Exhaust structure of vehicle-mounted lens cone injection mold and design method

Abstract

The invention discloses an exhaust structure of a vehicle-mounted lens cone injection mold and a design method. The exhaust structure comprises a front mold, a rear mold and an inner diameter needle, and the front mold is provided with a mold parting surface; two types of exhaust grooves are designed on the parting surface of the mold, namely, cavity exhaust grooves which are symmetrically distributed and are communicated with an injection molding cavity and the external environment of the mold, and runner exhaust grooves which are symmetrically distributed and are communicated with an injection molding runner and the external environment of the mold; according to a specific inner diameter needle structure of a lens barrel mold, inner diameter needle exhaust grooves which are symmetrically distributed are designed according to the diameter size of an inner diameter needle. According to actual production experience, four empirical formulas are provided to design the sizes and the numbers of the cavity exhaust grooves, the runner exhaust grooves and the inner diameter needle exhaust grooves. The exhaust structure of the vehicle-mounted lens cone injection mold is optimized, a novel exhaust design method of the lens cone injection mold is provided based on the product material and the mold size, gas is exhausted in time in the injection molding process, and the injection molding quality of a vehicle-mounted lens cone product is improved.

Description

Technical Field

[0001] The invention relates to the technical field of injection molds, and in particular to an exhaust structure and a design method of an injection mold for a vehicle-mounted lens barrel. Background Art

[0002] With the rapid development of artificial intelligence, the automotive intelligent advanced driving assistance system (ADAS) with the goal of ultimately achieving fully autonomous driving has also become popular. As a signal input sensor in the automotive intelligent advanced driving assistance system (ADAS), the performance and stability of the vehicle camera directly affect the performance and stability of the entire ADAS. As an optical structural component in the camera, the lens barrel plays a role in establishing geometric space in optical imaging, and the stability of its size directly affects the imaging accuracy and imaging effect. In addition, the vehicle camera needs to work continuously for a long time, and the environment in which it is located is often in a state of large vibration and is greatly affected by extreme weather. The temperature range is about -40℃ to 80℃. At the same time, it is necessary to collect stable data during complex movements, and it needs to meet wide dynamic, medium and low pixels, and wide angle, etc., so high requirements are placed on the lens barrel and other components of the camera.

[0003] When the automotive lens is injection molded, defects such as scorching and gas marks will appear on the local surface near the parting surface and the inner side of the lens barrel. This is because the gas generated by the thermal decomposition of the plastic raw material in the mold cavity cannot be discharged from the injection mold in time during the injection process to fill the mold cavity. If the gas in the mold cavity cannot be discharged for a long time, it will directly cause injection defects such as material shortage, scorching, gas marks, and surface fogging, and indirectly cause injection defects such as shrinkage marks and exposed glass fibers. Summary of the invention

[0004] In order to solve the problem of product defects caused by poor mold exhaust during the injection molding of vehicle-mounted lens barrels, the purpose of the present invention is to provide an exhaust structure and design method for the injection molding mold of a vehicle-mounted lens barrel, by reasonably opening the mold exhaust, the gas can be discharged in time during the injection molding process, thereby achieving injection molding of precision vehicle-mounted lens barrel products.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] An exhaust structure of a vehicle-mounted lens barrel injection mold comprises a front mold, a rear mold, a first inner diameter needle and a second inner diameter needle, wherein the front mold is provided with a mold parting surface;

[0007] The mold parting surface is provided with symmetrically arranged mold cavities and mold runners connected to the mold cavities; the mold parting surface is provided with a mold injection gate, and the mold injection gate is used to connect the mold runner; the mold parting surface is provided with a third exhaust groove, and the third exhaust groove is used to connect the mold cavity with the external environment; the mold parting surface is provided with a fourth exhaust groove, and the fourth exhaust groove is used to connect the mold runner with the external environment;

[0008] The first inner diameter needle is embedded in the front mold, and the second inner diameter needle is embedded in the rear mold; the first inner diameter needle and the second inner diameter needle are separated by a truncated cone.

[0009] Furthermore, the third exhaust grooves are arranged symmetrically and are divided into two holes, each hole including 6 exhaust grooves.

[0010] Furthermore, the fourth exhaust grooves are arranged symmetrically and include 30 exhaust grooves.

[0011] Furthermore, the first inner diameter needle is provided with a first exhaust groove, and the second inner diameter needle is provided with a second exhaust groove.

[0012] Furthermore, the first exhaust grooves are symmetrically arranged and include 6 exhaust grooves; the second exhaust grooves are symmetrically arranged and include 12 exhaust grooves.

[0013] The present invention also provides a method for designing an exhaust structure of a vehicle-mounted lens barrel injection mold, comprising the following steps:

[0014] Determine the material of the lens barrel, and obtain the overflow value C of the material by consulting the standard. The overflow value C of the material indicates the gap value (i.e., burr) of the material that will overflow during the molding process of the plastic part;

[0015] Calculate the size S1 of the third exhaust groove at the mold parting surface. Since the mold cavity must ensure the product molding accuracy, the size of the third exhaust groove should be as small as possible while ensuring that the gas can be discharged smoothly. The calculation empirical formula 1 of the third exhaust groove is as follows:

[0016]

[0017] Calculate the size S2 of the fourth exhaust groove at the mold parting surface. Since the material in the runner is in a molten state and the temperature is high, it is easy to generate gas accumulation. Therefore, the size of the fourth exhaust groove is larger than that of the third exhaust groove. The calculation empirical formula 2 of the fourth exhaust groove is as follows:

[0018]

[0019] Design the exhaust structure at the inner diameter needle of the lens barrel, including the calculation of exhaust size and exhaust number;

[0020] The empirical formula 3 for the inner diameter needle exhaust size S3 is as follows:

[0021]

[0022] The number of exhausts n of the inner diameter needle is related to the diameter D of the inner diameter needle structure; the diameter D of the inner diameter needle is determined according to the mold structure, and the empirical formula 4 for calculating the number of exhausts n is as follows:

[0023]

[0024] Compared with the prior art, the present invention has the following advantages: the present invention adopts a symmetrical exhaust groove structure, optimizes the exhaust system of the mold, and designs a corresponding exhaust structure for the inner diameter needle structure unique to the vehicle-mounted lens barrel, and proposes an exhaust design method for the vehicle-mounted lens barrel injection mold to avoid the inability to effectively exhaust the gas in the injection chamber and the inner diameter needle of the mold, which affects the product molding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described below are merely exemplary. A person skilled in the art can derive other implementation drawings based on the provided drawings without inventive effort.

[0026] Figure 1 It is a schematic diagram of the front template structure of a vehicle-mounted lens barrel injection mold of the present invention;

[0027] Figure 2 It is a schematic diagram of the rear template structure of a vehicle-mounted lens barrel injection mold of the present invention;

[0028] Figure 3 It is a schematic diagram of the parting surface structure of a vehicle-mounted lens barrel injection mold of the present invention;

[0029] Figure 4 It is a schematic diagram of a unique inner diameter needle structure of a vehicle-mounted lens barrel injection mold of the present invention;

[0030] Figure 5 It is a flow chart of a vehicle-mounted lens barrel injection mold exhaust design method of the present invention;

[0031] In the figure: 1-front mold; 2-back mold; 3-mold parting surface; 4-mold cavity; 5-mold runner; 6-mold injection gate; 7-third venting groove; 8-fourth venting groove; 9-first inner diameter needle; 10-second inner diameter needle; 11-first venting groove; 12-second venting groove. DETAILED DESCRIPTION

[0032] The following is an explanation of the implementation mode of the present invention by means of specific embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0033] like Figure 1-Figure 4 As shown, an exhaust structure of a vehicle-mounted lens barrel injection mold includes a front mold 1, a rear mold 2, a first inner diameter needle 9 and a second inner diameter needle 10, and a mold parting surface 3 is provided on the front mold 1.

[0034] The mold parting surface 3 is provided with symmetrically arranged mold cavities 4 and a mold runner 5 connected to the mold cavity 4; the mold parting surface 3 is provided with a mold injection gate 6, and the mold injection gate 6 is used to connect the mold runner 5; the mold parting surface 3 is provided with a third exhaust groove 7, and the third exhaust groove 7 is used to connect the mold cavity 4 with the external environment, and the third exhaust groove 7 is symmetrically arranged and divided into two holes, each hole includes 6 exhaust grooves; the mold parting surface 3 is provided with a fourth exhaust groove 8, and the fourth exhaust groove 8 is used to connect the mold runner 5 with the external environment, and the fourth exhaust groove 8 is symmetrically arranged and includes 30 exhaust grooves.

[0035] The first inner diameter needle 9 is embedded in the front mold 1, and the second inner diameter needle 10 is embedded in the rear mold 2; the first inner diameter needle 9 and the second inner diameter needle 10 are separated by a truncated cone.

[0036] The first inner diameter needle 9 is provided with a first exhaust groove 11, and the second inner diameter needle 10 is provided with a second exhaust groove 12; the first exhaust grooves 11 are symmetrically arranged and include 6 exhaust grooves; the second exhaust grooves 12 are symmetrically arranged and include 12 exhaust grooves.

[0037] like Figure 5 As shown, a design method for an exhaust structure of a vehicle-mounted lens barrel injection mold comprises the following steps:

[0038] Step 1, determining the material of the lens barrel, and obtaining the overflow value C of the material by consulting the standard, wherein the overflow value C of the material indicates the gap value size of the material overflowing during the molding process of the plastic part;

[0039] Step 2, calculate the size S1 of the third exhaust groove 7 at the mold parting surface 3. Since the mold cavity 4 needs to ensure the product molding accuracy, the size of the third exhaust groove 7 should be as small as possible under the premise of ensuring that the gas can be discharged smoothly; the calculation empirical formula 1 of the third exhaust groove 7 is as follows:

[0040]

[0041] Step 3, calculate the size S2 of the fourth exhaust groove 8 at the mold parting surface 3. Since the material in the flow channel is in a molten state and the temperature is high, it is easy to generate gas accumulation, so the size of the fourth exhaust groove 8 is larger than that of the third exhaust groove 7; the calculation empirical formula 2 of the fourth exhaust groove 8 is as follows:

[0042]

[0043] Step 4, designing the exhaust structure at the inner diameter needle of the lens barrel, including calculation of exhaust size and exhaust number;

[0044] The empirical formula 3 for the inner diameter needle exhaust size S3 is as follows:

[0045]

[0046] The number of exhausts n of the inner diameter needle is related to the diameter D of the inner diameter needle structure; the diameter D of the inner diameter needle is determined according to the mold structure, and the empirical formula 4 for calculating the number of exhausts n is as follows:

[0047]

[0048] The present design method is specifically described below through examples.

[0049] Embodiment 1

[0050] 1. Determine that the lens barrel material is PPS1141L4, and by consulting the standard, determine that its overflow value is 0.02mm.

[0051] 2. Calculate the size S1 of the cavity venting groove at the parting surface. According to the empirical formula 1, the size of the cavity venting groove at the parting surface is calculated as:

[0052]

[0053] 3. Calculate the size of the runner vent groove S2 at the parting surface. According to the empirical formula 2, the size of the runner vent groove at the parting surface is calculated as:

[0054]

[0055] 4. Design the exhaust structure of the inner diameter needle structure that is unique to the lens barrel mold, and calculate the exhaust size of the inner diameter needle according to the empirical formula 3:

[0056]

[0057] According to the mold structure, the inner diameter of the front mold needle diameter D1 is 7.2mm, and the inner diameter of the rear mold needle diameter is 8.4mm.

[0058] Formula 4 calculates the number of exhaust pins in the front mold inner diameter as:

[0059]

[0060] According to the empirical formula 4, the number of exhausts of the thick film 2 inner diameter needle is calculated as:

[0061]

[0062] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. An exhaust structure of a vehicle-mounted lens barrel injection mold, characterized in that: It comprises a front mold (1), a rear mold (2), a first inner diameter needle (9) and a second inner diameter needle (10), wherein the front mold (1) is provided with a mold parting surface (3); The mold parting surface (3) is provided with symmetrically arranged mold cavities (4) and a mold flow channel (5) connected to the mold cavities (4); the mold parting surface (3) is provided with a mold injection gate (6), and the mold injection gate (6) is used to connect to the mold flow channel (5); the mold parting surface (3) is provided with a third exhaust groove (7), and the third exhaust groove (7) is used to connect the mold cavity (4) with the external environment; the mold parting surface (3) is provided with a fourth exhaust groove (8), and the fourth exhaust groove (8) is used to connect the mold flow channel (5) with the external environment; The first inner diameter needle (9) is embedded in the front mold (1), and the second inner diameter needle (10) is embedded in the rear mold (2); the first inner diameter needle (9) and the second inner diameter needle (10) are separated by a truncated cone.

2. The exhaust structure of the vehicle-mounted lens barrel injection mold according to claim 1, characterized in that: The third exhaust grooves (7) are symmetrically arranged and divided into two holes, each hole comprising 6 exhaust grooves.

3. The exhaust structure of the vehicle-mounted lens barrel injection mold according to claim 1, characterized in that: The fourth exhaust grooves (8) are symmetrically arranged and include 30 exhaust grooves.

4. The exhaust structure of the vehicle-mounted lens barrel injection mold according to claim 1, characterized in that: The first inner diameter needle (9) is provided with a first exhaust groove (11), and the second inner diameter needle (10) is provided with a second exhaust groove (12).

5. The exhaust structure of the vehicle-mounted lens barrel injection mold according to claim 4, characterized in that: The first exhaust grooves (11) are symmetrically arranged and include 6 exhaust grooves; the second exhaust grooves (12) are symmetrically arranged and include 12 exhaust grooves.

6. A method for designing an exhaust structure of a vehicle-mounted lens barrel injection mold, characterized in that: The steps include: Determine the material of the lens barrel, and obtain the overflow value C of the material by consulting the standard. The overflow value C of the material indicates the gap value size of the material overflowing during the plastic part molding process; The size S1 of the third exhaust groove (7) at the mold parting surface (3) is calculated. Since the mold cavity (4) needs to ensure the product molding accuracy, the size of the third exhaust groove (7) should be as small as possible while ensuring that the gas can be discharged smoothly. The calculation empirical formula 1 of the third exhaust groove (7) is as follows: The size S2 of the fourth exhaust groove (8) at the mold parting surface (3) is calculated. Since the material in the flow channel is in a molten state and the temperature is high, it is easy to generate gas accumulation. Therefore, the size of the fourth exhaust groove (8) is larger than that of the third exhaust groove (7). The calculation empirical formula 2 of the fourth exhaust groove (8) is as follows: Design the exhaust structure at the inner diameter needle of the lens barrel, including the calculation of exhaust size and exhaust number; The empirical formula 3 for the inner diameter needle exhaust size S3 is as follows: The number of exhausts n of the inner diameter needle is related to the diameter D of the inner diameter needle structure; the diameter D of the inner diameter needle is determined according to the mold structure, and the empirical formula 4 for calculating the number of exhausts n is as follows:

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