KR20110125914A - The method of manufacturing gear mold - Google Patents

The method of manufacturing gear mold Download PDF

Info

Publication number
KR20110125914A
KR20110125914A KR1020100045551A KR20100045551A KR20110125914A KR 20110125914 A KR20110125914 A KR 20110125914A KR 1020100045551 A KR1020100045551 A KR 1020100045551A KR 20100045551 A KR20100045551 A KR 20100045551A KR 20110125914 A KR20110125914 A KR 20110125914A
Authority
KR
South Korea
Prior art keywords
core
cavity
manufacturing
mold
hole
Prior art date
Application number
KR1020100045551A
Other languages
Korean (ko)
Other versions
KR101117953B1 (en
Inventor
이종석
Original Assignee
인성 엔프라 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.)
Filing date
Publication date
Application filed by 인성 엔프라 주식회사 filed Critical 인성 엔프라 주식회사
Priority to KR1020100045551A priority Critical patent/KR101117953B1/en
Publication of KR20110125914A publication Critical patent/KR20110125914A/en
Application granted granted Critical
Publication of KR101117953B1 publication Critical patent/KR101117953B1/en

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/24—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
    • B26D1/547—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a wire-like cutting member
    • 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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
    • B29C33/3842—Manufacturing moulds, e.g. shaping the mould surface by machining

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

PURPOSE: A mold manufacturing method for producing a precise gear is provided to minimize the error generated by measurement by processing the rim of a core around a cavity to a circle shape. CONSTITUTION: A mold manufacturing method for producing a precise gear comprises the following steps. A through-hole(3) is formed in the central part of a core(1). A wire cutting machine passes through the through-hole. The central portion of the core is cut to a gear shape. A cavity(2) is formed. The center point of a cavity is set-up. The rim of the core is processed based on the center point of the cavity to a circular shape. The precision is improved by minimizing the error due to measurement.

Description

정밀기어 제조용 금형제작방법{the method of manufacturing gear mold}The method of manufacturing gear mold}

본 발명은 금형의 둘레면과 캐비티의 중심이 동심원을 이루도록 일치되는 정밀도를 향상시킬 수 있도록 된 새로운 정밀기어 제조용 금형제작방법에 관한 것이다.
The present invention relates to a method for manufacturing a mold for manufacturing a new precision gear, which is capable of improving the accuracy of matching the circumferential surface of the mold and the center of the cavity to form a concentric circle.

일반적으로, 지름이 1~5mm 정도인 소형의 정밀기어는 도 1에 도시한 바와 같이 원형의 디스크형상으로 구성된 코어(1)의 중앙부에 기어형태의 캐비티(2)를 형성하여 구성된 금형을 이용하여 합성수지를 사출성형하여 제작된다.In general, a small precision gear having a diameter of about 1 to 5 mm is formed using a mold formed by forming a gear-shaped cavity 2 in the center of the core 1 having a circular disk shape as shown in FIG. Synthetic resin is produced by injection molding.

이와 같이, 정밀기어를 사출성형하는 정밀기어 제조용 금형은 도 2에 도시한 바와 같이, 선반을 이용하여 금형의 재료가 되는 코어(1)의 둘레면을 원형으로 정밀가공한 후(도 2의 (a)), 원형 코어(1)의 중심위치를 측정하여 세팅함과 동시에 코어(1)의 중앙부에 관통공(3)을 형성하고(도 2의 (b)), 와이어커팅기의 와이어를 상기 관통공(3)으로 통과시켜 코어(1)의 중앙부를 기어형태로 커팅하여 캐비티(2)를 성형하므로써 제작된다(도 2의 (c)).Thus, as shown in Figure 2, the mold for manufacturing a precision gear for injection molding the precision gear is precisely processed circularly around the circumferential surface of the core 1 as the material of the mold using a lathe (Fig. a)), the center position of the circular core 1 is measured and set, and a through hole 3 is formed in the center of the core 1 (Fig. 2 (b)), and the wire of the wire cutter is passed through It is produced by forming the cavity 2 by cutting the central portion of the core 1 in the form of a gear by passing it through the ball 3 (Fig. 2 (c)).

이때, 이러한 정밀기어제조용 금형은 후공정인 사출과정에서의 정확도를 높이기 위해, 코어(1)의 중심부와 기어형태의 캐비티(2)가 이루는 원의 중심이 정확히 일치되어, 코어(1)와 캐비티(2)가 동심원을 이루도록 하는 것이 바람직하다.At this time, in order to increase the accuracy in the injection process, the precision gear manufacturing mold, the center of the core and the center of the circle formed by the gear-shaped cavity (2) is exactly the same, the core (1) and the cavity It is preferable to make (2) concentric circles.

그런데, 전술한 금형제작방법에 따르면, 코어(1)의 둘레면을 원형으로 가공한 후 코어(1)의 둘레면을 측정하여 관통공(3)이 형성될 코어(1)의 중심위치를 구하고, 이와 같이 구해진 코어(1)의 중심위치를 기준으로 캐비티(2)의 형성위치를 결정하는 2단계의 측정과정을 거쳐 캐비티(2)를 성형하므로, 측정오차에 의해 케비티의 형성위치에 오차가 발생되어 코어(1)와 캐비티(2)의 중심이 정확한 일치되기 어려운 문제점이 있었다. 즉, 코어(1)의 중심위치를 구할 때 발생되는 오차와, 캐비티(2)의 형성위치를 결정할 때 발생되는 오차가 중복되어 오차가 더욱 커지게 되는 문제점이 있었다.However, according to the above-described mold manufacturing method, after processing the circumferential surface of the core 1 in a circular shape, the circumferential surface of the core 1 is measured to obtain the center position of the core 1 in which the through hole 3 is to be formed. Since the cavity 2 is formed through a two-step measurement process of determining the formation position of the cavity 2 on the basis of the center position of the core 1 thus obtained, an error in the formation position of the cavity due to the measurement error is obtained. There was a problem that the center of the core 1 and the cavity 2 is difficult to match exactly. That is, there is a problem in that the error generated when determining the center position of the core 1 and the error generated when determining the formation position of the cavity 2 overlap each other, thereby increasing the error further.

특히, 이러한 경우, 0.01~0.03mm 정도의 오차가 발생되는데, 최근들어 기어에 요구되는 정밀도가 높아짐에 따라, 코어(1)와 캐비티(2)의 중심이 0.01mm 이내의 오차를 갖는 금형의 필요성이 증가되므로, 보다 높은 정밀도를 갖는 기어제조용 금형을 제작할 수 있는 방법이 필요하게 되었다.
In particular, in this case, an error of about 0.01 to 0.03 mm occurs, and as the precision required for gears increases in recent years, the necessity of a mold in which the center of the core 1 and the cavity 2 has an error within 0.01 mm is required. As this increases, there is a need for a method capable of producing a gear manufacturing die having higher precision.

본 발명은 상기의 문제점을 해결하기 위한 것으로서, 금형의 둘레면과 캐비티(2)의 중심이 동심원을 이루도록 일치되는 정밀도를 향상시킬 수 있도록 된 새로운 정밀기어 제조용 금형제작방법을 제공함에 그 목적이 있다.
SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide a mold manufacturing method for manufacturing a new precision gear, which is capable of improving the accuracy of matching the center of the mold and the center of the cavity 2 to form a concentric circle. .

상기한 목적을 달성하기 위한 본 발명은, 둘레면이 원형을 이루는 코어(1)의 중앙부에 기어형상의 캐비티(2)를 형성하여 이루어진 정밀기어 제조용 금형을 제작하는 금형제작방법에 있어서,The present invention for achieving the above object, in the mold manufacturing method for manufacturing a mold for manufacturing precision gears formed by forming a gear-shaped cavity (2) in the center of the core (1) with a circumferential surface circular,

상기 코어(1)의 중앙부에 관통공(3)을 형성하는 관통공형성단계와;A through hole forming step of forming a through hole (3) in a central portion of the core (1);

상기 관통공(3)으로 와이어커팅기의 와이어를 통과시켜 코어(1)의 중앙부를 기어형태로 커팅하여 캐비티(2)를 형성하는 캐비티형성단계와;Cavity forming step of forming a cavity (2) by cutting the central portion of the core (1) through the wire of the wire cutter to the through hole (3);

상기 캐비티(2)의 중심점을 설정하여 캐비티(2)의 중심점을 기준으로 코어(1)의 둘레면을 원형으로 가공하는 둘레면가공단계;Peripheral surface processing step of setting the center point of the cavity (2) to process the circumferential surface of the core (1) in a circle based on the center point of the cavity (2);

를 포함하는 것을 특징으로 하는 금형제작방법이 제공된다.
There is provided a mold manufacturing method comprising a.

본 발명에 따른 금형제작방법에 따르면, 코어(1)의 중앙부에 관통공(3)을 형성하고, 상기 관통공(3)으로 와이어커팅기의 와이어를 통과시켜 캐비티(2)를 형성한 후, 캐비티(2)를 중심으로 코어(1)의 둘레면을 원형으로 가공하므로, 측정에 의해 발생되는 오차를 최소화하여 정밀도를 향상시킬 수 있는 장점이 있다.
According to the mold manufacturing method according to the present invention, the through hole (3) is formed in the center of the core (1), and through the wire of the wire cutting machine through the through hole (3) to form a cavity (2), the cavity Since the circumferential surface of the core 1 is processed in a circle around (2), there is an advantage in that accuracy can be improved by minimizing an error caused by the measurement.

도 1은 일반적인 정밀기어 제조용 금형을 도시한 사시도,
도 2는 종래의 정밀기어 제조용 금형의 제조방법을 도시한 공정도,
도 3은 본 발명에 따른 정밀기어 제조용 금형의 제조방법을 도시한 공정도이다.1 is a perspective view showing a mold for manufacturing a general precision gear,
2 is a process chart showing a manufacturing method of a mold for manufacturing a conventional precision gear;
Figure 3 is a process chart showing a manufacturing method of a precision gear manufacturing mold according to the present invention.

이하, 본 발명을 첨부된 예시도면에 의거하여 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

도 3은 본 발명에 따른 정밀기어 제조용 금형 제작방법을 도시한 것으로, 상기 금형은 둘레면이 원형을 이루는 코어(1)의 중앙부에 기어형상의 캐비티(2)를 형성하여 이루어진 것은 종래와 동일하다.3 shows a method for manufacturing a mold for manufacturing a precision gear according to the present invention, in which the mold is formed by forming a gear-shaped cavity 2 in the center of the core 1 having a circumferential surface. .

그리고, 본 발명에 따른 상기 금형 제작방법은, 상기 코어(1)에 관통공(3)을 형성하는 관통공형성단계(도 3의 (a))와; 상기 코어(1)의 중앙부에 기어형태로 커팅하여 캐비티(2)를 형성하는 캐비티형성단계(도 3의 (b))와; 상기 코어(1)의 둘레면을 원형으로 가공하는 둘레면가공단계(도 3의 (c))로 이루어진다.In addition, the mold manufacturing method according to the present invention includes a through hole forming step of forming a through hole (3) in the core (1) and (a) of FIG. Cavity forming step (Fig. 3 (b)) to form a cavity (2) by cutting in the form of a gear in the center of the core (1); It consists of a peripheral surface processing step (Fig. 3 (c)) for processing the peripheral surface of the core 1 in a circular shape.

이를 자세히 설명하면, 상기 관통공형성단계는 코어(1)의 중앙부 적정위치에 와이어커팅기의 와이어가 통과하는 관통공(3)을 형성하는 단계이다. 이때, 상기 코어(1)는 외경이 완성된 금형의 외경보다 큰 원형의 디스크형상으로 구성되며, 둘레면은 낮은 정밀도로 1차 가공되어, 후술하는 둘레면가공단계를 거쳐 둘레면이 정밀한 원을 이루도록 가공된다. 상기 관통공(3)은 코어의 중앙부의 적정위치에 상하면을 관통하도록 형성되는 것으로 단순히 와이어커팅기의 와이어가 통과하도록 하는 기능만 할 뿐 위치설정의 기능은 하지 않는다.In detail, the through hole forming step is a step of forming a through hole 3 through which a wire of the wire cutting machine passes at an appropriate position in the center of the core 1. At this time, the core (1) is composed of a circular disk shape larger than the outer diameter of the mold, the outer diameter is completed, the circumferential surface is primarily processed with low precision, through the circumferential surface processing step to be described later the precision circle Processed to achieve. The through hole 3 is formed so as to penetrate the upper and lower surfaces at the proper position of the center portion of the core, it merely serves to allow the wire of the wire cutter to pass, but does not function as a positioning.

상기 캐비티형성단계는 상기 관통공(3)으로 와이어커팅기의 와이어를 통과시켜 코어(1)의 중앙부를 기어형태로 커팅하여 캐비티(2)를 형성하는 단계이다.The cavity forming step is a step of forming a cavity 2 by cutting a central portion of the core 1 in a gear form by passing a wire of a wire cutter to the through hole 3.

상기 둘레면가공단계는 캐비티(2)가 형성된 코어(1)를 선반을 이용하여 2차가공하여, 코어(1)의 둘레면이 원형을 이루도록 정밀가공하는 단계로서, 캐비티(2)의 위치를 측정하여 캐비티(2)의 중앙위치를 설정하고, 설정된 캐비티(2)의 중앙위치를 기준으로 코어(1)를 선반에 설치하여 둘레면을 정밀한 원형태로 가공하여, 코어(1)의 둘레면과 캐비티(2)의 중앙이 정확히 일치되도록 한다.
The circumferential surface processing step is a step of secondary processing the core 1, the cavity 2 is formed by using a lathe, to precisely process the circumferential surface of the core 1 to form a circular, the position of the cavity 2 By measuring and setting the center position of the cavity 2, the core 1 is installed on a lathe based on the set center position of the cavity 2, and the periphery is processed into a precise circular shape, and the periphery of the core 1 Make sure the center of the cavity (2) is exactly the same.

따라서, 표면이 거칠게 가공된 코어(1)의 중앙부에 적정한 크기의 관통공(3)을 형성하고, 관통공(3)을 기준으로 코어(1)의 중앙부에 캐비티(2)를 형성한 후, 선반을 이용하여 코어(1)의 둘레면이 캐비티(2)와 동심을 이루도록 원형으로 정밀가공하여 금형을 제작할 수 있다.
Therefore, after forming the through hole 3 of an appropriate size in the center part of the core 1 with which the surface was roughened, and forming the cavity 2 in the center part of the core 1 with respect to the through hole 3, By using a lathe, the mold can be manufactured by precisely processing a circular shape so that the circumferential surface of the core 1 is concentric with the cavity 2.

이와 같은 금형제작방법에 따르면, 상기 관통공(3)은 단순히 와이어커팅기의 와이어를 통과시키기 위한 기능만 수행하므로 관통공(3)을 형성하기 위한 정확한 위치를 측정할 필요가 없으며, 충분히 지름이 큰 코어(1)에 캐비티(2)를 형성한 후 캐비티(2)의 위치에 따라 코어(1)의 둘레면을 원형으로 가공하므로, 한번의 측정만을 실시한다. 따라서, 측정과정을 최소화하여 측정과정에 발생되는 오차가 겹쳐져 오차가 증폭되는 것을 방지할 수 있으며, 캐비티(2)와 코어(1)의 중심이 일치되는 정밀도를 향상시킬 수 있다.
According to the mold manufacturing method as described above, the through hole 3 merely performs a function for passing the wire of the wire cutting machine, so it is not necessary to measure the exact position for forming the through hole 3, and has a sufficiently large diameter. After the cavity 2 is formed in the core 1, the circumferential surface of the core 1 is circularly formed according to the position of the cavity 2, so that only one measurement is performed. Therefore, by minimizing the measurement process, the error generated in the measurement process may be overlapped to prevent the error from being amplified, and the accuracy of matching the center of the cavity 2 and the core 1 may be improved.

특히, 종래의 방법의 경우, 둘레면이 정밀가공된 코어(1)의 중앙부에 캐비티(2)를 형성하므로, 캐비티(2)의 위치에 오차가 발생될 경우 이를 수정하는 것이 현실적으로 불가능한 반면, 본원발명의 금형제작방법에 따르면, 코어(1)의 중앙부에 캐비티(2)를 형성한 후 캐비티(2)를 중심으로 코어(1)의 둘레면을 정밀가공하므로, 캐비티(2)의 위치에 오차가 발생될 경우 코어(1)의 둘레면을 가공하면서 오차를 수정할 수 있는 장점이 있다.
Particularly, in the conventional method, since the cavity 2 is formed at the center of the core 1 with the circumferential surface precisely processed, it is practically impossible to correct it when an error occurs in the position of the cavity 2. According to the mold manufacturing method of the present invention, since the cavity 2 is formed in the center of the core 1, the peripheral surface of the core 1 is precisely machined around the cavity 2, so that an error in the position of the cavity 2 is caused. When is generated there is an advantage that can correct the error while processing the peripheral surface of the core (1).

1. 코어 2. 캐비티
3. 관통공1. Core 2. Cavity
3. Through hole

Claims (1)

둘레면이 원형을 이루는 코어(1)의 중앙부에 기어형상의 캐비티(2)를 형성하여 이루어진 정밀기어 제조용 금형을 제작하는 금형제작방법에 있어서,
상기 코어(1)의 중앙부에 관통공(3)을 형성하는 관통공형성단계와;
상기 관통공(3)으로 와이어커팅기의 와이어를 통과시켜 코어(1)의 중앙부를 기어형태로 커팅하여 캐비티(2)를 형성하는 캐비티형성단계와;
상기 캐비티(2)의 중심점을 설정하여 캐비티(2)의 중심점을 기준으로 코어(1)의 둘레면을 원형으로 가공하는 둘레면가공단계;
를 포함하는 것을 특징으로 하는 금형제작방법.In the mold manufacturing method of manufacturing the precision gear manufacturing metal mold which forms the gear-shaped cavity 2 in the center part of the core 1 which has a circular peripheral surface,
A through hole forming step of forming a through hole (3) in a central portion of the core (1);
Cavity forming step of forming a cavity (2) by cutting the central portion of the core (1) through the wire of the wire cutter to the through hole (3);
Peripheral surface processing step of setting the center point of the cavity (2) to process the circumferential surface of the core (1) in a circle based on the center point of the cavity (2);
Mold manufacturing method comprising a.
KR1020100045551A 2010-05-14 2010-05-14 the method of manufacturing gear mold KR101117953B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020100045551A KR101117953B1 (en) 2010-05-14 2010-05-14 the method of manufacturing gear mold

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020100045551A KR101117953B1 (en) 2010-05-14 2010-05-14 the method of manufacturing gear mold

Publications (2)

Publication Number Publication Date
KR20110125914A true KR20110125914A (en) 2011-11-22
KR101117953B1 KR101117953B1 (en) 2012-02-15

Family

ID=45395218

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020100045551A KR101117953B1 (en) 2010-05-14 2010-05-14 the method of manufacturing gear mold

Country Status (1)

Country Link
KR (1) KR101117953B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108581079A (en) * 2018-05-28 2018-09-28 刘朝龙 A kind of processing technology of linear cutter precision external tooth

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2968175B2 (en) * 1994-07-13 1999-10-25 アムテック有限会社 Method and apparatus for manufacturing synthetic resin gear mold, and method and apparatus for designing tooth profile of synthetic resin gear mold
JPH1086158A (en) 1996-09-10 1998-04-07 Nippon Koshuha Kogyo Kk Mold
JPH11242081A (en) 1998-11-09 1999-09-07 Casio Comput Co Ltd Gear for synthetic resin-made watch
JP2002035884A (en) 2000-07-25 2002-02-05 Daido Steel Co Ltd Gear die for warm or hot forging and manufacturing method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108581079A (en) * 2018-05-28 2018-09-28 刘朝龙 A kind of processing technology of linear cutter precision external tooth
CN108581079B (en) * 2018-05-28 2020-09-15 刘朝龙 Machining process for machining precise external teeth through linear cutting

Also Published As

Publication number Publication date
KR101117953B1 (en) 2012-02-15

Similar Documents

Publication Publication Date Title
CN103624596A (en) Linear cutting clamp for starter front mounting side
KR101117953B1 (en) the method of manufacturing gear mold
CN102269559A (en) Tool and method for measuring perpendicularity of blind hole to end surface
CN111795645A (en) Accurate tire section binding method
CN207300125U (en) A kind of detection device of nozzle hole depth
CN104476322B (en) The Simple tool setting device and application method of a kind of numerically controlled lathe
CN102357822B (en) Jig for processing automobile air conditioning die circular cutter
CN104002437A (en) High precision rear camera shell mould of automobile
CN104454027B (en) The processing method of power turbine guider
CN104374287A (en) Measuring tool for key groove in conical surface
CN102950190A (en) Production method of sheet metal parts
JP6916518B2 (en) Manufacturing method of injection molding die, molding method by injection molding die, injection molding die and molded product
JP6698790B1 (en) Optical lens plastic injection mold structure
CN202965022U (en) Optical plastic-rubber product mold structure
CN110014119A (en) A kind of combined shaping manufacturing method of metalwork
CN102983690B (en) Manufacturing methods of manual winding mould and mechanical winding mould of single-phase motor
TW201408474A (en) Plastic lens with improved eccentricity and method for manufacturing the same
TWI258420B (en) Mold insert capable of precisely controlling insert thickness and mold apparatus having such mold insert
JP2019177575A5 (en)
JPH04339541A (en) Jig for arranging molds and mold arranging method for making tire forming metallic molds
CN102688945A (en) Step-style middle mold
JP2009148563A (en) Golf ball and die for molding the same
CN109746473A (en) A kind of covering positioning hole forming method
JP2012196807A (en) Manufacturing apparatus and manufacturing method of injection-molded product
CN103009022A (en) Optical plastic product mould core machining technology

Legal Events

Date Code Title Description
A201 Request for examination
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20141210

Year of fee payment: 4

FPAY Annual fee payment

Payment date: 20160126

Year of fee payment: 5

FPAY Annual fee payment

Payment date: 20170201

Year of fee payment: 6

FPAY Annual fee payment

Payment date: 20190410

Year of fee payment: 8

FPAY Annual fee payment

Payment date: 20200203

Year of fee payment: 9