DE2362792A1 - SOCKET FOR SUPPORTING A LONGITUDINAL PIECE OF MATERIAL - Google Patents

Description

Bushing for supporting a ^j

elongated piece of material

The invention relates to a socket for supporting a- ' an elongated piece of material in a hollow material carrier.

In the manufacturing sector, it is known to produce workpieces from lengths of material produce that have a predetermined cross-sectional profile. There are bar or tube semi-finished products with square, round, hexagonal, tubular or other special < profiles in embossing. The preset profile is very often through Hot rolling of a long piece of material produced in a rolling mill; after rolling, the rolled stock is cut to lengths of 5.4 to 6.1 m (18 to 20 feet) for handling and transportation can be. The material lengths are very often at one end face a sharp-edged lip that is created when cutting to length. The semi-finished product is very often bent or curved during the rolling process; the same can happen when handling or transporting the semi-finished product.

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A length of material is inserted into a machine tool and detected there by a chuck while machining steps on the material such as milling, drilling, heat treatment, etc. Like. Be carried out at one end of the semifinished product. The edited section is then cut off or separated from the material length and provides the finished machined. Workpiece represent; thereafter the material length is advanced and the machining process for 'Repeated creation of another workpiece. At least at. 'Some of the processing steps is the rotation of the touch standing semi-finished product required with stationary tools. Complex workpieces make a series of production steps necessary; multi-spindle machine tools are used for this purpose have been created that have, for example, six to eight processing stations. The material is then from station to Station moved to carry out additional processing steps until the workpiece is completed.

It is common for the length of material to be aligned with your head of the machine tool to support hitting the free end the length of the material. To the known facilities, A tubular? --- material carrier is required to support the length of the material with an inner diameter that is large enough to accommodate a bent or curved semi-finished product section is chosen.

It is known to support the free end of the length of material to use a steel bushing in the tubular material carrier. The known steel bushings usually have a central

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ge opening, the diameter of which is large enough to allow overshooting ben the socket over the free end of the semi-finished product and the protruding there Enable lips. The socket is made with the help of Adjusting screws attached to the material. The known sockets have a substantially cylindrical shape, wherein the diameter is so much smaller than the inner diameter of the hollow material carrier that when the material is advanced a sliding movement is possible in the carrier. The difference in diameter must also take into account that the bush does not get jammed in the carrier when the socket is on a bent or curved semi-finished product is attached.

The use of steel bushings to reduce the whip movement of the free end of the length of the semi-finished product within the material carrier has led to various problems. One problem is that the operator has to remove the bushing when the free end of the semi-finished product approaches the chuck of the machine tool in order to prevent contact between the bushing and the head of the machine tool. Another problem - is to be seen in that the jack beats within the carrier material when the material length is rotated. This hammer movement is disadvantageous in that it leads to an inadmissible noise level; it also generates vibrations which can lead to loosening of the set screws, so that the bushing is prematurely stripped of the material length. It is also known that the vibrations damage the bearings of the material carriers. .

It is therefore the object of the present invention to provide a socket

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for supporting an elongated piece of material in one to create hollow material carriers in which the disadvantages of Steel bushing can be avoided.

The bushing according to the invention consists of an elastically resilient, flexible body which is formed from a rubber-like material and a resiliently deformable outer surface which can be brought into sliding engagement with the interior of the hollow material carrier and a 'longitudinally extending central opening which is determined by elongated gripping surface sections, which gripping surface sections are arranged in such a way that they elastically encompass outer surface areas of the piece of material. The socket is therefore made of a firm, stretchable, tear-resistant rubber-like material. It leads to a reduction in the noise level and avoids the development of vibrations. The bushing ^: is also provided with an undersized central opening, which is stretched when the bushing is pushed onto the free end of the material length, so that the bushing elastically encompasses the semi-finished product and thus adjusting screws for fastening the socket to the semi-finished product come into port. If the free end of the material! -

length is fed into the machine, the chuck touches the. Jack from the semi-finished product without the operator intervening

must fen. ^!

Another advantage of the socket according to the invention is in their

Flexibility to see, so that its outside dimension is very close! the inner dimension of the tubular material carrier used j can be performed without setting in the material carrier j

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a must be feared, as the bushing when engaging with the ierkstoffträger can deform. The tightly seated bushing decreased the range of motion of the free end of the semi-finished product relative to the inner wall of the tool carrier, so that the possibility of a

Hammer movement is reduced. The material from which the support bushing is shaped is selected so that it

Noise or vibration development that would otherwise be dampened by the movement of the semi-finished product relative to the material carrier could be.

Another advantage is the frictional engagement of the socket with the material carrier, so that a friction drive is built up, enclosed which the outer surface of the AbsSitzbuchse with the inner surface of the tubular The carrier is engaged in such a way that the tubular carrier is in its bearing upon rotation of the semi-finished product through the head the machine tool is rotated in its bearing, whereby a

"Another source for a relative movement between the semi-finished product and I.

Carrier is avoided.

i) The invention will now be described in more detail with reference to the accompanying figures will. It shows:

ig. 1 shows a perspective illustration of a multi-spindle machine tool with a material carrier device, FIG. 2 an isometric illustration partly shown as a section. View of an embodiment of the bushing according to the invention for supporting an elongated piece of material in a hollow material carrier in FIG

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■ j

Pig. 1 material support device shown and j

ι i Pig. 3 shows a partial section through a material carrier and

i 'a bushing supporting a length of material.

| ln the Pig. 1 shows a multi-spindle machine tool 10 to which a work carrier device 11 is assigned. The machine tool 10 has a rotary head 12 to which a series ^:

ίνοη chucks I ^ belong. In the pig. 1 two chucks are visible. Each chuck 15 detects a corresponding material + · ilänge 14 drawn into the rotary head and thence to a ^machining: is tung gear subjected. For some machining operations, the chuck 1J5 must rotate the length of the material with respect to the rotary head 12. After completion of the one processing step, the rotary head 12 is rotated or incremented in order to lead the material sounds to the next processing station, at which a further

The next processing step is carried out.

The material conveying device 11 includes two stands 16, on each of which a rotatable bearing plate 17 is supported. The. Bearing plates 17 are rotatably mounted to when rotating the rotary head

! l2 of the machine tool 10 for moving the material from a Processing station to be able to rotate with the other. The la-

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; ger plates I7 each support a series of tubular work-

Istof carrier 18 from. Every spindle or processing station of the!

Machine tool 10 is assigned a carrier 18. When shown:

th embodiment, six material carriers 18 are provided. La- j iger 19, which are arranged in the bearing plates I7, support the individual tubular carrier 18 so that the material carrier j

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can rotate with respect to the bearing plate.

The material lengths 14 are delivered in 'lengths of 5.4 to 6.1 m and can be due to deformation during handling. and be slightly bent during transport. A length of material 14
is pushed into the material carrier 18 from the free end,
which is aligned with the chuck 15 associated with the first processing station. The one end protruding from the material carrier is gripped by the chuck, while the free end
distant end lies within the material carrier 18.

In FIG. 2, now is the _v jack of the invention for supporting the plant to ff length 14 and darjgestellt isometric, partly in section. The support bushing is preferably made of a rubber-like

, formed into a material that has good oil resistance, Wear resistance, good elasticity and flexibility |

and good impact resistance has been selected. For the an-!

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Suitable materials for the intended purpose are available in the form of polyurethane elastomers and / or filled polyurethane elastomers are available. These materials can be made by casting processes with accept- J tolerances and allow a wide selection of the physical properties of the bushing.

The polyure used in the manufacture of the support bushing 21! ■ jthan elastomers are easily produced by the reaction of a; polyester, a polyether glycol or a polyester amide with
a polyisocyanate produced. In particular, a diisocyanate _; from the benzene series used. Other reactive substances such as j

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Catalysts, crosslinking agents, water and polyhydric alcohols are used. Fillers, surfactants, and other additives can also be used. Preferably the support bushing 21 is made of hardened polyurethane, which has a very high tensile strength and in the is outstandingly wear-resistant.

The polyester urethanes used to make the inventive Support bushings are those high molecular weight, reaction products that result from reaction of terminal reactive Linear polyesters containing hydroxyl groups with diisocyanates. As an example those polyesters should be named, obtained in the esterification-condensation of a dicarboxylic acid or its anhydride with an excess of glycol.

The polyesters used in the invention are esterified-condensation at least one dicarboxylic acid or its anhydride with the structural formula

HOOC - R-COOH

formed with a glycol, where R is a divalent hydrocarbon radical with one to twelve carbon atoms. Preferably, the acids malonic acid, succinic acid, glutaric acid, Adipic acid, pimelic acid, sebacic acid, suberic acid, azelaic acid, maleic acid, itaconic acid, phthalic acid, and terephthalic acid Isophthalic acid can be used. Other acids are possible.

The glycols reacted with the dicarboxylic acids are generally by the structural formula

HO — R ¹ —OH - 9 -

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'where R ^{1 is} a divalent hydrocarbon radical having two to twelve carbon atoms. These glycols also include • ethylene glycol, propylene glycol, trimethylene glycol, tetramethylenglycol, butene, diol, butenediol, pentamethylene glycol, hexamethylene glycol, cyclohexylene glycol, heptamethylene glycol, etc.

The polyether glycols used in the practice of the invention j are those derived from alkylene oxides, glycols or heterocyclici Ethers can be derived and by the formula

HO (R ¹¹ O) IiH

can be represented, where R ^{11 is} an alkylene radical having two to twelve hydrocarbon atoms and where η is greater than one. As with the polyesters, it is not necessary that all of the alkylene groups be the same, and so can. Polyatherglycols are used with a mixture of residues. The Polyarylenglycole, _# where R '' is an arylene radical and polyarylene Alkylenätherglycole such as Polyäthylenphenylenätherglycol and mixtures thereof with polyalkylene ether glycols are also useful.

According to the invention, the molecular weights of the polyester glycols, polyester amides and polyether glycols can be between 1.50 and 10,000 with the range between 400 and 4000 being preferred. The acid number of the polyester glycols and polyester amides is in generally below 10 and preferably below 4.

The polyisocyanates used in the production of the polyether and polyester urethanes and the polyester amide urethanes according to the invention that can be best used are those that follow the

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correspond to the structural formula:

OCN-R '"- NCO

where R ¹¹ 'is a divalent hydrocarbon radical with two to fourteen carbon atoms. The preferred diisocyanates are the aromatic diisocyanates, such as tolylene, 2,4-diisocyanate, ortho-meta and para-phenylene diisocyanate, naphthalene-1,5-diisocyanate, Diphenylmethane-p-p'-diisocyanate and mixtures thereof.

Can be used as fillers for reinforcement of polyurethane elastomers Carbon black, calcium carbonate, silica, calcium silicate, Dixie clay and the like can be used.

Preferably, the outer surface 22 of the support bushing 21 is substantially cylindrical in shape to facilitate casting; other shapes, such as a coil shape, can be used Wish to be used. Preferably at least a portion of the surface 22 is inwardly extending from the end faces 23 and 24 extends, just a little bit smaller in diameter than the inner diameter of the tubular material carrier 18 in which the support bushing 21 is to be used. In the middle is the support bush 21 is provided with an opening 26 which extends between the two end faces 23 and 24. The opening 26 has at least one pair of opposing gripping surface sections on, which capture the associated material length 14 elastically can.

In a preferred embodiment of the invention, the opening 26 formed with a surface shape that of the surface

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the assigned material length is closely matched. To between the Material and the bushing to achieve the desired level of guiding effect with the smallest material length.

In the embodiment shown in FIG. 2, the opening is 26 with several opposite pairs of surfaces 28 and 29, 30 and 31/32 and 33 and 34 and 35 equipped, their distance a small is slightly smaller than the distance between the assigned surfaces of the material length l4 on which the support bushing is used target. The bushing shown in FIG. 2 is therefore intended to be used in a rod-shaped semi-finished product with a special profile will; but of course a support bushing can be of any shape also for semi-finished products with more common cross-sectional profiles such as tubular, square, round and hexagonal semi-finished products.

A support bushing according to the invention was molded from filled polyurethane which is sold as "PROTHANE 301" by Prothane Ltd., Toronto, Canada, and has a durometer hardness of 80 Shore and a specific weight of 1.3 (US units) Bay Shore rebound of 35 % and a tear strength with a test specimen C, PI, compression set ASTM-A-350, a negative tension of 21.1 kg / cm with a deflection of 20 fo and a negative tension with a deflection of 40% of 56.2 kg / cm. The outer dimension of the bushing was approximately 1.3 tnrn smaller than the inner dimension of the associated material carrier. Opposing faces of the central opening of the socket had a 0.36 and 0.7 mm (0.015 to 0.030 inch), respectively, than that

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corresponding surfaces of the material length on which the support bushing 21 should be used. The socket formed in this way

'' grasped the material length tightly and stayed during the advance

of the material length in the tubular material carrier in its place and yet has been stripped of the remaining material length by the chuck when the last section of the material length is inserted into the machine tool. This stripping was carried out without operator intervention and without damage to the machine tool or the support sleeve itself. Next, the noise level was reduced in the vicinity of the machine tool in beachtens- '■ wertem dimensions and vibrations in the material carriers were reduced. ^:

3 shows a support bushing 21 pushed onto the free end of the workpiece flange 14 '. From Fig. 3 it can be seen that a pair of the opposing gripping surfaces, namely the surfaces 32 and 33, are deformed when they grip around the corresponding surfaces 36 and 37 of the material length 14 _: elastically. Furthermore, the surface 22 in the vicinity of the end faces 23 and 24 is also subject to elastic deformation, specifically in the areas in which the surface comes into contact with the inner wall 38 of the tubular material carrier 18. The material length 14 has a surface 39 corresponding to the surface 29 of the bushing, while the surfaces 40 and 41 correspond to the surfaces 30 and 31 of the bushing. A sharply protruding lip 42 belongs to the surface 41, while the surface 36 has a sharply protruding lip 43. Other surfaces of the semi-finished rod 14 can have similar sharp edge areas,

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'resulting from cutting the semi-finished product to length. The single support bush 21 can because of their elastic properties and their

Wear resistance repeated over these sharp-edged areas

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can be postponed and removed without harming it. Included At the same time, it retains its good elastic gripping properties. ! support for holding the semi-finished bar.

The support bushing according to the invention is therefore an elastic, repeated one usable Abstützbuehse, which in particular leads to a substantial Reduction of the noise and vibration generation leads and reduces the amount of time that the operator of the Must devote material support device.

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Claims (2)

Claims f 1. Bushing for .Abstützung an elongated piece of material in a hollow material carrier, characterized in that the bushing consists of an elastic resilient flexible body (21) which is formed from a rubber-like material and a resiliently deformable outer surface (22) which can be brought into sliding engagement with the interior of the hollow material carrier (18) and has a longitudinally extending central opening (26) which is defined by elongated gripping surface sections (28,29; 50,31j52,35; 3S4,55) is which gripping surface sections are arranged such that they elastically grip around outer surface areas of the piece of material. 2. Socket according to claim 1, characterized in that the socket body (21) is formed from a polyurethane elastomer and the gripping surface sections are arranged and distributed so that they have a central opening (26) of such a shape and - 15 409825/0406 such a dimension determine that for the inclusion of a Material pieces (14) an expansion of the socket body is necessary is. 409825/0406 Blank page