outward in an area corresponding to a position where the lower surface contacts; And a control unit.

At this time, the lower punch 400 may be a single number of flow punches movable in the vertical direction.

In addition, the step portion 600 serves to temporarily support the sintered molded product 100 when the lower punch 400 descends to withdraw the sintered formed product 100.

The method of drawing the sintered molded product 100 in the above-described apparatus 1 for manufacturing a sintered molded product includes a) an outer surface separation step S100 in which the die 200 is separated; b) upper and lower side separation step (S110) in which the upper punch (300) rises and the lower punch (400) descends; And c) a drawing step (S120) of drawing the sintered molded product (100) by the drawing means while the center core (500) is lowered; And a control unit.

At this time, the sintered molded product 100 is pulled out from the sintered molded product 100 until the lower side of the sintered molded product 100 is separated in the upper and lower side separation steps, May be temporarily supported by the step portion 600 of the center core 500.

The sintering-molded product manufacturing apparatus and the drawing method according to the present invention are advantageous in that the sintering-molded product can be easily drawn out regardless of the shape of the product, and various complicated shapes can be molded.

Particularly, the present invention relates to a sintered molded product, which is formed by a step portion formed on a center core when the lower punch is lowered during a drawing process, in which the sintered molded product includes protrusions formed by protruding a certain region of a surface in a height direction, So that the protrusion and the lower punch can be separated from each other, thereby making it possible to perform a sintering process on a product which has not been previously formed into a sintering furnace.

More specifically, in the case where protrusions are formed on a certain region of a surface in the height direction of a product to be molded, it is difficult to form the sintered body because it is not separated from the upper punch or the lower punch. When the lower punch is lowered by using the flowing punch, the lower punch and the protruding portion can be separated easily by allowing the stepped portion to temporarily support the lower end portion of the sintered molded product.

Accordingly, the present invention can improve the durability of a molded product by manufacturing a sintered product of a product which was conventionally manufactured by die casting.

In addition, the present invention has an advantage that it can be applied to all kinds of products regardless of the presence of cores, thereby diversifying application products.

1 is a schematic longitudinal sectional view showing an example of the conventional sintering apparatus.
2 is a perspective view showing an example of a sintered formed product to be produced.
3 is a schematic longitudinal sectional view showing an embodiment of an apparatus for producing a sintered molded article according to the present invention.
4 is a perspective view showing a longitudinal section of an embodiment of the apparatus for producing a sintered molded article according to the present invention.
FIG. 5 is a partially exploded perspective view showing a longitudinal section of the apparatus for manufacturing a sintered product of FIG. 4;
6 is a perspective view showing a center core in the apparatus for producing a sintered molded product of Fig.
Fig. 7 is a longitudinal sectional view showing the apparatus for producing a sintered molded article of Fig. 4; Fig.

Hereinafter, an apparatus for manufacturing a sintered molded product and a drawing method according to the present invention will be described in detail with reference to the accompanying drawings.

The present invention relates to an apparatus and a method for manufacturing a sintered molded product which can be easily drawn out of a sintered product regardless of the form of the product and can form various complex products. A sintered molded product manufacturing apparatus and a drawing method thereof for producing a sintered molded product requiring a center core will be described. In Examples 3 and 4, sintered molded product manufacturing apparatuses The molding product manufacturing apparatus and the drawing method thereof will be described below.

Example 1.

Example 1 is directed to an apparatus for manufacturing a sintered formed product 100 from a powder body, which includes a through hole 110 formed in the center thereof in an axial direction and a protrusion 120 protruding downward from the lower side, And includes a die 200, an upper punch 300, a lower punch 400, and a center core 500.

First, the die 200 has an inner circumferential surface corresponding to the outer surface of the sintered formed product 100 to be manufactured, and the upper punch 300 has a shape corresponding to the upper surface of the sintered formed product 100 And acts to apply pressure from the upper side to the lower side.

Next, the lower punch 400 is formed in a shape corresponding to the lower side of the sintered formed product 100, and presses the lower punch 400 upward from the lower side. That is, the lower punch 400 is formed with the region corresponding to the protrusion 120 being embedded inward.

Particularly, in the apparatus 1 for manufacturing a sintered compact product of the present invention, the center core 500 is inserted into the center of the upper punch 300 and the lower punch 400 to form the through hole 110, A step portion 600 is formed in which the upper surface of the lower punch 400 and the lower surface of the protruding portion 120 of the sintered molded product 100 are in contact with each other.

At this time, the lower punch 400 uses a single number of moving punches that can move in the vertical direction.

Conventionally, a die 200 casting process was generally used to produce products of the type shown in FIG.

1, the lower punch 400 'is a fixed punch, so that the upper punch 300' and the die 200 'are separated from the lower punch 400' Next, a force is applied from the side of the product to withdraw.

However, in the case where there is a protrusion protruding downward, when the protrusion is pulled out by applying a force from the side as described above, the protrusion is separated or partially damaged, and no withdrawal is made.

Therefore, in the present invention, the lower punch 400 can be separated from the lower side by using a floating punch. In order to separate the lower side punch 400 from the lower side of the product after the upper punch 300 and the die 200 are separated from each other, the lower punch 400 must be a floating punch, Only the lower punch 400 moves downward so that the lower side of the product and the lower punch 400 can be separated.

For this purpose, in the present invention, when the lower punch 400 is lowered to withdraw the sintered formed product 100, the center core 500 is provided with a stepped portion (not shown) so that the sintered molded product 100 can be temporarily supported. (600).

The stepped portion 600 is formed so as to protrude outwardly from the center core 500 to temporarily support the sintered formed product 100. The protruded portion 600 may be formed so that the protrusion height is not large enough to change the shape of the product itself .

3 to 5, an apparatus 1 for manufacturing a sintered compact product according to the present invention will be described in detail.

The present invention relates to a sintered formed product 100 to be manufactured, a die 200 formed to correspond to the outer circumferential surface of the sintered formed product 100, a lower punch 400 formed to correspond to a lower side of the sintered molded product 100, And a center core 500 inserted into the center of the upper punch 300 and the lower punch 400 so that the upper punch 300 and the through hole 110 are formed, The powder charged into the space formed by the core 500 and the lower punch 400 is introduced and the powder is formed so that the powder can be pressed by the up and down movements of the upper punch 300 and the lower punch 400.

At this time, the upper punch 300 and the lower punch 400 are formed to move in the height direction through the inside of the die 200 along the center core 500. Therefore, a portion of the upper punch 300 and the lower punch 400 is formed so that the inner diameter and the outer diameter of the die 200 are equal to or smaller than the outer diameter of the die 200, do.

Example 2.

Example 2 is a device for manufacturing a sintered formed product 100 comprising a through hole 110 formed through the center in the axial direction and a protrusion 120 protruding downward from the lower side, (100).

Before describing the drawing method of the sintered formed product 100, the entire process of the sintering method will be briefly described.

The sintering method includes a mixing step of adding and mixing a solid lubricant oil for ease of shape shaping and ease of mold release to various metal powders such as iron (Fe) powder, copper (Cu) powder and alloy powder to be sintered, A molding step of injecting the mixed powder into a metal mold having a desired shape and then applying pressure to the metal mold; and a step of applying heat to the powder formed in the molding step by applying heat to make chemical bonding by atomic diffusion between the powder particles, A squeezing step, a squeezing step of squeezing the squeeze step so as to improve the overall precision by correcting deformation due to dimensional deformation or warping which may occur in the sintering step, and improving the quality and durability of the drawn product through the shaping step And a post-treatment process such as heat treatment, finishing and coating treatment.

As described above, when the sintered molded product 100 is taken out through the sintering process and the shaping process, the present invention is subjected to the outer surface separating step, the upper and lower side separating step and the drawing step.

First, in the outer surface separation step, the outer surface of the sintered molded product 100 and the inner surface of the die 200 are separated.

Next, in the upper and lower side separation steps, the upper punch 300 rises to separate the upper side, and the lower punch 400 descends to separate the lower side.

At this time, since the lower surface of the sintered molded product 100 is temporarily supported by the step portion 600 of the center core 500, the lower surface and the lower punch 400 can be separated from each other.

Then, in the drawing step, the center core 500 descends and the sintered molded product 100 is taken out by the drawing means such as a robot arm.

The present invention uses a floating punch as the lower punch 400 and allows the lower jaw 600 to temporarily support the lower end of the sintered formed product 100 when the lower punch 400 is lowered Accordingly, the lower punch 400 and the protrusion 120 can be easily separated from each other.

Accordingly, the present invention can improve the durability of a molded product by manufacturing a sintered product in the form of a product that was conventionally manufactured by die casting.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It goes without saying that the modification can be carried out.

1: Sintering molding product manufacturing apparatus
100: Sintered products
110: through hole 120: protrusion
200: die
300: upper punch
400: Lower punch
500: Center core
600: Short jaw

Claims (5)

1. An apparatus for manufacturing a sintered formed product (100) from a powder body, the apparatus comprising: a through hole (110) formed through the center in an axial direction; and a protrusion (120) protruding downward from a lower side,
A die 200 having an inner circumferential surface corresponding to an outer surface of the sintered formed product 100;
An upper punch 300 formed in a shape corresponding to an upper side of the sintered formed product 100 and applying pressure from the upper side to the lower side;
A lower punch 400 formed in a shape corresponding to a lower side of the sintered formed product 100 and applying pressure in a direction from the lower side to the lower side; And
A center core 500 inserted into the center of the upper punch 300 and the lower punch 400 to form a through hole 110 of the sintered formed product 100; Lt; / RTI >
The lower punch 400 is formed of a single number of flow punches movable in the vertical direction so that the upper punch 300 and the die 200 are separated and then the lower side of the sintered molded product 100 and the lower punch 400 ) Can be separated,
The center core 500 is provided with a step portion 600 having an area corresponding to a position where the upper side of the lower punch 400 and the lower side of the protrusion 120 of the sintered molded product 100 are in contact with each other, Formed,
The step portion 600 is formed to be inclined so as to connect the outer circumferential surface of the center core 500 in contact with the inner circumferential surface of the sintered formed product 100 and the outer circumferential surface of the center core 500 in contact with the inner circumferential surface of the lower punch 400 The sintered molded product 100 is temporarily passed through the step portion 600 when the lower punch 400 separates from the lower side of the sintered molded product 100 and descends to withdraw the sintered molded product 100. [ And,
Wherein the lower punch (400) and the protrusion (120) of the sintered molded product (100) can be easily separated from each other.
delete delete A method of drawing a sintered formed article (100) in an apparatus (1) for manufacturing a sintered molded article according to claim 1,
a) an outer surface separation step (S100) in which the die (200) is separated;
b) upper and lower side separation step (S110) in which the upper punch (300) rises and the lower punch (400) descends; And
c) a drawing step S120 of drawing the sintered molded product 100 by the drawing means while the center core 500 is lowered; (100). ≪ / RTI >
5. The method of claim 4,
The sintering molded product (100) withdrawing method
The sintered molded product 100 is separated from the step portion 600 of the center core 500 until the lower side of the sintered molded product 100 is separated in the upper and lower side separating steps, (100). ≪ RTI ID = 0.0 > 11. < / RTI >

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