CN103464751B - A kind of die for injection molding being unfavorable for producing molten trace - Google Patents
A kind of die for injection molding being unfavorable for producing molten trace Download PDFInfo
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- CN103464751B CN103464751B CN201310374626.4A CN201310374626A CN103464751B CN 103464751 B CN103464751 B CN 103464751B CN 201310374626 A CN201310374626 A CN 201310374626A CN 103464751 B CN103464751 B CN 103464751B
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- pressurize passage
- cover half
- pressurize
- cross gate
- die
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Abstract
The present invention provides a kind of die for injection molding being unfavorable for producing molten trace, comprise dynamic model seat and cover half seat with matching, described dynamic model seat and cover half seat form cast parts die cavity after closing mould, described cover half seat is offered and the cross gate that described cast parts mold cavity is connected, it is characterized in that: described cover half seat is also offered the first pressurize passage being all connected with described cross gate inside and the 2nd pressurize passage near the position of described cast parts die cavity, being respectively equipped with in described first pressurize passage and the 2nd pressurize passage can along the respective reciprocating first piston of pressurize passage axis and the 2nd piston. a kind of die for injection molding being unfavorable for producing molten trace of the present invention, the pressurize passage being connected with cross gate inside by offering on cover half seat, the to-and-fro movement of piston is to the certain pressure of cast parts die cavity thus creates unfavourable condition to the generation of molten trace, solves outward appearance that cast parts product brings and the bad problem of mechanical property because melting trace.
Description
Technical field
The present invention relates to a kind of mould for metal powder injection molding, it is specifically related to a kind of mould being unfavorable for producing molten trace, belongs to powder metallurgical technology.
Background technology
Metal Injection Molding is Novel powder metallurgy forming technique modern plastics injection molding technology introduced field of powder metallurgy and is formed. Its basic craft course is: first by evenly mixing to pressed powder and organic adhesive, under heating plasticizing state, curing molding in mould cavity is injected with injection moulding machine after granulating, then remove becoming the caking agent in parison to take off by the method for chemistry or thermolysis, obtain the finished product finally by sintering densification. Compared with traditional technology, there is the features such as precision height, homogeneous microstructure, excellent performance, production cost are low, it is particularly suitable for producing in enormous quantities the structural parts of small-sized three-dimensional complex structure.
In process of injection molding, after pressurize terminates, plunger or screw rod retreat, pressure releases in die cavity, at this moment when melt flows through inserts in die cavity, the flow velocity of melt, streamline and temperature all can change, at this moment melt easily produces welding trace in intersection, outward appearance and mechanical property such as the tensile strength etc. of cast parts product all can be produced impact in various degree by the generation of welding trace, mould is the key in plastic parts moulding technique, therefore, the object of the present invention is exactly go out the welding trace sent and reduce and even eliminate moulding process and produce from the structure of mould.
Summary of the invention
In order to the deficiency solved in background technology, it is an object of the invention to overcome the defect of background technology, it is provided that a kind of structure is simple, the die for injection molding that is unfavorable for producing molten trace.
For achieving the above object, the technical solution used in the present invention is: a kind of die for injection molding being unfavorable for producing molten trace, comprise dynamic model seat and cover half seat with matching, described dynamic model seat and cover half seat form cast parts die cavity after closing mould, described cover half seat is offered and the cross gate that described cast parts mold cavity is connected, it is characterized in that: described cover half seat is also offered the first pressurize passage being all connected with described cross gate inside and the 2nd pressurize passage near the position of described cast parts die cavity, being respectively equipped with in described first pressurize passage and the 2nd pressurize passage can along the respective reciprocating first piston of pressurize passage axis and the 2nd piston.
In a preferred embodiment of the present invention, comprise described first pressurize passage further and the 2nd pressurize passage is all inclined in described cover half seat relative to described cross gate, and described first pressurize passage and the 2nd pressurize passage are symmetrical arranged relative to described cross gate.
In a preferred embodiment of the present invention, the angle comprised further between the axis of described first pressurize passage and the axis of described cross gate is 10-45 ��.
In a preferred embodiment of the present invention, the angle comprised further between the axis of described first pressurize passage and the axis of described cross gate is 30 ��.
In a preferred embodiment of the present invention, the width comprising described first pressurize passage and the 2nd pressurize passage further is 3/5ths of described cross gate width.
In a preferred embodiment of the present invention, comprise the mid-way that described cross gate is positioned at described cover half seat further.
The usefulness of the present invention is: a kind of die for injection molding being unfavorable for producing molten trace of the present invention, the pressurize passage being connected with cross gate inside by offering on cover half seat, piston in pressurize passage to-and-fro movement until the complete cooling curing of melt in cast parts die cavity, the to-and-fro movement of piston is to the certain pressure of cast parts die cavity thus creates unfavourable condition to the generation of molten trace, can obtain, by the reciprocating frequency of control piston, the moulding that performance is greatly improved in the flowing direction. Relative to traditional mould, there is novel structure, practical advantage, it is beneficial to and promotes the use of.
Figure of description
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Fig. 1 is a kind of structural representation being unfavorable for producing the die for injection molding of molten trace of the present invention;
Fig. 2 is that the first piston of the present invention and the 2nd piston are to the exploded view of the thrust in the moving process of cross gate direction.
In figure: 2, dynamic model seat, 4, cover half seat, 6, cast parts die cavity, 8, cross gate, the 10, first pressurize passage, the 12, the 2nd pressurize passage, 14, first piston, the 16, the 2nd piston.
Embodiment
In order to make those skilled in the art understand the present invention program better, and the above-mentioned purpose of the present invention, feature and advantage being become apparent more, below in conjunction with embodiment and embodiment accompanying drawing, the present invention is further detailed explanation.
As shown in Figure 1, a kind of die for injection molding being unfavorable for producing molten trace, comprise dynamic model seat 2 and cover half seat 4 with matching, dynamic model seat 2 and cover half seat 4 form cast parts die cavity 6 after closing mould, cover half seat 4 is offered and the cross gate 8 that cast parts die cavity 6 inside is connected, wherein, cover half seat 4 is also offered the first pressurize path 10 being all connected with cross gate 8 inside and the 2nd pressurize passage 12 near the position of cast parts die cavity 6, be separately positioned in the first pressurize path 10 and the 2nd pressurize passage 12 and can along the reciprocating first piston 14 of respective pressurize passage axis and the 2nd piston 16. the to-and-fro movement in the first pressurize path 10 and the 2nd pressurize passage 12 by first piston 14 and the 2nd piston 16, thrust is converted into the pressure of melt in cast parts die cavity 6 by piston motion, thus the generation giving molten trace creates unfavourable condition, reach the object reducing and even removing molten trace.
Concrete, first pressurize path 10 and the 2nd pressurize passage 12 are all inclined in cover half seat 4 relative to cross gate 8, and first pressurize path 10 and the 2nd pressurize passage 12 be symmetrical arranged relative to cross gate 8, concrete, see Fig. 2 decomposition of force, when first piston 14 moves to cross gate 8 direction, the power of oblique lower section is decomposed into a level power F1 to the left and power F2 vertically downward, F1 changes into the force value of melt, when 2nd piston 16 moves to cross gate 8 direction, power obliquely is decomposed into a level power F3 and power F4 vertically upward to the left, F3 is converted into the force value of melt, F2 and F4 size is equal, direction is contrary, cancel out each other, the power acted in vertical direction is made to be zero.
In order to the thrust by piston motion maximum be converted into the force value of melt, angle between the axis of the first pressurize path 10 and the axis of cross gate 8 is 10-45 ��, preferably 30 ��, on the basis that the first pressurize path 10 is easily processed, 30 �� is the maximum angle of transfer pressure value, it is achieved that reach the object of best technique effect with the simplest structure.
Draw through test repeatedly, pressurize best results when the width of the first pressurize path 10 and the 2nd pressurize passage 12 is 3/5ths of cross gate 8 width.
In order to make the melt in cast parts die cavity 6 evenly solidify, cross gate 8 is arranged on the mid-way of cover half seat 4.
Above-described embodiment is that the present invention preferably implements mode; but embodiments of the present invention are not limited by the examples; the change done under the spirit of other any the present invention of not deviating from and principle, modification, replacement, combination, simplification all should be the substitute mode of equivalence, are included within protection scope of the present invention. Therefore, protection scope of the present invention should be as the criterion with the protection domain that claim defines.
Claims (5)
1. one kind is unfavorable for producing the die for injection molding of molten trace, comprise dynamic model seat and cover half seat with matching, described dynamic model seat and cover half seat form cast parts die cavity after closing mould, described cover half seat is offered and the cross gate that described cast parts mold cavity is connected, it is characterized in that: described cover half seat is also offered the first pressurize passage being all connected with described cross gate inside and the 2nd pressurize passage near the position of described cast parts die cavity, being respectively equipped with in described first pressurize passage and the 2nd pressurize passage can along the respective reciprocating first piston of pressurize passage axis and the 2nd piston, described first pressurize passage and the 2nd pressurize passage are all inclined in described cover half seat relative to described cross gate, and described first pressurize passage and the 2nd pressurize passage are symmetrical arranged relative to described cross gate.
2. a kind of die for injection molding being unfavorable for producing molten trace according to claim 1, it is characterised in that: the angle between the axis of described first pressurize passage and the axis of described cross gate is 10-45 ��.
3. a kind of die for injection molding being unfavorable for producing molten trace according to claim 2, it is characterised in that: the angle between the axis of described first pressurize passage and the axis of described cross gate is 30 ��.
4. a kind of die for injection molding being unfavorable for producing molten trace according to claim 3, it is characterised in that: the width of described first pressurize passage and the 2nd pressurize passage is 3/5ths of described cross gate width.
5. a kind of die for injection molding being unfavorable for producing molten trace according to claim 4, it is characterised in that: described cross gate is positioned at the mid-way of described cover half seat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310374626.4A CN103464751B (en) | 2013-08-26 | 2013-08-26 | A kind of die for injection molding being unfavorable for producing molten trace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310374626.4A CN103464751B (en) | 2013-08-26 | 2013-08-26 | A kind of die for injection molding being unfavorable for producing molten trace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103464751A CN103464751A (en) | 2013-12-25 |
| CN103464751B true CN103464751B (en) | 2016-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310374626.4A Active CN103464751B (en) | 2013-08-26 | 2013-08-26 | A kind of die for injection molding being unfavorable for producing molten trace |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201272000Y (en) * | 2008-07-25 | 2009-07-15 | 夏善海 | Independent pressure maintaining mechanism of injection moulding machine |
| CN102529022A (en) * | 2012-02-15 | 2012-07-04 | 河北华强科技开发有限公司 | Plastic modified production unit |
| CN202668924U (en) * | 2012-06-08 | 2013-01-16 | 广州一道注塑机械有限公司 | Injection system with pressure maintaining function |
| CN202826304U (en) * | 2012-09-06 | 2013-03-27 | 戴桂芬 | Injection moulding device |
| CN203495226U (en) * | 2013-08-26 | 2014-03-26 | 苏州米莫金属科技有限公司 | Injection moulding die unfavorable for melted mark generation |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6474399B2 (en) * | 1998-03-31 | 2002-11-05 | Takata Corporation | Injection molding method and apparatus with reduced piston leakage |
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2013
- 2013-08-26 CN CN201310374626.4A patent/CN103464751B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201272000Y (en) * | 2008-07-25 | 2009-07-15 | 夏善海 | Independent pressure maintaining mechanism of injection moulding machine |
| CN102529022A (en) * | 2012-02-15 | 2012-07-04 | 河北华强科技开发有限公司 | Plastic modified production unit |
| CN202668924U (en) * | 2012-06-08 | 2013-01-16 | 广州一道注塑机械有限公司 | Injection system with pressure maintaining function |
| CN202826304U (en) * | 2012-09-06 | 2013-03-27 | 戴桂芬 | Injection moulding device |
| CN203495226U (en) * | 2013-08-26 | 2014-03-26 | 苏州米莫金属科技有限公司 | Injection moulding die unfavorable for melted mark generation |
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| CN103464751A (en) | 2013-12-25 |
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