Unlock instant, AI-driven research and patent intelligence for your innovation.

Laminar flow well

A technology of flow wells and shunt elements, which is used in auxiliary devices, tin feeding devices, metal processing equipment, etc.

Inactive Publication Date: 2009-10-14
CELESTICA INT INC
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, studies have shown that while in many cases copper via knees exposed to leaded solder can withstand approximately 60-90 seconds of contact time before the via knees are completely melted, test results from the same tester show that the use of SAC405 has no Copper hole wall knees of lead alloys can only withstand about 30 seconds of contact time

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Laminar flow well
  • Laminar flow well
  • Laminar flow well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] 【0029】see figure 1 , The solder fountain machine is represented by the number 10 as a whole. The solder fountain 10 has a base 12 supporting a protective casing 14 . The protective shell 14 surrounds a solder pot 16 containing some molten solder 18 . A flow well 20 extends upwardly from the solder oven 16 . A pump 22 within the solder furnace 16 draws molten solder 18 through a flow well 20 , producing a solder peak 24 . The fountain 10 also includes a control box 26 for controlling the operation of the solder fountain 10, such as the flow rate of the pump. The solder peak 24 overflows and returns to the solder furnace 16 via an inverted frustum 28 with a central hole 29 overlying the solder furnace 16 .

[0030] 【0030】if figure 2 As best shown in , PCB 30 has a series of copper PTH hole walls 32 aligned on board 30 and corresponding to a series of pins 34 extending from connector 36 . A cross-sectional view of an exemplary hole wall 32 without pins 34 inserted i...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

It has been observed that turbulent solder flow, particularly at the opening of a conventional flow well, correlates to a greater degree of Cu dissolution of the PTH barrels of a PCB, especially those that are aligned with the opening. A more laminar solder flow is created to more evenly distribute the solder flow and thus reduce the rate of Cu dissolution near the flow well opening, particularly during a PTH rework process. In one aspect, a flow well for a soldering machine is provided comprising a flow distribution element, wherein solder flowing into the flow well is distributed by the flow distribution element to provide a more laminar flow.

Description

technical field [0001] [0001] The following relates to soldering, and has particular application to solder fountain wells used in the rework process of Pin-Through-Hole (PTH) mounts. Background technique [0002] [0002] Many electronic components, such as connectors, have a series of pins for connecting such components to the PCB through a through-hole mounting hole wall (PTH Barrel) provided on a printed circuit board (Printed Circuit Board, PCB) . The PTH hole wall is generally in the shape of an "I-shaped wheel", which includes an annular sleeve with a middle hole and an upper ring portion and a lower ring portion mounted to the sleeve. The middle hole on the sleeve penetrates through the thickness of the PCB. The upper ring portion and the lower ring portion overlie a portion of the PCB adjacent to the upper surface and the lower surface of the sleeve. The interface between the annulus and the sleeve of a PTH bore wall is often referred to as the Barrel Knee. These PT...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B23K3/08B23K3/06
CPCB23K3/0638
Inventor 克雷格·J·汉密尔顿
Owner CELESTICA INT INC