KR20140060758A - Assembly type balancing mandrel - Google Patents

Assembly type balancing mandrel Download PDF

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Publication number
KR20140060758A
KR20140060758A KR1020120127464A KR20120127464A KR20140060758A KR 20140060758 A KR20140060758 A KR 20140060758A KR 1020120127464 A KR1020120127464 A KR 1020120127464A KR 20120127464 A KR20120127464 A KR 20120127464A KR 20140060758 A KR20140060758 A KR 20140060758A
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KR
South Korea
Prior art keywords
balancing
hole
outer diameter
screw
mandrel
Prior art date
Application number
KR1020120127464A
Other languages
Korean (ko)
Inventor
김충기
김종기
김정욱
이동엽
Original Assignee
에스티엑스중공업 주식회사
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.)
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Publication date
Application filed by 에스티엑스중공업 주식회사 filed Critical 에스티엑스중공업 주식회사
Priority to KR1020120127464A priority Critical patent/KR20140060758A/en
Publication of KR20140060758A publication Critical patent/KR20140060758A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/40—Expansion mandrels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/06—Fibrous reinforcements only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/06—Engines with means for equalising torque
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C3/00—Shafts; Axles; Cranks; Eccentrics
    • F16C3/04—Crankshafts, eccentric-shafts; Cranks, eccentrics
    • F16C3/20—Shape of crankshafts or eccentric-shafts having regard to balancing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/22—Compensation of inertia forces
    • F16F15/26—Compensation of inertia forces of crankshaft systems using solid masses, other than the ordinary pistons, moving with the system, i.e. masses connected through a kinematic mechanism or gear system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2230/00—Purpose; Design features
    • F16F2230/0011—Balancing, e.g. counterbalancing to produce static balance
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2230/00—Purpose; Design features
    • F16F2230/32—Modular design

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Composite Materials (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

The present invention relates to a prefabricated balancing mandrel. More particularly, the present invention relates to a prefabricated balancing mandrel that can prevent oil leakage, increase lifetime and facilitate manufacture by enabling the balancing mandrel to be assembled rapidly and easily by a first member and a second member instead of applying an oil pressure method to the balancing mandrel, has a precision processing part for precision assembly formed on the first member, has, on the second member, a precision processing combination hole for being combined with the precision processing part, has a taper part and a straight line part formed on the first member and the second member, thereby improving the combination precision of the balancing mandrel to an object for balancing, and facilitating the disassembly of the balancing mandrel from the object for balancing using a jig for disassembly that is composed of a housing and a screw for disassembly. For the purpose, the first member comprises: a screw part including a screw on an outer circumference surface thereof; a precision processing part for precision processing connected to the screw part and having an outer diameter greater than that of the screw part; a first taper part formed with a diameter greater than that of the precision processing part and including a taper having an outer diameter increasing from the screw part; and a connection part arranged between the precision processing part and the first taper part and having an outer diameter greater than that of the precision processing part and less than that of the first taper part. The first member is combined with the penetrating hole of the object for balancing that is a rotor including the penetrating hole in the middle.

Description

Assembly type balancing mandrel

The present invention relates to a prefabricated balancing mandrel. More specifically, the balancing mandrel can be quickly and easily assembled by screwing the first member and the second member to the balancing mandrel instead of applying a hydraulic method, thereby improving oil life and life span A precision machining portion for precision assembly is formed on the first member, a second member is formed with a precision machining hole for mutual engagement with the precision machining portion, and a tapered portion is formed on the first and second members, By forming the straight portion, it is possible not only to improve the coupling accuracy of the balancing mandrel with respect to the balancing object, but also to make it possible to quickly and easily disassemble the balancing mandrel from the balancing object using the resolving jig composed of the housing and the screw for disassembly The present invention relates to a prefabricated balancing mandrel.

When the rotating body such as the turbine wheel or the compressor wheel is slightly unbalanced with respect to the rotating shaft, a disturbing force is generated which is periodically changed in direction by the centrifugal force of the unbalanced portion during rotation. Periodic vibrations generated by this disturbance force cause repetitive loads to be imposed on the rotating body, the parts associated therewith, and each part of the machine supporting the rotating body.

As a result, the actual load applied to each part of the machine becomes larger than the load at the time of designing, which causes vibration and noise to be further exacerbated, leading to breakdown of main parts and failure. In severe cases, it will cause major damage to the machinery and shorten the life of machinery and equipment.

In most machines, a certain weight of material is added to or removed from the rotating body in order to maintain balance by correcting the unbalance of the rotating body against the rotating shaft. This operation is called balancing.

Meanwhile, in order to rotate the rotating body (hereinafter referred to as a 'balancing object'), a rotating shaft is formed by using a shaft-shaped jig, which is called a balancing mandrel.

15 is a structural view of a general balancing mandrel.

Referring to FIG. 15, in the case of a balancing object 1 having a through hole at its central portion, the balancing mandrel 2 is constituted by a single shaft coupled to the balancing object 1. At both ends of the balancing mandrel 2, bearings (not shown) for supporting the rotation are provided at three positions.

A general balancing mandrel 2 is filled with oil so that the balancing mandrel 2 is fastened to the balancing object 1 and then mud bolts (not shown in FIG. 15, located at the left end) It is possible to increase the hydraulic pressure inside the balancing mandrel 2 and fix the balancing object 1 and the balancing mandrel 2 by the volume expansion of the balancing mandrel 2 using the oil pressure so that the balance degree can be maintained Hydraulic system is used.

However, in such a hydraulic system, there is a problem that oil is filled in the balancing mandrel, so that there is a high possibility that leakage occurs, thereby shortening the life span and manufacturing cost.

Therefore, in order to fix the balancing mandrel to the balancing object, the use of a simple fastening structure instead of the hydraulic method is required to improve the life span of the balancing mandrel and to improve the coupling accuracy of the balancing mandrel to the balancing object .

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a balancing device for a balancing mandrel, It is an object of the present invention to provide a prefabricated balancing mandrel capable of quickly and easily disassembling a balancing mandrel from a balancing object.

To achieve the above object, a prefabricated balancing mandrel according to the present invention includes: a threaded portion having an outer circumferential surface; A precision machining portion connected to the threaded portion and having an outer diameter larger than that of the threaded portion, for precision assembly; A first tapered portion having an outer diameter larger than that of the precision machined portion and having a taper having a gradually increasing outer diameter as the distance from the threaded portion increases; And a connecting portion provided between the precision machining portion and the first tapered portion and having an outer diameter larger than that of the precision machined portion and having an outer diameter smaller than that of the first tapered portion, And a first member coupled to the through hole of the balancing object.

The first member may further include a first support portion supported by the bearing for rotation and having an outer diameter larger than that of the first taper portion, and a first support portion for precise assembly between the first taper portion and the first support portion, A straight line portion may be provided.

In addition, the prefabricated balancing mandrel may include a screw coupling hole to be screwed with the screw portion; And a precision machining hole having an inner diameter larger than that of the threaded hole and adjacent to the threaded hole, the precision machined hole being precisely assembled with the precision machined portion, And a second member coupled to the through hole.

The second member may further include a second tapered portion that gradually increases in outer diameter from the precision machining hole toward the threaded hole and includes a portion of the precision machining hole and a portion of the screwed hole. .

The second member may further include a second support portion supported by the bearing and having a larger outer diameter than the second taper portion, and a second support portion for supporting the second member for precision assembly between the second taper portion and the second support portion. A straight line portion may be provided.

According to the present invention, the balancing mandrel can be quickly and easily assembled by screwing the first member and the second member to the balancing mandrel instead of applying the hydraulic method, thereby making it possible to increase the life without oil leakage There is an effect of facilitating fabrication.

According to the present invention, a precision machining portion for precise assembly is formed in a first member, a second member is formed with a precision machining hole that is mutually coupled with a precision machined portion, and a tapered portion is formed in the first and second members By forming the rectilinear section, the coupling accuracy of the balancing mandrel with respect to the balancing object can be improved.

According to the present invention, the balancing mandrel can be quickly and easily disassembled from the balancing object by using the disassembling jig composed of the housing and the disassembling screw.

FIG. 1 and FIG. 2 are perspective views illustrating a combined state of a prefabricated balancing mandrel and a balancing object according to a preferred embodiment of the present invention,
FIG. 3 is a sectional view of the assembled balancing mandrel according to the preferred embodiment of the present invention,
4 and 5 are perspective views showing a state where a first member and a second member of a prefabricated balancing mandrel according to a preferred embodiment of the present invention are engaged,
Figs. 6 and 7 are perspective views of the first member in Fig. 4,
Fig. 8 is a front view of Fig. 6,
Figs. 9 and 10 are perspective views of the second member in Fig. 4,
11 is a front view of Fig. 9,
Fig. 12 is a sectional view of Fig. 11,
13 is a cross-sectional view of a disassembling jig for disassembling a prefabricated balancing mandrel according to a preferred embodiment of the present invention from a balancing object,
14 is a sectional view showing a state in which a balancing object, a prefabricated balancing mandrel, and a disassembling jig are engaged,
15 is a structural view of a general balancing mandrel.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components throughout the 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 addition, the preferred embodiments of the present invention will be described below, but it is needless to say that the technical idea of the present invention is not limited thereto and can be variously modified by those skilled in the art.

1 and 2 are perspective views illustrating a combined balancing mandrel and a balancing object according to a preferred embodiment of the present invention. 3 is a cross-sectional view illustrating a combined balancing mandrel and a balancing object according to a preferred embodiment of the present invention. 4 and 5 are perspective views illustrating a state where a first member and a second member of the assembled balancing mandrel according to a preferred embodiment of the present invention are engaged. Figs. 6 and 7 are perspective views of the first member of Fig. 4, and Fig. 8 is a front view of Fig. Figs. 9 and 10 are perspective views of the second member in Fig. 4, Fig. 11 is a front view of Fig. 9, and Fig. 12 is a sectional view of Fig.

1 to 12, a prefabricated balancing mandrel according to a preferred embodiment of the present invention includes a first member 10 coupled to a through hole of a balancing object A, which is a rotator having a through hole at a center portion thereof, And a second member (100).

The balancing object A is a rotating body, and is an object to which rotational balancing should be controlled by the assembled balancing mandrel according to the present invention. For example, in a micro gas turbine, a balancing object A may be a turbine wheel, a compressor wheel, or the like. A substantially central portion of the balancing object A, which is a rotating body, is provided with a through hole through which a rotating shaft (corresponding to the rotating shaft in the present invention) is coupled.

The first member 10 is inserted into the through hole of the balancing object A and is formed into a rod shape as a whole. 8, the first member 10 includes a threaded portion 12, a precision machined portion 14, a connecting portion 16, a first tapered portion 18, a first straightened portion 20, And includes a first support portion (22).

The threaded portion 12 is provided at one end of the first member 10, and is provided with a screw on its outer circumferential surface. The threaded portion 12 is screwed into the threaded hole 112 of the second member 100.

The precision machined portion 14 is connected to the threaded portion 12 and has an outer diameter larger than that of the threaded portion 12. The precision machining portion 14 is coupled to the precision machining hole 114 of the second member 100 and the first member 10 and the second member 100 are precisely aligned with each other, And the second member 100 are precisely assembled together so that the rotation axis formed by the engagement of the first member 100 and the second member 100 can be accurately leveled.

For this purpose, it is preferable that the precision machining portion 14 of the first member 10 and the precision machining hole 114 of the second member 100 are mutually engaged by an intermediate fit. In this case, if the coupling between the precision machining portion 14 and the precision machining hole 114 is constrained, hot machining must be performed to join the first and second members 10 and 100 together. The present invention is intended to quickly and easily join the first member (10) and the second member (100) by simple assembly by cold working without heating, and therefore, And the precision machining portion 14 and the precision machining hole 114 are combined.

The connection portion 16 is connected to the precision machining portion 14 and is formed to have an outer diameter larger than that of the precision machining portion 14. [ At this time, the connection portion 16 has an outer diameter larger than that of the precision machined portion 14 and has a smaller outer diameter than the first taper portion 18. The connecting portion 16 is provided between the precision machining portion 14 and the first taper portion 18 and serves to connect the first and second taper portions 18 to each other.

The first tapered portion 18 is connected to the connecting portion 16 and has an outer diameter larger than that of the connecting portion 16. The first tapered portion 18 is provided with a taper which is gradually moved away from the threaded portion 12, that is, as the first tapered portion 18 is closer to the first support portion 22, the outer diameter gradually increases.

The first straight portion 20 is provided between the first taper portion 18 and the first support portion 22 and unlike the first taper portion 18, each portion is formed to have the same outer diameter. The first rectilinear section 20 is engaged with the inner circumferential surface of the through hole of the balancing object A by the intermediate fit.

The tapered portion and the straight portion are strongly adhered to the inner circumferential surface of the through hole of the balancing object A and a strong frictional force acts on the threaded portion 12 and the precisely machined portion 14. Therefore, The first tapered portion 18, and the first straight portion 20 are coated with a lubricant such as grease.

The first support portion 22 is provided at the other end of the first member 10 and is supported by a bearing (not shown). The first supporting portion 22 is provided with a disassembly jig coupling hole 30 to which a screw of a disassembling jig for disassembling the balancing object A and balancing mandrel is coupled.

The second member 100 is inserted into the through hole of the balancing object A and coupled with the first member 10, and is formed into a rod shape as a whole. 11 and 12, the second member 100 includes a threaded hole 112, a precision machining hole 114, a second tapered portion 118, a second straight line portion 120, and a second And a support portion 122.

The threaded hole 112 is screwed into the threaded portion 12 of the first member 10. For this purpose, a thread corresponding to the threaded portion 12 is formed on the inner circumferential surface of the threaded hole 112.

The precision machining hole 114 is positioned adjacent to the threaded hole 112 with an inner diameter larger than that of the threaded hole 112. The precision machining hole 114 is engaged with the precision machined portion 14 by an intermediate fit so that the first member 10 and the second member 100 are accurately aligned and horizontally aligned with respect to the ground surface, .

The second tapered portion 118 has a taper that gradually increases in outer diameter toward the threaded hole 112 in the precision machining hole 114. The second tapered portion 118 is located at a portion of the precision machining hole 114 and a part of the threaded hole 112.

The second straight portion 120 is provided between the second taper portion 118 and the second support portion 122 and is formed such that each portion has the same outer diameter as the second taper portion 118. The second rectilinear section (120) is engaged with the inner circumferential surface of the through hole of the balancing object (A) by the intermediate fit.

The tapered portion and the straight portion are strongly adhered to the inner circumferential surface of the through hole of the balancing object A and a strong frictional force acts also on the threaded hole 112 and the precision machined hole 114. Therefore, It is preferable that a lubricant such as grease is applied to the inner circumferential surfaces of the machining hole 114, the second tapered portion 118, and the second rectilinear portion 120.

The second support portion 122 is provided at an end of the second member 100 and is supported by a bearing (not shown). Similar to the first support portion 22, the second support portion 122 is also provided with a disassembly jig coupling hole 130 to which a screw of the disassembling jig for disassembling the balancing object A and the balancing mandrel is coupled.

Hereinafter, a process of coupling the assembled balancing mandrel according to the present invention to the balancing object A and a process of disassembling the assembled balancing mandrel according to the present invention from the balancing object A will be briefly described.

In order to attach the assembled balancing mandrel according to the present invention to the balancing object A, the second member 100 is first inserted into the through hole of the balancing object A. The second tapered portion 118 and the second rectilinear portion 120 of the second member 100 are brought into close contact with the inner circumferential surface of the through hole of the balancing object A in this process.

Next, the first member 10 is inserted into the through hole of the balancing object A. The first tapered portion 18 and the first straight portion 20 of the first member 10 are brought into close contact with the inner circumferential surface of the through hole of the balancing object A. [ The threaded portion 12 of the first member 10 is screwed into the threaded hole 112 of the second member 100 when the first member 10 is inserted into the through hole of the balancing object A The first supporting portion 22 of the first member 10 is inserted while being rotated.

When the first member 10 and the second member 100 are screwed together, the precision machined portion 14 of the first member 10 and the precision machined hole 114 of the second member 114 are precisely assembled do.

On the other hand, in order to disassemble the assembled balancing mandrel according to the present invention from the balancing object A, the disassembling jig 200 shown in Fig. 13 can be used.

First, the first support 10 of the first member 10 is rotated to separate the first member 10 from the second member 100.

Next, the housing 210 is fitted to the second support portion 122 of the second member 100 so that the end portion of the housing 210 is brought into close contact with the balancing object A. Next, the disassembling jig 200 is fastened with the disassembling screw 220 to insert the disassembling screw 220 into the disassembling jig fitting hole 130 provided at the end of the second member 100, The first member 10 is separated from the balancing object A when the second member 220 is continuously tightened.

It will be apparent to those skilled in the art that various modifications, substitutions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. will be. Therefore, the embodiments disclosed in the present invention and the accompanying drawings are intended to illustrate and not to limit the technical spirit of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings . The scope of protection of the present invention should be construed according to the following claims, and all technical ideas falling within the scope of the same shall be construed as falling within the scope of the present invention.

10 - first member 12 -
14 - Precision machining part 16 - Connection part
18 - first tapered portion 20 - first straight portion
22 - first support part 100 - second member
112 - Screw coupling ball 114 - Precision machining coupling ball
118 - second taper portion 120 - second straight portion
122 - a second support

Claims (5)

A screw portion having an outer peripheral surface with a screw;
A precision machining portion connected to the threaded portion and having an outer diameter larger than that of the threaded portion, for precision assembly;
A first tapered portion having an outer diameter larger than that of the precision machined portion and having a taper having a gradually increasing outer diameter as the distance from the threaded portion increases; And
And a connecting portion provided between the precision machining portion and the first tapered portion and having an outer diameter larger than that of the precision machined portion and smaller in outer diameter than the first tapered portion,
/ RTI >
And a first member coupled to the through hole of the balancing object, which is a rotating body having a through hole at the center thereof. The method according to claim 1,
Further comprising a first support portion supported by the bearing and having a larger outer diameter than the first taper portion,
And a first straight portion for intermediate fitting is provided between the first taper portion and the first support portion. The method according to claim 1,
A screw coupling hole to be screwed with the screw portion; And
A precision machining engagement hole that is positioned adjacent to the screw engagement hole and has a larger inner diameter than the screw engagement hole,
/ RTI >
And a second member coupled to the through hole of the balancing object, the rotating body having a through hole at the center thereof. 4. The apparatus of claim 3, wherein the second member
Further comprising a second tapered portion that gradually increases in outer diameter from the precision machining hole toward the threaded hole and is positioned over a portion of the precision machining hole and a portion of the threaded hole. 5. The method of claim 4,
Wherein the second member further comprises a second support portion supported by the bearing for rotation and having an outer diameter larger than that of the second taper portion and between the second taper portion and the second support portion, Wherein the balancing mandrel is a balancing mandrel.

KR1020120127464A 2012-11-12 2012-11-12 Assembly type balancing mandrel KR20140060758A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020120127464A KR20140060758A (en) 2012-11-12 2012-11-12 Assembly type balancing mandrel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020120127464A KR20140060758A (en) 2012-11-12 2012-11-12 Assembly type balancing mandrel

Publications (1)

Publication Number Publication Date
KR20140060758A true KR20140060758A (en) 2014-05-21

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020120127464A KR20140060758A (en) 2012-11-12 2012-11-12 Assembly type balancing mandrel

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KR (1) KR20140060758A (en)

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