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Video: Continuous Flow Impregnation System Walk Around

Godfrey & Wing’s Continuous Flow Impregnation (CFi) system seals porosity in a short cycle time with minimal labor. In this video, John Halladay (aka Johnny Impreg) will show you some of his favorite features:

1. Compact design

2. Part traceability 

3. Integrates with production

Video Transcript

Hello, everybody. Welcome to another edition of Casting Call with Johnny Impreg. I’m your host, Johnny Impreg, and again this month, we’re going to be unveiling a new piece of equipment. It seems like we just did it last month, but our equipment people have been really busy.

Favorite FeaturesThis is an automated system that’s going to go to an engine plant in Mexico, and it’s got a couple of unique features I’d like to share with you. Number one, it’s super compact, and it integrates directly in with the manufacturing facility. The blocks are fed in with an Automated Guided Vehicle (AGV). They go through the process completely automatically. They’re scanned for traceability, and they go through an outbound cooling tunnel, or they go back to, with the AGV, back to a leak test. So, super small, compact, totally integrated, complete traceability, the Godfrey & Wing CFi.

Let’s TalkHope you enjoyed this video. If you have any questions, please leave them in the comments below, and watch for another upcoming edition with some more machines that we’ll be unveiling. Thanks for your time, and as always, bye for now.

State of the Die Casting Industry

In the latest issue of Die Casting Engineer, NADCA President Stephen Udvardy reports on the overall North American die casting health. This piece discusses a variety of manufacturing topics ranging from political factors, macroeconomics, and surveying current business challenges. 

Below are three takeaways in regards to the automotive industry.

Manufacturing Capacity Increase

The report states that overall, consumer sentiment is high (Figure 1). The high consumer sentiment has had a positive impact on U.S. manufacturing outlook. This has lead manufacturers to increase capacity. U.S. manufacturing capacity increased to 77.5% in the third quarter of 2019, a two-point increase from 2017 (Figure 1).

Figure 1: Consumer sentiment from 2009 through the third quarter of 2019.

Light Vehicle Sales

“The current forecast for light vehicle sales in 2019 is 16.9 million units (Figure 2). Stephen explained, ” 16.9 million units represent strong light vehicle sales, defying the predictions in 2017 that sales above or near 17.0 million could not be sustained.”

Figure 2: Monthly light vehicle sales from November 2018 to November 2019.

Electric Vehicle Sales

The report cites Statista that 1.2% of 2018 U.S. auto sales were of plug-in electric vehicles. Sales of plug-in electric cars are forecasted to grow to 7.6% of total U.S. auto sales by 2026.

In Conclusion

This report highlights a variety of economic and political barometers. Overall, the data indicates that the U.S. manufacturing outlook is healthy and encouraging. 

Video: Can Vacuum Impregnation Seal Cracks?

In some die casting applications, components must also be pressure-tight to hold pressurized fluid or gases. Companies use the vacuum impregnation process to meet these requirements by sealing the internal leak paths without impacting any other features of the casting. A commonly asked question is in addition to leak paths, can vacuum impregnation seal die casting cracks? This video answers this question with easy to follow visuals.

Video Transcript 

Hola, y buen dia todos. Welcome to another edition of “Casting Call with Johnny Impreg.” I’m your host Johnny Impreg and in this episode we’re gonna get into the question of “Can Vacuum Impregnation Seal Cracks?” I’d like to rephrase that a little bit and say “Should Vacuum Impregnation Be Used to Seal Cracks?” I’ll start out with the answer is, “No, you should never use vacuum impregnation to seal a crack.”

Let’s Get Into the Science

Now let’s get into the science a little bit, I’ll explain why I say that. Now, everybody’s familiar with porosity, and that’s kind of formed during the solidification process, is either shrink porosity or gas porosity. And when that forms, when the casting freezes, that’s static. It’s never going to move so that when we fill the casting porosity with sealant, that’s never going to open up again. That leak path is sealed and the sealant will survive as long as the casting. Now, if you take a look at a crack, on the other hand, a crack forms post-solidification, typically in the injection. Sometimes in handling after the casting is ejected. But, the crack is not static and can move.

Impregnating Cracks vs. Impregnating Porosity

And what will happen is sealant will actually seal it and it may pass leak tests. But then when you go to assemble it and torque it down for assembly, or worse yet, when it gets out in the field, the crack can propagate and open up again, and then that will open up the leak path. So it will fail later on.

And cracks can be a real problem with castings because it can be difficult to detect. You can actually have a crack that’s so slight it will pass leak test to be an impregnation candidate. You impregnate it and it will seal for a passing leak test, then it gets out in the field and it leaks. Oftentimes folks will jump to the conclusion that impregnation failed, but on further investigation you’ll find that there’s a crack. And some of the programs that we do, leak testing and vacuum impregnation, if it leaks in an area that we know is prone to cracking, the casting will get scrapped and not even impregnated.

So, I hope this information is helpful. If you have any questions, please look me up on LinkedIn or hit me up on WhatsApp and be happy to help out more. Take care and bye for now.

Correcting Three Vacuum Impregnation Myths

In some die casting applications, components must also be pressure-tight to hold pressurized fluid or gases. Companies use vacuum impregnation to meet these requirements by sealing the internal leak paths caused by interconnected porosity.

Misconceptions and lack of information about the vacuum impregnation process can hinder its implementation, which may increase unforeseen costs and negatively impact part quality. This piece demystifies vacuum impregnation by correcting three common myths.

Myth: Vacuum Impregnation is a CoatingFact: The process occurs subsurface, with no residual sealant remaining on the part’s surfaces, machine features, blind holes, and taps. Only the sealant drawn into the leak path by the force of the vacuum and pressure remains in the casting.

Myth: Vacuum Impregnation Causes Dimensional Changes to CastingsFact: Vacuum impregnation does not change the casting’s dimensions, thus allowing engineers the freedom to design and make parts to the net shapes. Since the vacuum impregnation process occurs subsurface, an engineer does not need to incorporate dimensional allowance.

Myth: Vacuum Impregnation is a Cork or PlugFact: Vacuum impregnation seals porosity deep within the leak path; it is not a cork or plug. In the case of visible or open porosity, low viscosity sealants will most likely be washed out of pits or holes. Thus, a casting with surface porosity or blemishes before the process will exhibit the same surface porosity and blemishes after the process. However, the leak path below the part’s surface is fully sealed.

In Summary A clear understanding of how vacuum impregnation works can help companies maximize their production results. As the preferred method to prevent fluids or gases from leaking under pressure, the vacuum impregnation process seals casting porosity that forms during manufacturing. When done properly, the casting will function so that fluids or gasses will flow only where needed while physical characteristics, simply stated, will not be different in any manner. Vacuum impregnation helps manufacturers decrease the rate of scrapped parts, increase productivity, and ultimately increase their profitability.

Case Study: Enabling Continuous Flow Manufacturing

Productivity and quality are keys to the success of any continuous flow production philosophy. However, vacuum impregnation systems have remained antiquated, which causes production and quality issues in modern manufacturing environments. Hence their absence from most continuous flow production plans.Such is the case of a vertically integrated automotive OEM. This company had an outdated vacuum impregnation system that did not meet their continuous flow strategy. The division that operates the vacuum impregnation system pours the metal, machines, and assembles components to produce finished engines.

The Challenge

At the launch of a new engine block line, the company realized that its current vacuum impregnation system could not reliably process the new engine blocks. The OEM realized that the following challenges needed answered:

1. Sealing Rate-The system was Dry Vacuum (DV) process only that resulted in below-average sealing rates.
2. Floor space– The current automated system was enormous. It did not fit the desired floor space or integrate with production. As a result, the size was debilitating to their production flow.
3. Maintenance– The system required continuous support. Maintenance areas were difficult to access. Spare parts were expensive and needed the company to keep a high inventory.

The Solution

The OEM’s leaders realized that the current vacuum impregnation system would need to be replaced with a modern impregnation system.

Based upon these roadblocks, Godfrey & Wing recommended its Continuous Flow Impregnation (CFi) system. The system would be customized to answer the customer’s challenges.

To improve the sealing rate, the CFi uses the patented Dry Vacuum and Pressure (DVP) process, which yields a higher seal rate than the DV process. The CFi with the DVP process incorporates a fast, deep vacuum to evacuate the air from the porosity. Then after moving sealant to the part, the system applies high pressure to allow the sealant to penetrate deep in the casting walls.

The OEM specified precisely where to place the system on the manufacturing floor. Knowing this, the Godfrey & Wing engineering team designed the layout to accommodate the floor space and production integration.

The system was designed with a 7-axis robot for parts handling, and conveyors integrated with machining and leak test operations. The robotic arm forms the interface between the impregnation system and the processing line while using the least amount of space. After impregnation, the castings are fed by the robot directly to leak testing via a cooling conveyor belt. The automation enables continuous production in a modular, compact space.

The internal components were positioned to enable ease of maintenance without interrupting production. The maintenance team is now able to service principal components through the rear panel doors, rather than accessing the system through the safety fence. Sanitary connectors are used that can be maintained by hand without the need for specialty tools. Each module has a line rate disconnect so that maintenance does not need to power down the entire system for service.

The Results

The CFi was installed, operators and maintenance were trained, and the system was running production in two months. Since then, the CFi is addressing all the company’s challenges.

1. Increased Sealing Rate– The CFi has increased recovery of the castings by 15%. Scrap from porosity has been virtually eradicated.
2. Conserve Floor Space– The system layout cut required floor space by over 50%.
3. Reduced Maintenance Cost– The purchase of the CFi has reduced maintenance costs by 65%. 

In Summary

As OEMs search for ways to improve continuous flow manufacturing, it is necessary for a paradigm shift. This OEM found value in doing so by investing in a lean and modern vacuum impregnation system. The CFi plays an integral production role by increasing casting recovery while reducing maintenance

Can Vacuum Impregnation Seal Cracks?

In some die casting applications, components must also be pressure-tight to hold pressurized fluid or gases. Companies use vacuum impregnation to meet these requirements by sealing the internal leak paths without impacting any other features of the casting. A commonly asked question is in addition to leak paths, can vacuum impregnation seal cracks?

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Explore Cleveland During The Die Casting Congress & Tabletop Show

We look forward to seeing you while you visit Cleveland during NADCA’s Die Casting Congress & Tabletop.  We’re home to a number of distinguished attractions and award-winning eateries. If you are looking for things to do in your free time during the show, below is a list of some of our favorites.

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Case Study: Improving Overall Equipment Effectiveness with Vacuum Impregnation

As manufacturing equipment ages, the Overall Equipment Effectiveness (OEE) decreases. A company that fails to invest in equipment, will not be able to meet demand or produce a quality product, thus potentially losing its competitive edge. Companies who want to succeed in this landscape are identifying equipment investment opportunities to keep production moving and while producing a quality product.

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Video: HVLV Walk Around

The HVLV vacuum impregnation system allows OEMs, contract manufacturers, die casters and foundries to have the benefits of vacuum impregnation in a simple, easy to use machine. In this video, John Halladay (aka Johnny Impreg) will show you some of his favorite features on how the system efficiently and effectively seals porosity while eliminating the costs and risk of outsourcing.

Video Transcript

Hey, Johnny Impreg here. Based on the response we got from my walk around of our CFi, I’ve been asked to do the same kind of video for our HVLV, it’s our High Value Low Volume semi-automated impregnation system.

Favorite Features

Here’s some of my favorite features of the HVLV. Number one, it’s a super small, compact footprint. It’s about 96 square feet, so you can integrate it right into your manufacturing, put it right in with leak test. Second of all, it’s got a super easy man-machine interface with light curtains to protect the operator at all times. 

There’s three modules. You got your vacuum and sealant recovery system, then you’ve got your wash and rinse, and your cure. And to move between modules, all you do is take the basket out, insert it, and start it with a flick of a switch. The system’s PLC control being semi-automated and with the tack time of 240 seconds, you’ll get about 15 jobs per hour. 

Let’s Talk

I hope this information was helpful. If you have any questions, please leave questions or comments in the comments section below, or you can hit me up on WhatsApp or LinkedIn.

Thanks a lot for watching. Bye for now. 

Video: When Should I Impregnate a Casting

The goal of a foundry is to produce high quality die castings that meet or exceed the customer’s specifications at a competitive cost.  In some die casting cases, those specifications require that the part must hold pressurized fluid or gasses. Companies use vacuum impregnation when the part must hold fluids or gasses under pressure. A common question asked about vacuum impregnation is “When Should I Impregnate a Casting?” This video addresses this question by answering if vacuum impregnation should be done before or after machining and finishing. 

Video Transcript

Hey, everyone. Welcome to “Casting Call” with Johnny Impreg. This is a premiere episode of a video blog series where we hope to answer all your compelling questions of everything impregnation. We’re going to start with the question I think I hear most often from folks is, “When should I impregnate a casting?”

Spoiler Alert!

Now, spoiler alert, I’m going to give you the answer now in case you’re short on time. But you want to do the impregnation after machining and prior to any kind of finishing like plating or painting. 

Types of Porosity

Now, here’s why. Let’s consider the three different types of porosity you see in a raw casting—blind porosity, through porosity, wall to wall, and fully enclosed. If you impregnate a casting in this condition, you’ll get sealant in the blind. You’ll get it here, but you won’t get any sealant in this area. That becomes important when you do the machining, because when you machined from here, you’re going to have a leak path.

Now, if you do the impregnation after machining, you’ll still fill this and now you’ll fill this leak path as well. The reason you want to do it prior to finishing is you want to fill up all the porosity before you do the plating or painting. Otherwise, you could end up with out gassing or other blemishes that really don’t look so nice.

Real World Example

Let’s look at a real-world example on a cylinder block. Now, in this region here, we had a case where there was blind porosity going from here into the casting. It didn’t cause a problem until this machining cut was made. We have some other areas where we had enclosed porosity that was connected through two different machining passes. So, this is a real-world example of why you should do impregnation after machining. 

So, I hope this little tutorial helped you. If you have any questions, please feel free to leave comments below and hit me up on WhatsApp or LinkedIn.