RU2190537C2 - Amber product manufacture method - Google Patents

Abstract

FIELD: production of amber articles. SUBSTANCE: method involves feeding raw amber material and filling working cavities of mold by sucking raw amber material through mold vacuumization. EFFECT: increased efficiency and improved quality of articles. 2 cl, 1 dwg

Description

 The invention relates to the production of decorative amber products, but can be used in the production of technical and other products from amber.

A known method of producing amber products from amber of a pulverulent fraction (amber flour) by injection molding at a temperature of 180-220 ^o With a specific pressing pressure of 60-80 kgf / cm ² and exposure time under pressure of 1-3 minutes (copyright 1479482, C 09 F 1/04, publ. 05/15/89, BI 18).

The disadvantage of this method, limiting the scope of its application, is the need to use increased (60-80 kgf / cm ² ) specific pressures for forced extrusion in the working mold of a viscous amber mass resulting from the heating of amber flour, which is especially typical for thin-walled products complex shape. In this case, thin mold cavities have high hydraulic resistance when filled with an amber mass.

 In turn, this requires the use of press equipment with increased power, which complicates and increases the cost of production.

 The task to which the proposed technical solution is directed is to simplify the process of obtaining amber products and reduce the cost of production.

 To solve this problem, it is proposed to supply amber to the mold and fill it with its working cavities by suction of pulverized amber into the working cavities of the mold by evacuating it.

 The proposed technical solution is illustrated by graphic material with an image of a laboratory installation, on which experimental work was carried out to implement the proposed method.

The following notation is accepted:
1 - gas permeable shell;
2 - the working cavity of the form;
3 - pressure gauge;
4 - mold matrix;
5 - plate;
6 - vacuum gauge;
7, 13 - valves;
8 - pipe;
9 - amber flour;
10 - rack;
11 - pipeline for supplying compressed gas;
12 - a casing;
14 - receiver;
15- vacuum pump;
16 - container.

 The method is as follows (see the attached drawing).

 A mold consisting of a matrix 4 with a pipe 8 mounted in it and a gas-permeable shell 1 made of fiberglass was fixed on a plate 5 mounted on racks 10.

 The end of the pipe 8 was lowered into the lower part of the container 16, filled with amber flour.

 Then, a removable casing 12 was installed on the plate 5, having tubes 11 and 17 for connection to a compressed gas (nitrogen) supply system and to a vacuum pump.

 The casing, mounted on gaskets made of vacuum rubber, was sealed, pressing against the surface of the base plate 5 with bolts.

 After that, tube 11 was connected to a compressed nitrogen supply system, and tube 17 was connected to a vacuum system including a DVN16D15 vacuum pump, receiver 14, and vacuum gauge 6.

With the valve 13 closed and valve 4 open, the vacuum pump 15 was turned on and, using the receiver 14 and the pipe 17, air was pumped out from the cavity of the casing 12 and the working cavity 2 of the mold until they reached a vacuum of 10 ^-3 -10 ^-4 MPa, the value of which controlled using a vacuum gauge 6.

 During the evacuation process, the dusty amber located in the container 16 rushes along the pipe 8 in the direction indicated by the arrows (similar to the operation of a vacuum cleaner) and sequentially fills the working cavity 2 of the mold.

Without removing the vacuum, the heating elements (not shown) placed inside the casing were turned on and the mold filled with amber was heated to (210 ± 10) ^o С, after which it was held for 3 minutes.

 At the same time, amber flour softened and the product was formed.

After the exposure, the vacuum pump was turned off, valve 7 was closed and valve 13 was opened, providing the injection cavity 2 of the mold filled with amber, compressed nitrogen under a pressure of 20 kgf / cm ² (20 • 10 ⁵ Pa), the value of which was controlled using pressure gauge 3.

 Without turning off the electric heaters, they were held under pressure of compressed gas for 5 minutes, after which the valve 13 was closed, the cavity of the casing 12 was connected to the atmosphere and removed from the plate 5, the mold was disassembled and the molded product was removed.

Compared with the method adopted for the prototype, the proposed method allows you to form amber products with significantly lower specific pressures on the processed material (20 kgf / cm ² instead of 60-80 kgf / cm ² ) and ensures filling of narrow and thin cavities of the mold with significantly lower energy costs.

 Thus, the application of the proposed method greatly simplifies and reduces the cost of production of amber products.

Claims (1)

A method of producing amber products from amber of a pulverulent fraction, comprising supplying amber raw materials to the mold, filling the working cavities of the mold with raw materials, forming the product at 180-220 ^{° C.} without air access, holding at this temperature and cooling, characterized in that the supply amber raw materials and filling the working cavities of the mold is carried out by suction of amber raw materials by evacuating the mold.