GB2078565A - Device for Transversely Dividing Non-circular Tubular Workpieces - Google Patents
Device for Transversely Dividing Non-circular Tubular Workpieces Download PDFInfo
- Publication number
- GB2078565A GB2078565A GB8115177A GB8115177A GB2078565A GB 2078565 A GB2078565 A GB 2078565A GB 8115177 A GB8115177 A GB 8115177A GB 8115177 A GB8115177 A GB 8115177A GB 2078565 A GB2078565 A GB 2078565A
- Authority
- GB
- United Kingdom
- Prior art keywords
- workpiece
- tool
- dividing
- dependence
- controllable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D59/00—Accessories specially designed for sawing machines or sawing devices
- B23D59/008—Accessories specially designed for sawing machines or sawing devices comprising computers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D45/00—Sawing machines or sawing devices with circular saw blades or with friction saw discs
- B23D45/10—Sawing machines or sawing devices with circular saw blades or with friction saw discs with a plurality of circular saw blades
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D45/00—Sawing machines or sawing devices with circular saw blades or with friction saw discs
- B23D45/12—Sawing machines or sawing devices with circular saw blades or with friction saw discs with a circular saw blade for cutting tubes
- B23D45/124—Sawing machines or sawing devices with circular saw blades or with friction saw discs with a circular saw blade for cutting tubes the workpieces turning about their longitudinal axis during the cutting operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D47/00—Sawing machines or sawing devices working with circular saw blades, characterised only by constructional features of particular parts
- B23D47/08—Sawing machines or sawing devices working with circular saw blades, characterised only by constructional features of particular parts of devices for bringing the circular saw blade to the workpiece or removing same therefrom
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
- B26D3/16—Cutting rods or tubes transversely
- B26D3/161—Cutting rods or tubes transversely for obtaining more than one product at a time
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/416—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by control of velocity, acceleration or deceleration
- G05B19/4166—Controlling feed or in-feed
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/36—Nc in input of data, input key till input tape
- G05B2219/36512—Select by a selector, dip switch
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/36—Nc in input of data, input key till input tape
- G05B2219/36513—Select out of a plurality of programs, patterns
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/45—Nc applications
- G05B2219/45044—Cutting
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/45—Nc applications
- G05B2219/45145—Milling
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/50—Machine tool, machine tool null till machine tool work handling
- G05B2219/50305—For every diameter a tape
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Human Computer Interaction (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Milling Processes (AREA)
Abstract
The device comprises workpiece support rollers in the form of two fixed drive rollers 2, 3 and in a radially- movable yoke 9, two guide rollers 4, 5. A rotary milling cutter 10 is arranged between arms 11 and 12 of the yoke and the radial position of the cutter 10 and the thrust on it is controlled by a calculator and store unit 14 by way of a D.C. motor 13. In this way the cutter is controlled in dependence upon the non-circular contour of the workpiece, as recorded in the unit 14. In an alternative apparatus the workpiece is supported internally by an expanding mandrel. The control of the dividing cutters is the same. <IMAGE>
Description
SPECIFICATION
Device for Transversely Dividing Non-circular
Tubular Work-pieces
The invention relates to a device for transversely dividing non-circular tubular,
rotatable workpieces, particularly piston ring
blanks, by means of a dividing tool which can be fed in radially against the workpiece.
It is common practice, for the rotation of non
circular workpieces that are to be divided, to load them onto a drivable gripping mandrel. This
mandrel, the outer envelope of which consists of
an elongated rubber sleeve, is radially expansible,
so that the rubber sleeve, in the operating
condition, drives the workpiece by friction. The
dividing tool, which may consist of milling cutters,
saws, turning tools or the like, engages the outer
circumferential surface of the non-circular
workpiece and divides the same.In this case, it
must be considered disadvantageous that, in
addition to a positive damaging of the outer
circumferential region of the rubber sleeve,
caused by the non-circular contour of the
workpiece, relatively powerful vibrations of the
whole device occur, which are dependent on the
speed of and thrust on the tool and the non
circular contour of the workpiece concerned. This
results not only in the occurrence of tool
breakages, but also in a reduction of the overall
efficiency of the device.
A device for transversely dividing tubular
workpiece is known through DE-PS 1,627,160,
which consists of three rollers, having their axes
parallel, which are arranged in the form of an
imaginary triangle. One of them is formed as a
stress-applying and return roller, while the other
two serve as guide rollers, at least one of these
two being radially adjustable. An endless band,
which serves for receiving the workpiece, is
guided over the rollers in such a manner that it
forms a loop, extending into the triangle and
allowing an angle of grip more than 1800. On the
side opposite the loop, is located the dividing tool,
which can be moved radially towards the
workpiece.Particularly in the case of non-circular
workpieces, the same disadvantages arise in this
case as those that have already been mentioned
in connection with dividing with the aid of a
gripping mandrel, the only difference being that in
this case the band is damaged not by the dividing
tool, but by sharp edges or burrs which are
formed on the workpiece during dividing.
In accordance with the present invention the
radial infeed movement of the tool is controllable
in dependence upon the non-circular contour of
the workpiece. A reduction in the length of the
Teed stroke is obtained by a copying movement which is superimposed on the feed movement of
the dividing tool. With conventional devices, the
feed stroke (I) is calculated from the wall thickness (aR) of the workpiece + half the non
circularity
+ the run up and over-run movement (11) of the dividing tool. Combined into a shorter formula, there is obtained
in which uR=the greater outer diameter-the smaller outer diameter of the workpiece.
According to the features of the invention, the feed stroke (I) is reduced by the value
The following calculation is accordingly obtained for the feed stroke l=+li.
It is thus clear that a substantially shorter operating process is obtained as a result of the reduction in the feed stroke, which (shorter operating process) does not ultimately lead to an increase in the wastage of workpieces and hence leads to the greater economy. A prerequisite for an operation according to the features of this invention is, however, that the workpieces are placed in the device in a known orientation.
According to a further concept of the invention, the radial infeed movement is electronically controllable. Naturally, it is also possible to control the infeed movement mechanically; this, however, necessitates, in addition to the relatively expensive manufacture of the individual parts, the inclusion in the mechanical control of, for example, a new cam for each non-circular contour. These disadvantages are substantially eliminated by the use of a calculating and storage unit into which any desired non-circular contour, with reference to a nominal diameter, can be fed.
With workpieces of different diameters, the calculator need only have regard to the steps in the nominal diameter. Advantageously the calculator is connected with only one single direct current motor, stepping motor or the like which controls not only the radial thrust, but also at the same time the infeed movement, in dependence upon the non-circular contour of the workpiece.
Furthermore, it may be considered advantageous that it should be possible for the magnitude of the thrust during the dividing process to be varied in dependence upon the feed stroke, the cutting force, the power consumption and the torque.
In addition, it is also possible to control the copying movement of the tool which corresponds to the non-circularity of the workpiece suitably in dependence upon the cutting force, the power consumption and the torque.
The invention is illustrated in the drawing and is described in greater detail in the following.
There are shown: Figure 1. Device with tension rollers bearing against the outer circumferential surface of the workpiece.
Figure 2. Device with a workpiece which is loaded onto a pneumatically expansible mandrel.
Figure 1 shows a general arrangement drawing of a device having the essential features of the invention. The workpiece 1, which is of noncircular tubular form, is held under stress between rollers 2, 3, 4, 5. Two of the rollers 2, 3 are arranged on a stationary girder 6 and are drivable.
The rollers of the second pair of rollers 4, 5 are rotatably mounted on the free ends 7, 8 of a substantially U-shaped girder 9 which is movable radially with respect to the workpiece 1, towards and away from it. The dividing tool 10, in the form of a milling cutter, is arranged between the two arms 1 1, 12 of the girder 9 and is likewise drivable. The milling cutter follows the noncircular contour of the workpiece while at the same time being subjected to thrust by means of a direct current motor 13 which is controlled by a calculator-store-unit 14. In this way a reduction in the length of the feed stroke is achieved.
Figure 2 likewise shows a general arrangement drawing of a device having the essential features of the invention. The non-circular workpiece 1 5 is in this case, in contrast to Figure 1, loaded onto a gripping mandrel 16. Shown in a simplified manner, the gripping mandrel 16 consists of a rotary chamber 17 which is connected to a compressor 18 by means of a flexible pipe 19.
The chamber 17 is enclosed on the radially outer side by an elongated rubber sleeve 20 which is radially expansible by means of the compressed air that is supplied to it.
When the non-circular workpiece 15 is loaded onto the gripping mandrel 16 and the latter is expanded, the device is caused to rotate, whereupon the workpiece 15 is driven by friction of the rubber sleeve 20. The counter-rntating dividing milling cutter unit 21, which as in Figure 1 is controllable by a direct current motor 13 and a calculator-store-unit 14, follows the noncircular contour of the workpiece 15 and, on cutting (completely) through (the latter), damages the outer layer of the rubber sleeve 20. A plurality of non-circular contours related to one nominal workpiece diameter have been fed into the store of the unit 14, so that, when the workpiece is changed, the calculator need only receive the new diameter and the desired non-circular contour in order, for its part, to control the direct current motor and hence the milling cutter unit.
Claims (4)
1. A device for transversely dividing noncircular tubular, rotatable workpieces, particularly piston ring blanks, by means of a dividing tool which can be fed in radially against the workpiece, characterised in that the radial infeed movement of the tool is controllable in dependence upon the non-circular contour of the workpiece.
2. A device according to claim 1, characterised in that the infeed movement is controllable electronically.
3. A device according to claim 1 or 2, characterised in that the radial thrust and at the same time the infeed movement are controllable by a direct current motor in dependence upon the non-circular contour of the workpiece.
4. A device according to any of claims 1 to 3, characterised in that the infeed movement is controllable in dependence upon the cutting power of the tool.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19803024132 DE3024132A1 (en) | 1980-06-27 | 1980-06-27 | DEVICE FOR RADIAL SEPARATION FROM UNCIRCULAR BUSH-SHAPED WORKPIECES |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2078565A true GB2078565A (en) | 1982-01-13 |
Family
ID=6105624
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8115177A Withdrawn GB2078565A (en) | 1980-06-27 | 1981-05-18 | Device for Transversely Dividing Non-circular Tubular Workpieces |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS5715619A (en) |
| DE (1) | DE3024132A1 (en) |
| GB (1) | GB2078565A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1048384A2 (en) * | 1999-04-19 | 2000-11-02 | T-Drill Oy | System for presetting the cutting tools of a cut-off machine for a pipe or a shaft |
| EP1110681A2 (en) * | 1999-11-09 | 2001-06-27 | Giovanni Gambini | Device for cutting rolls of paper |
| WO2002028580A1 (en) * | 2000-10-05 | 2002-04-11 | Honda Giken Kogyo Kabushiki Kaisha | Cutting device for sheet metal drum |
| US20120079925A1 (en) * | 2009-02-27 | 2012-04-05 | Carina Petersson | Knife holder of a tube cutting unit for tube manufacturing and a system and use of the system for tube manufacturing |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19500083A1 (en) * | 1995-01-04 | 1996-07-11 | Schulte Hans Peter | Method of shortening tubular pieces |
| JP5723984B2 (en) * | 2010-07-09 | 2015-05-27 | エサブ・アーベー | Roller conveyor with electric clutch |
-
1980
- 1980-06-27 DE DE19803024132 patent/DE3024132A1/en not_active Withdrawn
-
1981
- 1981-05-14 JP JP7152581A patent/JPS5715619A/en active Pending
- 1981-05-18 GB GB8115177A patent/GB2078565A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1048384A2 (en) * | 1999-04-19 | 2000-11-02 | T-Drill Oy | System for presetting the cutting tools of a cut-off machine for a pipe or a shaft |
| EP1048384A3 (en) * | 1999-04-19 | 2001-04-11 | T-Drill Oy | System for presetting the cutting tools of a cut-off machine for a pipe or a shaft |
| EP1110681A2 (en) * | 1999-11-09 | 2001-06-27 | Giovanni Gambini | Device for cutting rolls of paper |
| EP1110681A3 (en) * | 1999-11-09 | 2004-10-20 | Giovanni Gambini | Device for cutting rolls of paper |
| WO2002028580A1 (en) * | 2000-10-05 | 2002-04-11 | Honda Giken Kogyo Kabushiki Kaisha | Cutting device for sheet metal drum |
| US20120079925A1 (en) * | 2009-02-27 | 2012-04-05 | Carina Petersson | Knife holder of a tube cutting unit for tube manufacturing and a system and use of the system for tube manufacturing |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3024132A1 (en) | 1982-01-21 |
| JPS5715619A (en) | 1982-01-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |