Precise manufacturing mold for producing multi-step connector

Abstract

The invention belongs to the technical field of molds, in particular to a precision manufacturing mold for multi-step connector production, and provides the following scheme that the precision manufacturing mold specifically comprises a mold support, a transverse frame of an L-shaped structure is arranged at the top of the mold support, a thrust oil cylinder is installed at the end of the transverse frame, and rotating motors are installed at the two ends of the side face of the mold support correspondingly; and a fixing base of a U-shaped structure is installed between output shafts of the two rotating motors, and a first mold base is installed in the fixing base. Compressed air is used for blowing out an injection molding part, the outer surface of the injection molding part is evenly stressed, damage caused by local stress of the injection molding part is avoided, in the air blowing process, a rotating motor drives a fixing base to incline downwards, meanwhile, a second mold base and a third mold base move forwards to be matched with the compressed air to strip the injection molding part from a forming mold cavity, and the injection molding part is stripped. The demolding efficiency is improved, and scratches are prevented from being formed on the surface of an injection molding part.

Description

Technical Field

[0001] The invention relates to the technical field of molds, and in particular to a precision manufacturing mold for producing multi-step connectors. Background Art

[0002] Connectors generally refer to electrical connectors, which are devices that connect two active devices and transmit current or signals. In the assembly of electronic and electrical products, cable connectors are widely used. They are key products to ensure the correctness and reliability of electrical signal transmission. There are many types of cable connectors, mainly low-frequency, high-frequency, round, rectangular, etc.

[0003] The connector shell is mostly processed by injection molding. The material is injected into the mold, and then the blank is made into a multi-step connector shell with a specific shape and size under the action of external force. Then the demolding operation is performed to remove the injection molded part from the mold after cooling and fixing. The traditional demolding method is to use a cylinder to push the ejector pin, and use the ejector pin to apply a large force to one side of the injection molded part formed in the mold cavity to lift the injection molded part at one time. The internal shell finished product is easily deformed and damaged due to local force, or dents are formed on the surface, affecting the appearance quality.

[0004] In view of this, the present invention provides a precision manufacturing mold for the production of multi-step connectors to solve the technical problems existing in the above-mentioned prior art. Summary of the invention

[0005] Based on the technical problems existing in the background technology, the present invention proposes a precision manufacturing mold for the production of multi-step connectors.

[0006] The present invention proposes a precision manufacturing mold for the production of multi-step connectors, comprising a mold bracket, a cross frame of an L-shaped structure is installed on the top of the mold bracket, and a propulsion cylinder is installed at the end of the cross frame, rotating motors are installed at both ends of the side of the mold bracket, and a fixed seat of a U-shaped structure is installed between the output shafts of the two rotating motors, a first mold base is installed inside the fixed seat, and a second mold base, a third mold base and a fourth mold base are installed in sequence at the front end of the first mold base, a driving cylinder for driving the second mold base and the third mold base to move forward and backward is installed on the top and bottom of the fixed seat, and a rotating cylinder is installed between the fourth mold base and the propulsion cylinder. A support frame is provided, a plurality of first mold cavities are arranged on the side of the first mold base, a plurality of penetrating second mold cavities are arranged in the middle of the second mold base, a plurality of penetrating third mold cavities are arranged in the middle of the third mold base, and a guide bar matched with the fourth mold base is arranged at the front end of the third mold base, a plurality of convex modules inserted into the first mold cavity, the second mold cavity and the third mold cavity are arranged on the side of the fourth mold base, a molding cavity is formed between the first mold cavity, the second mold cavity, the third mold cavity and the convex modules, two injection tubes connected with the molding cavity are arranged at the front end of the fourth mold base, and a ventilation mechanism connected with the molding cavity is installed at the rear end of the first mold base.

[0007] Preferably in the present invention, the first mold base includes a main mold plate, and the rear end of the main mold plate is provided with two ventilation holes that slide with the ventilation mechanism, and the two ventilation holes are connected to the tail end of the first mold cavity, and the apertures of the ventilation holes are distributed in a stepped manner.

[0008] Preferably in the present invention, a front end of the main template is provided with a plurality of guide grooves connected to the first mold cavity, and a through exhaust groove is provided between the tail ends of the plurality of guide grooves.

[0009] Preferably in the present invention, the ventilation mechanism includes an exhaust pipe and an air blowing pipe, and the sides of the exhaust pipe and the air blowing pipe are connected to the ventilation perforations through pipes, and a plurality of blocking components inserted into the ventilation perforations are installed in the middle of the exhaust pipe and the air blowing pipe.

[0010] Preferably in the present invention, the blocking assembly includes an electric telescopic rod installed on the exhaust pipe or the air blowing pipe, and a blocking rod inserted into the ventilation perforation, and the front end of the blocking rod is provided with a protrusion that blocks the ventilation perforation and the first mold cavity, and the rear end of the blocking rod is installed on the electric telescopic rod.

[0011] Preferably in the present invention, the fourth mold base includes an insulation cavity sleeved on the outside of the injection molding tube, and a guide protrusion arranged at the front end of the convex module, a circulation channel connecting the two injection molding tubes is arranged in the middle of the convex module, and the top and bottom of the circulation channel are provided with injection holes connected to the molding cavity, and a telescopic component for opening and closing the injection molding hole is arranged in the fourth mold base.

[0012] Preferably in the present invention, the telescopic assembly includes a push rod motor installed in the insulation cavity, and a U-shaped telescopic part inserted into the interior of the convex module, and the outer end of the U-shaped telescopic part is installed on the push rod motor, and the inner end of the U-shaped telescopic part is provided with an opening and closing part that cooperates with the injection hole.

[0013] Preferably in the present invention, a heating heater is provided in both the heat preservation cavity and the convex module, and a solenoid valve is provided between the circulation channels of the injection molding tube.

[0014] Preferably in the present invention, a plurality of guide slide bars are arranged at the front end of the first die base, and guide slide holes matching the guide slide bars are arranged on the outer sides of the second die base, the third die base and the fourth die base, and a plurality of buffer springs are sleeved on the outer sides of the guide slide bars.

[0015] Preferably in the present invention, two cooling channels are provided in the middle of each of the first die base, the second die base and the third die base, and joints for connecting cooling water are provided at the ends of the cooling channels.

[0016] Compared with the prior art, the present invention provides a precision manufacturing mold for the production of multi-step connectors, which has the following beneficial effects: In the present invention, a first die base, a second die base, a third die base and a fourth die base are stacked in multiple layers, and a convex module is inserted into the first die cavity, the second die cavity and the third die cavity to form a molding die cavity, and the second die base and the third die base can be moved forward by a driving cylinder, and the fourth die base is installed on the propulsion cylinder. During the manufacturing process of the shell of the multi-step connector, after the first die base, the second die base and the third die base are tightly fixed, the fourth die base is inserted into the third die base under the push of the propulsion cylinder to form a molding die cavity, and the ventilation mechanism is activated to extract the air inside the molding die cavity to a vacuum state, and then the channel between the ventilation mechanism and the molding die cavity is closed, and the molten material circulates in the fourth die base through two injection tubes. The fourth die base opens the channel for the molten material to enter the molding die cavity, and the molten material quickly fills the mold cavity. The molding cavity, the vacuum environment inside the molding cavity quickly absorbs the molten material, speeds up the injection molding process, and effectively avoids defects such as bubbles on the surface of the injection molded part. Then, the channel for the molten material to enter the molding cavity is closed. After the injection molded part is solidified and molded, the fourth mold base is away from the third mold base, and the ventilation mechanism performs an inflation action. Compressed air is introduced between the injection molded part and the molding cavity. The compressed air destroys the vacuum environment between the injection molded part and the molding cavity, and the injection molded part is blown out by the compressed air. The outer surface of the injection molded part is evenly stressed to avoid damage to the injection molded part due to local stress. In the inflation process, the rotating motor drives the fixed seat to tilt downward. At the same time, the second mold base and the third mold base move forward, and cooperate with the compressed air to peel the injection molded part from the molding cavity, thereby accelerating the demoulding efficiency and avoiding scratches on the surface of the injection molded part. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1This is a schematic structural diagram of a precision manufacturing mold for producing multi-step connectors proposed by the present invention; Figure 2 This is a schematic diagram of the distribution of the second die base and the third die base of a precision manufacturing die for producing multi-step connectors proposed by the present invention; Figure 3 A schematic diagram of the first die base distribution structure of a precision manufacturing die for producing multi-step connectors proposed by the present invention; Figure 4 A schematic diagram of the fourth die base structure of a precision manufacturing die for producing multi-step connectors proposed by the present invention; Figure 5 A schematic diagram of the second die base structure of a precision manufacturing die for producing multi-step connectors proposed by the present invention; Figure 6 A schematic diagram of the third die base structure of a precision manufacturing die for producing multi-step connectors proposed by the present invention; Figure 7 A schematic diagram of the distribution structure of a ventilation mechanism of a precision manufacturing mold for producing multi-step connectors proposed by the present invention; Figure 8 A partial cross-sectional structural schematic diagram of a precision manufacturing mold for producing multi-step connectors proposed by the present invention; Fig. 9 A schematic diagram of the fourth die base structure of a precision manufacturing die for producing multi-step connectors proposed by the present invention; Fig.10 This is a schematic diagram of the first mold base structure of a precision manufacturing mold for producing multi-step connectors proposed by the present invention.

[0018] In the figure: 1 mold support, 2 rotating motor, 3 fixed base, 4 driving cylinder, 5 second mold base, 51 second mold cavity, 6 third mold base, 61 guide strip, 62 third mold cavity, 7 support frame, 8 propulsion cylinder, 9 fourth mold base, 91 insulation cavity, 92 heating heater, 93 convex module, 94 guide protrusion, 95 injection hole, 96 push rod motor, 97 U-shaped telescopic part, 98 circulation channel, 10 first mold base, 101 main template, 102 first mold cavity, 103 guide groove, 104 exhaust groove, 105 ventilation perforation, 11 ventilation mechanism, 111 exhaust pipe, 112 air blowing pipe, 113 electric telescopic rod, 114 blocking rod, 12 joint, 13 buffer spring, 14 guide slide bar, 15 injection pipe, 16 molding mold cavity, 17 cooling channel. DETAILED DESCRIPTION

[0019] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0020] Reference Figure 1-10 A precision manufacturing mold for the production of multi-step connectors, comprising a mold bracket 1, a cross frame of an L-shaped structure is installed on the top of the mold bracket 1, and a propulsion cylinder 8 is installed at the end of the cross frame, a rotating motor 2 is installed at both ends of the side of the mold bracket 1, and a fixed seat 3 of a U-shaped structure is installed between the output shafts of the two rotating motors 2, a first mold base 10 is installed inside the fixed seat 3, and a second mold base 5, a third mold base 6 and a fourth mold base 9 are installed in sequence at the front end of the first mold base 10, a driving cylinder 4 for driving the second mold base 5 and the third mold base 6 to move forward and backward is installed on the top and bottom of the fixed seat 3, a support frame 7 is installed between the fourth mold base 9 and the propulsion cylinder 8, and the side of the first mold base 10 A plurality of first mold cavities 102 are provided, a plurality of penetrating second mold cavities 51 are provided in the middle of the second mold base 5, a plurality of penetrating third mold cavities 62 are provided in the middle of the third mold base 6, and a guide bar 61 matching with the fourth mold base 9 is provided at the front end of the third mold base 6, a plurality of convex modules 93 inserted into the first mold cavity 102, the second mold cavity 51 and the third mold cavity 62 are provided on the side of the fourth mold base 9, a molding cavity 16 is formed between the first mold cavity 102, the second mold cavity 51, the third mold cavity 62 and the convex modules 93, two injection tubes 15 connected with the molding cavity 16 are provided at the front end of the fourth mold base 9, and a ventilation mechanism 11 connected with the molding cavity 16 is installed at the rear end of the first mold base 10.

[0021] In the present invention, a first die base 10, a second die base 5, a third die base 6 and a fourth die base 9 are provided with a plurality of stacked layers, and a convex module 93 is inserted into the first cavity 102, the second cavity 51 and the third cavity 62 to form a molding cavity 16, and the second die base 5 and the third die base 6 can be moved forward by driving the oil cylinder 4, and the fourth die base 9 is installed on the propulsion oil cylinder 8. During the manufacturing process of the shell of the multi-step connector, after the first die base 10, the second die base 5 and the third die base 6 are tightly fixed, the fourth die base 9 is inserted into the third die base 6 under the push of the propulsion oil cylinder 8 to form the molding cavity 16, and then the ventilation mechanism 11 is actuated to extract the air inside the molding cavity 16 to a vacuum state, and then the channel between the ventilation mechanism 11 and the molding cavity 16 is closed, and the molten material circulates in the fourth die base 9 through the two injection tubes 15, and the fourth die base 9 opens the molten material to enter the molding cavity 16. The channel of the molten material quickly fills the molding cavity 16, and the vacuum environment inside the molding cavity 16 quickly absorbs the molten material, which speeds up the injection molding process and effectively avoids defects such as bubbles on the surface of the injection molded part. Then, the channel for the molten material to enter the molding cavity 16 is closed. After the injection molded part is solidified, the fourth mold base 9 is away from the third mold base 6, and the ventilation mechanism 11 performs an inflation action. Compressed air is introduced between the injection molded part and the molding cavity 16. The compressed air destroys the vacuum environment between the injection molded part and the molding cavity 16, and the injection molded part is blown out by the compressed air. The outer surface of the injection molded part is uniformly stressed to avoid damage caused by local stress on the injection molded part. In the inflation process, the rotating motor 2 drives the fixed seat 3 to tilt downward. At the same time, the second mold base 5 and the third mold base 6 move forward to cooperate with the compressed air to peel the injection molded part from the molding cavity 16, thereby accelerating the demoulding efficiency and avoiding scratches on the surface of the injection molded part.

[0022] As a further solution in the present invention, the first mold base 10 includes a main template 101, and the rear end of the main template 101 is provided with two ventilation holes 105 that slide with the ventilation mechanism 11, and the two ventilation holes 105 are connected to the tail end of the first mold cavity 102, and the apertures of the ventilation holes 105 are distributed in a stepped manner. In the present invention, after the molding cavity 16 is formed, the air in the molding cavity 16 is extracted through the ventilation holes 105 on one side. After the injection molded part is molded, ventilation is allowed between the molding cavity 16 and the injection molded part through the ventilation holes 105 on the other side to accelerate the demolding process of the injection molded part.

[0023] As a further solution in the present invention, the front end of the main template 101 is provided with a plurality of guide grooves 103 connected to the first mold cavity 102, and a through exhaust groove 104 is provided between the tail ends of the plurality of guide grooves 103. In the present invention, when the convex module 93 is inserted, the guide groove 103 cooperates with the front end of the convex module 93, and relies on the exhaust groove 104 that penetrates the guide groove 103 to quickly exhaust the air in the molding cavity 16, thereby accelerating the mold closing process.

[0024] As a further solution in the present invention, the ventilation mechanism 11 includes an exhaust pipe 111 and an air blowing pipe 112, and the sides of the exhaust pipe 111 and the air blowing pipe 112 are connected to the ventilation perforation 105 through pipes, and a plurality of blocking components inserted into the ventilation perforation 105 are installed in the middle of the exhaust pipe 111 and the air blowing pipe 112. In the present invention, the ends of the exhaust pipe 111 and the air blowing pipe 112 are connected to the vacuum pump and the air blowing pump in turn, and rely on the blocking components inserted into the ventilation perforation 105 to realize the vacuum treatment inside the molding cavity 16 and the blowing operation between the molding cavity 16 and the injection molded part, thereby accelerating the demolding process.

[0025] As a further solution in the present invention, the blocking component includes an electric telescopic rod 113 installed on the exhaust pipe 111 or the air blowing pipe 112, and a blocking rod 114 inserted into the ventilation perforation 105, and the front end of the blocking rod 114 is provided with a protrusion blocking the ventilation perforation 105 and the first mold cavity 102, and the rear end of the blocking rod 114 is installed on the electric telescopic rod 113. In the present invention, when the blocking rod 114 moves forward, the protrusion blocks the ventilation perforation 105 and the first mold cavity 102, and when the blocking rod 114 moves backward, the protrusion is separated from the front end of the ventilation perforation 105, so that the operation of exhausting or blowing air into the molding cavity 16 can be realized. Each molding cavity 16 is exhausted or blown independently to avoid the occurrence of inconsistent demolding.

[0026] As a further solution in the present invention, the fourth mold base 9 includes an insulation cavity 91 sleeved on the outside of the injection molding tube 15, and a guide protrusion 94 arranged at the front end of the convex module 93, a circulation channel 98 connecting the two injection molding tubes 15 is arranged in the middle of the convex module 93, and the top and bottom of the circulation channel 98 are both provided with injection holes 95 connected to the molding cavity 16, and a telescopic component for opening and closing the injection hole 95 is arranged in the fourth mold base 9. In the present invention, the material in a fluid state circulates through the two injection molding tubes 15. During the injection molding process, the telescopic component opens the injection hole 95 connecting the circulation channel 98 and the molding cavity 16, and the molten material is quickly sucked into the molding cavity 16 in a vacuum state, thereby accelerating the injection molding process. After the injection molding is completed, the telescopic component closes the injection hole 95, isolating the circulation channel 98 and the molding cavity 16 to prevent material backflow.

[0027] As a further solution in the present invention, the telescopic assembly includes a push rod motor 96 installed in the insulation chamber 91, and a U-shaped telescopic member 97 inserted into the convex module 93, and the outer end of the U-shaped telescopic member 97 is installed on the push rod motor 96, and the inner end of the U-shaped telescopic member 97 is provided with an opening and closing portion that cooperates with the injection hole 95. In the present invention, after the injection molding is completed, the U-shaped telescopic member 97 moves inward, squeezes the molten material inside the injection hole 95, blocks the material flow channel, and squeezes the remaining material into the molding cavity 16, empties the material inside the injection hole 95, avoids material backflow, and at the same time, reduces the risk of clogging the injection hole 95.

[0028] As a further solution in the present invention, a heating heater 92 is provided in the insulation cavity 91 and the convex module 93, and a solenoid valve is provided between the circulation channel 98 of the injection tube 15. In the present invention, after the injection molding is completed, the solenoid valve between the circulation channel 98 of the injection tube 15 is closed to accelerate the curing molding of the injection molding machine. When demolding, the heating heater 92 in the convex module 93 is turned on, and the solenoid valve is opened to allow the molten material to circulate in the circulation channel 98 to reduce the risk of blockage.

[0029] As a further solution in the present invention, a plurality of guide slide rods 14 are arranged at the front end of the first mold base 10, and guide slide holes matched with the guide slide rods 14 are arranged on the outer sides of the second mold base 5, the third mold base 6 and the fourth mold base 9, and a plurality of buffer springs 13 are sleeved on the outer sides of the guide slide rods 14. In the present invention, the second mold base 5, the third mold base 6 and the fourth mold base 9 are arranged with the guide slide rods 14 during the mold closing process to avoid the occurrence of misalignment, and the buffer springs 13 are arranged to ensure that the force on all sides is uniform during the mold closing to avoid damage to the mold.

[0030] As a further solution in the present invention, two cooling channels 17 are provided in the middle of the first mold base 10, the second mold base 5 and the third mold base 6, and the ends of the cooling channels 17 are provided with joints 12 connected to cooling water. In the present invention, after injection molding in the molding cavity 16 is completed, a cooling water circulation is constructed in the cooling channel 17 to drive the heat in the middle of the molding cavity 16 and accelerate the curing efficiency of the injection molding machine.

[0031] When in use, the convex module 93 is inserted into the first mold cavity 102, the second mold cavity 51 and the third mold cavity 62 to form a molding cavity 16, and the second mold base 5 and the third mold base 6 can be moved forward by driving the cylinder 4, and the fourth mold base 9 is installed on the thrust cylinder 8. During the manufacturing process of the shell of the multi-step connector, after the first mold base 10, the second mold base 5 and the third mold base 6 are tightly fixed, the fourth mold base 9 is inserted into the third mold base 6 under the push of the thrust cylinder 8 to form the molding cavity 16. After that, the ventilation mechanism 11 is activated to extract the air inside the molding cavity 16 to a vacuum state, and then the channel between the ventilation mechanism 11 and the molding cavity 16 is closed, and the molten material circulates in the fourth mold base 9 through the two injection tubes 15. The fourth mold base 9 opens the channel for the molten material to enter the molding cavity 16, and the molten material quickly The molding cavity 16 is filled with the vacuum environment inside the molding cavity 16 to quickly absorb the molten material, thereby accelerating the injection molding process and effectively avoiding defects such as bubbles on the surface of the injection molded part. Then, the channel for the molten material to enter the molding cavity 16 is closed. After the injection molded part is solidified and molded, the fourth mold base 9 is away from the third mold base 6, and the ventilation mechanism 11 performs an inflation action, and compressed air is introduced between the injection molded part and the molding cavity 16. The compressed air destroys the vacuum environment between the injection molded part and the molding cavity 16, and the injection molded part is blown out by the compressed air. The outer surface of the injection molded part is evenly stressed to avoid damage to the injection molded part due to local stress. In the inflation process, the rotating motor 2 drives the fixed seat 3 to tilt downward. At the same time, the second mold base 5 and the third mold base 6 move forward, and cooperate with the compressed air to peel the injection molded part from the molding cavity 16 to accelerate the demoulding efficiency.

[0032] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A precision manufacturing mold for producing multi-step connectors, comprising a mold support (1), wherein a cross frame of an L-shaped structure is installed on the top of the mold support (1), and a propulsion cylinder (8) is installed at the end of the cross frame, and rotating motors (2) are installed at both ends of the side of the mold support (1), and a U-shaped fixing seat (3) is installed between the output shafts of the two rotating motors (2), characterized in that: A first die base (10) is installed inside the fixed base (3), and a second die base (5), a third die base (6) and a fourth die base (9) are installed in sequence at the front end of the first die base (10); a driving cylinder (4) for driving the second die base (5) and the third die base (6) to move forward and backward is installed at the top and bottom of the fixed base (3); a support frame (7) is installed between the fourth die base (9) and the propulsion cylinder (8); a plurality of first die cavities (102) are arranged on the side of the first die base (10); a plurality of penetrating second die cavities (51) are arranged in the middle of the second die base (5); a plurality of penetrating third die cavities (52) are arranged in the middle of the third die base (6); The third mold base (6) is provided with a guide bar (61) matched with the fourth mold base (9) at the front end thereof, a plurality of convex modules (93) inserted into the first mold cavity (102), the second mold cavity (51) and the third mold cavity (62) are provided on the side of the fourth mold base (9), the first mold cavity (102), the second mold cavity (51), the third mold cavity (62) and the convex modules (93) form a molding mold cavity (16), the front end of the fourth mold base (9) is provided with two injection tubes (15) connected with the molding mold cavity (16), and the rear end of the first mold base (10) is provided with a ventilation mechanism (11) connected with the molding mold cavity (16).

2. A precision manufacturing mold for multi-step connector production according to claim 1, characterized in that: The first mold base (10) comprises a main mold plate (101), and the rear end of the main mold plate (101) is provided with two ventilation holes (105) that are slidably matched with the ventilation mechanism (11), and the two ventilation holes (105) are connected to the rear end of the first mold cavity (102), and the apertures of the ventilation holes (105) are distributed in a stepped manner.

3. A precision manufacturing mold for multi-step connector production according to claim 2, characterized in that: The front end of the main mold plate (101) is provided with a plurality of guide grooves (103) connected to the first mold cavity (102), and a through-going exhaust groove (104) is provided between the rear ends of the plurality of guide grooves (103).

4. A precision manufacturing mold for multi-step connector production according to claim 3, characterized in that: The ventilation mechanism (11) comprises an air extraction pipe (111) and an air blowing pipe (112), and the sides of the air extraction pipe (111) and the air blowing pipe (112) are connected to the ventilation perforations (105) via pipes, and a plurality of blocking components inserted into the ventilation perforations (105) are installed in the middle of the air extraction pipe (111) and the air blowing pipe (112).

5. A precision manufacturing mold for producing multi-step connectors according to claim 4, characterized in that: The blocking assembly comprises an electric telescopic rod (113) mounted on the exhaust pipe (111) or the air blowing pipe (112), and a blocking rod (114) inserted into the ventilation hole (105), wherein the front end of the blocking rod (114) is provided with a protrusion for sealing the ventilation hole (105) and the first mold cavity (102), and the rear end of the blocking rod (114) is mounted on the electric telescopic rod (113).

6. A precision manufacturing mold for multi-step connector production according to claim 1, characterized in that: The fourth mold base (9) comprises a heat preservation cavity (91) sleeved on the outside of the injection tube (15), and a guide protrusion (94) arranged at the front end of the male module (93); a circulation channel (98) connecting the two injection tubes (15) is arranged in the middle of the male module (93), and injection holes (95) connected to the molding cavity (16) are arranged at the top and bottom of the circulation channel (98); and a telescopic component for opening and closing the injection hole (95) is arranged in the fourth mold base (9).

7. A precision manufacturing mold for producing multi-step connectors according to claim 6, characterized in that: The telescopic assembly comprises a push rod motor (96) installed in the heat preservation chamber (91), and a U-shaped telescopic member (97) inserted into the interior of the convex module (93), wherein the outer end of the U-shaped telescopic member (97) is installed on the push rod motor (96), and the inner end of the U-shaped telescopic member (97) is provided with an opening and closing portion that cooperates with the injection hole (95).

8. A precision manufacturing mold for producing multi-step connectors according to claim 7, characterized in that: A heat tracing heater (92) is provided in both the heat preservation cavity (91) and the male module (93), and a solenoid valve is provided between the circulation flow channel (98) of the injection molding tube (15).

9. A precision manufacturing mold for producing multi-step connectors according to claim 1, characterized in that: A plurality of guide slide bars (14) are arranged at the front end of the first die base (10), and guide slide holes matching the guide slide bars (14) are arranged on the outer sides of the second die base (5), the third die base (6) and the fourth die base (9), and a plurality of buffer springs (13) are sleeved on the outer sides of the guide slide bars (14).

10. A precision manufacturing mold for producing multi-step connectors according to claim 1, characterized in that: Two cooling channels (17) are provided in the middle of each of the first die base (10), the second die base (5) and the third die base (6), and joints (12) for connecting cooling water are provided at the ends of the cooling channels (17).

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