Manufacturing method of forming mould for door/window curtain wall sealing strip

Abstract

The invention discloses a manufacturing method of forming mould for door / window curtain wall sealing strip, which comprises the steps of: implementing flow analysis on a mould and modifying a linear cutting blueprint; according to the modified linear cutting blueprint, axially cutting a mould cavity, a mould core and a mould core sleeve inside a cylinder; uniformly polishing the linearly cut mould cavity and mould core; forming an inner concave face on the periphery of the small polished mould cavity by grinding; punching, on an intrusion end face, an axial ventilation hole connected with a ventilation pipe; welding the ventilation pipe and a ventilation branch of the ventilation hole and a mould core hole to achieve communication therebetween; mounting a radial stopping bar at the position, with large diameter of opening, of the mould cavity on the intrusion end face; and measuring dimensional tolerance of extrusion product by means of mould tryout, and correctively grinding the inner concave face or adjusting the stopping bar in accordance with the measuring result. By means of the flow analysis on the mould, ventilated extrusion of the mould and the mould core, sample measurement, grinding of the inner concave face at the opening of the small mould cavity and decrease and increase of the width of the stopping bar at the opening of the mould cavity, extrusion flow uniformization of the mould cavity is implemented so that ethylene propylene diene rubber sealing strip flows stably at high temperature, thereby raising the qualified rate of extrusion product, achieving double-mould cavity extrusion and enhancing production efficiency.

Description

technical field [0001] The invention relates to a manufacturing method of an extrusion die, in particular to a manufacturing method of an extrusion die for processing door, window and curtain wall sealing strips. Background technique [0002] With the development of aluminum alloy profiles, the door and window curtain wall sealing strip highlights its development potential and direction. The traditional sealing strip is made of low-priced modified PVC as the extruded material and is gradually replaced by vulcanized EPDM rubber ( EPDM), due to the high elasticity of vulcanized EPDM rubber and the variety of shapes of the sealing strip, it is required that the extrusion flow of the extrusion die should be uniform to ensure the consistency of the product shape and size; the precision of the extrusion die processed by the traditional welding method Low, the extrusion flow rate changes greatly, the qualified rate of the extruded vulcanized EPDM sealing strip is low, and only one ...

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Problems solved by technology

[0003] In view of the above existing problems, the present invention proposes a manufacturing method of a door, window and curtain wall sealing strip forming mold that can solve the problem of extrusion flow uniformity

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