CA2020969A1 - Adjustment and mounting device - Google Patents
Adjustment and mounting deviceInfo
- Publication number
- CA2020969A1 CA2020969A1 CA 2020969 CA2020969A CA2020969A1 CA 2020969 A1 CA2020969 A1 CA 2020969A1 CA 2020969 CA2020969 CA 2020969 CA 2020969 A CA2020969 A CA 2020969A CA 2020969 A1 CA2020969 A1 CA 2020969A1
- Authority
- CA
- Canada
- Prior art keywords
- fluid
- conduit
- workpiece holder
- adjustment
- operable
- 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.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q16/00—Equipment for precise positioning of tool or work into particular locations not otherwise provided for
-
- 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
- B23D41/00—Broaching machines or broaching devices characterised only by constructional features of particular parts
- B23D41/06—Broaching machines or broaching devices characterised only by constructional features of particular parts of devices for feeding, clamping, or ejecting workpieces
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Jigs For Machine Tools (AREA)
- Auxiliary Devices For Machine Tools (AREA)
Abstract
ABSTRACT
A mounting and adjustment device for a machine tool which has a workpiece holder and a positioning device acting on the workpiece holder. The positioning device is formed by a pressure chamber. An adjustment drive for actuation of the individual positioning device is a hydraulic system comprising a line connected to the pressure chamber and a heating or cooling device connected to the line to vary the volume in the system.
A mounting and adjustment device for a machine tool which has a workpiece holder and a positioning device acting on the workpiece holder. The positioning device is formed by a pressure chamber. An adjustment drive for actuation of the individual positioning device is a hydraulic system comprising a line connected to the pressure chamber and a heating or cooling device connected to the line to vary the volume in the system.
Description
The invention concerns a mounting and adjustment ~;
device for a machine tool for the machining of workpieces. -Devices of that type comprise a workpiece holder that accomodates the workpiece. Serving as workpiece, e.g., is a hollow body, such as a sleeve, a split bearing section or similar. The positioning device serves to move the workpiece holder with the workpiece retained in it to a specific position.
Prior devices of this type feature as positioning devices, adjustment screws which act in pairs on the workpiece holder so that, upon rotation, the workpiece holder with the workpiece-will undergo a position change.
Devices of that type have numerous disadvantages.
Especially, they are inaccurate. The positing screws have by their nature a hysteresis, as a result of which the positioning is not reproducible. Besides, devices of that type are ~ubject to wear. A particular shortcoming is that devices of that type are not controllable by computer.
It is therefore an object of the present invention to obviate or mitigate the above disadvantages.
According to the invention, there is provided a device for positioning and holding a clamping fixture on a machine tool comprising a plurality of hydraulically operable clamping devices located on opposite sides of said clamping fixture, at least one of said clamping fixtures being operable as a positioning device and having a fluid supply conduit connected thereto, and heat transfer means being associated wtih said fluid conduit to vary the temperature of fluid in said conduit and thereby the position of said clamping fixture.
In the preferred embodiment, high forces can be applied in the hydraulic system. Forces in the order of 10 ~--to 20 kN are possible. Individual positioning devices may act from both sides on the workpiece holder. In the ' : : , 2 ~ 6 ~
presence of high pressures, the action occurs with correspondingly high forces, resulting in great stability.
By utilizing a hydraulic system for the adjustment of the positing devices, wear and hysteresis is minimized and can readily be compensated for. It is possible to transmit very high forces with minimum travel. Due to using a heating device as the core element of the adjustment device, the conversion of an electrical signal to a corresponding movement takes place in a simple way.
An embodiment of the invention will now be described by way of example only with reference to the accompanying drawings in which Figure 1 shows a prior art holder for a broaching machine; and Figure 2 is a schematic representation of a positioning device.
Referring to Figure l, a known mounting and adjustment device for a broaching machine comprises a workpiece holder 1 which accomodates a workpiece 2, namely a split bearing section, which is indicated by a broken line. The positioning devices consist of thrust bolts 3 and traction bolts 4. Additionally provided are wedges 5,6 which in the present case serve the height adjustment of the workpiece holder.
Referring now to Figure 2 in which like components will be denoted by like reference numerals ~-with a suffix 'a' added for clarity, a workpiece holder la has a cylindrical recess 14 for accomodating a split bearing section not shown here. Adjustment of the :~--workpiece holder la is provided by a positioning device comprising a pressure chamber 7 located between walls 10,11. The chamber is formed by a hose type diaphragm 8,9 from flexible material and clamped in place on both of its ends by end plates 15. Connecting to the interior of the pressure chamber is a line 12 which establishes a . ~ .
2 ~ 2 ~
connection to a heating device 13. The latter serves to heat the fluid and change the volume of the fluid contained in the line 12 and chamber 7, for instance a hydraulic fluid or brake fluid. Activating the heating device 13 causes the fluid to expand and, since the fluid is incompressible, the increased volume is transmitted by way of the line 12 to the pressure chamber 7. As a result, the workpiece holder la with the workpiece is moved, an upward shift in the illustration according to Figure 2. When deactivating the heating device 13, and thus reducing the temperature of the pressure medium in the line 12 correspondingl~, the movement of the workpiece holder 1 takes place in the opposite direction, i.e. a travel in the sense of lowering occurs. The operation of the heating device 13 may be controlled by a suitable position control circuit or by a computer monitoring position and machine operation.
Also connected to the line 12 is a pressure generator 16 which produces a pressure in the line 12 and establishes the initial position of the holder la. The pressure generator 16 is in the form of a manually adjustable piston and cylinder device with a handle 17 secured to a rotatable piston rod 18. Rotation of the handle 17 displaces a piston 19 located within a cylinder 20 to vary the volume of the hydraulic system and allow subsequent adjustment by the heating device 13. To ;
provide precise positive control of the workpiece in both directions, it is preferred that the entire system consisting of workpiece holder, pressure chamber, line, heating device and pressure generator is duplicated at least one time so that another pressure chamber will be in existence on the side opposite the workpiece holder to chamber 7, as shown in the illustration above the workpiece holder la. Thus, the workpiece holder is mounted between at least two pressure chambers.
In the case of the illustrated embodiment, two additional pressure chambers 17 and 27 are indicated ,. ' '- , .~ ' ~ ' . ~ ' '. , ' ' . . . ' ; .
202~6~
strictly schematically, which bear on the side of the workpiece holder 1 opposite the pressure chamber 7.
These two additional chambers 17 and 27 are stressed by a single hydraulic system similar to that shown connected to the chamber 7 but not illustrated in detail here.
This forms the adjustment drive to provide positive displacement during both extension and retraction of the chamber 7. Obviously, the controls to the respective heating devices 13 will be arranged t operate in an opposite sense to effect the desired change of position.
It will also be appreciated that the two chambers 17 and 27 to two hydraulic systems could be arranged so that they are independent from each other.
This makes it possible to effect a tilting of the workpiece holder 1.
: - ' ' ~ ' ~ ' .' :-" :,:
:. : ~ . ' ' .
,:
:, . . . . .. . . .
device for a machine tool for the machining of workpieces. -Devices of that type comprise a workpiece holder that accomodates the workpiece. Serving as workpiece, e.g., is a hollow body, such as a sleeve, a split bearing section or similar. The positioning device serves to move the workpiece holder with the workpiece retained in it to a specific position.
Prior devices of this type feature as positioning devices, adjustment screws which act in pairs on the workpiece holder so that, upon rotation, the workpiece holder with the workpiece-will undergo a position change.
Devices of that type have numerous disadvantages.
Especially, they are inaccurate. The positing screws have by their nature a hysteresis, as a result of which the positioning is not reproducible. Besides, devices of that type are ~ubject to wear. A particular shortcoming is that devices of that type are not controllable by computer.
It is therefore an object of the present invention to obviate or mitigate the above disadvantages.
According to the invention, there is provided a device for positioning and holding a clamping fixture on a machine tool comprising a plurality of hydraulically operable clamping devices located on opposite sides of said clamping fixture, at least one of said clamping fixtures being operable as a positioning device and having a fluid supply conduit connected thereto, and heat transfer means being associated wtih said fluid conduit to vary the temperature of fluid in said conduit and thereby the position of said clamping fixture.
In the preferred embodiment, high forces can be applied in the hydraulic system. Forces in the order of 10 ~--to 20 kN are possible. Individual positioning devices may act from both sides on the workpiece holder. In the ' : : , 2 ~ 6 ~
presence of high pressures, the action occurs with correspondingly high forces, resulting in great stability.
By utilizing a hydraulic system for the adjustment of the positing devices, wear and hysteresis is minimized and can readily be compensated for. It is possible to transmit very high forces with minimum travel. Due to using a heating device as the core element of the adjustment device, the conversion of an electrical signal to a corresponding movement takes place in a simple way.
An embodiment of the invention will now be described by way of example only with reference to the accompanying drawings in which Figure 1 shows a prior art holder for a broaching machine; and Figure 2 is a schematic representation of a positioning device.
Referring to Figure l, a known mounting and adjustment device for a broaching machine comprises a workpiece holder 1 which accomodates a workpiece 2, namely a split bearing section, which is indicated by a broken line. The positioning devices consist of thrust bolts 3 and traction bolts 4. Additionally provided are wedges 5,6 which in the present case serve the height adjustment of the workpiece holder.
Referring now to Figure 2 in which like components will be denoted by like reference numerals ~-with a suffix 'a' added for clarity, a workpiece holder la has a cylindrical recess 14 for accomodating a split bearing section not shown here. Adjustment of the :~--workpiece holder la is provided by a positioning device comprising a pressure chamber 7 located between walls 10,11. The chamber is formed by a hose type diaphragm 8,9 from flexible material and clamped in place on both of its ends by end plates 15. Connecting to the interior of the pressure chamber is a line 12 which establishes a . ~ .
2 ~ 2 ~
connection to a heating device 13. The latter serves to heat the fluid and change the volume of the fluid contained in the line 12 and chamber 7, for instance a hydraulic fluid or brake fluid. Activating the heating device 13 causes the fluid to expand and, since the fluid is incompressible, the increased volume is transmitted by way of the line 12 to the pressure chamber 7. As a result, the workpiece holder la with the workpiece is moved, an upward shift in the illustration according to Figure 2. When deactivating the heating device 13, and thus reducing the temperature of the pressure medium in the line 12 correspondingl~, the movement of the workpiece holder 1 takes place in the opposite direction, i.e. a travel in the sense of lowering occurs. The operation of the heating device 13 may be controlled by a suitable position control circuit or by a computer monitoring position and machine operation.
Also connected to the line 12 is a pressure generator 16 which produces a pressure in the line 12 and establishes the initial position of the holder la. The pressure generator 16 is in the form of a manually adjustable piston and cylinder device with a handle 17 secured to a rotatable piston rod 18. Rotation of the handle 17 displaces a piston 19 located within a cylinder 20 to vary the volume of the hydraulic system and allow subsequent adjustment by the heating device 13. To ;
provide precise positive control of the workpiece in both directions, it is preferred that the entire system consisting of workpiece holder, pressure chamber, line, heating device and pressure generator is duplicated at least one time so that another pressure chamber will be in existence on the side opposite the workpiece holder to chamber 7, as shown in the illustration above the workpiece holder la. Thus, the workpiece holder is mounted between at least two pressure chambers.
In the case of the illustrated embodiment, two additional pressure chambers 17 and 27 are indicated ,. ' '- , .~ ' ~ ' . ~ ' '. , ' ' . . . ' ; .
202~6~
strictly schematically, which bear on the side of the workpiece holder 1 opposite the pressure chamber 7.
These two additional chambers 17 and 27 are stressed by a single hydraulic system similar to that shown connected to the chamber 7 but not illustrated in detail here.
This forms the adjustment drive to provide positive displacement during both extension and retraction of the chamber 7. Obviously, the controls to the respective heating devices 13 will be arranged t operate in an opposite sense to effect the desired change of position.
It will also be appreciated that the two chambers 17 and 27 to two hydraulic systems could be arranged so that they are independent from each other.
This makes it possible to effect a tilting of the workpiece holder 1.
: - ' ' ~ ' ~ ' .' :-" :,:
:. : ~ . ' ' .
,:
:, . . . . .. . . .
Claims (4)
1) A device for positioning and holding a clamping fixture on a machine tool comprising a plurality of hydraulically operable clamping devices located on opposite sides of said clamping fixture, at least one of said clamping fixtures being operable as a positioning device and having a fluid supply conduit connected thereto, and heat transfer means being associated with said fluid conduit to vary the temperature of fluid in said conduit and thereby the position of said clamping fixture.
2) A device according to claim 1 wherein fluid is supplied to said conduit by pressure generating means operable to establish an initial pressure therein.
3) A device according to claim 1 or 2 wherein said heat transfer means is electrically operated.
4) A device according to claim 1 or 2 wherein said heat transfer means is operable by position sensing means to effect change in volume of fluid in said conduit and thereby maintain a desired position of said clamping fixture.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3922844.4 | 1989-07-12 | ||
| DE19893922844 DE3922844A1 (en) | 1989-07-12 | 1989-07-12 | Work holding and positioning system for broaching machine - has thermally actuated fluid load capsule to precisely position work holder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2020969A1 true CA2020969A1 (en) | 1991-01-13 |
Family
ID=6384770
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2020969 Abandoned CA2020969A1 (en) | 1989-07-12 | 1990-07-11 | Adjustment and mounting device |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPH0355108A (en) |
| CA (1) | CA2020969A1 (en) |
| DE (1) | DE3922844A1 (en) |
| FI (1) | FI903355A0 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109605067A (en) * | 2019-02-11 | 2019-04-12 | 山东交通职业学院 | It is machined tooling |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102962692B (en) * | 2012-11-14 | 2015-12-16 | 安徽鑫龙电器股份有限公司 | A kind of vacuum circuit breaker mechanism part single key slot clamp for machining |
| CN110153493B (en) * | 2019-04-22 | 2020-06-16 | 杭州电子科技大学 | Plane broaching active vibration suppression clamp based on electro-hydraulic servo excitation and vibration suppression method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD17733A (en) * | ||||
| DE3502575A1 (en) * | 1984-01-28 | 1985-08-01 | Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen | Short-stroke clamping element |
-
1989
- 1989-07-12 DE DE19893922844 patent/DE3922844A1/en active Granted
-
1990
- 1990-07-03 FI FI903355A patent/FI903355A0/en not_active Application Discontinuation
- 1990-07-11 CA CA 2020969 patent/CA2020969A1/en not_active Abandoned
- 1990-07-11 JP JP18170990A patent/JPH0355108A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109605067A (en) * | 2019-02-11 | 2019-04-12 | 山东交通职业学院 | It is machined tooling |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0355108A (en) | 1991-03-08 |
| FI903355A0 (en) | 1990-07-03 |
| DE3922844C2 (en) | 1991-06-06 |
| DE3922844A1 (en) | 1991-01-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |