Monthly Archive April 25, 2020

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Global Trade Sputters, Leaving Too Much Here, Too Little There

WASHINGTON — Factories are idled. Workers are in lockdown. Goods are piling up at some ports, while elsewhere container ships sail empty. Dairy farmers are dumping their milk, while toilet paper aisles at the grocery store have been picked bare.

The spread of the coronavirus has disrupted global supply chains, leading to shortages and price increases that are cascading from factories to ports to retail stores to consumers. While factories in China have been slowly restarting as the country’s epidemic fades, many manufacturers in India, the United States and Europe are powering down, or running at partial capacity.

These disruptions in global trade could grow more noticeable in the months to come, as consumers hoard products and countries clamp down on exports of medical supplies and even food. Shoppers may see more shortages of unexpected products, including laptops, toilet paper and medicines. Some companies could find themselves lacking raw materials and components, a recipe for further financial trouble.

At the White House on Friday, President Trump said he was allocating at least $16 billion to American farmers, ranchers and agricultural producers to keep the American food supply stable.

Why Can’t America Make Enough Masks or Ventilators?

The president has promoted himself as a champion of American manufacturing, but now he avoids addressing its shortcomings.

Hundreds of companies across the United States are reinventing themselves to make equipment that is desperately needed to treat the coronavirus. That so many American manufacturers are rising to meet this pandemic with little coordination from the federal government reveals a deep altruism in our national character.

It also reveals something else: Our country is unable to meet an immediate need for critical medical supplies and personal protective equipment in the face of a crisis. The absence of adequate domestic production capacity for things like face shields and respirators, coupled with the frailty of on-demand global supply chains and our utter reliance on them — for everything from the ingredients in our medications to parts of breathing machines — has left us dangerously exposed during an international health emergency.

Mohawk Fine Papers and its United Steelworkers employees are shifting to medical gown and mask production. American Giantand other garment manufacturers are scaling up the production of medical-grade masks. Companies from Budweiser to Ford are churning out hand sanitizer and ventilators. These instances of private sector action are inspiring, but they won’t be enough.

Our policymaking is still behind the curve. President Trump is starting to selectively use the Defense Production Act, a law from the Korean War era that allows the president not only to order businesses to prioritize the manufacture of items deemed crucial to national security but also to subsidize them. This is something he should have done many weeks ago, and even still he’s mostly invoking it haphazardly with companies that draw his ire.

That Face Shield Might Have Been Made in a Party Space

Last spring, Manhattan’s meatpacking district was hopping with stylish hotels, rooftop cocktail lounges, luxury boutiques, overpriced brunch spots and nightclubs with velvet ropes.

This spring, a refurbished loft with white-painted brick walls and a chef’s kitchen was supposed to be part of the scene. It would serve as a high-end showroom and co-working space by day and an exclusive event venue by night.

That did not happen.

Instead, the 3,100-square-foot space, on the fourth floor of a building called Little Flatiron because of its resemblance to the 23rd Street landmark, reinvented itself as a factory for personal protective equipment, or P.P.E.

We Need a More Resilient American Economy

Americans are a resilient people. We persevere through difficult circumstances and arrive triumphant on the other side of adversity. It’s in our national DNA.

Once again, Americans are rising to the challenge before us. Medical professionals are meeting the call of duty and tending to our sick at great personal risk. Grocery stores, takeout restaurants and pharmacies remain open as Americans show up for work to give the rest of us access to essential goods. Families are working to overcome the tremendous economic damage they face as a result of the coronavirus.

Though I believe resilience is one of the defining traits of an American, I also believe it’s been absent from our public policy for too long. And this has become devastatingly clear in the current crisis.

Over the past several decades, our nation’s political and economic leaders, Democratic and Republican, made choices about how to structure our society — choosing to prize economic efficiency over resiliency, financial gains over Main Street investment, individual enrichment over the common good.

Tight-Knit Company Towns Reel as Coronavirus Rolls Through

As soon as she heard about a cluster of coronavirus cases at the Tyson pork processing plant on the edge of Columbus Junction, Iowa, Cindy Johnston felt a ripple effect through her small community along the Iowa River.

Ms. Johnston, who manages a Dairy Sweet burgers and ice cream shack, sent home four teenage employees because their parents work at the Tyson plant. Parents of other teenage workers were too afraid of potential infection to let their children report to work at Dairy Sweet. Then, she learned of the death of an employee at the Tyson plant; it was the father of a classmate of her son.

“I’ve lived in this community all my life, and I’ve never seen it so scared,” said Ms. Johnston, who is 52, nearly the same age as the father who died.

Across the country, some big cities on the coasts are starting to experience a leveling off of Covid-19 cases, but a staggering number of small Midwestern towns anchored by meatpacking plants and other factories are finding themselves as new hot spots of the virus.

Frantic for Coronavirus Gear, Americans in Need Turn to China’s Elite

HONG KONG — U.S. hospitals and state officials face desperate shortages of the masks, ventilators and other gear they need to fight the coronavirus. Chinese factories can make the equipment and sell it to them, but huge obstacles stand in the way — and Washington’s stumbles and growing hostility with Beijing aren’t helping.

Now some of China’s elite — and others with big stakes in keeping the U.S.-China relationship alive — are stepping in to help.

An ad hoc network of companies, wealthy individuals, academics and former diplomats has emerged to help the United States get the Chinese-made goods it needs to save patients and protect front-line workers — and, perhaps, help polish China’s dented image along the way. They are trying to navigate snarled supply chains, connect wary buyers and sellers and help overwhelmed local officials in desperate need of equipment.

The group includes people like Jack Ma and Joseph Tsai, the co-founders of Alibaba, the Chinese e-commerce giant; Marc Benioff, a co-founder of Salesforce, who struck a pact with Alibaba last year to sell its services in China; and Yichen Zhang, the chairman of Citic Capital, a major Chinese investment firm affiliated with a state-run conglomerate.

What is the overall level of machining

The so-called machinery industry can be said to be machinery industry only if it is related to machinery processing. This industry is divided into machinery industry in broad sense and machinery industry in narrow sense. At present, China’s machinery industry can be said to be too low. Compared with the west, numerous manual workshops are mainly used for processing materials, and drawings and other industries are foreign. However, in the coastal area, although it is manual workshops, However, most of them have their own numerical control equipment, with high processing efficiency, usually mold based, and hardware.

The automatic lathe can automatically finish the multi process processing of small and medium-sized workpieces according to a certain program, automatically load and unload materials, and repeatedly process a batch of the same workpieces, which is applicable to a large number of large-scale production. Special lathe is a kind of lathe used to process the specific surface of a certain kind of workpiece, such as crankshaft lathe, camshaft lathe, wheel lathe, axle lathe, roller lathe and ingot lathe.

(1) The development is uneven, and the overall product level is low. Although the products of some enterprises have reached or are close to the international advanced level, overall, there is still a big gap between the accuracy of the mold, the roughness of the cavity surface, the production cycle, life and other indicators and the overseas advanced level.

(2) The technology and equipment are backward, and the organization and coordination strength are poor. Although some enterprises have changed their skills in recent years, the technology and equipment level is still relatively advanced, and the equipment level of some foreign-funded enterprises is not lagging behind overseas

How to control the surface roughness of machined parts

In the machining industry of mechanical parts, the surface roughness of workpieces is also called brightness. Generally, the surface roughness of carefully machined parts is relatively high. In the machining process of mechanical parts, how can we control the surface roughness of machined parts? Let’s share it with everyone!

1. Cutting processing amount: it is suggested to reduce the surface processing amount properly in the cutting feed amount.

2. Select the geometric parameters of the tool: from the geometric parameters of the machining tool, it can appropriately reduce the deflection angle of the pair and increase the arc radius of the tool tip, and if necessary, it can grind out the polishing edge. It makes the cutting simple and reduces the surface roughness.

3. Control the vibration of machine tool: start from reducing the conflict between the tool and the workpiece, extruding, sharpening the tool edge, adding cutting fluid, and properly heat treating some workpiece materials with good toughness.

4. Choose the right processing technology: in the process of machining the well-rounded mechanical parts, the processing technology process is also very important. If the process flow is not correct, it may affect the processing quality and production efficiency. A lot of carefully processed parts need the requirement of brightness after finishing.

5. Raw material selection difference: mechanical equipment parts are composed of many different raw material processing. According to the raw material density difference, the selection of cutting tools and machine tools in the process of processing is directly related to the surface roughness.

The above is how to control the machining surface roughness of mechanical hardware parts, hoping to help everyone!

What is the overall level of machining

How to say, the so-called machinery industry, if only the industry related to mechanical processing, can be said to be the machinery industry, which can be divided into the broad sense machinery industry and the narrow sense machinery industry. At present, the machinery industry in China can be said to be too low. Compared with the West, there are many large workshops, usually processing materials, drawings and other things are foreign, but in the coastal area, Although it is a manual workshop, most of them have their own numerical control equipment, with high processing efficiency, usually mold based, and hardware.

The automatic lathe can automatically finish the multi process processing of small and medium-sized workpieces according to a certain program, automatically load and unload materials, and repeatedly process a batch of the same workpieces, which is applicable to a large number of large-scale production. Special lathe is a kind of lathe used to process the specific surface of a certain kind of workpiece, such as crankshaft lathe, camshaft lathe, wheel lathe, axle lathe, roll lathe and ingot lathe.

(1) The development is uneven, and the overall product level is low. Although the products of some enterprises have reached or are close to the international advanced level, overall, there is still a big gap between the accuracy of the mold, the roughness of the cavity surface, the production cycle, life and other indicators and the overseas advanced level.

(2) The technology and equipment are backward, and the organization and coordination strength are poor. Although some enterprises have changed their skills in recent years, the technology and equipment level is still relatively advanced, and the equipment level of some foreign-funded enterprises is not lagging behind overseas.

Factors affecting the dimensional accuracy of CNC machining

、 Preventable factors affecting dimensional accuracy of CNC machining

1. Processing technology

Most of the essential machining deviations are formed by different machining process theories. In order to ensure the basic machining process (such as “first rough and then fine, first surface and then hole, first large surface and then small surface” in milling numerical control machining, or “reduce the number of clamping, although select combined clamp” and other basic machining process details in fixture application), the machining deviation of iron chips to aluminum parts is reduced For the aluminum is very soft, the iron scraps removed are very simple to form processing deviation. For example, in FANUC or Huazhong machining center, although the g83 instruction is used to drill deep holes, the scrap iron may be removed instead of the G73 instruction.

2. Numerical calculation in manual programming and automatic programming

3. Three factors of cutting: cutting speed VC, feed F, cutting depth AP and tool compensation

In this respect, in simple words, under the condition of ensuring the machining quality and tool wear, adjust the parameters to fully develop the tool cutting function, so that the cutting efficiency is the highest and the machining cost is the lowest.

In the CNC lathe, there are some factors such as compensation for tool wear. Because I haven’t touched the lathe for a long time, I dare not talk about it in detail. Please search by myself.

4. Inaccurate tool setting is also a factor to form dimensional deviation. Therefore, although a good edge finder is selected, if the machine tool has an automatic tool setting device, it will be better

2、 Irresistible factors:

1. Cooling deformation of workpiece after processing

This is basically impossible to prevent, although in the processing of attention to the use of coolant, and in place measurement, attention to the workpiece deformation after cooling.

2. Stability of machine tool itself

If it is not a new machine tool or the machine tool has been processed a lot without debugging, the size deviation formed by the machine tool itself will appear. There are several factors to form the deviation of machine tool itself:

Mechanical

a. Loose between servo motor and lead screw

b. Ball screw bearing or nut worn

c. Insufficient smoothness between lead screw and nut

Electrical:

a. Servomotor obstacle

b. There is dirt inside the grating ruler

c. Servo amplifier obstruction

PMC recovery can be carried out for system parameters, so it is omitted

CNC Machining parts

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