CN112936760B - Mold pouring system for high-precision miniature power transmission ring process bushing forming - Google Patents
Mold pouring system for high-precision miniature power transmission ring process bushing forming Download PDFInfo
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- CN112936760B CN112936760B CN202110176388.0A CN202110176388A CN112936760B CN 112936760 B CN112936760 B CN 112936760B CN 202110176388 A CN202110176388 A CN 202110176388A CN 112936760 B CN112936760 B CN 112936760B
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 230000005540 biological transmission Effects 0.000 title claims abstract description 22
- 238000001816 cooling Methods 0.000 claims abstract description 23
- 238000001746 injection moulding Methods 0.000 claims abstract description 21
- 238000009826 distribution Methods 0.000 claims abstract description 8
- 238000000465 moulding Methods 0.000 claims description 7
- 238000005516 engineering process Methods 0.000 claims description 6
- 238000007493 shaping process Methods 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 4
- 230000007547 defect Effects 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 18
- 238000004458 analytical method Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 4
- 238000012797 qualification Methods 0.000 abstract description 4
- 239000000047 product Substances 0.000 description 16
- 230000008602 contraction Effects 0.000 description 9
- 238000012360 testing method Methods 0.000 description 7
- 238000010276 construction Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
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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
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2701—Details not specific to hot or cold runner channels
- B29C45/2708—Gates
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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
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2735—Sprue channels ; Runner channels or runner nozzles for non-coaxial gates, e.g. for edge gates
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- 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
- B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention provides a mold pouring system for forming a high-precision miniature power transmission ring process bushing, which is characterized in that an innovative experimental mold pouring system design and analysis method is carried out on a precision assembly process bushing, the position of a pouring gate, the size of the pouring gate and a feeding mode of the mold pouring system are improved, a feeding hole is arranged at one end of a saddle-shaped forming cavity, and a large central pouring gate in the prior art is improved into a material hole at the end part of a part to change the internal stress distribution of cooling shrinkage of the part, reduce or eliminate the injection molding deformation state of a plastic part, improve the qualification rate of the injection molding assembly process bushing, and enable the injection molding part to meet the requirements of product design and assembly.
Description
Technical Field
The invention belongs to the technical field of molds, and particularly relates to a mold casting system for forming a high-precision miniature power transmission ring process bushing, which is suitable for the design of a high-precision saddle-shaped part mold casting system, and an analysis method has universal applicability.
Background
The miniature precision power transmission conducting ring assembly is a core power transmission assembly of certain equipment, and the assembly and the machining forming of the miniature precision power transmission conducting ring assembly are realized through an assembly process bushing. In the existing practical production, the assembly process bushing always adopts the related die forming technology of 50 years, wherein the structure of the assembly process bushing is basically similar to that shown in fig. 7 and 8, and only the positioning grooves are different in number, the more the positioning grooves are, the greater the warping deformation is; as shown in fig. 9 and 10, the distance dimension and the length dimension cannot meet the product design requirements throughout the year, the warping deformation is related to the cooling temperature gradient and the gate position of the injection molding part, the size and the direction of the internal stress are related to the cooling temperature gradient direction, the higher the temperature gradient is, the larger the internal stress is, the direction is the same as the basic temperature gradient, and the structure of the part is related to the cooling speed; fig. 11 and 12 show schematic diagrams of analyzing the temperature gradient of the plastic part cooling process, wherein the temperature gradient is basically consistent with the deformation degree of the plastic part; the molding structure of the related conventional mold is shown in fig. 13 and 14. The original bushing mold and the pouring system are introduced according to traditional textbooks and professional reference data of various mold designs, and generally only the size of a pouring gate and the arrangement form of the pouring gate are introduced, and the influence of the pouring gate and the position on the molding of an injection molding part is rarely introduced. The design of the mold since the original 50 s is designed by a central large gate, as shown in fig. 14, the size is unstable, feeding is easy to fill, molding is easy, left and right balance is realized, the part is saddle-shaped, the bottom of the part is opened, the size of the part of the product is analyzed in an out-of-tolerance way in the past, the large gate and the position cause heat concentration around the part and the gate, the cooling speed is uneven, the material flowability is poor in the cooling and solidification process around the gate part, effective cold shrinkage material supplement is difficult to form, large shrinkage internal stress is formed around the gate, the part is warped and deformed, and the assembly and processing qualification rate of subsequent product components is low. Therefore, the problem that the original assembly process bushing always has large warping deformation and part of key dimensions cannot meet the design requirements of products is solved. In the past, the feeding and position test of a central large gate is improved, and a side-cut small gate is designed at the top of one end of the saddle shape for testing, as shown in fig. 15, although the bending deformation of an injection molding part is greatly improved by changing the position and the direction of the gate and changing the position and the direction of the internal stress of cooling shrinkage, the design requirement of a product cannot be met. There is therefore a need for improvements.
Disclosure of Invention
The technical problem solved by the invention is as follows: the invention provides a mold pouring system for forming a high-precision miniature power transmission ring process bushing, which is designed aiming at a precise assembly process bushing to carry out innovation experimental mold pouring system, improves the pouring gate position, the pouring gate size and the feeding mode of the mold pouring system, improves the central large pouring gate in the prior art into the feeding of two points at the end part of a part and side-cut feeding ports by arranging two side-cut feeding ports at one third position at two sides of a female die at one end of a saddle-shaped forming cavity, changes the position and the direction of the temperature gradient change of part cooling and the flow direction parameter of injection molding plastic, changes the internal stress deformation of part cooling contraction into the linear distribution and deformation of the contraction in the length direction, reduces the internal stress of the part cooling contraction, reduces or eliminates the deformation and the warping of the injection molding of the plastic, improves the qualification rate of the injection assembly process bushing, and enables the injection molding to meet the requirements of product design and assembly.
The technical scheme adopted by the invention is as follows: a mould gating system for miniature transmission of electricity of high accuracy ring technology bush shaping, including the backing plate, the fixed plate that is equipped with in backing plate upper portion, the inside center of fixed plate is equipped with the ejector, ejector and fixed plate upper portion center are equipped with the core, fixed plate upper portion is equipped with the die, form the saddle shape molding die cavity that is used for the miniature transmission of electricity of shaping saddle part ring technology bush between die lower part cavity and the core on the die and be in saddle shape molding die cavity one end department and be equipped with the side and cut little runner feeding type and water the structure, through the side is cut little runner feeding type and is watered the internal stress deformation that the position that the structure feeding has changed saddle part refrigerated temperature gradient changes and direction, is made the length direction shrink of part cooling shrink and change into the linear distribution and the deformation of the length direction shrink of being convenient for control, eliminates to mould a piece injection and mould and become the warping shape defect.
The technical scheme is further limited, the side-cut small sprue feeding type pouring gate structure comprises a main pouring gate, a branch pouring gate and side-cut feeding ports, the main pouring gate is arranged at the top of a female die at one end of the saddle-shaped forming cavity, the side-cut feeding ports are provided with two and are respectively arranged at one third positions of two sides of one end of the saddle-shaped forming cavity, the branch pouring gate is also provided with two, and each side-cut feeding port is communicated with the main pouring gate through the corresponding branch pouring gate.
The technical scheme is further limited, the core is positioned between the cylindrical positioning pin and the fixing plate, a positioning pin hole I is formed in one end of the core, a positioning pin hole II is also formed in the corresponding position of the fixing plate, and the cylindrical positioning pin penetrates through the positioning pin hole I and the positioning pin hole II to position the core and the fixing plate.
The technical scheme is further limited, a square shoulder structure is arranged at the lower part of the ejector, and a return spring is arranged between the square shoulder structure and the corresponding surface of the inner cavity of the fixed plate.
In the further limitation of the technical scheme, the fixing plate is fixedly connected with the backing plate through screws.
Compared with the prior art, the invention has the advantages that:
1. the scheme aims at a precise assembly process bushing to carry out innovative experimental mold pouring system design, the core of the design is to improve an injection molding pouring system, through analysis and test, the pouring gate position, the pouring gate size and the feeding mode of the mold pouring system are improved, a central large pouring gate in the prior art is improved into two points at the end part of a part and the feeding of a side-cut feeding port, specifically, a small-cut pouring gate feeding type pouring gate structure consisting of a main pouring gate, a branch pouring gate and a side-cut feeding port is arranged on a female die and at one end of a saddle-shaped forming cavity, the main pouring gate is arranged at the top of the female die at one end of the saddle-shaped forming cavity, the side-cut feeding port is provided with two small-cut pouring gate feeding type pouring gates respectively arranged at one third positions at two sides of the saddle-shaped forming cavity, each side-cut feeding port is communicated with the main pouring gate through the corresponding branch pouring gate, the scheme realizes the branch pouring gate and the notch feeding through the female die, changes the position and the direction of the temperature gradient change of part cooling and the injection molding plastic flow direction parameters, the internal stress deformation of the part cooling shrinkage is changed into linear distribution and deformation of the length direction shrinkage, the linear distribution and the deformation of the length direction shrinkage, the part is convenient to design and control the shrinkage, the warping of the injection molding process bushing, and the injection molding assembly process bushing is improved, and the qualified injection molding assembly process bushing, and the qualified injection molding assembly process bushing;
2. the test mould is analyzed by multiple sets of moulds for three consecutive years, and a mould pouring system is innovatively improved, so that two continuous mould tests are successful, and the test verifies that the pouring system has stability and sustainability, so that the main and key sizes of the formed saddle-shaped part can all meet the requirements of a product design drawing.
Drawings
FIG. 1 is a front view of the construction of the mold gating system of the present invention;
FIG. 2 is a left side view of the construction of the mold gating system of the present invention;
FIG. 3 is a top view of the construction of the mold gating system of the present invention;
FIG. 4 is an enlarged view of the portion I shown in FIG. 3 according to the present invention;
FIG. 5 is a top view of the structure of the side-cut gate runner structure of the present invention
FIG. 6 is a bottom view of FIG. 5 of the present invention;
fig. 7 is a front view of a product micro power transmission ring process liner;
fig. 8 isbase:Sub>A view of the product micro power transmission ring process liner shown in fig. 7 in directionbase:Sub>A-base:Sub>A;
fig. 9 is a perspective view of a product micro power transmission ring process liner after deformation;
fig. 10 is a front view of a product micro power transmission ring process liner after deformation;
fig. 11 is a temperature gradient perspective view of the cooling process of the process liner plastic part of the product micro power transmission ring;
fig. 12 is a front view of the temperature gradient during cooling of the process liner plastic of the product micro power transmission ring;
FIG. 13 is a front view of a prior art mold structure;
FIG. 14 is a left side view of a prior art mold structure;
fig. 15 is a structural diagram of a mold in the prior art, wherein a side-cut small gate is designed at one end of a saddle shape.
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.
It should be noted that, in this document, 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. Without further limitation. The use of the phrase "comprising one of the elements" does not exclude the presence of other like elements in the process, method, article, or apparatus that comprises the element.
Referring to fig. 1-6, embodiments of the present invention are described in detail.
A mould gating system for miniature transmission ring technology bush shaping of high accuracy, as shown in fig. 1, 2, 3, including backing plate 1, backing plate 1 upper portion is fixed and is equipped with fixed plate 2, pass through screw 9 fixed connection between fixed plate 2 and the backing plate 1. An ejector 3 is arranged in the center of the inner part of the fixed plate 2, and the ejector 3 is used for ejecting a formed part; the lower part of the ejector 3 is provided with a square shoulder structure, a return spring 8 is arranged between the square shoulder structure and the corresponding surface of the inner cavity of the fixed plate 2, and the return spring 8 enables the ejector 3 to restore to the original position.
And a mold core 4 is arranged at the centers of the upper parts of the ejector 3 and the fixed plate 2, and the mold core 4 is positioned between the cylindrical positioning pin 10 and the fixed plate 2. Specifically, 4 one ends of core are equipped with registration pin hole I11, the department that corresponds the position on fixed plate 2 also is equipped with registration pin hole II 12, cylindrical locating pin 10 passes and realizes the location between core 4 and fixed plate 2 in registration pin hole I11 and registration pin hole II 12.
And a concave die 5 is arranged at the upper part of the fixing plate 2, and a saddle-shaped forming cavity 6 for forming a saddle-shaped part micro power transmission ring process bushing is formed between a concave cavity at the lower part of the concave die 6 and the mold core 4.
The die 6 is provided with a side-cut small gate feeding type pouring structure 7 at one end of the saddle-shaped forming cavity 6, and the side-cut small gate feeding type pouring structure 7 is used for feeding materials to change the position and direction of the temperature gradient change of saddle-shaped part cooling and change the internal stress deformation of part cooling contraction into the linear distribution and deformation of the length direction contraction convenient to control, so that the defect that the plastic part injection deformation warping is overcome.
Specifically, the side-cut small gate feeding type pouring gate structure 7 comprises a main pouring gate 7-1, a branch pouring gate 7-2 and side-cut feeding ports 7-3, the main pouring gate 7-1 is arranged at the top of a female die 6 at one end of a saddle-shaped forming cavity 6, the side-cut feeding ports 7-3 are provided with two side-cut feeding ports and are respectively arranged at one third of the two sides of one end of the saddle-shaped forming cavity 6, the branch pouring gate 7-2 is also provided with two side-cut feeding ports, and each side-cut feeding port 7-3 is communicated with the main pouring gate 7-1 through the corresponding branch pouring gate 7-2.
The invention carries out innovative experimental mold pouring system design aiming at a precise assembly process bushing, the core of the design is to improve an injection molding pouring system, the position of a pouring gate, the size of the pouring gate and the feeding mode of the mold pouring system are improved through analysis and test, the central large pouring gate in the prior art is improved into the feeding of two points at the end part of a part and a side-cut feeding port, the side-cut feeding port is arranged at one third position at two sides of a female die at one end of a saddle-shaped forming cavity, the feeding of a branch pouring gate and a notch is realized, the position and the direction of the temperature gradient change of part cooling and the flow direction parameter of injection molding plastic are changed, the internal stress deformation of the part cooling contraction is changed into the linear distribution and the deformation of the length direction contraction, the internal stress of the part cooling contraction is reduced, the design and the contraction are convenient, the deformation warping of the injection molding of the plastic part is reduced or eliminated, the qualification rate of the injection molding process bushing is improved, and the injection molding part reaches the product design and the assembly requirements.
The embodiment is subjected to die design and production verification of different products with similar structures twice, so that the formed saddle-shaped size is ensured
The control is within 1/3 of the original tolerance, the dimension L1 is within 1/4 of the original tolerance, the requirements of the product assembly process for the bushing and the dimensional accuracy are met, and the pouring system has stability and reliability.
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 specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it is to be understood that all embodiments may be combined as appropriate by one of ordinary skill in the art to form other embodiments as will be apparent to those of skill in the art from the description herein.
Claims (3)
1. A mould gating system for miniature transmission of electricity of high accuracy ring technology bush shaping, including backing plate (1), fixed plate (2) that are equipped with in backing plate (1) upper portion, fixed plate (2) inside center is equipped with ejector (3), ejector (3) and fixed plate (2) upper portion center are equipped with core (4), fixed plate (2) upper portion is equipped with die (5), form between die (5) lower part cavity and core (4) and be used for the miniature transmission of electricity of shaping saddle shape part ring technology bush saddle shape shaping die cavity (6), its characterized in that: a side-cut small-sprue feeding type pouring gate structure (7) is arranged on the female die (5) and at one end of the saddle-shaped forming cavity (6), the position and the direction of the temperature gradient change of saddle-shaped part cooling are changed through feeding of the side-cut small-sprue feeding type pouring gate structure (7), the internal stress deformation of part cooling shrinkage is changed into the linear distribution and deformation of the shrinkage in the length direction which are convenient to control, and the defect of warping and deformation of injection molding of a plastic part is eliminated;
the side-cut small sprue feeding type pouring gate structure (7) comprises a main pouring gate (7-1), branch pouring gates (7-2) and side-cut feeding ports (7-3), wherein the main pouring gate (7-1) is arranged at the top of a female die (5) at one end of a saddle-shaped forming cavity (6), the side-cut feeding ports (7-3) are provided with two parts which are respectively arranged at one third position of two sides of one end of the saddle-shaped forming cavity (6), the branch pouring gates (7-2) are also provided with two parts, and each side-cut feeding port (7-3) is communicated with the main pouring gate (7-1) through the corresponding branch pouring gate (7-2);
the positioning device is characterized in that the positioning of the mold core (4) is realized between the cylindrical positioning pin (10) and the fixing plate (2), one end of the mold core (4) is provided with a positioning pin hole I (11), a corresponding position on the fixing plate (2) is also provided with a positioning pin hole II (12), and the cylindrical positioning pin (10) penetrates through the positioning pin hole I (11) and the positioning pin hole II (12) to realize the positioning between the mold core (4) and the fixing plate (2).
2. The mold gating system for high precision miniature power transmission ring process liner molding of claim 1, wherein: the lower part of the ejector (3) is provided with a square shoulder structure, and a return spring (8) is arranged between the square shoulder structure and the corresponding surface of the inner cavity of the fixing plate (2).
3. The mold gating system for high precision miniature power transmission ring process liner molding of claim 1, wherein: the fixing plate (2) is fixedly connected with the backing plate (1) through a screw (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110176388.0A CN112936760B (en) | 2021-02-07 | 2021-02-07 | Mold pouring system for high-precision miniature power transmission ring process bushing forming |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110176388.0A CN112936760B (en) | 2021-02-07 | 2021-02-07 | Mold pouring system for high-precision miniature power transmission ring process bushing forming |
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| CN112936760A CN112936760A (en) | 2021-06-11 |
| CN112936760B true CN112936760B (en) | 2023-04-18 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102049472A (en) * | 2009-11-03 | 2011-05-11 | 上海航天精密机械研究所 | Method for casting special case casting core mould |
| CN104174833B (en) * | 2014-08-06 | 2016-09-14 | 佳木斯大学 | A kind of production technology of the wear-resisting thin plate of double-fluid double metal composite casting |
| CN204749143U (en) * | 2015-06-12 | 2015-11-11 | 陕西宝成航空仪表有限责任公司 | A the gating system for injection mold kazakhstan husband's mode structure |
| CN204955304U (en) * | 2015-09-21 | 2016-01-13 | 云南省机械研究设计院 | Side gate the gating system is used in asymmetric monotype chamber |
| CN109648791A (en) * | 2018-12-05 | 2019-04-19 | 贵州航天电子科技有限公司 | A kind of PE plastic product forming injection moulding apparatus |
| CN112123699B (en) * | 2020-09-03 | 2022-06-14 | 深圳市志成金科技有限公司 | Side glue feeding hot nozzle and injection molding glue feeding system |
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