Double-layer large ring injection mold

Abstract

The utility model provides a double-layer large-ring injection mold, which relates to the field of injection molding and comprises a front mold structure and a rear mold structure which form an integral injection mold and are used for demolding a product, the lower mold insert consists of a head rubber position and an iron part and is used for rapidly cooling a product; the rear mold thread structure is arranged between the front mold structure and the rear mold structure, so that the product can be left in the rear mold structure; and a parting surface assembly. The opening sequence of the parting surfaces is controlled through the nylon opening and closing device of the parting surface IV, the parting surface I is firstly opened to separate the runner part from the product, and then the parting surface II is opened to separate the front mold insert from the product, so that the wrapping force of the front mold on the product and the deformation of the product are reduced. When the rear mold is demolded, the beryllium copper material at the head glue position of the lower mold insert can quickly cool a product, so that the strength of the product during demolding is enhanced, the problem of ejection deformation caused by incomplete cooling of the product is reduced, and the dimensional accuracy and the appearance quality of the product are effectively ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection molding field especially relates to a double -deck big circle injection mold. BACKGROUND

[0002] Double -deck big circle product is a kind of common injection molding object, and its production process depends on corresponding injection mold. With the increasing demand of market to this kind of product, the performance requirement of double -deck big circle injection mold is increasingly improved. However, the double -deck big circle injection mold currently used has many problems in actual production process, which restricts production efficiency and product quality.

[0003] The working procedure of traditional double -deck big circle injection mold generally includes injection, cooling and demolding etc. Among them, in the demolding link, especially the stage of last ejection product, there is a problem that seriously affects product quality and production efficiency. On the one hand, after the product is completed, the product will generate certain package force with the mold, and when ejecting, the package force will generate force on the product. On the other hand, the product has not completed full cooling before ejection, so that the product is still in a relatively soft state. When the ejection mechanism exerts ejection force on the product, the product will deform due to insufficient strength, resulting in that the shape and size of the final product are difficult to meet the quality requirements, and the product defective rate rises.

[0004] In addition, the lower mold insert structure of double -deck big circle injection mold also has limitations. Due to the structural characteristics of double -deck big circle product itself, the workpiece at the glue position of lower mold insert is usually thin, which leads to that the traditional cooling waterway is difficult to be arranged here. The cooling waterway is an important means for adjusting the cooling speed of product in injection mold, and the heat of mold is taken away through the circulation of cooling liquid, so as to promote the product cooling forming. The lower mold insert lacking of cooling waterway cannot cool the product quickly and effectively, which further aggravates the deformation problem of product when ejection.

[0005] In order to ensure product quality, the existing solution is usually to prolong the production cycle of mold, and to give product enough time to cool in the mold. But this way seriously affects the production efficiency, makes the production cycle longer, reduces the production capacity, and is difficult to meet the rapid delivery demand of market. Therefore, in order to overcome the above problems, a double -deck big circle injection mold is proposed, which can realize rapid cooling when the product is ejected, and further solve the product deformation problem when ejection. SUMMARY

[0006] The utility model discloses to the prior art's deficiency, through the nylon open -and -close ware control parting surface four opening sequence, first open parting surface one makes runner portion and product separate, open parting surface two again and let the front mould insert separate product, reduced the front mould to product's package tight force and product deformation quantity.

[0007] In order to solve the above technical problem, the utility model discloses the following technical scheme to solve the deformation problem of traditional mould when demolding because of product package tight force and insufficient cooling.

[0008] In order to realize the above-mentioned purpose, the utility model adopts the following technical scheme:

[0009] A double-layer big circle injection mold, comprising: front mold structure and rear mold structure, both constitute an integral injection mold for demolding product;

[0010] Lower mould insert, the lower mould insert is composed of head rubber position and iron piece, to cool product fast;

[0011] Rear mold screw structure, it is set between front mold structure and rear mold structure, can make product remain in rear mold structure;

[0012] Parting surface assembly, it is set on front mold structure and rear mold structure, is used to determine the parting position of product demolding.

[0013] Preferably, the parting surface assembly is composed of parting surface one, parting surface two, parting surface three, parting surface four, parting surface five and parting surface six, the parting surface four has nylon open -and -close ware, the parting surface one is runner area, the parting surface two is equipped with front mould insert, the front mould insert realizes separation with product through the opening of parting surface one and parting surface two.

[0014] Preferably, the rear mold screw structure includes a rack, a gear, an oil motor and a threaded core, the rack cooperates with the gear to realize rotation of the threaded core and separation of the product.

[0015] Preferably, the front mold structure is composed of a first plate, a second plate, a third plate and a fourth plate.

[0016] Preferably, the rear mold structure is mainly composed of a fifth plate, a sixth plate, a seventh plate, an eighth plate, a ninth plate, a tenth plate, an eleventh plate and a twelfth plate, the sixth plate is provided with a spring, and the spring is used to pop up the sixth plate upward after the threaded core is separated.

[0017] Preferably, the head rubber position of the lower mould insert adopts beryllium copper material to cool product fast.

[0018] Preferably, the iron part in the lower die insert is made of hard iron to prolong the service life of the lower die insert.

[0019] Compared with the prior art, the utility model has the advantages of the following beneficial effects:

[0020] The double-layer large-circle injection mold provided by the application controls the opening sequence of the parting surface four through the nylon on-off device of the parting surface four, opens the parting surface one first to separate the runner part from the product, and then opens the parting surface two to separate the front mold insert from the product, thereby reducing the clamping force of the front mold on the product and the deformation amount of the product. When the rear mold is demolded, the beryllium copper material of the head rubber position of the lower mold insert can quickly cool the product, thereby enhancing the strength of the product during demolding, reducing the ejection deformation problem caused by incomplete cooling of the product, and effectively ensuring the dimensional accuracy and appearance quality of the product.

[0021] Improve product consistency: the front mold structure and the rear mold structure of the mold can be stably clamped during the injection molding process, and the flatness and precision of each parting surface are high; the mold cavity, the mold core and other molding parts, and the front mold insert and other components are designed reasonably, thereby ensuring that the products molded each time have high consistency in shape and size, and improving the quality stability of the products.

[0022] Demolding is convenient and efficient: the rear mold demolding adopts the transmission mode of oil motor driving rack, gear and threaded rotating core, so that the threaded rotating core and the threaded part of the product are gradually separated, which is more smooth and efficient than the traditional demolding mode. At the same time, the spring provides reset power and space for the six number plates, and each component is quickly reset, thereby reducing the cycle period of the mold and improving the production efficiency.

[0023] Cooling is fast and energy-saving: the beryllium copper material of the head rubber position of the lower mold insert has good heat transfer property, can quickly cool the product, especially the part of the product in contact with the lower mold insert, thereby shortening the cooling time of the product, accelerating the entire injection molding cycle, and improving the production efficiency.

[0024] Reduce the cost of the mold: through the design of the lower mold insert locally embedded with beryllium copper, the material cost is reduced compared with the mold made of special cooling material while ensuring the fast cooling effect. Moreover, the mold structure is reasonably designed, the frequency of mold repair and replacement caused by product deformation and other problems is reduced, and the cost is further saved.

[0025] Prolong the service life of the mold: since the clamping force and friction force of the product on the mold are reduced during demolding, the wear of the mold during mold opening and closing is reduced, the working time of the mold in a high-temperature environment is shortened due to the fast cooling effect, the influence of thermal fatigue on the mold is reduced, and the service life of the mold is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description only constitute some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0027] Figure 1 It is a whole structure schematic view of the present application;

[0028] Figure 2 It is a mold closing state schematic view of the present application;

[0029] Figure 3 It is a front mold structure action schematic view of the present application;

[0030] Figure 4 It is a front mold structure action schematic view of the present application;

[0031] Figure 5 It is a rear mold structure action schematic view of the present application;

[0032] Figure 6 It is a rear mold thread structure schematic view of the present application;

[0033] Figure 7 It is a lower mold insert schematic view of the present application.

[0034] Figure number explanation: 1, front mold structure; 101, front mold insert; 2, rear mold structure; 201, lower mold insert; 2021, head glue position; 2022, iron piece; 3, rear mold thread structure; 301, rack; 302, gear; 303, oil motor; 304, threaded rotating core; 4, product; 5, spring; 6, parting surface assembly; 601, parting surface one; 602, parting surface two; 603, parting surface three; 604, parting surface four; 605, parting surface five; 606, parting surface six; 7, nylon on-off device. DETAILED DESCRIPTION

[0035] The present application will be further described in detail below with reference to the drawings.

[0036] The following description is provided to enable those skilled in the art to practice the present application. The preferred embodiments in the following description are only examples of the present application. Those skilled in the art can think of other obvious modifications in the light of the description. The basic principles defined in the following description can be used in other embodiments, modifications, improvements, equivalent schemes and other technical schemes without departing from the spirit and scope of the present application.

[0037] Those skilled in the art should understand that in the disclosure of the utility model, the orientation or position indicated by the terms "longitudinal", "transverse", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, which is only for the convenience of the simplified description of the utility model and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore the above-mentioned terms cannot be understood as a limitation on the utility model.

[0038] It can be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of one element can be one, and in another embodiment, the number of the element can be multiple, and the term "one" cannot be understood as a limitation on the number. Embodiments

[0039] Please refer to Figures 1-7 A double-layer large-circle injection mold, comprising: a front mold structure 1 and a rear mold structure 2, which constitute an integral injection mold for demolding product 4;

[0040] A lower mold insert 201, which is composed of a head glue position 2021 and an iron piece 2022, is used for rapid cooling of product 4;

[0041] A rear mold threaded structure 3, which is arranged between the front mold structure 1 and the rear mold structure 2, can make the product 4 remain in the rear mold structure 2;

[0042] A parting surface assembly 6, which is arranged on the front mold structure 1 and the rear mold structure 2, is used to determine the parting position of the product 4 demolding.

[0043] The double-layer large-circle injection mold of the present application is mainly composed of a front mold structure 1, a rear mold structure 2, a lower mold insert 201, a head glue position 2021, an iron piece 2022, a rear mold threaded structure 3, a demolding product 4 and a parting surface assembly 6, etc. The following is the detailed structure and working principle.

[0044] I. Mold preparation and installation:

[0045] First, the front mold structure 1 and the rear mold structure 2 of the mold are prepared, the front mold structure 1 is assembled in order by a first plate, a second plate, a third plate and a fourth plate, and the connection between the plates is stable and the position is accurate. The rear mold structure 2 is mainly composed of a fifth plate, a sixth plate, a seventh plate, an eighth plate, a ninth plate, a tenth plate, an eleventh plate and a twelfth plate, which are sequentially assembled, wherein the spring 5 is installed on the sixth plate, and the elasticity and installation firmness of the spring 5 are checked.

[0046] The assembled front mold structure 1 and rear mold structure 2 are installed on the injection molding machine, ensuring that the mold is accurately positioned and firmly connected to the injection molding machine for subsequent injection molding operations.

[0047] The lower mold insert 201 is installed in the corresponding position of the mold, which is composed of a head glue site 2021 and an iron part 2022. The head glue site 2021 is made of beryllium copper, and attention should be paid to ensure the cooperation accuracy of the head glue site 2021 with other parts of the mold during installation, to ensure that it can normally play the role of rapidly cooling the product 4. At the same time, the iron part 2022 is made of hard iron, and the connection strength and stability of the iron part 2022 with other parts of the mold should be ensured.

[0048] The rear mold threaded structure 3 is installed, which includes a rack 301, a gear 302, an oil motor 303, and a threaded rotating core 304. The rack 301, the gear 302, and the threaded rotating core 304 are accurately installed in the rear mold structure 2 according to the design requirements, ensuring the engagement accuracy of the rack 301 and the gear 302, as well as the installation position and rotation flexibility of the threaded rotating core 304. Then the oil motor 303 is installed in the appropriate position of the mold, and the transmission components are connected, ensuring that the oil motor 303 can smoothly drive the rack 301 to move.

[0049] The parting surface assembly 6 is installed, which is composed of parting surface one 601, parting surface two 602, parting surface three 603, parting surface four 604, parting surface five 605, and parting surface six 606, ensuring the flatness and accuracy of each parting surface. The nylon opening and closing device 7 is installed on the parting surface four 604, and the installation firmness and smoothness of the opening and closing action of the nylon opening and closing device 7 should be ensured.

[0050] Injection process:

[0051] Start the injection molding machine, and inject the plastic melt of PP material into the mold cavity. During the injection process, attention should be paid to control the injection pressure, speed, and temperature parameters, to ensure that the plastic melt can uniformly fill the entire cavity and form a double-layer large circle product 4. During the injection process, the front mold structure 1 and the rear mold structure 2 of the mold are in the closed mold state, and the product 4 is formed through the mold cavity, core, and other molding parts, as well as the front mold insert 101 and other components.

[0052] Front mold demolding process:

[0053] After the injection is completed, the mold starts the demolding action. First, since the parting surface four 604 has the nylon opening and closing device 7, the parting surface one 601 is opened first, which is the flow channel area, allowing the flow channel part to separate from the product 4.

[0054] Then open the parting surface two 602, this surface is the upper die insert area, after opening this parting surface, the front die insert 101 will be separated from the product 4, which has two benefits: one is to reduce the product 4 package force of the front die, so that the product 4 is more easily out of the mold; the second is to reduce or eliminate the amount of deformation of the product 4 in the process of product 4 out of the mold, to ensure the quality of the product 4.

[0055] When the parting surface four 604 is completely opened, the front mold structure 1 is completely separated from the product 4.

[0056] The rear mold demolding process:

[0057] After the front mold demolding is completed, the rear mold demolding action begins. The parting surface five 605 is opened, at this time the oil motor 303 starts to work, drives the rack 301 to move, the rack 301 cooperates with the gear 302, and then drives the threaded rotating core 304 to rotate, the threaded rotating core 304 starts to separate from the product 4, until completely separated from the product 4. In this process, due to the beryllium copper material of the head rubber position 2021 of the lower die insert 201 has good heat transfer property, it can quickly cool the product 4, especially the part of the product 4 contacting the lower die insert 201, so that the strength of the product 4 increases when demolding, reducing the ejection deformation problem caused by incomplete cooling of the product 4.

[0058] After the threaded rotating core 304 completely separates from the product 4, the injection molding machine ejector pin ejects, so that the parting surface six 606 is opened, the product 4 is pushed out of the mold by the ejector pin pushing the push plate. At this time, the spring 5 installed on the No. 6 plate will pop the No. 6 plate upwards, providing reset power and space for subsequent actions.

[0059] After the product 4 is pushed out, the robot takes the product 4 out of the mold, completing an injection molding cycle.

[0060] Finally, the oil motor 303 operates again to reset the rack 301, and each component is reset, preparing for the next injection molding.

[0061] II. Working principle:

[0062] Injection molding principle: the injection molding machine injects the molten PP plastic melt into the mold cavity through the gating system, and the plastic melt fills the cavity under the action of pressure in the closed space formed by the closed front mold structure 1 and the rear mold structure 2. After cooling and solidification, the double-layer large circle product 4 is formed. The molding parts of the mold, such as the cavity, the core, the front die insert 101, etc., determine the shape and dimensional accuracy of the product 4.

[0063] The front mold demolding principle: the nylon shutter 7 of the parting surface four 604 controls the opening sequence of the parting surface. First, open the parting surface one 601 to separate the flow channel part from the product 4, then open the parting surface two 602, the front mold insert 101 is separated from the product 4, reducing the clamping force of the front mold on the product 4 and the deformation amount of the product 4, and finally the front mold structure 1 completely separates from the product 4, creating conditions for the back mold demolding.

[0064] The back mold demolding principle: after the parting surface five 605 is opened, the oil motor 303 drives the rack 301 to move, the rack 301 meshes with the gear 302 to drive the threaded rotating core 304 to rotate, so that the threaded rotating core 304 gradually separates from the threaded part of the product 4. The beryllium copper material of the head rubber position 2021 of the lower mold insert 201 quickly cools the product 4, enhances the strength of the product 4, and facilitates demolding. After the threaded rotating core 304 is completely separated, the injection molding machine ejector rod ejects, the parting surface six 606 opens, the push plate pushes out the product 4, the spring 5 pops up the No. 6 plate, the manipulator takes the product, the oil motor 303 operates again to make the rack 301 return to position, the mold closes, and a working cycle is completed. Through this design, the deformation problem caused by insufficient clamping force and cooling of the product 4 during demolding of the traditional mold is solved, and through the design of the lower mold insert 201 with local beryllium copper insert, the cost is reduced while ensuring the effect of rapid cooling, prolonging the service life of the mold and improving the production efficiency.

[0065] The above specific embodiments and working principle detailed description of the operation process and working mechanism of the double-layer large circle injection mold, ensures that the mold can efficiently and stably produce qualified double-layer large circle products 4. In actual application, related parameters can be appropriately adjusted and optimized according to specific production requirements and equipment conditions.

[0066] Those skilled in the art should understand that the embodiments of the utility model shown in the above description and drawings are only as examples and do not limit the utility model. The purpose of the utility model has been completely and effectively realized. The function and structure principle of the utility model have been demonstrated and explained in the embodiments, and the embodiments of the utility model can have any deformation or modification without departing from the principle.

Claims

1. A two-layered large circle injection mold characterized by, The application relates to a two-part injection mould for demoulding a product (4), comprising: a front mould structure (1) and a rear mould structure (2) which form a whole, a lower mould insert (201) which is composed of a head glue position (2021) and an iron part (2022) and is used for rapidly cooling the product (4), a rear mould threaded structure (3) which is arranged between the front mould structure (1) and the rear mould structure (2) and can make the product (4) remain in the rear mould structure (2), and a parting surface assembly (6) which is arranged on the front mould structure (1) and the rear mould structure (2) and is used for determining the parting position of the product (4). The parting surface assembly (6) is composed of a parting surface one (601), a parting surface two (602), a parting surface three (603), a parting surface four (604), a parting surface five (605) and a parting surface six (606), the parting surface four (604) is provided with a nylon shutter (7), the parting surface one (601) is a flow channel area, the front mould insert (101) is arranged in the parting surface two (602), and the front mould insert (101) is separated from the product (4) by opening of the parting surface one (601) and the parting surface two (602). The rear mould threaded structure (3) comprises a rack (301), a gear (302), an oil motor (303) and a threaded rotating core (304), the rack (301) is matched with the gear (302) so as to realize rotation of the threaded rotating core (304) and demoulding of the product (4). The front mould structure (1) is composed of a first plate, a second plate, a third plate and a fourth plate. The rear mould structure (2) is mainly composed of a fifth plate, a sixth plate, a seventh plate, an eighth plate, a ninth plate, a tenth plate, an eleventh plate and a twelfth plate, the sixth plate is provided with a spring (5) which is used for upwardly springing the sixth plate after the threaded rotating core (304) is separated.

2. The mold according to claim 1, wherein: The head glue position (2021) in the lower mould insert (201) is made of beryllium copper material and is used for rapidly cooling the product (4).

3. The mold according to claim 1, wherein: The iron part (2022) in the lower mould insert (201) is made of hard iron and is used for prolonging the service life of the lower mould insert (201).

4. The mold according to claim 1, wherein: ​ 5. The mold of claim 1, wherein: ​ 6. The mold of claim 1, wherein: ​ 7. The mold of claim 1, wherein: ​

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