Injection molding glue injection structure and injection mold

Abstract

The utility model discloses an injection molding glue injection structure and an injection mold, the injection molding glue injection structure comprises a pouring gate communicated with a cavity of the injection mold and a runner communicated with the pouring gate, the runner is communicated with a pressure dividing well, and the length of the pressure dividing well is more than ten times of the thickness of a glue inlet position of the cavity. The pressure dividing well structure is designed at the tail end of the runner, so that the pressure at the sprue is reduced, the speed at the sprue is divided, the surface speed of a product is reduced, and sprue lines are prevented from being generated on the surface of an injection product. By means of the sheet-shaped pouring gate rubber feeding structure, sudden change of the shearing rate of rubber in the whole runner structure is reduced, pouring gate lines on the surface of a product are avoided, the pressure and rate of molten rubber of a main runner can be divided by the pressure dividing well, the pressure and rate of the molten rubber flowing into the sub-runners are reduced, and the pouring gate lines on the surface of the product are avoided. The flow velocity can be effectively ensured to be adjusted from a disordered state to a stable state, so that a product is filled at a stable flow velocity, and gate defects are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding, in particular to an injection molding glue injection structure and an injection mold. Background Art

[0002] The side panel of the air conditioner is an important exterior part of the air conditioner, so its appearance is very important. The side panel of the air conditioner needs to be molded by mold injection, but the conventional method of injecting glue will cause gate lines on the surface of the product, which greatly affects the appearance. Therefore, it is necessary to develop a glue injection structure to solve the gate lines on the side panel and solve the problem of gate lines on the surface of the product. Utility Model Content

[0003] In order to solve the problem of gate lines on the surface of injection molded products, the utility model proposes an injection molding glue injection structure and an injection mold. By designing a pressure well structure at the end of the runner, the pressure at the gate position is reduced, the speed at the gate position is diverted, the surface speed of the product is reduced, and the gate lines on the surface of the injection molded product are avoided.

[0004] The technical solution adopted by the utility model is to design an injection molding glue injection structure, including a gate connected to the injection mold cavity and a flow channel connected to the gate, the flow channel is connected to a pressure dividing well, and the length of the pressure dividing well is greater than ten times the thickness of the glue injection position of the cavity.

[0005] In certain embodiments, the length of the partial pressure well is ten times the thickness of the cavity at the injection position plus 3 to 5 mm.

[0006] In some embodiments, the cross-sections of the flow channel and the pressure-dividing well are both trapezoidal, and the height of the trapezoidal cross-section of the pressure-dividing well is H. 分压井 , the length of the lower base of the trapezoid is W 分压井 , the length of the upper base of the trapezoid is D 分压井 ; The trapezoidal height of the flow channel cross section is H 流道 , the length of the lower base of the trapezoid is W 流道 , the length of the upper base of the trapezoid is D 流道 ; 0.5W 流道 ≤W 分压井 ≤0.67W 流道 , 0.5D 流道 ≤D 分压井 ≤0.67D 流道 、0.5H 流道 ≤H 分压井 ≤0.67H 流道 .

[0007] In certain embodiments, the gate is a laminar gate.

[0008] In some embodiments, the gate width is not less than 0.8 times the thickness of the cavity at the injection position.

[0009] In certain embodiments, the gate width is not greater than the thickness of the cavity at the injection position.

[0010] In certain embodiments, the gate extends vertically upward from the bottom to the cavity.

[0011] In some embodiments, the runner is connected to the gate through a necking.

[0012] In some embodiments, the length direction of the pressure dividing well is perpendicular to the flow channel.

[0013] The injection mold comprises the injection molding glue injection structure.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] The utility model designs a pressure-dividing well structure at the end of the runner to reduce the pressure at the gate position, shunt the rate at the gate position, reduce the surface rate of the product, and avoid the generation of gate lines on the surface of the injection molded product. The lamellar gate injection structure is used to reduce the shear rate mutation of the rubber in the entire runner structure, solve the problem of gate lines on the product surface, and the pressure-dividing well will shunt the pressure and rate of the molten rubber in the main channel, reduce the pressure and rate of the flow into the shunt channel, and finally the molten rubber enters the cavity through the gate, completing the injection molding process of the entire product. The gate is a lamellar gate, which reduces the shear rate mutation of the rubber in the entire runner structure, solves the problem of gate lines on the product surface, and can effectively ensure that the flow rate is adjusted from a turbulent state to a stable state, so as to fill the product at a stable flow rate, thereby not causing gate defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is described in detail below in conjunction with specific embodiments and drawings. In order to show details and facilitate understanding of its principles, it is not necessarily drawn to scale, and similar reference numerals may describe similar components in different views. The drawings generally illustrate the embodiments discussed herein by way of example and not limitation. Among them:

[0017] Figure 1 It is a schematic diagram of the air conditioner side panel product.

[0018] Figure 2 It is a schematic diagram of the glue injection structure used in the prior art when injecting the side panel of the air conditioner.

[0019] Figure 3 It is a three-dimensional schematic diagram of the glue injection structure of this embodiment.

[0020] Figure 4 It is a top view schematic diagram of the injection structure.

[0021] Figure 5 yes Figure 4 An enlarged schematic diagram of point B.

[0022] Figure 6 yes Figure 4 Schematic diagram of the AA section.

[0023] Figure 7 yes Figure 6 An enlarged schematic diagram of point C.

[0024] Figure 8 It is a top view schematic diagram of the air conditioner side panel product.

[0025] Fig. 9 yes Figure 8 Schematic diagram of DD cross section.

[0026] In the figure, 1, air conditioning side panel; 3, gate; 4, pressure well; 5, main channel; 6, branch channel; 61, shrinkage. DETAILED DESCRIPTION

[0027] The following are specific embodiments of the present invention, and the technical solution of the present invention is further described in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments, and the following embodiments do not limit the utility model involved in the claims. In addition, all combinations of the features described in the embodiments are not necessarily required for the solution of the utility model.

[0028] The principle and structure of the present utility model are described in detail below with reference to the accompanying drawings and embodiments.

[0029] Example

[0030] like Figure 1 , 2 As shown in 3, it is the side panel 1 of the air conditioner. The side panel of the air conditioner is an important appearance part of the air conditioner, so its appearance is very important. The side panel of the air conditioner needs to be molded by injection molding, such as Figure 4 As shown, the injection structure used in the prior art for injection molding of air conditioner side panels includes a runner, a gate, and a cavity for injection molding air conditioner side products. However, this injection structure easily causes turbulence in the molten glue flow rate at the gate, which can cause gate lines on the product surface.

[0031] Therefore, in order to solve the above problems, Figure 5 , 6 , 7, 8, and 9, a glue injection structure for injection molding of an air conditioner side panel is proposed, wherein the glue injection structure comprises a gate 3 connected to the injection mold cavity and a flow channel connected to the gate, wherein the flow channel is connected to a pressure dividing well 4, and the pressure dividing well has a length L 分压井 Greater than the thickness H of the cavity injection position 料厚ten times of the pressure difference to ensure sufficient pressure difference. A pressure difference well structure is designed at the end of the runner to reduce the pressure at the gate, divide the speed at the gate, reduce the speed on the product surface, and solve the gate pattern on the product surface. The cavity is the external corresponding to the air conditioner side panel in the figure.

[0032] The length of the pressure well is 10 times the thickness of the cavity injection position plus 3-5mm. 10 times the thickness of the product material plus 3-5mm safety value L pressure well = 10*H 料厚 +(3~5)mm, the thickness of the side plate of the air conditioner in this embodiment is 2.5mm, so the design length of the pressure divider well is at least greater than 25mm.

[0033] The cross-sections of the flow channel and the pressure dividing well are both trapezoidal, and the height of the trapezoidal cross-section of the pressure dividing well is H. 分压井 , the length of the lower base of the trapezoid is W 分压井 , the length of the upper base of the trapezoid is D 分压井 ; The trapezoidal height of the flow channel cross section is H 流道 , the length of the lower base of the trapezoid is W 流道 , the length of the upper base of the trapezoid is D 流道 ; 0.5W 流道 ≤W 分压井 ≤0.67W 流道 , 0.5D 流道 ≤D 分压井 ≤0.67D 流道 、0.5H 流道 ≤H 分压井 ≤0.67H 流道 .

[0034] The design length of the trapezoidal pressure-dividing well is at least greater than 25 mm, and in this embodiment, it is L 分压井 =30mm, the other three dimensions of the pressure well are: W 分压井 =4mm, D 分压井 =3mm, H 分压井 =3mm.

[0035] The cold well has three sizes H 分压井、 W 分压井、 D 分压井 Related to the flow channel size; the size of this trapezoidal flow channel is W 流道 =8mm, D 流道 =6mm, H 流道 =6mm. Therefore, the design length of the pressure-dividing well is at least greater than or equal to 25mm; the pressure-dividing well W 分压井、 D 分压井、 H 分压井 The three parameter designs are related to the flow channel size, and their relationship is 0.5W 流道 ≤W 分压井 ≤0.67W 流道 , 0.5D流道 ≤D 分压井 ≤0.67D 流道 、0.5H 流道 ≤H 分压井 ≤0.67H 流道 .

[0036] The flow channel includes a main flow channel 5 and a branch flow channel 6. The main flow channel is connected to the branch flow channel, the pressure-dividing well is connected to the branch flow channel, and the branch flow channel is connected to the gate. When the molten rubber passes through the main flow channel, the branch flow channel and the pressure-dividing well are connected to the main flow channel at the same time. The pressure-dividing well will divert the pressure and rate of the molten rubber in the main flow channel, reduce the pressure and rate of the molten rubber flowing into the branch flow channel, and finally the molten rubber enters the cavity through the gate, completing the injection molding process of the entire product.

[0037] The runner is connected to the gate through the necking 61 so as to stabilize the injection speed.

[0038] The length direction of the pressure dividing well is perpendicular to the flow channel to facilitate rapid pressure division.

[0039] The gate is a lamellar gate, which reduces the sudden change in shear rate of the rubber material in the entire runner structure and solves the gate pattern on the product surface.

[0040] When the molten rubber flows into the gate through the branch channel, a sudden change occurs at the junction, causing flow disorder. However, when passing through the sheet gate, due to its unique design structure, the flow rate can be effectively adjusted from a disordered state to a stable state, thereby filling the product with a stable flow rate, thus avoiding gate defects.

[0041] The gate width W 浇口 The gate width is not less than 0.8 times the thickness H of the cavity injection position to ensure the stability of the injection. The gate width is not greater than the thickness of the cavity injection position. The gate length L 浇口 The gate width W is designed to be at least 15 mm. In this embodiment, the gate width W is designed to be 15 mm. 浇口 =1.6mm, this width W 浇口 It is related to the material thickness at the product's glue feeding position. The relationship is as follows:

[0042] 0.8H≤W 片状进胶 ≤H (H is the product thickness at the injection position, i.e. the cavity thickness).

[0043] The product thickness at the injection position of this embodiment is H = 2.0 mm, so the gate width W 片状进胶 Designed to be 1.6mm.

[0044] The gate is arranged vertically from bottom to top of the cavity, which is conducive to the upward discharge of gas from the molten rubber.

[0045] Through the simulation of moldflow software, when the shear rate value of the product surface is greater than 1000S-1, the product position and the gate pattern defects are generated. Through comparison in moldflow software, using this embodiment, the shear rate of the product surface is much less than 1000S-1. -1 ,Through mold trial verification, the air-conditioning side panel parts using a new glue injection method have no gate marks on the surface of the parts, which meets the quality appearance requirements.

[0046] The injection mold comprises the injection molding glue injection structure.

[0047] Injection molding is a common plastic processing technology, which is usually used to produce various plastic products. This process injects heated molten plastic into the mold, cools and solidifies in the mold, and finally forms the desired product shape. The injection mold is the key tool for injection molding, which determines the shape, size and quality of the final product.

[0048] The injection mold cavity is the part of the injection mold used to form the product outline. Each product outline has a corresponding cavity. Injection molds are usually composed of a fixed mold (injection mold) and a movable mold (movable mold), and the cavity is located in the fixed mold. The design of the cavity depends on the shape and size of the final product. During the injection molding process, the molten plastic is injected into the cavity through a nozzle to fill the entire product outline. The design of the cavity must take into account factors such as the plastic flow path, filling conditions, and cooling effects to ensure the quality of the final product. The design of the injection mold cavity usually takes into account factors such as the structural characteristics of the product, material properties, and injection molding process parameters. Through precise design and processing, it can be ensured that the cavity has good filling performance, surface quality, and dimensional accuracy, thereby producing high-quality plastic products.

[0049] The gate is the part of the injection mold used to inject molten plastic into the mold cavity. It is the starting point for the formation of plastic products and directly affects the appearance and quality of the product.

[0050] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described, or replace them in similar ways, without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

[0051] Although some terms are used more frequently in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model. The execution order of actions, steps, etc. in the devices and methods shown in the specification and the drawings can be implemented in any order as long as there is no special explicit limitation on the order and the output of the previous processing is not used in the subsequent processing. Similar sequential terms (for example, "first", "next", "secondly", "again", "then", etc.) used for the convenience of description do not mean that they must be implemented in such an order.

[0052] Those skilled in the art should understand that all directional references (for example, above, below, upward, up, downward, down, top, bottom, left, right, vertical, horizontal, etc.) are used descriptively in the drawings to facilitate the reader's understanding, and do not represent limitations (for example, on position, orientation or use, etc.) on the scope of the present invention as defined by the appended claims. They are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the referred device or element must have a specific orientation or be constructed and operated in a specific orientation. The directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0053] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0054] In addition, some vague terms (e.g., substantially, certain, generally, etc.) may refer to slight inaccuracies or slight deviations of conditions, quantities, values, or dimensions, some of which are within the manufacturing deviation or tolerance range. It should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meanings and therefore cannot be understood as limiting the scope of protection of this application.

Claims

1. An injection molding glue injection structure, comprising a gate connected to an injection mold cavity and a runner connected to the gate, characterized in that: The flow channel is connected with a pressure-dividing well, and the length of the pressure-dividing well is greater than ten times the thickness of the cavity at the injection molding position; the gate width is not greater than the thickness of the cavity at the injection molding position.

2. The injection molding glue injection structure according to claim 1, characterized in that: The length of the pressure-dividing well is ten times the thickness of the cavity at the injection position plus 3-5 mm.

3. The injection molding glue injection structure according to claim 1, characterized in that: The cross-sections of the flow channel and the pressure-dividing well are both trapezoidal, the trapezoidal height of the pressure-dividing well cross-section is H pressure-dividing well, the length of the lower bottom of the trapezoid is W pressure-dividing well, and the length of the upper bottom of the trapezoid is D pressure-dividing well; the trapezoidal height of the flow channel cross-section is H flow channel, the length of the lower bottom of the trapezoid is W flow channel, and the length of the upper bottom of the trapezoid is D flow channel; 0.5W flow channel ≤ W pressure-dividing well ≤ 0.67 W flow channel, 0.5D flow channel ≤ D pressure-dividing well ≤ 0.67D flow channel, 0.5H flow channel ≤ H pressure-dividing well ≤ 0.67H flow channel.

4. The injection molding glue injection structure according to claim 1, characterized in that: The gate is a lamellar gate.

5. The injection molding glue injection structure according to claim 4, characterized in that: The gate width is not less than 0.8 times the thickness of the cavity at the injection position.

6. The injection molding glue injection structure according to claim 4, characterized in that: The gate is perpendicular to the cavity from bottom to top.

7. The injection molding glue injection structure according to claim 1, characterized in that: The runner is communicated with the gate through a constriction.

8. The injection molding glue injection structure according to claim 1, characterized in that: The length direction of the pressure dividing well is perpendicular to the flow channel.

9. An injection mold, characterized in that: It comprises the injection molding glue injection structure as described in any one of claims 1 to 8.

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