DE1554813A1 - Injection molding process for the production of items such as storage systems - Google Patents

Description

DipL-Ing. H. ZOEPKL

dJo / TH

UV. PHILIPS 'GLOHLAMPSJiFABaHXEN, BNDHOVSN / HOLUND

"Injection molding process used to manufacture items such as storage systems."

co The invention relates to a Spritegues-

<o process for the manufacture of objects from a «« e>

⁰⁰ plastic filled with metal particles by means of cn

__> an injection molding machine mix a piston or a

cn 5 screw and a heating cylinder.

Objects that are subjected to sliding loads during use, such as bearing shells,

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must have good thermal conductivity; the exposed surface of the object is also wear-resistant and be self-lubricating.

To achieve a Ksss strength dtr Injection molded items, a dimensional stability and the required load capacity are filled and with Consideration of the desired good thermal conductivity, especially plastics filled with metal particles used.

In Fraxie one chooses for this purpose in; generally random or fibrous ICetal particles or very fine metal powder.

However, pies has the disadvantage that the surface properties such as Abnutzungefeetigkeit and self-lubrication, which · be determined by dl · d choice ·· · plastic "due dee fillers" impaired w _"f rt3en

Sin «tlt ·! *? Disadvantage i »t dtr» da ·· di · • o filled · Kunetetoffee ··· old Spritegueweaachinen Canoe cannot be made well. Di · Haet «brings Constipation and Terachl ·! ·· of the Spritzgueenaeohine and tool wi matrices with see

Sa · Injection molding process ti | pB t »I, however particularly good for producing a large number uniform product · from thewooplastic · » or thermosetting synthetic fabrics.

In this process, the Kunet-Etoff introduced into a room (heating cylinder), where it is heated to the softening temperature. Thereon

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is the plastic by means of a piston or a Snail from this ra into a heated or unheated one Pressed die. The plastic then fills the Matrix and quickly changes to the solid state. The lavrize is opened and the product is pushed in. With the machines used in practice, the entire process is carried out automatically with a large Speed,

When processing plastic compounds, which advises arbitrary or fibrous formed metallic particles or filled with very fine metal powders, great wear occurs between the piston or screw and the wall of the heating surface. The fillers are on these areas have a strong abrasive effect. At large, arbitrarily formed filler particles can even serious damage occurs.

The metal particles are easily deposited in the softened plastic mass. Ee arise as a result Metal concentrations at the exit openings the machine acting as a sieve and blockages bring about.

The invention aims «the mentioned, in the injection molding process for with metal particles

co. plastic masses encountered difficulties ο

* ° to be eliminated.

® Eb has been found to be the mentioned

- »Difficulties do not arise and that still be special

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<n advantages can be obtained if an artist is used in the described method,

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PHN.1228

which contains a metal powder as a filler, the particles of which are spherical and have a diameter that larger than the clearance between pistons or Auger and the heater vlinder.

In this regard, spherical particles are understood to mean particles that move in all directions have the same or almost the same dimensions (diameter).

The clearance between the piston and the heating cylinder is "in the usual S ^ ritZgusemaechinen mostly .-. 02 to ϋ. υ4 mm.

Very good results were achieved with such · »

I. machines achieved by using a plastic compound. which use a metal powder as a filler. spherical parts with a diameter between 0. G75 and C.15C mm, which is about 3 to 4 times that diameter Wiggle room between the piston or the screw and the hot cylinder amounts to.

When using the filled plastic compound according to the invention, the wear and tear of the screw or the piston and the heating cylinder for the most part eliminated. This results, for example, from the fact that the pressure loss in an injection molding cylinder due to the friction of the material along the walls, the filled material is not greater than that of the *; - not filled material. When using this material, after six months there is still no indication of any EU regulations Wear of the injection cylinder or dies

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compared to unfilled plastics.

Another advantage is that the spherical particles press each other under pressure opposite to be able to move well. When processing the plastic mass with the spherical metal parts as a filler, no clogging occurs.

A filler based on spherical particles of hard alloys is preferably used like copper bronze, brass, copper beryllium and aluminum * made of minium bronze. The pure metals like Köpfer and Aluminum generally deforms easily when pressed, so that the spherical font is lost Iron is with regard to corrosion properties and the considerably lower thermal conductivity than that of the alloys mentioned is less lntereeeant.

2 · has calibrated that Kun ** »toffeaeee · with a high fill factor using the naefc der - | Invention can be processed. With a volume ' Percentage up to about £ 60 of the spherical metal * particles do not experience any difficulties with the>. Processing of the plastic-filler mixture on The thermal conductivity of the Maeae is then so great ·· «. ep that special precautions with regard to the rapid ■

to hardening and solidification of the mass. co

co must. In the first case, which relates to the processing tn

^ obtained from thermosetting plastics, a y, cooled die and in the second case, the calibration on the

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Processing of thermoplastic plastics,

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a heated die must be used. Very good Results were filled with a bia of 40 percent by volume Mass achieved. Very good quality walls of 0.4 mm could be sprayed. It is preferable Do not use more than 30 percent by volume of the filler. Below this percentage the thermal conductivity decreases off very quickly. Since a high fill factor is possible, materials with extremely low shrinkage can be used be used when the plastic hardens or solidifies. This allows a very high degree of Achieve accuracy and reproducibility.

The load capacity and the service life of a storage system are tng related to the heat dissipation. When using an * unfilled plastic CD
With regard to the low thermal conductivity of plastics and the often low material fat content due to high expansion coefficients, it is desirable to make the bearing shell as thin as possible. However, the minimum dimension of the wall of these trays is determined by the practical manufacturing possibilities and by the required mechanical strength and the possibility of fastening.

By using the method according to the invention, bearing shells can now be produced whose wall thickness is e.g. 0.3 to 0.4 mm. Their thermal conductivity and strength are the same as those a bearing shell of an unfilled plastic

with a wall thickness of 0.1 to 0.2 mm. Also in terms of 909065/1359

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on heating, these bearing shells have the same properties as bearing shells made from unfilled Plastic. When the plastic solidifies or hardens along the walls of the die, the spherical metal particles become Surprisingly pushed inwards in the still soft material. It arises in this way a product with a wall of the chosen plastic and a core with a high fill factor en metal

t-

particles that have good thermal conductivity.

Leave in the method according to the invention

All duroh injection molding processes processable, thermo-setting and thenao-plastiechen plastics use.

In DTR production Ton.Lagersystemen but preferably Polyaldehydeharzt _f polymeric Pluorkohlenwasaerstoffe and polyamide such as nylon · used. In the manufacture of these systems, a bearing metal such as copper bronze or aluminum bronze is preferably used as the filler. If the surface layer of the plastic initially used for this purpose has been worn too far, the function of the bearing can then possibly be stopped.

If a thtrmo-hardening plastic is processed, the plastic is in powder form and the metal powder in the desired ratio mixed and the mixture optionally becomes tablets pressed "

The powder mixture or the tablets

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are kept in ο en heating cylinders. After the calibration temperature has been reached, the mass is pressed into the die and hardened. When using a f..ermo _; In the case of chemical plastic, the plastic and the metal powder are mixed in the desired ratio in an extrusion machine, heated and extruded in thin strands. These strands are chopped into granules. In order to achieve a more homely hatred »*, this processing can be repeated. The granulate obtained in this way is then processed by a Sr. injection molding machine.

In the manufacture of lacertyetenes You can insert the screws directly into a metal bearing bush with Pefestiguntsschriuben. Threads or other anchorages be injected in a bearing shield.

Because a high cheese strength is achieved is, ee is also ab'glieh self-adjusting ball joint bearings bearing bushes turned directly into spherical scents splash.

Mttjillager can be injected in layers chi id er % m trated, so that costly turning work is unnecessary. Spherical spherical bearings that adjust the bearings can be pretted in three bearings while maintaining the adjustability

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Claims (5)

PATEKTJBtSPROECHE t fly method for the manufacture of objects sue one with et al particles _; Filled plastic & asse! .. by means of a Ciritzgussn.aecLine sit a piston or a screw and a circular cylinder. characterized in that a plastic material is used which contains a metal powder as a filler, the particles of which are spherical and have a diameter which is greater than the clearance between the piston or corner and the heating cylinder. 2. The method according to Ans ruoh 1, characterized in that a plastic compound is used which is filled with spherical llet all particles, whose diameter is 3 to 4 times the clearance between Piston or screw and heating cylinder is. 3. The method NaOH claims 1 and 2, characterized gekeansei CHMT _f ·· as an art "to ff aas se used vlrxS, dii old kugwXlfin Teilofaen a hard wi · tupierbroaa · ,, Kee * ing, Kapferberjlllpp * is. 4. Method according to claims 1, 2 and 3, characterized in that «the« in · Kuaetatoffmasee is used, the 30 to 60 Volaauraproxent a « Contains filler, i.e. made of spherical metal particles beeteht. 5. Objects, especially storage systems " or parts thereof, which by the process according to the Claims 1 to 4 are made .. 909885/1359. BAD ORfS