A precision injection mold for structural parts

Abstract

The utility model relates to the technical field of injection molds, specifically a precision injection mold for structural parts, including a base, a frame fixedly mounted on the upper surface of the base, a cylinder fixedly embedded and mounted on the upper surface of the frame, a bottom mold assembly fixedly mounted on the upper surface of the base, the bottom mold assembly including a bottom mold fixedly mounted on the upper surface of the base, positioning holes symmetrically opened on the upper surface of the bottom mold penetrating the bottom mold, a mounting plate fixedly mounted on the lower end of the cylinder, and a top mold assembly fixedly mounted on the lower surface of the mounting plate. In the utility model, by arranging the air holes and the receiving grooves in one place, the area occupied in the mold cavity is reduced, the area of ​​burrs formed on the surface of the injection molded part at the edges of the air holes and the receiving grooves is reduced, the injection quality of the injection molded part is improved, and when the upper mold moves, the push plate is first moved down and then moved up, so that the air first enters the mold cavity, and then the injection molded part is moved out by the push plate, thereby reducing the risk of adhesion and damage to the injection molded part caused by the continuous upward movement of the push plate.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to an injection mold for a precision injection molded structural part. Background Art

[0002] When performing injection molding preparation operations for precision structural parts, the corresponding rapid injection molding mold is required. The injection mold is a tool for producing plastic products, and it is also a tool for giving plastic products a complete structure and precise dimensions. Injection molding is a processing method used in mass production of certain parts with complex shapes. Specifically, it refers to the high-pressure injection of heated and melted plastic into the mold cavity by an injection molding machine, and after cooling and solidification, a molded product is obtained.

[0003] The announcement number is: CN220517424U, which discloses "an injection mold for precision structural parts of electronic products, belonging to the technical field of injection molds for precision parts, including a mold base, a bottom mold, a connecting frame, a hydraulic pump and a die, a mold cavity is opened on the top of the bottom mold, an inner groove body is provided inside the mold base near the bottom of the bottom mold, and a shift plate is provided inside the inner groove body for upward and downward movement, a pressure port is opened through the opposite sides of the top of the bottom mold near the opening of the mold cavity, a pressure plate is fixedly connected to the position of the bottom of the die relative to the pressure port, and the pressure plate is adapted to be plugged into the pressure port, and a spring is fixedly connected between the bottom of the shift plate and the inner groove wall at the bottom of the mold base";

[0004] There are still certain disadvantages in use. By spraying air, a gap is created between the precision part and the mold cavity. Then the spring rebounds to push the push plate to demold the injection molded precision part. The air holes and the slots occupy a large area in the mold cavity. Flash is easily formed on the surface of the injection molded part at the edges of the air holes and the slots, resulting in a decrease in the injection quality of the injection molded parts. Before spraying air, the die needs to be moved up to ensure that the injection molded parts have space to move. After the die is moved up, the push plate will be moved up directly, and there is still a risk of pulling damage caused by adhesion of the injection molded parts. Utility Model Content

[0005] The purpose of the utility model is to provide an injection mold for a precision injection molded structural part to solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A precision injection molded structural part injection mold comprises a base, a frame is fixedly mounted on the upper surface of the base, a cylinder is fixedly embedded and mounted on the upper surface of the frame, a bottom mold assembly is fixedly mounted on the upper surface of the base, the bottom mold assembly comprises a bottom mold fixedly mounted on the upper surface of the base, positioning holes penetrating the bottom mold are symmetrically provided on the upper surface of the bottom mold, a mounting plate is fixedly mounted on the lower end of the cylinder, a top mold assembly is fixedly mounted on the lower surface of the mounting plate, a positioning rod is fixedly mounted on the lower surface of the top mold, a mounting groove is provided on the upper surface of the base, a discharge assembly is movably provided inside the mounting groove, the discharge assembly comprises a connecting plate, push plates are symmetrically fixedly mounted on the upper surface of the connecting plate, and a No. 1 spring is movably sleeved on the outer side of the push plate.

[0008] Furthermore, a slot is provided on the lower surface of the positioning rod, a block is movably provided inside the slot, a push rod is fixedly installed on the lower surface of the block, a connecting slot is provided on the outer surface of the positioning rod, a bolt is movably inserted inside the connecting slot, the bolt passes through the block, and is screwed together with the block.

[0009] Preferably: a step groove is provided on the lower surface of the push rod, a piston rod is slidably connected inside the step groove, a No. 2 spring is provided on the outer movable sleeve of the piston rod, an air chamber is provided on the inner surface of one end of the step groove, a plane groove is provided on the outer surface of the push rod, and one end of the air chamber is connected to the plane groove.

[0010] Furthermore, a receiving groove penetrating the bottom mold is provided on the inner lower surface of the bottom mold, the push plate penetrates the adjacent receiving grooves and is slidably connected to the receiving grooves, and the two ends of the No. 1 spring are fixedly connected to the bottom mold and the connecting plate respectively.

[0011] Preferably, an air groove is provided on the inner surface of the receiving groove, an air channel is provided on the inner side surface of the air groove, and one end of the air channel passes through the lower surface of the bottom mold.

[0012] Preferably: a three-way pipe penetrating the bottom mold is fixedly provided inside the installation groove, one end of the three-way pipe penetrating the bottom mold is fixedly connected to an air pump, and the other two ends of the three-way pipe are fixedly installed with a No. 1 cannula, and the No. 1 cannula is movably engaged with the airway.

[0013] Preferably, a No. 2 insert is symmetrically and fixedly embedded on the outer surface of the three-way pipe.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] Through the operation of the air pump, after the injection molding is completed, air is pumped into the air bin and the air groove. At this time, the push plate blocks the air groove, and the air pushes the piston rod downward. At the same time, the top mold assembly moves upward, causing the push rod to move upward, and the top mold and the injection molded part are slightly separated. At this time, the No. 2 plug is still connected to the air bin, and the piston rod moves downward to push the connecting plate downward, so that the push plate moves downward, exposing the air groove, and air is pumped in from the upper end of the storage groove and blown between the bottom mold and the injection molded part to separate the two. When the No. 2 plug is no longer in contact with the air bin, the air pump stops running, and the No. 1 spring drives the connecting plate to move downward. The receiving plate and the push plate move up to eject the injection molded part, and the No. 2 spring pushes the piston rod to reset the piston rod for the next use. Thus, by arranging the air holes and the receiving grooves in one place, the area occupied in the mold cavity is reduced, and the area of ​​burrs formed on the surface of the injection molded part at the edges of the air holes and the receiving grooves is reduced, thereby improving the injection quality of the injection molded parts. When the top mold moves, the push plate moves down first and then up, so that the air first enters the mold cavity, and then the injection molded part is moved out by the push plate, thereby reducing the risk of adhesion and damage to the injection molded part caused by the continuous upward movement of the push plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a schematic diagram of the overall vertical section structure of the utility model;

[0018] Figure 3 It is a schematic diagram of the vertical cross-section structure of the discharge assembly and the bottom film part of the utility model;

[0019] Figure 4 It is a schematic diagram of the vertical cross-section structure of the positioning rod and the top rod in the utility model;

[0020] Figure 5 It is a schematic diagram of the overall structure of the air pump and the three-way pipe in the utility model.

[0021] In the figure: 1. base; 101. mounting groove; 102. frame; 103. cylinder; 104. mounting plate; 2. bottom mold assembly; 201. bottom mold; 202. positioning hole; 203. storage groove; 204. air groove; 205. air duct; 3. top mold assembly; 301. top mold; 302. positioning rod; 303. slot; 304. connecting groove; 305. bolt; 306. ejector rod; 307. block; 308. step groove; 309. plane groove; 4. discharge assembly; 401. connecting plate; 402. push plate; 403. spring No. 1; 404. three-way pipe; 405. insert No. 1; 406. insert No. 2; 407. air pump; 5. piston rod; 501. spring No. 2; 503. air chamber. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figures 1 to 5 In the embodiment of the utility model, a precision injection molding structural part injection mold comprises a base 1, a frame 102 is fixedly installed on the upper surface of the base 1, a cylinder 103 is fixedly embedded and installed on the upper surface of the frame 102, a bottom mold assembly 2 is fixedly installed on the upper surface of the base 1, the bottom mold assembly 2 comprises a bottom mold 201 fixedly installed on the upper surface of the base 1, and positioning holes 202 penetrating the bottom mold 201 are symmetrically opened on the upper surface of the bottom mold 201, a mounting plate 104 is fixedly installed on the lower end of the cylinder 103, a top mold assembly 3 is fixedly installed on the lower surface of the mounting plate 104, and the top mold assembly 3 comprises a top mold 301 fixedly installed on the lower surface of the mounting plate 104, and a positioning rod 302 is fixedly installed on the lower surface of the top mold 301, a mounting groove 101 is opened on the upper surface of the base 1, and a discharge assembly 4 is movably arranged inside the mounting groove 101, and the discharge assembly 4 comprises a connecting plate 401, and a push plate 402 is symmetrically fixedly installed on the upper surface of the connecting plate 401, and a No. 1 spring 403 is movably sleeved on the outer side of the push plate 402.

[0024] Specifically, by moving the top mold assembly 3 downward, the top rod 306 pushes the connecting plate 401 downward, and the push plate 402 is moved downward, so that the storage groove 203 is closed for injection molding, and then the air pump 407 is operated to pump the outside air into the air chamber 503, so that the piston rod 5 moves downward, the push plate 402 moves downward, and the air enters the bottom mold 201, separating the injection molded part from the bottom mold 201.

[0025] Embodiment 1

[0026] like Figure 3-4 As shown, in this embodiment, a slot 303 is provided on the lower surface of the positioning rod 302, a block 307 is movably provided inside the slot 303, a push rod 306 is fixedly installed on the lower surface of the block 307, a connecting slot 304 is provided on the outer surface of the positioning rod 302, a bolt 305 is movably inserted inside the connecting slot 304, the bolt 305 passes through the block 307, and is screwed together with the block 307; a receiving slot 203 passing through the bottom mold 201 is provided on the lower surface of the bottom mold 201, the push plate 402 passes through the adjacent receiving slot 203, and is slidably connected to the receiving slot 203, and the two ends of the No. 1 spring 403 are respectively fixedly connected to the bottom mold 201 and the connecting plate 401.

[0027] In this embodiment, for the sake of clarity of description, it is taken as an example that the two ends of spring No. 1 403 are fixedly connected to the bottom mold 201 and the connecting plate 401 respectively. Spring No. 1 403 itself has a contraction effect, which drives the connecting plate 401 to move upward, so that the push plate 402 always has an upward force, which is convenient for ejecting the injection molded part. The positioning rod 302 drives the push rod 306 to pass through the positioning hole 202, so that the push rod 306 is against the connecting plate 401, so that the connecting plate 401 drives the push plate 402 to move downward, and the storage groove 203 is blocked for injection molding. At this time, one end face of the No. 2 cannula 406 fits the plane groove 309, and is covered on the outside of the plane groove 309 at one end of the air chamber 503, and the No. 1 cannula 405 is inserted into the airway 205.

[0028] like Figure 2-5 As shown, in this embodiment, a stepped groove 308 is provided on the lower surface of the push rod 306, a piston rod 5 is slidably connected inside the stepped groove 308, a second spring 501 is movably sleeved outside the piston rod 5, an air chamber 503 is provided on one end surface of the stepped groove 308, a plane groove 309 is provided on the outer surface of the push rod 306, and one end of the air chamber 503 is connected to the plane groove 309; an air groove 204 is provided on the inner surface of the storage groove 203, and the inner surface of the air groove 204 is provided with a plurality of air chambers 503, and the inner surface of the air chamber 503 ... An airway 205 is opened, one end of which passes through the lower surface of the bottom mold 201; a three-way pipe 404 passing through the bottom mold 201 is fixedly arranged inside the installation groove 101, one end of the three-way pipe 404 passing through the bottom mold 201 is fixedly connected to an air pump 407, and the other two ends of the three-way pipe 404 are fixedly installed with a No. 1 cannula 405, and the No. 1 cannula 405 is movably engaged and connected with the airway 205; a No. 2 cannula 406 is symmetrically fixedly embedded on the outer surface of the three-way pipe 404.

[0029] During specific implementation, the air pump 407 is running to pump air into the air bin 503 and the air groove 204. At this time, the push plate 402 blocks the air groove 204, and the air pushes the piston rod 5 to move downward. At the same time, the top mold assembly 3 moves upward, causing the push rod 306 to move upward, and the top mold 301 is slightly separated from the injection molded part. At this time, the No. 2 insert 406 is still connected to the air bin 503, and the piston rod 5 moves downward to push the connecting plate 401 downward, causing the push plate 402 to move downward, exposing the air groove 204, and pumping air from the upper end of the storage groove 203 to blow between the bottom mold 201 and the injection molded part to separate the two. When the No. 2 insert 406 is no longer in contact with the air bin 503, the air pump 407 stops running. The first spring 403 drives the connecting plate 401 and the push plate 402 to move upward to eject the molded part, and the second spring 501 pushes the piston rod 5 to reset the piston rod 5 for the next use. Thus, by arranging the air hole and the receiving groove 203 in one place, the area occupied in the mold cavity is reduced, and the area of ​​burrs formed on the surface of the molded part at the edges of the air hole and the receiving groove 203 is reduced, thereby improving the injection quality of the molded part. When the top mold 301 moves, the push plate 402 moves downward first and then upward, so that the air first enters the mold cavity, and then the molded part is moved out by the push plate 402, thereby reducing the risk of adhesion and damage to the molded part caused by the continuous upward movement of the push plate 402.

[0030] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0031] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A precision injection mold for a structural part, comprising a base (1), a frame (102) fixedly mounted on the upper surface of the base (1), a cylinder (103) fixedly embedded in the upper surface of the frame (102), characterized in that: A bottom mold assembly (2) is fixedly mounted on the upper surface of the base (1), the bottom mold assembly (2) comprises a bottom mold (201) fixedly mounted on the upper surface of the base (1), a positioning hole (202) penetrating the bottom mold (201) is symmetrically provided on the upper surface of the bottom mold (201), a mounting plate (104) is fixedly mounted on the lower end of the cylinder (103), a top mold assembly (3) is fixedly mounted on the lower surface of the mounting plate (104), the top mold assembly (3) comprises a top mold (301) fixedly mounted on the lower surface of the mounting plate (104), a positioning rod (302) is fixedly mounted on the lower surface of the top mold (301), a mounting groove (101) is provided on the upper surface of the base (1), a discharging assembly (4) is movably provided inside the mounting groove (101), the discharging assembly (4) comprises a connecting plate (401), a push plate (402) is symmetrically fixedly mounted on the upper surface of the connecting plate (401), and a No. 1 spring (403) is movably sleeved on the outer side of the push plate (402).

2. The precision injection mold for structural parts according to claim 1, characterized in that: A slot (303) is provided on the lower surface of the positioning rod (302), a block (307) is movably provided inside the slot (303), a push rod (306) is fixedly installed on the lower surface of the block (307), a connecting slot (304) is provided on the outer surface of the positioning rod (302), a bolt (305) is movably inserted inside the connecting slot (304), and the bolt (305) passes through the block (307) and is screwed together with the block (307).

3. The precision injection mold for structural parts according to claim 2, characterized in that: A stepped groove (308) is provided on the lower surface of the push rod (306), a piston rod (5) is slidably connected inside the stepped groove (308), a second spring (501) is provided on the outer movable sleeve of the piston rod (5), an air chamber (503) is provided on the inner surface of one end of the stepped groove (308), a plane groove (309) is provided on the outer surface of the push rod (306), and one end of the air chamber (503) is connected to the plane groove (309).

4. The precision injection mold for structural parts according to claim 1, characterized in that: The bottom mold (201) has a receiving groove (203) penetrating the bottom mold (201) on its inner lower surface, and a push plate (402) penetrates adjacent receiving grooves (203) and is slidably connected to the receiving grooves (203), and two ends of a No. 1 spring (403) are fixedly connected to the bottom mold (201) and the connecting plate (401) respectively.

5. The precision injection mold for structural parts according to claim 4, characterized in that: An air groove (204) is provided on the inner surface of the receiving groove (203), an air channel (205) is provided on the inner surface of the air groove (204), and one end of the air channel (205) passes through the lower surface of the bottom mold (201).

6. The precision injection mold for structural parts according to claim 5, characterized in that: A three-way pipe (404) penetrating the bottom mold (201) is fixedly arranged inside the installation groove (101); one end of the three-way pipe (404) penetrating the bottom mold (201) is fixedly connected to an air pump (407); and a No. 1 cannula (405) is fixedly arranged at the other two ends of the three-way pipe (404); the No. 1 cannula (405) is movably engaged and connected to the airway (205).

7. The precision injection mold for structural parts according to claim 6, characterized in that: A second inserting tube (406) is symmetrically and fixedly embedded on the outer surface of the three-way pipe (404).

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