How To Make Wrench?

What is Spanner ?

A wrench is a tool - the English call it a spanner - that is usually operated by hand, and is made for tightening or loosening bolts, nuts or anything that needs to turn. Solymon Merrick patented the first wrench in 1835.


The physics of a wrench are that the tool works as lever. There are notches at the mouth for gripping. The wrench is pulled at a right angle to the axes of the lever-action and the bolt or nut. Some wrenches have mouths that can be tightened to better fit various objects that need turning.

A wrench or spanner is a tool used to provide a mechanical advantage in applying torque to turn bolts, nuts or other items designed to interface with a wrench.

In American English, wrench is the standard term, while spanner refers to a specialized wrench with a series of pins or tabs around the circumference. (These pins or tabs fit into the holes or notches cut into the object to be turned.) The most common shapes are called open-end wrench and box-end wrench.
In British English, spanner is the standard term. The most common shapes are called open-ended spanner and ring spanner.
Higher quality wrenches are typically made from chromium-vanadium alloy tool steels and are often drop-forged. They are frequently chrome-plated to resist corrosion.
Hinged tools, such as pliers or tongs, are not generally considered wrenches.

Parts of Spanner…


Process to make the spanner :

Raw Materials
Shearing & Heating of Cropped Piece
Hot Forging & Trimming Process
The Grinding Process
Broaching Operation to Dimensional Accuracy
Over Drive Broach
Hardening & tempering process
The Plating Treatment

First step

Raw Materials
The production of spanner begins with raw material:chromium-vanadium alloy tool steels and are often drop-forged. They are frequently chrome-plated to resist corrosion. The choice of raw material depends on economic factors such as cost and availability, and the technical capabilities of the plant's melting furnaces, as we'll explain shortly.

Second step

Shearing & Heating of Cropped Piece

Using highly efficient eccentric presses the blank is cut according to the size of double open end spanner to be forged. Then the blank is heated upto the exact preselected temperature (1000-1200° C) in the pusher furnace before forging it to its form

Third step

Hot Forging & Trimming Process 
The red hot cropped piece is pulled out of the furnace with the help of tongs and kept under lower and upper dies to give it a shape under tons of pressure from the blows of the drop hammer. Then the trimming process is carried out to remove the surplus steel.

Four step

The Grinding Process

Using different types of grinding belts of special grain structure the burr on the outer surface of the head & shaft is removed using grinding process.

Five step

Broaching Operation to Dimensional Accuracy
This is an important operation to produce the exact size of the jaws. The broaching tool is pressed through the forged jaw opening to produce the exact size in case of open end wrenches and the broaching tool is passed through the ring surface to give it profile in case of Combination & ring Spanner
 
 
Six step

Over Drive Broach
With our constant R & D we have developed the new profile in the ring wrench head. In this design the force is applied to the flanks of the bolt heads & not to the corners. This type is also suitable even for 50% worn rounded fasteners.

Seventh step

Hardening & tempering process
Hardening & tempering is done in an automatic shaker hearth furnace in which both hardening & tempering temperature are controlled. By this process the structure of steel is made finer. The hardness achieved in this way guarantees the high value in the tools use, the great torque can be transferred, and service life of our tools.

Eight step

Final step
The Plating Treatment
Different kinds of surface protection is given to wrenches by the process of plating treatment. Here the tool is first degreased carefully, then nickel plated and finally chromium plated.
At ambika we are proud to produce various following finishes.