Injection molding assembly and injection molding system

Abstract

The utility model relates to injection molding system technical field, concretely relates to a kind of injection molding assembly and injection molding system, wherein injection molding assembly includes threaded insert, the outside wall of threaded insert is provided with external thread, and external thread extends to at least one end of threaded insert;At least one end of threaded insert is provided with first cutout, and the tail tooth of external thread is cut off by first cutout;The end portion of threaded insert provided with first cutout is connected with auxiliary shaft, and the end of auxiliary shaft close to threaded insert is provided with boss, and boss and first cutout concave-convex cooperation are matched.The utility model can overcome the technical problem that the end portion of existing threaded insert is prone to damage during injection molding processing, leading to the decrease of injection molding part yield, the increase of production cost, and the formation of tail tooth boss.

Description

Technical Field

[0001] This utility model relates to the field of injection molding system technology, and in particular to an injection molding component and an injection molding system. Background Technology

[0002] Injection molded parts are components produced through injection molding. To achieve threaded connections, many injection molded parts include internal thread features. When processing these injection molded parts, threaded inserts need to be installed in the injection molding system. Threaded inserts are generally shaft-shaped components with external threads on their outer walls that match the internal threads. Injection molding is then performed, and the threaded inserts are removed after injection molding, leaving the internal thread feature at the corresponding position on the injection molded part.

[0003] However, due to the geometric characteristics of the thread, when the end of the internal thread approaches the end face of the inner hole of the injection molded part, the tooth profile of the internal thread will gradually become shallower until it disappears completely. In order to match this characteristic of the internal thread, the external thread feature at the end of the thread insert needs to be machined to be extremely thin (theoretically, the thickness will gradually decrease to zero), which makes it very easy to cause defects and lead to problems such as a decrease in the yield of injection molded parts and an increase in production costs. Furthermore, since the thickness of the external thread feature of the thread insert cannot be reduced to zero according to the theoretical value during actual processing, the thread insert will also form a tail tooth boss that does not conform to the design at the corresponding position of the injection molded part. For injection molded parts that require high-speed movement (such as magnetic rotors), the tail tooth boss will cause problems such as vibration, abnormal noise, and unstable output power of the injection molded part. Therefore, it is urgent to improve the injection molded components. Utility Model Content

[0004] The purpose of this invention is to overcome the technical problems that existing threaded inserts are prone to defects at the end during injection molding, leading to a decrease in the yield of injection molded parts, an increase in production costs, and the formation of a tail tooth boss, and to provide an injection molding component and injection molding system.

[0005] In a first aspect, the present invention provides an injection molding component, including a threaded insert, wherein an external thread is provided on the outer side wall of the threaded insert and the external thread extends to at least one end of the threaded insert; at least one end of the threaded insert is provided with a first cut, the first cut removing the tail tooth of the external thread; an auxiliary shaft is connected to the end of the threaded insert provided with the first cut, and a boss is provided at one end of the auxiliary shaft near the threaded insert, the boss engaging with the first cut.

[0006] Preferably, the auxiliary shaft is detachably connected to the threaded insert.

[0007] Preferably, a positioning shaft is provided at the end of the threaded insert near the auxiliary shaft, and a positioning hole is provided at the end of the auxiliary shaft near the threaded insert. The positioning hole matches the cross-sectional shape of the positioning shaft, and the positioning shaft is inserted into the positioning hole.

[0008] Preferably, the cross-sectional shape of the positioning shaft is one of polygonal, single-flat, double-flat, or gear-shaped.

[0009] Preferably, the end of the locating shaft away from the threaded insert is chamfered, and / or the opening of the locating hole is chamfered.

[0010] Preferably, the two ends of the external thread extend to the two ends of the threaded insert, and each end of the threaded insert is provided with a first cut and connected to a corresponding auxiliary shaft.

[0011] In a second aspect, the present invention provides an injection molding system, including a gating system, and also includes an injection molding component of the present invention.

[0012] Preferably, it also includes a magnetic ring, which is sleeved on the outside of the injection molding assembly.

[0013] Preferably, the thickness of the middle part of the magnetic ring is greater than the thickness of the ends of the magnetic ring.

[0014] Preferably, the magnetic ring includes a constant thickness section and a variable thickness section. The thickness of the constant thickness section remains constant along the length direction of the magnetic ring, and both ends of the constant thickness section are connected to the variable thickness section. The outer diameter of the variable thickness section matches that of the constant thickness section, and the inner diameter of the variable thickness section is larger than that of the constant thickness section. The inner diameter of the variable thickness section is larger the further away from the constant thickness section it is.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] 1. This utility model provides an injection molding component. By setting a first notch at the end of the threaded insert, the tail tooth with insufficient thickness at the end of the external thread can be eliminated. This reduces the risk of end defects in the threaded insert, thereby improving the yield rate of injection molded parts and reducing production costs. It also avoids the formation of tail tooth bosses in injection molded parts due to tail teeth, thus preventing problems such as vibration, abnormal noise, and unstable output power in injection molded parts that require high-speed movement. The boss on the auxiliary shaft can seal the first notch through its concave-convex fit with the first notch, preventing injection molded parts from failing due to missing tail teeth.

[0017] 2. This utility model provides an injection molding system. By using the injection molding components of this utility model, the yield rate of injection molded parts can be improved and the appearance of tail tooth protrusions on the injection molded parts can be prevented. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of a threaded insert in the prior art; Figure 2 This is a three-dimensional structural schematic diagram of a threaded insert for an injection-molded component according to the present invention; Figure 3 This is a side view of the threaded insert of an injection-molded component according to the present invention. Figure 4 This is a three-dimensional structural diagram of an auxiliary shaft for an injection molding component according to the present invention; Figure 5 This is a side view of an injection molding component according to the present invention. Figure 6 This is a partially enlarged side sectional view of an injection molding component according to this utility model; Figure 7 This is a side sectional view of an injection molding system according to the present invention. Figure 1 ; Figure 8 This is a side sectional view of an injection molding system according to the present invention. Figure 2 ; Figure 9 This is a side sectional view of an injection molding system according to the present invention. Figure 3 ; Figure 10 yes Figure 8 A magnified view of a portion of point A in the middle; icon: 100 - Threaded insert; 110 - External thread; 111 - Tail tooth; 120 - First cut; 130 - Positioning shaft; 200 - Auxiliary shaft; 210 - Boss; 220 - Positioning hole; 300 - Magnetic ring; 310 - Constant thickness section; 320 - Variable thickness section; 400 - Injection molded parts. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0020] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0021] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0022] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0023] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0024] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0025] Example 1 like Figures 1 to 6 As shown, an injection-molded assembly includes a threaded insert 100 and an auxiliary shaft 200.

[0026] The threaded insert 100 is a shaft-shaped member. An external thread 110 is provided on the outer wall of the threaded insert 100, extending to at least one end of the threaded insert 100. Correspondingly, a first cut 120 is provided at least one end of the threaded insert 100, which removes the tail tooth 111 of the external thread 110; for example... Figure 1As shown, the external thread 110 extends to the right end of the thread insert 100 and forms a tail tooth 111 (i.e., the thickness T of the external thread 110 gradually decreases to 0 in a transitional region), thus allowing it to be... Figure 2 As shown, a first notch 120 is machined at the right end of the threaded insert 100 to remove the tail tooth 111; and depending on the position of the external thread 110 and the processing requirements of the injection molded part 400, it can be done as follows: Figure 7 and Figure 8 As shown, the first notch 120 is provided only at one end of the threaded insert 100 (even if the external thread 110 extends to both ends of the threaded insert 100 simultaneously), it can also be as follows: Figure 9 As shown, a first cut 120 is provided at both ends of the threaded insert 100. The first cut 120 can be a flat cut, a bevel cut, an arc cut, or an irregular cut, as long as it can remove the tail tooth 111.

[0027] The threaded insert 100 has an auxiliary shaft 200 connected to the end with the first notch 120. A boss 210 is provided at the end of the auxiliary shaft 200 near the threaded insert 100. The boss 210 and the first notch 120 are in a concave-convex fit, meaning the shape and size of the boss 210 match the first notch 120. For example, if the first notch 120 is like... Figure 2 As shown, a flat cut can make the cross-section of the boss 210 appear arc-shaped (also called D-shaped), and the inner plane of the boss 210 abuts against the first cut 120; and depending on the position of the external thread 110 and the processing requirements of the injection molded part 400, it can be as follows: Figure 5 As shown, the auxiliary shaft 200 is connected only at one end of the threaded insert 100, or it can be as follows: Figure 9 As shown, auxiliary shafts 200 are connected to both ends of the threaded insert 100.

[0028] It is important to note that Figure 6 The use of dashed lines to separate the auxiliary shaft 200 and the boss 210 is merely for the convenience of distinguishing the auxiliary shaft 200 and the boss 210. In reality, the auxiliary shaft 200 and the boss 210 can be two independent components connected to each other, or they can be two different parts on the same component.

[0029] In this embodiment, a first notch 120 is provided at the end of the threaded insert 100, which can eliminate the tail tooth 111 with too small a thickness at the end of the external thread 110. This can reduce the risk of end defects of the threaded insert 100, thereby improving the yield of the injection molded part 400 and reducing production costs. It can also prevent the injection molded part 400 from having a tail tooth boss due to the tail tooth 111, thereby preventing the injection molded part 400, which requires high-speed movement, from vibrating, making abnormal noises and unstable output power during movement. The boss 210 on the auxiliary shaft 200 can seal the first notch 120 through its concave-convex fit with the first notch 120, preventing the injection molded part 400 from failing to form due to the missing tail tooth 111.

[0030] In an optional embodiment, the auxiliary shaft 200 is detachably connected to the threaded insert 100 to improve the convenience of workers in disassembling and assembling the injection molding assembly; the specific methods of detachable connection include, but are not limited to, threaded connection, snap-fit ​​connection or plug-in connection.

[0031] In an optional embodiment, a positioning shaft 130 is provided at the end of the threaded insert 100 near the auxiliary shaft 200, and a positioning hole 220 is provided at the end of the auxiliary shaft 200 near the threaded insert 100. The positioning hole 220 matches the cross-sectional shape of the positioning shaft 130. The positioning shaft 130 is inserted into the positioning hole 220, which can realize the detachable connection between the threaded insert 100 and the auxiliary shaft 200, and can also provide positioning and guidance for the installation of the auxiliary shaft 200 by utilizing the hole-shaft cooperation between the positioning shaft 130 and the positioning hole 220.

[0032] In optional embodiments, the cross-sectional shape of the positioning shaft 130 is one of the following: polygonal (e.g., triangular, rectangular, or pentagonal), single-flat (also known as D-shaped), double-flat, or gear-shaped; the cross-sectional shape of the positioning shaft 130 matches the positioning shaft 130. For example... Figure 2 and Figure 3 As shown, the main body of the positioning shaft 130 is a circular shaft, but a second cut is machined on its top, making its cross-section appear as a single flat shape. After the positioning shaft 130 is inserted into the positioning hole 220, it can achieve a detachable connection between the threaded insert 100 and the auxiliary shaft 200, and also ensure that the relative angle between the threaded insert 100 and the auxiliary shaft 200 is correct. This eliminates the need for separate measurement and adjustment of the angle of the auxiliary shaft 200, thus improving the ease of installation of this injection molding assembly.

[0033] In an optional embodiment, the end of the positioning shaft 130 away from the threaded insert 100 is chamfered, and / or the opening of the positioning hole 220 is chamfered. The chamfer can provide guidance for the installation of the auxiliary shaft 200, thereby improving the ease of installation of the auxiliary shaft 200. The specific form of the chamfer includes, but is not limited to, a rounded corner, a square corner, or an elliptical corner.

[0034] In optional implementations, such as Figure 9 As shown, the two ends of the external thread 110 extend to the two ends of the thread insert 100 respectively. The two ends of the thread insert 100 are provided with a first cut 120 to cut off the tail tooth 111 at the corresponding end. The two ends of the thread insert 100 are connected to an auxiliary shaft 200. The auxiliary shaft 200 at both ends is provided with a boss 210 to cooperate with the corresponding first cut 120.

[0035] It should be noted that, depending on the structure of the injection molded part 400, the structures of the auxiliary shafts 200 at both ends of the threaded insert 100 can be the same or different. For example, in... Figure 9In the process, due to the different hole structure dimensions at both ends of the injection molded part 400, the dimensions of the auxiliary shafts 200 at both ends of the threaded insert 100 are also different.

[0036] Example 2 like Figures 7 to 10 As shown, an injection molding system includes a gating system for injecting plastic, and also includes the injection molding assembly of Embodiment 1. Plastic is injected into the outside of the injection molding assembly by the injection molding system to form an injection molded part 400 including internal thread features.

[0037] In an optional embodiment, the injection molding system further includes a magnetic ring 300, which is sleeved on the outside of the injection molding assembly. Depending on the actual processing requirements, the cross-sectional shape of the magnetic ring 300 may include, but is not limited to, a circular ring or a polygon (e.g., a rectangle or a hexagon). After the injection molding operation is performed between the magnetic ring 300 and the injection molding assembly, an injection molded part 400 encasing the magnetic ring 300 can be directly formed, which can then be used as a magnetic rotor.

[0038] In an optional embodiment, the thickness of the middle part of the magnetic ring 300 is greater than the thickness of the end of the magnetic ring 300. For example, the thickness of the magnetic ring 300 is gradually reduced from the middle to both sides along its length direction, or the thickness of the magnetic ring 300 is reduced in a stepwise manner from the middle to both sides along its length direction, so as to prevent the magnetic ring 300 from falling off the injection molded part 400.

[0039] In optional implementations, such as Figure 10 As shown, the magnetic ring 300 includes a constant thickness section 310 and a variable thickness section 320; the thickness of the constant thickness section 310 is ( Figure 10 The difference between dimension X and dimension Z remains constant along the length of the magnetic ring 300. Both ends of the constant thickness section 310 are connected to variable thickness sections 320; the outer diameters of the variable thickness section 320 and the constant thickness section 310 (…) Figure 10 Matching dimension X in the figure, the inner diameter of the variable thickness section is 320. Figure 10 The dimension Y in the middle is greater than the inner diameter of the 310 section with equal thickness. Figure 10 The inner diameter of the variable thickness section 320 is larger as it is further away from the constant thickness section 310. This not only forms a shoulder between the constant thickness section 310 and the variable thickness section 320, but also allows the inner surface of the variable thickness section 320 to form a conical surface, thereby further reducing the risk of the magnetic ring 300 falling off the injection molded part 400.

[0040] It is important to note that Figure 10 The use of dashed lines to separate the equal thickness segment 310 and the variable thickness segment 320 is merely for the convenience of distinguishing between them. In reality, the equal thickness segment 310 and the variable thickness segment 320 can be two independent components connected to each other, or they can be two different parts on the same component.

[0041] The above content is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An injection-molded assembly comprising a threaded insert (100), wherein an external thread (110) is provided on the outer side wall of the threaded insert (100), the external thread (110) extending to at least one end of the threaded insert (100), characterized in that: At least one end of the threaded insert (100) is provided with a first cut (120), the first cut (120) cuts off the tail tooth (111) of the external thread (110); the end of the threaded insert (100) provided with the first cut (120) is connected to an auxiliary shaft (200), and the end of the auxiliary shaft (200) near the threaded insert (100) is provided with a boss (210), the boss (210) and the first cut (120) are in concave-convex fit.

2. An injection molded assembly according to claim 1, wherein, The auxiliary shaft (200) is detachably connected to the threaded insert (100).

3. An injection molded assembly according to claim 2, wherein, The threaded insert (100) is provided with a positioning shaft (130) at the end near the auxiliary shaft (200), and the auxiliary shaft (200) is provided with a positioning hole (220) at the end near the threaded insert (100). The positioning hole (220) matches the cross-sectional shape of the positioning shaft (130), and the positioning shaft (130) is inserted into the positioning hole (220).

4. An injection molded assembly according to claim 3, wherein, The cross-sectional shape of the positioning shaft (130) is one of polygon, single flat, double flat, or gear shape.

5. An injection molded assembly as defined in claim 3, wherein, The end chamfer of the positioning shaft (130) away from the threaded insert (100), and / or the opening chamfer of the positioning hole (220).

6. An injection molding assembly according to any one of claims 1 to 5, characterized in that The two ends of the external thread (110) extend to the two ends of the threaded insert (100), and the two ends of the threaded insert (100) are provided with a first cut (120) and connected to the corresponding auxiliary shaft (200).

7. An injection molding system comprising a gating system, characterized in that It also includes an injection-molded component as described in any one of claims 1 to 6.

8. The injection molding system of claim 7, wherein, It also includes a magnetic ring (300) which is sleeved on the outside of the injection molding assembly.

9. An injection molding system as defined in claim 8, wherein The thickness of the middle part of the magnetic ring (300) is greater than the thickness of the end of the magnetic ring (300).

10. The injection molding system of claim 9, wherein, The magnetic ring (300) includes a constant thickness section (310) and a variable thickness section (320). The thickness of the constant thickness section (310) remains constant along the length direction of the magnetic ring (300). Both ends of the constant thickness section (310) are connected to the variable thickness section (320). The outer diameter of the variable thickness section (320) matches that of the constant thickness section (310). The inner diameter of the variable thickness section (320) is larger than that of the constant thickness section (310). The inner diameter of the variable thickness section (320) is larger the further away from the constant thickness section (310).

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