KR101851187B1 - Radial forging method for a shaft with 4 pole bodies and shaft manufactured by the same - Google Patents

Abstract

A radial forging method for a shaft with 4-pole bodies according to the present invention comprises: a preliminary machining step of machining a raw material of a shaft in the form of a round bar by forging and rotating the raw material into a multi-stage shaft body having a different diameter in the longitudinal direction; and a radial forging step for radially forging the shaft body without rotating the shaft body and forming 4-pole bodies on a first body part having the largest diameter in the shaft body. According to the present invention, by applying radial forging unlike the prior art, optimized machining for 4-pole bodies can be performed.

Description

TECHNICAL FIELD [0001] The present invention relates to a radial forging method for a shaft product having a four-pole body and a shaft product manufactured thereby,

The present invention relates to a shaft product radial forging method having a quadrupole body and a shaft product manufactured by the method. More particularly, the present invention relates to a shaft product manufactured by a four-pole body (Pole bodies ) And a shaft product manufactured by the method. [0002] In the present invention,

Shafts In particular, the Salient 4 pole rotor shaft is a core part of the generator as a center shaft that generates electricity through rotational motion in the generator.

The 4-pole integral rotor shaft is integrally formed with a rotor shaft body and four protruding 4 pole bodies to cope with vibration and overspeed.

Since such a four-pole integrated rotor shaft is applied to a generator, it must be exposed under high temperature and high pressure, and fatigue cracks due to twisting may occur in high-speed rotation.

In addition, due to the characteristics of the product, the change in the outer diameter step of the 4-pole integral rotor shaft occurs to a large extent. Therefore, the 4-pole integral rotor shaft requires strength to withstand a critical rotation speed of 120% or more of the rated speed for the purpose of function satisfaction.

On the other hand, the work for the four-pole integral rotor shaft, that is, the forging work, is usually a round-bar type multi-stage plastic working.

However, there is a problem in that when the 4-pole integral rotor shaft is machined by the multi-stage plastic working of the round bar, the input raw material is increased due to the limit of processing, and the product price is increased.

Particularly, in the prior art, since the protruding quadrupole shape after the forging has been manufactured by cutting only the basic shape, it has been disadvantageous in terms of price competitiveness due to waste of material and additional labor cost. In addition, There is a problem in that the metal flow is cut off and the strength of the product is lowered.

Therefore, it is necessary to secure the competitiveness of the rotor shaft manufacturing cost. In order to solve this problem, the new concept forging technology that shapes the 4 pole bodies into the shape close to the final shape is used to reduce the input raw materials, It is necessary to secure cost competitiveness.
For reference, this application is the result of research conducted by the Ministry of Commerce, Industry and Energy and the Korea Institute of Industrial Technology Development (R & D, R0005623).

Korea Patent Office Application No. 10-1995-0031268

It is an object of the present invention to provide a shaft product radial forging method and a method therefor which can be optimized for four pole bodies by applying radial forging, And to provide a manufactured shaft product.

In order to accomplish the above object, the present invention provides a method of forging a shaft product having a quadrupole body, comprising the steps of: rotating a raw material of a rounded shaft product while forging to form a shaft body having a multi- a shaft body; And a radial forging process in which the shaft body is radially forgotten without rotating the shaft body to form 4 pole bodies in the first body portion having the largest diameter in the shaft body, do.

Wherein the shaft body includes a pair of second body portions formed at both ends of the first body portion so as to be stepped smaller than a diameter of the first body portion; And a pair of third body portions formed at both ends of the pair of second body portions so as to be stepped smaller than the diameter of the second body portion, wherein during the radial forging step, the first body portion is struck The lengths of the second and third body parts do not change and only the length of the first body part can be increased.

Wherein the preliminary processing step includes loading the raw material and clamping one end of the raw material to a first manipulator; Machining half of the first body portion and the second and third body portions through interaction with a general forging die while the first manipulator rotates or moves the raw material; Moving a workpiece to a second manipulator disposed opposite the first manipulator and clamping the workpiece to the second manipulator; And machining the other half of the second and third body portions through interaction with the general forging die while the second manipulator rotates or moves the workpiece.

The radial forging may be performed by a third and a fourth manipulator clamping both ends of the shaft body to rotate the shaft body in one direction to pass the four radial forging dies, Direction radial forging step.

The radial forging may be performed by a third and a fourth manipulator clamping both ends of the shaft body to rotate the shaft body in the reverse direction to pass the radial forging die through the four radial forging dies And may further include a reverse radial forging step.

The method may further include a heat treatment step of heat treating the product after the radial forging step.

According to the present invention, by applying radial forging unlike the prior art, it is possible to optimize the processing for 4 pole bodies. Further, according to the present invention, it is possible to secure price competitiveness by reducing the input raw material, increasing the material recovery rate and reducing the cutting processing cost, and further, it is possible to provide a quality that is much higher than the conventional one in terms of strength. Further, according to the present invention, the metal flow can be connected without being disconnected, thereby improving the strength of the product and improving the service life.

FIG. 1 is a view illustrating a process in which raw material of a round bar is processed into a rotor shaft by a shaft product radial forging method having a quadrupole body according to an embodiment of the present invention.
2 is a front view of the rotor shaft;
3 is a sectional view taken along the line AA in Fig.
4 is a layout diagram of a radial forging die.
5 is a flowchart of a shaft product radial forging method having a quadrupole body according to an embodiment of the present invention.
6A to 6I are step-by-step process diagrams of the pre-processing step.
7A to 7G are step-by-step process diagrams of the radial forging process.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described in more detail with reference to the accompanying drawings.

FIG. 2 is a front view of a rotor shaft; FIG. 3 is a front view of the rotor shaft; FIG. 3 is a front view of the rotor shaft; Fig. 5 is a flow chart of a shaft product radial forging method having a quadrupole body according to an embodiment of the present invention, Figs. 6A to 6I are sectional views of a preforming 7A to 7G are step-by-step process diagrams of the radial forging process.

Referring to these drawings, a shaft product radial forging method having a quadrupole body according to the present embodiment may include a preliminary machining step (S10), a radial forging step (S20), and a heat treatment machining step (S30).

For reference, a festival product manufactured by a shaft product radial forging method having a quadrupole body according to the present embodiment is a shaft 130, which is a four-pole integral rotor shaft Salient 4 pole rotor shaft, 130).

However, the scope of the present invention is not limited to these matters. That is, since a general large shaft other than a rotor shaft is also a shaft product, the scope of the present invention can be applied to such a shaft. In the following description, the shaft product is referred to as a salient 4-pole rotor shaft (130).

First, the preliminary machining step S10 is to rotate the round rod raw material 110 as shown in FIG. 1 (a) to FIG. 1 (b) And then machined into a multi-stage rotary shaft body 120 having different diameters along the length direction.

That is, while the raw material 110 of the round bar shown in FIG. 1 (a) is forged through the steps of FIGS. 6 (a) to 6 (i), the shaft body of the multi-stage structure having different diameters along the longitudinal direction shown in FIG. (120).

The shaft body 120 includes a first body portion 121 having a largest diameter and a center portion and a second body portion 121 having a diameter smaller than the diameter of the first body portion 121 at both ends of the first body portion 121 A pair of third body portions 123 formed at both ends of the pair of second body portions 122 so as to be stepped smaller than the diameter of the second body portion 122, . In the case of this embodiment, a three-stage structure is applied, but a two-stage or four-stage structure is also fully applicable.

In the preliminary machining step (S10), a conventional general forging die (140) and first and second manipulators (161, 162) can be used.

6A to 6I, the preliminary machining step S10 will be described in more detail.

First, as shown in FIG. 6A, the raw material 110 is loaded and one end thereof is clamped to the first manipulator 161. 6B to 6C, the first manipulator 161 rotates or moves the raw material 110 and interacts with the general forging die 140 to move the first and second body portions 121, (Not shown).

When the forging process is completed for the half of the raw material 110, the first manipulator 161 is retracted to the original position and the second manipulator 162 on the opposite side approaches the general forging die 140 as shown in FIG. 6D.

6E to 6G, the workpiece is transferred to the second manipulator 162 disposed on the opposite side of the first manipulator 161 and clamped to the second manipulator 162.

Then, as shown in FIG. 6H, the second manipulator 162 rotates or moves the workpiece, and interacts with the general forging die 140 to machine the other half of the second and third body parts 123.

Thereby, a shaft body 120 having a multi-stage structure having different diameters along the longitudinal direction is made as shown in Figs. 6I and 1B.

Meanwhile, the radial forging step S20 is a step of forming four pole bodies 131 on the first body part 121 of the shaft body 120 as shown in FIGS. 1 (b) to (c) . At this time, unlike the preliminary machining step S10 described above, the shaft body 120 is radially forged without being rotated.

Unlike the conventional method described above, the radial forging is uniquely the same as in the present embodiment in order to form the four integral four-pole bodies 131 into an optimized shape.

For reference, the radial forging is a plastic working method in which the shaft body 120 is struck radially inward through four radial forging dies 150 installed at intervals of 90 degrees as shown in FIG. Such radial forging provides advantages of high productivity, high quality maintenance, and ease of numerical control by programming. Therefore, it is possible to secure price competitiveness by increasing the material recovery rate and cutting cutting cost, and to provide better quality in terms of strength.

On the other hand, in the above-described general rotor shaft machining, a phenomenon that the metal flow is disconnected generally occurs. However, when the radial forging step S20 is performed as in the present embodiment, the metal flow is connected The strength of the product can be improved as well as the lifetime can be improved.

Meanwhile, in the radial forging step S20, four radial forging dies 150 and third and fourth manipulators 163 and 164 may be used instead of the conventional general forging dies 140. [

In the radial forging step S20, the four-pole body 131 is formed on the first body portion 121 of the shaft body 120. In this case, the radial forging process is performed only by blowing the three radial forging dies 150 without rotation The lengths of the second and third body parts 123 do not change and only the length of the first body part 121 can be increased.

This radial forging step S20 may include a one-direction radial forging step S21 and a reverse radial forging step S22.

In the one-direction radial forging step S21, the third manipulator 163 and the fourth manipulator 163 clamping both ends of the shaft body 120 rotate the shaft body 120 in one direction to produce four So that the radial forging process is performed while passing through the radial forging die 150.

In the reverse radial forging step S22, the third manipulator 163 and the fourth manipulator 163, which clamp both ends of the shaft body 120, rotate the shaft body 120 in the reverse direction Radial forging die 150 while passing through the radial forging die 150.

In the case of this embodiment, after the reverse radial forging step S22 is performed, the one-direction radial forging step S21 is performed again so that the rotor shaft 130 can be made.

The radial forging step S20 will be described in more detail with reference to FIGS. 7A through 7G.

First, as shown in FIG. 7A, the shaft body 120 made in the preliminary machining step S10 is loaded, and one end of the shaft body 120 is clamped to the third manipulator 163. 7B and 7C, the third manipulator 163 is moved to the fourth manipulator 163 side so that the other end of the shaft body 120 is clamped to the fourth manipulator 163. Whereby both ends of the shaft body 120 are clamped to the third manipulator 163 and the fourth manipulator 163.

Next, as shown in FIG. 7D, the third manipulator 163 and the fourth manipulator 163 rotate the shaft body 120 in one direction to rotate the four radial forging dies 150, and perform radial forging.

Next, as shown in FIG. 7E, the third manipulator 163 and the fourth manipulator 163 rotate the shaft body 120 in the opposite direction in the reverse direction, and the radial forging process proceeds while passing through the four radial forging dies 150.

Then, as shown in FIG. 7F, the third manipulator 163 and the fourth manipulator 163 rotate the shaft body 120 in one direction to rotate the four radial forging dies 150, and perform radial forging .

The rotor shaft 130 having the four-pole body 131 formed on the first body portion 121 of the shaft body 120 can be made as shown in FIGS. 7G and 1C.

Finally, the heat treatment step S30 is a step of heat treating the product after the radial forging step S20. That is, a process of heat-treating the rotor shaft 130 manufactured as shown in FIG. 1 (c). It can be finished product by heat treatment. Of course, the heat treatment step (S30) is not necessarily applied, and may be omitted if necessary.

With this configuration, the raw material 110 of the round rod is rotated while forging as shown in FIGS. 1 (a) and 1 (b) through the preliminary processing step S10 to form a shaft body 120 having a multi- A four-pole body 131 is formed on the first body portion 121 of the shaft body 120 as shown in (b) to (c) of FIG. 1 through a radial forging step S20 , And the rotor shaft 130, which is the final product, can be manufactured by heat treatment.

According to the present invention as described above, radial forging can be applied to optimize 4 pole bodies.

Further, according to the present invention, it is possible to secure price competitiveness by reducing the input raw material, increasing the material recovery rate and reducing the cutting processing cost, and further, it is possible to provide a quality that is much higher than the conventional one in terms of strength. When the present invention is actually applied, there is an effect that the input raw material can be reduced by 24% or more.

Further, according to the present invention, the metal flow can be connected without being disconnected, thereby improving the strength of the product and improving the service life.

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. It is therefore intended that such modifications or alterations be within the scope of the claims appended hereto.

110: Raw material 120: Shaft body
121: first body part 122: second body part
123: third body part 130: rotor shaft
131: pole body 140: general forging mold
150: Radial forging die 161 to 164: Manipulator

Claims (7)

And a pair of second body parts formed to be stepwise smaller than the first body part at both ends of the first body part along the length direction by forging while rotating the raw material of the shaft product, And a pair of third body portions formed at both ends of the pair of second body portions so as to be stepped smaller than the diameter of the second body portion, into a rotor shaft body; And
Characterized in that it includes a radial forging process in which the shaft body is not rotated but forms a 4-pole body in the first body portion having the largest diameter in the shaft body A method of radial forging of a shaft product having a four - pole body.
The method according to claim 1,
Wherein the first body part is struck at the radial forging step so that the length of the second body part and the third body part do not change and only the length of the first body part is increased. Way.
3. The method of claim 2,
The pre-
The raw material is loaded and one end thereof is clamped to a first manipulator;
Machining half of the first body portion and the second and third body portions through interaction with a general forging die while the first manipulator rotates or moves the raw material;
Moving a workpiece to a second manipulator disposed opposite the first manipulator and clamping the workpiece to the second manipulator; And
And machining the other half of the second and third body portions through interaction with the general forging die while the second manipulator rotates or moves the workpiece. Product radial forging method.
The method according to claim 1,
Wherein the radial forging comprises:
And a radial forging step of performing radial forging by passing the four radial forging dies while the third and fourth manipulators clamping both ends of the shaft body rotate the shaft body in one direction Wherein the radial forging of the shaft product has a quadrupole body.
5. The method of claim 4,
Wherein the radial forging comprises:
And the third and fourth manipulators clamping both ends of the shaft body rotate the shaft body in the opposite direction to rotate the radial forging process while passing the four radial forging dies, Further comprising the steps of: (a) forming a four-pole body;
The method according to claim 1,
Further comprising a heat treatment step of heat treating the product after the radial forging step is performed.
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