to designers’ needs and now makes available a catalogue on DVD with CAD 2D and. 3D drawings of all its products. General index. ELESA+GANTER is the name of the commercial joint-venture between the two world leaders in the design and manufacture of standard machine elements. Search in Ganter catalogs and technical brochures on DirectIndustry and find the information you need in 1 click.
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Mechanical Properties Of Plastic Products. Thermoplastic polymer materials in which the chemical composition of the molecular chain provides a wide range of mechanical, thermal, and technological properties. The transformation process is based on the melting and subsequent hardening by solidification of the material in the mould. The material itself has a low environmental impact because it can be recycled reversible solidification.
In any case, due to the properties of the materials and the measures taken during the design stage, these products may also be used for outdoor applications, where they are exposed cataloguue various atmospheric agents. Products made of these catakogue may undergo slight changes in size due to the absorption of water, which may gantsr dimensional tolerances. The absorption of water results in a significant increase in impact strength.
The following polymers do not absorb water: When used in outdoor applications, it is advisable to prevent water accumulating on the product by installing in such a way that water runs off it quickly.
Specific resistance tests have been carried out using specific equipment for accelerated ageing testing, in accordance with the ISO standard, and setting the following parameters: In general, elesz results show that the mechanical strength of polyamide PApolypropylene PP and Duroplast PF products is not significantly reduced by exposure to UV rays.
As to the elesw appearance of samples exposed to the action of the UV rays, in some cases a slight variation in the surface appearance of the product was found, on completion of the tests. Despite the considerable difficulties encountered in maintaining the tolerances in a machining process in which numerous factors influence the end result, the size of the diameter of the axial hole is normally respected with a catalotue of C The handles may therefore also be assembled on pins made from normal drawn parts.
If the pin is obtained by turning from a bar with a greater diameter, a machining process with a tolerance of h11 is recommended, as this gives a suitable free coupling, with the advantage of a quick, simple and inexpensive machining process. They are normally kept undersized so that assembly is slightly forced at ambient temperature. In this case, for reasons related to the process technology and the type of plastic, which may absorb small amounts of moisture from the outside environment, the tolerances must be interpreted taking this into account though the tightening of the component assembled is never actually jeopardized in practice.
Information The connection between the operating devices and the axis consists very often of a cross pin or a grub screw.
As a result the user is faced with relatively high costs since cross holes cataalogue operating devices are in general not readily available. Components with cross holes to GN are not only offered at very competitive prices but they also save the manufacturer unnecessary drawing work. The geometrical form of some of the operating devices, however, does not lend itself to modification to this particular GN standard.
The radial positioning of the cross holes is only specified as per above three specifications of product groups control levers, cranked handles, handwheels. For all other operating devices it can be arranged any way.
The pin hole gwnter H11 is drilled ganer suit drive spring pins. The strength class identification marking consists of two numerals: This ISO Standard represents the basic for a system of nominal dimensions and sizes whereby the catalogje mirrors the calculated values of basic tolerances relating to basic dimensions.
The use of this table is limited to smooth circular gater workpieces or such with two parallel fitting planes or contact areas. The values attribuited to an ISO tolerance grade IT specify the tolerance value and hence the tolerance area.
With ascending numbers, the size of the tolerance increases. For identification purpose of the position of the tolerance area in relation to the nominal dimension zerothe number chosen as tolerance grade IT is preceeded by a letter. Tolerance area H is the most common value for bores. It specifies that the minimum dimension of the bore corresponds to the nominal dimension.
ELESA S.P.A. CON SOCIO UNICO
yanter The permissible maximum dimension corresponds to the nominal dimension plus the IT tolerance. The glue is made up of a liquid plastic and catalouge hardener contained in microcapsules of polymer coated with a red film visible on a part of the thread.
During the screwing operation, the capsules open under the pressure caused by the friction between the two threads. The liquid plastic and the hardener react chemically with one another to lock the thread in position.
ELESA S.P.A. CON SOCIO UNICO – UCIMU-SISTEMI PER PRODURRE
The setting and positioning operations must be completed within a period of about 5 minutes, as the glue will start to set after about minutes. An initial hardening sufficient to fix the thread is reached after about 30 minutes while complete hardening of the fixture will take place over a period cataolgue 24 hours. Reuse after unlocking is not recommended. Threads free of oil and grease guarantee the maximum fixing effect of the glue.
Elements treated with this glue may be stored for a period of up to 4 years, without any deterioration in their properties. Threads with MVK microencapsulated glue are generally used on machines subjected to vibrations, in order to prevent spontaneous unscrewing.
Not suitable for adjusting bolts or screws. This security aspect may be essential for certain catalogke of standard parts. Stock holding of liquid glue is eliminated. To order an article with microencapsulated glue, add the abbreviation MVK to the product description. Spring plunger GN Application of the PFB polyamide-based coating is a process in which the elastic catalgoue polyamide is applied to a part of the thread, to create a locking action while a screw is being tightened.
The play between the screw and the nut screw is filled with polyamide, thus ensuring a high degree of contact between the epesa uncoated threaded surfaces.
The coating contrasts accidental unlocking and accidental unscrewing. The parts locked together may always be separated by applying a minimum unlocking torque. There is no need to wait for it to be activated as the locking action between the threads is instantaneous. Elements threaded with PFB polyamide-based coating may be stored for a virtually unlimited period. High thread locking action.
Excellent for adjusting bolts. This security aspects may be essential for certain applications of standard parts. To order an article with the polyamide-based coating, add the abbreviation PFB to the product description. Glass-fibre reinforced polyamide, glass reinforced polyamide, polyamide-based super-polymers. Glass-fibre reinforced polypropylene or with mineral fillers.
For each of the three samples, the speed of combustion between the two marks does not exceed the standardized speed that depends on the thickness of the samples. For each of the three samples, the flame is extinguished before it reaches the further mark from the point of application of the flame. Sum of times required to extinguish the five samples considering both flame applications specified. Presence of any material dripping from the sample onto the cotton wool beneath it with the risk of igniting it.
If the drilling operation affects not only the metal boss but also a layer of the covering material, the handwheel must be centred carefully and drilling should be started from the plastic side otherwise, chipping may occur when the tool is removed. To be performed in accordance with the instructions given above.
Avoid threading both the metal and the plastic: Drilling or threading operations to be performed entirely in the plastic are exceptional. Strength and surface hardness. Resistance to chemical agents.
Resistance to atmospheric agents and UV rays. Surface Finish and Cleanability. Compliance with International Standards. Types of assembly of elements with threaded inserts. Types of machining process. The main technologies used for the manufacture of plastic products are: This primary process may be followed by secondary operations such as machining, finishing, assembly, decoration to customize the product tampoprintingpackaging to guarantee adequate protection during transportation and identification of the product.
Phenolic based PF thermosetting plastics that harden during moulding due to irreversible polymerization. For an indication of the mechanical strength of components moulded with the plastics listed above,see chapter 4.
Within this temperature range: These values may vary over the working temperature range indicated. A very general indication as to the working temperature range for the various types of plastics is given in the table below: Special, high-resilience polypropylene-based PP technopolymers.
Glass-fibre reinforced polypropylene-based PP technopolymers. Glass-fibre reinforced polyamide-based PA technopolymers. Glass-fibre reinforced polyamide-based PA technopolymers for high temperatures.
Technopolymers are however tougher and have a greater impact strength than Duroplasts. The tables on page A24, A25 and A28 indicate 3 classes of resistance: Some limitations in specific applications. Not recommended for use. As a general rule, chemical resistance decreases as the working temperature and mechanical stresses to which the product is subjected increase. T he universally recognised classification used to describe the reaction of plastics to flames is obtained from two tests defined by UL Underwriters Laboratories, USA.
HB, V2, V1 and V0 with progressively increasing levels of flame resistance. Two marks are present on the samples at standardized distances from the free end. A material may be classified HB if, for each of the three samples, the following conditions are applicable: UL V Vertical Burning The test entails putting a set of five standardised samples of the plastic in a vertical position into contact each one twice for 10 seconds with a flame applied at their bottom free edge.
A sheet of cotton wool is placed underneath the samples. The following parameters are measured: UL Classification of plastics. Time required to extinguish each individual sample after each flame application.