What is a puller set? | DNT Auto Tools FAQ

Pullers are used to remove parts from a shaft. The puller legs are placed around the part, while the puller screw is tightened against the shaft, then tightened further to apply enough pressure for the puller to remove the part from the shaft. DNT Tools is one popular puller manufacturer. 

As a specialist metalworking tools supplier,We offer standard and general purpose puller sets, cone puller sets, hammer puller sets, wide puller sets, and bearing separator sets, as well as many other types of DNT puller sets. And Offer OEM Service to Brand tools

Pullers and separators help remove heavy parts or tightly fitted components in autobody shops. Gear pullers remove automotive gears and bearings. Jaw pullers have two or three arms with hooks that grip parts to secure and pull them off of a spindle.

What is a puller set? | DNT Auto Tools FAQ: What is a puller set?source of bearing puller,China manufacturer DNT supply Puller set with high quality

what's Drop Forging? DNT Tools' use Forging Techniques | DNT Auto Tools FAQ

Drop forging is a kind of forging process different from press forging, upset forging or other forging processes. In drop forging, the billet is deformed into desired shapes with the help of forging dies. Types of drop forging are open-die drop forging and closed-die drop forging. The shape of the die is the main differences between open die drop forging and closed die drop forging like the names. Closed die drop forging does fully encloses the workpiece, while open die forging does not.

Closed Die Drop Forging

Closed die drop forging, or closed die forging, is a forging way that presses heated round metal bar into the shape we need under the pressure of the dies. It will ensure the accuracy of dimensions and little machining allowance, no structure limit, high production efficiency. General steps of closed die drop forging are: mould developing-raw material cutting-heating material-forging-trimming cutting-heat treatment-shot blasting-machining-surface treatment-package. Materials that applied in drop forging process can be stainless steel, alloy steel, carbon steel, copper and other forged materials.

Open Die Drop Forging

Open-die drop forging is also known as smith forging. In open-die forging, a hammer strikes and deforms the billet, which is placed on a stationary anvil. Open-die forging gets its name from the fact that the dies do not enclose the workpiece, allowing it to flow except where contacted by the dies. The operator therefore needs to orient and position the workpiece to get the final shape. The dies are usually flat in shape, but some have a specially shaped surface for specialized operations. For example, a die may have a round, concave, or convex surface or be a tool to form holes or be a cut-off tool. Open-die forgings can be worked into shapes which include discs, hubs, blocks, shafts (including step shafts or with flanges), sleeves, cylinders, flats, hexes, rounds, plate, and some custom shapes. Open-die forging lends itself to short runs and is appropriate for art smithing and custom work. In some cases, open-die forging may be employed to rough-shape ingots to prepare them for subsequent operations. Open-die forging may also orient the grain to increase strength in the required direction.

what's Drop Forging? DNT Tools' use Forging Techniques | DNT Auto Tools FAQ: what's Drop Forging? DNT Tools' use Forging Techniques

Casting Process's Advantages/Disadvantages/Applications | DNT Auto Tools FAQ

Applications Of Casting Process

Transport: automobile, aerospace, railways and shipping

Heavy equipment: construction, farming and mining

Machine tools: machining, casting, plastics moulding, forging, extrusion and forming

Plant machinery: chemical, petroleum, paper, sugar, textile, steel and thermal plants

Defense: vehicles, artillery, munitions, storage and supporting equipment

Electrical machines: motors, generators, pumps and compressors

Municipal castings: pipes, joints, valves and fittings

Household: appliances, kitchen and gardening equipment, furniture and fittings

Art objects: sculptures, idols, furniture, lamp stands and decorative items.

Advantages Of Casting Process

Casting has the following advantages over other manufacturing processes.

● It can create any complex structure economically.

● The size of object doesn’t matter for casting.

● The casting objects have high compressive strength.

● All structure made by casting has wide range of properties.

● This can create an accurate object.

● All material can be cast.

● It creates isotropic structure.

● It is cheapest among all manufacturing processes.

● Composite component can be easily made by casting.

Disadvantages Of Casting Process

The disadvantages of the Casting Process are as follows.

● Dimensional accuracy: Because of shrinkage in the casting, the dimensional accuracy might be at risk. So, the designers must take care of providing the allowance to the product (Pattern) before pouring the molten metal.

● Low strength: Due to high porosity compared to a machined part.

● Post-processing: It requires Secondary machining operations in order to improve the surface finish.

● Lower Melting Point: Generally limited to metals of the lower melting point.

Not suitable for low-volume production.

Casting Process's Advantages/Disadvantages/Applications | DNT Auto Tools FAQ: Casting Process's Advantages/Disadvantages/Applications

What Is The Casting Process? | DNT Auto Tools FAQ

What Is The Casting Process?

Casting processes involve the use of molten material, usually metal. This molten material is then poured into a mould cavity that takes the form of the finished part. The molten material then cools, with heat generally being extracted via the mould, until it solidifies into the desired shape.

Metal casting comes in two main categories: processes with reusable molds and processes with expendable molds. In both processes, the caster melts the metal material in a crucible, pours it into a mold, then removes the mold material or the casting once the metal has cooled and solidified.

The basic metal casting process involves creating a pattern and a mold, then pouring molten metal into the mold. You will then extract the solid metal casting and finish your piece. This process is customizable for different types of metal casting, along with shapes, sizes, and more.

Step 1: Create The Pattern

Before you make your mold, you must create a pattern to determine the mold’s shape. The pattern can be a 3-dimensional model of your final cast. It may be shaped in wax, sand, plastic, or even wood.

Some casters use molds made of plaster or silicone, which are materials that could not withstand a molten metal cast but allow the caster to mass create wax multiples to use in expendable mold casting.

When you are shaping your pattern, make sure your account for any anticipated shrinkage when the metal cools. Patterns may also be gated with sprues to allow the molten metal to flow into the mold.

Step 2: Make The Mold

After you have created a pattern, it is time to make your mold. As we mentioned above, you may choose to make a reusable mold, which is typically made from metal, or a single-use mold, which may be made from sand, plaster, or ceramic shell.

Each of these methods for making molds are optimized for different casting metals and various levels of pattern complexity. If you are working with a wax or plastic pattern, you can burn out the pattern inside of a kiln.

Step 3: Choose The Metallic Alloy

All metal castings are produced from either ferrous or non-ferrous alloys. Alloys are a mixture of elements that provide the best mechanical properties for the final cast’s use. Ferrous alloys include steel, malleable iron, and gray iron.

Non-ferrous alloys that are most commonly used in casting are aluminum, bronze, and copper. If you are working with precious metals in a jewelry studio, you may work with silver, copper, gold, and platinum.

Step 4: Melt The Alloy

Melting processes vary between alloys because each alloy will have a different melting temperature. Essentially, melting consists of placing the solid alloy in a crucible and heating it over an open flame or inside of a furnace.

Step 5: Pour Into The Mold

Pour the molten metal into the mold cavity. If it is a small casting, you may simply pour from the crucible where the metal was heated directly into the mold. A larger casting may require a small team to support heating the metal inside of a furnace, and transferring the metal into a larger crucible or ladle before being poured into the mold.

Make sure to follow all recommended safety guidance when pouring molten metal. Make sure you wear protective clothing, including natural fiber clothing, long pants and sleeves, insulated gloves, and safety goggles.

Work in a well-ventilated space to avoid any risks from dangerous fumes. Make sure you have a chemical fire extinguisher nearby and keep your walkway between the furnace and the mold clear. Allow the mold to solidify before moving on to the next step.

Step 6: Remove The Casting From The Mold.

When the metal has cooled and solidified, you can remove it from the mold. If you cast into a single-use mold, you can break away the mold from the casting. If you used a plaster investment, you will want to quench the plaster in water after the metal has solidified. The water will help break away the mold. For reusable molds, you may use ejector pins to extract your casting.

Step 7: Finishing

File and polish your solid metal cast! This may involve cleaning your cast metal object, like scrubbing away excess mold material in water, breaking off the casting gates with clippers for small objects, or even an angle grinder for large pieces.

What Is The Casting Process? | DNT Auto Tools FAQ: What Is The Casting Process?

What is mechanical puller? | DNT Auto Tools FAQ

In the routine or corrective maintenance of rotating systems, a fast, reliable and non-destructive approach need to beadopted. Use of hammerand drift pins to removebearings, gears, pulleys and other components stuck in shafts can damage the shaft or the component.Furthermore, such method of removing stuck components can be unsafe and is a form of occupational hazard. While occupational hazards have been a concern for long , harmful habits have reportedly led to injuries and other work related health issues in the automobile industry . A puller,also called an extractor, can sufficiently be used to safely remove components stuck in a shaft.Development of puller for removal of components from shaft started almost a century ago .

 There are two types of pullers namely;the hydraulic and the mechanical types.The hydraulic pullers work base on hydraulic principle. They are easier and quicker to use, also they are suitably used when very largeextraction forces are required.Hydraulic pullersare complicated and ostly to acquire by local technologyin developing countries. 

The mechanical puller is a simple device in that it has few and easy to construct components, namely; the screw, a bolt/head, linkage arm (jaw) and a handle. The jaws are either two or three. Currently, there exist different jaw designs .The mechanical pullers work base on the principle of power screw,that is, they change angular motion into linear motion totransmit power.

What is mechanical puller?Source of mechanical puller with high quality from DNT Tools | DNT Auto Tools FAQ: What is mechanical puller?Source of mechanical puller with high quality from DNT Tools,