Multi-section sliding block bent pipe injection mold and injection molding method

Abstract

The injection mold comprises a rear mold, the rear mold comprises a fixing base, a product cavity is formed in the upper end face of the fixing base, and a core pulling mechanism is arranged on the fixing base; the core pulling mechanism comprises a driving part, the driving part is connected with the fixed seat, a sliding seat is arranged at the output end of the driving part, a curve insert is arranged on the sliding seat, and the driving part is used for driving the sliding seat to slide so as to drive the curve insert to extend into or out of the product cavity; a first air inlet is formed in the side wall of the sliding seat and used for being externally connected with a cooling air source, a plurality of first air outlets are formed in the side, close to the bend insert, of the sliding seat and used for blowing air towards the bend insert, and a first air channel is formed in the sliding seat and communicated with the first air inlet and the first air outlets. According to the mold, the bend insert can be cooled, the service life of the mold is prolonged, the machining efficiency is improved, and the efficient production and machining requirements are met.

Description

Technical Field

[0001] The invention relates to the technical field of injection molds, and in particular to a multi-section slider elbow injection mold and an injection molding method. Background Art

[0002] With the diversification of plastic products, more and more plastic products will have curved pipes. Compared with other types of solid structures, curved demolding has more technical difficulties in mold design. Patent publication number: CN117047993A discloses a curved tube demolding structure for a curved tube forming mold, which drives the linkage component to move by a single-sided oil cylinder to drive the demolding slider. The linkage component will pull all the curved sliders to slide on the demolding guide rail; until the demolding slider and all the curved sliders are pulled out of the product cavity, completing the demolding process of the curved tube plastic product. This solution can reduce the overall volume of the mold, thereby reducing the production cost, making it suitable for use in small injection molding equipment.

[0003] However, in the above scheme, since the diameter of the multi-section curved slider is small and each slider is designed with a connecting block inside, there is no space for designing cooling water; moreover, during the injection molding process, the following process is usually used for injection molding: injection → pressure holding → natural cooling → mold opening → curved core pulling → plastic product ejection → mold closing, and continuous injection molding production is carried out. Due to the lack of a cooling system for the curved slider in the mold, after a period of mold production, as the temperature of the curved slider increases, the coordination between the curved slider and the demolding guide rail will not be smooth; the movement resistance increases, and the connecting piece is easily pulled off, resulting in the mold being unable to produce normally, and the mold needs to be stopped for maintenance, which seriously affects the mold production efficiency.

[0004] It can be seen that the above-mentioned mold structure and injection molding process need to be improved. Summary of the invention

[0005] In order to solve some or all of the problems existing in the above-mentioned prior art, on the one hand, the present invention provides a multi-section slider elbow injection mold, comprising a front mold and a rear mold, the front mold and the rear mold can be connected in an opening and closing manner, the rear mold comprises a fixed seat, a product cavity is provided on the upper end surface of the fixed seat, and a core pulling mechanism is provided on the fixed seat; the core pulling mechanism comprises a driving member, the driving member is connected to the fixed seat, a sliding seat is provided on the output end of the driving member, and a curve insert is provided on the sliding seat, the driving member is used to drive the sliding seat to slide on the fixed seat, and then drive the curve insert to extend into or out of the product cavity; a first air inlet is provided on the side wall of the sliding seat, the first air inlet is used for an external cooling air source, a plurality of first air outlets are provided on the side wall of the sliding seat close to the curve insert, the first air outlet is used for blowing air in the direction of the curve insert, and a first air duct is provided in the sliding seat, and the first air duct is respectively connected with the first air inlet and the first air outlet.

[0006] As a further improvement of the present invention, a slide groove adapted to the sliding seat is provided on the fixed seat, the sliding seat is slidably limitedly connected to the slide groove, and the sliding seat can pull the curve insert into the slide groove.

[0007] As a further improvement of the present invention, a second air inlet is provided on the side wall of the fixed seat, and the second air inlet is used for an external cooling air source. A plurality of second air outlets are provided on the slide groove, and the second air outlets are used to blow air in the direction of the curve insert. A second air duct is provided on the fixed seat, and the second air duct is respectively connected to the second air inlet and the second air outlet.

[0008] As a further improvement of the present invention, a guide rail is provided on the fixed seat, one end of the guide rail passes through the sliding seat and extends into the curve insert, and slidingly cooperates with the curve insert, and an arc-shaped guide portion is provided at the end of the guide rail extending into the curve insert.

[0009] As a further improvement of the present invention, the curved insert includes a plurality of curved sliders connected in sequence, the outer side walls of the curved sliders are in an arc shape, and the curvature of the outer side walls of the curved sliders is the same as the curvature of the arc-shaped guide portion.

[0010] On the other hand, the present invention also provides an injection molding method using the above-mentioned injection mold, comprising the following steps:

[0011] S1: installing the front mold and the rear mold on the injection molding machine respectively, and making the first air inlet and the second air inlet communicate with the external cooling air source respectively;

[0012] S2: The injection molding machine drives the front mold and the rear mold to close together to complete the mold closing;

[0013] S3: The injection molding machine injects the rubber into the product cavity. After the injection is completed, the injection molding machine maintains the pressure for a period of time;

[0014] S4: The injection molding machine drives the front mold and the rear mold to separate and complete the mold opening;

[0015] S5: Control the driving member to work, drive the sliding seat to slide in the slide groove, drive the curved insert to move in the direction of extending out of the product cavity, so that the curved insert completes the product core pulling;

[0016] While the curved insert is being pulled out, the cooling gas source is controlled to inject cooling gas into the first air inlet, and the cooling gas flows into the first air outlet through the first air channel, and blows air toward the curved insert through the first air outlet to cool the curved insert;

[0017] S6: When the core pulling of the curved insert is completed, the cooling gas source is controlled to inject cooling gas into the second air inlet, and the cooling gas flows into the second air outlet through the second air channel, and blows air toward the curved insert through the second air outlet to cool the curved insert;

[0018] S7: eject the product from the rear mold to complete the demoulding of the plastic part;

[0019] S8: Control the driving part to work, drive the sliding seat to reset, and drive the curved insert to re-extend into the product cavity;

[0020] S9: Repeat steps S2-S8.

[0021] As a further improvement of the present invention, in step S3, the holding time is 3 seconds.

[0022] As a further improvement of the present invention, in step S6, the blowing time of the second air outlet is 20 seconds.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention provides a first air outlet on a side of the sliding seat close to the curved insert. Air is blown toward the curved insert through the first air outlet, so as to cool the curved insert, thereby reducing the occurrence of mold failure due to increased temperature and extending the service life of the mold; reducing the number of mold maintenance times, improving processing efficiency, and meeting efficient production and processing needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the present invention or the solutions in the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 Schematic diagram of the three-dimensional structure of the rear mold in an embodiment of the present invention;

[0027] Figure 2 is a schematic side view of the rear mold in an embodiment of the present invention;

[0028] Figure 3 yes Figure 2 Schematic diagram of the AA section structure;

[0029] Figure 4 yes Figure 2 Schematic diagram of the structure of the middle BB section;

[0030] Figure 5 1 is a flow chart of a mold injection molding method in an embodiment of the present invention. DETAILED DESCRIPTION

[0031] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs; the terms used in the specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present invention or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0032] Reference to "embodiments" in the present invention means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive, independent, or alternative to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present invention may be combined with other embodiments.

[0033] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0034] like Figure 1-5 As shown, a multi-section slider elbow injection mold includes a front mold and a rear mold, and the front mold and the rear mold are connected in an openable and closable manner. The rear mold includes a fixed seat 1, and a product cavity 2 is provided on the upper end surface of the fixed seat 1. The fixed seat 1 is provided with a core pulling mechanism, and the core pulling mechanism is used to perform core pulling operations on the product in the product cavity 2.

[0035] The core pulling mechanism includes a driving member 3, and in this embodiment, the driving member 3 is a hydraulic cylinder. The driving member 3 is fixedly mounted on the fixed seat 1, and a sliding seat 4 is provided on the output end of the driving member 3, and a curved insert 5 is installed on the sliding seat 4. The driving member 3 is used to drive the sliding seat 4 to slide on the fixed seat 1, thereby driving the curved insert 5 to extend into or out of the product cavity 2. During specific processing, by controlling the operation of the driving member 3, the sliding seat 4 can be driven to slide on the fixed seat 1, thereby pushing or pulling the curved insert 5 to move, so that the curved insert 5 extends into or out of the product cavity 2, and the curved insert 5 is reset and the core pulling operation of the plastic product is realized.

[0036] A first air inlet 41 is provided on the side wall of the sliding seat 4, and the first air inlet 41 is used for connecting an external cooling air source. A plurality of first air outlets 42 are provided on the side wall of the sliding seat 4 close to the curve insert 5. The first air outlets 42 are symmetrically distributed on the left and right sides of the curve insert 5. The first air outlets 42 are used to blow air in the direction of the curve insert 5. A first air duct 43 is provided in the sliding seat 4, and the first air duct 43 is respectively connected to the first air inlet 41 and the first air outlet 42. During specific processing, after the injection molding is completed, the injection molding machine drives the mold to open, and then controls the driving part 3 to drive the sliding seat 4 to move, driving the bend insert 5 to extend out of the product cavity 2 to complete the core pulling; at the same time, the external cooling air source is controlled to inject cooling gas into the first air inlet 41, and the cooling gas flows into the first air duct 43 through the first air inlet 41, and then blows in the direction of the bend insert 5 through the first air outlet 42, thereby cooling the bend insert 5; in this way, the temperature of the bend insert 5 is reduced, and the occurrence of mold failure caused by the high temperature of the bend insert 5 is reduced, thereby extending the processing time of the mold and improving the processing efficiency.

[0037] In order to improve the stability of transmission, in this embodiment, a slide groove 11 adapted to the sliding seat 4 is provided on the fixed seat 1, and the sliding seat 4 is interactively limitedly connected with the slide groove 11. The movement direction of the sliding seat 4 is limited and guided by the slide groove 11 to ensure that the sliding seat 4 can smoothly complete the product core pulling and the resetting of the curve insert 5; and in specific work, after the sliding seat 4 pulls the curve insert 5 out of the product cavity 2 to complete the core pulling, the sliding seat 4 can pull the curve insert 5 out into the slide groove 11.

[0038] In order to further cool down the bend insert 5, a second air inlet 12 is provided on the side wall of the fixed seat 1, and the second air inlet 12 is used to connect to an external cooling air source. A plurality of second air outlets 13 are provided on the slide 11, and the second air outlets 13 are used to blow air in the direction of the bend insert 5. A second air duct 14 is provided on the fixed seat 1, and the second air duct 14 is connected with the second air inlet 12 and the second air outlet 13 respectively. When the sliding seat 4 pulls the bend insert 5 to complete the product core pulling, the sliding seat 4 will drive the bend insert 5 into the slide 11; at this time, the external cooling air source is controlled to inject cooling gas into the second air inlet 12, and the cooling gas flows into the second air duct 14 through the second air inlet 12, and then blows air in the direction of the bend insert 5 through the second air outlet 13, thereby cooling down the bend insert 5 and further reducing the temperature of the bend insert 5. The blowing through the first air outlet 42 and the second air outlet 13 can control the temperature of the curved insert 5 at a suitable temperature after the injection molding is completed, so as to avoid the transmission failure caused by the temperature rise. According to the actual measurement by the applicant, after the blowing through the first air outlet 42 and the second air outlet 13, the temperature of the curved insert 5 can be controlled within 50°C, which is completely within the range that the material of the curved insert 5 can withstand.

[0039] A guide rail 6 is provided on the fixed seat 1. One end of the guide rail 6 passes through the sliding seat 4 and then extends into the curved insert 5. The guide rail 6 is used to limit and guide the movement direction of the curved insert 5 extending into or out of the product cavity 2. The end of the guide rail 6 extending into the curved insert 5 is provided with an arc-shaped guide portion 61. The other end of the guide rail 6 is parallel to the driving direction of the driving member 3. The driving member 3 can drive the curved insert 5 to slide on the guide rail 6. Specifically, when the mold is closed, the driving member 3 drives the curved insert 5 to move in the direction of extending into the product cavity 2. The curved insert 5 is limited and guided by the guide rail 6, and first slides linearly on the guide rail 6. When the curved insert 5 moves to the arc-shaped guide portion 61, it rotates along the shape of the arc-shaped guide portion 61, so that the curved insert 5 slides into the product cavity 2. When demolding by core pulling, the driving member 3 is controlled to drive the curved insert 5 to move in the direction of extending out of the product cavity 2. The curved insert 5 is limited by the arc-shaped guide portion 61 and will rotate first until the curved insert 5 is separated from the arc-shaped guide portion 61. Then, as the driving member 3 continues to drive, it will slide linearly on the guide rail 6 until the curved insert 5 is pulled out of the product cavity 2, thereby completing the core pulling and demolding of the bent tube plastic product.

[0040] The curved insert 5 includes a plurality of curved sliders 51 connected in sequence, the outer wall of the curved slider 51 is in an arc shape, and the curvature of the outer wall of the curved slider 51 is the same as the curvature of the arc-shaped guide portion 61; in other words, when the driving member 3 drives the curved insert 5 to extend into the product cavity 2, each curved slider 51 also extends into the curve in the product cavity 2, and at this time, the center of each curved slider 51 coincides with the center of the product cavity 2, thereby facilitating the injection molding of the curved tube. The curved insert 5 in this embodiment is similar in structure to the demoulding slider and linkage assembly in Patent Publication No. CN117047993A, so the specific structure of the curved insert 5 is not described in detail herein.

[0041] The injection molding method using the above multi-section slider elbow injection mold is as follows:

[0042] First, the front mold and the rear mold are respectively installed on the injection molding machine, and the first air inlet hole 41 and the second air inlet hole 12 are respectively connected to the external cooling air source.

[0043] When injection molding starts, the injection molding machine is controlled to drive the front mold and the rear mold to close to complete the mold closing.

[0044] Then the injection molding machine is controlled to inject the rubber into the mold, and the rubber flows into the product cavity 2 through the runner; after the injection is completed, the injection molding machine is controlled to maintain the pressure for 3 seconds, so that the product cavity 2 can be fully filled with rubber to ensure the processing yield.

[0045] Then the injection molding machine is controlled to drive the mold to open, so that the front mold and the rear mold are separated to complete the mold opening.

[0046] After the mold is opened, the driving member 3 is controlled to work, driving the sliding seat 4 to slide in the slide groove 11, driving the curved insert 5 to move in the direction of extending out of the product cavity 2, so that the curved insert 5 extends out of the plastic product under the guidance of the guide rail 6, and the core pulling of the plastic product is completed; in the process of core pulling of the curved insert 5, the cooling air source is controlled to continuously inject cooling gas into the first air inlet 41, and the cooling gas flows into the first air outlet 42 through the first air duct 43, and blows air to the curved insert 5 through the first air outlet 42 to cool the curved insert 5.

[0047] After the bend insert 5 completes the core pulling of the product, the sliding seat 4 drives the bend insert 5 into the slide groove 11, and then controls the cooling gas source to inject cooling gas into the second air inlet 12, and the cooling gas flows into the second air outlet 13 through the second air channel 14, and blows air to the bend insert 5 through the second air outlet 13 to cool the bend insert 5. It should be noted that after the second air outlet 13 blows air for 20 seconds, the cooling gas source is controlled to stop injecting cooling gas into the first air inlet 41 and the second air inlet 12 respectively; in other words, the second air outlet 13 blows air for 20 seconds to cool the bend insert 5 to a suitable temperature.

[0048] After the curved insert 5 completes the core pulling of the product, the demoulding mechanism of the rear mold is controlled to push the plastic product out of the rear mold, so that the plastic product is separated from the product cavity 2, and the demoulding of the plastic product is completed.

[0049] After the product is demoulded, the driving member 3 is controlled to work to drive the sliding seat 4 to move in the opposite direction in the sliding groove 11, so that the sliding seat 4 is reset and the curved insert 5 is driven to re-extend into the product cavity 2 for the next round of injection molding.

[0050] By repeating the above processing process, continuous processing and injection molding can be achieved; and the curve insert 5 can be maintained within a temperature range not exceeding 50°C, so that it can continue to work for a long time, thereby increasing the service life of the mold and meeting the production needs of efficient processing.

[0051] The above-mentioned specific implementation is a preferred implementation of the present invention, and is not intended to limit the specific implementation scope of the present invention. The scope of the present invention includes but is not limited to this specific implementation. All equivalent changes made in accordance with the present invention are within the protection scope of the present invention.

Claims

1. A multi-section slider elbow injection mold, characterized in that: It includes a front mold and a rear mold, the front mold is connected to the rear mold in an openable and closable manner, the rear mold includes a fixed seat, a product cavity is provided on the upper end surface of the fixed seat, and a core pulling mechanism is provided on the fixed seat; The core pulling mechanism includes a driving member, the driving member is connected to the fixed seat, a sliding seat is provided on the output end of the driving member, a curved insert is provided on the sliding seat, and the driving member is used to drive the sliding seat to slide on the fixed seat, thereby driving the curved insert to extend into or out of the product cavity; A first air inlet is provided on the side wall of the sliding seat, and the first air inlet is used for connecting to an external cooling air source. A plurality of first air outlets are provided on the side wall of the sliding seat close to the curve insert, and the first air outlets are used for blowing air toward the curve insert. A first air duct is provided in the sliding seat, and the first air duct is respectively connected to the first air inlet and the first air outlet.

2. The multi-section slider elbow injection mold according to claim 1, characterized in that: The fixed seat is provided with a slide groove adapted to the sliding seat, the sliding seat is slidably limitedly connected to the slide groove, and the sliding seat can pull the curve insert into the slide groove.

3. The multi-section slider elbow injection mold according to claim 2, characterized in that: A second air inlet is provided on the side wall of the fixing seat, and the second air inlet is used for connecting to an external cooling air source. A plurality of second air outlets are provided on the slide groove, and the second air outlets are used for blowing air toward the curve insert. A second air duct is provided on the fixing seat, and the second air duct is respectively connected to the second air inlet and the second air outlet.

4. The multi-section slider elbow injection mold according to claim 3, characterized in that: The fixed seat is provided with a guide rail, one end of which passes through the sliding seat and extends into the curved insert, and slides with the curved insert. An arc-shaped guide portion is provided at one end of the guide rail extending into the curved insert.

5. The multi-section slider elbow injection mold according to claim 4, characterized in that: The curved insert comprises a plurality of curved sliders connected in sequence, the outer side walls of the curved sliders are in an arc shape, and the curvature of the outer side walls of the curved sliders is the same as the curvature of the arc-shaped guide portion.

6. An injection molding method using the multi-section slider elbow injection mold according to any one of claims 3 to 5, characterized in that: The following steps are involved: S1: installing the front mold and the rear mold on the injection molding machine respectively, and making the first air inlet and the second air inlet communicate with the external cooling air source respectively; S2: The injection molding machine drives the front mold and the rear mold to close together to complete the mold closing; S3: The injection molding machine injects the rubber into the product cavity. After the injection is completed, the injection molding machine maintains the pressure for a period of time; S4: The injection molding machine drives the front mold and the rear mold to separate and complete the mold opening; S5: Control the driving member to work, drive the sliding seat to slide in the slide groove, drive the curved insert to move in the direction of extending out of the product cavity, so that the curved insert completes the product core pulling; While the curved insert is being pulled out, the cooling gas source is controlled to inject cooling gas into the first air inlet, and the cooling gas flows into the first air outlet through the first air channel, and blows air toward the curved insert through the first air outlet to cool the curved insert; S6: When the core pulling of the curved insert is completed, the cooling gas source is controlled to inject cooling gas into the second air inlet, and the cooling gas flows into the second air outlet through the second air channel, and blows air toward the curved insert through the second air outlet to cool the curved insert; S7: eject the product from the rear mold to complete the demoulding of the plastic part; S8: Control the driving part to work, drive the sliding seat to reset, and drive the curved insert to re-extend into the product cavity; S9: Repeat steps S2-S8.

7. The injection molding method according to claim 6, characterized in that: In step S3, the pressure holding time is 3 seconds.

8. The injection molding method according to claim 6, characterized in that: In step S6, the blowing time of the second air outlet is 20 seconds.

Images