Metal insert assembly tolerance height automatic adjusting mechanism

Abstract

The utility model discloses a metal insert assembly tolerance height automatic adjusting mechanism which comprises a fixed die and a movable die, an adjusting needle is arranged between the fixed die and the movable die, the first end of the adjusting needle is connected with the fixed die in a sliding fit mode, and the second end of the adjusting needle is connected with the movable die in a sliding fit mode. A positioning step is arranged between the first end and the second end of the adjusting needle, the first end of the adjusting needle is sleeved with a spring, and the outer diameter of the positioning step is larger than or equal to the outer diameter of the metal insert; in the mold closing injection molding process of the mold, the dimensional tolerance of the metal insert can be elastically and adaptively compensated, and the problem that the metal insert is fractured or glue enters an inner hole of the metal insert is effectively avoided.

Description

Technical Field

[0001] This utility model belongs to the technical field of integrated injection molding of metal inserts, specifically relating to an automatic adjustment mechanism for the assembly tolerance height of metal inserts. Background Technology

[0002] With the trend towards lightweight manufacturing, plastic parts are increasingly replacing traditional sheet metal parts. To ensure the tensile and load-bearing strength requirements of these plastic parts in specific areas, metal inserts are often designed and injection molded together with them. However, due to dimensional tolerances in the metal insert manufacturing process, these tolerances often exceed the injection flash tolerance of the plastic parts, leading to the following problems:

[0003] When the dimensional tolerance of the metal insert is positive, interference occurs between the metal insert and the mold after the fixed and moving molds are closed, causing the metal insert to be crushed by the mold and damaging the mold itself. When the dimensional tolerance of the metal insert is negative, a gap exists between the end face of the metal insert and the mold surface after the fixed and moving molds are closed, allowing the plastic to enter the inner hole of the metal insert during subsequent injection molding. In other words, existing methods for injection molding plastic parts with integrated metal inserts suffer from the problem of the mold failing to accommodate the dimensional tolerances of the metal insert after mold closing.

[0004] Therefore, in view of the above-mentioned problems existing in the existing injection molding process of plastic parts and metal inserts, this utility model discloses an automatic adjustment mechanism for the assembly tolerance height of metal inserts. Utility Model Content

[0005] This utility model discloses an automatic adjustment mechanism for the assembly tolerance height of metal inserts. During the mold closing and injection molding process, it can elastically and adaptively compensate for the dimensional tolerance of metal inserts, effectively avoiding problems such as cracking of metal inserts or glue entering the inner hole of metal inserts.

[0006] This utility model is achieved through the following technical solution:

[0007] An automatic height adjustment mechanism for metal insert assembly tolerances includes a fixed mold and a moving mold. An adjustment pin is provided between the fixed mold and the moving mold. The first end of the adjustment pin is slidably connected to the fixed mold, and the second end of the adjustment pin is slidably connected to the moving mold. A positioning step is provided between the first end and the second end of the adjustment pin. A spring is sleeved on the outside of the first end of the adjustment pin. The outer diameter of the positioning step is greater than or equal to the outer diameter of the metal insert.

[0008] Install the spring and adjusting pin on the fixed mold, and place the metal insert on the end of the adjusting pin closest to the moving mold, so that the end face of the metal insert abuts against the step surface of the positioning step. Then, begin closing the fixed and moving molds until the metal insert reaches the height tolerance position. Adjust the spring preload to press the adjusting pin with appropriate elasticity, which in turn presses the metal insert towards the moving mold through the positioning step of the adjusting pin, ensuring that the end face of the metal insert is tightly against the moving mold. The spring tension automatically compensates for the height tolerance of the metal insert. Injection molding can then be performed in the cavity between the fixed and moving molds, allowing the metal insert to be injection molded together.

[0009] To better realize this utility model, a flange is further provided between the first end of the adjusting pin and the positioning step, and the flange is slidably connected to the fixed mold; one end of the spring abuts against the end face of the flange away from the moving mold.

[0010] To better realize this utility model, the fixed mold is further provided with a stepped sliding hole, the flange is slidably connected to the large diameter section of the stepped sliding hole, a pressure plate is provided at the opening of the stepped sliding hole away from the moving mold, the first end of the adjusting pin is slidably connected to the through hole on the pressure plate; one end of the spring abuts against the end face of the pressure plate, and the other end of the spring abuts against the end face of the flange away from the moving mold.

[0011] To better realize this utility model, the flange is further provided with a first mating section and a second mating section coaxially at both ends. The first mating section is slidably connected to the through hole on the pressure plate, and the second mating section is slidably connected to the small diameter section of the stepped sliding hole. A third mating section is coaxially provided at the end of the second mating section near the moving mold, and a positioning step is formed between the second mating section and the third mating section.

[0012] To better realize this utility model, the outer diameter of the positioning step is larger than the outer diameter of the metal insert, and the difference between the outer diameter of the positioning step and the outer diameter of the metal insert is less than or equal to 0.2mm.

[0013] To better realize this utility model, the pressure plate is further provided with a connecting hole, and an adjusting screw is inserted through the connecting hole. The adjusting screw is connected to the threaded hole on the fixed mold.

[0014] To better realize this utility model, the moving mold is further provided with a guide hole, and the second end of the adjusting pin is slidably connected to the guide hole.

[0015] To better realize this utility model, the second end of the adjusting pin is further provided with a guide cone surface.

[0016] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0017] This invention features an adjusting pin that slides on a fixed mold and a spring fitted around the first end of the adjusting pin. The adjusting pin, with an outer diameter greater than or equal to that of the metal insert, presses the end face of the metal insert firmly. The spring force adaptively compensates for the dimensional tolerances of the metal insert, preventing damage or cracking when the mold closes if the dimensional tolerance is positive, and preventing the mold adhesive from entering the inner hole of the metal insert when the dimensional tolerance is negative. Ultimately, this ensures the safe and normal operation of the integrated injection molding of the plastic part and the metal insert. Attached Figure Description

[0018] Figure 1 A schematic diagram of a mechanism for automatically adjusting the height tolerance of metal inserts;

[0019] Figure 2 for Figure 1 A magnified view of part A;

[0020] Figure 3 This is a diagram showing the installation of the adjusting pin;

[0021] Figure 4 This is a schematic diagram of the adjusting needle.

[0022] Figure 5 This is a schematic diagram showing that the height of the metal insert has a positive tolerance in the existing mold closing process;

[0023] Figure 6 This is a schematic diagram showing that the height of the metal insert has a negative tolerance in the existing mold closing process;

[0024] Figure 7 This is a schematic diagram showing the metal insert height with positive tolerance during the mold closing process of this utility model;

[0025] Figure 8 This is a schematic diagram showing the negative tolerance in the height of the metal insert during the mold closing process of this utility model.

[0026] Wherein: 1-fixed mold; 2-moving mold; 3-adjusting pin; 4-positioning step; 5-spring; 6-flange; 7-pressure plate; 8-adjusting screw; 100-first mating section; 200-second mating section; 300-third mating section. Detailed Implementation

[0027] Example 1:

[0028] This embodiment provides an automatic height adjustment mechanism for metal insert assembly tolerances, such as... Figures 1-4As shown, it includes a fixed mold 1 and a moving mold 2. An adjusting pin 3 is provided between the fixed mold 1 and the moving mold 2. The first end of the adjusting pin 3 is slidably connected to the fixed mold 1, and the second end of the adjusting pin 3 is slidably connected to the moving mold 2. A positioning step 4 is provided between the first end and the second end of the adjusting pin 3. A spring 5 is sleeved on the outside of the first end of the adjusting pin 3. The outer diameter of the positioning step 4 is greater than or equal to the outer diameter of the metal insert.

[0029] like Figure 5 As shown, the cavity height is H0 when the fixed mold 1 and the moving mold 2 are closed. In the existing one-piece injection molding process of metal inserts, if the height of the metal insert is a positive tolerance H0+h, for example, 20+0.2mm, then during injection molding, since the cavity height H0 is 20mm when the fixed mold 1 and the moving mold 2 are closed to the injection position, the height of the metal insert H0+h is actually greater than the cavity height. Consequently, when the fixed mold 1 and the moving mold 2 are closed, the mold closing surface will interfere with the metal insert and crack the metal insert.

[0030] like Figure 6 As shown, the cavity height is H0 when the fixed mold 1 and the moving mold 2 are closed. If the height of the metal insert has a negative tolerance H0-h, for example, 20-0.2mm, then during injection molding, since the cavity height H0 is 20mm when the fixed mold 1 and the moving mold 2 are closed to the injection position, the height H0-h of the metal insert is actually less than the cavity height. Consequently, when the fixed mold 1 and the moving mold 2 are closed, there is a gap between the mold closing surface and the metal insert, causing the injection molding liquid to enter the inner hole of the metal insert.

[0031] like Figures 1-4 As shown, in this embodiment, an adjusting pin 3 is slidably mounted on the fixed mold 1, and a spring 5 provides a preload force to the adjusting pin 3. This ensures that the end face of the positioning step 4 of the adjusting pin 3 is always pressed against the end face of the metal insert under the elastic force of the spring 5, and that the end face of the metal insert closest to the moving mold is tightly attached to the surface of the moving mold during mold closing. Furthermore, since the outer diameter of the positioning step 4 is greater than or equal to the outer diameter of the metal insert, even if the height of the metal insert has a positive tolerance, such as... Figure 7 As shown, the fixed mold 1 and the moving mold 2 will not directly squeeze the metal insert during mold closing, thus avoiding cracking of the metal insert. Figure 8 As shown, if the height of the metal insert has a negative tolerance, the step surface of the positioning step 4 will always press against the end face of the metal insert under the action of the spring 5, thus preventing the glue from entering the inner hole of the metal insert during injection molding.

[0032] Example 2:

[0033] This embodiment discloses an automatic adjustment mechanism for the assembly tolerance height of metal inserts, which is further optimized based on Embodiment 1, such as... Figures 2-4As shown, a flange 6 is provided between the first end of the adjusting pin 3 and the positioning step 4, and the flange 6 is slidably connected to the fixed mold 1; one end of the spring 5 abuts against the end face of the flange 6 away from the moving mold. The sliding connection structure between the flange 6 and the fixed mold 1 guides the adjusting pin 3 when it is pressed and slides, ensuring smooth movement of the adjusting pin 3. Simultaneously, the spring 5 applies elastic force to the end face of the flange 6, pre-tightening the adjusting pin 3.

[0034] The other parts of this embodiment are the same as those in Embodiment 1, so they will not be described again.

[0035] Example 3:

[0036] This embodiment discloses an automatic adjustment mechanism for the assembly tolerance height of metal inserts, which is further optimized based on the above embodiment 1 or 2, such as... Figure 1 and Figure 2 As shown, the fixed mold 1 is provided with a stepped sliding hole, the flange 6 is slidably connected to the large diameter section of the stepped sliding hole, a pressure plate 7 is provided at the opening of the stepped sliding hole away from the moving mold 2, the first end of the adjusting pin 3 is slidably connected to the through hole on the pressure plate 7; one end of the spring 5 abuts against the end face of the pressure plate 7, and the other end of the spring 5 abuts against the end face of the flange 6 away from the moving mold.

[0037] The cooperation between the pressure plate 7 and the flange 6 ensures that the bottom end of the spring 5 presses the upper end face of the flange 6 tightly. At the same time, by adjusting the pressure of the pressure plate 7 on the top of the spring 5, the preload of the spring 5 can be finely adjusted.

[0038] Furthermore, such as Figure 3 and Figure 4 As shown, the flange 6 has a first mating section 100 and a second mating section 200 coaxially arranged at both ends. The first mating section 100 is slidably connected to the through hole on the pressure plate 7, and the second mating section 200 is slidably connected to the small diameter section of the stepped sliding hole. The end of the second mating section 200 near the moving mold 2 has a third mating section 300 coaxially arranged, and a positioning step 4 is formed between the second mating section 200 and the third mating section 300.

[0039] The second mating section 200 is slidably connected to the small-diameter section of the stepped sliding hole, while the third mating section 300 is mated to the inner hole of the metal insert, thereby ensuring that the adjusting pin 3 can press the metal insert vertically and avoid the situation where the step surface of the positioning step 4 cannot be tightly fitted to the upper end surface of the metal insert due to the swaying of the adjusting pin 3.

[0040] Furthermore, the outer diameter of the positioning step 4 is larger than the outer diameter of the metal insert, and the difference between the outer diameter of the positioning step 4 and the outer diameter of the metal insert is less than or equal to 0.2 mm.

[0041] Preferably, if the metal insert is a soft metal such as copper or aluminum, the difference between the outer diameter of the positioning step 4 and the outer diameter of the metal insert is between 0.1 mm and 0.2 mm; if the metal insert is a hard metal such as steel or aluminum alloy, the difference between the outer diameter of the positioning step 4 and the outer diameter of the metal insert is less than or equal to 0.15 mm.

[0042] The other parts of this embodiment are the same as those in Embodiment 1 or 2 above, so they will not be described again.

[0043] Example 4:

[0044] This embodiment discloses an automatic adjustment mechanism for the assembly tolerance height of metal inserts, which is further optimized based on any one of embodiments 1-3 above, such as... Figure 2 As shown, the pressure plate 7 is provided with a connecting hole, and an adjusting screw 8 is inserted through the connecting hole. The adjusting screw 8 is connected to the threaded hole on the fixed mold 1.

[0045] By adjusting the screw 8 to press the pressure plate 7, and by turning the adjusting screw 8, the pressing force of the pressure plate 7 on the spring 5 can be adjusted to a certain extent, thereby adjusting the preload of the spring 5.

[0046] The other parts of this embodiment are the same as any one of the embodiments 1-3 above, so they will not be described again.

[0047] Example 5:

[0048] This embodiment discloses an automatic adjustment mechanism for the assembly tolerance height of metal inserts, which is further optimized based on any one of embodiments 1-4 above, such as... Figure 2 As shown, the moving mold 2 is provided with a guide hole, and the second end of the adjusting pin 3 is slidably connected to the guide hole. The second end of the adjusting pin 3 is provided with a guide cone surface. By providing a guide hole on the moving mold 2, the second end of the adjusting pin 3 can smoothly enter the interior of the guide hole through the guide cone surface, thereby guiding the smooth downward pressing of the adjusting pin 3 and ensuring that the step surface of the positioning step 4 of the adjusting pin 3 can press positively on the top end face of the metal insert.

[0049] The other parts of this embodiment are the same as any one of the embodiments 1-4 above, so they will not be described again.

[0050] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. An automatic height adjustment mechanism for metal insert assembly tolerances, comprising a fixed mold (1) and a moving mold (2), characterized in that, An adjusting pin (3) is provided between the fixed mold (1) and the moving mold (2). The first end of the adjusting pin (3) is slidably connected to the fixed mold (1), and the second end of the adjusting pin (3) is slidably connected to the moving mold (2). A positioning step (4) is provided between the first end and the second end of the adjusting pin (3). A spring (5) is sleeved on the outside of the first end of the adjusting pin (3). The outer diameter of the positioning step (4) is greater than or equal to the outer diameter of the metal insert.

2. The automatic height adjustment mechanism for metal insert assembly tolerance according to claim 1, characterized in that, A flange (6) is provided between the first end of the adjusting pin (3) and the positioning step (4), and the flange (6) is slidably connected to the fixed mold (1); one end of the spring (5) abuts against the end face of the flange (6) away from the moving mold.

3. The automatic height adjustment mechanism for metal insert assembly tolerance according to claim 2, characterized in that, The fixed mold (1) is provided with a stepped sliding hole, the flange (6) is slidably connected to the large diameter section of the stepped sliding hole, a pressure plate (7) is provided at the opening of the stepped sliding hole away from the moving mold (2), the first end of the adjusting pin (3) is slidably connected to the through hole on the pressure plate (7); one end of the spring (5) abuts against the end face of the pressure plate (7), and the other end of the spring (5) abuts against the end face of the flange (6) away from the moving mold.

4. The automatic height adjustment mechanism for metal insert assembly tolerance according to claim 3, characterized in that, The flange (6) has a first mating section (100) and a second mating section (200) coaxially arranged at both ends. The first mating section (100) is slidably connected to the through hole on the pressure plate (7). The second mating section (200) is slidably connected to the small diameter section of the stepped sliding hole. The end of the second mating section (200) near the moving mold (2) is coaxially provided with a third mating section (300). A positioning step (4) is formed between the second mating section (200) and the third mating section (300).

5. The automatic height adjustment mechanism for metal insert assembly tolerance according to claim 4, characterized in that, The outer diameter of the positioning step (4) is greater than the outer diameter of the metal insert, and the difference between the outer diameter of the positioning step (4) and the outer diameter of the metal insert is less than or equal to 0.2 mm.

6. The automatic height adjustment mechanism for metal insert assembly tolerance according to claim 5, characterized in that, The pressure plate (7) is provided with a connecting hole, and an adjusting screw (8) is inserted through the connecting hole. The adjusting screw (8) is connected to the threaded hole on the fixed mold (1).

7. The automatic height adjustment mechanism for metal insert assembly tolerance according to any one of claims 1-6, characterized in that, The moving mold (2) is provided with a guide hole, and the second end of the adjusting pin (3) is slidably connected to the guide hole.

8. The automatic height adjustment mechanism for metal insert assembly tolerance according to claim 7, characterized in that, The second end of the adjusting pin (3) is provided with a guide cone surface.

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