KR101680477B1

KR101680477B1 - Method for manufacturing spindle and different shape of flange integrally by complex forging

Info

Publication number: KR101680477B1
Application number: KR1020150100310A
Authority: KR
Inventors: 김영진
Original assignee: 주식회사 포메탈
Priority date: 2015-07-15
Filing date: 2015-07-15
Publication date: 2016-11-28

Abstract

The present invention relates to a mold forging process for forming a large flange with respect to a base material; Removing burrs through the trimming process after the mold forging step; And an extrusion forging step of performing a hollow extrusion through an upper center of the formed flange, wherein the die forging step comprises: preparing a base material cut to a predetermined length; A roll working step of forming a spindle portion and a flange portion by forging a part of the base material on a roll position of the mold; And performing forging in a shape different from that of the spindle portion through a forging process with respect to the flange portion in a state in which the base material on which the rolling operation is performed is prepared on the mold portion of the mold, A large-sized flange of a spindle and a deformed shape are integrally formed and manufactured.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of integrally forming a large-sized flange and a spindle by using a composite forging method,

The present invention relates to a method for integrally molding and manufacturing a spindle and a large-sized flange by using a composite forging method. More particularly, the present invention relates to a spindle for manufacturing a product in which a spindle and a large flange are integrated from a single base material through a continuous process such as roll, forging, trimming, or the like without progressing welding work for a plurality of forgings. And a method for manufacturing a monolithic forging product of a flange.

Plastic processing is one of the important production-based industries with a wide range of industrial applications because it can mass-produce basic core parts of the automobile, ship, and aircraft industry as a technical field for molding a desired shape product while minimizing material loss.

Among such plastic working, forging can be classified into hot forging, warm forging and cold forging depending on the manufacturing method and manufacturing equipment. Among them, the hot forging is performed by heating the material at a high temperature of 1000 to 1200 ° C, And it is widely used because it is easy to mold by giving a large deformation by a small force, has a good productivity because it is produced at a high speed, and is easy to mold a complicated product, and cold forging is performed at room temperature It has the advantage that it can increase the precision of the product and make the surface clean product.

Spindles that serve as rotating shafts can be used in general industrial machinery, automobiles, ships, etc., and the life span of the spindle is very short and needs to be frequently replaced. For example, since the gap between the rolls used in the rolling mill is small, the driving motor and the roll can not be connected directly, so that a spindle is provided between the roll and the driving motor to overcome the phase difference. Such a spindle is provided with a spindle adapter for connection with a roll shaft formed on the side of the roll.

In the conventional method of manufacturing the spindle adapter, generally, the two parts of the spindle and the adapter shape are machined separately from each other in a separate line, and then the parts are integrally manufactured by welding.

On the other hand, the finished material is produced through heating, preforming, forging, burr removal, etc. for the cut material. When proceeding for hollow forging products with large adapters or flanges, advanced hollow extrusion When the flange is formed later, the material flows to the flange to form the flange, and the inner wall of the hole through which the hollow extrusion proceeds is dented, and a cracked shape, that is, a crack occurs. That is, there is a problem that the meat is broken due to a shortage of material at the flange.

In addition, the existing spindle-flange integral forgery production method is only applicable to small flanges, and there is a limitation that only a disk-shaped flange can be produced even in a large size, and a complicated and wide- It has not been able to produce it as an integral type due to deformation problems such as unforming such as finishing in forging.

Reference can be made to Patent Document 10-1398941 (May 2014.05.27) as a conventional document that suggests a forging process for the output shaft. The present invention discloses a manufacturing method of a brake booster output shaft for a vehicle which is capable of manufacturing an output shaft having the physical properties required by the booster even when the forging is performed with improved precision by manufacturing the shaft by forging according to the shape of the output shaft. There is no description of a method for manufacturing a large flange having a shape different from that of the spindle in the process of manufacturing the output shaft and a method for preventing the occurrence of the breakage due to the shortage of material when manufacturing the flange through the hollow portion There is a limitation that it is not separately disclosed.

(Patent Document 1) KR10-1398941 B

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a large flange for forming a large flange on a base material to prevent the occurrence of defects that may occur during the molding process of a forged product, Shaped forging process, and then performing an extrusion forging process in which hollow extrusion is performed through the upper center of the formed flange after the mold forging process is performed, thereby manufacturing a complete product shape. .

Further, the present invention relates to a manufacturing method capable of manufacturing a complete product shape by preventing the occurrence of a breakage that may occur during the forging process of a flange by forming a separate burr bite in a forging process for a large flange portion .

According to another aspect of the present invention, there is provided a method of integrally forming and manufacturing a spindle and a large flange having different shapes by using a composite forging process including a forging process and an extrusion forging process.

In the mold forging step, the forging operation is performed in a state where the mold flow blocking end for increasing the flow resistance of the mold is provided outside the mold of the mold having the open structure.

In the die forging step, a burr preventing jig arranged symmetrically in the up-and-down direction to the left-to-right direction of the die part is provided, through which the mother material flows to a place where the breakage is expected during forging.

The method of the present invention for integrally casting a forged product of a flange and a spindle is a method for manufacturing a large sized flange and a spindle in order to prevent the occurrence of defects that may occur during the forming process of a forged product that integrally comprises a large flange After the first forming process, hollow extrusion is performed through the upper center of the formed flange to make a complete product shape.

As a result, when the flange is formed after the hollow extrusion is advanced, the inner wall of the hollow hole is dented and cracks are prevented from occurring as the material for forming the flange flows inside the flange.

Further, in order to prevent the occurrence of the breakage which may occur during the forging process of the flange constituting the spindle flange, a separate bail-resistant tuck may be formed on the flange portion or the bailed end may be formed to manufacture a complete product shape Let's do it.

FIG. 1 is a view showing a rolling process in a forging molding manufacturing process of a flange according to the present invention,
FIG. 2 is a view showing a mold forging process in the process of forging molding of a flange according to the present invention,
FIG. 3 is a view showing a mold forging mold in a state in which the mold flow blocking end is formed,
FIG. 4 is a view showing a smooth flow of a material supplied through a burr protector formed on the outer side of a die forging mold,
5 is a view showing a process of removing burrs on a flange using a trimming mold after a forging process of a flange,
6 is a view showing an extrusion process through a central portion of a spindle flange, and Fig.
7 is a view showing a process of piercing a central portion of a spindle flange to form a through-hole.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of other various forms of implementation, and that these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know completely. Wherein like reference numerals refer to like elements throughout.

It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected," "coupled," or "connected. &Quot;

The present invention relates to a method of manufacturing a spindle and a spindle in which a large-sized flange having a different cross-sectional shape is combined with a spindle, thereby reducing the weight of the raw material, shortening the production time due to the elimination of the welding process, It is characterized in that it can produce high quality spindle products by eliminating defective elements that may occur.

FIG. 1 is a view showing a rolling process in the process of forging a flange according to the present invention, FIG. 2 is a view showing a forging process in a process of forging a flange according to the present invention, and FIG. 3 is a cross- FIG. 4 is a view showing a smooth flow of a material supplied through a burr bite formed on the outer side of a die forging mold, FIG. 5 is a view FIG. 6 is a view showing an extrusion process through a central portion of a spindle flange, and FIG. 7 is a view showing a process of forming a through-hole by piercing a central portion of a spindle flange.

First, as shown in FIGS. 1 and 2, a method of manufacturing a large-sized flange and a spindle by integrally molding a forging product according to the present invention shows a process of manufacturing a large flange from a base material through a mold forging die.

As a whole, the material is subjected to a process of ROLL as a preliminary forming process and a process of forging (hurling) after cutting the material and heating the material after wearing the material.

Type forging die includes a roll seat 10 for performing a process of decomposing the volume of a heated material close to the volume of the product shape and a die 20 in which the spindle and the flange are integrated. Therefore, the flange shape can be forged immediately after the roll operation in the die forging process.

All shapes of the product, except for the length of the spindle part of the required product and the perforated hole, are determined in the die forging process. That is, the flange shape is entirely formed in the die forging process.

In Fig. 1 (a), the base material 100 is made of a material which can be forged, and is cut in advance to a required length according to the manufacturing method of the present invention, and is prepared on the roll seat.

1 (b), the flange 110 and the spindle 120 are formed through a process of forming a certain portion of the base material 100 through a rolling operation.

Meanwhile, a heating process such as a separate heat treatment process may be inserted between the cutting and roll operations to maintain the temperature of the base material at a high temperature during the process, thereby reducing the molding resistance.

The roll work is carried out by lowering the diameter of the base material supplied from the lower mold forming the die forging mold and the roll seat 10 of the upper mold and kneading the material with the mold while rotating the base material to increase the length while reducing the diameter do. The diameter of the base material is such that the diameter of the spindle part of the product is the smallest.

On the other hand, the roll process is a process of decomposing the volume of the heated material close to the shape of the product. As another embodiment, the roll process may be performed by a swing roll device, which is a roll dedicated device, or by a swaging operation in a forging hammer .

2 (a), the base material 100 subjected to the rolling operation is prepared on the die 20 of the die forging die. A portion having a reduced diameter by the rolling operation is placed in a state of being inserted into the mold portion 20, and the base material is inserted and forged so as to have a protruded state on the opposite side. Specifically, the roll-processed portion can be disposed so as to be lowered. Thereafter, as shown in FIG. 2 (b), the upper mold of the die forging is moved up and down repeatedly to bend the material to obtain a desired shape.

On the other hand, in the case of a large flange having a complicated shape, it is preferable to form an open structure because it is expected that thickness of the flange will exceed the thickness dimension and release of the crushing if the dies are closed. However, there is a problem in that the conventional open type structure has a problem in that it is impossible to fill the base material on the wide large flange portion. In order to smooth the flow of the base material to the place where the shape is complicated and the breakage is expected, This creates a foul flow barrier that increases resistance.

As can be seen from FIG. 3, when the bubble flow blocking edge is formed on the portion of the open-type bubble portion that is actually deviated from the precise shape of the large flange, the base material supplied to the inside of the bubble- And after the filling is sufficiently performed inside the part, the surplus is discharged through the sludge flow blocking end.

FIG. 4 shows another embodiment of the present invention, which shows smooth flow of a material supplied through a burr protector formed on a mold of a mold forging die. The burr restricting jaws are arranged symmetrically in the top, bottom, left and right directions of the dies. This facilitates the flow of the mother material to the place where the breakage is expected during forging.

Referring to FIG. 5, burrs are generated when a die forging process of an open structure is performed. Therefore, after the forging process of the flange, the burr is removed through a trimming process.

Referring to FIG. 6, after the trimming process, hollow extrusion molding is performed to increase the overall length of the product while forming an inner diameter hole in the spindle. In the present invention, forward extrusion is performed to ensure the perpendicularity of the flange portion and the spindle portion.

Specifically, the forged product is extruded and forged in a hydraulic press so that the length of the forged product is increased by the number of steps of the product, and at the same time, a hollow shape is formed. The shape of the spindle region is fully formed in this process.

Referring to FIG. 7, a hollow portion is pierced in a hydraulic press or a trimming press to pierce a completely penetrated hole.

In order to prevent the occurrence of defects that may occur during the forming process of a forged product that integrally includes a large flange and a spindle, the present invention as described above may be modified such that after a process of first forming a large flange And a hollow extrusion is performed through the upper center of the formed flange to make a complete product shape.

It is possible to easily and accurately manufacture a large flange having a shape different from that of a spindle through a forging process with a greatly improved precision as well as to easily manufacture a desired shape and shape when manufacturing a spindle having a large flange However, it has a merit that the production efficiency can be increased by reducing the number of processes.

It is to be understood that the terms "comprises", "comprising", or "having" as used in the foregoing description mean that the constituent element can be implanted unless specifically stated to the contrary, But should be construed as further including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims

A method of integrally forming a spindle and a large-sized flange in a mold by using a mold forging die having a roll seat (10) and a mold portion (20) in which a spindle and a flange are integrated,
A die forging step of forming a large flange for the base material;
Removing burrs through the trimming process after the mold forging step; And
And an extrusion forging step of performing a hollow extrusion through an upper center of the formed flange,
In the die forging step,
Preparing a base material cut to a predetermined length;
A roll working step of forming a spindle portion and a flange portion by forging a part of the base material on a roll position of the mold; And
And performing a forging in a shape different from that of the spindle portion through a forging process with respect to the flange portion in a state in which the base material on which the rolling operation is performed is prepared on the mold portion of the mold,
Wherein the step of forging, in a shape different from that of the spindle portion,
A portion where the diameter is reduced by the roll operation is placed in the inserted state of the mold 20 and the base material is inserted and forged so as to have a protruded state on the opposite side,
The large forging of the spindle and the large-sized large-diameter flange are integrally formed by using the composite forging method in which the forging and the forging are sequentially performed,
Way.

The method according to claim 1,
In the die forging step,
A forging operation is performed in a state in which a bubble flow blocking end for increasing bubble flow resistance is provided outside a mold part of the mold having an open structure.
Way.

The method according to claim 1,
In the die forging step,
And a burr prevention protrusion disposed symmetrically with respect to a vertical direction and a left and right direction of the mold part,
Way.