KR101184586B1 - Drawing method for forging and apparatus thereof - Google Patents

Abstract

PURPOSE: A method and an apparatus for pre-processing a material when manufacturing a yoke by forging are provided to pre-process a round rod type material to a volume similar to the end-product by reducing both end portions of the material. CONSTITUTION: A method for pre-processing a material when manufacturing a yoke by forging comprises the steps of: striking both end portions of a round rod type material(10) first and turning both end portions of the material by 90° and striking secondly so that the cross section of the central portion of the material increases while those of both end portions of the material decrease. An apparatus for embodying the pre-processing method a lower die(110) and an upper die(120) which strike both end portions of the material and a mounting part(130) which is protruded from the upper center of the lower die and supports the material. Holding grooves are formed at side edges(131) of the mounting part and inner edges(111) of the lower die contacting the side edges of the mounting part. The mounting part is reciprocated up and down by a guide(135) and a guide groove(115). A compressive spring(140) is embedded in the lower side of the mounting part.

Description

Method for pretreatment of material for manufacturing yoke by forging and apparatus for performing the same {Drawing method for forging and apparatus

The present invention relates to pretreatment of a forging material, and more specifically, both ends of the rod are pretreated before forging the material of the round bar, thereby preventing the occurrence of an unfilled phenomenon during forging and loss of material (LOSS). A pretreatment method and apparatus for reducing the

The yoke is a casting product that is assembled between the track adjustment spring of the excavator undercarriage and the idler as shown in FIG. When the yoke was produced as a casting, grinding work due to appearance defects was added, the defect rate was nearly 10%, and the delay of delivery time was continuously generated. Therefore, research was conducted to produce the yoke by forging rather than casting.

As forging, as is well known, the material is put into a mold and then molded into a desired shape to be produced.

When explaining the outline of the forged product, as shown in Fig. 2, the groove shape is inserted into the A part, but the shape is changed to the shape that can be forged, and when the B dimension is produced by casting, it is completed by processing one side 2mm as the appearance defect. However, by changing the forging to remove the surface defects eliminated the machining process. In addition, the strength of the castings has been increased, and the margin of processing can be reduced by about 1.3 times. In other words, even if the shape is reduced as shown in the C line of Figure 2 is not a problem in strength (strength increase as a result of the strength test), thereby reducing the weight of about 1.0Kg is possible.

However, some problems have arisen in the forging of yokes.

Referring to FIG. 3, when the cross-sectional area of the cross section of the forged yoke cut based on the line segments A to F is examined, it can be seen that the sharp increase increases to A to K and decreases rapidly to K to F.

That is, as shown in the product cross-sectional area change graph, (A) is a cross-sectional graph of the raw material φ110, (B) is a cross-sectional graph of the product. There is a high possibility that the phenomenon occurs, and (d) where the cross-sectional area of the material is larger than the cross-sectional area of the product, the amount of the material is sufficient, so that the unfilled phenomenon does not occur, but the material loss (LOSS) is increased.

The present invention has been made in order to solve the above problems, before inserting the material of the round bar and forging only the both sides of the round bar to increase the cross-sectional area of the center portion and reduce the cross-section of both parts similar to the volume of the final product The present invention provides a method for pretreating a forged material and an apparatus for performing the same.

The present invention to solve the above problems,

As a pretreatment process for forging the yoke assembled between the track adjustment spring of the lower part of the excavator and the idler by forging using the rod material, first hit both ends of the rod material and then rotate it 90 ° to hit the second end again. The center portion of the material to increase the cross-section, both ends to provide a method for pre-processing the material during the production of the yoke by forging, characterized in that the cross section is reduced.

Further, according to the present invention,

In the pretreatment apparatus which is performed on the material before forging in order to prevent the unfilled and the loss of both ends (LOSS) in the forging when the center portion is cross-sectional area and both ends are small forging using a round bar material,

The pretreatment device,

The lower mold and the upper mold provided to strike both ends of the material, and the upper portion of the lower mold provides a device characterized in that it includes a seating portion projecting to support the material to be elastically supported in the center.

At this time, a concave locking jaw is formed at both side edges of the seating portion and the inner edge of the lower mold in contact with the seating portion to prevent the material from being moved left and right when the material is hit.

In addition, the inside of the lower mold is reciprocating up and down by the seating portion, the guide and the guide groove, it is preferable that the compression spring is built on the lower surface of the seating portion.

As described above, the pretreatment process according to the present invention can be usefully applied to products having a large change in cross-sectional volume of the product, and thus more material can be added to the section (central part) where the volume of the round bar is insufficient compared to the volume of the forged product. In addition, it is possible to input a small amount of material in the section (both ends) where the volume of the round bar material is larger than the volume of the forged product, thereby improving unfilled material due to lack of material volume and preventing material loss (LOSS).

The pretreatment apparatus according to the present invention has the advantage of being able to draw both ends at the same time to increase productivity.

1 is a view showing a yoke manufactured by casting and a forged yoke,
2 is a view showing a schematic of a forged product,
3 is a view for explaining the amount of change in the cross-sectional area of the yoke,
4 is a view showing a state of performing a pretreatment process according to the present invention,
5 is a volume graph for each position after performing the final pretreatment process of FIG.
6 is a view showing a pretreatment apparatus according to the present invention,
FIG. 7 is a side view of the pretreatment apparatus of FIG. 6;
8 is a view showing a state in which the raw material is put into the pretreatment apparatus of the present invention the first blow, and
9 is a view showing a state to prepare the second blow by rotating the first blow material 90 °.

Hereinafter, with reference to the accompanying drawings will be described a method for pre-processing the raw material in the production of yoke by forging according to a preferred embodiment of the present invention and an apparatus for performing the same.

In the method of pretreatment of the material according to the present invention, both parts of the round bar are rotated twice in a 90 ° direction to increase the cross section of the central part and to reduce the cross section of both parts to be similar to the volume of the final product.

That is, as shown in Fig. 4, the first ends of both ends of the round bar material are rotated by 90 °, and then both ends of the material are secondarily forged again. After the second forging, the product length is similar to the final product length, and the dimensions of FIG. 4 (A) are set similar to the dimensions of the products (dimensions of FIG. have. As a result of the cross-sectional examination, the cross-sectional area of the final product was similar to improve the unfilled problem. That is, in Figure 5, white is the graph of the original material, black is the volume graph of the forged product, blue is the volume graph improved through the secondary development, the volume after the second forging compared to the volume of the raw material It can be seen that both ends are reduced and the center is increased.

The following describes an apparatus for effectively performing the above pretreatment process.

The pretreatment apparatus according to the present invention is operated by hitting both ends of the round bar at the same time, it is configured to be easy to flip the round bar.

6 and 7, the pretreatment device 100 is composed of a lower mold 110 on which the material 10 of the round bar is placed, and an upper mold 120 hitting the raised material 10, and a lower mold 110. The center portion of the) is elastically supported at the bottom is coupled to the mounting portion 130 protruding to the upper side of the lower mold (110). The lower mold 110 and the upper mold 120 have compression spaces formed at both ends thereof to strike the flat material, and a free space is formed at the center of the lower mold 110 and the upper mold 120 so that both sides of the material are compressed. When pressed, the compressed material was collected toward the center.

Round rods are heavy and have a long length, making it difficult to move or forge the forging forceps. To hit each of the two sides of the round bar, it is difficult to hold and support by forceps when hitting one side, and rotate 180 ° to hit the opposite side, which reduces productivity and increases worker fatigue. Therefore, the present invention has developed a device that can hit both sides of the material at the same time, after putting the round bar material.

In addition, even when hitting both sides of the material at once, it should be turned back 90 °. After the first forging, both ends of the material are flat as shown in Fig. 4, and the ends are formed to protrude more than the diameter of the material. When placed on the lower mold 110 of the plane is a problem that can not take the correct posture by the primary hitting portion.

In order to solve these problems is the seating portion 130 coupled to the central portion of the lower mold (110). The seating portion 130 is projected to support the center portion of the material to float the material from the lower mold, the lower portion is elastically supported so that the upper mold 120 comes down to hit the material as shown in FIG. ) Is also pressed into the lower mold 110 by the force. Of course, if the upper mold 120 is raised after the blow is completed, as shown in FIG. 9, the seating portion 130 also naturally protrudes upward again to lift the material 10 from the lower mold.

The seating unit 130 is coupled by the guide groove 115 and the guide 135 inside the lower mold 110, and the compression spring 140 is built on the lower surface of the seating unit 130. And both sides edge 131 of the seating portion 130 and the inner edge 111 of the lower mold 110 in contact with the corner 131 is formed with a locking jaw recessed downwards so that the material 10 is hitting left and right This prevents it from being moved. Of course, the locking step is also formed in the upper mold (120).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined by the appended claims. .

10: material
100: pretreatment device 110: lower mold
115: guide groove 120: upper box
130: seating unit 135: guide
140: compression spring

Claims (4)

As a pretreatment process for forging a yoke assembled between the track adjusting spring of an excavator lower driving body and an idler using a round bar forging, first hitting both ends of the round bar material, and then rotating it by 90 ° to reconnect both ends. The pretreatment method of the material during fabrication of the yoke by forging, characterized in that by hitting the center of the material to increase the cross section, both ends to reduce the cross section. When the center has a large cross-sectional area and both ends have a small cross-sectional area, the pretreatment of the material is performed before forging to prevent unfilling and loss of both ends when the product is forged using the round bar material 10. In the apparatus,
The apparatus comprises:
While compressing both ends of the material 10 in the center of the lower mold 110 and the upper mold 120 provided with a free space, and protrudes to be elastically supported in the center on the upper surface of the lower mold 110 to support the material 10 Concave engaging jaw is formed in the inner edge 111 of the lower mold 110 in contact with the both side edge 131 of the mounting portion 130 and the mounting portion 130, the inside of the lower mold 110 The seating unit 130 is vertically reciprocated by the guide 135 and the guide groove 115, and the compression spring 140 is built on the lower surface of the seating unit 130, characterized in that the pre-treatment device. delete delete

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