WO2008072834A1

WO2008072834A1 - Method for manufacturing anode of magnetron and mold therefor

Info

Publication number: WO2008072834A1
Application number: PCT/KR2007/004856
Authority: WO
Inventors: Bonsu Ku; Seongjin Yuk
Original assignee: Pretech Co., Ltd.
Priority date: 2006-12-11
Filing date: 2007-10-05
Publication date: 2008-06-19
Also published as: KR100751896B1

Abstract

Discloses is a method for manufacturing a magnetron anode and a mode used for the same. The method for manufacturing a magnetron anode, which includes the steps of: (a) inserting a copper disk having a predetermined thickness into a forming hole of a die; (b) pressing the copper disk by an upper punch and a lower punch which are assembled with upper and lower parts of a press machines, respectively; and (c) forming the copper disk into a magnetron anode including a body and a vane through pressing of the upper punch and the lower punch. The body and the vanes of the magnetron anode are integrally formed through a mono-process preformed one time, so that a high frequency generation performance of an anode is improved, quality is improved due to decrease of an error rate, and working time and processes are reduced. Therefore, efficiency in producing a magnetron anode increases.

Description

METHOD FOR MANUFACTURING ANODE OF MAGNETRON

AND MOLD THEREFOR

Technical Field

[1] The present invention relates to a method for manufacturing a magnetron anode, and particularly to a method for manufacturing a magnetron anode having a body and a vane which are integrally formed by performing a mono-process one time, and a mold for the method. The magnetron anode is manufactured without undergoing through a process for forming an upper body, a process for forming an upper vane integrally with the upper body, a process for forming a lower body, a process for forming a lower bane integrally with the lower body, and a process for joining the upper body formed integrally with the upper vane to the lower body formed integrally with the lower vane, etc. Background Art

[2] In general, a Microwave Oven is a cooking appliance using an electric wave dispersion method, which uses a magnetron oscillating an ultrahigh frequency (UHF) in a magnetic filed.

[3] Such a magnetron includes an anode, a negative part, and a magnetic part. The anode includes a body having a cylindrical shape, a plurality of vanes joined with the inner wall of the body while having radial shape, and at least one strap ring. Herein, a strap groove is formed at the plurality of vanes for coupling at least one strap ring.

[4] In manufacturing such an anode, a body and a vane are formed, respectively, a plurality of vanes are accurately and radially arranged on the body, and then the body and the vanes have to be joined with each other, so that working time and many processes are required.

[5] So as to resolve the problem, Korea patent Laid-Open Publication No.

10-2004-89587 discloses the method for manufacturing a magnetron anode and a forming device used for manufacturing. According to the method, a body and a vane of a magnetron anode are integrally formed. In order to accomplish this, the body and vane are divided into an upper part and a lower part so as to be formed as shown in FIG. 1, and then the upper and lower parts are joined with each other, respectively.

[6] Because of this method, a process of accurately arranging a plurality of vanes at the body in a radial shape and then joining the vanes to the body is not necessary. Therefore, working time and processes are further reduced in comparison with the conventional method. However, so as to form a body and a vane after dividing them into each upper part and each lower part, particularly after dividing the body into an upper body 110 having an upper vane 115 integrally formed therewith and a lower body 120 having a lower vane 125 integrally formed therewith, a process of sequentially forging a copper disk having a predetermined thickness by means of punches having a predetermined shape has to be repeatedly performed two times, and the upper body 110 and the lower body 120 is joined to each other after lower surfaces of the upper body 110 and the lower body 120 are cut. Particularly, a magnetron anode has to undergo a process for forming an upper body, a process for forming an upper vane integrally with the upper body, a process for forming a lower body, a process for forming a lower vane integrally with the lower body, and a process for joining the upper body formed integrally with the upper vane to the lower body formed integrally with the lower vane. Therefore, there is a problem in that working time and processes can not be remarkably reduced in comparison with the conventional art, and leak can be also generated at a joining part between the upper body and the lower body after a braising joining.

[7] In general, a Microwave Oven is a cooking appliance using an electric wave dispersion method, which uses a magnetron oscillating an ultrahigh frequency (UHF) in a magnetic filed.

[8] Such a magnetron includes an anode, a negative part, and a magnetic part. The anode includes a body having a cylindrical shape, a plurality of vanes joined with the inner wall of the body while having radial shape, and at least one strap ring. Herein, a strap groove is formed at the plurality of vanes for coupling at least one strap ring.

[9] In manufacturing such an anode, a body and a vane are formed, respectively, a plurality of vanes are accurately and radially arranged on the body, and then the body and the vanes have to be joined with each other, so that working time and many processes are required.

[10] So as to resolve the problem, Korea patent Laid-Open Publication No.

[11] Because of this method, a process of accurately arranging a plurality of vanes at the body in a radial shape and then joining the vanes to the body is not necessary. Therefore, working time and processes are further reduced in comparison with the conventional method. However, so as to form a body and a vane after dividing them into each upper part and each lower part, particularly after dividing the body into an upper body 110 having an upper vane 115 integrally formed therewith and a lower body 120 having a lower vane 125 integrally formed therewith, a process of sequentially forging a copper disk having a predetermined thickness by means of punches having a pre- determined shape has to be repeatedly performed two times, and the upper body 110 and the lower body 120 is joined to each other after lower surfaces of the upper body 110 and the lower body 120 are cut. Particularly, a magnetron anode has to undergo a process for forming an upper body, a process for forming an upper vane integrally with the upper body, a process for forming a lower body, a process for forming a lower vane integrally with the lower body, and a process for joining the upper body formed integrally with the upper vane to the lower body formed integrally with the lower vane. Therefore, there is a problem in that working time and processes can not be remarkably reduced in comparison with the conventional art, and leak can be also generated at a joining part between the upper body and the lower body after a braising joining. Disclosure of Invention Technical Problem

[12] The present invention has been made in view of the above-mentioned problems, and the present invention provides a method for manufacturing a magnetron anode having a body and all vanes which are integrally formed by performing a mono-process one time and a mold for the method. The magnetron anode is manufactured without undergoing a process for forming an upper body, a process for forming an upper vane integrally with the upper body, a process for forming a lower body, a process for forming a lower bane integrally with the lower body, and a process for joining the upper body formed integrally with the upper vane to the lower body formed integrally with the lower vane, etc.

Technical Solution

[13] In accordance with an aspect of the present invention, there is provided a method for manufacturing a magnetron anode, which includes the steps of: (a) inserting a copper disk having a predetermined thickness into a forming hole of a die; (b) pressing the copper disk by an upper punch and a lower punch which are assembled with upper and lower parts of a press machines, respectively; and (c) forming the copper disk into a magnetron anode including a body and a vane through pressing of the upper punch and the lower punch.

[14] In accordance with another aspect of the present invention, there is provided a mold for the method for manufacturing a magnetron anode including an upper punch and a lower punch having a cylinder- shaped body, which have a plurality of vane forming grooves radically formed at a pressure surface of the body pressing the a copper disk a predetermined thickness, a strap groove-forming protuberance formed at each lower surface of the plurality of vane forming grooves, and the antenna groove-forming protuberance formed at a lower surface of at least one vane forming groove among the plurality of vane forming grooves. [15]

Brief Description of the Drawings

[16] The foregoing and other objects, features and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which:

[17] FIG. 1 is a perspective view illustrating a conventional magnetron anode;

[18] FIG, 2a is a sectional view illustrating a mold for forming a magnetron anode according to an exemplary embodiment of the present invention;

[19] FIG. 2b is a perspective view illustrating a punch used for forming a magnetron anode according to an exemplary embodiment of the present invention;

[20] FIG. 3a is a sectional view illustrating a magnetron anode according to an exemplary embodiment of the present invention;

[21] FIG. 3b is a perspective view illustrating a magnetron anode according to an exemplary embodiment of the present invention; and

[22] FIG. 4 is a flow chart illustrating a process of manufacturing a magnetron anode according to an exemplary embodiment of the present invention. Mode for the Invention

[23] Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, the same elements will be designated by the same reference numerals although they are shown in different drawings. Further, 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.

[24] FIG, 2a is a sectional view illustrating a mold for forming a magnetron anode according to an exemplary embodiment of the present invention.

[25] A mold for forging a magnetron anode according to an exemplary embodiment of the present invention includes an upper punch 210, a lower punch 220, and a die 230, etc.

[26] The upper punch 210 and the lower punch 220 presses a copper disk 240 inserted into a forming hole of the die 230 in upper and lower directions so that the copper disk 240 is formed into a magnetron anode 300 having a body 310, a first vane 322, and a second vane 324, which are integrally formed.

[27] The upper punch 210 and the lower punch 220 have a body of a cylindrical shape, and a plurality of vane forming grooves are formed at a pressure surface for pressuring the copper disk 240 inserted into the die 230. A strap groove-forming protuberance is formed at each lower surface of the plurality of vane forming grooves, a punch having an antenna groove-forming protuberance formed at a lower surface of at least one vane forming groove among the plurality of vane forming grooves is assembled with the upper and lower part of a press machine (not shown). Herein, the upper punch 210 and the lower punch 220 are positioned in such a manner that a pressure surface of the upper punch 210 and a pressure surface of the lower punch 220 are opposite to each other in upper and lower direction while centering the copper disk 240 inserted into the die 230. At this time, in a state where an antenna groove-forming protuberance of the upper punch 210 and an antenna groove-forming protuberance of the lower punch 220 are positioned in the same direction based on each pressure surface, the upper and lower punches are assembled with the press machine (not shown).

[28] Such structure will be described in more detail with reference to FIG. 2a. The pressure surface of the upper punch 210 and the pressure surface of the lower punch 220, which are assembled with the press machine (not shown), are opposite to each other while centering the copper disk 240. Accordingly, when the upper antenna groove-forming protuberance 218 is positioned (formed) at a left side in a view toward the copper disk 240 from the upper punch 210, the lower antenna groove-forming protuberance 228 is also positioned at a left side in a view toward the copper disk 240 from the pressure surface of the lower punch 220.

[29] In FIG. 2a, the plurality of vane forming grooves formed at pressure surfaces of the upper punch 210 and the lower punch 220, respectively, the strap groove- forming protuberance, and the antenna groove-forming protuberance are divided into the first vane forming groove 212 and the second vane forming groove 214, the upper strap groove- forming protuberance 216 and the upper antenna groove-forming protuberance 218, which are positioned at the upper punch 210, the third vane forming groove 222, the fourth vane forming groove 224, the lower strap forming protuberance 226, and the lower antenna groove-forming protuberance 228, which are positioned at the lower punch 220. The purpose of this division is to make it easy to describe the upper punch 210 and lower punch, and it is not because the upper punch 210 and the lower punch 220 are not the same.

[30] Herein, among the first vane forming groove 212, the second vane forming groove

214, the third vane forming groove 222, and the fourth vane forming groove 224, which are radially formed at the pressure surface of the upper punch 210 and the lower punch 220, respectively, the first vane forming groove 212 refers to a vane forming groove having a lower surface at which the upper strap groove-forming protuberance 216 is formed, and the third vane forming groove 222 refers to a vane forming groove having a lower surface at which the lower strap groove-forming protuberance 226 are formed. Also, the second vane forming groove 214 refers to a vane forming groove having a lower surface at which the upper strap groove-forming protuberance 216 and the upper antenna groove-forming protuberance 218 are formed, and the fourth vane forming groove 224 refers to a vane forming groove at which the lower strap groove- forming protuberance 226 and the lower antenna groove- forming protuberance 228 are formed.

[31] At a result, the first vane forming groove 212 of the upper punch 210 is the same as the third vane forming groove 222 of the lower punch 220, and the second vane forming groove 214 of the upper punch 210 is the same as the fourth forming groove 224 of the lower punch 220.

[32] The plurality of vane forming grooves, the strap groove-forming protuberances, and the antenna groove- forming protuberances, which are formed at a punch according to the exemplary embodiment of the present invention, particularly at the upper punch 210 and the lower punch 220, have the same structure as a conventional strap groove-forming protuberance and a conventional antenna groove-forming protuberance. Therefore, description of structures of the plurality of vane forming grooves, and the strap groove-forming protuberances, and the antenna groove-forming protuberances, which are formed at the upper punch 210 and the lower punch 220, will be omitted in the present invention.

[33] FIG. 2b is a perspective view illustrating a punch used for forming a magnetron anode according to an exemplary embodiment of the present invention.

[34] The upper punch 210 and the lower punch 220 according to the exemplary embodiment of the present invention have a cylinder- shaped body. A plurality of the first vane forming grooves 212 and a plurality of the second vane forming grooves 214 are formed at the pressure surface of the upper punch 210. A plurality of the third vane forming grooves 222 and a plurality of the fourth vane forming grooves 224 are formed at the pressure surface of the lower punch 210. The upper strap groove-forming protuberance 216 and the lower strap groove-forming protuberance 226 are formed at the lower surfaces of the first vane forming groove 212 and the third vane forming groove 222, respectively. The upper strap groove-forming protuberance 216 and the upper antenna groove-forming protuberance 218 are formed at the lower surface of the second vane forming groove 214. The lower strap groove-forming protuberance 226 and the lower antenna groove-forming protuberance 228 are formed at the lower surface of the fourth vane forming groove 224. The above-described structure can be known through the description of FIG. 2a.

[35] FIG. 4 is a flow chart illustrating a process of manufacturing a magnetron anode according to an exemplary embodiment of the present invention.

[36] Firstly, the upper punch 210 and the lower punch 220 are assembled with a crank shaft or a piston which is positioned at the upper and lower parts of a press machine (not shown), respectively (S410). Herein, in a case where the upper punch 210 and the lower punch 220 press the copper disk 240, if the first vane forming groove 212 and the second vane forming groove 214 of the upper punch 210 do not accurately correspond to, i.e. are not accurately assembled with the third vane forming groove 222 and the fourth vane forming groove 224 of the lower punch 220, shapes of the plurality of the first vanes 322 and the second vanes 324 are abnormally formed. Therefore, the upper punch and the lower punch 220 are assembled in such a manner that the first vane forming groove 212, the second vane forming groove 214 of the upper punch 210, the third vane forming groove 222, and the fourth vane forming 224 of the lower punch accurately correspond to each other.

[37] The copper disk 240 having a predetermined thickness is inserted into a forming hole of the die 230 as shown in FIG. 2a (S420).

[38] As shown in FIG. 2a, when the upper punch 210 and the lower punch 220 are moved by the crank shaft or the piston of the press machine (not shown) in a direction of an arrow so as to press the copper disk 240, the copper disk 240 is plastically deformed by the second vane forming groove 214 and the third vane forming groove 222 so that a plurality of the first vanes 322 are formed as shown in FIG. 3a and FIG. 3b, the copper disk 240 is plastically deformed by the first vane forming groove 212 and the fourth vane forming groove 224 so that a plurality of the second vanes 324 are formed, and the copper disk 240 is plastically deformed by a gap between the upper punch 210, the lower punch 220, and the die 230 so that a body 310 is formed (S430).

[39] At this time, an upper strap groove 326 and an antenna groove 328 of the upper side of the first vane 322 are formed by the upper strap groove-forming protuberance 216 and the upper antenna groove-forming protuberance 218 which are formed at the lower surface of the second vane forming groove 214, a strap groove 326 is formed by the lower strap groove-forming protuberance 226 formed at the lower surface of the thrid vane forming groove 222, and a second vane 324 is formed while having a shape having upper and lower parts positioned opposite to the upper and lower parts of the first vane 322. Particularly, a strap groove 326 is formed at the upper side of the second vane 324 by the upper strap groove-forming protuberance 216 formed at the lower surface of the first vane forming groove 212. A strap groove 326 and an antenna groove 328 are formed by the lower strap groove-forming protuberance 226 and the lower antenna groove-forming protuberance 218 which are formed at the lower surface of the fourth vane forming groove 224.

[40] After the upper punch 210 and the lower punch 220 are moved in a direction opposite to the direction of the arrow as shown in FIG. 2a, a magnetron anode 300 inserted into the forming hole of the die 230 is extracted and then undergoes a after- process. As a result, manufacturing the magnetron anode 300 as shown in FIG. 3b is complete (S440). Herein, the after-process refers to a cutting process and a polishing process so as to smooth down residual substances (not shown) on the copper disk, which attaches to a contact surface where the upper punch 210 and the lower punch 220 make contact with each other, and various kinds of grooves and the surface of the magnetron anode 300 when the upper punch 210 and the lower punch 220 press the copper disk 240.

[41] For convenience in description, a structure of the present invention is limited as described below. So as to form a strap groove 324 at upper and lower parts of the first vane 322 and the second vane 324, one upper strap groove-forming protuberance 216 and one lower strap groove-forming protuberance 226 are formed at each lower surface of the first vane forming groove 212, the second vane forming groove 214, the third vane forming groove 222, and the fourth vane forming groove 224, and one upper antenna groove-forming protuberance 218 and one lower antenna groove-forming protuberance 228 are formed at the lower surfaces of the second vane forming groove 214 and the fourth vane forming groove 224, respectively.

[42] In a case where the present invention is actually applied, the present invention is not limited by the above-described structure. According to the designer requirements, at least one upper strap groove-forming protuberance 216 and/or at least one lower strap groove- forming protuberance 226 can be formed, and at least one upper antenna groove-forming protuberance 218 and/or at least one lower antenna groove-forming protuberance 228 can be formed.

[43] While the present invention has been shown and described with reference to certain exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Accordingly, the scope of the invention is not to be limited by the above embodiments but by the claims and the equivalents thereof. Industrial Applicability

[44] According to the present invention as described above, a body and a vane of the magnetron anode are integrally formed through a mono-process preformed one time, so that a high frequency generation performance of an anode is improved, quality is improved due to decrease of an error rate, and working time and processes are reduced. Therefore, efficiency in producing a magnetron anode increases.

Claims

[1] A method for manufacturing a magnetron anode, comprising the steps of:

(a) inserting a copper disk having a predetermined thickness into a forming hole of a die;

(b) pressing the copper disk by an upper punch and a lower punch which are assembled with upper and lower parts of a press machines, respectively; and

(c) forming the copper disk into a magnetron anode including a body and a vane through pressing of the upper punch and the lower punch.

[2] The method for manufacturing a magnetron anode as claimed in claim 1, wherein, in step (b), the upper punch and the lower punch have a pressure surface for pressing the copper disk, at which a plurality of vane forming grooves are formed, a strap groove-forming protuberance is formed at each lower surface of the plurality of vane forming grooves, and an antenna groove-forming protuberance is formed at a lower surface of at least one vane forming groove among the plurality of vane forming grooves.

[3] The method for manufacturing a magnetron anode as claimed in claim 1, wherein, in step (c), at least one strap groove is formed at upper and lower parts of the vane, and at least one antenna groove is formed at any one of the upper and lower parts of the vane.

[4] A mold for manufacturing a magnetron anode comprises an upper punch and a lower punch having a cylinder- shaped body, which have a plurality of vane forming grooves radically formed at a pressure surface of the body pressing the a copper disk having a predetermined thickness, a strap groove-forming protuberance formed at each lower surface of the plurality of vane forming grooves, and the antenna groove-forming protuberance formed at a lower surface of at least one vane forming groove among the plurality of vane forming grooves.

[5] The mold for manufacturing a magnetron anode as claimed in claim 4, further comprising a die including a forming hole into which the copper disk is inserted when the copper disk is pressured by the punches.