KR100246676B1 - Sungle type metalic mold with guide bar for hot forging and remaking method thereof - Google Patents

Abstract

The present invention relates to a forging die, and particularly relates to a forging die facility and a mold material recycling with improved efficiency.

The present invention aims to improve the defect rate, increase the work efficiency, and reduce the cost by providing a guide type integrated mold and a method of recycling the mold material to reduce the mismatch of the forging die.

The present invention comprises a mold gouging step of heating the mold part of the mold material worn by the mold and shaving it to a certain degree; a welding embedding step of melting the welding rod to melt the cut part; and processing the buried part to reproduce the mold part. A mold material regeneration method comprising the step of regenerating a mold, and the forging die, which is directly installed on the die-set die without a fixing aid, is reproducible, and is formed with a counterpart having a one-piece molding process. It provides an integrated guide type hot forging die, characterized in that consisting of a pair of bottom.

Description

Mold material recycling method and integrated guide method hot forging mold {SUNGLE TYPE METALIC MOLD WITH GUIDE BAR FOR HOT FORGING AND REMAKING METHOD THEREOF}

The present invention relates to a forging die, and particularly relates to a forging die facility and a mold material recycling with improved efficiency.

The present invention aims to improve the defect rate, increase the work efficiency, and reduce the cost by providing a guide type integrated mold and a method of recycling the mold material to reduce the mismatch of the forging die.

In the related art, a forging method is widely used as a method for producing various mechanical parts.

Such forging is widely used in various parts of automobile parts besides various kinds of spindles, caps, special gears, shafts such as crankshafts, and rods such as connecting rods.

At this time, the conventional forging equipment for forging is widely used a method for hot forging using a mold as shown in Figure 1 to make the workpiece to the desired shape.

The conventional hot forging method shown in FIG. 1 is a mold separation type, wherein the holder 2 is placed on the fixed die set lower mold 1, and the mold material (insert) 3 is inserted into the holder and fastened. And a die-shaped die (not shown) of symmetrical shape is configured in such a manner as to reciprocate up and down by the equipment to process the workpieces sandwiched therebetween.

In such a configuration, the workpiece is forged in three stages, namely, the buster (BU), the sub-locker (BL), and the finish (FI) to form a shape. Finally, the remaining residue of the workpiece is processed through the trimming (4) process. ) And the final product is made.

On the other hand, the die set lower die and the symmetrical die set die are designed to be guided to the exact positions required by the guide rods 5 (5 ') of Fig. 1 so that no defective products are produced.

However, in practical applications, the equipment for reciprocating the die set up and down is shaken and lowered to perform forging work, or the mounting of the guide rods 5, 5 'is not accurate.

In the above case, as shown in FIGS. 2A and 2B, a phenomenon in which the upper mold 3 'and the lower mold 3 of the mold material deviate from each other occurs (Miss-Match). The worse it gets.

In addition, conventionally, when the mold material is used for a long time, the mold material is worn out, the shape is not obvious, and there is a problem that a poor product is formed even in strength and the like.

The cause of this phenomenon is the increase in production and the aging due to the lapse of time, but the mold material (3) is separated for each process, and the mold material is inserted into the holder to independently replace the old mold material. Because

As a result, since only the mold material damaged by each process is replaced and then processed, only a part of the mold material needs to be replaced and other mold materials do not need to be replaced, thereby reducing the mold manufacturing cost.

However, such partial exchange is inefficient because the work is interrupted and the replacement takes a long time due to the difficulty of frequent replacement and separation and replacement between the mold material and the holder, and also has a separate form for each process. There were disadvantages such as an increased mismatch of FIG. 2b.

Therefore, it is required to develop a method that can reduce the mold manufacturing cost even if it is manufactured in one-piece type because it is composed of a new type, so that the occurrence of defective products due to mismatches and the recycling of mold materials is possible.

The present invention is in accordance with the above-described conventional requirements, the hot forging equipment can be easily replaced by the holder and the mold material integrally, and also by the process of manufacturing a defective product due to mismatch by forming an integral type instead of a separate type. Providing a hot forging mold that reduces the possibility and the correction time accordingly, while increasing the operation rate, and at the same time provides a method for recycling the above-mentioned mold material to provide a mold material recycling method that can reduce the mold manufacturing cost. It is technical problem to do.

1 is a schematic configuration diagram of a conventional insert, detachable hot forging die

Figure 2a is a cross-sectional view showing a situation in which a mismatch occurs during the forging operation with a conventional insert, removable hot forging die

2b is a view showing a situation in which a mismatch occurs during a forging operation with a conventional insert and a detachable hot forging die.

2c is a view illustrating a situation in which a mismatch occurs during forging work with a conventional insert and detachable hot forging die, and shows a mismatch situation during trimming.

3 is a schematic configuration diagram of an integrated guide type hot forging die according to the present invention;

4 is a view showing a regeneration process of the mold material used in the integrated guide method according to the present invention.

Explanation of symbols on the main parts of the drawing

1,9: Die set lower type 2: Holder

3: mold (insert) 4, 15: trimming

5,5 ', 14,14': Guide Post 6: Workpiece

7: Processing allowance (Flash) 8: Puncher

10: Mold dies 11: The opponent

12: Insert guide rod 13: Insert guide groove

The present invention is a means for solving the above-described technical problem, a mold gouging step of heating the mold part of the mold material worn by the mold to shave to a certain degree; and the welding landfill step of melting the welding rod to fill the cut out portion; It provides a mold material regeneration method comprising a mold regeneration step of regenerating the mold by processing the buried portion.

Preferably, the present invention provides a method for regenerating a mold material, characterized in that it comprises an annealing step after the welding buried step, and more preferably, the welding rod used in the welding buried step is an Eureka name. 88 # AISI H-19 It provides a mold material recycling method characterized in that the hardness is HRC 55 to 60 and the welding method is MIG or TIG.

In addition, the present invention, in the forging die, is directly installed on the die lower die without a fixing aid, the integral guide system hot forging die, characterized in that the two pieces of the base and the base of the die piece process is composed of an integrated counterpart To provide.

At this time, the present invention preferably provides the integrated guide type hot forging mold, characterized in that the material of the mold is SKD11, or the material is SKT 4 and the hardness is HRC 45 ~ 48.

More preferably, the mold regeneration method includes a mold gouging step of heating a mold part of a mold material of which mold is worn out and shaving it to a certain degree; a welding embedding step of melting the welding rod and melting the welding part; And; Provides an integrated guide type hot forging die, characterized in that using the mold material regeneration method characterized in that it comprises a die regeneration step of processing the buried portion to reproduce the die.

Further, the lower guide and the counterpart of the integrated guide type hot forging die are provided with an integrated guide type hot forging die, wherein guide rods and guide grooves are formed between the respective molding processes.

With reference to the drawings will be described the configuration of the mold regeneration method and the integrated guide type hot forging die according to the present invention.

4 is a diagram showing the configuration of a mold material regeneration method according to the present invention, and is largely composed of three steps.

The first step is the mold gouging step, which is a step of heating the mold material worn out by the mold part over time by about 300 degrees Celsius, and shaving it to a certain degree, and the chipping degree is preferably about 15 to 20 mm.

The second step is to fill out the cut-out part with a welding rod, and it is a landfilling step. EUREKA name 88 # AISI H-19 It is recommended to use the hardness of HRC 55 to 60 and the welding method is MIG or TIG.

It is preferable to set it as the alloy whose specific chemical component is C: 0.04, Mo: 0.45, Mn: 0.35, W: 4.25, Si: 0.30, V: 2.00, Cr: 4.50, Co: 4.25.

The next step is not necessarily a step, but it is good to leave the annealing step, the condition of the annealing is preferably 530 ℃ to 550 ℃ 1HR / Inch.

As a final step, the shape of the shape of the shape is to be formed using the method such as electric discharge machining using the electrode to form the same shape as the first used.

The above steps are as shown in Figure 4, the first step is the mold gouging step, the second is the state of filling the cut out with a welding rod and loosened, and the last step is to rebuild the mold As it is recovered to a state and reused immediately, mold cost can be reduced.

At this time, the electrode is also integrally manufactured to discharge processing can shorten the processing time.

Another configuration of the present invention, the integrated guide type hot forging die will be described with reference to FIG.

The characteristic of the integrated guide type hot forging mold shown in FIG. 3 is that the mold is installed directly on the die set 9 without the holder 2 of FIG. 1 and is distinguished from the insert type. It is.

In the case of the conventional mold, it is preferable to use a separate type for reducing the mold cost, but in the present invention, since the method of regenerating the mold material is used as described above, the conventional detachable type having the disadvantages of mismatch and the like, and the insert type inserting the mold material into the holder. That means you don't have to use it.

In addition, as described above, each process is not separated by process and shape, but also means that a space is formed between the processes.

As a result, the guide rod 12 and the guide groove 13 may be formed in the formed space as shown in FIG. 3.

As a result of the above configuration, the mismatch can be more surely reduced by the formation of the guide groove and the guide rod.

At this time, the position of the guide rod and the groove does not necessarily need to be installed in the middle of the mold materials 10 and 11, and may be provided outside.

In the present invention, by using the forging die as an integral type instead of a separate type as described above, the possibility of mismatch is fundamentally blocked to reduce the occurrence of defective products, and a reproducible method is devised so that the insert type does not need to be replaced. By eliminating the conventional inefficiency that required a lot of time required for the work and difficult to replace, it is possible to increase the work efficiency by improving the operation rate and productivity.

In addition, the absolute quantity of mold is also reduced, which makes it possible to pursue convenience of management.

Claims (18)

(Correction) a mold gouging step of heating the mold parts of the mold material 10 and 11 worn by the molds and cutting them to a certain degree; a welding landfill step of melting a welding rod to melt the cut parts; Mold material recycling method comprising the mold regeneration step of reproducing the mold by processing the mold (delete) The method of claim 1, wherein the welding rod used in the welding filling step is an EUREKA name 88 # AISI H-19. The method of claim 3, wherein the welding rod used in the welding filling step has a hardness of HRC 55 to 60. The method of claim 1, wherein the welding method of the welding filling step is MIG. The method of claim 1, wherein the welding method of the welding filling step is TIG. The method of claim 1, wherein after the welding step, an annealing step is added. The method of claim 7, wherein the annealing treatment step is 530 ℃ to 550 ℃ 1HR / Inch characterized in that the method. (Correction) The mold material regeneration method according to any one of claims 1 to 3 or 5 to 7, wherein the mold materials 10 and 11 used are SKT4. (Correction) The mold material recycling method according to any one of claims 1 to 3 or 5 to 7, wherein the mold materials 10 and 11 used have a hardness of HRC 45. (Correction) The integrated guide type hot forging die, wherein the die provided on the die set lower die 9 is recyclable and is composed of a pair of counterparts 11 and a lower base 10 in which the die engraving process is an integral type. (Correction) The integrated guide type hot forging die according to claim 11, wherein the lower base 10 of the integrated guide type hot forging die is directly fixed on the die set lower die 9 without a fixing aid. 13. The integrated guide type hot forging die according to claim 11 or 12, wherein the metal mold is made of SKD11. 13. The integrated guide type hot forging die according to claim 11 or 12, wherein the mold is made of SKT4 and HRC 45 of hardness. (Correction) The method according to claim 11 or 12, wherein the method for regenerating the metal mold comprises: a mold gouging step of heating a mold part of the mold material 10 or 11 on which the mold is worn by shaving to a certain extent; A welding-filling step of melting and filling out the welding portion; and a one-piece guide type hot forging using a mold material regenerating method comprising a mold regenerating step of regenerating a mold by processing the buried portion. mold (Correction) The method according to claim 11 or 12, wherein the method for regenerating the metal mold comprises: a mold gouging step of heating a mold part of the mold material 10 or 11 on which the mold is worn by shaving to a certain extent; A welding embedding step of melting and filling out the welding rod; and an unwinding step; and a mold regenerating method including a mold regenerating step of regenerating a mold by processing the buried portion. Guide Type Hot Forging Mold (Correction) The integrated type according to claim 11 or 12, wherein the lower base 10 and the counterpart 11 of the integrated guide system hot forging die are formed with a guide rod 12 and a guide groove 13. Guide Type Hot Forging Mold (Correction) The lower bar 10 and the counterpart 11 of the integrated guide system hot forging die, respectively, the guide rods 12 and the guide grooves 13, respectively, between the molding processes. Integrated guide type hot forging mold, characterized in that formed

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