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CN-121798859-B - Special die for precision part and injection molding method

CN121798859BCN 121798859 BCN121798859 BCN 121798859BCN-121798859-B

Abstract

The invention relates to the technical field of injection molding and discloses a special die for a precision part and an injection molding method, wherein the special die comprises a die body, a guide seat, two hold-down pieces, a die holder, a plurality of air pipes and an air blowing unit, wherein the die body comprises an upper die and a lower die, the gate seat is arranged on the die body, the guide seat is connected with the gate seat, the two hold-down pieces are symmetrically arranged in the die, the die holder is positioned in the die and communicated with the guide seat, the air pipes are arranged in the die, and the air blowing unit is communicated with the air pipes; the air blowing unit is positioned in the die holder and used for cooling and demolding an injection molding piece in the die holder, and the air quantity in the control assembly is regulated through the cooperation between the exhaust valve and the air inlet valve, so that the guide rod can reciprocate in the control assembly, the air in the control assembly is compressed, the air can be sprayed out from the air spraying seat, and the demolding work between the injection molding piece and the axial direction of the die is completed.

Inventors

  • JIANG XINGHUA
  • XIAO FA

Assignees

  • 苏州达胜捷智能制造科技有限公司

Dates

Publication Date
20260508
Application Date
20260312

Claims (7)

  1. 1. A mold dedicated for precision parts, comprising: The die (1) body comprises an upper die, a lower die, a pouring gate seat (2) arranged on the die (1) body, a flow guide seat (3) connected with the pouring gate seat (2), two hold-down pieces (4) symmetrically arranged in the die (1), a die holder (5) positioned in the die (1) and communicated with the flow guide seat (3), a plurality of air pipes (7) arranged in the die (1) and an air blowing unit (6) communicated with the air pipes (7); the blowing unit (6) is positioned in the die holder (5) and is used for cooling and demolding injection molding pieces in the die holder (5); The blowing unit (6) comprises two mounting seats (65) arranged at the bottom of the die holder (5), an exhaust pipe (62) used for connecting the two mounting seats (65), a demoulding assembly (61) and a control assembly (64) arranged on one mounting seat (65), and an adjusting assembly (63) arranged on the other mounting seat (65); The control assembly (64) is used for adjusting the position of the demolding assembly (61) so as to change the impact force of air flow during demolding, and demolding work can be completed for different injection molding parts; a plurality of air outlet holes are formed in the circumferential direction of the exhaust pipe (62); the adjusting component (63) is communicated with the plurality of air pipes (7), and the flowing direction of the air flow is changed through the movement of the adjusting component (63), so that the air flow can be contacted with the bottom and the inner wall of the injection molding piece, and impact force is generated, and the demolding work of the injection molding piece is completed; The control assembly (64) comprises a driving handle (641) which is arranged on the mounting seat (65) and is in sliding connection with the mounting seat (65), a plurality of gear teeth are arranged on the driving handle (641), an adjusting gear (642) meshed with the gear teeth, and a guide tube (643) connected with the adjusting gear (642); the guide pipe (643) is sleeved on the demoulding assembly (61), and the position between the guide pipe (643) and the demoulding assembly (61) is adjusted through rotation of the guide pipe, so that the impact force of air flow is changed, and the demoulding operation of injection molding pieces is completed; The adjusting assembly (63) comprises a propelling pipe (631) arranged in the mounting seat (65), a propelling spring (632) used for connecting the propelling pipe (631) and the mounting seat (65), a plurality of air holes (639) formed in the circumferential direction of the propelling pipe (631), and a plurality of sealing rings arranged between the propelling pipe (631) and the mounting seat (65); an adjusting cylinder is arranged in the die (1), and the output end of the adjusting cylinder is connected with a pushing pipe (631); The propulsion tube (631) is of a U-shaped structure, and the propulsion tube (631) can move forward by adjusting the movement of the air cylinder, so that the flow direction of air flow is changed.
  2. 2. The special die for precision parts according to claim 1, wherein the demolding assembly (61) comprises a ventilation seat (611) abutted against the mounting seat (65), a guide rod (613) connected with the ventilation seat (611), a return spring (612) for connecting the ventilation seat (611) with a guide tube (643), a first groove (614) respectively arranged at one end of the guide rod (613) along the axial direction of the guide rod (613), and a second groove (615) communicated with the first groove (614) and arranged in the circumferential direction of the guide rod (613); the guide pipe (643) is sleeved on the guide rod (613), and the impact force of air flow is changed by rotating the guide pipe (643) so as to change the overlapping area between the second groove (615) and the guide pipe (643); at least two vent holes are arranged on the vent seat (611).
  3. 3. The special die for the precise component according to claim 2, wherein the mounting seat (65) is internally provided with an air inlet (616), a drainage channel (617) formed on the guide pipe (643), an air injection seat (621) in threaded connection with the mounting seat (65), a sealing rod (618) arranged in the air injection seat (621), an air injection pipe (620) connected with the air injection seat (621), and a sealing spring (619) for connecting the air injection pipe (620) and the sealing rod (618); one end of the sealing rod (618) is mushroom-shaped and is provided with a sealing gasket in advance; The air injection pipe (620) is provided with an air injection channel which is used for communicating an air injection port on the air injection seat (621) and a region between the air injection pipe (620) and the air injection seat (621); A gap is preset between one end of the drainage channel (617) and the air inlet (616), and the other end of the drainage channel (617) is communicated with the inside of the guide tube (643).
  4. 4. A special die for precision parts according to claim 3, wherein a first space is formed between one end of the guide rod (613) close to the sealing rod (618) and the inner walls of the sealing rod (618) and the guide tube (643), the first space is used for storing gas, and the gas in the first space is compressed through the movement of the sealing rod (618) so that the gas can impact the sealing rod (618), the deformation amount of the sealing spring (619) is changed, and the gas is sprayed out from the air spraying seat (621) to finish the demoulding operation of injection molding parts.
  5. 5. The mold for precision parts according to claim 4, wherein the adjusting unit (63) further comprises an inner tube (635) provided in the mounting base (65), a support spring (634) connected to the inner tube (635), a plug (633) connected to the support spring (634) and abutting the mounting base (65), and a seal ring provided between the plug (633) and the mounting base (65); By controlling the movement of the plug (633) so that gas can enter the control assembly (64), the control assembly (64) can perform intermittent inflation.
  6. 6. The special die for the precise component of claim 5, wherein the mounting seat (65) is internally provided with a first annular chamber (636), a second annular chamber (638) arranged between the mounting seat (65) and the inner tube (635), and a plurality of air spraying passages (637) which are arranged on the mounting seat (65) and are used for communicating the first annular chamber (636) with the second annular chamber (638); By moving the push tube 631 and pushing the plug 633, the air hole 639 on the push tube 631 communicates with the first chamber 636, so that the air flow can enter the second chamber 638, and the spraying operation of the axial air flow is realized.
  7. 7. An injection molding method applied to the special die for the precise part according to claim 6, comprising the following steps: s1, when injection molding work is required to be carried out on an injection molding part, the upper die and the lower die are in a die clamping state, injection molding raw materials are injected into a guide seat (3) through a gate seat (2), and then enter a die holder (5) along a guide pipeline on the guide seat (3), so that the injection molding work is completed; S2, after injection molding, an air supply front adjusting cylinder drives a pushing pipe (631) to move, and the position of an air pipe (7) in the axial direction of a mounting seat (65) is adjusted to enable an air hole (639) to be aligned with the area of an exhaust pipe (62); S3, after preliminary demoulding, the adjusting cylinder acts again to push the pushing tube (631) to drive the plug (633) to move in the mounting seat (65) so as to enable the first chamber (636) to be communicated with the air hole (639), and air enters the first chamber (636) through the pushing tube (631) and the air hole (639) and flows into the second chamber (638) to provide power for the control assembly (64) to drive the control assembly to move; S4, during secondary demolding, the other air enters the mounting seat (65) through the air inlet (616) and flows into a first space formed by the first groove (614) and the second groove (615) along the drainage channel (617), the adjusting component (63) injects axial air to push the plug (633) to move in the guide pipe (643) so as to extrude the air in the first space to push the sealing rod (618) open, and thus the axial secondary demolding of the injection molding piece is realized; S5, when the impact force of the air flow is regulated, the driving handle (641) drives the regulating gear (642) to rotate so as to drive the guide tube (643) to rotate, and the connection position of the second groove (615) and the drainage channel (617) is regulated; when the guide rod (613) moves beyond a preset area, the first groove (614) and the second groove (615) enable the first space to be communicated with the drainage channel (617), the pressure of the first space is instantaneously reduced, and the sealing rod (618) is reset; And S6, finally, gas sprayed from the sealing rod (618) can be sprayed from the gas spraying seat (621) along the gas spraying pipe (620) and is contacted with the bottom of the injection molding piece, so that the injection molding piece can be separated from the mold (1), and the injection molding piece is subjected to secondary demolding work, so that the injection molding production work of the injection molding piece is completed.

Description

Special die for precision part and injection molding method Technical Field The invention relates to the technical field of injection molding, in particular to a special die for a precision part and an injection molding method. Background The injection mold is a core tool for mass production of plastic products, and a product with a required shape is finally obtained by injecting molten plastic into a cavity of the injection mold and cooling and shaping the molten plastic. The core of the device consists of a movable die and a fixed die, wherein the movable die and the fixed die are closed to form a cavity during working, and ejection of a product is completed during die opening. The mold has precise structure, contains key components such as a pouring system, a guiding mechanism, an ejection mechanism and the like, needs to be specifically designed according to the plastic characteristics and the product shape, and is widely applied to the fields of automobiles, household appliances, medical treatment and the like. The Chinese patent with the publication number of CN102990865B discloses a pipe injection mold, which comprises a front mold, a rear mold, a core group and a tensioning device, wherein the front mold and the rear mold are matched to form an injection molding cavity, the injection molding cavity consists of a water gap runner communicated with a mold pouring system and a plurality of product molding cavities communicated with the water gap runner, the tensioning device is provided with a hydraulic cylinder installed below the front mold through a bracket and a pull block installed at the end part of a piston rod, the core group consists of a plurality of cores, each core is installed in one product molding cavity, the upper end of each core is matched and fixed with the upper end of the product molding cavity, the lower end of each core is connected with the pull block, each product molding cavity is matched with one core to form a pipe cavity, and the piston rod is fixedly connected with the pull block through a nut. However, the prior art scheme still has some problems, the existing device is after carrying out injection moulding, because the injection molding that forms is located the mould, therefore in the in-process of drawing of patterns, generally through cylinder or blowing equipment, provide certain thrust to the injection molding to make the injection molding can keep away from the die holder, accomplish the drawing of patterns work of injection molding, and in this process, current drawing of patterns equipment is mostly through exerting axial force to the injection molding, accomplish the drawing of patterns, but the inner wall of injection molding also can contact with between the die holder, when carrying out axial promotion, if adhesion between injection molding inner wall and the die holder, can lead to the damage of injection molding. Therefore, how to perform the demolding operation on the injection molding is a problem to be solved at present. Disclosure of Invention The invention provides a special die for a precision part and an injection molding method, which are used for solving the problems in the prior art. A precision part-specific mold comprising: The die comprises a die body, a die seat, a blowing unit and a pressing part, wherein the die body comprises an upper die, a lower die, a pouring gate seat, a flow guide seat, two pressing parts and a die seat, the pouring gate seat is arranged on the die body, the flow guide seat is connected with the pouring gate seat, the two pressing parts are symmetrically arranged in the die, the die seat is positioned in the die and communicated with the flow guide seat, a plurality of air pipes are arranged in the die, and the blowing unit is communicated with the air pipes; The air blowing unit is positioned in the die holder and used for cooling and demolding an injection molding piece in the die holder, and the air blowing unit also comprises an air pump which is externally connected with the air pipe, wherein the air pump is used for conveying air into the air blowing unit, the air blowing unit can adjust the flowing direction of air flow, so that the air flow can flow axially and circumferentially from the air blowing unit, the air flow moving axially can impact the bottom of the injection molding piece, the injection molding piece can be separated from the die holder, the air flow moving circumferentially can cool and dissipate heat of the injection molding piece, and meanwhile, the inner wall of the injection molding piece can be separated from the die holder, so that the secondary demolding of the injection molding piece is completed; Further, the blowing unit comprises two mounting seats arranged at the bottom of the die holder, an exhaust pipe used for connecting the two mounting seats, a demoulding assembly and a control assembly arranged on one mounting seat, and an adjusting assembly arranged on the other mounting seat, w