Advantages and Disadvantages of Powder Metallurgy Gears

Whether by weight or by quantity, the proportion of powder metallurgy (PM) and metal injection molding (MIM) gears is much larger than that of PM parts in other fields. Gears, ratchets and cams are all suitable for powder metallurgy, because, in terms of powder metallurgy and MIM gears, besides low cost and high production efficiency, there are also the following advantages.

(1) The dimensional accuracy of powder metallurgy gears produced in large quantities is uniform, especially when carbide die is used.

(2) Because of the porosity in the material structure, it is helpful for the gear to run smoothly and self-lubricate.

(3) Powder metallurgical gears with blind angle can be made, which can eliminate undercutting and retracting grooves when cutting gears. When making this kind of gear by powder metallurgy, special support is needed at the blind end.

(4) Gear can be combined with other shape parts, such as cam, ratchet, other gears, etc., and integrated production can be realized by powder metallurgy process.

(5) Bevel gears, bevel gears with equal diameter, helical gears and other special tooth-shaped gears can be made.

(6) Standard involute gears can be made, which is simpler and cheaper than other methods.

(7) The ratchet wheel, like the gear, is easily manufactured by powder metallurgy and MIM. Root cutting should be avoided, and large radius should be allowed at the top and root of teeth.

Powder metallurgy and metal injection molding have the characteristics of excellent surface roughness, uniform performance among parts and self-lubrication, which is especially advantageous for making gears and cams. Sintered cams with self-lubricating properties often have more durable surfaces than grinders. Powder metallurgy gears can be formed at one time, which not only saves cost, but also improves productivity.

Harbermetal is a professional manufacturer and solution provider of metal powder injection molding process (MIM) and PM process. We provide our customers with high volume structural, functional and appearance parts of various materials with high precision, complex shapes, good performance and exquisite appearance, and we have the ability to develop ceramic and titanium alloy materials to meet the needs of different types of customers. The company mainly provides all kinds of precise and complex hardware structure parts and components to worldwide enterprises in the fields of 3C consumer electronics, new energy, drones, medical devices, automobiles, aerospace, civil consumer goods …… etc.

Powder metallurgy has lots of advantages, such as material saving, energy saving, high efficiency, suitable for mass production, good size and shape repetition, low noise and low wear when gears are running etc., so it has been widely used. The main defects are impacting resistance and poor impact function. Therefore, it is very important to enhance its strength.

A. Strength characteristics of powder metallurgy gears

1. The expansion coefficient of materials and the accuracy of dies mostly depend on the accuracy of powder metallurgical gears. Generally, the domestic die for gear within 50 diameters is between 8-9 grades, while the imported die is between 7-8 grades. If it is helical gear, it can also be a higher grade. The greatest advantage of powder metallurgy gear is that it can be produced in large quantities and has good consistency.

2. For ordinary FN0205 powder metallurgy gear, it can carry torque up to 14NM, warm-pressed parts can reach 20NM, and warm-pressed FD0405 can reach 25NM. Therefore, in the case of professional powder metallurgy design, gears weight can still be reduced by 30-40%.

B. Increasing the strength of powder metallurgical gears

1. For high strength powder metallurgical gears, they should have high density and follow the process of “pressing-preheating-reheating-heat treatment”.

2. Lower carbon content can ensure that the product has high surface hardness and wear resistance in heat treatment. Low carbon will make the product have excellent impact resistance.

3. Adding 2%-3% Ni and 2% Cu into the material can obviously improve material impact strength after sintering.

4. Compared with carburizing and quenching, carbonitriding products have excellent wear resistance. Lower carbonitriding temperature guarantees parts core strength and reduces the quenching deformation.

Financing And Refinancing Through Commercial Loans

Business establishments all over the world need a proper channel of cash flow so that they can maintain regularity in growth and diversification. As it is rightly said, finance is fundamental to the growth of an old business and vital for any businessman to put the business planning take into action.

Loans for business purposes are available by pledging commercial properties or by borrowing without supplying any security. In both cases, there are lots of differences like the loan eligibility, the rate of interest offered by the lender, the loan tenure and repayment conditions. A successful business project is very often an organized one. You have to plan it well and supply with right dose of capitalization. If over capitalization of business can result in lower earning per share, the under capitalization can also have its negative effect in the form of unnecessarily high stock prices that are unrealistic.

A successful businessman always takes care of under investments and over investments. More complex financial aspects are taken care of by the financial experts and brilliant business minds. But, arranging for the daily cash flow requirement is relatively low level task that is handed over to the delegates having authority to deal with day to day functioning of the company. Business loans are one of the easiest means to ensure that any shortage in funds is met effectively at lower rates and in a competitive environment.

If you are seeking funds for a new venture, it will be perfect to take care of every possible aspect so that no problem arises later on. The root level problem that people face is the lack of knowledge when they go out and start searching for a commercial loan at low rate [http://www.loans-park.co.uk/commercial-loans.html]. The second obstacle comes when finance is made available to you. It relates to how to generate profits out of it so that interest payments can be justified. Both these things can be answered by a well-planned and well-implemented course of action. There should be a clear-cut plan of what you are going to do with money and how you are going to generate the profits. This should be your biggest and legitimate concern if you are to reach the top of the business world.

Market trends and in-depth knowledge about the business is necessary before take a plunge into it. If you are not confident, it is not advisable to take commercial business loans and risk your capital; business is surely not a fun expedition. On the other hand, there are people who lose valuable opportunities because they think that the cost of capital is too high. The market rates are bound to fluctuate in the market. There is an opportunity to refinance commercial loans if the interest rates fall drastically in the time to come. So, do not waste too much of your precious time and proceed with your plans if you are confident of the business project you are handling.

The author is a business writer specializing in finance and credit products and has written authoritative articles on the finance industry. He has done his masters in Business Administration and is currently assisting ask4loan.co.uk as a finance specialist.

The Importance of Workplace Safety Posters

Workplace safety posters play an important role in effective safety communications, safety precautions and safety warnings to workers. It is one kind of safety communication. Their applications in chemical industries are very common where various potential hazards present.

Safety regulations and legal require the use of workplace safety posters. Generally, these posters have to be placed in workplaces where hazards exist. They warn workers about specific hazards that accompany their jobs and naturally appear in such workplaces.

Government or Department of Labor in each country has may already established the required workplace safety posters. And in some cases, the government has prepared these printed posters that can be used directly.

When the safety regulation requires such posters application, there will be certain penalties or fines for violations. In general, the employers will be fined when workers get injured due to lack of safety posters as required by the regulations.

Some employers may think that these posters for workplace are only devoted for the workers or employees. But, actually they are wrong. These posters are purposed to protect both workers and employers.

Employers would not responsible for any incident happen in the workplace if they have applied the required posters. As an example is the usage of eye goggle. When the employers have displayed the poster of eye goggle according to the regulation, then when worker or employee gets injured by chemical splash without using eye goggle, the employer does not responsible. The reverse condition is also applied.

However, before displaying any safety posters in the workplaces, always bear in mind that these posters should be relevant, clear and to the point. Use only common words and communicative images or pictures to get workers’ attention.