KR100614211B1 - Forging device using retractable mold - Google Patents

Abstract

Disclosed is a forging apparatus in which an opening and closing mold is used to forge a product having a reverse gradient shape or a waist-closed shape and then take out the product. The forging device using an openable mold according to the present invention includes a bolster, a mold part and a knockout device. The mold part is placed in the upper part of the bolster, and the upper part is formed on the inclined surface of the main lower mold and the main lower mold which is inclined to the inside, and is divided into a plurality of lower molds having a divided lower mold which is opened and closed by moving up and down. It is made up of an upper mold which is disposed on the upper side and pressed between the lower molds and forging a product. On the other hand, in addition to having a conventional structure, the knockout device further includes a takeout part and a holding part. The take-out part is disposed between the bolster and the mold part to push each divided mold and product upwards. And the holding part has a structure which temporarily suppresses the fall of the extraction part.

Description

Forging device using a open and shut type mold}

1 is a view showing a mold in the forging apparatus according to the prior art,

Figure 2 is a view showing a knockout device in the forging apparatus according to the prior art,

Figure 3a and 3b is a view showing a product of the shape of the waist narrow and back gradient was difficult to take out in the forging device according to the prior art,

Figure 4 is a view showing the working sequence of the forged product molded by the forging apparatus according to the prior art,

5 is a cross-sectional view showing a forging apparatus according to the present invention,

6 is a view showing in detail the mold portion shown in FIG.

7 is a plan view of the lower mold shown in FIG. 6 as viewed from above;

8 is a view showing the working sequence of the forged product molded by the forging apparatus according to the present invention,

9 is a view showing an operating state of the mold portion, and

10 is a view showing an operating state of the forging apparatus according to the present invention.

<Explanation of symbols for the main parts of the drawings>

100: forging device using the closing mold

110: bolster 120: mold part

122: main lower type 124: slope

126: internal lower type 128: center lower type

130: split bottom type 134: first compression spring

140: Main Pictograph 142: Center Pictograph

150: blowout part 152: lever

154a, 154b: knockout pin 156: second compression spring

160: holding part

The present invention relates to a forging apparatus, and more particularly, a product which cannot be taken out by a conventional forging die, that is, a reverse gradient shape or a product having a waist shape, is divided so that the product can be taken out after forging molding. It relates to a forging apparatus in which a closed retractable mold is used.

In general, forging is one of the oldest metal processing processes, a method of forming by applying a compressive load to the metal material. A simple forging process is performed using heavy hand hammers and anvils, as traditionally done in a smithy, but most forging is done using mold sets, forging presses or mechanical hammers and associated equipment. Through the forging operation, the flow and particle structure of the metal material can be controlled, and the forging has excellent strength and toughness. Therefore, forged parts are used for stress applications that are severely stressed, such as landing gear, jet engine parts, and automobile parts, such as spindles, caps, special gears, crankshafts, and connecting rods. It can be used reliably for loads and the like.

Looking at the forging mold according to the prior art, as shown in Figure 1, the mold (1) is a lower mold (2) produced by looking at the lower shape of the product to be molded, and the upper mold of the lower mold (2) It consists of an upper mold (3) manufactured by modeling the upper shape. And a knockout pin which is selectively bounced through the lower portion of the lower mold 2 to take out the molded product.

At this time, the knockout pin is operated by the knockout device 10 installed on the lower side and the side of the bolster (Bolster, 5) on which the forging die 1 is placed, as shown in FIG. The knockout device 10 is connected to the cam shaft 12 that is rotated, the rod portion 14 which repeatedly moves up and down by the rotation of the cam shaft 12, and the rod portion 14 while being connected to the lower portion of the rod portion 14. It consists of the exercise transmission part 20 for moving the knockout pin 4 up and down by the up and down reciprocating motion of (14). In more detail, the rod part 14 is coupled to the pivot table 16 which is pivoted up and down by the rotation of the cam shaft 12, and the connecting rod which is coupled to the end of the pivot table 16 to reciprocate up and down ( 18). First, the exercise transmission unit 20 has a shape of "a" while one end is coupled to the first end of the connecting rod 18 and the long axis coupled to the other end of the first link 22 ( 24) and a pair of second links 26 having a "-" shape and the other end coupled to the middle and end portions of the long axis 24, and coupled to one end of each second link 26. While being made of a plate-shaped up-down bar 28 is connected to the knockout pin (4) on the upper surface.

In the knockout device 10, when the cam shaft 12 is rotated, the turning table 16 and the connecting rod 18 move upward, and the first link 22 connected to the connecting rod 18 rotates clockwise. The long axis 24 is horizontally moved toward the first link 22 by the first link 22, and each second link 26 is connected to the first link 22 in accordance with the movement of the long axis 24. Similarly rotated clockwise, up-down bar 28 and knockout pin 4 coupled to one end of each second link 26 rise upwards.

In such a forging apparatus, when a material is pressed between a pair of molds having a space of a desired shape, the material is deformed to the shape of the mold only in the space of the mold. This processing method is a method applied to mass production, and has high dimensional accuracy and can be molded quickly.

On the other hand, looking at the forging method using the forging device, as shown in Figure 3a to produce a product (A) having a narrow waist shape can be manufactured through the process as shown in Figure 4 to produce a finished product. That is, the material 30 of the round bar or each bar is prepared, and the prepared material 30 is upset to form the yellow state 31, and the finish state of the yellow state 31 is formed by a blocker mold. Trimming to easily form a blocker (32), the molded article of the blocker (32) to a finisher (33), and to remove the flash generated in the finish 33 molding process ( Trimming) (34) work, and then to process the waist portion 35 to have the same shape as the finished product (A) (35).

However, it can be seen that in the above-mentioned conventional forging method, if only the trimming operation is performed by molding the product of the yellow state into the same shape as the finished product in the mold, the waste of manpower, time, and materials is significantly reduced. However, in the forging dies currently in use, such a forging can be performed, but cannot be performed due to the difficulty in the take-out step after molding. That is, even if it is possible to form a product with a narrow waist or a back-graded shape like the product shown in FIGS. 3A and 3B, it cannot be taken out, so the blocker process of the rough shape is selected before molding the finished product. After the work, it was necessary to process the finished product again.

The present invention has been made to solve the conventional problems as described above, the object of the present invention is the forged molding of the product of the inverse gradient (逆 勾 配) shape or narrow waist shape divided after opening and closing to enable the extraction of the product A forging apparatus in which a mold is used.

Still another object of the present invention relates to a forging apparatus capable of discharging a molded product between molds by suppressing the fall of the knockout pin for a predetermined time after the knockout pin is raised.

In order to achieve the above object, the present invention,

Bolsters; It is settled on the upper part of the bolster and placed on the inclined surface of the main lower mold and the main lower mold which are inwardly sloped inward, and is divided into a plurality of lower lower molds which are formed by the vertical movement, and are arranged on the upper part of the lower mold. A mold part made of an upper mold pressed between the lower mold and forging a product; And a knockout device having a bolster knockout pin disposed between the bolster and the mold part to penetrate the ejection part for pushing each of the divided lower molds and the product upward, and a bolster knockout pin for selectively pushing the ejection part upward. In

After the bolster knockout pin is raised, it is formed at the lower end of the connecting rod which vertically reciprocates in the knockout device to suppress the fall temporarily, and consists of a cylinder which suppresses the falling of the connecting rod and a timer for adjusting the operation time of the cylinder. The holding part further includes a first compression spring disposed at each contact portion of the divided lower die, and a blowout portion includes a knockout pin extending toward the divided lower die side, a "+" shaped lever coupled to a lower end of each knockout pin; It provides a forging device using an openable mold, characterized in that the second compression spring is fitted to each knockout pin.

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Hereinafter, a forging apparatus using an openable mold according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

5 is a cross-sectional view schematically showing a forging apparatus according to the present invention, FIG. 6 is a detailed view of a mold part shown in FIG. 5, and FIG. 7 is a plan view of the lower mold shown in FIG.

Referring to FIG. 5, the forging apparatus 100 according to the present invention includes a bolster 110, a mold part 120, and a knockout device 10. Preferably, the mold unit 120 is placed on the upper portion of the bolster 110, and the knockout device 10 is formed on the side and the lower portion of the bolster 110.

6 and 7, the mold part 120 is largely divided into a lower mold and an upper mold, and in more detail, the lower mold is a main lower mold 122, an inner lower mold 126, a center lower mold 128, and a divided lower mold 130. The upper mold is divided into the main upper mold 140 and the center upper mold 142. The main lower mold 122 has a shape penetrated up and down so as to be placed inside the bolster 110 while other molds are placed therein. An inner upper portion of the main lower die 122 has a predetermined angle in the downward direction, and a non-egressed inclined surface 124 is formed. The inner lower mold 126, the center lower mold 128, and the divided lower mold 130 are disposed inside the main lower mold 122 formed as described above.

The inner lower mold 126 is disposed at a position from an inner lower end to a central portion of the main lower mold 122, and is placed on the upper portion of the bolster 110 like the main lower mold 122. The center lower mold 128 is fixedly disposed inside the inner lower mold 126 again. Preferably, the upper surface of the lower center die 128 is formed to match the lower shape of the product to be forged.

The divided lower mold 130 is disposed above the inner lower mold 126 in a state where a plurality of divided molds 130 are divided. In the preferred embodiment of the present invention, the divided lower die 130 is set to four, but in some cases, it may be set to three or more. The outer surface of each of the divided lower mold 130 has an inclined surface 132 opposite to the inclined surface 124 of the main lower mold 122 so as to radially outward or radially inward along the inclined surface 124 of the main lower mold 122. It moves while it opens and closes. In addition, a first compression spring 134 for pushing each of the divided lower molds 130 is fitted into a contact portion where the divided lower molds 130 abut each other. In addition, the inner surface of the divided lower mold 130 is formed to match the outer surface of the product to be molded. The upper mold is disposed above the lower mold thus formed.

The upper mold is divided into the main upper mold 140 and the center upper mold 142 as described above. The main upper mold 140 is disposed above the divided lower mold 130. At this time, the outer side on the lower surface of the main upper die 140 is formed in contact with the upper surface of the divided lower die 130 to match the shape of the lower die 130, the central portion on the lower surface of the main upper die 140 It is formed to coincide with the upper surface of the. The center mold 142 is disposed at the center of the main mold 140. The center die 142 is firmly fixed to the inner central portion of the main die 140, and is formed to match the shape of the center on the upper surface of the product to be molded.

Referring to FIGS. 5 and 6 again, the knockout device 10 includes a cam shaft 12 that is rotated as described in the related art, and a rod portion 14 that moves up and down reciprocally by rotation of the cam shaft 12. And the forward and backward reciprocating motion of the exercise transmission part 20 and the forward and backward reciprocating motion of the rod transfer part 14, and the forward and backward reciprocating motion of the rod part 14 again. Consists of the switch bolster knockout pin (4), and further disposed on the upper portion of the bolster knockout pin (4) to operate the take-out portion 150 and the knockout device 10 formed in the inner lower portion of the inner lower mold (126) It is further provided with a holding unit 160 to suppress.

The ejection part 150 includes knockout pins 154a and 154b, a lever 152, and a second compression spring 156. The knockout pin 154a is screwed to the lower portion of each of the divided lower molds 130 and extends to the inner lower portion of the inner lower mold 126, and a lever 152 is disposed at the lower end of each knockout pin 154a. The lever 152 has a "+" shape so that four knockout pins 154a are placed on the top surface. At this time, the second compression spring 156 is disposed on each knockout pin 154a. In addition, another knockout pin 154b is seated in the center of the lever 152 to penetrate the center of the lower center die 128 and extend between the molds to the side of the product to be molded.

The holding part 160 is formed at the lower end of the rod part 14. That is, the holding portion 160 is formed in the lower portion of the connecting rod 18 in the rod portion 14, in this case, the holding portion 160 used is a cylinder that is operated by air or hydraulic pressure, and the operating time of the cylinder It consists of a timer to adjust.

The following briefly describes the state of use of the forging apparatus using an openable mold formed as described above.

8 is a view showing the operation sequence of the forged product molded by the forging apparatus according to the present invention, Figure 9 is a view showing the operating state of the mold portion, and Figure 10 shows the operating state of the forging apparatus according to the present invention. Drawing.

In the forging device 100 according to the present invention shows a process that can be taken out after molding the product of the reverse gradient shape or the waist portion has been construed as a conventional problem. That is, as shown in Figure 8 when the forging in the forging apparatus 100 according to the present invention using the material 300 and the wild state 310, the finish state 320. The finished product is completed after the trimming operation 330 in the finish state 320. The operation of the forging device 100 proceeds from the rough state 310 to the finish state 320 is as follows.

First, the material of the yellow state 310 is put in the center of the lower mold. At this time, the lower mold is a state in which the divided lower mold 130 is placed on the upper portion of the inner lower mold 126. The upper mold is pressed in the lower mold direction at the top of the material placed. As the material is pressed by the upper mold, the lower surface of the material is formed in the same shape as the upper surface of the center lower mold 128 and the divided lower mold 130, and the upper surface of the material is formed of the main upper mold 140 and the center upper mold 142. It is formed in the same manner as the lower surface. When the molding is completed, as shown in FIG. 9, the upper mold is separated upward, and the finished product is taken out. At this time, the take-out operation is made by the knockout device (10).

As shown in FIG. 10, the knockout device 10 moves the pivot table 16 and the connecting rod 18 upward while the cam shaft 12 is rotated, and the first link 22 is moved by the movement of the connecting rod 18. ) Is turned, the long axis 24 is moved to the first link 22 side by turning the first link 22, and the second link 26 is turned up and down while the long axis 24 is moved again. (28) and bolster knockout pin (4) lift up. The bolster knockout pin 4 that rises upwards raises the lever 152 disposed on the bolster 110 through the bolster 110 and raises the knockout pins 154a and 154b while the lever 152 is raised. The divided lower mold 130 and the product placed on top of the knockout pins 154a and 154b are raised.

As such, the divided lower die 130 raised by the knockout pin 154a is radially opened along the inclined surface 124 of the non-degraded main lower die 122. At this time, when the divided lower mold 130 is opened radially upward, the upper portion of the knockout pin 154a should be inclined along the divided lower mold 130. Therefore, on the inner side of the inner lower mold 126, it is preferable that a play 127 is formed so that each knockout pin 154a can be moved outward by a predetermined distance. In addition, since the first compression spring 134 is disposed between each of the divided lower molds 130, each of the divided lower molds 130 is smoothly opened. In addition, the knockout pin 154b penetrating the center of the lower center die 128 raises the lower portion of the upper portion of the lower die 130 so that the product can be removed from the mold at the same time. When the process up to this point is completed, the finished product must be lifted out. When the cam shaft 12 of the knockout device 10 is rotated further, the knockout pins 154a and 154b are lowered again by their own weight. Because of this, the divided lower mold 130 and the product can be lowered, so that it is difficult to smoothly take out the product. At this time, the holding unit 160 to suppress the falling of the knockout pins (154a, 154b) for a predetermined time is operated. The holding part 160 is installed at the lower end of the connecting rod 18 and is operated at the moment when the connecting rod 18 is raised by the cam shaft 12 to prevent the falling of the connecting rod 18 so that the knockout pins 154a and 154b are provided. Prevent descent. The holding unit 160 operates the cylinder for a predetermined time specified by the timer.

When the extraction is completed, the holding unit 160 is released and the divided lower die 130 descends while the knockout pins 154a and 154b descend. At this time, the divided lower mold 130 descends while descending as opposed to ascending and descending radially, the lower of the divided lower mold 130 is also lowered by its own weight by its own weight, but knockout pins (154a) for a more reliable home position It is doubled by the expansion force of the second compression spring 156 mounted to the.

As described above, the forging device using the open-close mold according to the present invention has a configuration that is opened and closed according to the movement of the upper and lower while dividing the lower mold into several, so that the product of the reverse gradient shape or the waist portion is concave There is an advantage that can be forged.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art can be variously modified and changed within the scope of the invention without departing from the spirit and scope of the invention described in the claims You will understand.

Claims (7)

Bolsters; The lower mold having a divided lower mold, which is settled on the upper side of the bolster and is divided into a plurality of pieces while being placed on the inclined surface of the main lower mold and the upper lower slope, which is inclined to an inner side, and the upper lower portion of the lower mold. A mold part disposed on the mold and configured to be pressurized between the lower mold and the upper mold to forge a product; And a knockout device disposed between the bolster and the mold part, the ejection part for pushing each of the divided lower molds and the product upward, and a bolster knockout pin for penetrating the bolster and selectively pushing the ejection part upward. In the forging device comprising a, After the bolster knockout pin is raised is formed on the lower end of the connecting rod for reciprocating up and down in the knockout device to temporarily suppress the falling, and the cylinder to suppress the falling of the connecting rod, the operation time of the cylinder is adjusted It further comprises a holding portion consisting of a timer, the first compression spring is disposed on the contact portion of each of the divided lower die, the take-out portion is coupled to the lower end of the knockout pin and the knockout pin extending to the divided lower die side; A forging apparatus using an openable mold, characterized in that it comprises a "+" shaped lever and a second compression spring fitted to each knockout pin. delete delete delete delete delete delete

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