Sunroof mechanical assembly front lifting arm injection mold and injection molding process thereof
By introducing positioning pins and resistance-increasing inserts into the injection mold, the problem of displacement of the insert body during injection molding is solved, achieving high precision and high yield of the finished insert and simplifying the demolding process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-10-26
- Publication Date
- 2026-03-20
AI Technical Summary
During the injection molding process, the insert body is prone to displacement, which affects the yield and quality of the injection molded product.
A front lifting arm injection mold for a sunroof mechanical assembly was designed. By setting positioning pins and resistance-increasing inserts in the mold, the pre-positioning and damping fixation of the insert body can be achieved, reducing the possibility of displacement during the injection molding process.
It improves the dimensional accuracy and pass rate of the finished inserts, ensures that the inserts do not shift or float during injection molding, and facilitates demolding.
Smart Images
Figure CN115592889B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of injection mold, and in particular to a sunroof mechanical assembly front lifting arm injection mold and an injection molding process thereof. BACKGROUND
[0002] Injection molding, also known as injection molding, is a molding method of injection and molding. The advantages of injection molding method are fast production speed, high efficiency, automatic operation, various colors and shapes, and accurate product size. The product is easy to update, can form complex parts, and is suitable for mass production and complex product molding processing fields.
[0003] The injection mold is a tool required for injection molding. It injects molten material under high pressure into the mold cavity, and after cooling and solidification, the shaped product is obtained. With the increasing complexity of plastic products, inserts are often used in the injection molding process, for example, the front lifting arm of the sunroof mechanical assembly, as shown in Figure 11 The front lifting arm includes an insert body 5 and a plastic outer package 50, and the insert body 5 is a metal product. When the insert body 5 is injection molded, the insert body 5 needs to be placed in the molding cavity of the mold first, and then the injection molding operation is performed after the mold is closed. Finally, the insert product (front lifting arm) is obtained by demolding.
[0004] According to the related technology in the above, the inventors believe that there are the following defects: However, the insert body often displaces during injection molding, which affects the injection molding yield and the quality of the injection molded product, and therefore needs to be further improved. SUMMARY
[0005] In order to reduce the possibility of displacement of the insert body, one of the purposes of the present application is to provide a sunroof mechanical assembly front lifting arm injection mold.
[0006] The sunroof mechanical assembly front lifting arm injection mold provided by the present application adopts the following technical solution:
[0007] The sunroof mechanical assembly front lifting arm injection mold comprises a fixed mold, a movable mold located above the fixed mold, a lower mold core installed on the fixed mold, and an upper mold core installed on the movable mold, wherein the upper mold core is located above the lower mold core, the upper end surface of the lower mold core is provided with an insert placement groove for placing an insert body, the upper end surface of the lower mold core is provided with a lower forming cavity connected to the insert placement groove, the lower end surface of the upper mold core is provided with an upper forming cavity corresponding in position to the lower forming cavity, the lower end surface of the insert body abuts against the inner bottom wall of the insert placement groove, the insert body partially extends into the lower forming cavity to form a cladding part, the lower end surface of the upper mold core abuts against the upper end surface of the insert body and the lower mold core, the upper forming cavity and the lower forming cavity form a closed injection cavity, the upper mold core / lower mold core is provided with an injection hole connected to the injection cavity, there is a flow liquid gap between the outer side wall of the insert body and the inner side wall of the injection cavity, and the bottom inner wall of the insert placement groove is provided with a positioning column protruding therefrom, and the insert body is provided with a first positioning hole for inserting the positioning column.
[0008] By adopting the above technical scheme, before injection molding, the insert body is placed in the insert placement groove of the lower mold core, and the positioning column is inserted into the first positioning hole, thereby positioning the insert body in the insert placement groove, reducing the possibility of displacement of the insert body during injection molding, and ensuring the dimensional accuracy and qualification rate of the insert product. In addition, after the upper mold core and the lower mold core are closed, the lower end surface of the upper mold core abuts against the upper end surface of the insert body, thereby achieving the purpose of constraining the vertical sliding freedom of the insert body by the upper mold core, thereby reducing the possibility of floating of the insert body during injection molding, further reducing the possibility of displacement of the insert body during injection molding, and ensuring the dimensional accuracy and qualification rate of the insert product.
[0009] Preferably, the cladding part is provided with a plurality of flow liquid holes.
[0010] By adopting the above technical scheme, the flow liquid holes are formed in the insert body. On the one hand, when injection molding is performed, injection liquid enters the injection cavity from the injection hole, part of the injection liquid enters the upper forming cavity / lower forming cavity from the flow liquid gap, and part of the injection liquid enters the upper forming cavity / lower forming cavity from the flow liquid hole, thereby improving the efficiency of filling the injection cavity with injection liquid. On the one hand, the possibility of floating of the insert body due to the impact force of the injection liquid during injection molding is reduced. On the other hand, the plastic outer covering part formed after molding forms a column core inserted into the flow liquid hole, thereby improving the connection stability of the plastic outer covering part and the insert body and reducing the possibility of separation of the plastic outer covering part and the insert body.
[0011] Preferably, the first positioning hole and the positioning column are clearance fit, the lower mold core is provided with a limiting platform protruding from the inner side wall of the insert placing groove for the outer side wall of the insert body to abut, the upper end face of the lower mold core is provided with a first installation groove, the first installation groove is communicated with the inner side wall of the insert placing groove away from the limiting platform, the lower mold core is provided with a first resistance increasing insert built in the first installation groove, the first resistance increasing insert is flexible, the lower part of the first resistance increasing insert is hinged to the inner wall of the first installation groove, the upper part of the first resistance increasing insert is provided with a first pushing part abutting against the side wall of the insert body, and the upper mold core is provided with a first linkage block forcing the first pushing part of the first resistance increasing insert to abut against the side wall of the insert body so that the insert body moves along the width direction and abuts against the limiting platform.
[0012] By adopting the above technical scheme, the first positioning hole and the positioning column are clearance fit, the worker can conveniently place the insert body in the insert placing groove, the insert body and the insert placing groove are pre-positioned, during the closing of the upper mold core and the lower mold core, the first linkage block forces the free end of the first resistance increasing insert to rotate towards the limiting platform, during the rotation of the free end of the first resistance increasing insert, the first pushing part abuts against the outer side wall of the insert body so that the insert body slides along the width direction of the insert body and abuts against the limiting platform, the position of the insert body in the insert placing groove is fixed in a damping manner, the freedom of the insert body to slide along the width direction of the insert body is restricted, and the possibility of displacement of the insert body during the injection molding is reduced.
[0013] Preferably, the first linkage block protrudes from the lower end face of the upper mold core, the upper end face of the lower mold core is provided with a first plug-in groove communicated with the inner wall of the first installation groove away from the insert placing groove, the first linkage block is provided with a first guide slope forcing the first pushing part to abut against the side wall of the insert body after abutting against the upper side wall of the first resistance increasing insert, the first linkage block is plugged in the first plug-in groove after the upper mold core and the lower mold core are closed, and the first reset spring is arranged between the lower mold core and the first resistance increasing insert and forces the free end of the first resistance increasing insert to rotate away from the insert placing groove in a normal state.
[0014] By adopting the above technical scheme, after the insert body is pre-positioned, during the closing of the mold, the first guide slope of the first linkage block abuts against the upper side wall of the first resistance increasing insert during the lowering of the lower mold core, the first guide slope forces the free end of the first resistance increasing insert to rotate towards the limiting platform, the first pushing part pushes the insert body to slide along the width direction of the insert body and abuts against the limiting platform, at this time, the first reset spring has elastic potential energy, after the mold is opened after the injection is completed, the first reset spring forces the free end of the first resistance increasing insert to rotate away from the insert placing groove after the lower mold core rises and is separated from the first resistance increasing insert, the first pushing part of the first resistance increasing insert is separated from the outer side wall of the insert body, the damping fixing constraint on the insert body is automatically released, and the subsequent demolding operation of the insert product is facilitated.
[0015] Preferably, the upper end face of the lower die core is provided with a second installation groove, the second installation groove has a notch communicated with the inner side wall of the insert placing groove, the lower die core is provided with a second resistance increasing insert embedded in the second installation groove, the second resistance increasing insert has elasticity, the lower part of the second resistance increasing insert is hinged to the inner wall of the second installation groove, the upper part of the second resistance increasing insert has a second pushing part passing through the notch and abutting against the side wall of the insert body, and the upper die core is provided with a second linkage block forcing the second pushing part of the second resistance increasing insert to abut against the side wall of the insert body so that the insert body moves along the length direction.
[0016] By using the above technical scheme, during the closing of the upper die core and the lower die core, the second linkage block forces the free end of the second resistance increasing insert to rotate towards the direction close to the insert placing groove, during the rotation of the free end of the second resistance increasing insert, the second pushing part passes through the notch and abuts against the side wall of the insert body so that the insert body slides along the length direction thereof to the set position, the position of the insert body in the insert placing groove is fixed in a damping mode, and the freedom of the insert body sliding along the length direction thereof is restricted, thereby reducing the possibility of displacement of the insert body during the injection molding.
[0017] Preferably, the second linkage block is protrudingly fixed to the lower end face of the upper die core, the upper end face of the lower die core is provided with a second plug-in groove communicated with the inner wall of the second installation groove away from the insert placing groove, the second linkage block has a second guide slope abutting against the upper part side wall of the second resistance increasing insert and forcing the second pushing part to abut against the side wall of the insert body, after the closing of the upper die core and the lower die core, the second linkage block is plugged into the second plug-in groove, and the lower die core and the second resistance increasing insert are provided with a second reset spring forcing the free end of the second resistance increasing insert to rotate away from the direction of the insert placing groove in a normal state.
[0018] By using the above technical scheme, after the positioning of the insert body, during the closing of the mold, during the lowering of the lower die core, the second guide slope of the second linkage block abuts against the upper part side wall of the second resistance increasing insert, the lower die core continues to lower, the second guide slope forces the free end of the second resistance increasing insert to rotate towards the direction close to the notch, the second pushing part pushes the insert body to slide along the length direction thereof, and the outer peripheral wall of the positioning column abuts against the inner side wall of the first positioning hole, at this time, the second reset spring has elastic potential energy, after the mold is opened, after the lower die core rises and is separated from the second resistance increasing insert, the second reset spring forces the free end of the second resistance increasing insert to rotate away from the direction of the notch, the second pushing part of the second resistance increasing insert is separated from the outer side wall of the insert body, the damping fixing constraint on the insert body is automatically released, and the subsequent demolding operation of the insert product is facilitated.
[0019] Preferably, the fixed mold is provided with a mounting cavity below the lower mold core, and the fixed mold is provided with an ejection mechanism, which comprises a ejector rod plate vertically slidingly connected to the mounting cavity, a plurality of ejector rods fixedly connected to the ejector rod plate, and an ejector rod driving member for driving the ejector rod plate to slide up and down, the bottom inner wall of the insert placement groove is provided with an ejector rod hole through which the ejector rod slides, and the axial direction of the ejector rod is parallel to the axial direction of the positioning column.
[0020] By adopting the above technical scheme, after the lower mold core and the upper mold core are opened, when the insert product is ejected, the ejector rod driving member drives the ejector rod plate to rise, the ejector rod plate drives the ejector rod to pass through the ejector rod hole and abut against the lower end surface of the insert body, the ejector rod plate continues to rise, the insert product is ejected out of the insert placement groove, the outer peripheral wall of the insert product is separated from the inner side wall of the lower forming cavity and the inner side wall of the insert placement groove, and the insert product is convenient for manual taking.
[0021] Preferably, the upper end surface of the lower mold core is rotatably connected with a rotating shaft located on one side of the insert placement groove, the rotating shaft is fixedly connected with a limiting plate, the lower mold core is provided with a driving member for driving the rotating shaft to rotate, the lower end surface of the free end of the limiting plate abuts against the upper end surface of the insert body, and the lower end surface of the upper mold core is provided with an avoiding groove for inserting the limiting plate.
[0022] By adopting the above technical scheme, before injection molding, the rotating shaft is controlled to rotate by the driving member, so that the limiting plate is rotated to a position where it does not interfere with the placement of the insert body, then the insert body is placed in the insert placement groove of the lower mold core, and the positioning column is inserted into the first positioning hole, so that the positioning of the insert body in the insert placement groove is realized, the possibility of displacement of the insert body during injection molding is reduced, then the rotating shaft is controlled to rotate to reset by the driving member, so that the lower end surface of the free end of the limiting plate abuts against the upper end surface of the insert body, on the one hand, the detection of whether the insert body is completely placed in the insert placement groove is realized, and the possibility of the insert body not being completely placed in the insert placement groove is reduced, on the other hand, the vertical sliding freedom of the insert body is constrained by the limiting plate, so that the possibility of the insert body floating up during injection molding is reduced, the possibility of displacement of the insert body during injection molding is further reduced, and the dimensional accuracy and the qualification rate of the insert product are ensured; after injection molding is completed, when the insert product is ejected, the rotating shaft is controlled to rotate by the driving member, so that the limiting plate is rotated to a position where it does not interfere with the placement of the insert body, and then the insert product is taken.
[0023] Preferably, in normal state, the ejector rod sinks in the inner wall of the bottom of the insert placing groove, the lower die core and the fixed mold are provided with a rope passing channel, the fixed mold is rotationally connected with a reversing wheel located below the installation cavity, the driving component comprises a connecting rope and a limiting torsional spring, one end of the connecting rope is fixedly connected to the free end side wall of the limiting plate, the other end of the connecting rope sequentially passes through the rope passing channels of the lower die core and the fixed mold, is arranged around the lower peripheral wall of the reversing wheel and is fixed to the ejector plate, and the limiting torsional spring forces the rotating shaft to rotate so that the free end of the limiting plate extends above the insert placing groove in normal state.
[0024] By adopting the technical scheme, in normal state, the free end of the limiting plate extends above the insert placing groove, before injection molding, the ejector driving component drives the ejector plate to ascend by a distance and the ejector rod still does not protrude from the insert placing groove, the free end of the limiting plate is rotated around the axis of the rotating shaft by the connecting rope, at this time, the limiting torsional spring has elastic potential energy, so that after the limiting plate is rotated to a position not interfering with the placement of the insert body, the insert body is placed in the insert placing groove of the lower die core and the positioning column is inserted into the first positioning hole, then the ejector driving component drives the ejector plate to descend and reset, the limiting torsional spring forces the limiting plate to rotate and reset, so that the lower end surface of the free end of the limiting plate abuts against the upper end surface of the insert body; after the lower die core and the upper die core are opened, when the insert finished product is demolded, the ejector driving component drives the ejector plate to ascend by a distance, after the limiting plate is rotated to a position not interfering with the placement of the insert body, the ejector driving component continues to drive the ejector plate to ascend by a distance, the ejector rod protrudes from the inner wall of the bottom of the insert placing groove, the insert finished product is ejected from the insert placing groove, and then the insert finished product is taken.
[0025] In order to reduce the possibility of displacement of the insert body, the second purpose of the present application is to provide an injection molding process applied to a sunroof mechanical assembly front lifting arm injection mold.
[0026] An injection molding process applied to a sunroof mechanical assembly front lifting arm injection mold, comprising the following steps:
[0027] Step S1, injection preparation, applying release agent in the upper molding cavity of the upper die core and the lower molding cavity of the lower die core, and cleaning the surface of the insert body;
[0028] Step S2, placing the insert body in the insert placing groove, inserting the positioning column into the first positioning hole, and realizing the pre-positioning of the insert body and the insert placing groove;
[0029] Step S3, the upper die core and the lower die core are closed, and during the descending of the lower die core, the first guide inclined surface of the first linkage block abuts against the upper side wall of the first resistance increasing insert, the lower die core continues to descend, the first guide inclined surface forces the free end of the first resistance increasing insert to rotate towards the direction of approaching the limiting table, so that the first pushing part pushes the insert body to slide along the width direction of the insert body and abuts against the limiting table; the second guide inclined surface of the second linkage block abuts against the upper side wall of the second resistance increasing insert, the lower die core continues to descend, the second guide inclined surface forces the free end of the second resistance increasing insert to rotate towards the direction of approaching the gap, so that the second pushing part pushes the insert body to slide along the length direction of the insert body, so that the outer peripheral wall of the positioning column abuts against the inner side wall of the first positioning hole, at this time, the first reset spring and the second reset spring both have elastic potential energy;
[0030] Step S4, injection molding operation, the injection hole is subjected to injection molding operation through the hot runner system;
[0031] Step S5, cooling and opening the mold, after the lower die core rises and is separated from the first resistance increasing insert, the first reset spring forces the free end of the first resistance increasing insert to rotate away from the direction of approaching the insert placing groove, so that the first pushing part of the first resistance increasing insert is separated from the outer side wall of the insert body, and the damping and fixing constraint on the insert body is automatically released; after the lower die core rises and is separated from the second resistance increasing insert, the second reset spring forces the free end of the second resistance increasing insert to rotate away from the direction of approaching the gap, so that the second pushing part of the second resistance increasing insert is separated from the outer side wall of the insert body, and the damping and fixing constraint on the insert body is automatically released, facilitating the subsequent demolding operation of the insert finished product;
[0032] Step S6, demolding operation.
[0033] In summary, the present application has at least one of the following beneficial technical effects:
[0034] 1. Before injection molding, the insert body is placed in the insert placing groove of the lower die core, and the positioning column is inserted into the first positioning hole, so that the positioning of the insert body in the insert placing groove is realized, the possibility of displacement of the insert body in the injection molding process is reduced, the dimensional accuracy and the qualification rate of the insert finished product are ensured, in addition, after the upper die core and the lower die core are closed, the lower end surface of the upper die core abuts against the upper end surface of the insert body, the purpose of constraining the vertical sliding freedom of the insert body by the upper die core is achieved, so that the possibility of floating of the insert body in the injection molding process is reduced, the possibility of displacement of the insert body in the injection molding process is further reduced, and the dimensional accuracy and the qualification rate of the insert finished product are ensured;
[0035] 2. After the positioning of the insert body, when the mold is closed, the first guide slope of the first linkage block abuts against the upper sidewall of the first resistance increasing insert during the descent of the lower mold core, and the lower mold core continues to descend, the first guide slope forces the free end of the first resistance increasing insert to rotate towards the direction of approaching the limiting platform, so that the first pushing part pushes the insert body to slide along the width direction of the insert body and abuts against the limiting platform, at this time, the first reset spring has elastic potential energy, after the injection is completed, when the lower mold core rises and is separated from the first resistance increasing insert, the first reset spring forces the free end of the first resistance increasing insert to rotate towards the direction of moving away from the insert placing groove, so that the first pushing part of the first resistance increasing insert is separated from the outer sidewall of the insert body, and the damping fixing constraint on the insert body is automatically released, facilitating the subsequent demolding operation of the insert product;
[0036] 3. Before injection, the driving member controls the rotation of the rotating shaft, so that the limiting plate is rotated to a position that does not interfere with the placement of the insert body, then the insert body is placed in the insert placing groove of the lower mold core, and the positioning column is inserted into the first positioning hole, so that the positioning of the insert body in the insert placing groove is realized, and the possibility of displacement of the insert body during the injection molding process is reduced, then the driving member controls the rotating shaft to rotate back, so that the lower end surface of the free end of the limiting plate abuts against the upper end surface of the insert body, on the one hand, the detection of whether the insert body is completely placed into the insert placing groove is realized, and the possibility of incomplete placement of the insert body into the insert placing groove is reduced, on the other hand, the vertical sliding degree of freedom of the insert body is constrained by the limiting plate, so that the possibility of floating of the insert body during the injection process is reduced, the possibility of displacement of the insert body during the injection molding process is further reduced, and the dimensional accuracy and qualification rate of the insert product are ensured; after the injection is completed, the insert product is demolded, the driving member controls the rotating shaft to rotate, so that the limiting plate is rotated to a position that does not interfere with the placement of the insert body, and then the insert product is taken. BRIEF DESCRIPTION OF DRAWINGS
[0037] Figure 1 is a schematic diagram of the overall structure of a front lifting arm injection mold of a sunroof mechanical assembly in Example 1.
[0038] Figure 2 is a schematic diagram of the structure of the lower mold core and the insert body in Example 1.
[0039] Figure 3 is a schematic diagram of the structure of the upper mold core in Example 1.
[0040] Figure 4 is a schematic diagram of the structure of the first resistance increasing insert and the second resistance increasing insert in Example 1.
[0041] Figure 5 is Figure 4 is a local enlarged schematic view at A.
[0042] Figure 6 is a structural schematic diagram of the ejector plate in Example 1.
[0043] Figure 7 is a structural schematic diagram of the fixed die in Example 2.
[0044] Figure 8 is a structural schematic diagram of the lower die core in Example 2.
[0045] Figure 9 is Figure 8 is a partial enlarged schematic view at B.
[0046] Figure 10 is a structural schematic diagram of the upper die core in Example 2.
[0047] Figure 11 is a structural schematic diagram of the injection molded product of the front arm in the background art.
[0048] BRIEF DESCRIPTION OF DRAWINGS 1, fixed die; 11, mounting cavity; 12, second fixed plate; 13, reversing wheel; 2, movable die; 3, lower die core; 31, positioning groove; 32, insert placement cavity; 321, positioning column; 322, ejector pin hole; 33, lower molding cavity; 34, limiting table; 35, first mounting slot; 36, first resistance increasing insert; 361, first pushing part; 362, first reset spring; 37, first plug-in slot; 38, second mounting slot; 381, notch; 39, second resistance increasing insert; 391, second pushing part; 392, second reset spring; 30, second plug-in slot; 301, fixed slot; 302, rotating shaft; 303, limiting plate; 4, upper die core; 41, positioning protrusion; 42, upper molding cavity; 43, second positioning hole; 44, injection hole; 45, first linkage block; 451, first guide inclined surface; 46, second linkage block; 461, second guide inclined surface; 47, avoiding slot; 5, insert body; 51, cladding part; 52, exposed part; 53, first positioning hole; 54, flow hole; 50, plastic part; 6, hot runner plate; 7, demolding mechanism; 71, ejector plate; 711, first fixed plate; 72, ejector pin; 73, hydraulic oil cylinder; 8, driving part; 81, limiting torsional spring; 82, connecting rope. DETAILED DESCRIPTION
[0049] The following will be described in detail in combination with the accompanying Figures 1-11 The present application is further described in detail.
[0050] Example 1:
[0051] With reference to Figure 1 , the embodiment of the present application discloses a sunroof mechanical group assembly front arm injection mold, with reference to Figure 1 , Figure 2, including a fixed mold 1, a movable mold 2 located above the fixed mold 1, a lower mold core 3 mounted on the fixed mold 1 by bolts, and an upper mold core 4 mounted on the movable mold 2 by bolts, the upper mold core 4 is located above the lower mold core 3, the lower mold core 3 is placed with an insert body 5, the insert body 5 is arranged in a strip shape, and the insert body 5 has a covering part 51 and an exposed part 52.
[0052] Referring to Figure 2 , Figure 3 , four corners of the upper end surface of the lower mold core 3 are provided with positioning grooves 31, and the lower end surface of the upper mold core 4 is provided with positioning protrusions 41 inserted into the positioning grooves 31. The upper end surface of the lower mold core 3 is provided with an insert placing groove for placing the exposed part 52 of the insert body 5, in the embodiment, the insert placing groove is provided with two and is symmetrically distributed along the width direction of the lower mold core 3, the upper end surface of the lower mold core 3 is provided with a lower forming cavity 33 communicated with the insert placing groove, and the depth of the lower forming cavity 33 is greater than that of the insert placing groove. The lower end surface of the upper mold core 4 is provided with an upper forming cavity 42 corresponding to the position of the lower forming cavity 33, the lower end surface of the exposed part 52 of the insert body 5 abuts against the bottom inner wall of the insert placing groove, and the upper end surface of the insert body 5 is flush with the upper end surface of the lower mold core 3.
[0053] The bottom inner wall of the insert placing groove is provided with a positioning column 321, the axial direction of the positioning column 321 is vertically arranged, in the embodiment, the positioning column 321 is provided with two and is distributed along the length direction of the insert placing groove. The upper part of the positioning column 321 is arranged in a conical shape, the upper end surface of the insert body 5 is correspondingly provided with a first positioning hole 53 for inserting the positioning column 321, and the diameter of the first positioning hole 53 is greater than the maximum diameter of the positioning column 321 so that the first positioning hole 53 and the positioning column 321 are gap-fitted. The upper end surface of the positioning column 321 protrudes from the upper end surface of the lower mold core 3, and the lower end surface of the upper mold core 4 is correspondingly provided with a second positioning hole 43 for inserting the positioning column 321.
[0054] When the staff places the insert body 5 in the insert placing groove, the positioning column 321 is inserted into the first positioning hole 53, and after the pre-positioning of the insert body 5 and the insert placing groove, the covering part 51 of the insert body 5 extends above the lower forming cavity 33, the insert body 5 has a liquid flow gap between the outer side wall of the covering part 51 and the inner side wall of the injection cavity, the upper end surface of the insert body 5 located at the covering part 51 is provided with a liquid flow hole 54, and the liquid flow hole 54 is provided with a plurality of. After the upper mold core 4 and the lower mold core 3 are closed, the lower end surface of the upper mold core 4 abuts against the upper end surface of the insert body 5 and the upper end surface of the lower mold core 3, and the upper forming cavity 42 and the lower forming cavity 33 form a closed injection cavity for injection operation on the covering part 51 of the insert body 5.
[0055] Referring to Figure 1 , Figure 3The upper mold core 4 has an injection hole 44 that connects to the injection cavity. The upper end face of the moving mold 2 is equipped with a hot runner template 6. The hot runner template 6 is equipped with a heat collection pipe system for injection operation of the injection hole 44. The heat collection pipe system is existing technology and will not be described in detail here.
[0056] Reference Figure 2 , Figure 3 , Figure 4 The lower mold core 3 is provided with a limiting platform 34 that protrudes from the inner sidewalls of the two insert placement slots and is close to each other, so that the insert body 5 can abut against the outer sidewall of the exposed portion 52. The upper end surface of the limiting platform 34 is flush with the upper end surface of the lower mold core 3. The upper end surface of the lower mold core 3 is provided with a first mounting groove 35, which is connected to the inner sidewall of the insert placement slot away from the limiting platform 34. The lower mold core 3 is provided with a first resistance-increasing insert 36 built into the first mounting groove 35. The first resistance-increasing insert 36 is made of rubber and has elasticity. The lower part of the first resistance-increasing insert 36 is hinged to the inner wall of the first mounting groove 35 by a pivot pin, and the upper part of the first resistance-increasing insert 36 has a first pushing part 361 that abuts against the sidewall of the insert body 5 located in the exposed portion 52. The first resistance-increasing insert 36 is provided with a first reset spring 362 that forces the free end of the first resistance-increasing insert 36 to rotate away from the insert placement groove under normal conditions. The first reset spring 362 can be a torsion spring or a glass ball screw. In this embodiment, the first reset spring 362 is a first glass ball screw. The first glass ball screw is fixed to the middle of the first resistance-increasing insert 36, and the glass ball end of the first glass ball screw abuts against the inner side wall of the first mounting groove 35 near the insert placement groove.
[0057] The upper mold core 4 is provided with a first pushing part 361 that forces the first resistance-increasing insert 36 to press against the side wall of the insert body 5, so that the insert body 5 moves along the width direction and abuts against the limiting platform 34. The first linkage block 45 protrudes and is fixed to the lower end face of the upper mold core 4. The first linkage block 45 has a first guide slope 451 that, after abutting against the upper side wall of the first resistance-increasing insert 36, forces the first pushing part 361 to press against the side wall of the insert body 5 located in the exposed part 52. The upper end face of the lower mold core 3 is provided with a first insertion groove 37 that connects to the inner wall of the first mounting groove 35 away from the insert placement groove. After the upper mold core 4 and the lower mold core 3 are closed, the first linkage block 45 is inserted into the first insertion groove 37. The first guide slope 451 forces the free end of the first resistance-increasing insert 36 to rotate toward the direction close to the limiting table 34, so that the first pushing part 361 pushes the insert body 5 to slide along its own width direction and abut against the side wall of the limiting table 34, thereby fixing the insert body 5 in a damping manner.
[0058] Reference Figure 3 , Figure 4 , Figure 5The upper end surface of the lower die core 3 is provided with a second installation slot 38, two second installation slots 38 are arranged, the second installation slot 38 is provided with a notch 381 connected to the inner side wall of the insert placing slot, the lower die core 3 is provided with a second resistance-increasing insert 39 embedded in the second installation slot 38, two second resistance-increasing inserts 39 are arranged correspondingly, the second resistance-increasing insert 39 is made of rubber and has elasticity, the lower part of the second resistance-increasing insert 39 is hinged to the inner wall of the second installation slot 38 through a rotating shaft pin, and the upper part of the second resistance-increasing insert 39 has a second pushing part 391 passing through the notch 381 and used for abutting against the side wall of the insert body 5. The lower die core 3 is provided with a second reset spring 392 which forces the free end of the second resistance-increasing insert 39 to rotate away from the insert placing slot in a normal state, the second reset spring 392 can be a torsion spring or a glass bead screw, in the embodiment, the second reset spring 392 is a second glass bead screw, the second glass bead screw is fixed to the middle part of the second resistance-increasing insert 39, and the glass bead end of the second glass bead screw abuts against the inner side wall of the second installation slot 38 close to the insert placing slot.
[0059] The upper die core 4 is provided with a second linkage block 46 which forces the second pushing part 391 of the second resistance-increasing insert 39 to abut against the side wall of the exposed part 52 of the insert body 5 so that the insert body 5 moves along the length direction. The second linkage block 46 protrudes and is fixed to the lower end surface of the upper die core 4, the upper end surface of the lower die core 3 is provided with a second insertion slot 30 connected to the inner wall of the second installation slot 38 away from the insert placing slot, the second linkage block 46 has a second guide inclined surface 461 abutting against the upper part side wall of the second resistance-increasing insert 39 and then forcing the second pushing part 391 to abut against the side wall of the insert body 5, and the second guide inclined surface 461 is arranged with two second guide inclined surfaces 461 for simultaneously controlling the rotation of the two second resistance-increasing inserts 39. When the upper die core 4 and the lower die core 3 are closed, the second linkage block 46 is inserted into the second insertion slot 30, the second guide inclined surface 461 of the second linkage block 46 abuts against the upper part side wall of the second resistance-increasing insert 39, the lower die core 3 continues to descend, the second guide inclined surface 461 forces the free end of the second resistance-increasing insert 39 to rotate towards the notch 381, so that the second pushing part 391 pushes the insert body 5 to slide along the length direction of the insert body 5, and the outer peripheral wall of the positioning column 321 abuts against the inner side wall of the first positioning hole 53 to fix the insert body 5 in a damping form.
[0060] Referring to Figure 1 , Figure 6The fixed mold 1 is provided with a mounting cavity 11 below the lower mold core 3, and the fixed mold 1 is provided with a demolding mechanism 7, which comprises a ejector rod plate 71 slidably connected to the mounting cavity 11 in the vertical direction, a plurality of ejector rods 72 fixedly connected to the upper end face of the ejector rod plate 71, and an ejector driving element for driving the ejector rod plate 71 to slide up and down. The bottom inner wall of the insert placement groove is provided with an ejector hole 322 for the ejector rod 72 to slide through, and the axial direction of the ejector rod 72 is parallel to the axial direction of the positioning column 321. The side wall of the ejector rod plate 71 is fixedly connected with a first fixed plate 711 which is externally connected to the mounting cavity 11. The outer side wall of the fixed mold 1 is fixedly connected with a second fixed plate 12. The ejector driving element is a hydraulic oil cylinder 73, the cylinder body of which is fixedly connected to the second fixed plate 12, and the piston rod of the hydraulic oil cylinder 73 is fixedly connected to the first fixed plate 711.
[0061] An injection molding process applied to a front lifting arm injection mold of a sunroof mechanical assembly: comprising the following steps:
[0062] Step S1, injection preparation, applying demolding agent in the upper molding cavity 42 of the upper mold core 4 and the lower molding cavity 33 of the lower mold core 3, and cleaning the surface of the insert body 5.
[0063] Step S2, placing the insert body 5 in the insert placement groove, and inserting the positioning column 321 into the first positioning hole 53 to realize the pre-positioning of the insert body 5 and the insert placement groove.
[0064] Step S3, clamping the upper mold core 4 and the lower mold core 3, in the process of lowering the lower mold core 3, the first guide slope 451 of the first linkage block 45 abuts against the upper side wall of the first resistance increasing insert 36, the lower mold core 3 continues to descend, the first guide slope 451 forces the free end of the first resistance increasing insert 36 to rotate towards the limiting table 34, so that the first pushing part 361 pushes the insert body 5 to slide along the width direction of the insert body 5 and abuts against the limiting table 34; the second guide slope 461 of the second linkage block 46 abuts against the upper side wall of the second resistance increasing insert 39, the lower mold core 3 continues to descend, the second guide slope 461 forces the free end of the second resistance increasing insert 39 to rotate towards the gap 381, so that the second pushing part 391 pushes the insert body 5 to slide along the length direction of the insert body 5, so that the outer circumferential wall of the positioning column 321 abuts against the inner side wall of the first positioning hole 53. At this time, the first reset spring 362 and the second reset spring 392 both have elastic potential energy.
[0065] Step S4, injection operation, injecting the injection hole 44 through the hot runner system.
[0066] Step S5, after the lower die core 3 rises and is separated from the first resistance insert 36, the first reset spring 362 forces the free end of the first resistance insert 36 to rotate away from the direction of the insert placing groove, so that the first pushing part 361 of the first resistance insert 36 is separated from the outer side wall of the insert body 5, and the damping fixing constraint on the insert body 5 is automatically released; after the lower die core 3 rises and is separated from the second resistance insert 39, the second reset spring 392 forces the free end of the second resistance insert 39 to rotate away from the direction of the notch 381, so that the second pushing part 391 of the second resistance insert 39 is separated from the outer side wall of the insert body 5, and the damping fixing constraint on the insert body 5 is automatically released, facilitating the subsequent demolding operation of the insert finished product.
[0067] Step S6, demolding operation, when the insert finished product is demolded, the piston rod of the hydraulic oil cylinder 73 is retracted to drive the ejector plate 71 to rise, the ejector plate 71 drives the ejector rod 72 to pass through the ejector hole 322 and abut against the lower end face of the insert body 5, the ejector plate 71 continues to rise to eject the insert finished product out of the insert placing groove, so that the outer peripheral wall of the insert finished product is separated from the inner side wall of the lower forming cavity 33 and the inner side wall of the insert placing groove, and the insert finished product is manually taken out.
[0068] Embodiment 2
[0069] With reference to Figure 7 The difference between the present embodiment and embodiment 1 is that in the non-working state, the ejector rod 72 sinks in the bottom inner wall of the insert placing groove, the lower die core 3 and the fixed die 1 both have a rope passing channel, the rope passing channel of the lower die core 3 is communicated with the fixed groove 301, the rope passing channel of the fixed die 1 is communicated with the outer side wall of the fixed die 1, and the outer side wall of the fixed die 1 is rotationally connected with the reversing wheel 13 located below the mounting cavity 11.
[0070] With reference to Figure 8 , Figure 9 The upper end face of the lower die core 3 is provided with a fixed groove 301 located between the two insert placing grooves, the fixed groove 301 is communicated with the insert placing groove, the bottom inner wall of the first fixed groove 301 is rotationally connected with a rotating shaft 302, the axial direction of the rotating shaft 302 is vertically arranged, the upper outer peripheral wall of the rotating shaft 302 is fixedly connected with a limiting plate 303, and the limiting plate 303 protrudes from the upper end face of the lower die core 3. The lower die core 3 is provided with a driving component 8 for driving the rotating shaft 302 to rotate, the lower end face of the free end of the limiting plate 303 abuts against the upper end face of the exposed part 52 of the insert body 5, and the lower end face of the upper die core 4 is provided with an avoiding groove 47 for inserting the limiting plate 303.
[0071] With reference to Figure 7 , Figure 8 , Figure 9The driving component 8 comprises a connecting rope 82 and a limiting torsion spring 81. The connecting rope 82 is a steel wire rope. One end of the connecting rope 82 is fixedly connected to the free end side wall of the limiting plate 303. The other end of the connecting rope 82 passes through the rope passing channel of the lower die core 3 and the fixed die 1 in sequence, is arranged around the lower peripheral wall of the reversing wheel 13, and is fixed to the ejector plate 71. The connecting rope 82 is partially exposed to the fixed die 1. The limiting torsion spring 81 is sleeved on the rotating shaft 302. One end of the limiting torsion spring 81 is fixedly connected to the inner wall of the bottom of the fixed groove 301. The other end of the limiting torsion spring 81 is fixedly connected to the outer peripheral wall of the rotating shaft 302. The limiting torsion spring 81 forces the rotating shaft 302 to rotate, so that the free end of the limiting plate 303 extends above the insert placing groove in the normal state.
[0072] The implementation principle of the embodiment 2 is as follows. In the normal state, the free end of the limiting plate 303 extends above the insert placing groove. Before injection molding, the hydraulic cylinder 73 drives the ejector plate 71 to rise by a distance, and the ejector rod 72 does not protrude from the insert placing groove. The free end of the limiting plate 303 is rotated around the axis of the rotating shaft 302 by pulling the connecting rope 82. At this time, the limiting torsion spring 81 has elastic potential energy, so that the limiting plate 303 is rotated to a position that does not interfere with the placement of the insert body 5. Then, the insert body 5 is placed in the insert placing groove of the lower die core 3, and the positioning column 321 is inserted into the first positioning hole 53. Then, the hydraulic cylinder 73 drives the ejector plate 71 to descend to reset. The limiting torsion spring 81 forces the limiting plate 303 to rotate to reset, so that the lower end surface of the free end of the limiting plate 303 abuts against the upper end surface of the insert body 5.
[0073] After the lower die core 3 and the upper die core 4 are opened, when the insert finished product is demolded, the hydraulic cylinder 73 drives the ejector plate 71 to rise by a distance. After the limiting plate 303 is rotated to a position that does not interfere with the placement of the insert body 5, the ejector driving component continues to drive the ejector plate 71 to rise by a distance. The ejector rod 72 protrudes from the inner wall of the bottom of the insert placing groove, and the insert finished product is ejected from the insert placing groove. Then, the insert finished product is taken.
[0074] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application. Therefore, equivalent changes made on the basis of the structure, shape, and principle of the present application should be covered by the protection scope of the present application.
Claims
1. An injection mold for the front lifting arm of a sunroof mechanical assembly, characterized in that: The device includes a fixed mold (1), a movable mold (2) located above the fixed mold (1), a lower mold core (3) installed on the fixed mold (1), and an upper mold core (4) installed on the movable mold (2). The upper mold core (4) is located above the lower mold core (3). The upper end face of the lower mold core (3) has an insert placement groove for placing the insert body (5). The upper end face of the lower mold core (3) has a lower molding cavity (33) connected to the insert placement groove. The lower end face of the upper mold core (4) has an upper molding cavity (42) corresponding to the position of the lower molding cavity (33). The insert body (5) The lower end face of the insert body (5) abuts against the inner bottom wall of the insert placement groove. The insert body (5) extends into the lower molding cavity (33) to form a covering part (51). The lower end face of the upper mold core (4) abuts against the upper end face of the insert body (5) and the lower mold core (3). The upper molding cavity (42) and the lower molding cavity (33) form a closed injection cavity. The upper mold core (4) and / or the lower mold core (3) are provided with injection holes (44) communicating with the injection cavity. There is a flow gap between the outer side wall of the insert body (5) and the inner side wall of the injection cavity. The bottom inner wall of the insert placement groove is provided with a positioning protrusion. The insert body (5) has a first positioning hole (53) for the positioning post (321) to be inserted; the fixed mold (1) has an installation cavity (11) located below the lower mold core (3), and the fixed mold (1) is provided with a demolding mechanism (7). The demolding mechanism (7) includes an ejector plate (71) that slides vertically and is connected to the installation cavity (11), a number of ejector rods (72) that are fixedly connected to the ejector plate (71), and an ejector driving component that drives the ejector plate (71) to slide and rise. The bottom inner wall of the insert placement groove is provided with a hole for the ejector rods (72). The ejector pin hole (322) is slidably inserted, and the axial direction of the ejector pin rod (72) is parallel to the axial direction of the positioning pin (321). The upper end face of the lower mold core (3) is rotatably connected to a rotating shaft (302) located on one side of the insert placement groove. The rotating shaft (302) is fixedly connected to a limiting plate (303). The lower mold core (3) is provided with a driving component (8) for driving the rotating shaft (302) to rotate. The lower end face of the free end of the limiting plate (303) abuts against the upper end face of the insert body (5). The lower end face of the upper mold core (4) is provided with a relief groove (47) for the limiting plate (303) to be inserted.Under normal conditions, the ejector pin (72) is recessed into the bottom inner wall of the insert placement slot. Both the lower mold core (3) and the fixed mold (1) have rope-threading channels. The fixed mold (1) is rotatably connected to a reversing wheel (13) located below the mounting cavity (11). The driving component (8) includes a connecting rope (82) and a limiting torsion spring (81). One end of the connecting rope (82) is fixedly connected to the free end side wall of the limiting plate (303). The other end of the connecting rope (82) passes sequentially through the rope-threading channels of the lower mold core (3) and the fixed mold (1), wraps around the lower circumferential wall of the reversing wheel (13), and is fixed to the ejector pin plate (71). The limiting torsion spring (81) forces the rotating shaft (302) to rotate, causing the free end of the limiting plate (303) to extend above the insert placement slot under normal conditions.
2. The injection mold for the front lifting arm of a sunroof mechanical assembly according to claim 1, characterized in that: The covering part (51) has a through-hole (54), and there are multiple through-holes (54).
3. The injection mold for the front lifting arm of a sunroof mechanical assembly according to claim 1, characterized in that: The first positioning hole (53) and the positioning post (321) are fitted with a clearance. The lower mold core (3) is provided with a limiting platform (34) that protrudes from the inner sidewall of the insert placement groove so that the outer sidewall of the insert body (5) can abut against it. The upper end face of the lower mold core (3) is provided with a first mounting groove (35). The first mounting groove (35) is connected to the inner sidewall of the insert placement groove away from the limiting platform (34). The lower mold core (3) is provided with a first resistance-increasing insert (36) built into the first mounting groove (35). The insert (36) is elastic. The lower part of the first resistance-increasing insert (36) is hinged to the inner wall of the first mounting groove (35). The upper part of the first resistance-increasing insert (36) has a first pushing part (361) that abuts against the side wall of the insert body (5). The upper mold core (4) is provided with a first linkage block (45) that forces the first pushing part (361) of the first resistance-increasing insert (36) to press against the side wall of the insert body (5) so that the insert body (5) moves along the width direction and abuts against the limiting stage (34).
4. The injection mold for the front lifting arm of a sunroof mechanical assembly according to claim 3, characterized in that: The first linkage block (45) protrudes and is fixed to the lower end face of the upper mold core (4). The upper end face of the lower mold core (3) is provided with a first insertion groove (37) that connects to the inner wall of the first mounting groove (35) away from the insert placement groove. The first linkage block (45) has a first guide slope (451) that abuts against the upper side wall of the first resistance-increasing insert (36) and forces the first pushing part (361) to press against the side wall of the insert body (5). After the upper mold core (4) and the lower mold core (3) are closed, the first linkage block (45) is inserted into the first insertion groove (37). A first reset spring (362) is provided between the lower mold core (3) and the first resistance-increasing insert (36) to force the free end of the first resistance-increasing insert (36) to rotate away from the insert placement groove under normal conditions.
5. The injection mold for the front lifting arm of a sunroof mechanical assembly according to claim 3, characterized in that: The upper end face of the lower mold core (3) is provided with a second mounting groove (38). The second mounting groove (38) has a notch (381) that communicates with the inner side wall of the insert placement groove. The lower mold core (3) is provided with a second resistance-increasing insert (39) built into the second mounting groove (38). The second resistance-increasing insert (39) is elastic. The lower part of the second resistance-increasing insert (39) is hinged to the inner wall of the second mounting groove (38). The upper part of the second resistance-increasing insert (39) has a second pushing part (391) that passes through the notch (381) and abuts against the side wall of the insert body (5). The upper mold core (4) is provided with a second linkage block (46) that forces the second pushing part (391) of the second resistance-increasing insert (39) to press against the side wall of the insert body (5) so that the insert body (5) moves along the length direction.
6. The injection mold for the front lifting arm of a sunroof mechanical assembly according to claim 5, characterized in that: The second linkage block (46) protrudes and is fixed to the lower end face of the upper mold core (4). The upper end face of the lower mold core (3) is provided with a second insertion groove (30) that connects to the inner wall of the second mounting groove (38) away from the insert placement groove. The second linkage block (46) has a second guide slope (461) that abuts against the upper side wall of the second resistance-increasing insert (39) and forces the second pushing part (391) to press against the side wall of the insert body (5). After the upper mold core (4) and the lower mold core (3) are closed, the second linkage block (46) is inserted into the second insertion groove (30). A second reset spring (392) is provided between the lower mold core (3) and the second resistance-increasing insert (39) to force the free end of the second resistance-increasing insert (39) to rotate away from the insert placement groove under normal conditions.
7. An injection molding process applied to the injection mold of the front lifting arm of a sunroof mechanical assembly as described in claim 6, characterized in that: Includes the following steps: Step S1: Injection preparation. Apply release agent to the upper molding cavity (42) of the upper mold core (4) and the lower molding cavity (33) of the lower mold core (3), and clean the surface of the insert body (5). Step S2: Place the insert body (5) in the insert placement slot and insert the positioning post (321) into the first positioning hole (53) to achieve the pre-positioning of the insert body (5) and the insert placement slot; Step S3: The upper mold core (4) and lower mold core (3) are closed. During the descent of the lower mold core (3), the first guide slope (451) of the first linkage block (45) abuts against the upper side wall of the first resistance-increasing insert (36). The lower mold core (3) continues to descend, and the first guide slope (451) forces the free end of the first resistance-increasing insert (36) to rotate toward the limiting table (34), so that the first pushing part (361) pushes the insert body (5) to slide along its own width direction and abut against the limiting table (34); the second linkage block (46) The second guide slope (461) abuts against the upper side wall of the second resistance insert (39). The lower mold core (3) continues to descend. The second guide slope (461) forces the free end of the second resistance insert (39) to rotate toward the notch (381), so that the second push part (391) pushes the insert body (5) to slide along its own length direction, so that the outer peripheral wall of the positioning post (321) abuts against the inner side wall of the first positioning hole (53). At this time, both the first reset spring (362) and the second reset spring (392) have elastic potential energy. Step S4, injection molding operation: Injection molding operation is performed on the injection hole (44) through the heat collector system; Step S5: Cooling and mold opening. After the lower mold core (3) rises and disengages from the first resistance-increasing insert (36), the first reset spring (362) forces the free end of the first resistance-increasing insert (36) to rotate away from the insert placement slot, so that the first pushing part (361) of the first resistance-increasing insert (36) disengages from the outer wall of the insert body (5), automatically releasing the damping and fixing constraint on the insert body (5); after the lower mold core (3) rises and disengages from the second resistance-increasing insert (39), the second reset spring (392) forces the free end of the second resistance-increasing insert (39) to rotate away from the notch (381), so that the second pushing part (391) of the second resistance-increasing insert (39) disengages from the outer wall of the insert body (5), automatically releasing the damping and fixing constraint on the insert body (5), facilitating the subsequent demolding operation of the insert finished product; Step S6: Demolding.
Citation Information
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