CN114131848A

CN114131848A - Automobile wire harness buckle plastic part injection mold

Info

Publication number: CN114131848A
Application number: CN202111441100.4A
Authority: CN
Inventors: 方迪成; 蒋燕; 邓集华; 盘广林
Original assignee: SHANTOU POLYTECHNICAL
Current assignee: SHANTOU POLYTECHNICAL
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2022-03-04

Abstract

An injection mold for an automobile wire harness buckle plastic part comprises a fixed mold, a movable mold and a bilateral ejection mechanism; the fixed die comprises a fixed die seat, a fixed die core, a sprue bushing and a fixed die insert group; the movable mould comprises a movable mould seat, a movable mould, a mould foot, a movable mould core and a movable mould insert group; the bilateral ejection mechanism comprises an upper support guide pillar, a first upper ejector plate, a first lower ejector plate, a lower support guide pillar, a second upper ejector plate, a second lower ejector plate and a nylon rubber plug, wherein a plurality of first ejector pins are arranged on the first lower ejector plate, and the first ejector pins penetrate through corresponding first pin holes of the fixed die, the fixed die core and the fixed die insert group; the first lower ejector plate is provided with a first return needle, and the nylon rubber plug is fixed on the first return needle and is in interference fit with the movable mold; and a plurality of second thimbles are arranged on the second upper thimble plate and penetrate through corresponding second pinholes of the driven die, the movable die core and the movable die insert group. The invention can complete the injection molding of the automobile wire harness buckle plastic part and ensure that the surface of the plastic part is not damaged in the demolding process.

Description

Automobile wire harness buckle plastic part injection mold

Technical Field

The invention relates to an injection mold, in particular to an injection mold for an automobile wire harness buckle plastic part.

Background

As is well known, an injection mold is a common mold for molding plastic parts, and various plastic parts can be molded by the injection mold to meet various requirements of people. And because of various technological requirements of the plastic part, structures such as holes or grooves need to be formed in the side wall of the plastic part, and correspondingly, the injection mold is provided with corresponding side core-pulling mechanisms and ejection mechanisms so as to perform side core-pulling and ejection actions on the molded product by means of the side core-pulling mechanisms and the ejection mechanisms in the mold opening process, thereby achieving the purpose of forming structures such as holes or grooves on the molded product.

The automobile wiring harness buckle plastic part is a key component of an automobile wiring harness system, is an important assembly part and needs to be produced in large quantities. As shown in fig. 5, the automobile wire harness buckle plastic part 50 comprises a wire harness seat 501, a wire harness movable fastener 502, an inverted disc 503, a clamping connecting rod 504 and a plurality of inverted clamping blades 505, wherein the overall dimension of the automobile wire harness buckle plastic part is 40.98mm × 22.1mm × 20 mm, the average wall thickness of a product is about 1.1mm, the maximum thickness is about 3.5mm, the thinnest part is 0.5 mm of inverted clamping blade, and the volume is 1.6 × 10³mm²The size of the plastic part is smaller, but the structure is more complex, and the plastic part is required after being molded: the surface is smooth, no burr is generated, the buckle is not damaged, the clamping force reaches a preset target value, the characteristics of good mechanical strength, toughness and the like are required, and other parts have no obvious defect traces. However, because the automobile wiring harness buckle plastic part is a product with a clamping part having a circle of internal inverted hook structure characteristics and a plastic part main body section without a demoulding angle due to product structure requirements, if the mould is directly opened, a cavity part can be damaged by drawing or even can not be demoulded due to mould sticking; if the injection mold only adopts the conventional side core-pulling mechanism and the conventional straight ejection mechanism to demold the plastic part, the surface of the plastic part is easy to be damaged, such as the defect traces of contraction print, burr, ejection mark and the like, and the main body section of the plastic part has no defectsThe demoulding angle, the clamping blade glue position is thin, the space is small, and a sliding block type core-pulling demoulding structure cannot be adopted, so that the mould is obviously unsuitable.

Disclosure of Invention

The invention aims to solve the technical problem of providing an injection mold for an automobile wire harness buckle plastic part, which can complete injection molding of the automobile wire harness buckle plastic part and can ensure that the surface of the plastic part is not damaged in the demolding process. The technical scheme is as follows:

an injection mold for an automobile wiring harness buckle plastic part comprises a fixed mold and a movable mold, wherein the movable mold is arranged right below the fixed mold and matched with the fixed mold; the fixed die comprises a fixed die seat, a fixed die core, a sprue and at least one fixed die insert group, the fixed die is arranged on the fixed die seat, the fixed die core and the sprue are both arranged on the fixed die, and the fixed die insert group is arranged on the fixed die core; the movable mould comprises a movable mould seat, a movable mould, a mould pin, a movable mould core and at least one movable mould insert group, the movable mould is arranged on the movable mould seat through the mould pin, the movable mould core is arranged on the movable mould, and the movable mould insert group is arranged on the movable mould core; the method is characterized in that: the automobile wiring harness buckle plastic part injection mold further comprises a bilateral ejection mechanism, the bilateral ejection mechanism comprises an upper support guide pillar, a first upper ejector plate, a first lower ejector plate, a lower support guide pillar, a second upper ejector plate, a second lower ejector plate and at least one nylon rubber plug, the upper support guide pillar is arranged between the fixed mold base and the fixed mold, the first upper ejector plate and the first lower ejector plate can be slidably mounted on the upper support guide pillar, the first lower ejector plate is located below the first upper ejector plate, a plurality of first ejector pins are arranged on the first lower ejector plate, a plurality of first needle holes are formed in corresponding positions of part of inserts of the fixed mold, the fixed mold core and the fixed mold insert group, and the first ejector pins sequentially penetrate through corresponding first needle holes in the part of inserts of the fixed mold, the fixed mold core and the fixed mold insert group; the first lower ejector plate is also provided with at least one first return needle, the nylon rubber plugs are fixed on the corresponding first return needles, the top surface of the movable die is provided with at least one mounting hole, the number of the mounting holes is the same as that of the nylon rubber plugs, the mounting holes correspond to the nylon rubber plugs one by one, and the heads of the nylon rubber plugs are positioned in the corresponding mounting holes and are in interference fit with the inner walls of the mounting holes; the lower supporting guide pillar is arranged between the movable die holder and the movable die, the second upper ejector plate and the second lower ejector plate are slidably mounted on the lower supporting guide pillar, the second lower ejector plate is located below the second upper ejector plate, a plurality of second ejector pins are arranged on the second upper ejector plate, a plurality of second needle holes are formed in corresponding positions of the movable die, the movable die core and part of the movable die insert group, and the second ejector pins sequentially penetrate through corresponding second needle holes in the parts of the movable die, the movable die core and the movable die insert group.

In the injection mold for the automobile wiring harness buckle plastic part, the fixed mold forms a cavity part of the injection mold, the fixed mold core and the fixed mold insert group are used for molding the glue position of the upper half part of a product, and the runner passes through the fixed mold insert group and the sprue; the movable mould forms the core part of the injection mould, the movable mould core and the movable mould insert group are used for forming the lower half part of a product, and the runner passes through the movable mould insert group. Typically, the material selected for injection molding automotive wiring harness snap molding is PA66 (BASF Ultramid A3K) having a density of 1.13g/cm³The shrinkage rate is 1-2%, the temperature range of the die forming is 40-60 ℃, the temperature range of the melt is 280-300 ℃, the high-strength high-hardness high-heat-resistance high-electric-insulation material has high mechanical strength and hardness, high heat resistance, low friction, good rapid running capability, wear resistance, noise and vibration reduction, and excellent processability^[。

After the injection mold completes injection molding of the automobile wiring harness buckle plastic part, when the mold is opened, the movable mold moves downwards under the action of mold opening force of an injection molding machine to be separated from the fixed mold, and because the head of the nylon rubber plug is in interference fit with the inner wall of the mounting hole on the movable mold, the nylon rubber plug moves downwards along with the movable mold under the action of friction force and drives the first upper ejector plate and the first lower ejector plate to move downwards together through the first return pin, each first ejector pin on the first lower ejector plate moves downwards along the corresponding first pin hole respectively to generate downward ejection action on the automobile wiring harness buckle plastic part in the cavity, so that the mold sticking force generated by the plastic part due to no demolding angle can be eliminated by utilizing the action of ejection force, the inverted hook on the plastic part is forcedly separated from the fixed mold embedding part group, and the automobile wiring harness buckle plastic part is smoothly separated from the fixed mold core and the fixed mold embedding part group; subsequently, the movable mold continues to move downwards under the action of the mold opening force of the injection molding machine until the first lower ejector plate is contacted with the fixed mold, the nylon rubber plug is separated from the mounting hole of the driven mold under the action of the first return pin, after the mold opening action is completed, the second upper ejector plate and the second lower ejector plate move upwards under the action force of the ejector rod of the injection molding machine, each second ejector pin on the second upper ejector plate moves upwards along the corresponding second needle hole respectively, upward pushing action force is generated on the automobile wire harness buckle plastic part in the mold core, and ejection is completed under the limitation of the movable mold, so that the automobile wire harness buckle plastic part can be taken out smoothly. The injection mold for the automobile wire harness buckle plastic part can complete injection molding of the automobile wire harness buckle plastic part, ejection force is applied to the molded automobile wire harness buckle plastic part from the two sides of the mold core and the mold cavity by using the bilateral ejection mechanism in the demolding process, and the plastic part can be prevented from being damaged due to forced demolding by using the action of the ejection force and the high mechanical strength and the high hardness of a PA66 material.

Generally, the materials of the fixed mold core, the fixed mold insert, the movable mold core and the movable mold insert are pre-hard plastic mold steel ASSAB 718, the pre-hard plastic mold steel ASSAB 718 has excellent mechanical property, machinability, high hardenability, good electromachinability, dermatoglyph machinability and excellent polishing performance, and the pre-hard plastic mold insert is particularly suitable for mass production of plastic molds, and the factory hardness of the plastic molds is B290-310.

In a preferred scheme, the fixed die insert group comprises a fixed die runner insert, a fixed die blade seat insert and a plurality of fixed die blade inserts; the fixed die runner insert is arranged on the fixed die core, a fixed die runner communicated with the sprue is arranged on the fixed die runner insert, a first strand base forming groove and a first strand movable fastener forming groove are further formed in the fixed die runner insert, the first strand base forming groove is communicated with the tail end of the fixed die runner, and the first strand movable fastener forming groove is communicated with one side of the first strand base forming groove; the fixed die blade seat insert is arranged on the edge of the fixed die runner insert, a gap between the fixed die blade seat insert and the fixed die runner insert forms a first inverted buckle disc forming groove, and the first inverted buckle disc forming groove is communicated with the other side of the first wiring seat forming groove; the fixed die blade seat inserts are provided with a first connecting rod blade forming groove and a plurality of first blade slots which are arranged along the length direction of the first connecting rod blade forming groove, the first connecting rod blade forming groove is communicated with the first back-off disc forming groove, each fixed die blade insert is arranged in the corresponding first blade slot, and two adjacent fixed die blade inserts form a first back-off clamping blade forming groove; the movable mould insert group comprises a movable mould runner insert, a movable mould blade seat insert and a plurality of movable mould blade inserts; the movable mould runner insert is arranged on the movable mould core, a movable mould runner is arranged on the movable mould runner insert, a second wire bundling seat forming groove and a second wire bundling movable fastener forming groove are further formed in the movable mould runner insert, the second wire bundling seat forming groove is communicated with the tail end of the movable mould runner, and the second wire bundling movable fastener forming groove is communicated with one side of the second wire bundling seat forming groove; the movable die blade seat insert is arranged on the edge of the movable die runner insert, a gap between the movable die blade seat insert and the movable die runner insert forms a second inverted buckle disc forming groove, and the second inverted buckle disc forming groove is communicated with the other side of the second wire bundling seat forming groove; the movable mould blade seat insert is provided with a second connecting rod blade forming groove and a plurality of second blade slots arranged along the length direction of the second connecting rod blade forming groove, the second connecting rod blade forming groove is communicated with the second back-off plate forming groove, each movable mould blade insert is arranged in the corresponding second blade slot, and two adjacent movable mould blade inserts form a second back-off clamping blade forming groove. After the movable die and the fixed die are closed, the fixed die insert group and the movable die insert group are matched and jointly enclose a plastic part forming cavity for forming the automobile wiring harness buckle plastic part (the plastic part forming cavity is formed by a first wiring harness seat forming groove, a second wiring harness seat forming groove, a first wiring movable fastener forming groove, a second wiring movable fastener forming groove, a first inverted buckle disc forming groove, a second inverted buckle disc forming groove, a first connecting rod blade forming groove, a second connecting rod blade forming groove, each first blade slot and each second blade slot); then, injecting the injection molding raw material into the fixed mold runner and the movable mold runner through the sprue bushing, and then flowing into the first wiring seat forming groove, the second wiring seat forming groove, the first wiring movable fastener forming groove, the second wiring movable fastener forming groove, the first back-off disc forming groove, the second back-off disc forming groove, the first connecting rod blade forming groove, the second connecting rod blade forming groove, each first blade slot and each second blade slot, forming the wiring seat of the automobile wiring harness buckle plastic part, the wiring movable fastener, the back-off disc, the clamping connecting rod and each back-off clamping blade, and realizing the injection molding of the automobile wiring harness buckle plastic part.

In a further preferred scheme, first bunch of line seat shaping groove, first bunch of line activity fastener shaping groove all are equipped with at least one first pinhole, second bunch of line seat shaping groove, second bunch of line activity fastener shaping groove all are equipped with at least one the second pinhole.

In a further preferred scheme, first back-off joint blade shaping groove be equipped with at least one first pinhole, second back-off joint blade shaping groove be equipped with at least one the second pinhole.

In a preferred scheme, the fixed die insert group is connected with the fixed die core through a plurality of first positioning pins; the movable mould insert group is connected with the movable mould core through a plurality of second positioning pins. Thus, the fixed die insert group and the movable die insert group can be positioned more accurately.

In the preferred scheme, a limiting block is arranged on the second upper ejector plate and is positioned below the movable die and matched with the movable die. During die sinking, the second upper ejector plate and the second lower ejector plate move upwards under the action force of the ejector rod of the injection molding machine, the second ejector on the second upper ejector plate is used for generating upward ejecting action force for the automobile wire harness buckle plastic part in the mold core, and ejecting of the plastic part is completed until the limiting block contacts with the movable mold.

In a preferable scheme, the movable die further comprises a plurality of lower back pins and a plurality of compression springs, and each lower back pin is fixed on the second upper ejector plate; the compression springs are in one-to-one correspondence with the lower return pins in the same number, the compression springs are sleeved on the lower return pins and located between the movable mold and the second upper ejector plate, the upper ends of the compression springs are in close contact with the movable mold, and the lower ends of the compression springs are in close contact with the second upper ejector plate. When the mold is opened, the second upper ejector plate and the second lower ejector plate move upwards under the action of an ejector rod of the injection molding machine, and a compression spring sleeved on the lower return needle is compressed upwards under the action of an ejection force; when the mold is closed in the mold opening state, the ejector rod on the injection molding machine is recovered, the compression spring in the compression state returns to deform and releases elastic potential energy, and the second upper ejector plate and the second lower ejector plate return along with the return and drive the lower return pin fixed on the second upper ejector plate and each second ejector pin to return; then, moving the movable mold upwards and continuing to mold the fixed mold until the lower back stitch is contacted and closed with the end surface of the fixed mold; meanwhile, the nylon rubber plug is inserted into the mounting hole of the movable mold, the first return pin also starts to be contacted and closed with the end face of the movable mold, the first upper ejector plate and the first lower ejector plate also return along with the nylon rubber plug, and finally the parting surface is closed.

In an optimized scheme, the automobile wire harness buckle plastic part injection mold further comprises a guiding and positioning structure, the guiding and positioning structure comprises a plurality of first guiding columns and a plurality of first guide sleeves, each first guiding column is installed on the movable mold, and each first guide sleeve is installed on the fixed mold and is respectively sleeved on the corresponding first guiding column. By adopting the structure, the rapid and accurate guiding of the injection mold in the mold closing process can be realized through the matching between each first guiding column and each first guiding sleeve, and the condition that the fixed mold and the movable mold are matched and dislocated due to the abrasion of the injection mold after long-term production can be prevented.

In a more preferable scheme, the guiding and positioning structure further comprises a plurality of positioning slots formed in the top surface of the movable mold core and a plurality of positioning insertion blocks formed in the bottom surface of the fixed mold core, the positioning insertion blocks and the positioning slots are identical in number and correspond to each other one by one, and the positioning insertion blocks and the positioning slots are in insertion fit. Therefore, the movable mould core and the fixed mould core can be matched more accurately through the insertion and matching between each positioning insertion block and each positioning insertion slot.

In another preferred embodiment, the guiding and positioning structure further includes a plurality of positioning insertion blocks disposed on the top surface of the movable mold core and a plurality of positioning insertion slots disposed on the bottom surface of the fixed mold core, the positioning insertion blocks and the positioning insertion slots are in the same number and are in one-to-one correspondence, and the positioning insertion blocks and the positioning insertion slots are in insertion fit. Therefore, the movable mould core and the fixed mould core can be matched more accurately through the insertion and matching between each positioning insertion block and each positioning insertion slot.

Compared with the prior art, the invention has the following advantages:

after the injection molding of the automobile wire harness buckle plastic part is completed, ejection force can be applied to the molded automobile wire harness buckle plastic part from the two sides of the mold core and the mold cavity by using the bilateral ejection mechanism in the demolding process, and the plastic part can be prevented from being damaged due to forced demolding by using the action of the ejection force and the high mechanical strength and high hardness of a PA66 material.

Drawings

Fig. 1 is a schematic structural diagram of an injection mold for a snap-fit plastic part of an automotive wiring harness according to a preferred embodiment of the invention.

Fig. 2 is a sectional view a-a of fig. 1.

FIG. 3 is a schematic structural diagram of a fixed mold in the injection mold for the automotive wiring harness buckle plastic part shown in FIG. 1.

Fig. 4 is a schematic structural diagram of a movable mold in the injection mold for the automotive wire harness buckle plastic part shown in fig. 1.

Fig. 5 is a schematic structural diagram of the snap-in molding piece of the automobile wiring harness.

Detailed Description

As shown in fig. 1-5, the injection mold for the automobile wiring harness buckle plastic part comprises a fixed mold 1, a movable mold 2 and a bilateral ejection mechanism 3; the fixed die 1 comprises a fixed die seat 11, a fixed die 12, a fixed die core 13, a sprue 14 and a plurality of fixed die insert groups 15, wherein the fixed die 12 is arranged on the fixed die seat 11, the fixed die core 13 and the sprue 14 are both arranged on the fixed die 12, and each fixed die insert group 15 is arranged on the fixed die core 13; the movable die 2 is arranged right below the fixed die 1 and matched with the fixed die 1, the movable die 2 comprises a movable die holder 21, a movable die 22, a die pin 23, a movable die core 24 and a plurality of movable die insert groups 25, the movable die 22 is arranged on the movable die holder 21 through the die pin 23, the movable die core 24 is arranged on the movable die 22, and each movable die insert group 25 is arranged on the movable die core 24; the bilateral ejection mechanism 3 comprises an upper support guide pillar 31, a first upper ejector plate 32, a first lower ejector plate 33, a lower support guide pillar 34, a second upper ejector plate 35, a second lower ejector plate 36 and at least one nylon rubber plug 37, wherein the upper support guide pillar 31 is arranged between the fixed mold base 11 and the fixed mold 12, the first upper ejector plate 32 and the first lower ejector plate 33 can be slidably mounted on the upper support guide pillar 31, the first lower ejector plate 33 is positioned below the first upper ejector plate 32, a plurality of first ejector pins 331 are arranged on the first lower ejector plate 33, a plurality of first pin holes 101 are arranged at corresponding positions of partial inserts of the fixed mold 12, the fixed mold core 13 and the fixed mold insert group 15, and the first ejector pins 331 sequentially penetrate through the corresponding first pin holes 101 on the partial inserts of the fixed mold 12, the fixed mold core 13 and the fixed mold insert group 15; the first lower ejector plate 33 is also provided with at least one first return needle 332, the nylon rubber plugs 37 are fixed on the corresponding first return needle 332, the top surface of the movable mold 22 is provided with at least one mounting hole 221, the number of the mounting holes 221 is the same as that of the nylon rubber plugs 37, the mounting holes 221 correspond to the nylon rubber plugs 37 one by one, and the heads of the nylon rubber plugs 37 are positioned in the corresponding mounting holes 221 and are in interference fit with the inner walls of the mounting holes 221; the lower support guide pillar 34 is arranged between the movable die holder 21 and the movable die 22, the second upper ejector plate 35 and the second lower ejector plate 36 are slidably mounted on the lower support guide pillar 34, the second lower ejector plate 36 is located below the second upper ejector plate 35, a plurality of second ejector pins 351 are arranged on the second upper ejector plate 35, a plurality of second needle holes 201 are arranged in corresponding positions of part inserts of the movable die 22, the movable die core 24 and the movable die insert group 25, and the second ejector pins 351 sequentially penetrate through the corresponding second needle holes 201 in the part inserts of the movable die 22, the movable die core 24 and the movable die insert group 25.

The fixed die 1 forms a cavity part of the injection mold, the fixed die core 13 and the fixed die insert group 15 are used for molding the glue position of the upper half part of a product, and the runner passes through the fixed die insert group 15 and the sprue 14; the movable mold 2 forms a core part of the injection mold, the movable mold core 24 and the movable mold insert group 25 are used for molding the lower half part of a product, and a flow passage passes through the movable mold insert group 25. The material selected for injection molding of the snap molding 50 for automotive wiring harnesses is PA66 (BASF Ultramid A3K) which has a density of 1.13g/cm³The shrinkage rate is 1-2%, the temperature range of the die forming is 40-60 ℃, the temperature range of the melt is 280-300 ℃, the high-strength high-hardness high-heat-resistance high-electric-insulation material has high mechanical strength and hardness, high heat resistance, low friction, good rapid running capability, wear resistance, noise and vibration reduction, and excellent processability^[。

In this embodiment, the fixed mold core 13, the fixed mold insert, the movable mold core 24, and the movable mold insert are all made of pre-hard plastic mold steel ASSAB 718, which has excellent mechanical properties, processability, high hardenability, good electromachinability, dermatoglyph processability, and excellent polishing performance, and is particularly suitable for mass production of plastic molds, and the factory hardness of the plastic molds is B290-310.

In the present embodiment, the fixed die insert group 15 is connected to the fixed die core 13 by a plurality of first positioning pins 16; the movable die insert group 25 and the movable die core 24 are connected by a plurality of second positioning pins 26. Thus, the fixed mold insert set 15 and the movable mold insert set 25 can be positioned more accurately.

In this embodiment, the second upper ejector plate 35 is provided with a stopper 352, and the stopper 352 is located below the movable mold 22 and is engaged with the movable mold 22. When the mold is opened, the second upper ejector plate 35 and the second lower ejector plate 36 move upward under the action of the ejector rod of the injection molding machine, and the second ejector pins 351 on the second upper ejector plate 35 generate upward ejecting action force on the automobile wire harness buckle plastic part 50 in the mold core until the limiting block 352 contacts with the movable mold 22, so that the automobile wire harness buckle plastic part 50 is ejected.

In this embodiment, the movable mold 2 further includes a plurality of lower return pins 27 and a plurality of compression springs 28, and each of the lower return pins 27 is fixed to the second upper ejector plate 35; the number of the compression springs 28 is the same as that of the lower back needles 27, the compression springs 28 correspond to the lower back needles 27 one by one, the compression springs 28 are sleeved on the lower back needles 27 and are positioned between the movable mold 22 and the second upper ejector plate 35, the upper ends of the compression springs 28 are tightly contacted with the movable mold 22, and the lower ends of the compression springs 28 are tightly contacted with the second upper ejector plate 35. When the mold is opened, the second upper ejector plate 35 and the second lower ejector plate 36 move upwards under the action of the ejector rod of the injection molding machine, and the compression spring 28 sleeved on the lower return needle 27 is compressed upwards under the action of the ejector force; when the mold is closed in the mold opening state, the ejector rod on the injection molding machine is recovered, the compression spring 28 in the compression state returns to deform and releases elastic potential energy, and the second upper ejector plate 35 and the second lower ejector plate 36 return to the original positions and drive the lower return needle 27 and each second ejector 351 fixed on the second upper ejector plate to return to the original positions; subsequently, the movable mold 2 moves upwards to be matched with the fixed mold 1 continuously until the lower back stitch 27 starts to contact and close with the end face of the fixed mold 12; meanwhile, the nylon rubber plug 37 is inserted into the mounting hole 221 of the movable mold 22, the first return needle 332 also starts to be in contact with the end face of the movable mold 22 for closing, the first upper ejector plate 32 and the first lower ejector plate 33 also return along with the return, and finally the parting surface is closed.

In the present embodiment, the fixed mold insert group 15 includes a fixed mold runner insert 151, a fixed mold blade holder insert 152, and a plurality of fixed mold blade inserts 153; the fixed die runner insert 151 is mounted on the fixed die core 13, a fixed die runner 1511 communicated with the sprue 14 is formed in the fixed die runner insert 151, the fixed die runner insert 151 is further provided with a first bundling wire seat forming groove 1512 and a first bundling wire movable fastener forming groove 1513, the first bundling wire seat forming groove 1512 is communicated with the tail end of the fixed die runner 1511, and the first bundling wire movable fastener forming groove 1513 is communicated with one side of the first bundling wire seat forming groove 1512; the fixed die blade seat insert 152 is mounted on the edge of the fixed die runner insert 151, a gap between the fixed die blade seat insert 152 and the fixed die runner insert 151 forms a first inverted disc molding groove 154, and the first inverted disc molding groove 154 is communicated with the other side of the first wire holder molding groove 1512; the fixed die blade seat insert 152 is provided with a first connecting rod blade forming groove 1521 and a plurality of first blade slots 1522 which are arranged along the length direction of the first connecting rod blade forming groove 1521, the first connecting rod blade forming groove 1521 is communicated with the first back-off disc forming groove 154, each fixed die blade insert 153 is arranged in the corresponding first blade slot 1522, and two adjacent fixed die blade inserts 153 form a first back-off clamping blade forming groove 155; the movable die insert group 25 comprises a movable die runner insert 251, a movable die blade seat insert 252 and a plurality of movable die blade inserts 253; the movable mold runner insert 251 is mounted on the movable mold core 24, the movable mold runner insert 251 is provided with a movable mold runner 2511, the movable mold runner insert 251 is further provided with a second wire bundling seat forming groove 2512 and a second wire bundling movable fastener forming groove 2513, the second wire bundling seat forming groove 2512 is communicated with the tail end of the movable mold runner 2511, and the second wire bundling movable fastener forming groove 2513 is communicated with one side of the second wire bundling seat forming groove 2512; the movable die blade seat insert 252 is mounted on the edge of the movable die runner insert 251, a second inverted-buckle-disc molding groove 254 is formed in a gap between the movable die blade seat insert 252 and the movable die runner insert 251, and the second inverted-buckle-disc molding groove 254 is communicated with the other side of the second wire harness seat molding groove 2512; the movable mold blade seat insert 252 is provided with a second link blade forming groove 2521 and a plurality of second blade slots 2522 arranged along the length direction of the second link blade forming groove 2521, the second link blade forming groove 2521 is communicated with the second undercut plate forming groove 254, each movable mold blade insert 253 is installed in the corresponding second blade slot 2522, and two adjacent movable mold blade inserts 253 form a second undercut snap-in blade forming groove 255; the first wire bundling seat forming groove 1512 and the first wire bundling movable fastener forming groove 1513 are both provided with at least one first needle hole 101, and the second wire bundling seat forming groove 2512 and the second wire bundling movable fastener forming groove 2513 are both provided with at least one second needle hole 201; the first reverse-buckling clamping blade forming groove 155 is provided with at least one first needle hole 101, and the second reverse-buckling clamping blade forming groove 255 is provided with at least one second needle hole 201. After the movable mold 2 and the fixed mold 1 are matched, the fixed mold insert group 15 and the movable mold insert group 25 are matched and jointly enclose a molding cavity for molding the automobile wire harness buckle molding 50 (the molding cavity is composed of a first wire harness seat molding groove 1512, a second wire harness seat molding groove 2512, a first wire harness movable fastener molding groove 1513, a second wire harness movable fastener molding groove 2513, a first inverted buckle disc molding groove 154, a second inverted buckle disc molding groove 254, a first connecting rod blade molding groove 1521, a second connecting rod blade molding groove 2521, each first blade slot 1522 and each second blade slot 2522); then, the PA66 injection molding material is injected into the fixed mold runner 1511 and the movable mold runner 2511 through the sprue 14, and then flows into the first wire harness seat forming groove 1512, the second wire harness seat forming groove 2512, the first wire harness movable fastener forming groove 1513, the second wire harness movable fastener forming groove 2513, the first inverted buckle disc forming groove 154, the second inverted buckle disc forming groove 254, the first link blade forming groove 1521, the second link blade forming groove 2521, each first blade slot 1522 and each second blade slot 2522, and the wire harness seat 501, the wire harness movable fastener 502, the inverted buckle disc 503, the clamping link 504 and the plurality of inverted clamping blades 505 of the automobile wire harness buckle plastic 50 are molded, so as to realize the injection molding of the automobile wire harness buckle plastic 50.

The injection mold for the automotive wire harness buckle plastic part further comprises a guiding and positioning structure 4, wherein the guiding and positioning structure 4 comprises a plurality of first guiding columns 41, a plurality of first guiding sleeves 42, a plurality of positioning slots 43 arranged on the top surface of the movable mold core 24 and a plurality of positioning insertion blocks 44 arranged on the bottom surface of the fixed mold core 13; each first guide column 41 is installed on the movable mold 22, and each first guide sleeve 42 is installed on the fixed mold 12 and is respectively sleeved on the corresponding first guide column 41; the positioning insertion blocks 44 correspond to the positioning insertion slots 43 in the same number one by one, and the positioning insertion blocks 44 are matched with the positioning insertion slots 43 in an inserted manner. By adopting the structure, the fast and accurate guiding of the injection mold in the mold closing process can be realized through the matching between each first guide column 41 and each first guide sleeve 42 and the inserting matching between each positioning inserting block 44 and each positioning inserting groove 43, and the condition that the fixed mold and the movable mold 2 are matched and dislocated due to the abrasion of the injection mold after long-term production can be prevented.

The working principle of the automobile wire harness buckle plastic part injection mold is briefly described as follows:

after the injection mold finishes the injection molding of the automobile wiring harness buckle plastic part 50, when the mold is opened, the movable mold 2 moves downwards under the action of the mold opening force of the injection molding machine to be separated from the fixed mold 1, because the head of the nylon rubber plug 37 is in interference fit with the inner wall of the mounting hole 221 on the movable mold 22, the nylon rubber plug 37 moves downwards along with the movable mold 22 under the action of friction force, the first upper ejector pin plate 32 and the first lower ejector pin plate 33 are driven to move downwards together by the first return pin 332, each first ejector pin 331 on the first lower ejector pin plate 33 respectively moves downwards along the corresponding first needle hole 101, the automobile wiring harness buckle plastic piece 50 in the cavity is pushed downwards, so that the mold sticking force generated by the automobile wiring harness buckle plastic piece 50 due to no demolding angle can be eliminated by utilizing the action of the pushing force, the barb on the automobile wiring harness buckle plastic piece 50 is forcedly separated from the fixed mold insert group 15, so that the automobile wiring harness snap molding 50 smoothly separates from the fixed die core 13 and the fixed die insert group 15; subsequently, the movable mold 2 continues to move downwards under the action of the mold opening force of the injection molding machine until the first lower ejector plate 33 is contacted with the fixed mold 12, the nylon rubber plug 37 is separated from the mounting hole 221 of the driven mold 22 under the action of the first return pin 332, after the mold opening action is completed, the second upper ejector plate 35 and the second lower ejector plate 36 move upwards under the action of the ejector rod of the injection molding machine (at this time, the compression spring 28 sleeved on the lower return pin 27 is compressed upwards under the action of the ejector force), each second ejector 351 on the second upper ejector plate 35 respectively moves upwards along the corresponding second needle hole 201, upward acting force is generated on the automobile wiring harness buckle plastic part 50 in the mold core, and the ejection is completed under the limitation of the limiting block 352, so that the automobile wiring harness buckle plastic part 50 can be smoothly taken out. When the mold is closed in the mold opening state, the ejector rod on the injection molding machine is recovered, the compression spring 28 in the compression state returns to deform and releases elastic potential energy, and the second upper ejector plate 35 and the second lower ejector plate 36 return to the original positions and drive the lower return needle 27 and each second ejector 351 fixed on the second upper ejector plate to return to the original positions; subsequently, the movable mold 2 moves upwards to be matched with the fixed mold 1 continuously until the lower back stitch 27 starts to contact and close with the end face of the fixed mold 12; meanwhile, the nylon rubber plug 37 is inserted into the mounting hole 221 of the movable mold 22, the first return needle 332 also starts to be in contact with the end face of the movable mold 22 for closing, the first upper ejector plate 32 and the first lower ejector plate 33 also return along with the return, and finally the parting surface is closed.

In addition, it should be noted that the names of the parts and the like of the embodiments described in the present specification may be different, and the equivalent or simple change of the structure, the characteristics and the principle described in the present patent idea is included in the protection scope of the present patent. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.

Claims

1. An injection mold for an automobile wiring harness buckle plastic part comprises a fixed mold and a movable mold, wherein the movable mold is arranged right below the fixed mold and matched with the fixed mold; the fixed die comprises a fixed die seat, a fixed die core, a sprue and at least one fixed die insert group, the fixed die is arranged on the fixed die seat, the fixed die core and the sprue are both arranged on the fixed die, and the fixed die insert group is arranged on the fixed die core; the movable mould comprises a movable mould seat, a movable mould, a mould pin, a movable mould core and at least one movable mould insert group, the movable mould is arranged on the movable mould seat through the mould pin, the movable mould core is arranged on the movable mould, and the movable mould insert group is arranged on the movable mould core; the method is characterized in that: the automobile wiring harness buckle plastic part injection mold further comprises a bilateral ejection mechanism, the bilateral ejection mechanism comprises an upper support guide pillar, a first upper ejector plate, a first lower ejector plate, a lower support guide pillar, a second upper ejector plate, a second lower ejector plate and at least one nylon rubber plug, the upper support guide pillar is arranged between the fixed mold base and the fixed mold, the first upper ejector plate and the first lower ejector plate can be slidably mounted on the upper support guide pillar, the first lower ejector plate is located below the first upper ejector plate, a plurality of first ejector pins are arranged on the first lower ejector plate, a plurality of first needle holes are formed in corresponding positions of part of inserts of the fixed mold, the fixed mold core and the fixed mold insert group, and the first ejector pins sequentially penetrate through corresponding first needle holes in the part of inserts of the fixed mold, the fixed mold core and the fixed mold insert group; the first lower ejector plate is also provided with at least one first return needle, the nylon rubber plugs are fixed on the corresponding first return needles, the top surface of the movable die is provided with at least one mounting hole, the number of the mounting holes is the same as that of the nylon rubber plugs, the mounting holes correspond to the nylon rubber plugs one by one, and the heads of the nylon rubber plugs are positioned in the corresponding mounting holes and are in interference fit with the inner walls of the mounting holes; the lower supporting guide pillar is arranged between the movable die holder and the movable die, the second upper ejector plate and the second lower ejector plate are slidably mounted on the lower supporting guide pillar, the second lower ejector plate is located below the second upper ejector plate, a plurality of second ejector pins are arranged on the second upper ejector plate, a plurality of second needle holes are formed in corresponding positions of the movable die, the movable die core and part of the movable die insert group, and the second ejector pins sequentially penetrate through corresponding second needle holes in the parts of the movable die, the movable die core and the movable die insert group.

2. The automotive wiring harness buckle plastic part injection mold according to claim 1, characterized in that: the fixed die insert group comprises a fixed die runner insert, a fixed die blade seat insert and a plurality of fixed die blade inserts; the fixed die runner insert is arranged on the fixed die core, a fixed die runner communicated with the sprue is arranged on the fixed die runner insert, a first strand base forming groove and a first strand movable fastener forming groove are further formed in the fixed die runner insert, the first strand base forming groove is communicated with the tail end of the fixed die runner, and the first strand movable fastener forming groove is communicated with one side of the first strand base forming groove; the fixed die blade seat insert is arranged on the edge of the fixed die runner insert, a gap between the fixed die blade seat insert and the fixed die runner insert forms a first inverted buckle disc forming groove, and the first inverted buckle disc forming groove is communicated with the other side of the first wiring seat forming groove; the fixed die blade seat inserts are provided with a first connecting rod blade forming groove and a plurality of first blade slots which are arranged along the length direction of the first connecting rod blade forming groove, the first connecting rod blade forming groove is communicated with the first back-off disc forming groove, each fixed die blade insert is arranged in the corresponding first blade slot, and two adjacent fixed die blade inserts form a first back-off clamping blade forming groove; the movable mould insert group comprises a movable mould runner insert, a movable mould blade seat insert and a plurality of movable mould blade inserts; the movable mould runner insert is arranged on the movable mould core, a movable mould runner is arranged on the movable mould runner insert, a second wire bundling seat forming groove and a second wire bundling movable fastener forming groove are further formed in the movable mould runner insert, the second wire bundling seat forming groove is communicated with the tail end of the movable mould runner, and the second wire bundling movable fastener forming groove is communicated with one side of the second wire bundling seat forming groove; the movable die blade seat insert is arranged on the edge of the movable die runner insert, a gap between the movable die blade seat insert and the movable die runner insert forms a second inverted buckle disc forming groove, and the second inverted buckle disc forming groove is communicated with the other side of the second wire bundling seat forming groove; the movable mould blade seat insert is provided with a second connecting rod blade forming groove and a plurality of second blade slots arranged along the length direction of the second connecting rod blade forming groove, the second connecting rod blade forming groove is communicated with the second back-off plate forming groove, each movable mould blade insert is arranged in the corresponding second blade slot, and two adjacent movable mould blade inserts form a second back-off clamping blade forming groove.

3. The automotive wiring harness buckle plastic part injection mold according to claim 2, characterized in that: first bunch of line seat shaping groove, first bunch of line activity fastener shaping groove all are equipped with at least one first pinhole, second bunch of line seat shaping groove, second bunch of line activity fastener shaping groove all are equipped with at least one the second pinhole.

4. The automotive wiring harness buckle plastic part injection mold according to claim 2, characterized in that: first back-off joint blade shaping groove is equipped with at least one first pinhole, second back-off joint blade shaping groove is equipped with at least one the second pinhole.

5. The automotive wiring harness buckle plastic part injection mold according to claim 1, characterized in that: the automobile wire harness buckle plastic part injection mold further comprises a guiding and positioning structure, the guiding and positioning structure comprises a plurality of first guiding columns and a plurality of first guiding sleeves, each first guiding column is installed on the movable mold, and each first guiding sleeve is installed on the fixed mold and is respectively sleeved on the corresponding first guiding column.

6. The automotive wiring harness buckle plastic part injection mold according to claim 5, characterized in that: the guide positioning structure further comprises a plurality of positioning slots arranged on the top surface of the movable mold core and a plurality of positioning insertion blocks arranged on the bottom surface of the fixed mold core, the positioning insertion blocks are the same in number and correspond to the positioning slots one by one, and the positioning insertion blocks are in insertion fit with the positioning slots.

7. The automotive wiring harness buckle plastic part injection mold according to claim 5, characterized in that: the guide positioning structure further comprises a plurality of positioning insertion blocks arranged on the top surface of the movable mold core and a plurality of positioning insertion slots arranged on the bottom surface of the fixed mold core, the positioning insertion blocks and the positioning insertion slots are identical in number and correspond to one another one by one, and the positioning insertion blocks are in insertion fit with the positioning insertion slots.

8. The automotive wiring harness buckle plastic part injection mold according to any one of claims 1 to 7, wherein: the fixed die insert group is connected with the fixed die core through a plurality of first positioning pins; the movable mould insert group is connected with the movable mould core through a plurality of second positioning pins.

9. The automotive wiring harness buckle plastic part injection mold according to any one of claims 1 to 7, wherein: and a limiting block is arranged on the second upper ejector plate and is positioned below the movable die and matched with the movable die.

10. The automotive wiring harness buckle plastic part injection mold according to any one of claims 1 to 7, wherein: the movable mold also comprises a plurality of lower back pins and a plurality of compression springs, and each lower back pin is fixed on the second upper ejector plate; the compression springs are in one-to-one correspondence with the lower return pins in the same number, the compression springs are sleeved on the lower return pins and located between the movable mold and the second upper ejector plate, the upper ends of the compression springs are in close contact with the movable mold, and the lower ends of the compression springs are in close contact with the second upper ejector plate.