Positioning mechanism for embedded blind nut product and its embedding nut process

Abstract

The application discloses a positioning mechanism of a buried blind hole nut product and a buried nut process thereof, and belongs to the technical field of plastic injection molding. The positioning mechanism comprises a male mold positioning sleeve, the inner wall of the male mold positioning sleeve is a hollow cavity for clamping a buried nut, and the male mold positioning sleeve is used for placing the buried nut into an upper product cavity. The positioning mechanism further comprises a female mold positioning rod, the buried nut is provided with a blind hole, and one end of the female mold positioning rod is matched with the blind hole. The positioning mechanism further comprises a male mold core which is located in the hollow cavity and one end of the male mold core abuts against the buried nut. The male mold positioning sleeve and the female mold positioning rod are coaxially arranged and have axial reciprocating freedom relative to the male mold core. After one end of the female mold positioning rod is matched with the blind hole, the male mold positioning sleeve is withdrawn from the upper product cavity and is separated from the buried nut, molten plastic is injected into the upper product cavity, and the buried nut is wrapped. The application uses the male mold positioning sleeve and the female mold positioning rod to exchange with each other, exposes all outer walls of the buried nut, and uses the plastic to bond and solidify, so that the position accuracy of the buried nut is ensured, and the metal sheet in the traditional process is saved.

Description

Technical Field

[0001] This invention relates to the field of fastener injection molding, specifically to a positioning mechanism for embedded blind hole nuts and the nut embedding process. Background Technology

[0002] Plastic parts with pre-embedded nuts are a common basic component in the 3C industry. It is actually a composite product, which contains at least two materials: metal and plastic. Because the pre-embedded nut is usually a metal part, it often needs to be welded to a metal sheet. Then the entire pre-embedded nut and the metal sheet are wrapped in plastic, ultimately forming a sturdy component that meets the specific shape and structural requirements.

[0003] In existing technologies, metal sheets are often indispensable for producing such components because they are essential for the spatial positioning of small-volume embedded nuts during processing; otherwise, the spatial position of the embedded nuts will be inaccurate. However, given the improved performance of various composite plastics, from a stress performance perspective, these metal sheets are sometimes unnecessary, yet they are difficult to discard under current processes. Summary of the Invention

[0004] The problem to be solved by this invention is to provide a positioning mechanism for embedded blind hole nuts and its embedding process. By using the mutual exchange of the male mold positioning sleeve and the female mold positioning rod, all the outer walls of the embedded nut are exposed and then bonded and solidified with plastic, ensuring the positional accuracy of the embedded nut and eliminating the need for metal sheets in traditional processes.

[0005] To solve the above problems, the present invention provides a positioning mechanism for embedded blind hole nuts and a nut embedding process. To achieve the above objectives, the technical solution adopted by the present invention to solve its technical problems is as follows:

[0006] The positioning mechanism for the embedded blind hole nut product includes: a male mold positioning sleeve, the inner wall of which is a hollow cavity for holding the embedded nut, the male mold positioning sleeve placing the embedded nut into the upper product cavity; a female mold positioning rod, one end of which engages with the blind hole in the embedded nut; a male mold core, located in the hollow cavity, one end of which abuts against the embedded nut; the male mold positioning sleeve and the female mold positioning rod are coaxially arranged and have axial reciprocating freedom relative to the male mold core; when one end of the female mold positioning rod engages with the blind hole, the male mold positioning sleeve exits from the upper product cavity and peels off from the embedded nut, molten plastic is injected into the upper product cavity to encapsulate the embedded nut.

[0007] The beneficial effects of adopting the above technical solution are: This technical solution can be used in injection molds to modify existing injection molds. By using the male mold positioning sleeve and female mold positioning rod that enter and exit the upper product cavity in sequence, the components that restrict the spatial position of the embedded nut can be transferred. That is, the contact between the outer wall of the embedded nut and the center of the embedded nut is changed from clamping to limiting contact. This frees up all the outer wall of the embedded nut, making it easier for molten plastic to fill in and fully and tightly contact and solidify with the outer wall of the embedded nut.

[0008] This solution cleverly utilizes the back-and-forth exchange process between the male mold positioning sleeve and the female mold positioning rod. During this exchange, the pre-embedded nut is less likely to loosen or shift position, thus ensuring the precise positioning of the pre-embedded nut after final solidification. Furthermore, it eliminates the need for metal sheets used in traditional processes.

[0009] The male mold core also serves to further limit the axial direction of the pre-embedded nut.

[0010] As a further improvement of the present invention, the male mold core has a boss that abuts against the pre-embedded nut, and the diameter of the boss is smaller than the inner diameter of the hollow cavity.

[0011] The advantages of adopting the above technical solution are: the smaller boss ensures that the space occupied by the boss is not filled with plastic. However, due to the small size of the boss, the plastic at the shaft end of the pre-embedded nut will still wrap around its outer perimeter, allowing the outer plastic to achieve a stable axial engagement with the inner pre-embedded nut.

[0012] As a further improvement of the present invention, the outer circumferential surface of the pre-embedded nut has several circumferential grooves, and the molten plastic is also injected into the circumferential grooves.

[0013] The beneficial effects of adopting the above technical solution are: the circumferential groove increases the contact area between the plastic and the pre-embedded nut, improves the axial engagement ability of the two, and enables the two parts of different materials to be stably engaged together.

[0014] As a further improvement of the present invention, the bottom of the blind hole has a conical cavity that is not filled by the positioning rod of the master mold.

[0015] The beneficial effects of adopting the above technical solution are: the conical cavity facilitates the processing of blind holes and provides a certain space for air to be contained, which makes it easier for the positioning rod of the female mold to be inserted into place.

[0016] As a further improvement of the present invention, the female mold positioning rod includes a lower insertion section and a thickened section. The outer diameter of the lower insertion section is smaller than the outer diameter of the thickened section. The lower insertion section and the thickened section are connected by a vertical annular stepped surface. The lower insertion section is fitted with a blind hole.

[0017] The beneficial effects of adopting the above technical solution are: the positioning rod of the mother mold is in the shape of a stepped shaft, and the annular stepped surface can play a limiting role in axial movement.

[0018] As a further improvement of the present invention, a washer is provided at the top opening of the upper product cavity. When the female mold positioning rod moves to the limit position where it engages with the pre-embedded nut, the annular stepped surface contacts the shaft end of the pre-embedded nut, and the inner ring of the washer engages with the thickened section of the female mold positioning rod.

[0019] The beneficial effect of adopting the above technical solution is that the washer ensures the tightness between this part and the positioning rod of the female mold.

[0020] As a further improvement of the present invention, the female mold positioning rod is arranged above the male mold positioning sleeve, and both the female mold positioning rod and the male mold positioning sleeve are arranged vertically; the root of the boss is at the same horizontal plane as the bottom surface of the upper product cavity, and when the male mold positioning sleeve moves to the extreme position away from the female mold positioning rod, the top of the male mold positioning sleeve is also at the same horizontal plane as the bottom surface of the upper product cavity.

[0021] The beneficial effect of adopting the above technical solution is that it ensures the shape of the bottom after the plastic solidifies.

[0022] As a further improvement of the present invention, a male mold core is provided outside the male mold positioning sleeve, and a male mold pad is provided below the male mold core. The bottom surface of the male mold core itself forms a lower cavity. The bottom of the lower cavity is connected to the upper product cavity through a vertical cavity. The male mold positioning sleeve is movably disposed in the vertical cavity. A lower ejector plate and an upper ejector plate are provided in the lower cavity and are fixed to each other. The lower ejector plate and the upper ejector plate are fixed to the bottom of the male mold positioning sleeve itself. The lower ejector plate and the upper ejector plate move vertically up and down in the lower cavity.

[0023] The beneficial effects of adopting the above technical solution are: it refines the positional state of this mechanism in the injection mold; and the lower ejector plate and upper ejector plate have degrees of freedom.

[0024] As a further improvement of the present invention, the male mold core is also provided with a vertical channel parallel to the vertical cavity, and a movable male mold return pin is provided in the vertical channel. The bottom of the male mold positioning sleeve, the bottom of the male mold return pin, the bottom of the male mold core, and the top of the female mold positioning rod are all provided with an integral radially outward expanding radial flange. The bottom of the male mold positioning sleeve and the bottom of the male mold return pin are clamped by the lower ejector plate and the upper ejector plate, and the lower ejector plate and the upper ejector plate are fixed by screws. The bottom of the male mold core is fixed to the male mold pad. The top surface of the male mold pad is recessed with a limiting recess, and a floating spring is provided in the limiting recess. The floating spring applies an upward elastic force to the lower ejector plate.

[0025] The beneficial effects of adopting the above technical solution are: the lower ejector plate and the upper ejector plate make it possible to disassemble and assemble the male mold positioning sleeve. The male mold core ensures the relative stability of its spatial position. The floating spring ensures that the male mold positioning sleeve has an upward elastic force.

[0026] The embedded nut process, including the positioning mechanism for embedded blind hole nuts as mentioned above, includes:

[0027] Step 1: The male mold positioning sleeve and the female mold positioning rod are both at their highest extreme positions.

[0028] Step 2: Insert the pre-embedded nut into the hollow cavity of the male mold positioning sleeve. The top of the pre-embedded nut is higher than the top of the male mold positioning sleeve, and the pre-embedded nut is located in the upper product cavity.

[0029] Step 3: The female mold positioning rod descends and assembles with the blind hole of the pre-embedded nut. When the female mold positioning rod descends to its lowest limit position, the male mold positioning sleeve starts and descends to its lowest limit position.

[0030] Step 4: Once the mold is closed, molten plastic is injected into the upper product cavity to enclose the pre-embedded nut.

[0031] Step 5: The molten plastic solidifies and forms the injection molded part. The male mold positioning sleeve and the female mold positioning rod rise synchronously and at the same speed, and the injection molded part separates from the inner wall of the upper product cavity.

[0032] Step 6: After the male mold positioning sleeve moves to its highest limit position, the female mold positioning rod continues to rise until the vertical distance between the female mold positioning rod and the male mold positioning sleeve is greater than the height of the injection molded part.

[0033] Step 7: Remove the pre-embedded nut containing the injection molded part from the positioning rod of the master mold; return to step 1 and begin the next cycle.

[0034] The beneficial effects of adopting the above technical solution are: the process steps ensure the exchange process between the male mold positioning sleeve and the female mold positioning rod, and the final injection-molded and solidified finished product has a better effect. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a perspective view of a prior art invention;

[0037] Figure 2 This is a perspective view of one embodiment of the present invention;

[0038] Figure 3 This is a perspective view of one embodiment of the present invention;

[0039] Figure 4 This is a longitudinal sectional view of one embodiment of the present invention;

[0040] Figure 5 This is a longitudinal sectional view of one embodiment of the present invention;

[0041] Figure 6 This is a partially enlarged view of one embodiment of the present invention;

[0042] Figure 7 This is a partially enlarged view of one embodiment of the present invention.

[0043] 1-Injection part; 2-Mold core; 200-Lower cavity; 201-Upper product cavity; 202-Vertical cavity; 203-Vertical runner; 3-Mold backing plate; 300-Limiting recess; 4-Floating spring; 5-Lower ejector plate; 6-Upper ejector plate; 7-Mold positioning sleeve; 700-Upper insertion section; 701-Hollow cavity; 8-Embedded nut; 800-Circumferential groove; 801-Blind hole; 802-Conical cavity; 9-Mold positioning rod; 900-Lower insertion section; 901-Annular step surface; 902-Thickened section; 10-Mold return pin; 1000-Exposed section; 11-Screw; 12-Mold core; 1200-Boss; 20-Washer; 21-Radial flange; 30-Wrapped plastic; 31-Bending plate; 32-Metal nut. Detailed Implementation

[0044] The present invention will be further described in detail below with reference to specific embodiments:

[0045] To achieve the purpose of this invention, the positioning mechanism for the embedded blind hole nut product includes: a male mold positioning sleeve 7, whose inner wall is a hollow cavity 701 for clamping the pre-embedded nut 8, and the male mold positioning sleeve 7 places the pre-embedded nut 8 into the upper product cavity 201; a female mold positioning rod 9, the pre-embedded nut 8 having a blind hole 801, one end of the female mold positioning rod 9 engaging with the blind hole 801; a male mold core 12, located inside the hollow cavity 701, one end of the male mold core 12 abutting against the pre-embedded nut 8; the male mold positioning sleeve 7 and the female mold positioning rod 9 are coaxially arranged and have axial reciprocating freedom relative to the male mold core 12; when one end of the female mold positioning rod 9 engages with the blind hole 801, the male mold positioning sleeve 7 exits from the upper product cavity 201 and peels off from the pre-embedded nut 8, and molten plastic is injected into the upper product cavity 201 to wrap the pre-embedded nut 8.

[0046] The beneficial effects of adopting the above technical solution are as follows: This technical solution can be used in injection molds to modify existing injection molds. By utilizing the male mold positioning sleeve and female mold positioning rod, which enter and exit the upper product cavity sequentially, the components that restrict the spatial position of the embedded nut are transferred. That is, the contact between the male mold positioning sleeve and the female mold positioning rod is changed from clamping the outer wall of the embedded nut to limiting the contact between the center of the embedded nut and the outer wall. This frees up all the outer wall of the embedded nut, making it easier for the molten plastic to fill in and fully and tightly contact and solidify with the outer wall of the embedded nut. This solution cleverly utilizes the back-and-forth exchange process between the male mold positioning sleeve and the female mold positioning rod. At the same time, the embedded nut is not prone to loosening or displacement during this exchange process, thus ensuring the positional accuracy of the embedded nut after final solidification. In addition, it also eliminates the need for metal sheets in traditional processes. The male mold core also plays a role in further axially limiting the embedded nut.

[0047] In some other embodiments of the present invention, the male mold core 12 has a boss 1200 that abuts against the pre-embedded nut 8, the diameter of the boss 1200 being smaller than the inner diameter of the hollow cavity 701.

[0048] The advantages of adopting the above technical solution are: the smaller boss ensures that the space occupied by the boss is not filled with plastic. However, due to the small size of the boss, the plastic at the shaft end of the pre-embedded nut will still wrap around its outer perimeter, allowing the outer plastic to achieve a stable axial engagement with the inner pre-embedded nut.

[0049] In some other embodiments of the present invention, the outer circumferential surface of the pre-embedded nut 8 has a plurality of circumferential grooves 800, and the molten plastic is also injected into the circumferential grooves 800.

[0050] The beneficial effects of adopting the above technical solution are: the circumferential groove increases the contact area between the plastic and the pre-embedded nut, improves the axial engagement ability of the two, and enables the two parts of different materials to be stably engaged together.

[0051] In other embodiments of the present invention, the bottom of the blind hole 801 has a conical cavity 802 that is not filled by the female mold positioning rod 9.

[0052] The beneficial effects of adopting the above technical solution are: the conical cavity facilitates the processing of blind holes and provides a certain space for air to be contained, which makes it easier for the positioning rod of the female mold to be inserted into place.

[0053] In some other embodiments of the present invention, the female mold positioning rod 9 includes a lower insertion section 700 and a thickened section 902. The outer diameter of the lower insertion section 700 is smaller than the outer diameter of the thickened section 902. The lower insertion section 700 and the thickened section 902 are connected by a vertical annular step surface 901. The lower insertion section 900 is engaged with the blind hole 801.

[0054] The beneficial effects of adopting the above technical solution are: the positioning rod of the mother mold is in the shape of a stepped shaft, and the annular stepped surface can play a limiting role in axial movement.

[0055] In some other embodiments of the present invention, a washer 20 is provided at the top opening of the upper product cavity 201. When the female mold positioning rod 9 moves to the limit position that engages with the pre-embedded nut 8, the annular step surface 901 contacts the shaft end of the pre-embedded nut 8, and the inner ring of the washer 20 engages with the thickened section 902 of the female mold positioning rod 9.

[0056] The beneficial effect of adopting the above technical solution is that the washer ensures the tightness between this part and the positioning rod of the female mold.

[0057] In some other embodiments of the present invention, the female mold positioning rod 9 is arranged above the male mold positioning sleeve 7, and both the female mold positioning rod 9 and the male mold positioning sleeve 7 are arranged vertically; the root of the boss 1200 is at the same horizontal plane as the bottom surface of the upper product cavity 201, and when the male mold positioning sleeve 7 moves to the extreme position away from the female mold positioning rod 9, the top of the male mold positioning sleeve 7 is also at the same horizontal plane as the bottom surface of the upper product cavity 201.

[0058] The beneficial effect of adopting the above technical solution is that it ensures the shape of the bottom after the plastic solidifies.

[0059] In some other embodiments of the present invention, a male mold core 2 is provided outside the male mold positioning sleeve 7, and a male mold pad 3 is provided below the male mold core 2. The bottom surface of the male mold core 2 itself forms a lower cavity 200. The bottom of the lower cavity 200 is connected to the upper product cavity 201 through a vertical cavity 202. The male mold positioning sleeve 7 is movably disposed in the vertical cavity 202. A lower ejector plate 5 and an upper ejector plate 6 are provided in the lower cavity 200 and are fixed to each other. The lower ejector plate 5 and the upper ejector plate 6 are fixed to the bottom of the male mold positioning sleeve 7 itself, and the lower ejector plate 5 and the upper ejector plate 6 move vertically up and down in the lower cavity 200.

[0060] The beneficial effects of adopting the above technical solution are: it refines the positional state of this mechanism in the injection mold; and the lower ejector plate and upper ejector plate have degrees of freedom.

[0061] In some other embodiments of the present invention, the male mold core 2 is further provided with a vertical channel 203 parallel to the vertical cavity 202. A movable male mold return pin 10 is provided in the vertical channel 203. The bottom of the male mold positioning sleeve 7, the bottom of the male mold return pin 10, the bottom of the male mold core 12, and the top of the female mold positioning rod 9 are all provided with an integral radially outwardly expanding radial flange 21. The bottom of the male mold positioning sleeve 7 and the bottom of the male mold return pin 10 are clamped by the lower ejector plate 5 and the upper ejector plate 6. The lower ejector plate 5 and the upper ejector plate 6 are fixed by screws 11. The bottom of the male mold core 12 is fixed to the male mold pad 3. The top surface of the male mold pad 3 is recessed with a limiting recess 300. A floating spring 4 is provided in the limiting recess 300. The floating spring 4 applies an upward elastic force to the lower ejector plate 5.

[0062] The beneficial effects of adopting the above technical solution are: the lower ejector plate and the upper ejector plate make it possible to disassemble and assemble the male mold positioning sleeve. The male mold core ensures the relative stability of its spatial position. The floating spring ensures that the male mold positioning sleeve has an upward elastic force.

[0063] In other embodiments of the present invention, the embedded nut process includes the positioning mechanism for the embedded blind hole nut product mentioned above, comprising: Step 1, both the male mold positioning sleeve 7 and the female mold positioning rod 9 are at their highest limit positions; Step 2, the embedded nut 8 is inserted into the hollow cavity 701 of the male mold positioning sleeve 7, the top of the embedded nut 8 is higher than the top of the male mold positioning sleeve 7, and the embedded nut 8 is located in the upper product cavity 201; Step 3, the female mold positioning rod 9 descends and assembles with the blind hole 801 of the embedded nut 8, and when the female mold positioning rod 9 descends to its lowest limit position, the male mold positioning sleeve 7 is activated and descends to its lowest limit position; Step 4... In step five, the molten plastic is injected into the upper product cavity 201 and encapsulates the pre-embedded nut 8. Then, the molten plastic solidifies to form the injection molded part. The male mold positioning sleeve 7 and the female mold positioning rod 9 rise synchronously and at the same speed, separating the injection molded part from the inner wall of the upper product cavity 201. In step six, after the male mold positioning sleeve 7 reaches its highest limit position, the female mold positioning rod 9 continues to rise until the vertical distance between the female mold positioning rod 9 and the male mold positioning sleeve 7 is greater than the height of the injection molded part 1. In step seven, the pre-embedded nut 8 encapsulating the injection molded part 1 is detached from the female mold positioning rod 9. The process returns to step one and begins the next cycle.

[0064] The beneficial effects of adopting the above technical solution are: the process steps ensure the exchange process between the male mold positioning sleeve and the female mold positioning rod, and the final injection-molded and solidified finished product has a better effect.

[0065] like Figure 1As shown, this is a common type of product in the prior art. The bending plate 31 and the metal nut 32 are both metal parts. The metal nut 32 is pre-welded and fixed to the bending plate 31, and then molten plastic is poured on it, which finally solidifies into a plastic wrapping 30.

[0066] Figure 6 Right now Figure 4 A magnified view of a portion of the image. Figure 7 Right now Figure 5 A magnified view of a portion of the image.

[0067] Figure 4 , Figure 5 These are two typical extreme position states. The part of the male mold positioning sleeve 7 that enters the upper product cavity 201 is the upper insertion section 700 of the male mold positioning sleeve 7.

[0068] like Figure 4 As shown, when the male mold return pin 10 moves to its highest limit position, its top forms an exposed section 1000 protruding from the male mold core 2. Several male mold return pins 10 are symmetrically distributed on both sides of the male mold positioning sleeve 7.

[0069] This technical solution directly uses a mold mechanism to automatically embed the nut, eliminating the nut riveting process and saving costs.

[0070] In actual operation, when the mold opens, the male mold return pin 10, under the action of the floating spring 4, is in a floating ejection state. The male mold return pin 10 is fixed between the upper ejector plate 6 and the lower ejector plate 5, and secured with screws 11. The floating spring 4 is inserted into the groove of the male mold pad 3 for positioning and pre-compression. The pre-embedded nuts 8, terminals, and other embedded components are then sequentially inserted to maintain stable positioning of the embedded parts. (Reference) Figure 4 The image shows the state before mold closing. During the mold closing movement, the male mold return pin 10, in its popped-out state by the floating spring 4, is gradually pressed back into place by the female mold closing surface; simultaneously, the female mold positioning rod 9 performs a mold closing movement, achieving precise positioning between the female mold positioning rod 9 and the pre-embedded nut 8; at the same time, the male mold positioning sleeve 7, guided by the male mold core 12, synchronously retracts to the surface of the injection molded part 1. (Reference) Figure 5 The image shows the mold after it is closed. Once the mold is closed, the product containing the pre-embedded nut 8 is injected and molded, and the cycle repeats.

[0071] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A positioning mechanism for embedded blind hole nuts, characterized in that, include: The male mold positioning sleeve has a hollow cavity on its inner wall that holds the pre-embedded nut. The male mold positioning sleeve places the pre-embedded nut into the upper product cavity. The female mold positioning rod has a blind hole in the pre-embedded nut, and one end of the female mold positioning rod is engaged with the blind hole. A male mold core is located inside the hollow cavity, with one end of the male mold core abutting against a pre-embedded nut; The male mold positioning sleeve and the female mold positioning rod are arranged coaxially with each other and have axial reciprocating freedom relative to the male mold core; When one end of the female mold positioning rod engages with the blind hole, the male mold positioning sleeve exits from the upper product cavity and peels off from the pre-embedded nut. Molten plastic is then injected into the upper product cavity to wrap around the pre-embedded nut. The male mold core has a boss that abuts against a pre-embedded nut, and the diameter of the boss is smaller than the inner diameter of the hollow cavity; The female mold positioning rod is arranged above the male mold positioning sleeve, and both the female mold positioning rod and the male mold positioning sleeve are arranged vertically; the root of the boss is at the same horizontal plane as the bottom surface of the upper product cavity, and when the male mold positioning sleeve moves to the extreme position away from the female mold positioning rod, the top of the male mold positioning sleeve is also at the same horizontal plane as the bottom surface of the upper product cavity.

2. The positioning mechanism for the embedded blind hole nut product according to claim 1, characterized in that: The outer circumferential surface of the pre-embedded nut has several circumferential grooves, and molten plastic is also injected into the circumferential grooves.

3. The positioning mechanism for the embedded blind hole nut product according to claim 1, characterized in that: The bottom of the blind hole has a conical cavity that is not filled by the positioning rod of the master mold.

4. The positioning mechanism for the embedded blind hole nut product according to claim 1, characterized in that: The positioning rod of the master mold includes a lower insertion section and a thickened section. The outer diameter of the lower insertion section is smaller than the outer diameter of the thickened section. The lower insertion section and the thickened section are connected by a vertical annular stepped surface. The lower insertion section mates with a blind hole.

5. The positioning mechanism for the embedded blind hole nut product according to claim 4, characterized in that: The top opening of the upper product cavity is provided with a washer. When the female mold positioning rod moves to the limit position to cooperate with the pre-embedded nut, the annular stepped surface contacts the shaft end of the pre-embedded nut, and the inner ring of the washer cooperates with the thickened section of the female mold positioning rod.

6. The positioning mechanism for the embedded blind hole nut product according to claim 1, characterized in that: The male mold positioning sleeve is provided with a male mold core, and a male mold pad is provided below the male mold core. The bottom surface of the male mold core itself forms a lower cavity. The bottom of the lower cavity is connected to the upper product cavity through a vertical cavity. The male mold positioning sleeve is movably disposed in the vertical cavity. The lower cavity is provided with a lower ejector plate and an upper ejector plate that are fixed to each other. The lower ejector plate and the upper ejector plate are fixed to the bottom of the male mold positioning sleeve. The lower ejector plate and the upper ejector plate can move vertically up and down within the lower cavity.

7. The positioning mechanism for the embedded blind hole nut product according to claim 6, characterized in that: The male mold core is also provided with a vertical channel parallel to the vertical cavity. A movable male mold return pin is provided in the vertical channel. The bottom of the male mold positioning sleeve, the bottom of the male mold return pin, the bottom of the male mold core, and the top of the female mold positioning rod are all provided with an integral radially outward expanding radial flange. The bottom of the male mold positioning sleeve and the bottom of the male mold return pin are clamped by the lower ejector plate and the upper ejector plate, and the lower ejector plate and the upper ejector plate are fixed together by screws; the bottom of the male mold core is fixed to the male mold pad. The top surface of the mold pad has a limiting recess, and a floating spring is provided in the limiting recess. The floating spring applies an upward elastic force to the lower ejector plate.

8. The embedded nut process is characterized by: The positioning mechanism for the embedded blind hole nut product as described in any one of claims 1 to 7 includes: Step 1: The male mold positioning sleeve and the female mold positioning rod are both located at their highest extreme positions. Step 2: The pre-embedded nut is inserted into the hollow cavity of the male mold positioning sleeve, with the top of the pre-embedded nut higher than the top of the male mold positioning sleeve, and the pre-embedded nut is located in the upper product cavity; Step 3: The female mold positioning rod descends and assembles with the blind hole of the pre-embedded nut. When the female mold positioning rod descends to its lowest limit position, the male mold positioning sleeve starts and descends to its lowest limit position. Step 4: Once the mold is closed, molten plastic is injected into the upper product cavity to enclose the pre-embedded nut. Step 5: The molten plastic solidifies and forms an injection molded part. The male mold positioning sleeve and the female mold positioning rod rise synchronously and at the same speed, and the injection molded part separates from the inner wall of the upper product cavity. Step six: After the male mold positioning sleeve moves to its highest limit position, the female mold positioning rod continues to rise until the vertical distance from the female mold positioning rod to the male mold positioning sleeve is greater than the height of the injection molded part. Step 7: Remove the pre-embedded nut containing the injection molded part from the positioning rod of the master mold; return to step 1 and begin the next cycle.

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