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How to distinguish between heat-treated pieces and artifacts without heat treatment?

Die casting mould

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If workers accidentally put a work piece without heat treatment together with a batch of debugging goods that after heat treatment, how to distinguish them now? Don't look cut workpiece, that will damage the product. Heat treatment process of 30CR had through normalizing, quenching and tempering, and raw piece is the die casting piece without heat treatment. Both of them had through the blasting processing, their color cannot be distinguished any more, also, their hardness are between 35 and 45, it is indistinguishable relying on hardness. If hardness and oxidation color didn't work, it is suggested that to distinguish by percussion. Metallographic structures of castingng, quenching and tempering artifacts are different and there are differences among their internal frictions. Through tapping, they are likely to be distinguished.

Posted on Jan 03, 2017

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Posted on Jan 02, 2017

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How many Categories of Shot Blasting Machines?


There are five categories of China shot blasting machines: road surface shot blasting machines, tumble shot blasting machines, hook type shot blasting machines, table shot blasting machines, internal steel tube shot blasting machines.
Here's a detailed introduction of the characteristics of various kinds of shot blasting machines.
1. Road surface shot blasting machines
Shot blasting machines for road surface are mainly used to solve the defects of the concrete surface treatment. It can remove laitance and impurities of concrete surfaces at one time, and can have the coarsen treatment of the concrete surface, which brings the uniform roughness of surface. This greatly improves the adhesive strength of waterproof layers and concrete base layers, so that the waterproof layer and the bridge deck can be combined better and the crack of the concrete can be fully exposed at the same time, which is a prevention solution. Automatic reverse blowing dust collectors can clean each filter element through air blew back by the compressor at regular intervals. Then, it will be cleaned through the airflow of the assorted cleaner inside the machine. The abrasive material and the cleaned impurity will be recycled respectively, and the abrasive material can be reused. Each shot blasting machine is equipped with a dust collector so that the construction can be dust-free and pollution-free, which can both improve efficiency and protect the environment.
Advantages:
Shot blasting machines for road surface can be used in the surface treatment of the waterproof base of concrete bridges, the surface coarsen treatment of the pavement overlay, cleaning of the sign line of road, bridge and the steel box girder, improvements of anti-slide performance. Also, it can greatly improve the roughness and texture depth. The uniform roughness will not destroy the original surface structure and integrity. The entire process of construction is dust-free and impurities are completely recycled.
2. Tumble shot blasting machines
Tumble shot blasting machines are is applied for surface cleaning and strengthening of large and medium sized production parts. When the parts to be cleaned is less than 200kg, this machine can be used alone or used as a supporting facility. Applied ranges: die castings, precision castings, the cleaning of precision forgings, mass finishing, removing heat treatment parts, castings, surface oxidation of castings, and intensification of spring, rust removal and pretreatment of fasteners.
Advantages:
Tumble shot blasting machines can be applied for various productions such as large and medium-sized workpieces, rust cleaning or shot blasting of the surface. The workpieces to be cleaned usually are the main parts and heat treatment parts with weight of less than 150kg. The machine can be used alone or used as a supporting facility. It is suitable for the cleaning, rust removal, scale removal and surface strengthening of small castings, forgings, stamping parts, gears, springs and other parts, especially of fragile parts.
3. Hook type shot blasting machines
As the standard mode of shot blasting machines, the maximum carrying capacity of the hook type shot blasting machine is 10000 kg. A hook type shot blasting machine has very high efficiency and good flexibility. It is an ideal cleaning and strengthening facility, which is mainly used for surface treatment of various media, large castings, forgings, weldments, and heat treatment parts, including fragile and irregularly shaped workpieces.
Advantages:
With the advantages of large shot blasting, high cleaning efficiency, large space, compact structures and no special requirements on the shape and structure of the cleaning piece, a hook shot blasting machine can serve several purposes. It is applied for sand cleaning, rust removal, scale removal and surface reinforcement of the castings and forgings less than 15kg of various industries. This machine is equipped with a special set of dust device, so the place of installation is free from the ventilation pipe workshop and it has good sanitary conditions.
4. Table shot blasting machines
The table shot blasting machine is mainly used for volume surface cleaning of small and medium sized workpieces. It is suitable for the engine connecting rod, gear, diaphragm spring , etc. It is widely used in the casting and automobile manufacturing industries. It has several characteristics of high production efficiency, good sealing performance, compact structure, convenient loading and unloading parts, high technical content, etc.
Advantages:
The table shot blasting machine is mainly used for the removal of surfaces' sand, rust, oxide skin, dirt, etc., which can restore the surface color of the metal workpiece, eliminate the internal stress, improve the anti-fatigue performance, increase the film adhesion, and ultimately achieve the goal of improving the surface and internal quality.
5. Internal and External steel tube shot blasting machines
An internal and external steel tube shot blasting machine is a new type of net wall shot blast cleaning machine combined with the shot blasting technology to clean the inner wall of the cylinder.
It uses compressed air as its power and utilizes the kinetic energy of accelerating projectile to shoot the cylinder wall. When the cylinder located in the gun room, the gun will automatically insert into the respective bottle and the spray gun will move up and down in the cavity. Then it will complete the full range of cleaning. Inside and outside wall shot blasting machine is the selected type of the cylinder industry.
Advantages:
An internal and external steel tube shot blasting machine is mainly used for architecture, bridge and other industries. It is used for rust removal of the large I-shaped steel, H beam and surface. It has advantages of large shot blasting, high efficiency, rapid blade replacement, overall replacement performance and easy maintenance. Shot Blasting Machine Manufacturer China Shot Blast Machine

Aug 04, 2017 | Heavy Machinery

1 Answer

Impacts of Vacuum Die Casting Technology on Aluminum Alloy Die Castings?


Aluminum alloy die casting is the casting process that injecting the high temperature molten aluminum alloy liquid into die cavity with high pressure and high speed for moulding. Features of this casting method are product precise forming and high production efficiency. However, the conventional die casting process is defective. Because the gas in the mold cavity cannot be eliminated effectively, the gas in the mold cavity cannot be eliminated effectively, and the inner parts of the casting can be left to form the defects of the pores, to make the mechanical property of the casting poor. In order to solve this problem, people use the method of vaccum pumping, that is, the gas in the cavity of the die casting can form a certain vacuum or negative pressure state, thereby reducing the inner hole defect of the casting.

Dec 21, 2016 | Cars & Trucks

1 Answer

If a pond takes 3.5 chemical ounces to treat 1,000 gallons, then how many ounces to treat 570 gallons?


Take 1000 into 3.5 (3.5 divided by 1000) to get how much chemical is needed to treat one gallon. Then multiply that value by 570 to get what is needed for 570 gallons.

3.5 / 1000 = 0.0035 * 570 = 1.995 ounces to treat 570 gallons

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? can enlarged prostate be treated without tur /


Click the link and you get lots o answers. Pick some and decide what you think is the truth.

http://lmgtfy.com/?q=can+enlarged+prostate+be+treated+without+tur

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1 Answer

Key copy


No problem here just cut out your own blank on a piece of mild steel then using a dremmel to make the groves then local locksmith or shop that has a machine then copy ,afterwards heat treat the key ,now i know iam goig to be amolished here about my heat treatment process but its easy to do .This older vehicle has no chip to worry about so a few hours work and its done

Mar 21, 2012 | 1984 Dodge Ram 50

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I have a 18month Electrolux 8kg front loader which has mould on the bottom part of the rubber seal. I have always kept the door open after every wash but the mould has set in. I have tried wiping it with...


You will find that wiping it dry, then painting it with thick household bleach and leaving it overnight will have an excellent effect on the staining. The rubber will tolerate the bleach without any problem. If one night doesn't quite cut through the mould, treat again the following night.

Just remember to wash the bleach away thoroughly, so that it doesn't affect any garments in the next wash!

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1 Answer

I want to make a bullet for a gun i don't know how to do that


You have to obtain the correct projectile mould for the calibre of your weapon, and a small block of lead form your gunsstore. Heat the lead with a gas burner until molten and pour into the mould. Allow to cool, open the mould and clean up the projectile with fine file to remove casting edges. Now you can use it in you re-loader.

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`use a lap cooler and under clock ur gpu when not in use

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