CN211763076U - Pen box injection mold's cold burden well structure - Google Patents
Pen box injection mold's cold burden well structure Download PDFInfo
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- CN211763076U CN211763076U CN201921465346.3U CN201921465346U CN211763076U CN 211763076 U CN211763076 U CN 211763076U CN 201921465346 U CN201921465346 U CN 201921465346U CN 211763076 U CN211763076 U CN 211763076U
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- flow baffle
- half cavity
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Abstract
A cold material well structure of a pen box injection mold comprises a fixed mold and a movable mold, wherein the movable mold and the movable mold are matched to form a mold cavity, a main flow channel is arranged in the fixed mold and is communicated with the mold cavity, the movable mold is provided with a cold material well at a position right opposite to the main flow channel, a push rod hole is formed in the movable mold, a push rod for ejecting cold materials in the cold material well is arranged in the push rod hole in a sliding manner, a flow baffle plate is arranged in the push rod hole in a radial direction and divides the push rod hole into a left half cavity and a right half cavity, one end of the flow baffle plate extends to the inner wall of the push rod hole to divide the left half cavity and the right half cavity, a gap is reserved between the other end of the flow baffle plate and the inner wall of the push rod hole, the gap forms an overflow channel, a sliding groove matched with the shape of the flow baffle plate is arranged on the push rod, the sliding groove is in sliding fit with the flow baffle plate, the left half, and after the pioneer melt is filled in the left half cavity, the pioneer melt enters the right half cavity through the overflow channel.
Description
Technical Field
The utility model relates to an injection mold technical field, concretely relates to pen box injection mold's cold burden well structure.
Background
In an injection mold, because the temperature of molten plastic at the forefront end of a nozzle is low, the plastic is easy to solidify into a solidified or semi-solidified state during a product molding injection interval, the solidified or semi-solidified state plastic is a cold material, when the cold material enters a mold cavity, a flow channel is easy to block, the flow speed of a molten material is slowed down, when the cold material is mixed into a product, the surface gloss of the product is poor, cold material mark defects such as sprayed lines, material flowers, surface floating fibers and the like are generated, the defects seriously affect the surface quality of the injection molding product, and the defects cannot be covered by methods such as polishing, spraying, deplating and the like. In order to solve the problem of cold material during injection molding, a cold material well is usually disposed at the end of the main channel, and the cold material well is also called a cold material cavity, which is a structure for storing cold material to prevent the cold material from entering the mold cavity to affect the product quality and to enable the mold cavity to be smoothly filled with melt material.
In the process of injection molding production of pen box products, especially the pen box for packaging marker pens, crayons and color pens, the pen placing cavity of the pen box products is generally provided with an installation grid structure for separating all pens, the installation of various structures is thin, the groove for entering a male die through molten materials is formed, when the pen box forming products are ejected by a die, because the whole pen box finished products are thin, the ejector pins are generally arranged at the ejection products at the cold material wells of the pen box, the structure at the cold material wells is relatively thick, and the cold material wells are waste materials, the cold material wells are arranged at the edges of two ends of the pen box products, the ejector pins impact the parts, damage is caused, and the product quality cannot be influenced.
However, the method has the problems that the cold material wells and the ejector pins are generally symmetrically arranged at the two ends of the pen box and are ejected synchronously, when cold materials enter the cold material wells, the first part of the cold materials may be solidified or semi-solidified and cannot fall into the bottom of the cold material wells completely, gaps are formed in the cold material wells, if unequal gaps are formed in the cold material wells at the two sides, even if the symmetrical ejector pins move synchronously, the distance between the ejector pins at the two sides, which are actually contacted with the respective cold material wells, is different due to the difference of the sizes of the gaps at the two sides, the ejected pen box product is inclined, the inclined angle can cause the thin mounting grid of the pen box to break when the mounting grid is separated from a mold cavity, the qualification rate of injection molding finished products is seriously affected, and broken residues are remained in the mold.
Disclosure of Invention
The utility model provides a solve the not enough of above-mentioned technique, provide a pen box injection mold's cold burden well structure. The technical scheme of the utility model: the utility model provides a pen box injection mold's cold burden well structure, injection mold includes cover half and movable mould, the movable mould forms the die cavity with the movable mould cooperation, set up the sprue in the cover half, the sprue with the die cavity intercommunication sets up, the movable mould is just right the position of sprue is provided with the cold burden well, be provided with the ejector pin hole in the movable mould, it is used for ejecting to slide in the ejector pin hole the ejector pin of cold burden in the cold burden well, its characterized in that: the ejector rod hole is internally provided with a flow baffle along the radial direction, the flow baffle divides the ejector rod hole into a left half cavity and a right half cavity, one end of the flow baffle extends to the inner wall of the ejector rod hole to divide the left half cavity and the right half cavity, a gap is reserved between the other end of the flow baffle and the inner wall of the ejector rod hole, the gap forms an overflow channel, the ejector rod is provided with a sliding groove matched with the flow baffle in shape, the sliding groove is in sliding fit with the flow baffle, the left half cavity and the end face of the ejector rod are surrounded to form a cold material well, the right half cavity and the end face of the ejector rod form a rear melt cavity, and a pioneer melt fills the left half cavity and then enters the.
Adopt above-mentioned technical scheme, cut apart the ejector pin hole through keeping off the class board, reduce the volume in half chamber on the left side for the cold charge of pioneer can touch the end as early as possible, accomplish the contact with the ejector pin terminal surface, fill full left half chamber after, the right half chamber of rethread overflow way entering, after setting up like this, between ejector pin and the cold charge well, be difficult for producing the space, the contact is accomplished with the ejector pin terminal surface to the essence of pioneer cold charge, when the stationery box finished product is ejecting, just can not have asymmetric space because of both sides, and the ejecting problem of slope appears.
The utility model discloses a further setting: the end face of the ejector rod corresponding to the left half cavity is a first end face, the end face corresponding to the right half cavity is a second end face, a step structure is arranged on the first end face, the step of the step structure close to one side of the die cavity is a starting point step, the step of the step structure close to one side of the right half cavity is an end point step, and the height of the starting point step is relatively higher than that of the end point step.
Adopt above-mentioned technical scheme, because the pioneer cold charge is in half solidification or fixed line state already, its velocity of flow can be less than follow-up melt, follow-up melt crosses the pioneer cold charge very easily in the cold charge well, this crosses the process, just produce space or gas pocket easily, set up stair structure on the adoption ejector pin, when the pioneer cold charge gets into the cold charge well, through the highest step of stair structure, accept the pioneer cold charge first, accomplish the support, even follow-up melt crosses the pioneer cold charge, also can get into next step, accomplish the contact with the ejector pin step by step, the cold charge well that forms like this laminates completely with the ejector pin, can not produce the space, when having avoided ejecting, the asynchronous problem of both sides stroke.
The utility model discloses a further setting: and a flow blocking lug is arranged on the first end surface and close to the overflow channel, and the flow blocking lug is positioned on the terminal step.
Adopt above-mentioned technical scheme, the fender stream lug that sets up avoids follow-up melt to flow into right half chamber too fast.
The utility model discloses a further setting: the cross section of the flow baffle is trapezoidal, and the end face of the flow baffle, which is close to the hollow side of the ejector rod hole, is a trapezoidal upper bottom.
The utility model discloses a further setting: and the end surface of the flow baffle close to one side of the hollow opening of the ejector rod hole is provided with an arc transition.
The utility model discloses a further setting: the cross section of the flow blocking lug is semicircular.
The utility model discloses a further setting: and all steps of the first end face stepped structure are in circular arc transition.
Drawings
Fig. 1 is a cross-sectional view of a mold according to an embodiment of the present invention;
FIG. 2 is an enlarged view of FIG. 1 at A;
FIG. 3 is a schematic diagram of a structure of a carrier rod 1 according to an embodiment of the present invention;
fig. 4 is a top rod structure diagram 2 according to the embodiment of the present invention;
fig. 5 is a top rod structure diagram 3 according to the embodiment of the present invention;
fig. 6 is a top rod structure diagram 4 according to the embodiment of the present invention.
Detailed Description
As shown in fig. 1-6, a structure of a cooling material well 5 of a pen box injection mold comprises a fixed mold and a movable mold, the movable mold and the movable mold are matched to form a mold cavity 1, a main runner is arranged in the fixed mold and is communicated with the mold cavity 1, the movable mold is provided with a cooling material well 5 at a position right opposite to the main runner, a ejector rod hole 2 is arranged in the movable mold, an ejector rod 3 for ejecting cooling material in the cooling material well 5 is arranged in the ejector rod hole 3 in a sliding manner, a flow baffle plate 4 is arranged in the ejector rod hole 2 along a radial direction, the flow baffle plate 4 divides the ejector rod hole 2 into a left half cavity 21 and a right half cavity 22, one end of the flow baffle plate 4 extends to the inner wall of the ejector rod hole 2 to divide the left half cavity 21 and the right half cavity 22, a gap is left between the other end of the flow baffle plate and the inner wall of the ejector rod hole 2, the gap forms an overflow channel 23, a sliding groove 31, the sliding groove 31 is in sliding fit with the flow baffle plate 4, the left half cavity 21 and the end face of the ejector rod 3 are enclosed to form a cold material well 5, the right half cavity 22 and the end face of the ejector rod 3 form a rear molten material cavity 6, and a pioneer molten material fills the left half cavity 21 and then enters the right half cavity 22 through an overflow channel.
Cut apart ejector pin hole 2 through keeping off the flow board 4, reduce the volume of half cavity 21 in the left side for the cold charge of pioneer can touch the end as early as possible, accomplish the contact with 3 terminal surfaces of ejector pin, fill up and fill up half cavity 21 in the left side after, the rethread overflow way gets into half cavity 22 in the right side, after setting up like this, between ejector pin 3 and the cold charge well 5, be difficult for producing the space, the contact is accomplished with 3 terminal surfaces of ejector pin to the essence of pioneer cold charge, when the stationery box finished product was ejecting, just can not have asymmetric space because of both sides, and the ejecting problem of slope appears.
The end face of the ejector rod 3 corresponding to the left half cavity 21 is a first end face 32, the end face corresponding to the right half cavity 22 is a second end face 33, a stepped structure is arranged on the first end face 32, a step on one side of the stepped structure close to the die cavity 1 is a starting step 34, a step on one side of the stepped structure close to the right half cavity 22 is an end step 35, and the height of the starting step 34 is relatively higher than that of the end step 35.
Because the pioneer cold charge is already in the semi-curing or fixed telephone state, its velocity of flow can be less than follow-up melt, follow-up melt crosses the pioneer cold charge very easily in the cold charge well, this crosses the process, just produce space or gas pocket easily, adopt and set up the stair structure on the ejector pin 3, when the pioneer cold charge gets into cold charge well 5, through the highest step of stair structure, take over the pioneer cold charge first, accomplish the support, even follow-up melt crosses the pioneer cold charge, also can get into next step, accomplish the contact with ejector pin 3 step by step, the cold charge well 5 that forms so laminates with ejector pin 3 completely, can not produce the space, when having avoided ejecting, the asynchronous problem of both sides stroke.
A flow blocking projection 36 is arranged on the first end surface 32 near the overflow, and the flow blocking projection 36 is positioned on the end step 35.
The baffle projection 36 is provided to prevent the flow of subsequent melt into the right half 22 too quickly.
The cross section of the flow baffle 4 is trapezoidal, and the end surface of the flow baffle close to the empty port side of the ejector rod hole 2 is a trapezoidal upper bottom.
The section of the flow baffle is trapezoidal, so that the draft angle is formed, and the demolding is facilitated.
And the end surface of the flow baffle close to one side of the hollow opening of the ejector rod hole 2 is provided with an arc transition.
The cross section of the flow blocking lug 36 is semicircular.
The steps of the stepped structure of the first end surface 32 are all in arc transition.
Claims (7)
1. The utility model provides a pen box injection mold's cold burden well structure, injection mold includes cover half and movable mould, the movable mould forms the die cavity with the movable mould cooperation, set up the sprue in the cover half, the sprue with the die cavity intercommunication sets up, the movable mould is just right the position of sprue is provided with the cold burden well, be provided with the ejector pin hole in the movable mould, it is used for ejecting to slide in the ejector pin hole the ejector pin of cold burden in the cold burden well, its characterized in that: the ejector rod hole is internally provided with a flow baffle along the radial direction, the flow baffle divides the ejector rod hole into a left half cavity and a right half cavity, one end of the flow baffle extends to the inner wall of the ejector rod hole to divide the left half cavity and the right half cavity, a gap is reserved between the other end of the flow baffle and the inner wall of the ejector rod hole, the gap forms an overflow channel, the ejector rod is provided with a sliding groove matched with the flow baffle in shape, the sliding groove is in sliding fit with the flow baffle, the left half cavity and the end face of the ejector rod are surrounded to form a cold material well, the right half cavity and the end face of the ejector rod form a rear melt cavity, and a pioneer melt fills the left half cavity and then enters the.
2. The cold charge well structure of pen box injection mold according to claim 1, characterized in that: the end face of the ejector rod corresponding to the left half cavity is a first end face, the end face corresponding to the right half cavity is a second end face, a step structure is arranged on the first end face, the step of the step structure close to one side of the die cavity is a starting point step, the step of the step structure close to one side of the right half cavity is an end point step, and the height of the starting point step is relatively higher than that of the end point step.
3. The cold charge well structure of pen box injection mold according to claim 2, characterized in that: and a flow blocking lug is arranged on the first end surface and close to the overflow channel, and the flow blocking lug is positioned on the terminal step.
4. The cold charge well structure of pen box injection mold according to claim 3, characterized in that: the cross section of the flow baffle is trapezoidal, and the end face of the flow baffle, which is close to the hollow side of the ejector rod hole, is a trapezoidal upper bottom.
5. The cold charge well structure of pen box injection mold according to claim 3, characterized in that: and the end surface of the flow baffle close to one side of the hollow opening of the ejector rod hole is provided with an arc transition.
6. The cold charge well structure of pen box injection mold according to claim 3, characterized in that: the cross section of the flow blocking lug is semicircular.
7. The cold charge well structure of pen box injection mold according to claim 3, characterized in that: and all steps of the first end face stepped structure are in circular arc transition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921465346.3U CN211763076U (en) | 2019-09-04 | 2019-09-04 | Pen box injection mold's cold burden well structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921465346.3U CN211763076U (en) | 2019-09-04 | 2019-09-04 | Pen box injection mold's cold burden well structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211763076U true CN211763076U (en) | 2020-10-27 |
Family
ID=72906902
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921465346.3U Active CN211763076U (en) | 2019-09-04 | 2019-09-04 | Pen box injection mold's cold burden well structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211763076U (en) |
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2019
- 2019-09-04 CN CN201921465346.3U patent/CN211763076U/en active Active
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