CN219768999U - Exhaust forming pin piece and exhaust mechanism - Google Patents

Abstract

The utility model relates to the technical field of air trapping and air exhausting of a die, in particular to an air exhausting forming pin piece and an air exhausting mechanism. The utility model aims to overcome the defects that the layout position of the existing exhaust insert is greatly limited and the defect of trapped air near a forming pin cannot be well overcome.

Description

Exhaust forming pin piece and exhaust mechanism

Technical Field

The utility model relates to the technical field of air trapping and exhausting of molds, in particular to an exhaust molding pin piece and an exhaust mechanism.

Background

In the injection molding or die-casting molding process, when the liquid flowing in the naturally-exhausted mold passes through the irregular molded surface, two or three or even multiple fluid converging conditions inevitably exist, so that trapped air is formed, and the trapped air is required to be removed at the moment to avoid forming product defects, for example, a deep hole or a deep cavity forming part. The quality problem exists in industry, and the solutions mainly have 2 directions: one direction is to adjust through temperature and runner aperture or valve needle opening time, realizes different filling sequences, avoids the formation of two or three or even multi-strand confluence, but the method does not need the phenomenon of three or even multi-strand fluid confluence, has small adjustable amplitude, or can cause other quality problems after adjustment, and has a narrower overall process adjustment window. The other direction is corresponding to the mold structure, so that trapped air is discharged, and the formation of trapped air is avoided: for example, the ventilation steel is a high-quality special metal material, the ventilation steel is refined by a powder sintering technology, the structure is similar to that of a plurality of steel balls which are mutually fused and bonded together, innumerable pores (about 10 mu m) are arranged in the ventilation steel to be connected into net-shaped pores, when the product is trapped in air, the air can be discharged through the net-shaped pores of the ventilation steel under the condition of being pressed, but the net-shaped channels of the ventilation steel are easy to be blocked, difficult to dredge after being blocked, only capable of being replaced, and high in cost; the die is designed into an insert mode under the condition that the appearance and the structure of a product are not affected, gaps are reserved on the insert faces, gas in a cavity can be smoothly discharged, but the insert structure is used for discharging, and the die is complicated to process and high in cost by only using the tetragonal exhaust insert.

The existing mold exhaust mode is mostly limited by adding the insert or the insert in the mold, but because the processed finished product has a plurality of complex structures, such as water holes, pushing blocks and other structures, the processed finished product is required to be embedded with a bump structure such as a forming pin in a mold forming cavity, and the exhaust insert and other structures are required to be avoided, so that the layout of the exhaust insert is very limited, and the problem of trapped air is often more easily existed in the place where the bump structure such as the forming pin exists, and the problems cannot be well comprehensively solved.

Disclosure of Invention

The utility model aims to overcome the defect that the existing exhaust insert is limited in layout position greatly and can not well solve the defect of trapped air near a forming pin, and provides an exhaust forming pin piece and an exhaust mechanism. The utility model integrates the exhaust function into the forming pin, reasonably designs the exhaust channel and the structure, enables the forming pin of the die to exhaust from the body, and can realize the function of the forming pin as an ejection piece or a forming piece and simultaneously realize the exhaust and the exhaust pressure.

In order to solve the technical problems, the utility model adopts the following technical scheme:

the utility model provides a but exhaust shaping cotter spare, includes the round pin post main part, and the exhaust passage that coincides and run through both ends terminal surface with the axis of round pin post main part is seted up to the inside of round pin post main part, and the last little seam of exhaust that still has seted up intercommunication exhaust passage and run through the outer lateral wall of round pin post main part.

In the die casting field, the exhaust molding pin piece can comprise molding pieces such as a casting pin, the injection molding field can comprise molding pieces such as a molding pin, the exhaust molding pin piece can also comprise structures such as an ejection pushing block in a mold, the molding pin piece structures do not have an exhaust function, gas cannot be effectively discharged, the adjacent molding pin pieces are blocked by the protruding structures of the molding pin pieces, molten material fluid can be always converged at least once in the circumferential direction of the molding pin, if a plurality of strands of materials are converged, the problem that a plurality of air holes exist in a die casting or injection molding product, the quality problem and the mechanical performance of the product are reduced, and hidden danger exists.

Further, the internal channel of the exhaust micro-slit is rectangular in diameter, and the width of the port of the exhaust micro-slit is 0.01-0.05 mm. It should be noted that, the edge overflow value of the common injection molding or die casting material is between 0.01mm and 0.05mm, so that the width of the micro-slit port can be reasonably adjusted by being used for the exhaust molding pin piece in injection molding or die casting of different materials, so that the width of the micro-slit port is smaller than the edge overflow value of the material, thereby ensuring good exhaust performance and not affecting the appearance quality of the product.

Further, the exhaust micro-slit comprises a plurality of first micro-slits with openings positioned on the outer side wall of the middle part of the pin body and a plurality of second micro-slits with openings positioned on the end part of the pin body. The micro-gaps are formed in the outer side walls of the end parts and the middle parts, and are arranged based on trapping points which are used for generating more trapping gas when materials are converged near the forming pins in the injection molding or die casting process, so that the exhaust micro-gaps in different positions can exhaust the trapping gas from the outside of the die cavity through the exhaust channels as much as possible.

Further, the ventilation paths of the first micro-slits and the second micro-slits form a certain included angle with the axis of the pin body.

Further, the included angle formed by the ventilation paths of the first micro-slits and the second micro-slits and the axis of the pin body ranges from 30 degrees to 60 degrees.

It should be noted that, the ventilation paths of the first micro-slit and the second micro-slit form a certain included angle with the axis of the pin body, and there are three design considerations: firstly, the punching process of the first micro-seam and the second micro-seam cannot directly reach the size range of the target micro-seam when the first micro-seam and the second micro-seam are formed, so that round holes are required to be stretched and extruded into rectangular drift diameters in a forging mode and the like, the port length of the micro-seam is lengthened and the width of the micro-seam can be controlled within a very small range under the condition of the same caliber perimeter, but the ventilation capacity is not affected, and the port width of the micro-seam is smaller than the overflow value of a material, so that good exhaust performance is ensured and the appearance quality of a product is not affected; secondly, the micro-gaps are arranged in an inclined mode, and are arranged based on the flowing direction of the molten material in the injection molding or die casting process, and are arranged at a certain angle to be capable of conforming to the flowing direction of the molten material, so that as much exhaust can be performed as possible; third, compare in the micro-slit shape perpendicular to middle exhaust passage, set up the micro-slit of slope on the round pin post main part, the bulk strength of assurance round pin post main part that can be better.

Further, the plurality of first micro-slits are uniformly distributed circumferentially around the outer side wall of the pin body and are distributed in longitudinal rows along the length direction of the axis, and the plurality of second micro-slits are uniformly distributed circumferentially around the end portion of the pin body with the axis.

The circumferential distribution of the first micro-slit and the second micro-slit is to satisfy the air trapping and exhausting of the forming pin member at the same height but in different directions, and is generally linearly distributed along the longitudinal direction of the pin body when the material is converged at the circumferential side of the forming pin member, so the longitudinal distribution of the first micro-slit can satisfy the timely elimination of more air trapping near the converging line.

Further, the pin body comprises a forming cylindrical end which is used for extending into the forming cavity of the die to form a hole, and a prismatic end which is used for being inserted into and installed and fixed in the die. Generally, the fixed section is in a prismatic shape, so that the forming pin can be prevented from axial rotation, and the prismatic end used for being inserted and installed and fixed in the die can ensure the stability of the forming process.

Further, the end face caliber of the exhaust channel positioned at the forming cylinder end is 0.01-0.05 mm, and the internal minimum drift diameter of the exhaust channel is larger than the end face caliber of the exhaust channel positioned at the forming cylinder end. The exhaust passage penetrates through the two ends of the pin body, wherein the caliber of one end port for extending into the molding cavity of the mold to perform hole molding also meets the condition of being smaller than the edge overflow value of injection molding or die casting materials, so that the caliber of the end surface of the exhaust passage at the molding cylindrical end is smaller than the edge overflow value of the materials, thereby ensuring good exhaust performance and not affecting the appearance quality of products. Secondly, the internal drift diameter of the exhaust channel is wide, so that the trapped air collected by different exhaust micro-gaps and exhaust channel ports can be discharged at the same time, and the discharge flux and the smoothness of the gas are ensured.

The utility model also provides a forming pin piece exhaust mechanism which comprises the exhaust forming pin piece and a vacuum generator communicated with an exhaust channel.

Further, a sealing element is arranged between the vacuum generator and the connecting end face of the pin body.

After the forming pin member itself has the exhausting function, the vacuum generator may be installed according to practical situations to form the forming pin member exhausting mechanism with the active exhausting function, so that the partial active vacuum can be realized to exhaust, the exhausting efficiency is higher, and the exhausting effect is obvious.

Compared with the prior art, the utility model has the beneficial effects that:

according to the utility model, on the basis of an original molding pin piece, the exhaust function is added, the exhaust channels penetrating through the two ends of the pin body and the exhaust micro-slits penetrating through the exhaust channels and the outer side wall of the pin body are respectively arranged, and in the molding process, trapped air formed at the joint of the molded surface or multiple strands of materials can be discharged to the outside of the mold cavity through the exhaust micro-slits and the exhaust channels, so that the trapped air of a product is avoided, and the bad quality of multiple air holes near the molding holes is eliminated to the greatest extent.

Drawings

FIG. 1 is a schematic view of the overall structure of a ventable forming pin of the present utility model;

FIG. 2 is a schematic view of the internal structure of the ventable forming pin of the present utility model;

FIG. 3 is a schematic view of the structure of the pin venting mechanism of the present utility model.

The graphic indicia are illustrated as follows:

1-pin body, 11-vent channel, 12-vent micro-slit, 121-first micro-slit, 122-second micro-slit, 13-shaped cylindrical end, 14-prismatic end, 5-vacuum generator, 6-seal.

Detailed Description

The utility model is further described below in connection with the following detailed description. Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to be limiting of the present patent; for the purpose of better illustrating embodiments of the utility model, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numbers in the drawings of embodiments of the utility model correspond to the same or similar components; in the description of the present utility model, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc., based on the azimuth or positional relationship shown in the drawings, it is only for convenience of describing the present utility model and simplifying the description, but it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus terms describing the positional relationship in the drawings are merely illustrative and should not be construed as limitations of the present patent, and specific meanings of the terms described above may be understood by those skilled in the art according to specific circumstances.

Example 1

As shown in fig. 1, an exhaust molding pin member comprises a pin body 1, wherein an exhaust channel 11 which coincides with the axis of the pin body 1 and penetrates through end surfaces at two ends is formed in the pin body 1, and an exhaust micro-slit 12 which is communicated with the exhaust channel 11 and penetrates through the outer side wall of the pin body 1 is formed in the pin body 1.

In this embodiment, the exhaust molding pin is a molding casting pin in the field of die casting, the internal channel of the exhaust micro-slit 12 is rectangular, the port width of the exhaust micro-slit 12 is 0.02mm, and the exhaust micro-slit can be applied to die casting materials with edge overflow values larger than 0.02mm, such as ABS, PMMA, hard PVC, (PA/PA 6/PA 66) +gf, POM/pom+gf and AL (aluminum alloy), so as to ensure good exhaust performance without affecting the appearance quality of the product.

As shown in fig. 2, the exhaust micro-slots 12 include a plurality of first micro-slots 121 open at the outer side wall of the middle portion of the pin body 1, and a plurality of second micro-slots 122 open at the end portion of the pin body 1. The micro-slits are formed in the outer side walls of the end parts and the middle part, and are arranged based on the fact that the trapped air points which are more in trapped air are formed when materials are converged near the forming pins in the injection molding or die casting process, so that the exhaust micro-slits 12 in different positions can exhaust the trapped air from the outside of the die cavity through the exhaust channels 11 as much as possible.

As shown in fig. 2, the ventilation paths of the first and second micro-slits 121 and 122 each form an angle of 45 ° with the axis of the pin body 1.

As shown in fig. 1 and 2, the pin body 1 includes a molding cylindrical end 13 for extending into a molding cavity of a mold for hole molding, and a prismatic end 14 for insertion and installation and fixation in the mold. The fixed section is in a prismatic shape, so that the forming pin piece can be prevented from axial rotation, and the prismatic end 14 used for being inserted and installed and fixed in the die can ensure the stability of the forming process.

In this embodiment, the end face caliber of the exhaust passage 11 at the forming cylindrical end 13 is 0.02mm, and the internal minimum drift diameter of the exhaust passage 11 is larger than the end face caliber of the exhaust passage 11 at the forming cylindrical end 13. The vent passage 11 penetrates through the two ends of the pin body 1, wherein the caliber of one end opening for extending into the molding cavity of the mold to perform hole molding also meets the condition of being smaller than the edge overflow value of injection molding or die casting materials, so that the caliber of the end surface of the vent passage 11 positioned at the molding cylindrical end 13 is smaller than the edge overflow value of the materials, thereby ensuring good vent performance and not affecting the appearance quality of products. Secondly, the internal drift diameter of the exhaust channel 11 is set to be wider, so that the trapped air collected by different exhaust micro-gaps 12 and ports of the exhaust channel 11 can be discharged at the same time, and the discharge flux and the smoothness of the gas are ensured.

The principle and advantages of this embodiment are: in the die casting field, since the forming pin such as the casting pin is not provided with the exhausting function, gas cannot be effectively exhausted, and the forming pin is blocked by the structure of the forming pin, the molten material fluid is bound to be converged at least once in the circumferential direction of the forming pin, if a plurality of materials are in a multi-strand converging phenomenon, the die casting product has a plurality of bad problems of multiple air holes, the quality problem and the mechanical performance of the product are reduced, and hidden danger exists.

Example 2

This embodiment is similar to embodiment 1 except that:

as shown in fig. 1, the plurality of first micro-slits 121 are uniformly distributed circumferentially around the outer side wall of the pin body 1 and are distributed in a column along the length direction of the axis, and the plurality of second micro-slits 122 are uniformly distributed circumferentially around the end of the pin body 1 with the axis.

In this embodiment, the first micro-slits 121 are symmetrically distributed around the outer sidewall of the pin body 1, and are distributed in nine rows along the length direction of the axis in longitudinal rows, so that two rows of nine rows of micro-slits are distributed on the outer sidewall of the pin body 1, which can well meet the exhaust requirement of the material stranding and combining line.

The circumferential distribution of the first micro-slit 121 and the second micro-slit is to satisfy the air trapping and exhausting of the forming pin at the same height but in different directions, and is generally linearly distributed along the pin body 1 in the longitudinal direction when the material joins at the circumferential side of the forming pin, so the longitudinal distribution of the first micro-slit 121 can satisfy the timely elimination of the air trapping in the vicinity of the joining line.

The principle and advantages of this embodiment are: in the die casting field, since the forming pin such as the casting pin is not provided with the exhausting function, gas cannot be effectively exhausted, and the forming pin is blocked by the structure of the forming pin, molten material fluid is bound to be converged at least once in the circumferential direction of the forming pin, if a plurality of strands of materials are in a converging state, the poor problem of multiple air holes exists in the die casting or injection molding product, the quality problem and the mechanical performance of the product are reduced, and hidden danger exists.

Example 3

As shown in fig. 3, the utility model further provides a forming pin member exhaust mechanism, which comprises the forming pin member capable of exhausting and further comprises a vacuum generator 5 communicated with the exhaust channel 11, wherein in the embodiment, the vacuum generator is communicated with the port of the exhaust channel 11 positioned at the port of the prism end 14, the vacuum generator 5 forms vacuum on the exhaust channel 11 and the communicated exhaust micro-gaps 12 thereof, and can actively suck the trapped air in the die cavity to form negative pressure and actively exhaust.

As shown in fig. 3, a sealing member 6 is further provided between the vacuum generator 5 and the connecting end face of the pin body 1.

In this embodiment, the sealing member 6 may be a sealing gasket or a sealing ring.

The principle and advantages of this embodiment are: after the forming pin piece has the exhausting function, the forming pin piece is arranged in a vacuum generator to form an exhausting mechanism of the forming pin piece with the active exhausting function, so that partial active vacuum can be realized for exhausting, the exhausting efficiency is higher, and the exhausting effect is obvious.

It is to be understood that the above examples of the present utility model are provided by way of illustration only and not by way of limitation of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. The utility model provides a but exhaust shaping round pin spare, its characterized in that, includes round pin post main part (1), the inside of round pin post main part (1) seted up with the axis coincidence of round pin post main part (1) just runs through exhaust passage (11) of both ends terminal surface, still set up on round pin post main part (1) intercommunication exhaust passage (11) just runs through exhaust micro-slit (12) of round pin post main part (1) lateral wall.

2. The shaped pin member of claim 1, wherein the internal passage of the vent micro-slot (12) is rectangular in shape and has a width of 0.01mm to 0.05mm.

3. A shaped pin according to claim 1, characterized in that the venting micro-slots (12) comprise first micro-slots (121) with openings in the middle outer side wall of the pin body (1) and second micro-slots (122) with openings in the end of the pin body (1).

4. A shaped pin according to claim 3, characterized in that the ventilation paths of the first (121) and second (122) micro-slots are each at an angle to the axis of the pin body (1).

5. A shaped pin according to claim 4, characterized in that the ventilation paths of the first (121) and second (122) micro-slots form an angle with the axis of the pin body (1) in the range of 30 ° to 60 °.

6. The shaped pin according to claim 4, characterized in that a plurality of said first micro-slots (121) are circumferentially uniformly distributed around the outer side wall of said pin body (1) and longitudinally along the length of said axis, and a plurality of said second micro-slots (122) are circumferentially uniformly distributed with said axis around the end of said pin body (1).

7. A ventable forming pin according to claim 1, characterized in that the pin body (1) comprises a forming cylindrical end (13) for extending into a mould forming cavity for hole forming and a prismatic end (14) for insertion and mounting in a mould.

8. The shaped pin piece capable of exhausting according to claim 7, wherein the end face caliber of the exhaust passage (11) located at the shaped cylindrical end (13) is 0.01-0.05 mm, and the minimum internal drift diameter of the exhaust passage (11) is larger than the end face caliber of the exhaust passage (11) located at the shaped cylindrical end (13).

9. A forming pin venting mechanism comprising a venting forming pin according to any one of claims 1 to 8, and further comprising a vacuum generator (5) in communication with the venting channel (11).

10. A shaped pin venting mechanism according to claim 9, characterized in that a seal (6) is also provided between the vacuum generator (5) and the connecting end face of the pin body (1).