CN111283385A - Ultra-precise die machining method and ultra-precise die - Google Patents
Ultra-precise die machining method and ultra-precise die Download PDFInfo
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- CN111283385A CN111283385A CN202010118314.7A CN202010118314A CN111283385A CN 111283385 A CN111283385 A CN 111283385A CN 202010118314 A CN202010118314 A CN 202010118314A CN 111283385 A CN111283385 A CN 111283385A
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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
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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
- B29C45/2602—Mould construction elements
Abstract
The invention relates to the technical field of die manufacturing, in particular to an ultra-precise die machining method and an ultra-precise die. An ultra-precision mold processing method, comprising S1: determining a position; s2: determining a matching structure; s3: processing the part; s4: processing a tooling fixture; s5: processing a die cavity and a pin hole; s6: disassembling; s7: and (6) assembling. The ultra-precision mold comprises a lower mold and an upper mold, wherein the upper end of the lower mold is a two-degree conical cylinder, a lower mold cavity is formed in the lower mold, the upper mold comprises an upper mold sleeve and an upper mold inner cavity, the upper mold sleeve is provided with a cylindrical hole and a two-degree conical hole, the upper mold sleeve is in interference connection with the upper mold inner cavity, the upper mold inner cavity is coaxial with the cylindrical hole and the two-degree conical hole, the two-degree conical hole of the upper mold sleeve is connected with the two-degree conical cylinder of the lower mold through conical surface fit, the upper mold cavity is formed in the upper mold inner cavity, and the. The conical surface die assembly of the upper die and the lower die plays a role in fine positioning, the die cavity is machined at one time, the position precision is almost zero, the technical requirements are met, and the casting quality is improved.
Description
Technical Field
The invention relates to the technical field of die manufacturing, in particular to an ultra-precise die machining method and an ultra-precise die.
Background
In the mold industry, an injection mold is generally divided into an upper mold and a lower mold, the upper mold is fixed on an upper template of a mold base, the lower mold is fixed on a lower template, a product is subjected to mold assembly in the injection molding process, the product is taken out by the mold after injection molding and cooling, parts of the common mold are produced by separately processing single parts, errors can exist in processing, a certain deviation amount exists after the mold is assembled, accurate positioning after the upper mold and the lower mold are assembled cannot be guaranteed, in addition, an upper mold cavity and a lower mold cavity of the mold are also produced by separately processing, the mold cavity has deviation after mold assembly, technical requirements for an ultra-precise mold cavity cannot be met, the mold cavity is a core part of the injection molded product of the mold, if the precision requirements of the mold cavity cannot be met, the casting quality of the product is directly influenced, waste products can also appear due to excessive deviation, the production cost is increased.
Disclosure of Invention
The invention aims to solve the technical problems that the positioning accuracy of an upper die and a lower die after the upper die and the lower die are closed cannot be guaranteed in the traditional die part processing, a die cavity processed by the traditional die cavity processing method has certain deviation, and the technical requirements of an ultra-precise die cavity cannot be met.
The invention also aims to solve the technical problems that the casting quality of a product is influenced because the upper die and the lower die of the traditional die are not accurately positioned and the technical requirements of an ultra-precise die cavity cannot be met.
The technical scheme adopted by the invention for realizing the purpose is as follows: a processing method of an ultra-precise die comprises the following steps:
s1: determining the position: determining the assembly positioning relation of the lower die, the upper die sleeve and the inner cavity of the upper die and the position requirements of the upper die cavity and the lower die cavity;
s2: determining a matching structure: determining the matching structure of the upper die and the lower die to play a self-centering role in angle matching, wherein the angle matching is that the conical column of the lower die is matched with the conical hole of the upper die sleeve;
s3: processing the parts: respectively processing an upper die sleeve, an upper die inner cavity and a lower die, processing the upper die sleeve, clamping and processing a cylindrical hole and a conical hole of the upper die sleeve on an inner hole grinding machine at one time, and ensuring that the coaxiality is within 0.001 mm; processing an inner cavity of the upper die, wherein the diameter of a cylinder of the upper die sleeve is used as a reference dimension A, and the outer diameter dimension of the inner cavity of the upper die is determined to be A + interference magnitude of 0.007-0.008 mm for post-processing; processing a lower die, namely processing a conical column matched with the conical hole of the upper die sleeve at the upper end of the lower die;
s4: processing a tooling fixture: manufacturing a tool fixture with the same size as the cylindrical aperture and the conical aperture of the upper die sleeve;
s5: processing a die cavity and a pin hole: the tool fixture is connected with the inner cavity of the upper die in a hot-assembling mode according to the technical requirements of products, the tool fixture is assembled with the lower die according to the position requirements, the inner cavity of the upper die and the lower die are automatically centered, the tool fixture, the inner cavity of the upper die and the lower die are placed on a linear cutting machine to process a die cavity once after being assembled, the position degree and the size precision are guaranteed, and after the die cavity is processed, a positioning pin hole is processed on the lower die, and the position consistency is guaranteed;
s6: disassembling: after the die cavity and the positioning pin hole are machined, separating the tool fixture from the lower die, and slightly knocking the inner cavity of the upper die out of the tool fixture by using a copper hammer;
s7: assembling: and performing hot-charging connection on the upper die sleeve and the inner cavity of the upper die according to the technical requirements of products.
Further, in S2, the contact area between the conical column of the lower mold and the conical hole fitting surface of the upper mold sleeve is greater than 80%, the center of the circle is automatically locked after fitting, and the height tolerance between the bottom surface of the lower mold and the top surface of the upper mold sleeve is 0-0.01 mm.
Further, in S3, the upper die is sleeved and clamped on the inner hole grinding machine, the upper die is sleeved and clamped after semi-finishing the cylindrical hole, the grinding workbench is rotated by two degrees and then rough machining and semi-finishing the tapered hole are continued, the grinding workbench is rotated to zero degree and then the cylindrical hole is finished, and then the grinding workbench is rotated to finish the tapered hole by two degrees.
Further, in S5, the tool jig and the upper die inner cavity are connected in a hot-assembling mode, namely the tool jig is heated to 100-150 ℃ in the electric furnace, and then the upper die inner cavity is placed into the tool jig according to requirements and cooled.
Further, in S5, the coaxiality of the lower die and the inner cavity of the upper die assembled together by the tooling jig is within 0.001 mm.
Further, in S5, the mold cavity machining ensures that the position degree is consistent and is between 0 mm and 0.001 mm.
Further, in the step S7, the upper die sleeve and the upper die inner cavity are connected in a hot-fitting manner, that is, the upper die sleeve is heated to 100-150 degrees in an electric furnace, and then the upper die inner cavity is placed into the upper die sleeve according to the position direction requirement and then cooled.
The technical scheme adopted by the invention for realizing the other purpose is as follows: ultra-precision mould, including lower mould and last mould, the lower mould bottom is equipped with the lower mould backing plate, the upper end of lower mould is the taper cylinder of two degrees, the die cavity has been seted up on the lower mould, it includes die sleeve and last mould inner chamber to go up the mould, go up the die sleeve and seted up cylinder hole and two degrees taper hole, cylinder hole and two degrees taper hole are coaxial, it is connected with last mould inner chamber interference to go up the die sleeve, it is coaxial with cylinder hole and two degrees taper hole to go up the die sleeve, the taper hole of two degrees of going up the die sleeve passes through the conical surface cooperation with the taper cylinder of lower mould and is connected, it has seted up the die cavity on the last mould inner chamber, it forms the die cavity with lower die cavity closure to go up the die cavity top, it is located between the die sleeve to.
Furthermore, the coaxiality of the cylindrical hole, the two-degree taper hole and the inner cavity of the upper die sleeve is within 0.001 mm.
Furthermore, the position error of the upper die cavity and the lower die cavity is 0-0.001 mm.
The invention has the beneficial effects that:
(1) the upper die and the lower die are processed into conical surfaces, the conical column of the lower die is matched with the conical hole of the upper die sleeve, and the circle center is automatically locked after matching, so that the positioning precision is ensured.
(2) And the cylindrical hole and the two-degree taper hole of the upper die sleeve are clamped and processed at one time, so that the coaxiality is ensured to be within 0.001 mm.
(3) The die cavity processing is also based on the conical surface self-centering principle, the die cavity is processed by assembling the upper die inner cavity and the lower die together through the centering of the tooling fixture, so that the positions of the upper die cavity and the lower die cavity are processed at one time, the position precision is almost zero, and the technical requirements are completely met.
(4) The upper die sleeve and the inner cavity of the upper die are designed in an interference fit manner, so that the clearance can be eliminated, the centering precision is controlled, the hot charging temperature is determined according to the thermal expansion amount, the upper limit of the temperature cannot be higher than the tempering temperature of the material, and the stability of the hot charging to the product is better.
(5) According to the mold processed by the method, the upper mold and the lower mold are matched through the two-degree conical surface, the precise positioning effect is achieved, the precise positioning of the mold cavity can be controlled, the position error of the upper mold cavity and the lower mold cavity is 0-0.001 mm, the production and technical requirements of the ultra-precise mold cavity are met, the casting quality of a product is improved, the production cost is reduced, and the production efficiency is improved.
Drawings
FIG. 1 is a view showing the structure of a mold of the present invention.
Fig. 2 is a structural diagram of the assembly of the tooling fixture of the present invention with an upper die cavity and a lower die.
Fig. 3 is a structural diagram of the tool fixture of the present invention after being detached from the inner cavity of the upper die.
FIG. 4 is a structural view of the upper die case and the upper die cavity hot-fitting of the present invention.
In the figure: 1. the die comprises a lower die, 2 parts of an upper die sleeve, 3 parts of an upper die inner cavity, 4 parts of a tooling jig, 5 parts of a lower die base plate, 6 parts of an upper die lining plate, 7 parts of a die cavity, 8 parts of a matching surface and 9 parts of a positioning pin hole.
Detailed Description
The present invention will be described in detail below with reference to the drawings and examples, but the present invention is not limited to the specific examples.
A processing method of an ultra-precise die comprises the following steps:
s1: determining the position: determining the assembly positioning relation of the lower die 1, the upper die sleeve 2 and the upper die cavity 3 and the position requirements of the upper die cavity and the lower die cavity;
s2: determining a matching structure: determining the matching structure of the upper die and the lower die 1 to play a self-centering role in angle matching, wherein the angle matching is that a two-degree conical column of the lower die 1 and a two-degree conical hole of the upper die sleeve 2 are matched with each other, the contact area of a matching surface 8 is ensured to be larger than 80% through machine tool machining, the self-centering and limiting roles are played, the circle center is automatically locked after matching, and the height tolerance of the bottom surface of the lower die 1 and the top surface of the upper die sleeve 2 is 0-0.01 mm;
s3: processing the parts: respectively processing an upper die sleeve 2, an upper die inner cavity 3 and a lower die 1, processing the upper die sleeve 2, clamping the upper die sleeve 2 on an inner hole grinding machine, clamping the upper die sleeve 2 after semi-finishing a cylindrical hole, keeping the upper die sleeve 2 immovable, rotating a grinding workbench for two degrees, continuing rough machining and semi-finishing a conical hole, then rotating the grinding workbench to zero degree, finishing the cylindrical hole, then rotating the grinding workbench for finish machining the conical hole for two degrees, and clamping and processing the cylindrical hole and the conical hole for two degrees of the upper die sleeve 2 on the inner hole grinding machine for one time to ensure that the coaxiality is within 0.001 mm; processing an upper die inner cavity 3, wherein the cylindrical aperture of the upper die sleeve 2 is used as a reference dimension A, the outer diameter dimension of the upper die inner cavity 3 is determined to be A + interference magnitude of 0.007-0.008 mm, the interference magnitude is controlled to be 0.007-0.008 mm through factors such as calculation of deformation magnitude control, and the stability of the tightening stress of the upper die inner cavity 3 by the upper die sleeve 2 is optimal; processing a lower die 1, wherein a two-degree conical column matched with the two-degree conical hole of the upper die sleeve 2 is processed at the upper end of the lower die 1;
s4: processing of the tooling jig 4: manufacturing a tool fixture 4 with the same size as the cylindrical aperture and the conical aperture of the upper die sleeve 2, wherein the outer diameter of a two-degree conical hole of the tool fixture 4 is 186mm, the total length is 42mm, and the length of the two-degree conical hole is 14 mm;
s5: and (3) machining a die cavity 7 and a pin hole: carrying out hot-assembly connection on a tooling jig 4 and an upper die inner cavity 3 according to the technical requirements of products, namely, heating the tooling jig 4 in an electric furnace to 100-150 ℃, putting the upper die inner cavity 3 into the tooling jig 4 according to the requirements, cooling, assembling the tooling jig 4 and a lower die 1 together according to the position requirements, so that the upper die inner cavity 3 and the lower die 1 are automatically centered, the coaxiality of the lower die 1 and the upper die inner cavity 3 assembled together by the tooling jig 4 is within 0.001mm, putting the tooling jig 4, the upper die inner cavity 3 and the lower die 1 on a wire cutting machine after being assembled, and processing a die cavity 7 for one time, wherein the processing of the die cavity 7 ensures the position and the dimensional accuracy, the error is between 0 and 0.001mm, and processing a positioning pin hole 9 on the lower die 1 after the die cavity 7 is processed, so as to ensure the position consistency, wherein two positioning pin holes 9 are phi 13mm in size, as shown;
s6: disassembling: after the die cavity 7 and the positioning pin hole 9 are machined, separating the tool fixture 4 from the lower die 1, and slightly knocking the inner cavity 3 of the upper die out of the tool fixture 4 by using a copper hammer as shown in fig. 3;
s7: assembling: the upper die sleeve 2 and the upper die inner cavity 3 are connected in a hot-charging mode according to the technical requirements of products, as shown in fig. 4, the upper die sleeve 2 is heated to 100-150 ℃ in an electric furnace, then the upper die inner cavity 3 is placed into the upper die sleeve 2 according to the position direction requirement, and then the upper die inner cavity is cooled.
In the embodiment of the invention, the processing method of the ultra-precise die is not limited to processing the ultra-precise die shown in fig. 1, and is suitable for processing the die with the position error requirement of the upper die cavity and the lower die cavity being 0-0.001 mm.
An ultra-precise mold based on the processing method of the ultra-precise mold provided by the embodiment comprises a lower mold 1 and an upper mold, as shown in fig. 1, a lower mold backing plate 5 is arranged at the bottom of the lower mold 1, the upper end of the lower mold 1 is a two-degree conical cylinder, a lower mold cavity and two phi 13 positioning pin holes are arranged on the lower mold 1, the upper mold comprises an upper mold sleeve 2 and an upper mold inner cavity 3, the upper mold sleeve 2 is provided with a cylindrical hole and a two-degree conical hole which are coaxial, the cylindrical hole and the two-degree conical hole are clamped and processed at one time, the coaxiality is ensured to be within 0.001mm, the upper mold sleeve 2 is in interference connection with the upper mold inner cavity 3, the clearance can be eliminated through the interference connection, the centering precision is controlled, the interference magnitude of the upper mold sleeve 2 and the upper mold inner cavity 3 is 0.007-0.008 mm, the interference magnitude is controlled to be between 0.007-0.008 mm through factors such as calculation of deformation magnitude, the upper die inner cavity 3 is coaxial with the cylindrical hole and the two-degree taper hole, the coaxiality of the cylindrical hole, the two-degree taper hole and the upper die inner cavity 3 of the upper die sleeve 2 is within 0.001mm, the two-degree taper hole of the upper die sleeve 2 is connected with the two-degree taper cylinder of the lower die 1 in a matched mode through a conical surface, the contact area of a matched surface 8 is larger than 80%, the self-centering and limiting effects are achieved, the matched height tolerance is 0-0.01 mm, the positioning precision is guaranteed, the upper die cavity 3 is provided with an upper die cavity, the upper die cavity and the lower die cavity are closed to form a die cavity 7, the die cavity 7 is machined through the tooling fixture 4 in one step, the position error of the upper die cavity and the lower die cavity is 0-0.001 mm, and the structure of, the mold cavity structure that the position error of the upper mold cavity and the lower mold cavity is required to be between 0-0.001 mm can be realized, the top of the upper mold cavity 3 is provided with an upper mold lining plate 6, and the upper mold lining plate 6 is positioned between the upper mold sleeves 2.
According to the processing method of the ultra-precise mold, the matching surfaces of the upper mold and the lower mold are processed into conical surface matching, so that the conical surfaces of the upper mold and the lower mold are matched for self-centering and accurate positioning, the upper mold cavity and the lower mold cavity are processed through the tooling fixture at one time, and the processing error of the mold cavity can be 0-0.001 mm.
When the ultra-precise mold is used for casting a product, the upper mold and the lower mold are closed through the two-degree conical surface, the precise positioning effect is achieved, the precise positioning of the mold cavity can be controlled, the position error of the upper mold cavity and the lower mold cavity is 0-0.001 mm, the production and technical requirements of the ultra-precise mold cavity are met, the casting quality of the product is improved, and the production efficiency is improved.
The above description is further detailed in connection with the preferred embodiments of the present invention, and it is not intended to limit the practice of the invention to these descriptions. It will be apparent to those skilled in the art that various modifications, additions, substitutions, and the like can be made without departing from the spirit of the invention.
Claims (10)
1. A method for processing an ultra-precise die is characterized by comprising the following steps: the method comprises the following steps:
s1: determining the position: determining the assembly positioning relation of the lower die, the upper die sleeve and the inner cavity of the upper die and the position requirements of the upper die cavity and the lower die cavity;
s2: determining a matching structure: determining the matching structure of the upper die and the lower die to play a self-centering role in angle matching, wherein the angle matching is that the conical column of the lower die is matched with the conical hole of the upper die sleeve;
s3: processing the parts: respectively processing an upper die sleeve, an upper die inner cavity and a lower die, processing the upper die sleeve, and clamping and processing a cylindrical hole and a taper hole of the upper die sleeve on an inner hole grinding machine at one time to ensure that the coaxiality is within 0.001 mm; processing an inner cavity of the upper die, wherein the diameter of a cylinder of the upper die sleeve is used as a reference dimension A, and the outer diameter dimension of the inner cavity of the upper die is determined to be A + interference magnitude of 0.007-0.008 mm for post-processing; processing a lower die, namely processing a conical column matched with the conical hole of the upper die sleeve at the upper end of the lower die;
s4: processing a tooling fixture: manufacturing a tool fixture with the same size as the cylindrical aperture and the conical aperture of the upper die sleeve;
s5: processing a die cavity and a pin hole: the tool fixture is connected with the inner cavity of the upper die in a hot-assembling mode according to the technical requirements of products, the tool fixture is assembled with the lower die according to the position requirements, the inner cavity of the upper die and the lower die are automatically centered, the tool fixture, the inner cavity of the upper die and the lower die are placed on a linear cutting machine to process a die cavity once after being assembled, the position degree and the size precision are guaranteed, and after the die cavity is processed, a positioning pin hole is processed on the lower die, and the position consistency is guaranteed;
s6: disassembling: after the die cavity and the positioning pin hole are machined, separating the tool fixture from the lower die, and slightly knocking the inner cavity of the upper die out of the tool fixture by using a copper hammer;
s7: assembling: and performing hot-charging connection on the upper die sleeve and the inner cavity of the upper die according to the technical requirements of products.
2. The method for processing an ultra-precision mold according to claim 1, wherein: in S2, the contact area of the conical column of the lower die and the conical hole matching surface of the upper die sleeve is larger than 80%, the circle center is automatically locked after matching, and the height tolerance of the bottom surface of the lower die and the top surface of the upper die sleeve is 0-0.01 mm.
3. The method for processing an ultra-precision mold according to claim 1, wherein: in S3, the upper die is sleeved and clamped on the inner hole grinding machine, the upper die is sleeved and clamped after semi-finishing the cylindrical hole, the grinding workbench rotates for two degrees and then continues rough machining and semi-finishing the conical hole, then the grinding workbench rotates to zero degree and then finishes the cylindrical hole, and then the grinding workbench rotates to finish the conical hole with two degrees.
4. The method for processing an ultra-precision mold according to claim 1, wherein: in S5, the tool fixture is connected with the upper die inner cavity in a hot-assembling mode, namely, the tool fixture is heated to 100-150 ℃ in the electric furnace, and then the upper die inner cavity is placed into the tool fixture according to requirements and then cooled.
5. The method for processing an ultra-precision mold according to claim 1, wherein: in S5, the coaxiality of the lower die and the inner cavity of the upper die assembled together by the tool is within 0.001 mm.
6. The method for processing an ultra-precision mold according to claim 1, wherein: in S5, the die cavity machining ensures that the position degree is consistent, and the error is between 0 mm and 0.001 mm.
7. The method for processing an ultra-precision mold according to claim 1, wherein: in S7, the upper die sleeve and the upper die inner cavity are connected in a hot-fit mode, namely the upper die sleeve is heated to 100-150 ℃ in an electric furnace and then is placed into the upper die sleeve according to the position direction requirement and then is cooled.
8. An ultra-precision mold based on the ultra-precision mold machining method according to claim 1, comprising a lower mold and an upper mold, characterized in that: the improved die comprises a lower die and is characterized in that a lower die base plate is arranged at the bottom of the lower die, a two-degree conical column is arranged at the upper end of the lower die, a lower die cavity is formed in the lower die, the upper die comprises an upper die sleeve and an upper die inner cavity, a cylindrical hole and a two-degree conical hole are formed in the upper die sleeve, the cylindrical hole and the two-degree conical hole are coaxial, the upper die sleeve is in interference connection with the upper die inner cavity, the upper die inner cavity is coaxial with the cylindrical hole and the two-degree conical hole, the two-degree conical hole of the upper die sleeve is connected with the two-degree conical column of the lower die in a conical surface fit mode, an upper die cavity is formed in the upper die inner cavity, the upper die cavity and the lower.
9. The ultra-precision mold of claim 8, wherein: and the coaxiality of the cylindrical hole, the two-degree taper hole and the inner cavity of the upper die sleeve is within 0.001 mm.
10. The ultra-precision mold of claim 8, wherein: the position error of the upper die cavity and the lower die cavity is 0-0.001 mm.
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| CN113146933A (en) * | 2021-04-11 | 2021-07-23 | 陕西宝成航空仪表有限责任公司 | Precision machining molding module of miniature power transmission assembly |
| CN113399943A (en) * | 2021-06-15 | 2021-09-17 | 成都市联余精密机械有限公司 | Processing technology for solving problem of coarse seaming line of PET bottle preform |
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| CN113399943B (en) * | 2021-06-15 | 2022-08-26 | 成都市联余精密机械有限公司 | Processing technology for solving problem of coarse seaming line of PET bottle preform |
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| CN111283385B (en) | 2021-09-17 |
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