CN113001129A - Processing method of fixed mold core of plastic mold and plastic mold - Google Patents
Processing method of fixed mold core of plastic mold and plastic mold Download PDFInfo
- Publication number
- CN113001129A CN113001129A CN202110273401.4A CN202110273401A CN113001129A CN 113001129 A CN113001129 A CN 113001129A CN 202110273401 A CN202110273401 A CN 202110273401A CN 113001129 A CN113001129 A CN 113001129A
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- 238000003672 processing method Methods 0.000 title claims abstract description 8
- 238000003754 machining Methods 0.000 claims abstract description 19
- 238000010146 3D printing Methods 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 238000010791 quenching Methods 0.000 claims abstract description 7
- 230000000171 quenching effect Effects 0.000 claims abstract description 7
- 238000005553 drilling Methods 0.000 claims abstract description 4
- 238000005496 tempering Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 239000003292 glue Substances 0.000 abstract description 7
- 238000001746 injection moulding Methods 0.000 abstract description 7
- 238000009760 electrical discharge machining Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000008280 blood Substances 0.000 description 2
- 210000004369 blood Anatomy 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- BEIGFKLRGRRJJA-JLHYYAGUSA-O 2-(2f-benzothiazolyl)-5-styryl-3-(4f-phthalhydrazidyl)tetrazolium chloride Chemical compound C=1C=C2C(=O)NNC(=O)C2=CC=1[N+](N(N=1)C=2SC3=CC=CC=C3N=2)=NC=1\C=C\C1=CC=CC=C1 BEIGFKLRGRRJJA-JLHYYAGUSA-O 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/007—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass injection moulding tools
-
- 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
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2701—Details not specific to hot or cold runner channels
- B29C45/2708—Gates
-
- 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
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2701—Details not specific to hot or cold runner channels
- B29C45/2708—Gates
- B29C2045/2709—Gates with a plurality of mould cavity inlets in close proximity
-
- 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 a processing method of a fixed mold core of a plastic mold and the plastic mold produced by the processing method. The processing method comprises the following steps: performing CNC (computer numerical control) and drilling processing on the mold core blank to obtain a base rough blank; 3D printing a mold core and a mold core runner on the base rough blank to obtain a fixed mold core rough blank; quenching the fixed die core rough blank; tempering the fixed die core rough blank; a wire through hole is processed in the center of the end face of the base runner; processing a cylindrical inlet gate on the wire passing hole along the central axis of the wire passing hole along the periphery; EDM machining is carried out on the fixed die core rough blank, and the EDM machining comprises the step of machining a base runner and a die core runner to preset shapes and sizes. According to the invention, the inlet gates are designed into the straight body holes in the shape of the cylinder, so that whether the dimensional deviation between the inlet gates is within the tolerance range can be effectively measured after the processing is finished, the problems of glue walking balance and no gate mark during injection molding of the porous plate are realized, the yield of the molded product is improved, and the production cost is reduced.
Description
Technical Field
The invention relates to the field of plastic mold manufacturing, in particular to a method for processing a fixed mold core of a plastic mold and the plastic mold.
Background
Plastic multi-well plates are widely used in the medical industry, for example, for holding blood collection tubes, and the production of such multi-well plates requires the use of plastic molds.
As shown in fig. 1 and 2, in the existing mold for producing the product, glue is generally injected into a gate at the top of a plastic product, the diameter of the gate is designed to be 0.39mm, and the included angle of the section of the central axis of the gate is 32 °. The following problems are common to this approach:
1. the processing size error of the inlet gate is larger, and the glue is unbalanced in the injection molding process.
2. The size of the inlet part is larger, so that a plastic part product has a sprue mark at the sprue part, subsequent processing is needed, and the production cost is higher.
3. The size deviation of the side of the inlet gate is large, burrs of a plastic product are easy to generate, and the reject ratio of injection molding production is high.
Disclosure of Invention
Aiming at the problems of the existing plastic mold, the invention provides a method for processing a fixed mold core of the plastic mold, which realizes the glue walking balance during the injection molding of a thin-wall plastic part product and solves the problem of gate glue residue, and provides the following technical scheme:
a processing method of a fixed mold core of a plastic mold comprises the following steps: CNC machining is carried out on the mold core blank to obtain a base rough blank; drilling the base rough blank, wherein a base runner penetrating through the upper surface and the lower surface of the base rough blank is processed; 3D printing a mold core and a mold core runner on the upper surface of the base rough blank to obtain a fixed mold core rough blank, wherein the mold core runner and the base runner are the same in number and are in one-to-one correspondence in position, and a sprue reserved position is arranged between the mold core runner and the base runner; quenching the fixed die core rough blank; tempering the fixed die core rough blank; a wire passing hole which is coincident with the central axis of the base flow channel is processed in the center of the end face of the base flow channel and is used for communicating the mold core flow channel with the base flow channel; processing an inlet gate on the wire penetrating hole along the central axis of the wire penetrating hole to the periphery, wherein the inlet gate is processed into a cylindrical through hole; EDM machining is carried out on the fixed die core rough blank, and the EDM machining comprises the step of machining a base runner and a die core runner to preset shapes and sizes.
Further, when the base rough blank is drilled, the method further comprises the following steps: processing a plurality of water conveying holes on the side surface of the base rough blank; and machining internal threads on each water conveying hole.
Furthermore, the total number of the water transporting holes is 13, the water transporting holes are respectively positioned on four side elevation surfaces of the base rough blank, and the diameter of each water transporting hole is 3 mm.
Further, when the mold core and the mold core flow channel are printed on the upper surface of the base rough blank in a 3D mode, the thickness of a gate inlet reserved position reserved between the mold core flow channel and the base flow channel is 1.5 mm.
Furthermore, after CNC machining is carried out on the die core blank, a quenching allowance with the thickness of 0.3 mm is reserved on each outer side face of the base rough blank.
Further, the diameter of the wire through hole is 0.1 mm.
Further, the diameter of the inlet gate is 0.25mm, and the fineness of the inlet gate is Ra0.4 microns.
Further, after EDM processing is carried out on the fixed die core rough blank, the length of the sprue is 0.05 mm, a connecting part of the base runner and the sprue is a conical through hole, and the included angle of the section of the central axis of the conical through hole is 60 degrees.
Furthermore, the aperture of each base runner is 1mm, and the number of the base runners is 96, and the base runners are respectively distributed in the base rough blank in an array mode.
On the other hand, the invention provides the plastic mould produced by applying the processing method of the fixed mould core of the plastic mould, and the material of the mould core blank is Corrax material.
The invention designs the inlet gates of the fixed mold core of the plastic mold into the cylindrical straight body holes, and the design scheme breaks through the traditional design concept of the full inclination of the end parts of the inlet gates, breaks through the inherent design thinking, provides technical support for ensuring the size processing precision of the inlet gates, ensures that the size deviation among the inlet gates can be effectively measured after the mold processing is finished and whether the size deviation is within the tolerance range, realizes the problems of glue walking balance and no gate mark during the injection molding of the porous plate, improves the yield of plastic products, reduces the production cost of enterprises, and effectively improves the core competitiveness of the enterprises.
Drawings
FIG. 1 is a schematic cross-sectional view of a conventional multi-cellular plastic mold;
FIG. 2 is an enlarged view of portion A of FIG. 1;
FIG. 3 is a schematic process flow diagram of an embodiment of the present invention;
FIG. 4 is a schematic view of a base structure according to an embodiment of the present invention;
FIG. 5 is a top view of a base according to an embodiment of the present invention;
FIG. 6 is a cross-sectional view taken along line B-B of FIG. 5;
FIG. 7 is a schematic structural diagram of a 3D printing mold core and a mold closing positioning block according to an embodiment of the invention;
FIG. 8 is a top view of a 3D printing mold core and a mold clamping positioning block according to an embodiment of the invention;
FIG. 9 is a cross-sectional view taken along line C-C of FIG. 8;
FIG. 10 is a schematic structural diagram of a 3D printing device according to an embodiment of the present invention;
FIG. 11 is a top view of an embodiment of the present invention after 3D printing is completed;
FIG. 12 is a cross-sectional view taken along line D-D of FIG. 11;
fig. 13 is an enlarged view of portion E of fig. 12;
FIG. 14 is a schematic view of the structure of FIG. 13 after being processed through a threading hole;
FIG. 15 is a schematic view of the structure of FIG. 14 after a wire cutting process;
fig. 16 is a schematic view of the structure of fig. 15 after EDM machining.
Detailed Description
To further illustrate the technical means and effects of the present invention, a mold for manufacturing a multi-well plate for a 96-well blood collection tube will be described below with reference to the accompanying drawings.
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. 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.
As shown in fig. 3, a method for processing a fixed mold core of a plastic mold comprises the following steps:
and S1, processing the base rough blank 1 by using the die core blank.
And S2, printing the mold core 5 and the mold core runner 6 on the base rough blank 1 by using a 3D printing technology to obtain a fixed mold core rough blank.
And S3, quenching the fixed die core rough blank.
And S4, tempering the fixed mold core rough blank.
And S5, machining a wire passing hole 9 in the fixed die core rough blank.
S6, an inlet gate 10 is formed along the center axis of the threading hole 9.
And S7, carrying out EDM (electrical discharge machining) on the fixed die core rough blank to machine the accurate shapes and sizes of the base runner 4 and the die core runner 6.
After the processing is finished, the shape of the inlet gates 10 in the fixed mold core of the obtained plastic mold is a cylindrical straight body hole, and the mode can ensure that whether the size deviation between the inlet gates is in a tolerance range can be effectively measured after the mold processing is finished, so that the problem that the plastic running balance is realized during the injection molding of the porous plate, and no gate mark exists.
The above processing steps are described in detail below:
as shown in fig. 4 to 6, in step "S1", the following subdivision steps are included:
1. selecting Corrax material plates with proper sizes as mould core blanks, and processing the mould core blanks to the external sizes on a CNC machine tool, wherein the external sizes are respectively as follows: the method comprises the steps of machining a base rough blank 1 which is 191.6 mm long, 147.6 mm wide and 40 mm high, machining two steps 2 on two opposite side faces of the base rough blank 1 along the length direction, wherein the two steps 2 are symmetrically distributed along the central axis of the length direction, the height difference between the two steps 2 and the upper surface of the base rough blank 1 is 19.5 mm, and the two steps 2 are used as mounting and fixing positions for 3D printing in the step S2. And a quenching allowance with the thickness of 0.3 mm is reserved on each outer side surface of the base rough blank 1.
2. And (3) drilling 13 water conveying holes 3 with the diameter of 3 mm on 4 side vertical surfaces of the base rough blank 1 by using a deep hole drill, wherein the deviation degree of the hole diameter of each water conveying hole 3 is controlled within 0.3 mm.
3. And (3) processing internal threads on each water conveying hole 3, processing BSPT 1/8' throat teeth, and controlling the verticality of the throat teeth within 0.2 mm.
4. And processing 8 rows and 12 rows by using a punching machine, wherein 96 base flow passages 4 penetrate through the upper surface and the lower surface of the base rough blank, the aperture of each base flow passage 4 is 1mm, and the base flow passages are distributed on the upper surface and the lower surface of the base rough blank 1 in an array manner.
As shown in fig. 7-13, in step "S2", the mold core 5, the mold core runner 6, and two mold clamping positioning blocks 7 are printed on the upper surface of the base blank 1 by using a 3D metal printing apparatus, and the two mold clamping positioning blocks 7 are respectively located at the left and right sides of the mold core 5 and respectively connected to the left and right sides of the base blank 1. The mold core runners 6 are in the same number and in one-to-one correspondence with the base runners 4, and a sprue reserved position 8 with the thickness of 1.5 mm is arranged between the mold core runners 6 and the base runners 4. The die assembly positioning block 7 is used for rapidly assembling and positioning the front die and the rear die when the plastic die works.
As shown in fig. 14, in step S5, a piercing hole 9 coinciding with the central axis of the base runner 4 is formed in the direction of the mold core runner 6 at the center of the end face of each base runner 4 by using a piercing machine, the aperture of the piercing hole 9 is 0.1 mm, and the piercing hole 9 communicates the base runner 4 and the mold core runner 6 corresponding to each other.
As shown in fig. 15, in step "S6", an inlet gate 10 is machined in the threading hole 9 along the central axis of the threading hole 9 toward the periphery by a precision wire cutting machine, wherein the inlet gate 10 is machined into a cylindrical through hole with a bore diameter of 0.25mm and a finish of ra0.4 μm; the dimensional tolerance accuracy of each in-gate 10 is 0 to +0.005 mm.
As shown in fig. 16, in step S7, 96 runners are machined to a desired size by a precision wire EDM spark machine, and finally the gate 10 and the runners are machined. After EDM processing is finished, the inlet gate 10 is a cylindrical through hole with the length of 0.05 mm, a conical through hole 41 is formed in the joint of the base runner 4 and the inlet gate 10, the included angle of the section of the central axis of the conical through hole 41 is 60 degrees, an annular groove 61 is processed in the joint of the mold core runner 6 and the inlet gate 10, and the height difference between the deepest part of the annular groove 61 and the end face, close to the mold core runner 6, of the inlet gate 10 is 0.1 mm.
According to the invention, through an innovative design of a gate inlet scheme, the latest metal 3D printing technology is combined with a precision machining technology, 96 gate inlets with the diameter of 0.25mm are machined on the same mold, the dimensional precision of all the gate inlets is controlled within 0.01mm, the degree of finish is 0.4um, and the remarkable effects of glue walking balance and no gate mark of a medical 96-cavity porous plate during injection molding through a plastic mold are realized.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Claims (10)
1. A processing method of a fixed mold core of a plastic mold is characterized by comprising the following steps:
CNC machining is carried out on the mold core blank to obtain a base rough blank;
drilling the base rough blank, wherein a base runner penetrating through the upper surface and the lower surface of the base rough blank is processed;
3D printing a mold core and a mold core runner on the upper surface of the base rough blank to obtain a fixed mold core rough blank, wherein the mold core runner and the base runner are the same in number and are in one-to-one correspondence in position, and a sprue reserved position is arranged between the mold core runner and the base runner;
quenching the fixed die core rough blank;
tempering the fixed die core rough blank;
a wire passing hole which is coincident with the central axis of the base flow channel is processed in the center of the end face of the base flow channel and is used for communicating the mold core flow channel with the base flow channel;
processing an inlet gate on the wire penetrating hole along the central axis of the wire penetrating hole to the periphery, wherein the inlet gate is processed into a cylindrical through hole;
EDM machining is carried out on the fixed die core rough blank, and the EDM machining comprises the step of machining a base runner and a die core runner to preset shapes and sizes.
2. The method for processing the fixed mold core of the plastic mold according to claim 1, wherein the method further comprises the following steps when the base rough blank is drilled:
processing a plurality of water conveying holes on the side surface of the base rough blank;
and machining internal threads on each water conveying hole.
3. The method for processing the fixed die core of the plastic die as claimed in claim 2, wherein the number of the water conveying holes is 13, the water conveying holes are respectively positioned on four side elevation surfaces of the base rough blank, and the diameter of each water conveying hole is 3 mm.
4. The method for processing the fixed mold core of the plastic mold as claimed in claim 3, wherein when the mold core and the mold core runner are 3D printed on the upper surface of the base rough blank, the thickness of a gate inlet reserved position reserved between the mold core runner and the base runner is 1.5 mm.
5. The method for processing the fixed mold core of the plastic mold as claimed in claim 4, wherein a quenching allowance with a thickness of 0.3 mm is reserved on each outer side surface of the base rough blank after CNC processing is performed on the mold core blank.
6. The method of manufacturing a plastic mold fixed die core as claimed in claim 5, wherein the diameter of the threading hole is 0.1 mm.
7. The method of claim 6, wherein the diameter of the gate is 0.25mm and the gate finish is Ra0.4 μm.
8. The method for processing the fixed mold core of the plastic mold as claimed in claim 7, wherein after EDM processing is performed on the fixed mold core blank, the length of the inlet gate is 0.05 mm, a connecting part of the base runner and the inlet gate is a conical through hole, and an included angle of a section of a central axis of the conical through hole is 60 degrees.
9. The method for processing the fixed mold core of the plastic mold as claimed in claim 8, wherein the base runners have respective apertures of 1mm, and the number of the base runners is 96, and the base runners are respectively distributed in the base rough blank in an array manner.
10. A plastic mould produced by a method of manufacturing a fixed mould core for a plastic mould according to any one of claims 1 to 9, wherein the core blank is made of a Corrax material.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110273401.4A CN113001129B (en) | 2021-03-11 | 2021-03-11 | Processing method of fixed mold core of plastic mold and plastic mold |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110273401.4A CN113001129B (en) | 2021-03-11 | 2021-03-11 | Processing method of fixed mold core of plastic mold and plastic mold |
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| Publication Number | Publication Date |
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| CN113001129A true CN113001129A (en) | 2021-06-22 |
| CN113001129B CN113001129B (en) | 2022-03-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114228064A (en) * | 2022-02-21 | 2022-03-25 | 赫比(成都)精密塑胶制品有限公司 | Point pouring gate processing method, point pouring gate processing equipment and mold with point pouring gate |
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| WO2020118412A1 (en) * | 2018-12-11 | 2020-06-18 | Husky Injection Molding Systems Ltd. | Molds, mold assemblies and stack components |
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| CN114228064A (en) * | 2022-02-21 | 2022-03-25 | 赫比(成都)精密塑胶制品有限公司 | Point pouring gate processing method, point pouring gate processing equipment and mold with point pouring gate |
| CN114228064B (en) * | 2022-02-21 | 2022-05-06 | 赫比(成都)精密塑胶制品有限公司 | Point pouring gate machining method, point pouring gate machining equipment and mold with point pouring gate |
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| CN113001129B (en) | 2022-03-11 |
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