Mandrel for clamping workpieces

专利摘要:
Mandrel for clamping workpieces (2) which are formed by rotation about an axis of rotation by means of a lathe, the mandrel (1) being designed as a rod-shaped shaft (1), which transmits rotational movements and moments to a clamped workpiece (2), by being introduced into a central opening (3) provided on the workpiece (2), a substantially cylindrical ring (4) made of an elastic material being used on the shaft (1) for inserting and later fixing the mandrel in the opening (3) , preferably made of rubber, is provided, which can be pressed together by means of a pressure disc (5) and which causes the essentially cylindrical ring (4) to change in diameter and press against the wall of the opening (3), in order to press the workpiece (2) reversibly fixable on the mandrel.
公开号:AT16548U1
申请号:TGM50108/2012U
申请日:2012-11-14
公开日:2020-01-15
发明作者:
申请人:Konrad Hofer；
IPC主号:

专利说明:

CLAMPING ARM FOR CLAMPING WORKPIECES The invention relates to a clamping mandrel for clamping workpieces which are formed by rotation about an axis of rotation by means of a lathe (preferably a turning lathe), the clamping mandrel being designed as a rod-shaped shaft which exhibits rotational movements and moments forwards a clamped workpiece by inserting it into a central opening (for example a bore) provided on the workpiece. The mandrel according to the invention is primarily, but not exclusively, used for turning wooden workpieces, for example wooden mills such as spice mills, nutmeg mills, pepper mills and the like, and for example candle holders, tealight holders, bottle corks etc.
At the present time, such workpieces are clamped on a lathe between tips on the headstock and tailstock or attached to one side of the headstock by means of a chuck (lathe chuck) and set in rotation.
Especially in mills with a plug-in grinder, the upper and lower parts of the mill have to be turned separately, and it is difficult to manufacture the transition from the upper part to the lower part with a precise fit. Repeated reclamping of the workpieces is absolutely necessary and causes an imbalance that often results from this. In addition, the space around the workpiece when turning is limited and thus hinders easy machining of the workpiece.
The use of commercially available mandrels is not possible when machining workpieces of the type mentioned, since they are not designed for such machining purposes. In addition, workpieces are typically fixed on the shaft of the mandrel using a nut or screw, by axially pressing them against a counter-holder in the form of a cone, cone, web, shoulder or the like, which can lead to deformation of the wooden workpiece.
The present invention is therefore based on the object to provide a tool for manufacturing, in particular for turning workpieces of the type mentioned, which enables a safe, centered and easy clamping possibility of the workpieces to be machined.
According to the invention the above object is achieved with the features of claim 1. Advantageous embodiments of the mandrel according to the invention are specified in the dependent claims.
Thereafter, a mandrel of the type mentioned is characterized in that a substantially cylindrical ring made of an elastic material, preferably made of rubber, is provided on the shaft for inserting and later fixing the mandrel, which can be compressed by means of a pressure disc and causes the essentially cylindrical ring to change its diameter and press against the wall of the opening in order to reversibly fix the workpiece on the mandrel.
After fixing the workpiece on the mandrel, the mandrel is clamped on the lathe in a chuck (with the longest possible jaws), so that the outside of the workpiece can be processed with a lot of space. Of course, the workpiece can also be fixed to the mandrel after the mandrel has been clamped on the lathe.
In the exemplary production of a pepper mill, the upper part of the mill can be plugged onto the pre-turned lower part (bunging technology) and can thus be freely turned.
The advantage also lies in the centered clamping of the workpiece, with a perfect / 6
AT 16 548 U1 2020-01-15 Austrian patent office ter transition from top to bottom of the mill can be turned. Unsightly protrusions from top to bottom are avoided.
Further advantages of the mandrel according to the invention are a centered clamping possibility of the workpiece, a high degree of space when turning, the lack of the need to reclamp the workpieces and a free external design of the workpieces also on the end face.
fixes the mandrel in a workpiece; an exploded view of the mandrel;
the mandrel as assembled in Fig. 2;
the mandrel in a further embodiment;
the mandrel with thorns and additional washer.
1 shows an advantageous embodiment of the mandrel in a plant. Further objectives, features, advantages and possible uses of the mandrel according to the invention result from the following description of an embodiment with reference to the drawing. In the drawings, Fig. 1 [0014] Fig. 2 [0015] Fig. 3 [0016] Fig. 4 [0017] Fig. 5 [0018] are fixed in piece 2. As can be seen from FIG. 1, the workpiece 2, here a wooden cylinder for making a wooden mill, has a central through opening 3.
On the shaft 1 - as can be seen from the exploded view of the mandrel in Figure 2, a cylindrical bulge 10 is provided, on which the ring 4 is placed. The diameter of the cylindrical bulge 10 advantageously corresponds approximately to the inner diameter of the ring 4.
By means of the thrust washer 5 shown, which in this embodiment can be fastened to the shaft 1 by means of at least one screw 7, the ring 4 is pressed together, in order to change its diameter, to press against the wall of the opening 3. The workpiece 2 is reversibly fixed on the mandrel. The thrust washer 5 preferably has approximately the same diameter as the shaft 1 of the mandrel.
Figure 3 shows the mandrel as assembled in Figure 2. The ring 4 bulges outward due to the pressure of the thrust washer 5.
Fig. 4 shows the mandrel in a further embodiment. In this embodiment, thorns 8 are provided on the outside of the thrust washer 5. This embodiment of the thrust washer 5 is used for clamping workpieces 2 with a cylindrical non-through opening 3, for example nutmeg mills or stem vases.
As can be seen from Figure 5, an additional disc 5a is advantageously provided in front of the thrust washer 5, on which the mandrels 8 are spaced apart. By means of the thrust washer 5 and the thrust washer 5a and the externally spaced mandrels 8, which can be fastened to the shaft 1 by plugging in until the workpiece 2 stops with a cylindrical, non-continuous opening 3 and (preferably clockwise) turning the workpiece 2 the ring 4 pressed together to change its diameter, to press against the wall of the opening 3. The workpiece is thus fixed on the mandrel. For this purpose, a bolt 11 (screw), which is provided with an external thread, is provided on the thrust washer 5a and screws into the thread 9 due to the rotation of the workpiece 2. The thrust washer 5 has a suitable opening in the center through which the bolt 11 extends.
2.6
AT 16 548 U1 2020-01-15 Austrian
Patent Office
THE REFERENCE NUMBERS
wave
workpiece
Opening cylindrical ring thrust washer
Disc with thorns 8
Chuck / jaw screw
thorns
thread
bulge
Bolt with external thread on 5a
3.6
AT 16 548 U1 2020-01-15 Austrian patent office
Expectations

权利要求:
Claims (4)
[1]
1. mandrel for clamping workpieces (2), which are formed by rotation about an axis of rotation by means of a lathe, the mandrel (1) being designed as a rod-shaped shaft (1), which rotary movements and moments on a clamped workpiece (2) forwards by inserting it into a central opening (3) provided on the workpiece (2), characterized in that an essentially cylindrical ring (4.) on the shaft (1) for inserting and later fixing the mandrel in the opening (3) ) made of an elastic material, preferably rubber, which can be pressed together by means of a pressure disc (5) and which causes the essentially cylindrical ring (4) to change in diameter and press against the wall of the opening (3) to reversibly fix the workpiece (2) on the mandrel.
[2]
2. mandrel according to claim 1, characterized in that on the shaft (1) a cylindrical bulge (10) is provided, on which the ring (4) is placed.
[3]
3. mandrel according to claims 1 and 2, characterized in that the thrust washer (5) by means of at least one screw (7) on the shaft (1) can be fastened.
[4]
4. mandrel according to one of the preceding claims, characterized in that on the pressure plate (5) or on an additional pressure plate (5a) spaced outside thorns (8) are provided.

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同族专利:

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引用文献:

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公开号 | 申请日 | 公开日 | 申请人 | 专利标题

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GB629797A|1947-12-02|1949-09-28|M G A Ind Ltd|Improvements in or relating to a device for supporting an article in a turning lathe|

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CH540083A|1972-01-08|1973-08-15|Rene Gerber Ag|Workpiece mandrel|

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JPS60249518A|1984-05-22|1985-12-10|Kubota Ltd|Clamping device of cylindrical dust molded structure|

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SU1756027A1|1990-01-23|1992-08-23|Ровенский Научно-Исследовательский Институт Технологии Машиностроения|Expanding mandrel|

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DE102015005776B4|2015-05-08|2016-12-08|Leitz Gmbh & Co. Kg|Device for the play-free clamping of a component, in particular a tool, and component for use in the device|

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CN105665768B|2015-11-27|2017-12-01|宁波市北仑鑫林机电模具有限公司|A kind of frock of quick tensioner workpiece|

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CN108480662A|2018-03-18|2018-09-04|胡君分|A kind of cylinder cap automatic loading unloading device of digital controlled lathe|

法律状态:
2021-07-15| MM01| Lapse because of not paying annual fees|Effective date: 20201130 |

优先权:

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申请号 | 申请日 | 专利标题

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DE202012000801U|DE202012000801U1|2012-01-27|2012-01-27|Mandrel for clamping workpieces|

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