WO2024093405A1 - 阻燃型环氧玻璃布四层压板电路板的自动铣割夹紧装置 - Google Patents

阻燃型环氧玻璃布四层压板电路板的自动铣割夹紧装置 Download PDF

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Publication number
WO2024093405A1
WO2024093405A1 PCT/CN2023/110727 CN2023110727W WO2024093405A1 WO 2024093405 A1 WO2024093405 A1 WO 2024093405A1 CN 2023110727 W CN2023110727 W CN 2023110727W WO 2024093405 A1 WO2024093405 A1 WO 2024093405A1
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WO
WIPO (PCT)
Prior art keywords
circuit board
plate
positioning
base plate
flame
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Application number
PCT/CN2023/110727
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English (en)
French (fr)
Inventor
许世祥
Original Assignee
中国兵器工业集团航空弹药研究院有限公司
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Application filed by 中国兵器工业集团航空弹药研究院有限公司 filed Critical 中国兵器工业集团航空弹药研究院有限公司
Priority to ZA2023/08398A priority Critical patent/ZA202308398B/en
Publication of WO2024093405A1 publication Critical patent/WO2024093405A1/zh

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C3/00—Milling particular work; Special milling operations; Machines therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
    • B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
    • B23Q3/06—Work-clamping means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q7/00—Arrangements for handling work specially combined with or arranged in, or specially adapted for use in connection with, machine tools, e.g. for conveying, loading, positioning, discharging, sorting
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits

Definitions

  • the invention relates to a clamping device for milling and forming a circuit board, in particular to an automatic milling and clamping device for a flame-retardant epoxy glass cloth four-layer board circuit board, belonging to the field of automatic milling of circuit boards.
  • the production sequence of existing circuit boards is: first, the electronic components required for each sub-board are welded on the motherboard, and then the sub-board is manually separated from the motherboard, and then other welding, packaging and other processes are applied to specific products.
  • the manual separation method there are many disadvantages in the manual separation method. First, during the separation process, the connection between the sub-board and the motherboard needs to be destroyed by external force of the hand.
  • the present invention provides an automatic milling and clamping device for a flame-retardant epoxy glass cloth four-layer circuit board to solve the above problems.
  • the positioning clamping component includes a lower positioning plate, a positioning base plate, a compression sponge, an upper clamping plate, two locking blocks and two positioning plate removal handles;
  • the connecting insulation component is installed on the guide support component, the positioning base plate fixing plate is installed on the connecting insulation component, the lower positioning plate is installed on the positioning base plate, the two positioning plate removal handles are fixedly installed on the lower positioning plate, the upper clamping plate is rotatably connected and installed on the positioning base plate, the two locking blocks are installed on the bottom end of the lower positioning plate, and the compression sponge is installed on the inner surface of the upper clamping plate.
  • the present invention uses mechanical structure positioning and clamping, and automatic milling cutter milling, replacing the traditional manual decomposition of the sub-circuit board and the mother circuit board. Since the speed and position of each milling cut remain unchanged, the processing quality of the sub-circuit board after milling is stable and reliable, and the product consistency is good, and there is no need to perform subsequent operations such as polishing on the sub-circuit board.
  • the present application realizes the positioning and clamping of the sub-circuit board and the mother circuit board in the automatic milling process, and can ensure the processing quality of the sub-circuit board processed in one go.
  • the present invention can process four sub-circuit boards in one clamping, and two sets of the present device can realize one-loading-one-processing operation, continuous milling operation can be realized, which greatly improves the processing efficiency and shortens the processing time.
  • Fig. 1 is a front view of the overall structure of the present invention
  • FIG2 is a bottom view of FIG1;
  • Fig. 3 is a left side view of Fig. 1;
  • FIG4 is a front view of the positioning base plate 3-2;
  • Fig. 5 is a left side view of Fig. 4;
  • FIG6 is a front view of the lower positioning plate 3-1
  • FIG7 is a left side view of FIG6
  • FIG8 is a front view of the upper clamping plate 3-6
  • FIG. 9 is a left side view of FIG. 8 .
  • the automatic milling and clamping device for flame-retardant epoxy glass cloth four-layer board circuit board is characterized in that it includes a guide support component 1, a connecting insulation component 2 and a positioning clamping component 3;
  • the positioning clamping component 3 includes a lower positioning plate 3-1, a positioning base plate 3-2, a compression sponge 3-5, an upper clamping plate 3-6, two locking blocks 3-3 and two positioning plate removal handles 3-4;
  • the connecting insulation component 2 is installed on the guide support component 1
  • the positioning base plate 3-2 fixed plate is installed on the connecting insulation component 2
  • the lower positioning plate 3-1 is installed on the positioning base plate 3-2
  • the two positioning plate removal handles 3-4 are fixedly installed on the lower positioning plate 3-1
  • the upper clamping plate 3-6 is rotatably connected and installed on the positioning base plate 3-2
  • the two locking blocks 3-3 are installed on the bottom end of the lower positioning plate 3-1
  • the compression sponge 3-5 is installed on the inner surface of the upper clamping plate 3-6.
  • the positioning base plate 3-2 is
  • the positioning clamping assembly 3 also includes a connecting strip 3-7 and a plurality of connecting hinges 3-8; the connecting strip 3-7 is fixedly mounted on the positioning base plate 3-2, and the upper clamping plate 3-6 is rotatably connected to the connecting strip 3-7 through a plurality of connecting hinges 3-8.
  • the other components and connection methods are the same as those of the specific embodiment 1.
  • the shape correction device for reducing bending rebound under impact load is different from the specific embodiment 1 in that the connecting insulation component 2 includes a base plate 2-1 and two base plate connecting bakelite 2-2; the two base plate connecting bakelite 2-2 are relatively parallel and fixedly installed on the base plate 2-1.
  • Other components and connection methods are the same as those of the specific embodiment 2.
  • Specific embodiment 5 This embodiment is explained in conjunction with Figures 1 to 3. The difference between this embodiment and the specific embodiment 1 is that the two base plate connecting bakelite 2-2 is fixedly connected to the positioning base plate 3-2, and the positioning base plate 3-2 and the base plate 2-1 are respectively arranged on both sides of the two base plate connecting bakelite 2-2.
  • the other components and connection methods are the same as those of the specific embodiment 1.
  • the impact load reduction bending rebound The shape correction device of this embodiment is different from the specific embodiment 1 in that the positioning base plate 3-2 is a rectangular plate body, three positioning plate fixing pins are processed on the positioning base plate 3-2, and three pin holes are processed on the lower positioning plate 3-1. Each pin hole on the lower positioning plate 3-1 is sleeved on the positioning plate fixing pin of the positioning base plate 3-2.
  • Other components and connection methods are the same as those of the specific embodiments 5 or 6.
  • Specific embodiment eight This embodiment is explained in conjunction with Figures 6 and 7.
  • the impact load reduction bending springback correction device described in this embodiment is different from the specific embodiment one in that a circuit board workpiece mounting groove is processed on the lower positioning plate 3-1, and a plurality of circuit board workpiece fixing pins are processed on the circuit board workpiece mounting groove.
  • Each circuit board workpiece fixing pin of the circuit board workpiece mounting groove is arranged correspondingly to the pin hole of the circuit board workpiece, and each pin hole of the circuit board workpiece is installed on the circuit board workpiece fixing pin.
  • the other components and connection methods are the same as those of the specific embodiment seven.
  • a connecting insulation assembly 2 Arranged above the four sliders 1-2 is a connecting insulation assembly 2, a substrate 2-1 and an insulating connecting bakelite 2-2 are the connecting parts of the positioning clamping assembly 3 and the guiding support assembly 1, and at the same time play a role in preventing the static electricity of the guiding support assembly 1 from being transmitted to the positioning clamping assembly 3.
  • a positioning clamping assembly 3 Above the connecting insulation assembly 2 is a positioning clamping assembly 3, which can position and clamp the unmilled mother circuit board, and then automatically mill the mother circuit board.
  • the positioning clamping assembly 3 moves from the processing position to the loading position driven by the slider 1-2.
  • the circuit board After the circuit board is positioned and clamped, it moves from the loading position to the milling position, and the milling cutter starts to mill the connection between the sub- and mother circuit boards according to the predetermined program.
  • the positioning clamping assembly 3 withdraws to the loading position, and the upper clamping plate 3-6 is opened to remove the remaining frames of the sub- and mother circuit boards after the milling operation.
  • the handle 3-4 it is only necessary to remove the handle 3-4 through the positioning plate to replace the lower positioning plate 3-1, remove the connecting screws between the upper clamping plate 3-6 and the connecting hinge 3-8, and replace the new upper clamping plate 3-6.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Jigs For Machine Tools (AREA)
  • Supply And Installment Of Electrical Components (AREA)
  • Laminated Bodies (AREA)

Abstract

一种阻燃型环氧玻璃布四层压板电路板的自动铣割夹紧装置，包括导向支撑组件(1)、连接绝缘组件(2)和定位夹紧组件(3)；定位夹紧组件(3)包括下定位板(3-1)、定位底板(3-2)、压紧海绵(3-5)、上夹紧板(3-6)、两个锁紧块(3-3)和两个定位板取出把手(3-4)；连接绝缘组件(2)安装在导向支撑组件(1)上，定位底板(3-2)固定安装在连接绝缘组件(2)上，下定位板(3-1)安装在定位底板(3-2)上，两个定位板取出把手(3-4)固定安装在下定位板(3-1)上，上夹紧板(3-6)转动连接安装在定位底板(3-2)上。通过机械结构定位夹紧，自动铣刀铣割后的子电路板的加工质量稳定可靠、产品的一致性好，提高了加工效率，降低了工人的劳动强度。

Description

阻燃型环氧玻璃布四层压板电路板的自动铣割夹紧装置 技术领域
本发明涉及一种电路板铣割成型的夹持装置，尤其是涉及阻燃型环氧玻璃布四层压板电路板的自动铣割夹紧装置，属于电路板的自动铣割领域。
背景技术
现有的电路板生产中为了提高生产效率，现有的电路板的生产顺序为：先在母板上焊接好每块子板所需的电子元器件，然后再人工手动将子板从母板上分离出来，然后再经过其他的焊接、封装等流程应用到具体的产品上。然而，人工手动的分离方式存在很多弊端，首先是在分离的过程中需要用手的外力将子板与母板的连接处破坏，人手发力的过程中存在将焊接好的焊点破坏的可能，给子板的质量带来一定的隐患；其次是手工分离的方式劳动强度大，在大批量生产的情况下生产效率低，很难保证生产任务按时完成；再次是人工手动分离后子板与母板连接处的质量参差不齐，难以保证产品的一致性，后续还需对连接处进行打磨，增加了分离的劳动时间。而截至目前为止，尚无可以实现上述功能的装置。
发明内容
本发明为了解决现有技术中电路板的生产时用手的外力将子板与母板的连接处破坏，给子板的质量带来一定的隐患，手工分离的方式劳动强度大，生产效率低，再手动分离后子板与母板连接处的质量参差不齐的问题，进而提供阻燃型环氧玻璃布四层压板电路板的自动铣割夹紧装置解决上述问题。
它包括导向支撑组件、连接绝缘组件和定位夹紧组件；定位夹紧组件包括下定位板、定位底板、压紧海绵、上夹紧板、两个锁紧块和两个定位板取出把手；连接绝缘组件安装在导向支撑组件上，定位底板固定板安装在连接绝缘组件上，下定位板安装在定位底板上，两个定位板取出把手固定安装在下定位板上，上夹紧板转动连接安装在定位底板上，两个锁紧块安装在下定位板底端上，压紧海绵安装在上夹紧板内表面上。
本发明的有益效果是：
1、本发明通过机械结构定位夹紧，自动铣刀铣割，代替了传统手工分解子、母电路板的方式，由于每次铣割的速度、位置不变，铣割后的子电路板的加工质量稳定可靠、产品的一致性好，后续无需再对子电路板进行打磨等操作。本申请实现子、母电路板自动铣割过程的定位、夹紧，并且能够保证一次性加工出来的子电路板的加工质量。
2、由于本发明是一次装夹可加工出四块子电路板，而且两套本装置即可实现一上料一加工的操作，可实现连续铣割操作，极大的提高了加工效率，缩短了加工时间。
3、由于本发明只需要上料、装夹的操作后即可出成品，相比传统的手工分解方式极大的降低了工人的劳动强度，提高了其作业环境。
附图说明
图1是本发明整体结构主视图；
图2是图1的仰视图；
图3是图1的左视图；
图4是定位底板3-2主视图；
图5是图4的左视图；
图6是下定位板3-1主视图；
图7是图6的左视图；
图8是上夹紧板3-6主视图；
图9是图8的左视图。
具体实施方式
具体实施方式一：结合图1-图9说明本实施方式，所述阻燃型环氧玻璃布四层压板电路板的自动铣割夹紧装置,其特征在于：它包括导向支撑组件1、连接绝缘组件2和定位夹紧组件3；定位夹紧组件3包括下定位板3-1、定位底板3-2、压紧海绵3-5、上夹紧板3-6、两个锁紧块3-3和两个定位板取出把手3-4；连接绝缘组件2安装在导向支撑组件1上，定位底板3-2固定板安装在连接绝缘组件2上，下定位板3-1安装在定位底板3-2上，两个定位板取出把手3-4固定安装在下定位板3-1上，上夹紧板3-6转动连接安装在定位底板3-2上，两个锁紧块3-3安装在下定位板3-1底端上，压紧海绵3-5安装在上夹紧板3-6内表面上。定位底板3-2为长方形框体。
具体实施方式二：结合图1-图3说明本实施方式，所述一种冲击载荷消减弯曲回弹的校形装置，本实施方式与具体实施方式一不同点在于定位夹紧组件3还包括连接条3-7和多个连接折页3-8；连接条3-7固定安装在定位底板3-2上，上夹紧板3-6通过多个连接折页3-8与连接条3-7转动连接。其它组成和连接方式与具体实施方式一相同。
具体实施方式三：结合图1-图3说明本实施方式，所述一种冲击载荷消减弯曲回弹的校形装置，本实施方式与具体实施方式一不同点在于导向支撑组件1包括两个滑轨1-1和四个滑块1-2；每个滑轨1-1上滑动设置有两个滑块1-2，四个滑块1-2固定安装在连接绝缘组件2上。其它组成和连接方式与具体实施方式一相同。
具体实施方式四：结合图1-图3说明本实施方式，所述一种冲击载荷消减弯曲回弹的校形装置，本实施方式与具体实施方式一不同点在于连接绝缘组件2包括基板2-1和两个基板连接电木2-2；两个基板连接电木2-2相对平行固定安装在基板2-1上。其它组成和连接方式与具体实施方式二相同。
具体实施方式五：结合图1-图3说明本实施方式，所述一种冲击载荷消减弯曲回弹的校形装置，本实施方式与具体实施方式一不同点在于两个基板连接电木2-2与定位底板3-2固定连接，定位底板3-2和基板2-1分别设置在两个基板连接电木2-2的两侧。其它组成和连接方式与具体实施方式一相同。
具体实施方式六：结合图1-图3说明本实施方式，所述一种冲击载荷消减弯曲回弹的校形装置，本实施方式与具体实施方式一不同点在于锁紧块3-3的一端转动连接安装在下定位板3-1上，锁紧块3-3的另一端加工有卡紧板。其它组成和连接方式与具体实施方式五相同。
具体实施方式七：结合图1-图7说明本实施方式，所述一种冲击载荷消减弯曲回弹 的校形装置，本实施方式与具体实施方式一不同点在于定位底板3-2为长方形板体，定位底板3-2上加工有三个定位板固定销，下定位板3-1上加工有三个销孔，下定位板3-1上的每个销孔套装在定位底板3-2的定位板固定销上。其它组成和连接方式与具体实施方式五或六相同。
具体实施方式八：结合图6和图7说明本实施方式，所述一种冲击载荷消减弯曲回弹的校形装置，本实施方式与具体实施方式一不同点在于下定位板3-1上加工有电路板工件安装槽，电路板工件安装槽上加工有多个电路板工件固定销轴，电路板工件安装槽的每个电路板工件固定销轴与电路板工件的销轴孔对应设置，电路板工件的每个销轴孔安装在在电路板工件固定销轴上。其它组成和连接方式与具体实施方式七相同。
具体实施方式九：结合图1-图3说明本实施方式，所述一种冲击载荷消减弯曲回弹的校形装置，本实施方式与具体实施方式一不同点在于电路板工件安装在电路板工件安装槽上，上夹紧板3-6扣压在电路板工件上，且压紧海绵3-5设置在电路板工件和上夹紧板3-6之间的上夹紧板3-6侧面上。其它组成和连接方式与具体实施方式五相同。本申请中两滑轨1-1和四个滑块1-2构成导向支撑组件，是整个装置的底部支撑机构，同时是整个装置在上料与铣割位置之间运动的导向机构。在四个滑块1-2上面布置的是连接绝缘组件2，一块基板2-1和绝缘连接电木2-2是定位夹紧组件3与导向支撑组件1的连接件，同时起到防止导向支撑组件1的静电传导到定位夹紧组件3的作用。在连接绝缘组件2上方为定位夹紧组件3，它可以对未铣割的母电路板进行定位并将其夹紧，然后对母电路板进行自动铣割操作。
工作原理
开始铣割电路板，定位夹紧组件3在滑块1-2的带动下由加工位置移动到上料位置。旋转锁紧块3-3解除上夹紧板3-6的锁紧，打开上夹紧板3-6后将待铣割的电路板放置到下定位板3-1的凹槽内，使下定位板3-1上全部的定位销轴都能够穿入到电路板上的定位孔内，将上夹紧板3-6盖上，使压紧海绵3-5能过压紧电路板，旋转锁紧块3-3锁紧上夹紧板3-6。电路板定位夹紧后由上料位置移动到铣割位置，在预定程序下铣刀开始对子、母电路板的连接处进行铣割作业。铣割作业完毕后，定位夹紧组件3退出到上料位置，打开上夹紧板3-6取出铣割作业后的子电路板及母电路板剩余边框。在需要加工不同型号电路板时，只需通过定位板取出把手3-4更换下定位板3-1，取下上夹紧板3-6与连接折页3-8之间的连接螺钉，更换新的上夹紧板3-6可。

Claims (9)

  1. 阻燃型环氧玻璃布四层压板电路板的自动铣割夹紧装置,其特征在于：它包括导向支撑组件(1)、连接绝缘组件(2)和定位夹紧组件(3)；定位夹紧组件(3)包括下定位板(3-1)、定位底板(3-2)、压紧海绵(3-5)、上夹紧板(3-6)、两个锁紧块(3-3)和两个定位板取出把手(3-4)；连接绝缘组件(2)安装在导向支撑组件(1)上，定位底板(3-2)固定板安装在连接绝缘组件(2)上，下定位板(3-1)安装在定位底板(3-2)上，两个定位板取出把手(3-4)固定安装在下定位板(3-1)上，上夹紧板(3-6)转动连接安装在定位底板(3-2)上，两个锁紧块(3-3)安装在下定位板(3-1)底端上，压紧海绵(3-5)安装在上夹紧板(3-6)内表面上。
  2. 根据权利要求1所述阻燃型环氧玻璃布四层压板电路板的自动铣割夹紧装置,其特征在于：定位夹紧组件(3)还包括连接条(3-7)和多个连接折页(3-8)；连接条(3-7)固定安装在定位底板(3-2)上，上夹紧板(3-6)通过多个连接折页(3-8)与连接条(3-7)转动连接。
  3. 根据权利要求1所述阻燃型环氧玻璃布四层压板电路板的自动铣割夹紧装置,其特征在于：导向支撑组件(1)包括两个滑轨(1-1)和四个滑块(1-2)；每个滑轨(1-1)上滑动设置有两个滑块(1-2)，四个滑块(1-2)固定安装在连接绝缘组件(2)上。
  4. 根据权利要求1所述阻燃型环氧玻璃布四层压板电路板的自动铣割夹紧装置,其特征在于：连接绝缘组件(2)包括基板(2-1)和两个基板连接电木(2-2)；两个基板连接电木(2-2)相对平行固定安装在基板(2-1)上。
  5. 根据权利要求3或4所述阻燃型环氧玻璃布四层压板电路板的自动铣割夹紧装置,其特征在于：两个基板连接电木(2-2)与定位底板(3-2)固定连接，定位底板(3-2)和基板(2-1)分别设置在两个基板连接电木(2-2)的两侧。
  6. 根据权利要求1所述阻燃型环氧玻璃布四层压板电路板的自动铣割夹紧装置,其特征在于：锁紧块(3-3)的一端转动连接安装在下定位板(3-1)上，锁紧块(3-3)的另一端加工有卡紧板。
  7. 根据权利要求1所述阻燃型环氧玻璃布四层压板电路板的自动铣割夹紧装置,其特征在于：定位底板(3-2)为长方形板体，定位底板(3-2)上加工有三个定位板固定销，下定位板(3-1)上加工有三个销孔，下定位板(3-1)上的每个销孔套装在定位底板(3-2)的定位板固定销上。
  8. 根据权利要求7所述阻燃型环氧玻璃布四层压板电路板的自动铣割夹紧装置,其特征在于：下定位板(3-1)上加工有电路板工件安装槽，电路板工件安装槽上加工有多个电路板工件固定销轴，电路板工件安装槽的每个电路板工件固定销轴与电路板工件的销轴孔对应设置，电路板工件的每个销轴孔安装在在电路板工件固定销轴上。
  9. 根据权利要求7所述阻燃型环氧玻璃布四层压板电路板的自动铣割夹紧装置,其特征在于：电路板工件安装在电路板工件安装槽上，上夹紧板(3-6)扣压在电路板工件上，且压紧海绵(3-5)设置在电路板工件和上夹紧板(3-6)之间的上夹紧板(3-6)侧面上。
PCT/CN2023/110727 2022-11-01 2023-08-02 阻燃型环氧玻璃布四层压板电路板的自动铣割夹紧装置 WO2024093405A1 (zh)

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