DE1151089B - Process for the production of cylinders, sinker rings or dials for circular knitting machines - Google Patents

Description

The invention relates to a method for the production of cylinders, sinker rings or dials for circular knitting machines.

The production of such cylinders, plate rings or dials is usually done by milling, Pushing or broaching the grooves and requires a relatively large amount of time and extreme accuracy. Especially with finer cylinder pitches, for example on circular knitting machines for the production of seamless fine stockings with 400 to 500 needles on a circumference of 300 mm, difficulties arise in the completion according to the known methods.

Since you cannot go below certain minimum dimensions during machining, because in the production of very fine grooves by milling, pushing or broaching due to the lack of space forming chips, the cutting tools and the workpiece itself may be damaged There is a limit to the production of cylinders with an even finer pitch using conventional methods set.

These difficulties arise even when in the cylinder or sinker ring or in the dial Grooves of only relatively shallow depth are incorporated, in which one then guide webs made of steel glued in, pressed in or soldered in.

In order to overcome these disadvantages, various methods of manufacturing knitting machine cylinders have been used developed.

Thus, a method is known in which a cylinder from a cylindrical base body and U-shaped bent profiles made of resistant material as a running surface for the needles or sinkers is put together. In this process, the profiles are either inserted into milled grooves or only lined up on the unslotted surface of the base body and the gaps poured out with solder.

Apart from the fact that the production of such profiles for fine pitches runs into difficulties, When assembling such a cylinder without pre-milled grooves, tight tolerances must be adhered to difficult.

It is also known to mill grooves into the cylinder body and two needle bars into these grooves to be used together with an intermediate bridge. However, this procedure has by working out of grooves the disadvantages already mentioned above.

A method has also already become known in which webs with attached intermediate webs mounted on a smooth cylindrical body

Process for the manufacture of cylinders,

Sinker rings or dials

for circular knitting machines

Applicant:

Schubert & Salzer machine factory
Aktiengesellschaft, Ingolstadt

Dipl.-Ing. Christian Strobel, Ingolstadt,

has been named as the inventor

The co-inventors have requested

not to be named

get stuck. Apart from the fact that it is extremely difficult to produce profiled webs so precisely, that the exact division can be maintained in the finished cylinder and the webs without gaps are tight against each other, it is almost impossible to place the webs on the smooth cylinder body like this put on and clamped so that they are exactly parallel to the cylinder axis and by the clamping pressure not be compressed.

These disadvantages mentioned become grooved according to the method according to the invention for producing Cylinders, sinker rings and dials for circular knitting machines avoided that webs in the Grooves of a negative die are used, then intermediate webs in the negative die between the webs are used in such a way that they sit on the negative webs of the negative die, on which the Negative die with the bars and intermediate bars used together with the base body in a bandage form is used, in which the webs, intermediate webs and body are optionally warm or cold-curing plastics or by cast metallurgical or die-cast metallurgical or ceramic or sintered ceramic bonds are connected to one another, the binding agent being known per se Way in anchoring grooves, especially dovetail grooves, in the webs and intermediate webs on the one hand and the I-beam on the other

309 619/26

on the other hand, whereupon the finished workpiece from the negative die after it has been removed from the binding form is expelled. The negative matrix can also be used in the layering and binding process be made with the hooves of a positive model.

With this method it is possible, even with fine ones, without machining grooves in the surface Graduations to produce cylinders, sinker rings or dials in a short time in an efficient way.

According to the invention, a thermosetting, thermoplastic, ceramic, powder metallurgical, cast metallurgical, but especially a die-cast metallurgical bond between web and I-joist application.

Processes of this type are known per se from literature. In the following, however, it will be brief discussed:

1. With a thermoset bond, the connection of parts, especially of metal

to be connected webs of the cylinder, sinker ring and / or the dial is in a Mold prepared before die casting. The preparation takes place on the basis of a negative from Cylinder, sinker ring or dial. The negative, for example the cylinder, arises as an internally toothed tubular body, so it is to a certain extent an inner knitting cylinder in which Grooves that are used to create the webs to be stacked on the outer knitting cylinder. After this The bound outer cylinder is die-cast from the inner cylinder with the ejection device ejected from the die-casting machine and is almost ready-to-use from the casting mold. Compared to thermosetting and thermoplastic binding, cast and die-cast binding have the advantage that the binder has high chemical and thermal strength. Compared to the ceramic and Composite casting has powder metallurgical bonding

share, by means of the hot-pressing process on plastic 20 the advantage that it, in particular as a die-cast

Resin press deformable and after hot use of relatively low-melting metals, such as

press hardening phenolic resin powder into tin, zinc or aluminum alloys that are

draws. Inorganic parts of the phenols are not subjected to very high thermal stresses,

or organic filler powder added. In the case of a die-cast composite cylinder, both

2. Thermoplastic bonding means that, for example, on integrated cylinder webs, which Binding of parts with thermoplastic material before layering a hardness of about 50 Rocks. Here, the binding in injection molds is shown well, after the composite casting only one and usually carried out with the help of the extruder. Decrease of about 3 hardness units measured. the

3. Under a ceramic bond, the connection between the webs is maintained at a temperature of only approx of parts by means of ceramic masses to 30 150 to 200 ° C.

stand. There are kneadable ceramics such. B. Tone The following description relates to etc., application which, after the binding part, only applies to the cylinder. Their transfer to pia forms mostly thermal, but also cold, hardened tinenring and dial is self-evident,
will. The necessary devices and the structure

4. The powder metallurgical bond refers to 35 of the cylinder, the sinker ring or the Rippman the joining of parts by means of the sintered disk is correct for all of the above under 1 to 6 metal powder. Sinterable steel powder binding processes are largely the same, see above mixture and yellow metal powder mixture that in the description and the drawings as Use. According to the example, the container only needs to be treated with composite die-casting molds are sintered. Just like that needs to be 40.

mixed binding is therefore suitable for the powder. Further details of the invention are provided

Metallurgical bonds only for parts that can withstand the sintering temperature of the binder. Steel parts can sometimes be connected using the sintering process.

5. The joining of parts by means of liquid metals is under cast metallurgical bonding to understand. This process is known as "composite casting" and "casting around" for Cast steel, gray cast iron, light metal cast, zinc cast and brass. Steel parts are mostly made using the composite casting process bound. The process is new in its application to cylinders, sinker rings and dials.

With regard to composite casting, reference is made to German patents 447 018 and 481 363.

6. A die-cast metallurgical bond is the term used for composite casting, which is carried out on die-casting machines will be produced. There can be found tin, zinc and

Hand of the drawings described in more detail.

Figures 1 and 2 show parts of cylinders of known type in cross-section;

3 and 5 show the construction of a cylinder according to the method according to the invention in detail;

FIGS. 4 a, 4 b and 6 show the anchoring of the webs in longitudinal section in relation to FIGS. 3 and 5;

7 shows the structure of a model cylinder or a die;

FIG. 8 shows the anchoring of the webs according to FIG. 7;

9 shows a detail of a finished cylinder still in the die;

10 and 11 show the structure of a sinker ring according to the method according to the invention.

Fig. 1 of the drawing shows in cross section part of a known cylinder of an older type.

It has milled deep grooves, which are called needle aluminum alloys serve as a binding metal seduction. The cylinder is out of full turn. The liquid metal is, mostly on tubular body by machining grooves in its Cold chamber die casting machines, manufactured under high external surface.

Pressure is injected into the mold, being very In Fig. 2 is part of a known cylinder

finely atomized and therefore also shown very finely professional newer construction in cross section. Of the

fills lined cavities. It gives large shape- 65 tubular body has shallow grooves which in its

faithful and is for binding a cylinder, surface z. B. have been milled. These grooves

Sink ring or ribbed disk layer works are not used for needle guidance, but for

preferably suitable. The shift work, d. H. the inclusion of webs, which are glued in, pressed in

5 6

or soldered in. These bars used are also used to produce the negative die NEN of the needle guide as a cheek, and the head of the composite method according to the invention milled advantageous Bridges are the reason that can be used and made possible with high precision. A completed one Pin grooves formed by ridges. example is shown in Fig. 7 in cross section and in

Fig. 3 shows part of a cylinder, which is shown according to Fig. 8 in longitudinal section, is produced according to the method according to the invention. A Moim is used to produce the negative die Cross-section. It consists of the stacked dell cylinders with cylinder bars arranged on its outer circumference 2, the intermediate webs 3 and a Neten groove, which is exactly the desired knitted body 1. The binding material is labeled 4. cylinder and the high indexing accuracy and The webs 2 serve as guide cheeks for needles with processing precision. He can for example and slide, while the intermediate webs the base from solid on an optical part head the needle or slide guide. As being milled.

Intermediate webs Steel webs of great hardness Use The model cylinder is marked 5. In his

can find is also the wear resistance on the grooves are the negative webs 6 and between them

the base of the groove in this cylinder structure very 15 the negative intermediate webs 7 inserted. They have

high, in any case higher than with cylinders, both of which are already dovetailed on the outside.

known design, such as kerungsnuten in Fig. 1 and 2. Together with the basic cast body

are shown. ring 8 is this layering in the die casting mold

The binding material, e.g. thermoset, thermoplastic, or a mold for thermoplastic material

Die-cast metal, must be aligned in both the body 1 and 20. Then with casting or thermoplastic

can also be anchored well in bars 2 and 3. Shem material of this container 6, 7 bound. Of the

Parts 1, 2 and 3 are therefore given a suitable binding agent. Then the

anchoring profiles into which the liquid or partial model cylinder 5 is ejected and then the negative

gigen state of the binding material 4 adhesive, adhesive matrix 6, 7, 8, 9 removed from the mold,

or self-locking embeds and thereby the ² 5 The model cylinder can be used for the production of a

can achieve the actual binding effect. or several other negative matrices

There are different variants for such a turn.

Anchoring profile for the base body 1 and usually a hundred or more of these are relative Bars 2 and 3. It is best to use dovetail-cheaper negative matrices for fabrication grooves. This type of anchoring is made, for example, 30 die-casting machines in order to become a flowin Fig. 4 a and 4 b come in a longitudinal section through the manufacture of the cylinder. Cylinder of Fig. 3 shown. The dovetail without a particularly precise production through specialist tail grooves of bars 2 and 3 and the basic body forces or on precision machines gets the pers 1 form dovetail grooved rings, in which the negative die is formed by the model cylinder high geders Binder 4 hugs like a bandage and 35 accuracy.

holds container 1, 2, 3 together. A cross-section in FIG. 9, which is layered into the negative die and sometimes ab-sometimes, can be shown on a base body 1, which is bound cylinder is to be produced in sections in a steel or other metal. The designations are drawn. Instead, the binding material 4 can serve as a web support for the negative die in FIGS. 7 and 8. This is in Fig. 5 in the transverse 40 and for the cylinder in Figs. 3, 4 a and 4 b. The cut and shown in Fig. 6 in longitudinal section. Positive webs 2 are placed between the negative webs 6 with a view to the warpage, in particular, and between the webs 2 the Podere are layered in pressure composite casting, the wall thickness of the tubular intermediate webs 3 so that they are tightly selected binder body 4 as thin as possible sit on the heads of the negative webs 6. They are used to avoid accumulation of material. 45 negative die 6, 7, 8, 9, together with the positive, is poured into the cast. B. the die, used. Last binding process, the production of the negative is always unchanged on the die casting machine, which is mounted for the stacking of the container. Then on the machine with the and the device for binding in a binding 50 binder 4 is bound. Then the finished positive form is used. Container 1, 2, 3, 4 ejected, the negative die 6, According to the above, a cylinder 7, 8, 9 is taken out of the mold and re-fitted with the one whose bore has grooves that are coated on the positive webs 2, 3 as the negative die . Meanwhile, the external knitting cylinder will form negative internal teeth, another fully coated negative die 6, 7, the. 55 8, 9 used in the form of the die casting machine

The production of such an internal toothing with and bound with the binder 4, a fineness of 50 gauge or more, both of which are usually several, for example a hundred negatives a number of 400 grooves or more dies are available, is a flow production 300 mm inner circumference, with a movement of the knitting cylinder, the sinker rings and the Groove length (cylinder length) from 100 to 300 mm, 60 dials with high precision are possible, only possible on broaching machines. Broaching should have been the production of a cylinder rather grooving is technical but lasted about 6 to 10 hours with the current and only by specialist aids hardly feasible, since the web thickness is only used on automatic precision machines about 0.4 and less millimeters, the groove width could only be carried out, a composite can be about 0.3 and less millimeters, so that the 65 cylinder with the method according to the invention in Broaches are produced in a much shorter time on the press due to the lack of space Chips break frequently during machining, whereby become. Layering and manufacturing the piece mostly becomes scrap. the bars on punching machines is auxiliary work.

The transfer of the cylinder construction described above to the construction of the sinker ring is in 10 and 11 shown in cross section.

FIG. 10 shows a sinker ring and FIG. 11 shows the plan view of part of this sinker ring. Of the The sinker ring is composed of a base body 10, the guide webs 11, which act as a guide cheek serve, and the intermediate webs 12, which serve as a plate guide in the groove base. The shift work 11, 12 is united with the base body ring 10 by the binding material 13 to form one piece. The binder 13 is on the sides facing it of the base body ring 10, the guide webs 11 and the intermediate webs 12 anchored in dovetail grooves.

The dial is built up in a similar way, so there is no longer a drawing for its construction is necessary. Here, too, the bars are stacked in a negative matrix. The coated negative die is used together with a base in the form of a bandage, e.g. B. the die, for binding prepared and then bound. The negative die can be milled or as described Laminated bandages are produced. In the case of very fine divisions, the latter is also used here prefer.

Claims (3)

PATENT CLAIMS: 1. A process for the production of grooved cylinders, sinker rings and dials for circular knitting machines, whereby the webs delimiting the grooves are connected at the pitch to a smooth, un-grooved base body forming the web support, -that is, marked dies (6, 7, 8, 9) are used , then between the webs intermediate webs (3) are inserted into the negative die in such a way that they sit on the negative webs (6) of the negative die, then the negative die with the inserted webs and intermediate webs together with the base body (1) is inserted into a binding form, in which the webs, intermediate webs and base bodies are connected to one another by either hot or cold-curing plastics or by cast metallurgical or die-cast metallurgical or ceramic or sintered ceramic bonds, the binding agent in anchoring grooves, in particular dovetail grooves, in the webs and intermediate webs on the one hand and in the I-joists on the other hand, it penetrates, whereupon the finished workpiece is ejected from the negative die after it has been removed from the binding form. 2. The method according to claim 1, characterized in that the negative die in the Layering and binding process is produced with the help of a positive model. 3. The method according to claim 1 or 2, characterized in that the separate base body (1, 8) saved and the binding material body (4, 9) is used as a web support. net that the webs (2) in the grooves of a negative 35 and 128. Considered publications:
German patent specifications No. 939 016, 909 884,
140, 735,668;
British Patent No. 583,337;
U.S. Patent No. 2,873,595;
Reimer, "Druckguß", Munich, 1959, p. 127 1 sheet of drawings © 309 619/26 6.63