CN108751691A - A kind of multi-panel trimming prism manufacturing technique method - Google Patents
A kind of multi-panel trimming prism manufacturing technique method Download PDFInfo
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- CN108751691A CN108751691A CN201810743611.3A CN201810743611A CN108751691A CN 108751691 A CN108751691 A CN 108751691A CN 201810743611 A CN201810743611 A CN 201810743611A CN 108751691 A CN108751691 A CN 108751691A
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- manufacturing technique
- panel trimming
- technique method
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B33/00—Severing cooled glass
- C03B33/09—Severing cooled glass by thermal shock
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B23/00—Re-forming shaped glass
- C03B23/0013—Re-forming shaped glass by pressing
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B25/00—Annealing glass products
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
Abstract
The invention discloses a kind of multi-panel trimming prism manufacturing technique methods, and method and step is as follows, step 1, carry out machine-cut tie rod to raw material, and carry out thermal cutting using fervent technique and form material block；Step 2, to expecting that the glass surface frosted of block is handled；Step 3, then carry out reconditioning processing；Step 4 is carried out hot-forming by mold；Step 5 is made annealing treatment, and is eliminated or is reduced thermal stress in optical glass to permissible value.Compared with prior art, the present invention solves the unmanageable technical barrier of multi-panel trimming lens optical glass by the improvement of adjustment and die apparatus to conventional process, and product qualified rate reaches 90% or more.
Description
Technical field
The present invention relates to a kind of optical glass manufacturing field more particularly to a kind of multi-panel trimming prism manufacturing technique methods.
Background technology
Multi-panel trimming prism shape of product is abnormal, complex-shaped compared with conventional lens products.Conventional geometry decomposition meter
It is more difficult to calculate small product size, it is difficult to accurately calculate product weight and other technical data.It is needed due to multi-panel trimming prism
Material stock thickness is thicker, and tradition bursts technique glass when implementing and generates because of uneven heating and irregularly burst, and leads to glass not
It can be carried out according to design sawing sheet technique, can not ensure material type.
Traditional production technology is to adjust monolith block using after rolling material.Expect scrap in production process due to rolling, cobblestone,
When diamond dust is with glass hits, is inevitably formed and damaged on frit block surface, it can not be complete in the thinning technique in later stage
It totally disappeared and remove.As the implosion of unrepairable, when subsequent production, will produce the folding more than 0.3.And traditional marverer's skill is
The entirety of product is ground, major part corner angle circular arc equal unobvious when weight is rolled to product weight.Follow-up glass is through excessively high
In warm heating process, because interior molecules warm-up movement aggravates, wrinkle is assembled and easily formed to vertical corner angle and vertical apice punishment.
The critical process of multi-panel trimming prism when die mould produces.Traditional production equipment, mold tooling cannot be satisfied and wanted
It asks.When traditional mode of production multi-panel trimming prism, the single head machine of use produces, less efficient.If being produced using Multi-head machine, due to tradition
Equipment, middle mould outer wall is cylinder, and due to being punching type production, and in the process, middle mould is in rotary state always, but
Upper mold is fixed mode, and traditional die mould pattern can not carry out.And traditional moulds use ductile cast iron material, spheroidal graphite cast-iron
Upper and lower mould sharp corner easily rolls up angle at high temperature, and damage frequency is high.
Invention content
The purpose of the present invention is that providing one kind solves the above problems, and mould is carried out to the optical glass product of shape anomaly
Press the multi-panel trimming prism manufacturing technique method of processing.
To achieve the goals above, the technical solution adopted by the present invention is：A kind of multi-panel trimming prism manufacturing technique method,
Method and step is as follows,
Step 1 carries out machine-cut tie rod to raw material, and carries out thermal cutting using fervent technique and form material block；
Step 2, to expecting that the glass surface frosted of block is handled；
Step 3, then carry out reconditioning processing；
Step 4 is carried out hot-forming by mold；
Step 5 is made annealing treatment, and is eliminated or is reduced thermal stress in optical glass to permissible value.
Preferably, in step 1, before being cut to raw material, charted by three-dimensional software, calculate small product size, determines production
Product weight calculates the length and width and thickness specification of required raw material.
Preferably, in step 1, machine-cut tie rod and thermal cutting are carried out using optical glass multi-cutting machine, utilize height
The Buddha's warrior attendant blade of speed rotation is aided with cooling water system, and carrying out chip to raw material opens item；Optical glass multitool is used again after opening item
Cutting machine carries out fervent technique.
Preferably, in step 2, material block surface frosted processing is carried out by automatic sand-blasting machine.
Preferably, in step 3, egagropilus glass corner angle and beauty defects are ground off by cooling water on floor stand grinder,
And reach the technical process of material block requirement.
Preferably, in step 3, when carrying out ground glass, mill 3-5 blocks are first tried on floor stand grinder, need two are hand-tight to hold glass
Glass is exerted oneself suitably homogenously, is moved left and right, inspection of weighing in time after the completion, confirms stock removal, and progress product is beaten after trying break-in lattice
Mill.
Preferably, in step 4, middle mould outer wall is designed as upright shape, by traditional movable arc-shaped of mold
Clamping plate changes into rectangular clamping plate；Die size is molded at high temperature according to product, and when being cooled to room temperature, product is shunk, i.e., product is received
How much is contracting, and how much is die size increase, with mould length and width dimensions in determination, in being determined according to the height dimension of material block height, lower die
The height of mould.
The Internal periphery of middle mould ensured by wire cutting, the positive and negative 0.01mm of dimensional tolerance, roughness 3.2；Outside middle mould
Overall size ensured by wire cutting, the positive and negative 0.2mm of dimensional tolerance, roughness no requirement (NR).Upper and lower mould outer profile size=
Middle mould Internal periphery size-die clearance, upper mold lower die is processed by wire cutting, and ensures accuracy to size, dimensional tolerance
Positive and negative 0.02mm.
Preferably, mold materials use H13 hot die steels.
Preferably, the upper and lower mould outer profile size of the mold=middle mould Internal periphery size-die clearance, middle mould with it is upper
Die clearance between lower die is controlled in 12C-14C.
Preferably, in step 4, the press apparatus of the mold uses rectilinear stamping equipment, passes through precision 0.02mm
Frame level adjusts the levelness of press apparatus, and vertical collimator adjusts the verticality of compression bar.
Preferably, in step 4, softening process is carried out after hot pressing, using balanced type temperature, i.e. first segment is set as TG
220 ° to 240 ° of temperature, behind reduce by 10 ° or so successively.
Preferably, raw material glass constant batching scope control is within 15 units, annealing rate control -4 degree with
Under.
Compared with the prior art, the advantages of the present invention are as follows：The present invention passes through the adjustment to conventional process, Yi Jimo
The improvement for having equipment, solves the unmanageable technical barrier of multi-panel trimming lens optical glass, product qualified rate reaches 90%
More than.
Description of the drawings
Fig. 1 is the process flow chart of the present invention；
Fig. 2, Fig. 3 are the product schematic diagram of multi-panel trimming lens optical glass to be processed of the invention.
Specific implementation mode
The invention will be further described below.
Embodiment 1：Referring to Fig. 1, Fig. 2, Fig. 3, a kind of multi-panel trimming prism manufacturing technique method, method and step is as follows,
Stock is charted before being cut to raw material by Solidworks three-dimensional softwares, is calculated according to specific product size,
Small product size is calculated, determines that product weight, which improve small product size and calculate accuracy.Joined according to above-mentioned relevant technology
Number, calculates the thickness specification of raw material, and length and width mould size in determines.
Step 1 carries out machine-cut tie rod to raw material, and carries out thermal cutting using fervent technique and form material block；
Machine-cut tie rod and thermal cutting are carried out using optical glass multi-cutting machine, it is auxiliary using high-speed rotating Buddha's warrior attendant blade
With cooling water system, chip is carried out to raw material and opens item；Optical glass multi-cutting machine is used to carry out fervent technique again after opening item,
Material block is formed, fervent technique is to be contacted with high-speed rotating circular steel plate using glass, is made glass office by friction using dry cutting
Portion generates high temperature, by thermal stress severing of glass, it is ensured that glass surface finish improves yield rate.
The product type of optical glass multi-cutting machine：QG300QG300, important technological parameters are as follows：
Because of cutting process pressure, blade is caused to deform, influences product tie rod quality, according to above-mentioned relevant parameter, and
The thickness specification of raw material calculates blade strength, selects associated blade specification.
Step 2, to expecting that the glass surface frosted of block is handled；Material block surface frosted processing is carried out by automatic sand-blasting machine, just
Adhere in releasing agent, protect mold, reduces impurity and generate；Purpose is easy for material block dusting, and blasting treatment reduces conventional rolling material
Technique cobblestone or diamond dust are inevitably resulted in glass hits breaks into point on glass surface, in the thinning technique in later stage
In can not eliminate, avoid the problem that will produce the folding more than 0.3 when subsequent production.
Step 3, then carry out reconditioning processing；
Using first to frit block progress surface frosted processing, then hand grinding processing.Material block surface is prevented in this way
Collision flaw is generated, the problem of corner angle are excessively sharp is also eliminated.On floor stand grinder egagropilus glass is ground off by cooling water
Corner angle and beauty defects, and reach the technical process of material block requirement.
Preferably, when carrying out polishing glass, mill 3-5 blocks are first tried on floor stand grinder, need two are hand-tight to hold glass, suitably
Equably exert oneself, move left and right, inspection of weighing in time after the completion confirms stock removal, prevent from grinding it is small scrap, carried out after trying break-in lattice
Product is polished.
Step 4 is carried out hot-forming by mold；
Middle mould outer wall is designed as upright shape, the traditional movable arc-shaped clamping plate of mold is changed into rectangular folder
Plate；Die size is molded at high temperature according to product, and when being cooled to room temperature, product is shunk, i.e., how much is product contraction, and die size increases
Few (can be determined according to existing experience) is added, with mould length and width dimensions in determination, is determined according to the height dimension of material block height, lower die
The height of middle mould.
The Internal periphery of middle mould ensured by wire cutting, the positive and negative 0.01mm of dimensional tolerance, roughness 3.2；Outside middle mould
Overall size ensured by wire cutting, the positive and negative 0.2mm of dimensional tolerance, roughness no requirement (NR).
The upper and lower mould outer profile size of mold=middle mould Internal periphery size-die clearance, upper mold lower die by wire cutting into
Row processing, and ensure accuracy to size, the positive and negative 0.02mm of dimensional tolerance.
The die clearance of middle mould and upper and lower mould is a quite crucial parameter, and gap is excessive, will produce overlap, and overlap is
The protrusion at molded piece edge, if do not removed, the defects of edge damage is easily caused in transportational process, so that entire product report
It is useless.Gap is too small, and in temperature-rise period, middle mould is shunk mold, and upper and lower mould expansion causes upper and lower mould and middle mould stuck, when serious
Lead to mold and press damage parts.In order to solve above-mentioned clearance issues, according to the expansion of middle mould, upper and lower mould at different temperatures
Size, the clearance control in determining between mould and upper and lower mould is in 12C-14C.
The quality of mold materials determines the presentation quality of product, preferably, inventive die material is made using H13 heat
Mould steel makes, its advantage is that the mold steel high temperature resistant, wear-resistant, resistance to oxidation, intensity are high.Because the product section goes out mold design
There are multiple wedge angles, the upper and lower mould sharp corner of traditional spheroidal graphite cast-iron easily rolls up angle at high temperature, and damage frequency is high.
Control to thickness difference：The press apparatus of the mold uses rectilinear stamping equipment, if equipment is not fallen in up and down
Same level and same vertical plane can cause equipment attrition, to influence product quality, i.e. product thickness is poor in production.For
Verticality, the levelness for ensureing press apparatus, pass through the levelness of frame level (precision 0.02mm) adjusting device, vertical collimator
Adjust the verticality of compression bar.
Softening process：Softening process is carried out after hot pressing, using balanced type temperature, i.e. first segment is set as 220 ° of TG temperature extremely
240 °, behind reduce by 10 ° or so successively.Such technological design ensure that the inside and outside consistency softened of material block.
Step 5 is made annealing treatment, and is eliminated or is reduced thermal stress in optical glass to permissible value.
Annealing is exactly to eliminate or reduce the thermal stress in glass to the heat treatment process of permissible value.Since optical glass is to moving back
Fiery is very stringent, it need to keep glass structure uniform, optical constant reaches certain requirement by annealing.Three mesh of annealing
's：Optical constant reaches requirement, and uniformity eliminates the permanent stress in glass.Optical constant influence factor is mainly raw material
Data batching range, batching range is smaller, and the data consistency fluctuation after tempering is small.Uniformity must be in tempering range
After being kept for the regular hour, i.e., disappear because partly reaching consistent equilibrium state, thus it is similar to the process of stress relieved, but work as light
Glass inhomogeneities is learned after holding stage disappearance, in the temperature-fall period in annealing range, since the heat of glass each section is gone through
History difference causes structure different and regenerates, and the first kind and the second class optical heterogeneity occurs, so must select to fit
When charging mode and holding temperature and rate of temperature fall.Permanent thermal stress is in glass since what is generated there are temperature difference answers
Power, main formative factor have：The coefficient of expansion etc. of temperature gradient, glass.
According to above-mentioned factor, should be noted that when being made annealing treatment：1. the annealing that the selection of raw material is optical glass is closed
Key, for raw material glass constant batching scope control within 15 units, annealing rate control is such as the following in -4 degree.2. control annealing
The uniform type of the thermal field of furnace annealing, each space temperature variation etc..3. controlling warming temperature and time ratio control, it is ensured that glass is not burst,
The control of holding temperature and time, it is ensured that glass data balances.4. the characteristics of cooling down by the determination in the section that cools down and at a slow speed etc., really
Protect product quality.
Exhaustive presentation is carried out to a kind of multi-panel trimming prism manufacturing technique method provided by the present invention above, herein
Applying specific case, principle and implementation of the present invention are described, and the explanation of above example is only intended to help
Understand the method and its core concept of the present invention；Meanwhile for those of ordinary skill in the art, according to the thought of the present invention,
There will be changes in the specific implementation manner and application range, to the present invention change and improvement will be it is possible, without
The conception and scope that accessory claim defined can be exceeded, in conclusion the content of the present specification should not be construed as to the present invention
Limitation.
Claims (10)
1. a kind of multi-panel trimming prism manufacturing technique method, it is characterised in that：Method and step is as follows,
Step 1 carries out machine-cut tie rod to raw material, and carries out thermal cutting using fervent technique and form material block；
Step 2, to expecting that the glass surface frosted of block is handled；
Step 3, then carry out reconditioning processing；
Step 4 is carried out hot-forming by mold；
Step 5 is made annealing treatment, and is eliminated or is reduced thermal stress in optical glass to permissible value.
2. a kind of multi-panel trimming prism manufacturing technique method according to claim 1, it is characterised in that：It is right in step 1
Raw material cutting before, charted by three-dimensional software, calculate small product size, determine product weight, calculate required raw material length,
Wide and thickness specification.
3. a kind of multi-panel trimming prism manufacturing technique method according to claim 1, it is characterised in that：In step 1, adopt
Machine-cut tie rod and thermal cutting are carried out with optical glass multi-cutting machine, is aided with cooling water system using high-speed rotating Buddha's warrior attendant blade
System carries out chip to raw material and opens item；Optical glass multi-cutting machine is used to carry out fervent technique again after opening item.
4. a kind of multi-panel trimming prism manufacturing technique method according to claim 1, it is characterised in that：In step 2, lead to
It crosses automatic sand-blasting machine and carries out material block surface frosted processing.
5. a kind of multi-panel trimming prism manufacturing technique method according to claim 1, it is characterised in that：In step 3,
Egagropilus glass corner angle and beauty defects are ground off by cooling water on floor stand grinder, and reach the technical process of material block requirement.
6. a kind of multi-panel trimming prism manufacturing technique method according to claim 1, it is characterised in that：It, will in step 4
Middle mould outer wall is designed as upright shape, and the traditional movable arc-shaped clamping plate of mold is changed into rectangular clamping plate；Die size
It is molded at high temperature according to product, when being cooled to room temperature, product is shunk, i.e., how much is product contraction, and how much is die size increase, with true
Mould length and width dimensions in fixed, the height of mould in being determined according to the height dimension of material block height, lower die.
7. a kind of multi-panel trimming prism manufacturing technique method according to claim 6, it is characterised in that：The mold it is upper
Lower die outer profile size=middle mould Internal periphery size-die clearance, the die clearance between middle mould and upper and lower mould are controlled in 12C-
14C。
8. a kind of multi-panel trimming prism manufacturing technique method according to claim 1, it is characterised in that：In step 4, institute
The press apparatus for stating mold uses rectilinear stamping equipment, and the level of press apparatus is adjusted by precision 0.02mm frame levels
Degree, vertical collimator adjust the verticality of compression bar.
9. a kind of multi-panel trimming prism manufacturing technique method according to claim 1, it is characterised in that：In step 4, heat
Softening process is carried out after pressure, using balanced type temperature, i.e. first segment is set as 220 ° to 240 ° of TG temperature, behind reduce successively
10 ° or so.
10. a kind of multi-panel trimming prism manufacturing technique method according to claim 1, it is characterised in that：It is former in step 5
Material glass constant batching scope control is within 15 units, and annealing rate control is below -4 degree.
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| CN201810743611.3A CN108751691B (en) | 2018-07-09 | 2018-07-09 | Production process method of multi-face trimming prism |
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| CN201810743611.3A CN108751691B (en) | 2018-07-09 | 2018-07-09 | Production process method of multi-face trimming prism |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110228951A (en) * | 2019-06-10 | 2019-09-13 | 成都恒达光学有限公司 | A kind of sulphur system glasses for infrared use secondary press technique |
| CN111606704A (en) * | 2020-06-03 | 2020-09-01 | 福建阿石创新材料股份有限公司 | ITO evaporation material and preparation method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203653417U (en) * | 2014-01-20 | 2014-06-18 | 成都恒达光学有限公司 | Pentaprism mold |
| CN103936274A (en) * | 2014-03-13 | 2014-07-23 | 深圳市宏康大伟科技有限公司 | Processing method of glass eyeglass of camera |
| CN103951165A (en) * | 2014-05-14 | 2014-07-30 | 成都恒达光学有限公司 | Intelligent compression molding equipment for glass optical lens production |
| CN204675993U (en) * | 2015-05-08 | 2015-09-30 | 和县煜熠光学仪器科技有限公司 | A kind of opticglass cutting tool device |
| CN106291787A (en) * | 2016-08-31 | 2017-01-04 | 成都恒达光学有限公司 | A kind of prism processing technique |
| CN207273674U (en) * | 2017-08-18 | 2018-04-27 | 成都恒达光学有限公司 | Optical mirror slip die mould head |
-
2018
- 2018-07-09 CN CN201810743611.3A patent/CN108751691B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203653417U (en) * | 2014-01-20 | 2014-06-18 | 成都恒达光学有限公司 | Pentaprism mold |
| CN103936274A (en) * | 2014-03-13 | 2014-07-23 | 深圳市宏康大伟科技有限公司 | Processing method of glass eyeglass of camera |
| CN103951165A (en) * | 2014-05-14 | 2014-07-30 | 成都恒达光学有限公司 | Intelligent compression molding equipment for glass optical lens production |
| CN204675993U (en) * | 2015-05-08 | 2015-09-30 | 和县煜熠光学仪器科技有限公司 | A kind of opticglass cutting tool device |
| CN106291787A (en) * | 2016-08-31 | 2017-01-04 | 成都恒达光学有限公司 | A kind of prism processing technique |
| CN207273674U (en) * | 2017-08-18 | 2018-04-27 | 成都恒达光学有限公司 | Optical mirror slip die mould head |
Non-Patent Citations (1)
| Title |
|---|
| 王福川等: "《现代建筑装修材料及其施工》", 30 December 1992, 中国建筑工业出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110228951A (en) * | 2019-06-10 | 2019-09-13 | 成都恒达光学有限公司 | A kind of sulphur system glasses for infrared use secondary press technique |
| CN110228951B (en) * | 2019-06-10 | 2023-07-25 | 成都恒达光学有限公司 | Sulfur infrared optical glass secondary pressing process |
| CN111606704A (en) * | 2020-06-03 | 2020-09-01 | 福建阿石创新材料股份有限公司 | ITO evaporation material and preparation method thereof |
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| CN108751691B (en) | 2021-10-26 |
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