Broaching is a process of metal cutting. It is about operation in one pass. The tool is broaches and has several cutting edges. In next presentation will be explain type of tools, procedures of treatment, methods of treatment and others. The machine used for this treatments is broaching machine and the thesis provides a systematic model of vertical broaching machines.

1. Faculty of Engineering
University of Kragujevac
Electro-mechanical broaching machine
Profesor: Student:
Sandra Stefanović Asad Masad

2. 1
Abstract
Broaching is a process of metal cutting. It is about operation in one pass. The tool is broaches and
has several cutting edges. In next presentation will be explain type of tools, procedures of
treatment, methods of treatment and others. The machine used for this treatments is broaching
machine and the thesis provides a systematic model of vertical broaching machines.
Key words: Broaching, broaching tools, broaching machine

3. 2
Table of contents
1. Introduction....................................................................................................................................3
2. Proccessing of broaching.................................................................................................................4
2.1 Types of threading.................................................................................................................... 5
2.2 Cutting sheme .......................................................................................................................... 6
3. Machines and tools in processing of broaching .................................................................................8
4. Modeling elements of electro-mechanical broaching machine ..........................................................11
5. Conclusion ...................................................................................................................................14
6. Literature .....................................................................................................................................15

4. 3
1. Introduction
Broaching operation represents metal processing, where the processing is done in one pass. The
tool is broaches and designed to linearly passes perpendicular to the workpiece in the direction of
the axis of the tool. The relative movement of the tool through the workpiece provides broaching
machines (Broaching). The tool can be pushed (which is less common method of treatment), or
drawn through the workpiece. Broaching can be internal (when the tool handles the inner surface
of the workpiece) or external (when the tool processes the outer surface of the workpiece).
Technology-through processing is explained in the second chapter describes the kinematics-
through processing where we can see the position of the tool in the treatment of internal and
external broaching, broaching types, methods and types of broaching and cutting scheme.
The third chapter describes the machines for broaching of some manufacturers and their main
characteristics, the tools in the processing of broaching and their basic structural elements. Also
the choice of form space between teeth, chip breaker and handles broaches (for internal and
external broaching).
Based on the above characteristics and broaching broaches the fourth chapter was used for
modeling the electro-mechanical parts Broaching, or gear and rack, chuck tools, pole mount and
an electric motor, in the program CATIA V5R21. Before ten or more years with the Faculty of
Mechanical Engineering, professors decided to construct broaching machine, whose made almost
all the elements of the machine and it is not finished yet. Broaching is modeled according to the
already existing elements.

5. 4
2. Proccessing ofbroaching
The processing of broaching characterized by high productivity in terms of high series and mass
production and high productivity of machining processes. Despite the simple kinematics
processing this treatment process is one of the most complex processes of metal processing. The
reasons are in the fact that the processing of broaching usually finishing operation and that
processing is performed at very high values of loads of tools and machines. In this connection, the
entire machining system (tools, machines, compression fittings) should be characterized by high
levels of static and dynamic stability. Due to the high cost of tools, broaching applies only in
standard, high series and mass production (Nedić, 2007).
In most cases, processing is performed by passing the linear movement tools. The workpiece do
not perform support the movement, because support movement actually does not exist, except in
some special cases (helical broaches). Support motion in some way is incorporated in the tool
itself. Processing is carried out by drawing a tool, rarely repression, along the axis of the
workpiece. In Figure 2.1 are presented processing scheme for internal and external broaching with
numbered positions. In position 1 is broaches, position 2 guides, 3. work desk, 4. the workpiece
(Nedić, 2007).
Figure 2.1 Scheme of processing by broaching a) internal, b) external (Nedić, 2007)

6. 5
2.1 Types of threading
There are three types of threading:
 Progressive broaching
 Rotary broaching
 Method of processing stamping
In progressive broaching, broaches have cutting edges, they have the same distance from each
other but they have different widths (http://www.ignou.ac.in/upload/broaching).
Figure 2.2 Scheme of progressive broaching
Rotary broaching is used to remove large amounts of material in the holes that are forged or cast
which is not desirable progressive broaching. The teeth in these broaches are arranged in extent
when turning the cuts filings off a piece and allow filings evacuation. This is recommended for the
production of square or hexagonal openings of round (http://www.ignou.ac.in/upload/broaching).
Workpice
Internal
broaches

7. 6
Figure 2.3 Scheme of rotary broaching
A method of processing stamping is used for making polished and final surface on the metal piece.
This is used for finishing holes. The teeth of this tool are rounded and not cutting, or compress and
rub the surface of the metal (http://www.ignou.ac.in/upload/broaching).
Figure 2.4 Scheme of processing tools for stamping
2.2 Cutting sheme
Cutting scheme to broaching means cutting adopted the order (remove) bonus for the entire
treatment. There are a number of different cutting schemes, which mainly depends on the shape
and dimensions of the profile of the workpiece. It is very important that you make at least a rough
optimization of selection schemes cutting (Tadić, 2015).
Workpiece Rotary broaches
Stampingbroaches

8. 7
This means integrally review and analyze selected scheme and cutting effects achieved in terms
of:
• the necessary traction force of machines
• load broaches (critical tensile stresses at broaches for internal broaching)
• required length broach or number broaches included
• the value of cutting depth per tooth (steps per tooth)
• the number of teeth broaches
• achieving the required geometric accuracy and high surface quality and others.
In Figure 2.5 shows some of the possible schemes of cutting.
Figure 2.5 Cutting scheme to broaching (Tadić, 2015)

9. 8
3. Machines and tools in processing ofbroaching
Vertical broaching for internal broaching (Figure 3.1) are the most common type of machine
constructions for internal broaching. The workpiece (7) is placed on a desk machine (2), and the
tool is in the initial stage of processing, before processing, placed in the back of a leading part of
the machine (1). The tool, leading through the last part leads into the operating position when the
front receiving portion (4) acceptance tool. Thanks to the operating system machine (electric motor
5, the transmission system 6 and the mechanism for converting rotary to linear motion) leading the
front part of the machine receives the necessary movement and traction machines, necessary for
the realization of machining processes. Upon completion of the cutting process (reaching lower
points travel tools), the workpiece is removed from the work table and the tool returns to the
starting position (Tadić, 2015).
Figure 3.1 Scheme of pneumatic vertical Broaching for internal broaching (Tadić, 2015)
Horizontal broaching machine for internal broaching (Figure 3.2) are working on a similar
principle, except that the movement of the tool (2) in the horizontal direction and what is necessary
to ensure an appropriate system for receiving and clamping the workpiece (1). Horizontal
broaching machines provide the possibility of continuous operation stationary tool if the workpiece
placed on the rotary table or conveyor belt (Tadić, 2015).

10. 9
Figure 3.2 Scheme of horizontal broaching machine for internal broaching (Tadić, 2015)
Basic structural elements of broaches defined depending on its purpose. In broaches for internal
threading (cylindrical broaches figure 3.3) basic elements are as follows:
1. handle broaches
2. neck broaches
3. the transition cone
4. the front part of the leading
5. cutting part
6. calibrated part
7. the last leading part
8. the receiving part
Figure 3.3 The basic elements of cylindrical broaches (Tadić, 2015)
Handle broaches used for acceptance by the eternal system broaching machine. The front part of
the leading broaches for guidance tools through pre-treated appropriately opening or profile that
formed the previous broaches (when dealing with a set of broaches). On the cutting part of
broaching tools are formed cutting segments (teeth) that after cutting profile scheme or in the
appropriate sections (progressive scheme) cut a complete supplement for treatment of swiping. On

11. 10
the part of the calibrated tools are calibrated formed teeth. The length of this part of the tool
depends on the number of calibrated teeth and their steps. The last part of the leading tools used
for leading tools already formed by the profile. The receiving part of the tool is used for accepting
tools by the receiving mechanism of the machine. In Figure 3.4 shows some of the possible
constructive solutions of space between the teeth (Tadić, 2015).
Figure 3.4 Some of the possible constructive solutions between the teeth (Tadić, 2015)

12. 11
4. Modeling elements of electro-mechanicalbroaching machine
Main purpose of the broaching machine is obtaining the desired shape of the workpiece by
removing excess material, it must receive adequate energy to be converted into mechanical work.
At a new machine for this purpose almost exclusively used electricity, and the drive is realized by
electric motors, using electricity from the grid converted into mechanical (Zahar, 1997).
Figure 4.1 Three-phase asynchronous motor with short-circuited rotor
For further transfer of rotary motion electro-motors can be used gear group, group transfer belts,
transfer chain groups and others. Or a combination of the group gear and transfer belts, as it is used
in a given broaching. The theme of the work does not require a more detailed study of the driveline
group of gears at broaching, so it will not go further on the subject. Due to the high power required
equipment attached to the three belt (belt) from the powertrain to the movement of the drive (gear
- gear lath) machines, to prevent it’s rapid shooting. In Figure 4.2 shows the transfer model . The
width of the belt is 54 mm, a length of the strap around 1650 mm.
Figure 4.2 gear housing and belt drive

13. 12
The desired movement is linear for broaching. This can be achieved in several ways. For example,
a curve mechanism which is very good but it requires a large construction machine, then the worm
gear which is also very good, or using the gear pair (gear - gear lath) that does not require a complex
structure in Figure 4.3. Vertical broaching machine concerned the benefits of gear and gear-lath.
Gear has a diameter of 43mm and a width of 40 mm with a modulus of 2.6. Gear- lath has a length
of 752 mm, a width of 40 mm and a modulus of teeth is also 2.6. Working stroke is about 700 mm.
Figure 4.3 Timing couple
On the gear-lath is attached to the head for accepting and broaching tools (broaches) Figure 4.4.
Figure 4.4 The board
In the Figure 4.5 are shown reception head and slider.

14. 13
Figure 4.5 Reception head and slider
In the Figure 4.6 are shown vertical electro-mechanical broaching machine.
Figure 4.6 Vertical electro-mechanical broaching machine

15. 14
5. Conclusion
Broaching is one of the machining operations, which is used as a tool broaches. The process of
cutting has the one-movement, rectilinear. This processing is called highly productive because the
production of tools are expensive. Broaching can be for the inner surface, as well as for the outer
surface of the workpiece. Depending on the types of broaching cutting is classified as a progressive
cut, rotary cut and embossing surface.
Broaching machines is primarily divided into horizontal and vertical, indoor and outdoor products,
and also on the type of propulsion, whether they are hydraulic, electrical, or other broaching. They
are characterized by large mass, high traction force, high precision machining and long production
runs. There are various types of metal processing machines by broaching. They may be machines
for broaching hard materials, machines in which the workpiece moves a stationary tool, small size
machines, machines for spiral-through processing, machines where the workpiece is heated,
machines for continuous processing where there is a strip for work pieces, machine which can be
carried out by treatment with two tools simultaneously (Dual ram) etc.
Broaching tool selected based on the required length of threading, the mechanical properties of the
workpiece and geometric accuracy and the required quality of processing. The structural elements
of tools includes front and rear receiving part, the cutting teeth and space between the teeth. Bonfire
filings were no less important. Material of broaches should be higher hardness depending on the
type of workpiece.
The fourth chapter describes what is the primary task machines, approximate geometry and
function of each element. In addition to the existing basic elements are modeled elements (pole
slider and guides) to facilitate the work tools for returning to the starting position, made some
minor modifications to the receiving head to be coaxially with the opening in the mounting bracket.
The board of the toothed pair and the pulley has also been modified, it is possible to easily set the
belt on the pulley..

16. 15
6. References
[1] http://www.ignou.ac.in/upload/broaching (accessed September 19th, 2015)
[2] Nedić.B.(2007), Obrada metala rezanjem,Mašinski fakultetKragujevac
[3] Tadić.T. (2015), Alatiza provlačenje,Fakultetinženjerskihnauka,Kragujevac
[4] Zahar. S.(1997) Mašinealatke,Jugoslovenskodruštvozatribologiju,Kragujevac