CN116673704A - Liquid cooling plate processing technology and brazing flux coating equipment - Google Patents

Liquid cooling plate processing technology and brazing flux coating equipment Download PDF

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Publication number
CN116673704A
CN116673704A CN202310966439.9A CN202310966439A CN116673704A CN 116673704 A CN116673704 A CN 116673704A CN 202310966439 A CN202310966439 A CN 202310966439A CN 116673704 A CN116673704 A CN 116673704A
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CN
China
Prior art keywords
coating
substrate
plate
liquid cooling
welding
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
CN202310966439.9A
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Chinese (zh)
Inventor
李刚
李乐
刘迎春
王毅博
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Changzhou Hengchuang Heat Management Co ltd
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Changzhou Hengchuang Heat Management Co ltd
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 Changzhou Hengchuang Heat Management Co ltd filed Critical Changzhou Hengchuang Heat Management Co ltd
Priority to CN202310966439.9A priority Critical patent/CN116673704A/en
Publication of CN116673704A publication Critical patent/CN116673704A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00Soldering, e.g. brazing, or unsoldering
    • B23K1/008Soldering within a furnace
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K3/00Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
    • B23K3/08Auxiliary devices therefor
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electric Connection Of Electric Components To Printed Circuits (AREA)

Abstract

The application provides a liquid cooling plate processing technology, which comprises the following steps: s1: stamping the first substrate to enable the surface of the first substrate to be downwards recessed to form a flow passage area, wherein welding areas are arranged outside the flow passage area; s2: fixing the first substrate in the coating equipment; s3: covering the first substrate with a coating plate, and arranging a plurality of coating holes on the coating plate corresponding to the welding areas; s4: uniformly brushing brazing flux on the coated plate; s5: covering the second substrate on the first substrate, and placing the second substrate into a brazing furnace for welding and fixing; s6: and (5) carrying out quality inspection and packaging on the welded and molded liquid cooling plate. The brazing flux coating mode adopts a coating plate printing method, a brazing flux coating area is designed on the coating plate aiming at a welding area, the brazing flux is accurately printed at a designated position, and the brazing flux is prevented from being coated on a non-welding area, so that the internal cleanliness of a cold plate after welding is greatly improved, the brazing flux consumption is greatly saved, the production cost is reduced, and the quality of products is ensured.

Description

Liquid cooling plate processing technology and brazing flux coating equipment
Technical Field
The application relates to the technical field of liquid cooling plate processing, in particular to a liquid cooling plate processing technology and brazing flux coating equipment.
Background
In the prior art, with the continuous increase of the heat dissipation requirement in the new energy field, the continuous improvement of the heat dissipation requirement, the liquid cooling and direct cooling heat dissipation become the main stream in the new energy heat dissipation field, and the heat dissipation system has very high requirements on performance indexes such as the internal cleanliness and the like, and the exceeding of the cleanliness of the liquid cooling plate has great influence on the normal operation and the service life of the heat dissipation system; and then put forward higher requirement to the inside cleanliness of liquid cooling board self, and the course of working and the processing technology of liquid cooling board have played decisive role to its inside cleanliness.
The conventional cold plate is usually of a flat plate structure, the upper plate and the lower plate are welded by brazing, wherein the composite surface of the runner plate is required to be coated with brazing flux for auxiliary brazing; the conventional coating mode of the runner plate is full-face spraying, and the brazing flux is sprayed on the runner area and the welding area, so that the inside cleanliness of the welded cold plate is poor, and the higher standard of a heat dissipation system is difficult to meet. Therefore, it is necessary to provide a liquid cooling plate processing technology and a flux coating apparatus to overcome the above-mentioned drawbacks.
Disclosure of Invention
The application aims to provide a liquid cooling plate processing technology and brazing flux coating equipment.
According to an aspect of the present application, there is provided a liquid cooling plate processing process comprising the steps of:
s1: stamping the first substrate to enable the surface of the first substrate to be downwards recessed to form a flow passage area, wherein welding areas are arranged outside the flow passage area;
s2: fixing the first substrate in the coating equipment;
s3: covering the first substrate with a coating plate, and arranging a plurality of coating holes on the coating plate corresponding to the welding areas;
s4: uniformly brushing brazing flux on the coated plate;
s5: covering the second substrate on the first substrate, and placing the second substrate into a brazing furnace for welding and fixing;
s6: and (5) carrying out quality inspection and packaging on the welded and molded liquid cooling plate.
Preferably, in step S1, the first substrate is first subjected to feeding inspection, then stretched and die-cut to form a runner plate with runners, and then the molded first substrate is cleaned and dried.
Preferably, in step S3, the first substrate is fixed on the coating platform of the coating apparatus by a fixing mechanism, and in step S4, the flux is applied into and attached to the welding area of the first substrate through the coating hole.
Preferably, the coating plate is provided with a soldering flux coating area corresponding to the welding area, the coating area is formed by distributing a plurality of coating holes along the welding area, and the soldering flux is uniformly printed on the first substrate by moving a scraper on the coating plate.
Preferably, in step S5, the second substrate is a flat plate, the second substrate also needs to be punched to obtain a desired shape, after punching, cleaning and drying are performed, and then a pre-riveting process is performed, the liquid inlet joint into which the liquid enters and the liquid outlet joint from which the liquid exits are positioned on the second substrate in advance by riveting, and the second substrate is covered on the first substrate, so that the brazing flux coated on the welding area contacts with the second substrate, and is pushed into the brazing furnace to be welded by the limiting bracket, and at this time, the liquid inlet joint and the liquid outlet joint vertically extend upwards from the second substrate.
Preferably, in step S6, the quality detection performed on the liquid cooling plate includes air tightness detection, appearance detection and strength detection.
Preferably, the coating holes are waist-shaped holes, the number of the waist-shaped holes is D, the width of the welding area of the first substrate is Z, the width of the waist-shaped holes corresponding to the welding area is W, W is more than 1/2Z, and D is more than or equal to 200 and more than or equal to 100.
Preferably, when the liquid cooling plate is welded, the temperature of the brazing furnace is kept at 580-630 ℃, and the duration of the welding process is more than 45 minutes.
According to another aspect of the present application, there is provided a flux coating apparatus for a liquid cooling plate processing process, including a coating platform for placing a first substrate, a coating plate mounting portion for mounting a coating plate, the coating plate mounting portion being located above the coating platform, and a doctor blade for coating a flux, the doctor blade being disposed above the coating plate.
Preferably, the device further comprises a driving plate surface which is perpendicular to the coating platform, wherein a driving plate is arranged on the driving plate surface, the driving plate can vertically move up and down along the driving plate surface, the mounting part of the coating plate is fixed with the driving plate and can vertically move up and down under the driving of the driving plate, so that the coating plate is driven to vertically move, a transverse moving mechanism for mounting a scraper is arranged on the driving plate, and the scraper can horizontally move along the direction perpendicular to the length direction of the scraper under the driving of the transverse moving mechanism so as to perform soldering flux printing on the first substrate and can simultaneously move up and down along with the driving plate.
Compared with the prior art, the liquid cooling plate processing technology and the soldering flux coating equipment provided by the application have the following beneficial effects:
by adopting the technical scheme, the liquid cooling plate processing technology has the advantages of simple process flow, high production efficiency, strict working procedure, simple and convenient operation and wide applicability, the brazing flux coating mode adopts a method of coating plate printing, the brazing flux coating area is designed on the coating plate aiming at the welding area, the brazing flux is precisely printed at the appointed position, the non-welding area is prevented from being coated with the brazing flux, the internal cleanliness of the cold plate after welding is greatly improved, the brazing flux consumption is also greatly saved, the product quality is ensured while the production cost is reduced, and the heat dissipation efficiency and the service life of the liquid cooling plate are also improved.
Drawings
The application is described in further detail below with reference to the attached drawings and detailed description:
FIG. 1 is a flow chart of a liquid cooling plate processing process of the present application;
FIG. 2 is a detailed flow chart of the liquid cooling plate processing process of the present application;
FIG. 3 is a perspective view of the coating plate of the present application;
FIG. 4 is a plan view of the coating plate of the present application;
FIG. 5 is an enlarged view at A of FIG. 4;
FIG. 6 is a plan view of a first substrate of the present application;
FIG. 7 is a state diagram of the first substrate of the present application after being coated with flux;
FIG. 8 is a perspective view of a liquid cooling plate according to the present application;
fig. 9 is a perspective view of the flux applying apparatus of the present application.
The device comprises a first substrate, a runner, a second substrate, a coating plate, a coating hole, a liquid inlet joint, a liquid outlet joint, a brazing flux coating device, a coating platform, a driving plate surface, a driving plate, a scraper and a coating plate mounting part, and a traversing mechanism.
Detailed Description
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
For the sake of simplicity of the drawing, the parts relevant to the present application are shown only schematically in the figures, which do not represent the actual structure thereof as a product. Additionally, in order to simplify the drawing for ease of understanding, components having the same structure or function in some of the drawings are shown schematically with only one of them, or only one of them is labeled. Herein, "a" means not only "only this one" but also "more than one" case.
It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
In this context, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, unless explicitly stated or limited otherwise; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
In addition, in the description of the present application, the terms "first," "second," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following description will explain the specific embodiments of the present application with reference to the accompanying drawings. It is evident that the drawings in the following description are only examples of the application, from which other drawings and other embodiments can be obtained by a person skilled in the art without inventive effort.
Referring to fig. 1, the application discloses a liquid cooling plate processing technology, wherein a liquid cooling plate is formed by welding a first substrate 1 and a second substrate 2, and comprises the following steps:
s1: stamping the first substrate 1 to enable the surface of the first substrate to be downwards recessed to form a flow passage area, wherein the other parts of the flow passage area are welding areas;
s2: fixing the first substrate 1 in the coating apparatus 6;
s3: covering the coating plate 3 on the first substrate 1, and arranging a plurality of coating holes 31 on the coating plate 3 corresponding to the welding areas;
s4: uniformly brushing brazing flux on the coated plate 3;
s5: covering a second substrate 2 on the first substrate 1, and placing the first substrate into a brazing furnace for welding and fixing;
s6: and (5) carrying out quality inspection and packaging on the welded and molded liquid cooling plate.
Referring to fig. 2, in step S1, first, the first substrate 1 and the second substrate 2 are subjected to material selection inspection, and a plate made of aluminum alloy is sent to a detection device to be subjected to material feeding inspection, so as to detect whether the appearance, mechanical properties and dimensions of the plate are defective. And then, conveying the substrate 1 into punching equipment for stretching and punching, and forming a concave runner 11 for circulating liquid on the first substrate 1, so that the processed and molded first substrate 1 becomes a runner plate, and the area where the runner 11 is located is a runner area. The molded first substrate 1 is put into a cleaning apparatus to be cleaned and dried.
Referring to fig. 3 and 6, in step S2, the dried first substrate 1 is fixed to the application stage 61 in the application apparatus 6 by an adjustable positioning mechanism. In step S3, the coating apparatus 6 is provided with the coating plate 3, and the coating plate 3 is provided with the coating region. The region other than the flow path on the first substrate 1 is designed as a welding region, and the coating region is provided corresponding to the welding region, and is composed of a plurality of coating holes 31 distributed along the welding region.
Referring to fig. 4, 5 and 6, the coating holes 31 are waist-shaped holes, the number of the waist-shaped holes is D, the width of the welding area of the first substrate 1 is Z, the width of the waist-shaped hole corresponding to the welding area is W, wherein Z > W >1/2Z, and 200 is greater than or equal to D is greater than or equal to 100. In other embodiments, the coating holes 31 are not limited to waist holes, and may be round holes, square holes, or coating regions not provided in a hole shape, but a continuous linear structure provided along the welding region. According to the actual situation, the sizes of the waist-shaped holes at the corresponding positions are correspondingly different because the sizes of the welding areas of each part are different, so that the widths of the welding areas and the waist-shaped holes which correspond to each other vertically in the position relation meet the relation of Z > W > 1/2Z.
Referring to fig. 7, in step S3, the coating plate 3 is coated on the first substrate 1 by the coating apparatus 6, and the coating region on the coating plate 3 and the soldering region of the first substrate 1 correspond to each other up and down, that is, the coating hole 31 and the soldering region correspond to each other. In step S4, the flux is applied to the soldering region of the first substrate 1 through the application holes 31 by moving the application flux back and forth laterally on the application plate 3 by the doctor blade 64, forming a flux layer distributed along the soldering region. The coated plate 3 is then removed, the first substrate 1 is removed and pushed to a drying line for drying.
In other embodiments, the flux may be applied to the soldering region of the first substrate 1 by spraying, rolling, or the like, without being limited to the application printing using the doctor blade 64. Meanwhile, the coating amount of the brazing flux of the refrigeration plate can be reasonably controlled by adjusting the size of the coating area of the coating plate 3 and the number of the coating holes 31 mesh, so that the brazing flux is prevented from being coated on a non-welding area, the accurate and efficient coating is achieved, the internal cleanliness of the welded refrigeration plate is greatly improved, and the brazing flux amount is also greatly saved.
Referring to fig. 8, in step S5, the second substrate 2 is also punched to obtain the desired shape before being covered with the first substrate 1, and after punching, the second substrate is cleaned, dried, and then subjected to a pre-riveting process. The pre-riveting joint procedure is to pre-position the liquid inlet joint 4 for liquid to enter and the liquid outlet joint 5 for discharging on the second substrate 2 in a riveting mode, wherein a welding tab or a welding ring is arranged between the joint and the second substrate 2.
The second substrate 2 with the liquid inlet joint 4 and the liquid outlet joint 5 is covered on the first substrate 1 so that the flux coated on the welding area is in contact with the second substrate 2, and at this time, the liquid inlet joint 4 and the liquid outlet joint 5 extend vertically upward from the second substrate 2. The liquid cooling plate formed by covering the second substrate 2 on the first substrate 1 is put into a limit bracket, and is assembled before welding. The limiting bracket can play a role in pressing and limiting the covered first substrate 1 and the covered second substrate 2, and then the first substrate and the second substrate are pushed into a brazing furnace through the limiting bracket to be brazed. The liquid inlet joint 4 and the liquid outlet joint 5 are welded and fixed together with the flat plate at the same time when the first substrate 1 and the second substrate 2 are welded. When the liquid cooling plate is welded, the temperature of the brazing furnace is kept at 580-630 ℃, and the duration of the welding process is at least 45 minutes.
In step S6, the brazing furnace has forced cooling and natural cooling functions, and according to different practical situations, a proper cooling mode is selected, and after the welded liquid cooling plate is cooled, quality detection of the welded liquid cooling plate comprises air tightness detection, appearance detection, strength detection and the like, and defective products are removed.
Compared with the traditional brazing flux coating mode, the brazing flux coating plate 3 is used for printing, the brazing flux coating area is designed by the brazing flux coating plate 3, the brazing flux coating plate 3 and the liquid cooling plate are positioned through the positioning structure, and brazing flux is printed on the welding area through the coating area in an effective mode of brushing, rolling, pressing and the like. Therefore, the application amount of the brazing flux can be reasonably controlled by adjusting the size of the application area on the application plate 3 and the mesh number and arrangement mode of the application holes 31, and the non-welding area is prevented from being also coated with the brazing flux, so that the internal cleanliness of the welded liquid cooling plate is greatly improved, and the welding area is also coated with the minimum brazing flux to achieve the optimal welding effect, and the brazing flux amount is greatly saved. The method replaces the traditional brazing flux spraying process, is changed into printing, has simpler process, does not have excessive complex process, reduces the brazing flux coating area, can effectively control the brazing flux consumption, and saves the production cost.
Referring to fig. 9, the present application also discloses a flux coating apparatus for processing a liquid cooling plate, comprising a coating platform 61 for placing a first substrate 1, a coating plate mounting portion 65 for mounting a coating plate 3, and a doctor blade 64 for coating flux, wherein the coating plate mounting portion 65 is located above the coating platform 61, and the doctor blade 64 is located above the coating plate 3. The soldering flux coating equipment also comprises a driving plate surface 62 which is arranged vertically to the coating platform 61, wherein a driving plate 63 is arranged on the driving plate surface 62, the driving plate 63 can vertically move up and down along the driving plate surface 62, a coating plate mounting part 65 is fixed with the driving plate 63 and can vertically move up and down under the driving of the driving plate 63, so that the coating plate 3 is driven to vertically move, a transverse moving mechanism 66 for mounting a scraper 64 is arranged on the driving plate 63, and the scraper 64 can horizontally move along the direction vertical to the length direction of the scraper 64 under the driving of the transverse moving mechanism 66 so as to perform soldering flux printing on the first substrate 1 and can simultaneously vertically move along with the driving plate 63.
It will be apparent to those skilled in the art that various modifications and variations can be made to the above-described exemplary embodiments of the present application without departing from the spirit and scope of the application. Therefore, it is intended that the present application cover the modifications and variations of this application provided they come within the scope of the appended claims and their equivalents.

Claims (10)

1. The liquid cooling plate processing technology is characterized by comprising the following steps of:
s1: stamping the first substrate to enable the surface of the first substrate to be downwards recessed to form a flow passage area, wherein welding areas are arranged outside the flow passage area;
s2: fixing the first substrate in the coating equipment;
s3: covering the first substrate with a coating plate, and arranging a plurality of coating holes on the coating plate corresponding to the welding areas;
s4: uniformly brushing brazing flux on the coated plate;
s5: covering the second substrate on the first substrate, and placing the second substrate into a brazing furnace for welding and fixing;
s6: and (5) carrying out quality inspection and packaging on the welded and molded liquid cooling plate.
2. The liquid cooling plate processing process according to claim 1, wherein in step S1, the first substrate is first subjected to a feed inspection, then stretched and die-cut to form a runner plate having runners, and then the molded first substrate is cleaned and dried.
3. The liquid cooling plate processing process according to claim 1, wherein in step S3, the first substrate is fixed to a coating platform of a coating apparatus by a fixing mechanism, and in step S4, a flux is coated into and attached to a welding area of the first substrate through the coating hole.
4. The liquid cooling plate processing process according to claim 3, wherein a flux coating area is provided on the coating plate corresponding to the welding area, the coating area is formed by a plurality of coating holes distributed along the welding area, and the flux is uniformly printed on the first substrate by moving a doctor blade on the coating plate.
5. The liquid cooling plate processing technology as claimed in claim 1, wherein in the step S5, the second substrate is a flat plate, the second substrate is also required to be punched to obtain a required shape, after punching, cleaning and drying are performed, then a pre-riveting joint procedure is performed, a liquid inlet joint for liquid to enter and a liquid outlet joint for liquid to be discharged are preformed on the second substrate in a riveting manner, the second substrate is covered on the first substrate, so that the brazing flux coated on the welding area contacts the second substrate, and the brazing flux is pushed into a brazing furnace through a limiting bracket to be welded, and at this time, the liquid inlet joint and the liquid outlet joint vertically extend upwards from the second substrate.
6. The liquid cooling plate processing process according to claim 1, wherein in step S6, quality inspection of the liquid cooling plate includes air tightness inspection, appearance inspection, and strength inspection.
7. The liquid cooling plate processing technology according to claim 4, wherein the coating holes are waist-shaped holes, the number of the waist-shaped holes is D, the width of the welding area of the first substrate is Z, the width of the waist-shaped holes corresponding to the welding area is W, W is more than 1/2Z, and 200 is more than or equal to D is more than or equal to 100.
8. The liquid cooling plate processing technology according to claim 5, wherein the temperature of the brazing furnace is kept at 580-630 ℃ and the duration of the welding process is more than 45 minutes when the liquid cooling plate is welded.
9. A flux coating apparatus dedicated to the liquid cooling plate processing process according to claims 1 to 8, comprising a coating platform for placing a first substrate, a coating plate mounting portion for mounting a coating plate, and a doctor blade for coating flux, the coating plate mounting portion being located above the coating platform, the doctor blade being located above the coating plate.
10. The flux coating apparatus of claim 9, further comprising a driving plate surface perpendicular to the coating platform, wherein the driving plate surface is provided with a driving plate, the driving plate can vertically move up and down along the driving plate surface, the mounting part of the coating plate is fixed with the driving plate and can vertically move up and down under the driving of the driving plate, thereby driving the coating plate to vertically move, the driving plate is provided with a traversing mechanism for mounting a doctor blade, and the doctor blade can horizontally move along the direction perpendicular to the length direction of the doctor blade under the driving of the traversing mechanism, so as to perform flux printing on the first substrate and can simultaneously move up and down along with the driving plate.
CN202310966439.9A 2023-08-03 2023-08-03 Liquid cooling plate processing technology and brazing flux coating equipment Pending CN116673704A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310966439.9A CN116673704A (en) 2023-08-03 2023-08-03 Liquid cooling plate processing technology and brazing flux coating equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310966439.9A CN116673704A (en) 2023-08-03 2023-08-03 Liquid cooling plate processing technology and brazing flux coating equipment

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CN216827015U (en) * 2021-12-28 2022-06-28 苏州汇川联合动力***有限公司 Auxiliary tool and printing equipment
CN114230376A (en) * 2022-01-11 2022-03-25 成都成维精密机械制造有限公司 Composite process, tool block and device for uniformly coating composite brazing filler metal on ceramic surface
CN114393271A (en) * 2022-02-15 2022-04-26 惠州市则成技术有限公司 Distribution tool capable of flexibly allocating SMT soldering paste amount
CN114531785A (en) * 2022-02-21 2022-05-24 深圳市华星光电半导体显示技术有限公司 Tin printing steel mesh and method for printing tin paste
CN218631940U (en) * 2022-10-18 2023-03-14 合肥同智机电控制技术有限公司 MOS pipe tin cream coating frock

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Application publication date: 20230901