DE932808C - Injection machine for cable sheaths - Google Patents
Injection machine for cable sheathsInfo
- Publication number
- DE932808C DE932808C DEF1170D DEF0001170D DE932808C DE 932808 C DE932808 C DE 932808C DE F1170 D DEF1170 D DE F1170D DE F0001170 D DEF0001170 D DE F0001170D DE 932808 C DE932808 C DE 932808C
- Authority
- DE
- Germany
- Prior art keywords
- cable core
- diameter
- injection machine
- hollow mandrel
- cable
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/14—Insulating conductors or cables by extrusion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/05—Filamentary, e.g. strands
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/06—Rod-shaped
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Description
Spritzmaschine für Kabelmäntel Bei den als Spritzmaschinen bezeichneten Strangpressen, die man für die Herstellung von Gummi-oder Kunststoffmänteln elektrischer Kabel verwendet, müssen das Mundstück und der Hohldorn, durch den die isolierte Kabelseele zum Mundstück geführt wird, möglichst genau mittig zueinander eingestellt sein, damit der Kabelmantel allseitig gleich stark ausfallen kann. Aber auch bei mittiger Einstellung von Hohldorn und Mundstück kommt es vor, daß der Kabelmantel auf einer Seite eine größere Wandstärke erhält als auf der anderen.Injection machine for cable sheaths In the case of those referred to as injection molding machines Extrusion, which is used for the production of rubber or plastic electrical jackets Cable used must have the mouthpiece and the hollow mandrel through which the insulated Cable core is led to the mouthpiece, set as precisely as possible in the middle of each other so that the cable sheath can be equally strong on all sides. But also with If the hollow mandrel and the mouthpiece are in the middle, the cable sheath receives a greater wall thickness on one side than on the other.
Diese Ungleichmäßigkeiten haben ihre Ursache darin, daß der Durchmesser der isolierten Kabelseele nicht völlig gleichmäßig eingehalten werden kann, sondern Schwankungen aufweist, die stellenweise je nach dem Kabeldurchmesser o,I bis 1,0 mm und mehr betragen können. Mit diesen Durchmesserschwankungen muß bei der Bemessung des Hohldornes der Spritzmaschine gerechnet werden, will man nicht Gefahr laufen, daß eine dickere Stelle der isolierten Kabelseele im Hohldorn steckenbleibt. Deswegen wird die Bohrung in der Spitze des Hohldornes bei mittleren Kabeldurchmessern in der Regel um etwa 5!io mm größer gewählt als der mittlere Durchmesser der isolierten Kabelseele, beispielsweise IO,5 mm Bohrung der Spitze des Hohldornes bei einem Kabelseelendurchmesser von im Mittel IO mm. Das hat aber zur Folge, daß sich die Kabelseele bei einer Durchmesserschwankung nach unten im Hohldorn aus der Mitte verlagern kann, in dem Beispiel, angenommen bei 9,8 mm Durchmesser der isolierten Kabelseele, schon um den Betrag von 0,7 mm nach jeder Seite, wodurch dann die Kabelseele einseitig in den Mantel eingelagert wird und der Kabelmantel entsprechend einseitig ausfällt. Dies mag bei einem dicken Kabelmantel nicht viel ausmachen, wirkt sich aber bei einem Kabel mit verhältnismäßig dünnem Mantel sehr nachteilig aus, weil dabei leicht der ohnehin schon dünne Mantel einseitig so stark geschwächt wird, daß die geforderte - Mindestwandstärke nicht mehr eingehalten werden kann und unter Umständen der Kabelmantel schon bei seiner Herstellung lückenhaft wird.These irregularities are caused by the fact that the diameter the insulated cable core cannot be adhered to in a completely uniform manner, but rather Has fluctuations that in places depending on the cable diameter o, I to 1.0 mm and more. With these diameter fluctuations, when dimensioning of the hollow mandrel of the injection molding machine, you don't want to run the risk of that a thicker part of the insulated cable core gets stuck in the hollow mandrel. Because of this the hole in the tip of the hollow mandrel for medium cable diameters is in as a rule selected to be about 50 mm larger than the mean diameter of the isolated Cable core, for example IO, 5 mm hole in the tip of the hollow mandrel with a cable core diameter of on average IO mm. However, this has the consequence that the cable core changes in the event of a fluctuation in diameter can shift down in the hollow mandrel from the center, in the example, assumed with 9.8 mm diameter of the insulated cable core, by the amount 0.7 mm on each side, which then puts the cable core into the jacket on one side is stored and the cable jacket fails accordingly on one side. This may be the case a thick cable jacket doesn't really matter, but it does affect a cable relatively thin coat very disadvantageous because it is easy anyway even a thin coat is weakened so much on one side that the required minimum wall thickness can no longer be adhered to and under certain circumstances the cable sheath is included its production becomes incomplete.
Nach der Erfindung lassen sich diese Nachteile der bisherigen Bauart vermeiden. Die Erfindung besteht darin, daß in die Bohrung an der Spitze des Hohldornes Längsriefen eingearbeitet sind. According to the invention, these disadvantages of the previous design avoid. The invention consists in that in the bore at the tip of the hollow mandrel Longitudinal grooves are incorporated.
Die Anzahl der Längs riefen wird vorteilhaft etwa so groß gewählt, wie der Durchmesser der isolierten Kabelseele in Millimetern beträgt. Der Durchmesser des der gerieften Bohrung der Dornspitze einbeschriebenen Kreises ist zweckmäßig etwas kleiner als der mittlere Durchmesser der isolierten Kabelseele. Der Durchmesser des der gerieften Bohrung umbeschriebenen Kreises ist zweckmäßig etwas größer als der größte vorkommende Durchmesser der Kabelseele. Die in die Dornbohrung eingearbeiteten Längsriefen gestatten dann in jedem Falle ein Ausweichen auch der größten Verdickungen, ohne daß die Gefahr besteht, daß sich die Kabelseele bei abnehmendem Durchmesser außermittig verlagert. Die Ausbildung der Spritzmaschine nach der Erfindung hat auch noch den Vorteil, daß bei plötzlichen Verdickungen der Kabelseele die unvermeidlichen Lufteinschlüsse wesentlich verringert werden.The number of longitudinal grooves is advantageously chosen as large as how the diameter of the insulated cable core is in millimeters. The diameter the circle inscribed in the grooved hole in the tip of the mandrel is appropriate slightly smaller than the mean diameter of the insulated cable core. The diameter of the circle circumscribed by the grooved hole is appropriately slightly larger than the largest occurring diameter of the cable core. The ones worked into the mandrel bore Longitudinal grooves then in any case allow evasion of even the greatest thickenings, without the risk of the cable core becoming smaller as the diameter decreases shifted off-center. The training of the injection molding machine according to the invention has also the advantage that with sudden thickening of the cable core the unavoidable Air inclusions are significantly reduced.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEF1170D DE932808C (en) | 1942-08-02 | 1942-08-02 | Injection machine for cable sheaths |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEF1170D DE932808C (en) | 1942-08-02 | 1942-08-02 | Injection machine for cable sheaths |
Publications (1)
Publication Number | Publication Date |
---|---|
DE932808C true DE932808C (en) | 1955-09-08 |
Family
ID=7082750
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEF1170D Expired DE932808C (en) | 1942-08-02 | 1942-08-02 | Injection machine for cable sheaths |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE932808C (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB374160A (en) * | 1931-03-09 | 1932-06-09 | Quasi Arc Co Ltd | Improvements in electrodes or welding rods for use in electric arc welding |
-
1942
- 1942-08-02 DE DEF1170D patent/DE932808C/en not_active Expired
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB374160A (en) * | 1931-03-09 | 1932-06-09 | Quasi Arc Co Ltd | Improvements in electrodes or welding rods for use in electric arc welding |
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