CN1124187C - Method for producing plastic optic full reflector mould - Google Patents

Abstract

The present invention provides a method for manufacturing a plastic full optical reflector mould, which comprises the following steps: splicing pins are manufactured from a metal rod material; a regular pyramid of which the three edges are mutually in 90 degrees is formed by rough processing the end head of a workblank; three side planes of the regular pyramid at the end part of the splicing pins are finely processed by a milling cutter; the angle precision and the surface roughness of the regular pyramid reach technical requirements by grinding and polishing the regular pyramid. The splicing pins are densely arranged to form a continuous and regular array mould core. The array mould core is used as a negative electrode to manufacture a concave mould cavity of the mould with an electrocasting method. The mould cavity is assembled on a mould frame to form the mould.

Description

The manufacture method of mould of plastic optical full reflector

A kind of manufacture method of mould for plastics, the particularly manufacture method of plastic optics reflector mould.

Plastic optic full reflector is made with transparent plastic, a kind of optics that incident light can be reflected with the minimum angle of divergence along original optical path.Be mainly used in various road safety markers.The reflecting effect of reflector depends on angle precision and surface roughness between the flatness, face of the triangular conical surface.Mould is crucial.The inventor's the patent No. once provided in for 93102754.3 same title patent of invention a kind of processing easy, reach specification requirement easily.The method of the manufacturing mould of plastic optical full reflector that cost is low.Being characterized as of the procedure of processing of this method:

(1) monomer is made the assembly pin of band pyramid head, and the processing of wherein said assembly needle end part pyramid adopts the diamond cutter machining to improve machining accuracy.

(2) monomer that makes is pieced together the pin solid matter and form the array punch.

(3) copy the concave die cavity of mould with described punch.

(4) described concave die cavity is installed on the mould bases to constitute mould.

Said method finds to exist following deficiency through using:

1, with diamond cutter machining on the lower material of hardness, its surface roughness is not as good as grinding and polishing method height;

2, carefully rigidity is poor owing to piece together pin, and the extension in anchor clamps is short, often hits the cutter accident, and the result is the diamond cutter damage, once hits about 5000 yuan of cutter losses.

The objective of the invention is to propose a kind of higher-quality processing method at the deficiency of above-mentioned technology.

Above-mentioned purpose of the present invention is realized by following technical scheme.

A kind of method of making mould of plastic optical full reflector, its procedure of processing is:

(1) the assembly pin that the pin monomer is made the band triangular pyramid is pieced together in processing; (2) the assembly array punch is pieced together the pin solid matter with the monomer that makes and is formed the array punch; (3) die copies mould with this punch concave die cavity is duplicated in electroforming; (4) assembling is contained on the mould bases described concave die cavity to constitute mould;

It is characterized in that;

In the step 1, the processing method of piecing together pin is: first roughing blank termination makes and is three ribs, 90 ° orthopyramid each other, piece together three side planes of needle end part pyramid again with milling cutter fine finishining, grinding and polishing makes the angle precision of pyramid, surface roughness reach specification requirement again.

Piece together needle material and can be steel, copper material, stainless steel etc.

Advantage of the present invention is:

1, overcome abroad the difficulty of processing of piecing together the triangular pyramid die that pins constitute by three, kept adopting and pieced together pin by one and copy the advantage that die easily guarantees positive triangular pyramid required precision as punch.

2, because the finishing operation of assembly pin processing is a grinding and polishing, surface roughness can reach higher standard.

3,, greatly reduce the cost of charp tool without diamond cutter.

The invention will be further described below in conjunction with drawings and Examples:

Description of drawings:

Fig. 1 is a flow process chart of the present invention.

Press Fig. 1 work flow:

1, processing assembly pin assembly pin blank material is regular hexagon or equilateral triangle bar, material is to be carbon steel, also can be that copper and copper alloy, aluminium and aluminium alloy, stainless steel or other are easy to machining and polishing and can be as the metal or the macromolecular material of electroforming cathode material in other embodiments.End face and axis normal are blocked and guaranteed to length on demand on lathe.

Rough mill the handful material blank that to be intercepted and be contained in the anchor clamps, mill the conical surface of processing end triangular pyramid.

Finish-milling is contained in rough machined assembly pin in the jig of the accurate anglec of rotation (as the precision indexing head), on precision machine tool, the triangular pyramid of piecing together needle end part is carried out fine finishining with milling cutter, on special equipment, carry out grinding and polishing again and make surperficial tailor-tacking degree＜0.2 μ m, detect every error in length＜0.02mm according to pin with dried submeter.

2, the assembly array punch assembly pin solid matter that will process is formed continuous, well-regulated triangular pyramid array punch, is fixedly clamped.

3, electroforming is duplicated the punch that die will be fixedly clamped and is placed nickel plating bath to carry out electroforming as negative electrode.The nickel metal is deposited on convex mould surface in the electroforming process, takes out when deposit thickness reaches 10 millimeter, sloughs punch, promptly gets the concave die cavity that duplicates.

4, assembling is contained on the mould bases described concave die cavity to constitute mould.

The reflective light intensity coefficient CIL of the plastic optic full reflector that the mold injection made from method of the present invention is shaped--caution sign row reflector reach with surpass state ministry of public security standard GA-184-1999 in the regulation of relevant 8 (cd/lx), up to 39.1 (cd/lx), reach the most advanced level in the world.

Claims (2)

1, a kind of method of making mould of plastic optical full reflector, its procedure of processing is:

(1) the assembly pin that the pin monomer is made the band triangular pyramid is pieced together in processing; (2) the assembly array punch is pieced together the pin solid matter with the monomer that makes and is formed the array punch; (3) die copies mould with this punch concave die cavity is duplicated in electroforming; (4) assembling is contained on the mould bases described concave die cavity to constitute mould;

It is characterized in that:

In the step 1, the processing method of piecing together pin is: first roughing blank termination makes and is three ribs, 90 ° orthopyramid each other, piece together three side planes of needle end part pyramid again with milling cutter fine finishining, grinding and polishing makes the angle precision of pyramid, surface roughness reach specification requirement again.

2, according to the method for the described manufacturing mould of plastic optical full reflector of claim 1, it is characterized in that: piece together needle material and can be steel, copper material, stainless steel.