Broach tool wikipedia

Roughing Teeth. These are the cutting edges which remove larger amount of stocks during cutting. Larger amount removal generates poor quality of surface finish but makes the operation faster. Finishing Teeth. These are cutting edges removing smaller stocks of material. These are used for final finishing of the surfaces and their accurate sizing. Rear Pilot and Follower Rest. This is a supporting device to the broach when it is likely to complete its operation of broaching.

It is the width of flank face of the broach normally it is kept slightly inclined to give relief angle to the flank face of broach. It is the distance between two corresponding points on two successive teeth of a broach. Normally pitch of finishing teeth of a broach is kept comparatively smaller than the rough cutting teeth.

Height of the Teeth. Height of the roughing and finishing teeth gradually increases from the shank to the finishing teeth. This increment is called the cut per tooth, it depends on the material being machined. Normally the cut per tooth is taken from 0. A broach is normally made in one piece and it is called a solid broach. Different types of the broaches are described below. Progressive Cut Broaches. These broaches have cutting edges, a part of which are of the same height along the broach but have different widths.

In progressive cut broaching, metal is removed in thick layers by each tooth from only part of the work surface. The last tooth of a progressive cut broach remove a very thin layer over the entire profile of the work surface as in ordinary cut broaching.

Rotor Cut Broaching. Rotor cut broaches are used for removing large amount of material in holes in forgings or castings where a primary cutting operation is not desired.

Their teeth are staggered around the periphery at different sections so as to shear the work and allow chip clearance. This is recommended for making square holes from a round cost one. Burnishing Broaches. Burnishing broaches are used for making glazed and finished surface on a steel workpiece.

These are used for finish the hole too. Length The length of a broach tool or string of tools is determined by the brozching of stock to be removed, and limited by the machine stroke, bending moments in a push broachstiffness, accuracy, and other factors. After World War Ibroaching was used to rifle gun barrels. Broaching machines are relatively simple as they only have to move the broach in a linear motion at a predetermined speed and provide a means for handling the broach automatically.

There are two main types of broaching: Horizontal broaching broahing are designed for pull broaching, surface broaching, continuous broaching, and rotary broaching. If the broach is large enough the costs can be reduced by using a built-up or modular construction.

Straddle broaches use two slab broaches to cut parallel surfaces on opposite sides of a workpiece in one pass. If the tool holder rotates, the broach is pressed against the workpiece, but is driven by the tool holder.

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What is the shape of the feature you would like cut by the broach tool? Send us a part print, existing broach tool print, or the specifications of the shape you would like to cut in your part. Let us know know how the part will be presented to the broaching operation. Will the staring hole be pre-machined, forged, or cast? What material is your part made of? What is the hardness prior to broaching? These parameters directly affect the tool life you can expect from your broach tools.

If we know these pieces of information, we can select the appropriate tool steel grade and coating combination for your application. If you don't have a broaching machine or don't know the specifications, we can still quote a broach for you.

We will quote the broach with an appropriate size and pull force rating to cut your part. We can also quote a machine for you. If you already have a machine, what is the stroke and tonnage rating of the machine? Is it a vertical or horizontal style machine?

If you are thinking of using a different piece of equipment, please provide a brief description. If you've purchased a machine from us, we have your machine information readily available. You can include the serial number of your machine if you would like.

We work closely with tool steel mills and their distributors to control the quality and availability of the steel we use to make broach cutting tools. When quoting tools to you, we select the optimum steel grade for the most value and right tool life for your application.