CN111319200A - Easy-to-demould mould for medical device and manufacturing process thereof - Google Patents
Easy-to-demould mould for medical device and manufacturing process thereof Download PDFInfo
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- CN111319200A CN111319200A CN202010152106.9A CN202010152106A CN111319200A CN 111319200 A CN111319200 A CN 111319200A CN 202010152106 A CN202010152106 A CN 202010152106A CN 111319200 A CN111319200 A CN 111319200A
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- 238000004519 manufacturing process Methods 0.000 title claims description 15
- 239000002184 metal Substances 0.000 claims abstract description 113
- 229910052751 metal Inorganic materials 0.000 claims abstract description 113
- 238000001746 injection moulding Methods 0.000 claims abstract description 76
- 239000000919 ceramic Substances 0.000 claims abstract description 75
- 239000012778 molding material Substances 0.000 claims abstract description 24
- 238000001816 cooling Methods 0.000 claims abstract description 13
- 238000002844 melting Methods 0.000 claims abstract description 12
- 230000008018 melting Effects 0.000 claims abstract description 12
- 238000007747 plating Methods 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 16
- 210000005056 cell body Anatomy 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 10
- 230000008602 contraction Effects 0.000 claims description 7
- 238000011049 filling Methods 0.000 claims description 7
- 238000005498 polishing Methods 0.000 claims description 7
- 238000005096 rolling process Methods 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 claims 2
- 150000002739 metals Chemical class 0.000 abstract description 4
- 238000002360 preparation method Methods 0.000 abstract description 3
- 238000002347 injection Methods 0.000 description 9
- 239000007924 injection Substances 0.000 description 9
- 238000000465 moulding Methods 0.000 description 6
- 239000007769 metal material Substances 0.000 description 4
- 229910010293 ceramic material Inorganic materials 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010999 medical injection Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000005524 ceramic coating Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000006112 glass ceramic composition Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000010137 moulding (plastic) Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/37—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/3842—Manufacturing moulds, e.g. shaping the mould surface by machining
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/1756—Handling of moulds or mould parts, e.g. mould exchanging means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/753—Medical equipment; Accessories therefor
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention discloses an easy demoulding mould for medical devices and a preparation process thereof, and the easy demoulding mould comprises a female mould and a male mould, wherein a cavity formed after the female mould and the male mould are assembled is a mould cavity, a ceramic layer is plated on the whole or part of the inner cavity wall of the mould cavity, the surface of the ceramic layer is provided with a groove body, a metal piece is arranged in the groove body, the inner cavity surface of the mould cavity is provided with a plating layer in which ceramics and metals are alternately arranged, namely a ceramic area and a metal area are formed on the surface of the mould cavity, the outer sides of the female mould and the male mould are provided with a circulating cooling; when the molten injection molding material is injected into the cavity, the surface temperature of the cavity is consistent with the melting temperature of the injection molding material, the volume of the metal area is increased due to thermal expansion, and the surface of the metal area is flush with the inner surface of the cavity; when the molten injection molding material is not injected into the cavity, the surface temperature of the cavity is in a normal temperature state lower than the melting temperature of the injection molding material, and the metal area is shrunk and is recessed into the inner surface of the cavity.
Description
Technical Field
The invention relates to an injection mold for medical devices, in particular to an easy-to-demould mold for medical devices and a manufacturing process thereof.
Background
Injection molding is a method for producing and molding industrial products. The products are generally produced by rubber injection molding and plastic injection molding. The injection molding can be classified into injection molding and die casting. An injection molding machine (an injection machine or an injection molding machine for short) is a main molding device for making thermoplastic plastics or thermosetting materials into plastic products with various shapes by using a plastic molding die, and the injection molding is realized by the injection molding machine and the die. The injection molding method is generally used for injection molding in a mold cavity, and after an injection molded part is cooled and shaped, the situation that the injection molded part is subjected to excessive later repair steps and even determined as injection molding failure due to the fact that the injection molded part has a large friction coefficient or is partially bonded with the surface of the mold cavity usually exists.
The medical injection molding part has extremely high requirements on the material, and the injection mold often limits the material of the injection molding part in order to solve the problem of demolding, so that some medical injection molding parts are difficult to demold, and even chemical means such as a demolding agent are added, the effect is difficult to achieve. Therefore, a mold capable of reducing adhesion between an injection molded part and a mold cavity is needed.
Disclosure of Invention
The invention overcomes the defects of the prior art and provides the easy-demoulding mould for the medical device and the preparation method thereof.
In order to achieve the purpose, the invention adopts a technical scheme that: a cavity formed after the die and the male die are assembled is a cavity, a ceramic layer is plated on the wall of the whole or part of the inner cavity of the cavity, a groove body is arranged on the surface of the ceramic layer, a metal piece is arranged in the groove body, a plating layer with alternately arranged ceramics and metals is formed on the surface of the inner cavity of the cavity, namely a ceramic area and a metal area are formed on the surface of the cavity, a circulating cooling device is arranged on the outer sides of the die and the male die, and the coefficient of expansion with heat and contraction with cold of the ceramics is smaller than that of the expansion with heat and contraction with cold of the metals;
when the cavity is filled with molten injection molding materials, the surface temperature of the cavity is consistent with the melting temperature of the injection molding materials, the volume of the metal area is increased due to thermal expansion, and the surface of the metal area is flush with the inner surface of the cavity;
when the molten injection molding material is not injected into the cavity, the surface temperature of the cavity is in a normal temperature state lower than the melting temperature of the injection molding material, and the metal area is reduced in size and recessed into the inner surface of the cavity due to cold contraction.
In a preferred embodiment of the present invention, the metal member is made of copper or steel.
In a preferred embodiment of the present invention, the ceramic layer and the metal member are arranged in the following manner: and on the surface of the inner cavity of the cavity, the ceramic layer and the metal piece are alternately arranged in a parallel line form.
In a preferred embodiment of the present invention, in the cross section of the metal member, the thickness of the two sides of the metal member is greater than the thickness of the middle of the metal member.
In a preferred embodiment of the invention, the metal part can be inserted into the groove body in a structure fit manner when the material of the injection molding part is injected into the cavity in a molten state.
In a preferred embodiment of the invention, the width of the groove body is divided into: 1-5mm, 5-10mm, 10-15 mm.
In a preferred embodiment of the invention, when the width of the trough body is more than 5mm, the bottom area of the trough body is provided with spherical caulking grooves at intervals along the length direction of the trough body.
In a preferred embodiment of the invention, during demoulding of the injection-moulded part, the female mould or the male mould contacts a low-frequency vibrator.
In a preferred embodiment of the invention, the greater the height fluctuation difference in the surface of the cavity, the greater the degree of alternation of the metal part and the ceramic layer.
In a preferred embodiment of the present invention, the ceramic layer and the metal member are arranged in the following manner: and the ceramic layer and the metal piece are arranged on the surface of the inner cavity of the cavity in a staggered mode.
In a preferred embodiment of the invention, a core is arranged in the cavity, and the outer surface of the core is arranged the same as the surface of the inner cavity of the cavity.
In order to achieve the purpose, the invention adopts another technical scheme as follows: a manufacturing process of an easy-demoulding mould of a medical device comprises the following manufacturing steps:
s1, according to the structure of an injection molding piece, selecting a specific arrangement density for different fluctuation areas on the surface of a mold to finish the primary manufacture of the mold, and plating a layer of ceramic on the side wall of an inner cavity of a mold cavity of the mold;
s2, increasing the temperature and pressure of the mold, simulating the ambient temperature and pressure during injection molding, keeping the ambient temperature and pressure, starting to fill the metal piece, filling the metal piece into the groove body, sequentially grinding and polishing, and cooling after polishing is finished;
s3, after the temperature of the die is reduced to be lower than the room temperature, knocking or rolling the surface of the inner cavity of the cavity to ensure that the metal piece can be smoothly recessed into the surface of the cavity;
and S4, repeating the operations of S2-S3 at least twice, and then checking and accepting the die.
In a preferred embodiment of the invention, the surface of the ceramic layer is provided with a groove body, and the groove body is synchronously formed when the ceramic layer is plated or formed by etching the ceramic layer at a later stage.
In a preferred embodiment of the present invention, the arrangement of the trough bodies is determined by the arrangement density.
In a preferred embodiment of the invention, the metal element is fixed in the channel by direct embedding or in the form of a solidified molten metal.
The invention solves the defects in the background technology, and has the following beneficial effects:
(1) according to the easy-demoulding mould for the medical device, due to the ceramic and metal coatings which are alternately arranged, the microstructure of an injection molding piece is staggered in the process of separating the injection molding piece from the mould, the occurrence of adhesion or fracture of the injection molding piece during demoulding can be reduced, and in the cooling process of the injection molding piece, a metal area is not flush with a ceramic area on the surface of a cavity due to cooling, so that the contact area of the injection molding piece and the mould during demoulding is greatly reduced, namely the force for demoulding is reduced.
(2) The reason that the difference between the expansion coefficients of the metal piece and the ceramic layer is large is utilized, at the initial stage of manufacturing, the temperature of the molten state of the injection molding material is used as the temperature of the processing mold, the injection molding piece is ensured to be injected and cooled, the surface is relatively smooth, namely, the deep middle parts of two sides corresponding to the depth characteristic of the groove body where the corresponding metal piece is located are shallow, the two sides of the metal piece are thick, the middle part is thin, repeated knocking or rolling is carried out after the mold is cooled, and the smooth proceeding of the concave-convex process of the metal piece is ensured.
(3) When the mold is demolded, the mold contacts and conducts low-frequency vibration, so that the degree of the surface dislocation of the mold and the injection molding on the microcosmic scale is increased, and the adhesion of the surface of the injection molding during demolding and the force during demolding are reduced.
(4) The metal area and the ceramic area are distributed relatively evenly by the alternate arrangement of parallel lines or the staggered arrangement of squares, the adhesion rate on the microstructure corresponding to each area is reduced, and the alternate density is increased corresponding to a complicated area or an area with large fluctuation and fall of the surface of the mold, so that the difficulty of demolding the mold is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a manufacturing process of an easy-to-demold mold for medical devices according to the present invention;
FIG. 2 is a comparison of the changes in the cavity surface of the preferred embodiment of the present invention;
fig. 3 is a schematic illustration of a ceramic layer of a preferred embodiment of the present invention.
In the figure: 1. a metal member; 2. a ceramic layer; 3. caulking grooves; 4. and (5) molding.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be considered limiting of the scope of the present application. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art through specific situations.
The invention provides an easy demoulding mould for medical devices, which comprises a female mould and a male mould, wherein a cavity formed after the female mould and the male mould are assembled is a mould cavity, a ceramic layer 2 is plated on the whole or part of the inner cavity wall of the mould cavity, the surface of the ceramic layer 2 is provided with a groove body, a metal part 1 is arranged in the groove body, the inner cavity surface of the mould cavity is provided with a plating layer in which ceramics and metals are alternately arranged, namely a ceramic area and a metal area are formed on the surface of the mould cavity, circulating cooling devices are arranged on the outer sides of the female mould and the male mould, and the coefficient of thermal expansion and contraction of the ceramics is smaller than the coefficient of;
when the cavity is filled with molten injection molding materials, the surface temperature of the cavity is consistent with the melting temperature of the injection molding materials, the volume of the metal area is increased due to thermal expansion, and the surface of the metal area is flush with the inner surface of the cavity;
when the molten injection molding material is not injected into the cavity, the surface temperature of the cavity is in a normal temperature state lower than the melting temperature of the injection molding material, and the metal area is reduced in size and recessed into the inner surface of the cavity due to cold contraction.
The ceramic layer 2 plated on the surface of the die and the metal piece 1 are reserved with certain space after the size of the die is determined, the reserved space is used for occupying the ceramic layer 2 and the metal piece 1, the ceramic layer 2 is plated on the surface of the die, the ceramic layer 2 is not matched with the shape of a target injection molding piece, part of space is reserved for filling the ceramic layer 1, the space reserved on the surface of the metal piece 2, namely a groove body arranged on the surface of the metal piece 2, the inner cavity surface of the die cavity forms a plating layer and a metal which are alternately arranged, a ceramic area and a metal area are formed on the surface of the die cavity, a circulating cooling device is arranged on the outer side of the die, the ceramic layer 2 is a ceramic material, the ceramic material is a glass ceramic material, the ceramic expansion coefficient is equal to or less than 10.5-866, the linear expansion coefficient of the ceramic layer 2 is equal to or less than 10.5-866, and the linear expansion coefficient of the ceramic material is equal to or less than 10.5-865.
After the die is closed, when the molten injection molding material is injected into the cavity of the die, the surface temperature of the cavity is raised to be consistent with the melting temperature of the injection molding material, and the metal area is heated from the normal temperature state and then inevitably subjected to thermal expansion, so that the volume of the metal area is increased. In the process of preparing the mold, the metal part 1 is processed at the temperature equal to the melting temperature of the current injection molding material, and in the process of preparing the mold, the metal part 1 is ensured to be flush with the inner surface of the cavity, so that all the surfaces of the metal part 1 contact the surface of the injection molding part and no obvious interaction occurs (the situation that the metal part 1 is pressed against the surface of the injection molding part generally does not occur).
When the injection molding material in a molten state is not injected into the cavity, the temperature of the surface of the cavity is a normal temperature state lower than the melting temperature of the injection molding material, and the metal area is shrunk and has a reduced volume and is recessed into the inner surface of the cavity. That is, the cavity surface shape is recessed when the molten molding material is not injected.
Referring to fig. 2 for the above two cases, fig. 2 shows a comparison graph of the change of the cavity surface of the preferred embodiment of the present invention, wherein the left metal part 1 is flush with the surface of the ceramic layer 2, i.e. the current temperature is the temperature of the molten injection molding material, the right metal part 1 is recessed in the ceramic layer 2 (the surface of the ceramic layer 2 can be regarded as the whole cavity surface), and the change of the metal part 1 in fig. 2 is a cross-sectional view obtained when the metal part 1 and the caulking groove are in the shape of a linear bar. In the cross section of the metal piece 1 in the figure, the thicknesses of the two sides of the metal piece 1 are greater than the thickness of the middle of the metal piece 1, namely, the volume change of the middle of the metal piece 1 at the moment is smaller than the change total of the two sides, but the depths of the two sides of the metal piece 1 in the groove body are also improved to some extent, so that the moving amplitude of the middle of the metal piece 1 is greater than the moving amplitudes of the two sides in the deformation process, and the metal piece 1 can be relatively firmly embedded in the current groove body. When the material of injection molding was injected into with the molten state in the die cavity, the metal part 1 can the anastomotic embedding of structure in the cell body, when the temperature of metal part 1 promoted to the temperature under the injection molding molten state, the metal part 1 inflation, and its surface is leveled with ceramic layer 2, and metal part 1 can anastomotic inlay and establish and the full cell body region of complete filling, and metal part 1 is relatively firm at the in-process of moulding plastics, is difficult for breaking away from ceramic layer 2. It should be noted that fig. 2 only shows the shape change and the position relationship of the metal member 1, and does not relate to the corresponding thickness relationship and arrangement relationship of the metal member 1 and the ceramic layer 2. In the actual deformation, although the ceramic layer 2 is deformed into the cavity and has a certain relative compression to the metal layer, the difference between the thermal expansion coefficients of the metal layer and the ceramic layer 2 is large, so the amplitude change of the ceramic layer 2 in the figure is almost negligible.
The ceramic layer 2 and the metal part 1 are arranged in such a way that the ceramic layer 2 and the metal part 1 are alternately arranged in the form of parallel lines or the ceramic layer 2 and the metal part 1 are staggered in the form of grids on the surface of the inner cavity of the cavity. No matter parallel lines are arranged or squares are arranged in a staggered mode, the ceramic layer 2 and the metal piece 1 are distributed on the surface of the cavity uniformly, so that the whole contact of the injection molding piece and the mold is broken in the demolding process of the microstructure of all regions of the whole surface of the injection molding piece, and the probability of adhesion is greatly reduced. The choice of lines or squares can be determined by the surface texture properties of the injection-molded part to be machined. In the region with larger height fluctuation fall in the surface of the inner cavity of the cavity, the alternating degree of the metal piece 1 and the ceramic layer 2 is higher, namely, the corresponding changes of the two arrangement modes are as follows: the distance between the parallel lines increases or decreases and the surface area of the dice increases or decreases. The higher the alternation degree of the metal part 1 and the ceramic layer 2 corresponding to the area with large fall, the lower the probability that the injection molding part in the corresponding area is adhered to the mold, and the surface repairing and polishing process of the injection molding part in the area after demolding is reduced.
The injection molding that corresponds different volumes, the precision of corresponding mould preparation also is different, for this reason, the width of cell body divide into according to the size of injection molding: 1-5mm, 5-10mm, 10-15 mm. When the width of the groove body is larger than 5mm, the bottom area of the groove body is provided with spherical caulking grooves at intervals along the length direction of the groove body, namely, when the volume of a processed injection molding part is relatively large, the volume of the metal part 1 which is correspondingly arranged is relatively large, and the simple embedding possibly cannot play a good fixing role on the metal part 1 with the volume and the quality obviously increased, so that the spherical caulking grooves are added, specifically, as shown in figure 3, namely, in the process of plating a ceramic layer, the spherical caulking grooves are reserved in the groove body in advance, the metal part 1 is fixed in the groove body in a form of directly embedding or solidifying molten metal, namely, the spherical caulking grooves are correspondingly arranged, and the part embedded in the metal part 1 is correspondingly provided with spherical protrusions which are matched with the spherical protrusions or are guided into the groove body by the molten metal and enter the caulking grooves to be cooled.
The die cavity can also be internally provided with a core, and the outer surface of the core is arranged the same as the surface of the inner cavity of the die cavity. Because holes are needed to be arranged on an injection molding part many times, a core is needed to be placed in a cavity in the injection molding process, and the outer surface of the core can be arranged as same as the surface of the inner cavity of the cavity, namely a metal-ceramic coating.
In order to reduce the force for demoulding, when the metal part 1 is cooled and begins to be concave on the inner surface of a cavity in the demoulding process of the injection molding part, namely after the injection molding part is opened from a cooling cycle, in order to block the adhesion at the moment, the male die or the female die is contacted with the low-frequency vibrator from the cooling starting stage in the demoulding process, the contact area of the surface of the injection molding part and the metal part 1 of the mould is staggered in the cooling process, the vibration introduced by the low-frequency vibrator can increase the staggered degree in a microscopic way, and the adhesion is inhibited in the most easily adhered stage, so that the surface of the metal part 1 and the surface of the injection molding part are well separated.
Fig. 1 shows a flow chart of a manufacturing process of the easy-to-release mold for medical devices, which comprises the following manufacturing steps:
s1, according to the structure of an injection molding piece, selecting a specific arrangement density for different fluctuation areas on the surface of a mold to finish the primary manufacture of the mold, and plating a layer of ceramic on the side wall of an inner cavity of a mold cavity of the mold;
s2, increasing the temperature and pressure of the mold, simulating the ambient temperature and pressure during injection molding, keeping the ambient temperature and pressure, starting to fill the metal piece 1, filling the surface of the ceramic layer 2 in the metal piece 1, sequentially grinding and polishing, and cooling after polishing is finished;
s3, after the temperature of the die is reduced to be lower than the room temperature, knocking or rolling the surface of the inner cavity of the cavity to ensure that the metal piece 1 can be smoothly recessed into the surface of the cavity;
and S4, repeating the operations of S2-S3 at least twice, and then checking and accepting the die.
It should be noted that, the melting temperature of the injection molding to be processed by the current mold is recorded, the initial structure of the mold is selected according to the shape of the injection molding, a specific arrangement density is selected according to different undulating regions on the surface of the mold, and the prototype of the mold is preliminarily manufactured according to the thermal expansion coefficients of the materials of the ceramic layer 2 and the metal layer, the actual appearance of the injection molding, and the like.
At this time, the temperature of the material for the dummy injection in the molten state, that is, the temperature, pressure, etc. of the mold are raised, and the temperature of the environment during the dummy injection is maintained, and the filling of the metal material 1 is started, and the metal material 1 is filled on the surface of the ceramic layer 2. The packing of metalwork 1 except foretell embedding and solidification, metalwork 1 also can be double-deck material, ceramic layer 2 surface is equipped with the cell body, the cell body is synchronous shaping when ceramic layer 2 plates or is formed by the sculpture of later stage to ceramic layer 2, and the mode of arranging of cell body is confirmed by range density, and the metal material hardness of the metalwork 1 bottom that is located the cell body bottom of ceramic layer 2 is less, and is softer relatively, combines together with the bottom surface of the inner chamber of cell body easily, makes metalwork 1 be difficult for droing from the cell body, and the upper metal material hardness that is located metalwork 1 surface is great, and is harder relatively, and the difficult fish tail wearing and tearing in surface, and life is longer, and same metalwork 1 forms by the coincide of two kinds of materials. After filling metalwork 1, polish the die cavity surface, the inner chamber shape of die cavity this moment is identical with the shape of the injection molding of target, each department on the die cavity surface after polishing is level and smooth relatively, begin to carry out the decline of temperature this moment, and to below the room temperature, at the in-process that descends, strike or the roll-in to the inner chamber lateral wall of die cavity, prevent that metalwork 1 from because the resistance (the resistance is from self inside or inlays with ceramic layer 2 and establishes too closely) too big and can't cave in, here needs to carry out certain statistics and calculation to the width at metalwork 1 self place and the degree of depth of cell body, confirm that metalwork 1 under the current permutation alternative form can accomplish the deformation of great probability under corresponding temperature variation. And (3) after the steps 2-3 are repeatedly operated twice, checking the smoothness of the heated side wall of the inner cavity of the mold, and judging that the current mold is finished if the later repair rate corresponding to the smoothness is high and multiple indexes such as area occupation ratio of the region needing to be repaired, repair success rate and the like reach the standard.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. A medical device easy demoulding mould comprises a female mould and a male mould, wherein a cavity formed after the female mould and the male mould are assembled is a mould cavity, and the mould is characterized in that a ceramic layer is plated on the whole or partial inner cavity wall of the mould cavity, a groove body is arranged on the surface of the ceramic layer, a metal piece is arranged in the groove body, a plating layer in which ceramics and metal are alternately arranged is formed on the surface of the inner cavity of the mould cavity, namely a ceramic area and a metal area are formed on the surface of the mould cavity, circulating cooling devices are arranged on the outer sides of the female mould and the male mould, and the coefficient of expansion with heat and contraction with cold of the ceramics is smaller;
when the cavity is filled with molten injection molding materials, the surface temperature of the cavity is consistent with the melting temperature of the injection molding materials, the volume of the metal area is increased due to thermal expansion, and the surface of the metal area is flush with the inner surface of the cavity;
when the molten injection molding material is not injected into the cavity, the surface temperature of the cavity is in a normal temperature state lower than the melting temperature of the injection molding material, and the metal area is reduced in size and recessed into the inner surface of the cavity due to cold contraction.
2. The easy-to-release mold for medical devices according to claim 1, wherein: the metal piece is made of copper or steel.
3. The easy-to-release mold for medical devices according to claim 1, wherein: the ceramic layer and the metal piece are arranged in the following mode: and on the surface of the inner cavity of the cavity, the ceramic layer and the metal piece are alternately arranged in a parallel line form.
4. The easy-to-release mold for medical devices according to claim 3, wherein: in the cross section of the metal piece, the thickness of the two sides of the metal piece is larger than that of the middle of the metal piece.
5. The easy-to-release mold for medical devices according to claim 4, wherein: when the material of the injection molding part is injected into the cavity in a molten state, the metal part can be embedded into the groove body in a structure matching manner.
6. The easy-to-release mold for medical devices according to claim 1, wherein: the width of cell body divide into according to the size of injection molding: 1-5mm, 5-10mm, 10-15 mm.
7. The easy-to-release mold for medical devices according to claim 1, wherein: in the demolding process of the injection molding part, the female die or the male die is in contact with the low-frequency vibrator.
8. The easy-to-release mold for medical devices according to claim 1, wherein: the larger the height fluctuation fall in the surface of the inner cavity of the cavity is, the higher the alternating degree of the metal piece and the ceramic layer is.
9. The easy-to-release mold for medical devices according to claim 1, wherein: the ceramic layer and the metal piece are arranged in the following mode: and the ceramic layer and the metal piece are arranged on the surface of the inner cavity of the cavity in a staggered mode.
10. The process for manufacturing the easy-to-release mold for medical devices according to any one of claims 1 to 9, wherein: the method comprises the following manufacturing steps:
s1, according to the structure of an injection molding piece, selecting a specific arrangement density for different fluctuation areas on the surface of a mold to finish the primary manufacture of the mold, and plating a layer of ceramic on the side wall of an inner cavity of a mold cavity of the mold;
s2, increasing the temperature and pressure of the mold, simulating the environmental temperature and pressure during injection molding, keeping the environmental temperature and pressure, starting to fill the metal piece, filling the surface of the ceramic layer with the metal piece, sequentially grinding and polishing, and cooling after polishing is finished;
s3, after the temperature of the die is reduced to be lower than the room temperature, knocking or rolling the surface of the inner cavity of the cavity to ensure that the metal piece can be smoothly recessed into the surface of the cavity;
and S4, repeating the operations of S2-S3 at least twice, and then checking and accepting the die.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010152106.9A CN111319200A (en) | 2020-03-06 | 2020-03-06 | Easy-to-demould mould for medical device and manufacturing process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010152106.9A CN111319200A (en) | 2020-03-06 | 2020-03-06 | Easy-to-demould mould for medical device and manufacturing process thereof |
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| CN111319200A true CN111319200A (en) | 2020-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010152106.9A Withdrawn CN111319200A (en) | 2020-03-06 | 2020-03-06 | Easy-to-demould mould for medical device and manufacturing process thereof |
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| CN (1) | CN111319200A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113334668A (en) * | 2021-06-17 | 2021-09-03 | 慈溪市宗汉垄基机械配件厂 | Demolding-agent-free and exhaust-free brake pad disc pressing process |
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