Category Archive News

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.


5-axis machining is an advanced cutting method that creates some of the highest quality parts. It runs with computer numerical control (CNC) technology. While previously reserved for only the highest-budgeted manufacturers, 5-axis machining has come a long way and is now commonly available to the rest of the manufacturing world.

The 5-axis mills and machines are used heavily in aerospace applications and can cut even the most intricate of patterns. They can also offer efficiency improvements for products that may only need 3-axis machining. However you choose to use it, successful 5-axis machining can have significant benefits for your manufacturing operations.

Repair and treatment of guide rail of gantry milling machine

Repair of guide rail of gantry milling machine: the guide rail of machine tool is mostly made of steel or cast iron. If such guide rail is scratched, it should be repaired, otherwise, it will enlarge the scratch and even affect the use of machine tool. In the long-term use of machine tool guide rail and other conflict pairs, due to the conflict of different levels between the two contact surfaces, the surface of the conflict pairs will wear at different levels, which will affect the machining accuracy and production efficiency of the machine tool when it is important. For the repair of machine tools and other worn parts, metal plates and polymer raw materials are usually used for inlaying or exchanging, which not only requires a large number of accurate processing and manufacturing, but also requires manual scraping and grinding of the processing surface. There are many repair processes and long construction period.

Treatment method: the first polymer 2211f metal repair material in the world is selected to repair the guide rail scratch of the gantry milling machine. It only takes a few hours to complete the repair of the part of the guide rail scratch and put it into use. Practice shows that this method is simple to operate, time saving, good repair quality and low cost. Swindling its special adhesion, outstanding compressive strength, oil resistance and wear-resistant functions can provide a permanent protective layer for the parts. It may be useful to deal with the problems that can not be handled by the traditional maintenance methods for large-scale equipment that can not be disassembled, so that the function of the equipment can be increased, the fitting gap of the parts is improved, and the normal operation of the production can be guaranteed with maximum control, so as to save the customers Save a lot of time and money, for the normal operation of enterprise equipment to provide a long-term excellent guarantee.

Repair Principle: polymer composite raw material is a composite raw material based on polymer, metal or ceramic ultrafine powder, fiber, etc. and under the action of curing agent and curing promoter. All kinds of raw materials interact with each other in function and have synergistic effect, which makes the comprehensive function of composite raw materials better than that of raw materials. It has strong adhesive force, mechanical function and chemical corrosion resistance. Therefore, it is commonly used in the repair of mechanical wear, scratch, pit, crack, leakage, forging sand hole of metal equipment and the chemical corrosion protection and repair of various chemical tanks, reaction tanks and pipelines.

On the operation steps of metal parts processing

On the operation steps of metal parts processing

On the operation steps of metal parts processing

1、 Before entering the work position, all employees shall check whether their clothes meet the work requirements. Do not wear slippers, high heels or clothes that affect safety. Those with long hair should wear safety helmet. Maintain a precise posture at work, and have enough energy to deal with the work. If you find any body discomfort, you should leave the job immediately and report to your boss. When operating, we must gather our thoughts, forbid chatting and cooperate with each other. Operators should not operate in the form of fidgety and tired, so as to avoid accidents and ensure the safety of operation.

2、 Before mechanical work, check whether the movable part is filled with smooth oil, then start up and check whether the clutch and brake are normal, and run the machine tool for 1-3 minutes without air, and it is forbidden to operate when there is any mechanical obstacle.

3、 When changing the die, first turn off the power supply. After the movable part of the punch stops running, start to install and debug the die. After the installation and adjustment is completed, move the flywheel by hand twice for trial punching, and check whether the upper and lower dies are symmetrical and correct, whether the screws are firm, and whether the blank holder is in the correct position.

4、 Only after the rest of the staff leave the mechanical work area and take away the sundries on the workbench can the power supply start the machine.

5、 After the machine is started, one person shall transport materials and operate the machine. The rest of the people shall not press the electric building or step on the foot switch board, nor put their hands into the mechanical working area or hit the moving part of the machine with their hands. When the machine is working, it is forbidden to extend the hand into the working area of sliding block, and it is forbidden to take and place the workpiece by hand. When taking and placing the workpiece in the die, the equipment conforming to the standard must be used. In case of any abnormal sound or mechanical failure, turn off the power switch immediately for inspection.

6、 When leaving work, turn off the power supply, and clean up the molding articles, leftovers and sundries on the position to ensure the working environment is clean and safe. The above operation procedures must be consciously followed. Do not operate in violation of regulations. In case of any obstacle, cooperate with the maintenance staff for inspection. In case of any event, cut off the power supply immediately, and keep the site report to the factory Department for handling. The party concerned shall bear all the consequences of violating the operation procedures

Advantages and disadvantages of CNC machining

Advantages and disadvantages of CNC machining

Advantages and disadvantages of CNC machining

CNC machining has the following advantages:

① The number of tooling is greatly reduced, and complex tooling is not required for parts with complex processing forms. If we want to change the form and size of the parts, we only need to modify the processing program of the parts, which can be used in the development and modification of new products.

② The machining quality is stable, the machining precision is high, and the repeated precision is high, which is suitable for the machining requirements of aircraft.

③ Under the condition of multi type and small batch production, the production efficiency is high, which can reduce the time of production planning, machine tool adjustment and process inspection, and reduce the cutting time due to the use of the best cutting amount.

④ It can be used to process complex surfaces which are difficult to be processed by conventional methods, and even to process some processing parts which cannot be observed. The disadvantage of NC machining is the high cost of machine tools and equipment, which requires high level of maintenance staff.

Technical problems of aluminum processing

There are many reasons for the deformation of aluminum parts, which are related to the material, shape and production conditions. There are mainly the following aspects: deformation caused by internal stress of blank, deformation caused by cutting force and cutting heat, and deformation caused by clamping force.

1、 Technological measures to reduce processing deformation

1 reduce the internal stress of blank

The internal stress of the blank can be partially eliminated by natural or artificial aging and vibration treatment. Pre processing is also an effective process. For the blank of fat head and big ear, because of the large margin, the deformation after processing is also large. If the surplus part of the blank is pre processed and the surplus of each part is reduced, not only the processing deformation of the subsequent process can be reduced, but also the internal stress can be released after pre processing for a period of time.

2. Improve the cutting ability of tools

The material and geometric parameters of cutting tools have an important influence on cutting force and cutting heat. The correct selection of cutting tools is very important to reduce the machining deformation of parts.

(1) Reasonable selection of tool geometry parameters.

① Front angle: under the condition of maintaining the strength of the cutting edge, the front angle should be larger. On the one hand, it can grind out a sharp edge, on the other hand, it can reduce cutting deformation, make chip removal smooth, and then reduce cutting force and cutting temperature. Never use a negative rake tool.

② Back angle: the size of the back angle has a direct impact on the wear of the back cutter face and the quality of the machined surface. The cutting thickness is an important condition to select the back angle. In rough milling, due to the large feed, heavy cutting load and large heat output, it is required that the heat dissipation condition of the cutter is good, so the back angle should be smaller. When finishing milling, it is required to have sharp edge, reduce the friction between the back face and the machining surface, and reduce the elastic deformation. Therefore, the back angle should be larger.

③ Helix angle: in order to make milling stable and reduce milling force, the helix angle should be selected as large as possible.

④ Main deflection angle: properly reducing the main deflection angle can improve the heat dissipation conditions and reduce the average temperature of the processing area.

(2) Improve the tool structure.

① Reduce the number of milling cutter teeth, increase chip space. Because of the large plasticity of aluminum material, the large cutting deformation and the need for large chip space, the bottom radius of chip holding groove should be larger and the number of milling cutter teeth is less.

② Sharpen the teeth. The roughness value of cutting edge should be less than RA = 0.4um. Before using a new knife, it is necessary to use a fine oilstone to slightly grind the front and back of the knife teeth, so as to eliminate the remaining burrs and slight serrations when grinding the knife teeth. In this way, not only cutting heat can be reduced, but also cutting deformation is relatively small.

③ Strictly control the tool wear standard. After tool wear, the surface roughness of workpiece increases, the cutting temperature increases, and the deformation of workpiece increases. Therefore, in addition to the selection of good wear-resistant tool materials, the tool wear standard should not be greater than 0.2mm, otherwise it is easy to generate chip accretion. When cutting, the temperature of workpiece should not exceed 100 ℃ to prevent deformation.

3. Improve the clamping method of workpieces

For thin-walled aluminum parts with poor rigidity, the following clamping methods can be used to reduce deformation:

① For thin-walled bushing parts, if the three jaw self centering chuck or spring chuck is used to clamp from the radial direction, the workpiece will be deformed once it is loosened after machining. At this time, the method of axial end face compression with better rigidity should be used. Locate the inner hole of the part, make a self-made threaded through mandrel, insert it into the inner hole of the part, press the end face with a cover plate and back it with a nut. When machining the outer circle, the clamping deformation can be avoided and the satisfactory machining accuracy can be obtained.

② When machining thin-walled sheet metal, it is better to select vacuum sucker to obtain uniform clamping force, and then to process with a small cutting amount, which can prevent the deformation of the workpiece well.

In addition, the filling method can be used. In order to increase the technological rigidity of thin-walled workpiece, the medium can be filled in the workpiece to reduce the deformation of workpiece during clamping and cutting. For example, fill the workpiece with urea melt containing 3% – 6% potassium nitrate, after processing, immerse the workpiece in water or alcohol, then the filler can be dissolved and poured out.

4 reasonable arrangement of process

In high-speed cutting, because of large machining allowance and intermittent cutting, the milling process often produces vibration, which affects the machining accuracy and surface roughness. Therefore, NC High-speed machining process can be generally divided into: rough machining – semi finish machining – angle cleaning machining – finish machining and other processes. For parts with high precision requirements, sometimes it is necessary to carry out secondary semi finishing, and then finish machining. After rough machining, the parts can be naturally cooled to eliminate the internal stress caused by rough machining and reduce the deformation. The allowance left after rough machining shall be larger than the deformation, generally 1-2mm. During finishing, the machining allowance of the finished surface of the part shall be kept even, generally 0.2-0.5mm is the best, so that the cutter is in a stable state during the machining process, which can greatly reduce the cutting deformation, obtain good surface machining quality, and ensure the accuracy of the product.