KR101670248B1 - Forging method of rotar shaft - Google Patents

Forging method of rotar shaft Download PDF

Info

Publication number
KR101670248B1
KR101670248B1 KR1020150048098A KR20150048098A KR101670248B1 KR 101670248 B1 KR101670248 B1 KR 101670248B1 KR 1020150048098 A KR1020150048098 A KR 1020150048098A KR 20150048098 A KR20150048098 A KR 20150048098A KR 101670248 B1 KR101670248 B1 KR 101670248B1
Authority
KR
South Korea
Prior art keywords
volume
approximate shape
rotor shaft
calculating
cooling water
Prior art date
Application number
KR1020150048098A
Other languages
Korean (ko)
Other versions
KR20160119883A (en
Inventor
이재윤
Original Assignee
서은특수강(주)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 서은특수강(주) filed Critical 서은특수강(주)
Priority to KR1020150048098A priority Critical patent/KR101670248B1/en
Publication of KR20160119883A publication Critical patent/KR20160119883A/en
Application granted granted Critical
Publication of KR101670248B1 publication Critical patent/KR101670248B1/en

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/06—Making machine elements axles or shafts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
    • B21J1/04—Shaping in the rough solely by forging or pressing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
    • B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations

Abstract

The present invention relates to a method of forging a rotor shaft, comprising: an approximate shape calculating step of calculating an approximate shape obtained by rounding a step of a contour line of a detailed shape cross section of the rotor shaft; and calculating a volume of the approximate shape Preparing a round bar having a volume corresponding to the calculated volume of the approximate shape; and a step of forming an approximate shape and a drilling process for forming a primary workpiece having an approximate shape of the rotor shaft by forging the round bar A drilling process for forming the cooling water supply path and the hydraulic oil supply path in the primary workpiece and a detailed shape forming process for cutting the outer surface of the primary workpiece to form a secondary workpiece having a detailed shape of the rotor shaft And a heat treatment machining step of heat treating the surface of the secondary workpiece, Volume calculation step is to define the distance between a d 2 a phase calculated based on the volume to calculate the standard volume of the calculated approximate shape and size of said cooling water supplied to the above hydraulic fluid supplied d 1, the cooling water supply, A reference value setting step of setting a value of d 2 / d 1 such that cracks or perforations are not generated between the cooling water supply passage and the hydraulic oil supply path with respect to the calculated reference volume as a reference value and d 2 / and a final volume calculating step of calculating a final volume by multiplying the reference volume by the weight, when a value of d 1 is a design value, and setting a ratio of a reference value to a design value as a weight.
According to the present invention as described above, since the approximate shape of the object to be processed is preformed through the mold forging process using the metal mold, the loss of the material that is discarded is not generated unlike the cutting method, , The durability of the object to be processed is greatly improved because the metal structure of the raw material processed by the die forging method using the dies is dense and the durability is improved, and the cutting process is minimized due to the preceding die forging method, The productivity is improved.

Description

[0001] The present invention relates to a method of forging a rotor shaft,

The present invention relates to a method of forging a rotor shaft, and more particularly, it relates to a method of forging a rotor shaft, in which the quality of a raw material is improved through a forging process, thereby improving the workability of the rotor shaft and minimizing the cutting process, And a method for forging a rotor shaft so as to improve a machining speed.

Generally, a rotor shaft includes a shaft extending from a flange and a flange and having a diameter smaller than a diameter of the flange as a rotation axis to which a rotor, which is a rotating part, is coupled in a rotating machine such as a generator, an electric motor, a turbine,

The rotor shaft may be formed with a cooling water supply path through which cooling water is supplied to the inside of the rotor shaft and a hydraulic oil supply path through which hydraulic fluid is supplied.

Conventionally, a rotor shaft is mainly manufactured by using a cutting method. In this cutting method, a raw material having a diameter larger than the flange diameter of the rotor shaft is prepared, and then the outer circumferential surface of the raw material is cut using a cutting tool having a high hardness It is a way to remove it.

However, since the above-mentioned cutting method requires a long processing time, not only the productivity of the product is poor, but also the amount of the raw material that is cut away by the cutting tool is large, resulting in a significant increase in manufacturing cost.

Further, in the case of forming the hole in the longitudinal direction in the deep part forming the hole in the longitudinal direction such as the cooling water supply path and the hydraulic oil supply path through the drilling process, the inner quality of the metal structure around the hole is weakened Cracks or perforations may be generated in the metal structure between the holes in the longitudinal direction such as the cooling water supply passage and the hydraulic oil supply passage, so that holes in the longitudinal direction, such as the cooling water supply passage and the hydraulic oil supply passage, may communicate with each other.

For this reason, there has been a demand for a method of processing a rotor shaft that can improve the quality of raw materials to be processed and minimize the amount of raw materials discarded and improve the processing speed.

Korean Unexamined Patent Publication No. 1997-0003149 " Cutting Method in Cam Shaft Processing &

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for forging a rotor shaft in which an approximate shape of an object to be processed can be formed in advance through a forging process using a mold have.

According to an aspect of the present invention for achieving the above object, there is provided a method of manufacturing a rotor shaft including a flange portion and a shaft portion extending from a flange portion, wherein a rotor is mounted on one end of the shaft portion and a cooling water supply path and a hydraulic oil supply path are formed therein The method comprising: an approximate shape calculating step of calculating an approximate shape obtained by rounding a step of a contour of a detailed shape cross section of the rotor shaft; a volume calculating step of calculating a volume of the calculated approximate shape; Preparing a round bar having a volume corresponding to the volume of the rotor; and a step of forging the round bar to form a primary workpiece having an approximate shape of the rotor shaft, A drilling process for forming the cooling water supply path and the hydraulic fluid supply path to the first workpiece And a heat processing step of heat-treating the surface of the secondary workpiece, wherein the volume calculating step includes the steps of: forming the secondary workpiece having a detailed shape of the rotor shaft by cutting the outer surface thereof; of the reference volume calculating step of calculating a reference volume, and to define the distance between a d 2 the diameter of said cooling water supplied to the d 1, and the hydraulic fluid supplied to the coolant supply, the coolant with respect to the calculated standard volume A reference value setting step of setting a value of d 2 / d 1 such that cracks or punctures do not occur between the supply line and the hydraulic oil supply path as a reference value and d 2 / d 1 in the actual design specification as design values A weight setting step of setting a ratio of a reference value to a design value as a weight, and a final setting step of calculating a final volume by multiplying the reference volume by the weight, There is provided a method of forging a rotor shaft including a step of calculating a yield.

Here, in the material preparation step, a round bar having a diameter larger than the minimum longitudinal cross-sectional diameter of the approximate shape and smaller than the maximum longitudinal cross-sectional diameter or a length smaller than the overall length of the approximate shape is formed so as to be suitable for forming the approximate shape through forging. It is desirable to prepare.

The above-mentioned approximate shape forming step may include a mold preparation step of preparing an upper mold and a lower mold having cavities corresponding to the approximate shape of the rotor shaft, a material heating step of heating the round bar to a predetermined temperature, And a forging molding step of forming a primary workpiece having an approximate shape of the rotor shaft by hitting any one of the upper mold and the lower mold after the molding is mounted on the mold.

delete

In addition, it is preferable that the material of the round bar is S45C which is a medium carbon steel.

According to the present invention, since the approximate shape of the object to be processed is preformed through the mold forging process using the mold, the loss of the material that is discarded is not generated unlike the cutting method, and the manufacturing cost can be greatly reduced .

Further, since the metallic structure of the raw material to be processed is dense due to the forging process using the mold, the durability of the object to be processed is greatly improved.

In addition, due to the preceding die forging process, the cutting process is minimized, and the machining speed is greatly improved, thereby improving the productivity.

1 is a process flow chart of a method for forging a rotor shaft according to an embodiment of the present invention.
2 (a) and 2 (b) are schematic views showing cross sections of an actual shape section and an approximate shape of a rotor shaft according to an embodiment of the present invention.
3 (a), 3 (b) and 3 (c) sequentially illustrate the approximate shape forming steps of a method for forging a rotor shaft according to an embodiment of the present invention.
4 shows a cross section of a primary workpiece after drilling of a rotor shaft according to an embodiment of the present invention.
5 is a cross-sectional view of a secondary work piece of a method for forging a rotor shaft according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings. It is to be noted that like elements in the drawings are represented by the same reference numerals as possible. Further, detailed description of known functions and configurations that may unnecessarily obscure the gist of the invention will be omitted.

FIG. 1 is a process flow chart of a method for forging a rotor shaft according to an embodiment of the present invention. FIGS. 2 (a) and 2 (b) 3 (a), 3 (b) and 3 (c) are views sequentially showing the step of forming the approximate shape of the method for forging the rotor shaft according to the embodiment of the present invention, and Fig. 3 4 is a cross-sectional view of a primary workpiece after drilling of a rotor shaft according to an embodiment of the present invention, and Fig. 5 is a cross-sectional view of a secondary workpiece of a method for forging a rotor shaft according to an embodiment of the present invention Respectively.

1, a method of forging a rotor shaft according to an embodiment of the present invention includes a shape calculating step, a volume calculating step, a material preparing step, an approximate shape forming step, a drilling processing step, a detailed shape forming step, and a heat treatment processing step .

Here, before describing the method for forging the rotor shaft according to the embodiment of the present invention, the rotor shaft 10, which is processed by the working method of the present invention, (11), and a shaft portion (12) extending from the flange portion and on which the rotor is mounted. The longitudinal end face of the rotor shaft (10) is circular.

The rotor shaft 10 is formed at its center with a cooling water supply passage 13 through which cooling water is supplied from the end of the shaft portion 12 toward the flange portion 11, A hydraulic oil supply passage 14 to which hydraulic oil is supplied to communicate with one side of the outer surface of the shaft portion 12 from the end of the flange 11 is formed.

In the shape calculating step, as shown in Fig. 2 (b), the approximate shape of the rotor shaft 10 close to the actual shape cross-section of the rotor shaft, based on the actual shape cross-section of the rotor shaft 10 shown in Fig. To calculate the cross section of the shape (S11)

In the volume calculating step, the volume of the approximate shape is calculated using the approximate shape cross section of the rotor shaft 10, and includes a reference volume calculating step and a final volume calculating step.

The reference volume calculation step divides the approximate shape section of the rotor shaft 10 as shown in FIG. 2 (b) into a predetermined portion, and then calculates the diameter of the maximum vertical section and the diameter of the minimum vertical section of each divided section The average cross sectional area of each divided portion is calculated using one value, the volume of each divided portion is calculated by multiplying the average cross sectional area of each divided portion by the length of each divided portion, The reference volume of the approximate shape of the rotor shaft 10 is calculated by summing the volumes of the respective portions.

At this time, the reference volume of the approximate shape of the rotor shaft can be calculated using a known arithmetic program that calculates the volume from the cross-sectional area.

The final volume calculating step includes a reference value setting step, a weight setting step, and a final volume calculating step.
In the reference value setting step the distance between the diameter of the rotor shaft to the cooling water supply 10, 13 by d 1, 13 and the hydraulic fluid supplied to the cooling water supply 14 as shown in Figure 2 (a) d 2 , a crack or the like is generated between the cooling water supply passage 13 and the hydraulic oil supply passage 14 during drilling processing of the primary workpiece 50 manufactured using the round bar corresponding to the approximate reference volume, The value of d 2 / d 1 , which prevents puncturing, is set as the reference value.
In the weight setting step, when the value of d 2 / d 1 of the primary workpiece 50 to be produced by the actual design specification is a design value, the ratio of the reference value to the design value is set as a weight.
In the final volume calculation step, the final volume is calculated by multiplying the weight value set in the reference volume of the approximate shape calculated above.

As above, by multiplying the weights set in the ratio of a preset d 2 / d 1 value, the reference value for the d 2 / d 1 value of design value of the first processing member 50 is made of the physical design specifications to a reference volume of the calculated approximate shape By calculating the final volume of the approximate shape and molding the primary workpiece 50 to be described later using a round bar having a volume corresponding to the calculated final volume, d 2 / d 1 It is possible to control the density of the primary workpiece 50, which will be described later, according to the variation of the design value.

For example, in the case of forming the cooling water supply passage 13 and the hydraulic oil supply passage 14 through the drilling process described later in the primary workpiece 50 formed by using the approximate reference volume, the cooling water supply passage 13 ) and the d 2 / d 1 value, the reference value to avoid a crack or perforation between the hydraulic fluid supply (14) is not generated, assuming that 4,
If the design value of the d 2 / d 1 value of the primary workpiece 50 to be produced by the actual design specification is 3, the primary workpiece 50 to be produced with the actual design specification is supplied with the cooling water supply passage 13 and the hydraulic oil supply The gap between the coolant supply path 13 and the supply path 14 may be cracked or drilled during the drilling process.

When manufacturing a rotor shaft (10) d 2 / d 1 ratio is that 3, the distance between the coolant supply 13 and the hydraulic fluid supply (14) becomes narrower by the coolant supply 13 and the hydraulic fluid supply ( Cracks or perforations may be generated between the cooling water supply passage 13 and the hydraulic oil supply passage 14 at the time of forming the final volume 14 by setting the final volume to be larger than the reference volume by giving a weight 4/3 to the reference volume, The primary workpiece 50 formed by using the round bar corresponding to the volume is more compact than the primary workpiece formed by using the round bar corresponding to the reference volume and the cooling water supply path 13 and the hydraulic oil supply path It is possible to prevent cracks or perforations from being generated between the upper and lower substrates 14 and 14. (S12)

In the material preparing step, a round bar corresponding to the volume of the approximate shape of the rotor shaft calculated in the volume calculating step is prepared, and a round bar having a diameter or length suitable for forming the approximate shape of the rotor shaft is prepared.

The material of the round bar is preferably low carbon steel such as S45C, which is mainly used as a material of the shaft because it is inexpensive and can be cured at a high frequency. (S13)

In the approximate shape forming step, a round workpiece corresponding to a volume of the approximate shape of the rotor shaft 10 is forged to form a primary workpiece having an approximate shape of the rotor shaft. The mold preparing step, the material heating step, .

3 (a), the upper mold 20 and the lower mold 30 having cavities corresponding to the approximate shape of the rotor shaft are prepared.

In the material heating step, the round bar 40 prepared for forging is heated to a predetermined temperature.

3 (b), a round bar heated to a predetermined temperature is placed between the upper mold 20 and the lower mold 30, and then the molds 20 and 30 are fixed by a hammer The primary workpiece 50 having the approximate shape of the rotor shaft 10 as shown in Fig. 3 (c) is forged by the repeated hitting operation.

Here, the primary workpiece 50 formed through the forging through the metal mold has a more dense metal structure, and the quality of the primary workpiece 50 is greatly improved. (S14)

In the drilling step, as shown in Fig. 4, the cooling water supply path 13 and the hydraulic oil supply path 14 are formed in the primary workpiece 50 processed through the approximate shape forming step through drilling.

In this case, when the cooling water supply passage 13 and the hydraulic oil supply passage 14 are formed close to each other in the primary workpiece 50, the metalwork between the cooling water supply passage 13 and the hydraulic oil supply passage 14 Cracks or perforations may be generated to cause the coolant supply passage 13 and the hydraulic oil supply passage 14 to communicate with each other. The present invention is applicable to the inner metal structure of the primary workpiece 50, So that cracks or perforations are not generated in the metal structure between the cooling water supply passage 13 and the hydraulic oil supply passage 14. (S15)

In the detailed shape forming step, the secondary workpiece 60 having the same shape as the rotor shaft as shown in Fig. 5 is formed by machining a detailed shape on the outer surface of the primary workpiece through cutting processing (S16)

In the heat treatment step, the surface of the secondary workpiece 60 is hardened by surface high frequency heat treatment to obtain the finished product of the rotor shaft 10. (S17)

As described above, in the method of forging a rotor shaft according to an embodiment of the present invention, the volume of the approximate shape close to the actual shape of the rotor shaft 10 is calculated, and the round bar corresponding to the volume of the approximate shape is die- The method of forming the approximate shape of the rotor shaft in advance makes it possible to greatly reduce the manufacturing cost by avoiding the loss of material that is discarded unlike the cutting processing method, And productivity is improved.

Also, since the metallic structure of the raw material to be processed is dense due to the forging process using the mold, the durability of the produced rotor shaft is greatly improved.

Although the present invention has been described in connection with the preferred embodiments, it is possible to make various modifications and variations without departing from the spirit and scope of the invention. It is, therefore, to be understood that the appended claims will include all such modifications and changes as fall within the true spirit of the invention.

10: rotor shaft 11: flange portion
12: shaft portion 13: cooling water supply path
14: Hydraulic oil supply path 20: Upper mold
30: Lower mold 40: Round bar
50: primary workpiece 60: secondary workpiece

Claims (6)

1. A method of machining a rotor shaft including a flange portion and a shaft portion extending from a flange portion, wherein a rotor is mounted on one end of the shaft portion, and a cooling water supply path and a hydraulic oil supply path are formed therein,
An approximate shape calculating step of calculating an approximate shape obtained by rounding a stepped portion of a contour of a detailed shape cross section of the rotor shaft;
A volume calculating step of calculating the calculated volume of the approximate shape;
Preparing a round bar having a volume corresponding to the calculated volume of the approximate shape;
An approximate shape forming step of forging the round bar to form a primary workpiece having an approximate shape of the rotor shaft;
A drilling process step of forming the cooling water supply passage and the hydraulic oil supply passage inside the primary work through drilling;
A detailed shape forming step of cutting the outer surface of the primary workpiece to form a secondary workpiece having a detailed shape of the rotor shaft;
And a heat treatment processing step of heat-treating the surface of the secondary workpiece,
The volume calculating step
A reference volume calculating step of calculating the reference volume of the calculated approximate shape;
A diameter of the cooling water supply passage is d 1 and a distance between the cooling water supply passage and the hydraulic oil supply passage is defined as d 2 , a crack or a crack is formed between the cooling water supply passage and the hydraulic oil supply passage with respect to the calculated reference volume. A reference value setting step of setting a value of d 2 / d 1 as a reference value so that puncturing does not occur;
A weight setting step of setting a ratio of a reference value to a design value as a weight when a value of d 2 / d 1 in an actual design specification is a design value;
And a final volume calculating step of calculating a final volume by multiplying the reference volume by the weight. The method according to claim 1,
In the material preparation step
Wherein the diameter of the round bar is larger than the minimum cross-sectional diameter of the approximate shape and smaller than the maximum cross-sectional diameter or shorter than the entire length of the approximate shape so as to be suitable for forming the approximate shape through forging. Forging of shaft. The method according to claim 1,
The approximate shape forming step
A mold preparing step of preparing an upper mold and a lower mold having cavities corresponding to the approximate shape of the rotor shaft;
A heating step of heating the round bar to a predetermined temperature;
And a forging molding step of forming a primary workpiece having an approximate shape of the rotor shaft by striking one of the upper mold and the lower mold after mounting the heated round bar on the mold, Forging process. delete The method according to claim 1,
Wherein the material of the round bar is S45C which is a medium carbon steel. delete
KR1020150048098A 2015-04-06 2015-04-06 Forging method of rotar shaft KR101670248B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150048098A KR101670248B1 (en) 2015-04-06 2015-04-06 Forging method of rotar shaft

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150048098A KR101670248B1 (en) 2015-04-06 2015-04-06 Forging method of rotar shaft

Publications (2)

Publication Number Publication Date
KR20160119883A KR20160119883A (en) 2016-10-17
KR101670248B1 true KR101670248B1 (en) 2016-10-31

Family

ID=57250353

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020150048098A KR101670248B1 (en) 2015-04-06 2015-04-06 Forging method of rotar shaft

Country Status (1)

Country Link
KR (1) KR101670248B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102282128B1 (en) 2021-01-14 2021-07-28 (주)에이치엠테크놀로지 Device for manufacturing stator shaft
KR20210131651A (en) * 2020-04-24 2021-11-03 주식회사 금호엔티시 fixing and processing method of cam shaft

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102012841B1 (en) 2017-08-11 2019-08-21 양희준 Preflex girder and manufacturing method thereof

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US97000A (en) 1869-11-16 Improvement in machine for grinding the

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210131651A (en) * 2020-04-24 2021-11-03 주식회사 금호엔티시 fixing and processing method of cam shaft
KR102462151B1 (en) * 2020-04-24 2022-11-02 주식회사 금호엔티시 fixing and processing method of cam shaft
KR102282128B1 (en) 2021-01-14 2021-07-28 (주)에이치엠테크놀로지 Device for manufacturing stator shaft

Also Published As

Publication number Publication date
KR20160119883A (en) 2016-10-17

Similar Documents

Publication Publication Date Title
CN108290256B (en) Fluid tip and method of making same
KR101670248B1 (en) Forging method of rotar shaft
CN103212959A (en) Method for forming toothed block
US11318569B2 (en) Net forged spiral bevel gear
MX2013008546A (en) A method for the manufacture of a mould part with channel for temperature regulation and a mould part made by the method.
US9616486B2 (en) Process for making forged and machined components
CN105729067A (en) Machining technology for engine drive sleeves
CN105443137A (en) Integral type cutter ring for disc cutter and manufacturing method thereof
CN105014316A (en) Processing method for bucket teeth
CN205324588U (en) Mould is forged to subdivision formula of bucket tooth
CN106393398A (en) Long-service-life alloy steel die and machining method thereof
CN105458136B (en) The dissection type forging method and its mould of a kind of bucket tooth
KR101954757B1 (en) A Manufacturing Method Of Gear And The Gear Manufactured Thereby
JP2001205385A (en) Die for cold-forging bevel gear with web
US10239113B2 (en) Net shaped forging for fluid ends and other work pieces
RU2354488C2 (en) Method of rifled bore fabrication
CN107900611A (en) A kind of hammer stem covers multiple step format cold-extrusion technology method
KR101057983B1 (en) Belt Pulley Manufacturing Method
US11065673B2 (en) Hot steel forging in horizontal press
CN112264568B (en) Forging method of casing jig of air bag of drilling pump for petroleum drilling machine circulation system
KR100810101B1 (en) Forging mold for minimizing burr
CN105234641A (en) High manganese steel balance block manufacturing method
CN107627076A (en) A kind of cycloid hydraulic motor unitary stator processing technology
KR20090078863A (en) The forging-processing method for crane wheel
KR101444871B1 (en) Hot forging method for manufacturing a hollow core member

Legal Events

Date Code Title Description
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20191010

Year of fee payment: 4