EP0986447A1 - Method for producing an elongated single-piece structural part for spectacles - Google Patents
Method for producing an elongated single-piece structural part for spectaclesInfo
- Publication number
- EP0986447A1 EP0986447A1 EP98924238A EP98924238A EP0986447A1 EP 0986447 A1 EP0986447 A1 EP 0986447A1 EP 98924238 A EP98924238 A EP 98924238A EP 98924238 A EP98924238 A EP 98924238A EP 0986447 A1 EP0986447 A1 EP 0986447A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- section
- shape
- housing
- component
- powder injection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/16—Both compacting and sintering in successive or repeated steps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
-
- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C5/00—Constructions of non-optical parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
Definitions
- the invention relates to a method for producing an elongated, one-piece component for glasses.
- spectacle parts such as one-piece spectacle arms with a spring hinge housing
- a wire This is cut to length at the start of machining and then reduced to different diameters.
- a longitudinal section of the wire is then embossed and / or formed, for example to form the. Get geometry of the case.
- at least one longitudinal section of the wire is machined, for example the cutting off of embossed or formed protruding areas, the introduction of a hole, etc.
- PIM process powder injection molding process
- a suitable metal powder is preferably heated with a powdered binder, similar to a plastic injection molding process, and introduced under pressure into a mold, the contour of which corresponds to the contour of the part to be produced.
- the first preform obtained in this way is heated to produce a second preform, as a result of which the binder is driven out of the first preform.
- the second preform is then sintered in a conventional sintering furnace.
- This method has the disadvantage that certain geometric shapes cannot be produced. These include in particular elongated parts with a very small diameter. Here the powder cannot be sprayed into the appropriate form. Furthermore, the desired tolerances due to debinding and sintering can no longer be met.
- the object of the present invention is therefore to provide a method which enables simple and inexpensive production of one-piece components, for example spectacle parts, without machining.
- the method according to the invention for producing a one-piece component, preferably for glasses len, which has a first section with a first geometric shape and a second section with a second geometric shape provides that the component is produced by means of a PIM process, preferably a MIM process, the first section already having its final shape has, while the second section is designed as a preferably cylindrical section.
- This second section is then shaped into the desired shape in the next working step, preferably first reduced to the desired length and then embossed and / or shaped into its final shape.
- the method according to the invention thus comprises two working steps, namely injection molding, debinding and sintering, and then the shaping, preferably first the reduction and then the embossing / shaping. Machining steps are therefore not necessary; cutting the component to length is also eliminated. This results in a considerable reduction in costs, since in the previous manufacturing processes the machining process is usually 30% to 50% of the total costs.
- the invention is based on the surprising finding that the sintered parts described as brittle, hard and not reworkable can nevertheless be reworked, in particular stamped and shaped.
- the method is particularly advantageous if the second section has a geometric shape. points that can not be produced using the PIM process. This applies in particular to temple pieces that have an elongated shape with a small diameter.
- the method for producing a one-piece temple piece with a spring hinge housing can be used particularly advantageously.
- the first section with a complicated geometric shape forms the spring hinge housing and the second section with a simple geometric shape forms the temple piece.
- the second section is preferably brought to the desired length in several work steps by reducing the diameter, the reduction preferably being carried out by hammering machining.
- part of the second section is preferably embossed into a rectangular cross-sectional shape.
- titanium, stainless steel, nickel silver or a nickel-free metal alloy is particularly advantageous for the production of the component.
- An eyeglass part namely an eyeglass temple
- the invention is not limited to parts of glasses, but is generally applicable to one-piece components. Show:
- Figure 1 is a schematic representation of a one-piece temple with spring hinge housing
- FIGS. 1-10 show schematic representations of the glasses bracket 2a to c gel in different processing stages to explain the method according to the invention.
- FIG. 1 shows a schematic representation of a temple 1, which comprises a spring hinge housing 3 and a bracket section 5.
- the spring hinge housing 3 (hereinafter referred to as housing) and the bracket section 5 are made in one piece from titanium or, for example, a nickel-free metal alloy.
- the housing 3 has a recess 7, which has an opening 9 to the end of the temple 1 facing away from the temple section 5.
- the recess 7 serves to receive a spring mechanism (not shown), which is a necessary component of a spring hinge.
- the recess 7 has a circular or a rectangular cross section.
- the recess 7 is delimited by side walls 11, the lower and upper side walls 11.1 and 11.2 being arranged parallel to one another, while the side walls 11.3 and 11.4 and the side wall 11.5 run obliquely to one another (as can be seen in the plan view according to FIG. 1).
- the Side walls 11.3 to 11.5 also run obliquely to the side wall 11.1 forming the bottom of the housing.
- FIG. 1 further shows that the upper side wall 11.2 merges towards the end of the temple 1 into a section 13 which has a conically increasing wall thickness. Furthermore, this section 13 is U-shaped in plan view, so that a hinge eye can be accommodated between the two legs 15.
- the lower side wall 11.1 projects beyond the end of section 13 of the side wall 11.2.
- a section 17 is provided in the side wall 11.2 -optinal-, which has a smaller wall thickness.
- This section 17 is preferably circular in plan view. It serves as a bead which engages in a corresponding recess in the spring mechanism and thereby holds it in the recess 7.
- the housing 3 merges into the bracket section 5, which in side view has a smaller thickness d than the housing 3.
- the bracket section 5 has an elongated shape which, starting from the housing 3, has a rectangular cross section in a first longitudinal section R and then changes into a circular cross section in a longitudinal section K. The manufacture of the temple 1 is now explained with reference to FIGS. 2a to 2c.
- the housing 3 of the temple 1 is produced using the PIM, preferably the MIM (metal injection molding) method.
- the PIM method as a generic term for the MIM method is generally known, so that its description is omitted.
- the applicant's German patent application 195 11 16 7 describes a PIM production process for a spring hinge housing. The disclosure content of this application is hereby included in the scope of the present description.
- the PIM process permits the production of a part which, like the present spring hinge housing, has a complicated geometric shape. However, with the PIM method it is not possible to produce an elongated part with a very small diameter or thickness, as is the bracket section 5.
- a preferably cylindrical portion 5 1 in the first process step (PIM process).
- This section 5 ' directly adjoins the housing 3 which already has its final shape.
- the thickness d 'or the diameter of the part 5' corresponds to the height of the spring housing 3.
- this post-processing initially consists of reducing section 5 '.
- section 5 ′ is reduced in such a way that several sections with different diameters are created, the diameters decreasing starting from the housing 3 to the other end of section 5 1 .
- the transitions from one diameter to the other do not take place step-wise but continuously by means of conical longitudinal sections 19.
- any other contours are also possible.
- the reduction takes place, for example, with the aid of devices which hammer the peripheral surface of the bracket section 5.
- Other processing for reduction are also conceivable.
- the section of the bracket section 5 facing the housing 3 is reshaped, so that a longitudinal section R that is essentially rectangular in cross section results.
- the transition from section R to housing 3 takes place continuously by means of the oblique side wall 11.5.
- the longitudinal section K is also still to be shaped or embossed into its final shape.
- the temple piece has a shape which as such could not be produced by the PIM process.
- the method according to the invention can also be used for the production of other spectacle parts.
- the described temple was given purely by way of example. It is quite conceivable, for example, to produce accessories for glasses, such as cheeks, articulated jaws, bridges, nose bridges, bridge blades or bridges with integrated nose bridges and bridge blades, using the aforementioned method. The basic procedure is also retained for these parts. In this way, at least a section of the part to be manufactured is completely manufactured using the PIM method, so that post-processing is no longer necessary.
- the other section of the part is in the form of a blank according to the PIM process, which has to be reworked, in particular formed or embossed, to produce the final shape.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Ophthalmology & Optometry (AREA)
- Optics & Photonics (AREA)
- Eyeglasses (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19723119 | 1997-06-03 | ||
DE19723119A DE19723119C1 (en) | 1997-06-03 | 1997-06-03 | Method for manufacturing one=piece component, e.g. spectacle frame component |
PCT/EP1998/002517 WO1998055253A1 (en) | 1997-06-03 | 1998-04-29 | Method for producing an elongated single-piece structural part for spectacles |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0986447A1 true EP0986447A1 (en) | 2000-03-22 |
Family
ID=7831198
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98924238A Withdrawn EP0986447A1 (en) | 1997-06-03 | 1998-04-29 | Method for producing an elongated single-piece structural part for spectacles |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0986447A1 (en) |
JP (1) | JP2002501631A (en) |
CN (1) | CN1259066A (en) |
DE (1) | DE19723119C1 (en) |
WO (1) | WO1998055253A1 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003037552A1 (en) * | 2001-10-31 | 2003-05-08 | Agency For Science, Technology And Research | Methods of forming articles from alloys of tin and/or titanium |
DE102012015496A1 (en) * | 2012-08-03 | 2014-02-20 | OBE OHNMACHT & BAUMGäRTNER GMBH & CO. KG | In-ear headphones |
CN103042219A (en) * | 2012-12-27 | 2013-04-17 | 华侨大学 | Titanium glasses frame molding method |
DE102015206246A1 (en) * | 2015-04-08 | 2016-10-13 | OBE OHNMACHT & BAUMGäRTNER GMBH & CO. KG | Method for producing a metal bellows |
CN105618765B (en) * | 2016-01-06 | 2017-11-24 | 曲靖中铭科技有限公司 | A kind of common sintering forming process of MIM injection bases and metallic article |
CN106623896A (en) * | 2016-12-15 | 2017-05-10 | 鹰潭万成光学科技有限公司 | Powder injection pile head for laser welding for metal glasses, and machining process thereof |
KR102149825B1 (en) * | 2019-04-09 | 2020-08-31 | (주)제이씨에스몰드 | Eyeglass frame using metal injection molding |
CN110605822A (en) * | 2019-07-30 | 2019-12-24 | 上海富驰高科技股份有限公司 | Method for manufacturing long rod-shaped MIM product in non-shaping state |
CN118543833A (en) * | 2024-07-24 | 2024-08-27 | 天津常春汽车零部件有限公司 | Powder injection molding equipment for automobile parts |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3215326C2 (en) * | 1982-04-23 | 1984-10-11 | Optische Werke G. Rodenstock, 8000 München | Process for the production of a metallic composite material for spectacle frames |
DE19511167A1 (en) * | 1995-03-28 | 1996-10-10 | Obe Werk Kg | Spring hinge for glasses |
-
1997
- 1997-06-03 DE DE19723119A patent/DE19723119C1/en not_active Expired - Fee Related
-
1998
- 1998-04-29 WO PCT/EP1998/002517 patent/WO1998055253A1/en not_active Application Discontinuation
- 1998-04-29 EP EP98924238A patent/EP0986447A1/en not_active Withdrawn
- 1998-04-29 JP JP50136999A patent/JP2002501631A/en active Pending
- 1998-04-29 CN CN98805771.9A patent/CN1259066A/en active Pending
Non-Patent Citations (1)
Title |
---|
See references of WO9855253A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN1259066A (en) | 2000-07-05 |
DE19723119C1 (en) | 1998-08-20 |
WO1998055253A1 (en) | 1998-12-10 |
JP2002501631A (en) | 2002-01-15 |
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