CN1041564C

CN1041564C - Method for production of glass bent mirror and special shaping device

Info

Publication number: CN1041564C
Application number: CN93121053A
Authority: CN
Inventors: 胡彭鸿; 陈凡华; 张旭; 慕汉文
Original assignee: OPTICAL INSTRUMENT COMBINATION INST ZHEJIANG UNIV HANGZHOU CITY
Current assignee: OPTICAL INSTRUMENT COMBINATION INST ZHEJIANG UNIV HANGZHOU CITY
Priority date: 1993-12-24
Filing date: 1993-12-24
Publication date: 1999-01-06
Anticipated expiration: 2013-12-24
Also published as: CN1104337A

Abstract

The present invention relates to a method for producing a glass mirror with a curved surface and a special molding device thereof. A plurality of glass blanks (3) through clean processing are placed on a formwork (15); the glass blanks (3) are gradually heated together to near a softening point; a motor (7) is started to enable the glass blanks (3) to vibrate or impact, so the glass blanks (3) are accelerated to be tightly attached to the formwork (15) to form molds; next, the molds are uniformly cooled in a heat preservation period; finally, molds are processed by cutting shaping, film plating on a convex surface, checking and packing. Accordingly, the present invention has the characteristics of convenient process and equipment, high production efficiency, high quality of optical imaging, high precision, etc. Thereby, the method of the present invention is particularly suitable for the manufacture of a wide-angle rearview mirror with a curved surface, large curvature and high precision for an automobile.

Description

The production method of glass bent mirror and special shaping device thereof

The present invention relates to a kind of production method and special-purpose shaped device thereof of glass bent mirror, particularly relate to the glass ware forming of a kind of deep camber, high precision curved mirror.

The tempered glass of moulding is widely used as the interior outside rear-view mirror in automobile and so on vehicles, in order to satisfy its strict optical imaging requirement, normally adopt following technological process: glass plate is along the delivery pathways that roughly is level, it is heated to its deformation temperature gradually by the tunnel type kiln, then at pressurized between the anvil swage on a pair of vertical alignment, and at its formpiston side employing vacuum hold device, making, the glass plate of thermal softening further coincide with mould; Release vacuum again, glass plate falls, and delivering to cooling section by conveying device, to carry out speed cold.Owing to reasons such as the force direction that exists pull of vacuum and deadweight to sink are opposite, make the optical imaging performance of its strict molded surface be difficult to obtain assurance.In addition, the someone adopts that plate glass press is directly used, the counterdie vertical movement, to realize the technology of glass plate to bend (number of patent application 87101950A), also has the problems referred to above equally.

Disclosed a kind of shaping glass sheets equipment that is used for suppressing double-deck bending glass in No. 4,290,796, the United States Patent (USP) of Reese etc.Supporting glass plate with bending iron,, making glass plate borrow curved the hanging down of deadweight and preformed along with bending iron is delivered to the annealing kiln of heating, this kind method and apparatus, though simpler, the optical quality of bend glass moulding is not high.

People such as Robert then disclose a kind of glass of thermal softening that will be subjected to the reciprocal transveyer of vacuum type in the patent of " pressing bend method of sheet material and equipment " (application number 87105973A) of China application and have delivered to profiled section from adding heating kiln, be placed at this glass plate on the vacuum mold of bottom, make pull of vacuum consistent, to improve its moulding optical quality with the gravity direction of nature.But its product is when being used as high-precision bend glass minute surface, and it is not enough that its quality of optical imaging etc. is still owed, and only limit to production cylindrical curved surface product usually.

The purpose of this invention is to provide and a kind ofly be used to make high quality of optical imaging, and production efficiency is higher, the production method of the glass bent mirror that operation and equipment are comparatively easy.

Another object of the present invention provides a kind of special shaping device of glass bent mirror.

The production method of glass bent mirror provided by the present invention, mainly be after performing the conventional preliminary works such as cleaning that comprise glass blank and mould, adopt following key step: a, the several piece glass blank is folded neat, be positioned on the one-side mould, it is heated gradually; B, when described glass blank temperature rise during to glass softening point ± 40 ℃, the glass that is softened is clashed into or is vibrated with mould, fit tightly in mould and moulding until it; C, bend glass is moved to heat preservation zone with mould mould and bend glass are cooled off gradually, the internal stress that is produced during with its deformation of abundant elimination; The relatively poor position of imaging around d, the cutting bend glass; Because its outer peripheral areas deformation is bigger, imaging is relatively poor; E, bend glass convex surface plated film.Cut off the inaccurate part of peripheral imaging, lens edge part image quality is significantly improved.

The inventor is on the basis of repeatedly practising, testing, and research draws a series of suitable technical parameters.For example: the total folded thick m δ of the glass blank of each moulding and moulding radius of curvature R than m δ/R≤1.5%, to guarantee that bend glass under the prerequisite of enough quality of optical imaging, suitably improves work efficiency; The frequency that softening back glass is impacted with mould is 5-20 time/minute, and amplitude continues collision time less than 1.0 minutes less than 1.5cm; Temperature retention time was greater than 60 minutes.Wherein, preferred value is: m δ/R=0.1-1%; The frequency of bump is 10-15 time/minute, and amplitude is 1.0cm, and the time is 0.5-1.0 minute.

Glass blank of the present invention can adopt ordinary plate glass, float glass etc.; The mode of heating also can adopt hot room intermittently to produce except that the tunnel that adopts continous way, and the latter's heat preservation zone is then can be at the holding furnace that exists together cold etc.; Described plated film plates one deck chromium with the convex side that detects qualified bend glass especially or stainless steel is advisable.

Below by embodiment the present invention is further described:

Fig. 1 is heating furnace heating zone, a kind of tunnel of a present invention cross section structure synoptic diagram.

Fig. 2 is a kind of synoptic diagram that clashes into gear train among the present invention.

Fig. 3 is a kind of tunnel of the present invention heating furnace floor map.

Fig. 4 is a kind of concrete heating temperature curve synoptic diagram of the present invention.

Accompanying drawing 1 and accompanying drawing 2 are structural representations of implementing a kind of tunnel type special shaping device of the present invention.Controlled motor (7) is through speed reduction unit (6), drive is by fixing two transmission shafts (8) of bearing seat (13), by 12 times/minute rotations, two pairs of cams of coaxial drive (14), on bottom surface by castiron bend glass forming panel (15), be fixed with two inverted vee way acceptors (5), and by guide rail corresponding with it (9) supporting and location.Guide rail (9) then is fixed on the basic body (11) of tunnel type body of heater through the base (10) that materials such as cast iron are made; Described body of heater (2) is by the magnesia sintering, covers the asbestos heat-insulation layer outward and constitutes; And in body of heater, be provided with the electric heating heating source.

Concrete production method is mainly as follows: one, preliminary work: cut required foliated glass blank (3) by the specification of glass bent mirror, the requirement of shape, clean with the alcohol ether on the surface; Check the temperature control device, and energising heats up body of heater; Detent mechanism, bump vibrating mechanism etc. is checked; Arrangement, appropriate template (15) surface of arrangement are cleaned.Two, get five of the thick glass blanks of 2mm, folded being placed on together on the clean cast iron template, again the guide rail acceptor (5) under the template (15) is aimed at and be placed on the track made from angle bar (9), buckle driving-chain (4) and start the dragging motor (not shown), template (15) was slowly advanced under its affecting, and (I) slowly evenly intensification in the preheating zone, prevent the different generation explosions of glass with the template programming rate.After about 60 minutes of heating-up time, template enters high hot-zone (II) and touches position transducer at preposition, makes the dragging motor stall, and parts such as template are stuck in the high-temperature region heats.(actual temp is different and different according to the specification of glass and kind near softening point when processed glass blank temperature rise, float glass for example, heat to 800 ℃ ± 50 ℃) automatic or manual control motor (7) makes its startup, drive two pairs of cams (14) through reduction gear (6) and gear pair (16), make the guide rail acceptor (5) on it, template (15) and the glass blank (3) that just has been softened vibrate together, and impinge upon on fastening guide rail (9) and the base (10) thereof, amplitude is 0.8cm, frequently it is 12 times/minute, thickness of glass is 2mm, folded sheet number is 5, and radius of curvature R is 150mm, i.e. m δ/R=0.53%; Make softening glass under deadweight and impact double action, (as 40 seconds) crooked deformation more quickly is close to mould and is formed.Behind the failure of oscillation, restart dragging motor, template (15) etc. is transferred to heat preservation zone (III), stop about 80 minutes of insulation, stop slightly in the fire door exit then in this district, when workpiece temperature is reduced to 200 ℃ of left and right sides, the air cooling of coming out of the stove again.Like this can be fully, cooling gradually equably, eliminate the internal stress in the bend glass effectively, thereby avoided may producing of errors such as thermal spalling.

Then, excise by the periphery of the dimensional requirement of the eyeglass bend glass after with moulding again; Adopt existing coating machine to plate chromium or stainless steel rete at convex side then, after product inspection was qualified, packing was high precision, high-quality spherical mirror product.

Since the present invention utilize dexterously with gravity in the same way and much larger than its vibration force or impact, act on the softening glass blank, make it more promptly be close to natural single face moulding above the mould; Thereby reduced effectively because of heat time heating time long, glass blank surface produces defectives such as pit, bubble; Simultaneously, the present invention also can utilize the folded thick m δ of the bend glass of being processed much smaller than radius-of-curvature on this basis, and the less variation of the radius of its curvature not too influences the crudy of its glass bent mirror again, more audaciously several pieces glass are stacked moulding simultaneously, to improve working (machining) efficiency.

In addition, the present invention also increases in production technology into the peripheral operation partly of cutting bend glass mirror, make glass blank when softening, vibrating or clashing into, be subjected to bigger bending, distortion moment, especially under the effects such as tension force that its deformation produced, make the glass ware forming quality of drawing better in the middle part.

The high precision curved surface of Sheng Chaning (especially sphere) glass mirror thus guarantees distortion rate＜3.0% at whole minute surface center and edge.

Claims

1, a kind of production method of glass bent mirror comprises that the cleaning of glass blank and mould is prepared, and it is characterized in that:

A, several piece glass blank (3) is folded neat is positioned on the mounted split pattern (15), and it is heated gradually;

B, when described glass blank (3) temperature rise during to glass softening point ± 40 ℃, it is clashed into or is vibrated with template (15), to fitting tightly and moulding in template;

C, bend glass is moved to heat preservation zone with mould, mould and bend glass are cooled off gradually;

The relatively poor position of moulding around d, the cutting bend glass;

E, bend glass convex surface plated film.

2, the production method of a kind of glass bent mirror as claimed in claim 1, the total folded thick m δ that it is characterized in that described glass blank (3) and the radius of curvature R of moulding than m δ/R≤1.5%; Softening back glass is 5-20 time/minute with the frequency that is impacted, and amplitude is less than 1.5cm, and the duration was less than 1 minute.

3, the production method of glass bent mirror as claimed in claim 2, the total folded thick m δ that it is characterized in that described glass blank and moulding radius of curvature R than m δ/R=0.1-1.0%, the frequency of bump is 10-15 time/minute, and amplitude is 0.5-1.0cm, collision time 0.5-1.0 minute.

4,, it is characterized in that the convex side of the bend glass after moulding is coated with one deck chromium or stainless steel rete as the production method of the described a kind of glass bent mirror of claim 1 to 3.

5, a kind of special shaping device of glass bent mirror by thermal insulation furnace body (2) heat thermal source, temperature controller and place the forming panel in the body of heater to constitute, is characterized in that having in described template (15) a pair of or several to vibration cam (14); Be equipped with the processed glass blank of one or a few blocks (3) on the template (15).

6, the special shaping device of glass bent mirror as claimed in claim 5 is characterized in that having two guide rail acceptors (5) in described template (15), and it has corresponding guide rail body (9); Processed glass blank (3) that pumps and template (15) impinge upon on the guide rail (9) together with guide rail acceptor (5), quicken glass ware forming.