U.S. patent application number 12/783809 was filed with the patent office on 2011-11-24 for auto-scraping apparatus.
This patent application is currently assigned to CHENG SHIU UNIVERSITY. Invention is credited to Wei-Hung Guo, Wen-Yuh Jywe, Jeng-Nan Lee, Ying-Cnien Tsai.
Application Number | 20110287699 12/783809 |
Document ID | / |
Family ID | 44972862 |
Filed Date | 2011-11-24 |
United States Patent
Application |
20110287699 |
Kind Code |
A1 |
Tsai; Ying-Cnien ; et
al. |
November 24, 2011 |
AUTO-SCRAPING APPARATUS
Abstract
An auto-scraping apparatus for a work piece of a hard rail has a
driving device, a linking device and a tool device. The driving
device has a connecting frame, a driving motor and a cam. The
driving motor is mounted in the connecting frame. The cam is
mounted on a bottom of the connecting frame and has an abutting
face. The linking device is connecting to the driving device and
has a main frame, an upper connecting arm, a lower connecting arm,
a linking arm and a rotating wheel. The main frame is connected to
the driving motor. The connecting arms are pivotally connected to
the main frame and the linking arm. The rotating wheel is rotatably
mounted on the upper connecting arm and abuts the abutting face of
the cam. The tool device is connected to the linking device and has
a tool carrier and a relieving tool.
Inventors: |
Tsai; Ying-Cnien; (Niaosong
Township, TW) ; Guo; Wei-Hung; (Niaosong Township,
TW) ; Lee; Jeng-Nan; (Niaosong Township, TW) ;
Jywe; Wen-Yuh; (Huwei Chen, TW) |
Assignee: |
CHENG SHIU UNIVERSITY
Kaohsiung County
TW
National Formosa University
Yunlin Hsien
TW
|
Family ID: |
44972862 |
Appl. No.: |
12/783809 |
Filed: |
May 20, 2010 |
Current U.S.
Class: |
451/340 |
Current CPC
Class: |
B23D 79/02 20130101;
B23D 79/04 20130101 |
Class at
Publication: |
451/340 |
International
Class: |
B24B 41/00 20060101
B24B041/00 |
Claims
1. An auto-scraping apparatus comprising: a driving device having a
connecting frame having a top; and a bottom; a driving motor
securely mounted in the connecting frame and having a bottom; and a
driving shaft rotatably connected to the bottom of the driving
motor, extending out of the bottom of the connecting frame and
having a free end; and a cam securely mounted on the bottom of the
connecting frame beside the driving shaft of the driving motor and
having a top side securely mounted on the bottom of the connecting
frame; a bottom side; a width; a middle; two ends; and an abutting
face being wavy and formed on the bottom side of the cam; a linking
device securely connected to the driving device and having a main
frame securely connected to the driving motor and having a top side
securely mounted around the free end of the driving shaft of the
driving motor; and a bottom side; an upper connecting arm pivotally
connected to the main frame near the top side of the main frame and
having a connecting end opposite to the main frame; and a top side;
a lower connecting arm pivotally connected to the main frame near
the bottom side of the main frame under the upper connecting arm
and having a connecting end opposite to the main frame; and a
bottom side; a linking arm pivotally connected to the connecting
ends of the connecting arms to form a four-bar-mechanism with the
main frame; and a rotating wheel rotatably mounted on the top side
of the upper connecting arm near the connecting end and abutting
the abutting face of the cam; and a tool device detachably
connected to the linking device and having a tool carrier securely
mounted on the bottom side of the lower connecting arm; and a
relieving tool securely mounted on the tool carrier.
2. The auto-scraping apparatus as claimed in claim 1, wherein the
connecting frame has a connecting rod formed on and protruding from
the top of the connecting frame to connect to a spindle of a
Computerized Numerical Control machine tool.
3. The auto-scraping apparatus as claimed in claim 2, wherein the
rotating wheel has two holding mounts securely mounted on the top
side of the upper connecting arm to hold the rotating wheel on the
upper connecting arm.
4. The auto-scraping apparatus as claimed in claim 3, wherein the
tool carrier has a mounting surface opposite to the lower
connecting arm; and the relieving tool is securely mounted on the
mounting surface of the tool carrier.
5. The auto-scraping apparatus as claimed in claim 4, wherein the
width of the cam at the middle is wider than the widths of the cam
at the ends.
6. The auto-scraping apparatus as claimed in claim 5, wherein the
cam is semicircular; and the main frame is U-shaped.
7. The auto-scraping apparatus as claimed in claim 1, wherein the
rotating wheel has two holding mounts securely mounted on the top
side of the upper connecting arm to hold the rotating wheel on the
upper connecting arm.
8. The auto-scraping apparatus as claimed in claim 1, wherein the
tool carrier has a mounting surface opposite to the lower
connecting arm; and the relieving tool is securely mounted on the
mounting surface of the tool carrier.
9. The auto-scraping apparatus as claimed in claim 1, wherein the
width of the cam at the middle is wider than the widths of the cam
at the ends.
10. The auto-scraping apparatus as claimed in claim 1, wherein the
cam is semicircular; and the main frame is U-shaped.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to an auto-scraping apparatus
for a work piece, and more particularly to an auto-scraping
apparatus that can be assembled to a Computerized Numerical Control
(CNC) machine tool easily and can rotate to scrape a surface of the
work piece accurately.
[0003] 2. Description of the Prior Arts
[0004] In general, a conventional hard rail for a machine tool
needs to be scraped before assembly, a scraping process is used to
scrape a contacting surface of the conventional hard rail to form
multiple recesses in the contacting surfaces of the conventional
hard rail. The recesses can contain lubricant to lubricate movement
of a moving element on the hard rail, since surface roughness may
affect mobility of the moving element on the conventional hard
rail.
[0005] There are two conventional methods to scrape a work piece:
manual scraping method and semi-automatic manual scraping method.
In the conventional manual scraping method, a relieving tool is
used to scrape recesses into a surface of a work piece. In the
semi-automatic manual scraping method, a semi-automatic scraping
machine used to scrape recesses into a surface of a work piece.
[0006] However, the conventional scraping methods are operated
manually to scrape recesses in the work piece, scraping quality is
dependent on worker experience and is subject to human error. In
addition, the conventional methods are difficult to learn and are
time-consuming. Furthermore, the conventional semi-automatic
scraping machine is heavy and is not easy to operate.
[0007] To overcome the shortcomings, the present invention provides
an auto-scraping apparatus for a work piece to mitigate or obviate
the aforementioned problems.
SUMMARY OF THE INVENTION
[0008] The main objective of the present invention is to provide an
auto-scraping apparatus for a work piece of a hard rail, and more
particularly to auto-scraping apparatus that can be assembled to a
CNC machine tool easily and can rotate to scrape a surface of the
work piece accurately.
[0009] The auto-scraping apparatus for a work piece of a hard rail
in accordance with the present invention has a driving device, a
linking device and a tool device. The driving device has a
connecting frame, a driving motor and a cam. The driving motor is
mounted in the connecting frame. The cam is mounted on a bottom of
the connecting frame and has an abutting face. The linking device
is connected to the driving device and has a main frame, an upper
connecting arm, a lower connecting arm, a linking arm and a
rotating wheel. The main frame is connected to the driving motor.
The connecting arms are pivotally connected to the main frame and
the linking arm. The rotating wheel is rotatably mounted on the
upper connecting arm and abuts the abutting face of the cam. The
tool device is detachably connected to the linking device and has a
tool carrier and a relieving tool.
[0010] Other objectives, advantages and novel features of the
invention will become more apparent from the following detailed
description when taken in conjunction with the accompanying
drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0011] FIG. 1 is a perspective view of an auto-scraping apparatus
in accordance with the present invention;
[0012] FIG. 2 is an exploded perspective view of the auto-scraping
apparatus in
[0013] FIG. 1;
[0014] FIGS. 3 to 5 are operational side views of the auto-scraping
apparatus in
[0015] FIG. 1 scraping a work piece of a hard rail; and
[0016] FIG. 6 is a side view of the auto-scraping apparatus in FIG.
1 mounted on a CNC machine tool.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0017] With reference to FIGS. 1 to 3, an auto-scraping apparatus
for a work piece (40), such as a hard rail, in accordance with the
present invention comprises a driving device (10), a linking device
(20) and a tool device (30).
[0018] With reference to FIG. 6, the driving device (10) may be
mounted on a spindle (51) of a CNC machine tool (50) above a
working table (52) and has a connecting frame (11), a driving motor
(12) and a cam (13).
[0019] The connecting frame (11) is connected to the spindle (51)
of the CNC machine tool (50) and has a top, a bottom and a
connecting rod (111). The connecting rod (111) is mounted on and
protrudes from the top of the connecting frame (11) and is
connected to the spindle (51) of the CNC machine tool (50).
[0020] The driving motor (12) is securely mounted in the connecting
frame (11) and has a bottom and a driving shaft (121). The driving
shaft (121) is rotatably connected to the bottom of the driving
motor (12), extends out of the bottom of the connecting frame (11)
and has a free end.
[0021] The cam (13) may be semicircular, is securely mounted on the
bottom of the connecting frame (11) beside the driving shaft (121)
of the driving motor (12) and has a top side, a bottom side, a
thickness, a middle, two ends and an abutting face (131). The top
side of the cam (13) is securely mounted on the bottom of the
connecting frame (11). The abutting face (131) is wavy and is
formed on the bottom side of the cam (13). The thickness of the cam
(13) at the middle is wider than the thickness of the cam (13) at
the ends.
[0022] The linking device (20) is securely connected to the driving
device (10) and has a main frame (21), an upper connecting arm
(22), a lower connecting arm (23), a linking arm (24) and a
rotating wheel (25).
[0023] The main frame (21) may be U-shaped, is securely connected
to the driving motor (12) and has a top side and a bottom side. The
top side of the main frame (21) is securely mounted around the free
end of the driving shaft (121) of the driving motor (12).
[0024] The upper connecting arm (22) is pivotally connected to the
main frame (21) near the top side and has a connecting end opposite
to the main frame (21) and a top side.
[0025] The lower connecting arm (23) is pivotally connected to the
main frame (21) near the bottom side under the upper connecting arm
(22) and has a connecting end opposite to the main frame (21) and a
bottom side. The linking arm (24) is pivotally connected to the
connecting ends of the connecting arms (22, 23) to form a
four-bar-mechanism with the main frame (21) and the connecting arms
(22,23).
[0026] The rotating wheel (25) is rotatably mounted on the top side
of the upper connecting arm (22) near the connecting end, abuts the
abutting face (131) of the cam (13) and has two holding mounts
(251). The holding mounts (251) are securely mounted on the top
side of the upper connecting arm (22) to hold the rotating wheel
(25) on the upper connecting arm (22).
[0027] The tool device (30) is detachably connected to the linking
device (20) and has a tool carrier (31) and a relieving tool (32).
The tool carrier (31) is securely mounted on the bottom side of the
lower connecting arm (23) by fasteners and has a mounting surface
(311) opposite to the lower connecting arm (23). The relieving tool
(32) is securely mounted on the mounting surface (311) of the tool
carrier (31).
[0028] When the auto-scraping apparatus in accordance with the
present invention is used to scrape recesses in a work piece, the
driving motor (12) is electrically connected to a computer. The
computer comprises a shaft controlling card and a controlling
program formed by a software of Laboratory Virtual Instrumentation
Engineering Workbench (Lab-View). Then, the computer can control
the rotation of the driving shaft (121) of the driving motor (12).
With further reference to FIG. 6, the connecting rod (111) of the
connecting frame (11) is securely connected to a spindle (51) of a
CNC machine tool (50) and a work piece (40) is securely mounted on
a working table (52) of the CNC machine tool (50). Before scraping
the work piece (40), the spindle (51) is moved downward along a Z
axis direction by a three dimensional moving device of the CNC
machine tool (50) to correct pressure and record moving value of
the three dimension moving device. Then, location of the linking
device (20) is adjusted relative to the work piece (40) by the
three dimensional moving device of the CNC machine tool (50).
[0029] After adjusting the location of the linking device (20), the
driving motor (12) is actuated by the computer, the linking device
(20) is rotated relative to the connecting frame (11) by the
driving shaft (121). With reference to FIG. 3, the rotating wheel
(25) rotates relative to the upper connecting arm (22) when the
linking device (20) is rotated with the driving shaft (121) along
the abutting face (131) of the cam (13) between the middle and one
of the ends of the cam (13). With reference to FIG. 4, when the
rotating wheel (25) rotates and moves to the middle of the cam (13)
that is thicker than the ends of the cam (13), the linking device
(20) is pushed to move downward by the middle of the cam (13)
toward the work piece (40). Consequently, the relieving tool (32)
of the tool device (30) can scrape the work piece (40) to form a
recess (41) on a surface of the work piece (40). With reference to
FIG. 5, when the rotating wheel (25) rotates and moves to the other
end of the cam (13), the linking device (20) returns back to an
original height to move the relieving tool (32) of the tool device
(30) away from the surface of the work piece (40).
[0030] The driving shaft (121) is rotated in a circular motion
route relative to the connecting frame (11) by the driving motor
(12) and the circular motion route can be delineated into two
semicircular motion routes, respectively a front semicircular
motion route and a rear semicircular motion route. In the front
semicircular motion route of the driving shaft (121), the rotating
wheel (25) moves and abuts the abutting face (131) of the cam (13)
and the driving shaft (121) is rotated at a fixed rotating speed to
allow the relieving tool (32) scraping the surface of the work
piece (40). In the rear semicircular motion route of the driving
shaft (121), the rotating wheel (25) moves away from the abutting
face (131) of the cam (13) and the driving shaft (121) is rotated
back to the original position and the rotating speed of the driving
shaft (121) is decelerated to zero. Furthermore, during the rear
semicircular motion route of the driving shaft (121), the
auto-scraping apparatus moves relative to the work piece (40) by
the three dimension moving device of the CNC machine tool (50) to
form a new recess (41) on the work piece (40) in a next circular
motion route of the driving shaft (121). Repeating the
aforementioned scraping process, multiple recesses (41) can be
quickly and accurately formed in the surface of the work piece (41)
by the motion of the auto-scraping apparatus.
[0031] The whole weight of the auto-scraping apparatus in
accordance with the present invention is only 3.5 kilogram and can
be easily assembled to a CNC machine tool (50) by the connecting
rod (111) connected to a spindle (51) of the CNC machine tool (50).
The rotating speed of the driving shaft (121) can be adjusted by
the computer to control the scraping motion of the relieving tool
(32) of the tool device (30) to form recesses (41) in a surface of
a work piece (40). The depth of each recess (41) in the surface of
the work piece (40) can be adjusted to 10 to 20 nano-meters.
[0032] Even though numerous characteristics and advantages of the
present invention have been set forth in the foregoing description,
together with details of the structure and features of the
invention, the disclosure is illustrative only. Changes may be made
in the details, especially in matters of shape, size, and
arrangement of parts within the principles of the invention to the
full extent indicated by the broad general meaning of the terms in
which the appended claims are expressed.
* * * * *