Positioning structure of rapid forming injection mold

Abstract

The utility model discloses a rapid forming injection mold positioning structure which comprises a rotating disc, a first lower mold base and a second lower mold base which are centrosymmetric are installed on the rotating disc, and an upper mold base used in cooperation with the first lower mold base and the second lower mold base is arranged above the rotating disc. Two positioning blocks are installed between the two sets of lower die bases on the rotating disc, the positioning blocks and the two sets of lower die bases are distributed in a 90-degree mode, the positioning blocks are provided with first taper holes which form a horizontal 90-degree angle with the lower die bases, the bottoms of the positioning blocks are provided with second taper holes which form a vertical 90-degree angle with the first taper holes, and a first guide positioning rod and a second guide positioning rod can be inserted into the first taper holes and the second taper holes respectively. The guide positioning rod I is connected with the output end of the hydraulic cylinder I, the guide positioning rod II is connected with the output end of the hydraulic cylinder II, and the hydraulic cylinders in two directions respectively push the corresponding guide positioning rods to be inserted into the conical holes of the corresponding positioning blocks, so that the positioning precision of a mold during mold closing is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to a positioning structure of an injection mold. Background Art

[0002] Nowadays, people use plastic products more and more widely, and the requirements for plastic products are getting higher and higher. Among them, injection molding is a commonly used plastic parts manufacturing method in many plastic molding processes. The positioning accuracy of mold closing will affect the quality of plastic parts molding.

[0003] Among the existing technologies, there is a rapid prototyping injection molding technology that includes two sets of molds for molding plastic parts. Both sets of molds are installed on an injection molding machine. During the injection molding process, after one injection molding is completed, the turntable on the injection molding machine will rotate 180 degrees, and then the other set of molds will be closed to complete another injection molding. Due to the processing errors and assembly errors in existing science and technology, positioning errors will occur when the molds are closed, resulting in unsatisfactory molded plastic parts, wear of mold parts, and reduced mold service life. Therefore, it is necessary to improve the positioning structure of the mold to produce qualified products and extend the service life of the mold. Utility Model Content

[0004] The utility model provides a rapid prototyping injection mold positioning structure, which is used to solve the problems in the background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A rapid prototyping injection mold positioning structure, comprising a turntable, on which two sets of centrally symmetrical first lower mold bases and second lower mold bases are mounted, and above the turntable, there is a set of upper mold bases used in conjunction with the first lower mold base and the second lower mold base;

[0007] Two positioning blocks are installed between the two sets of lower die seats on the turntable, and the positioning blocks are distributed at 90° to the two sets of lower die seats. The positioning block is provided with a conical hole 1 which is horizontally 90° to the lower die seat, and the bottom of the positioning block is provided with a conical hole 2 which is vertically 90° to the conical hole 1. The conical hole 1 and the conical hole 2 can be respectively inserted with a guide positioning rod 1 and a guide positioning rod 2, the guide positioning rod 1 is connected to the output end of the hydraulic cylinder 1, and the guide positioning rod 2 is connected to the output end of the hydraulic cylinder 2, and the hydraulic cylinder 1 and the hydraulic cylinder 2 are both installed outside the turntable.

[0008] Furthermore, the turntable is provided with two through holes corresponding to the second conical hole, the through holes and the second conical hole are in a concentric trumpet shape, the second guide positioning rod can pass through the through holes and be inserted into the second conical hole, and the first conical hole is in a trumpet shape.

[0009] Furthermore, the front ends of the guide positioning rod 1 and the guide positioning rod 2 are hemispherical.

[0010] Furthermore, the four sides of the first lower die base and the second lower die base are each provided with four notches 1 opening upward, the four sides of the upper die base are respectively provided with notches 2 opening downward, a convex block is installed in the notch 1, and a concave block is installed in the notch 2.

[0011] Furthermore, the upper die base is equipped with an upper die core, a receiving groove is provided in the upper die core, the receiving groove opening is downwardly facing the lower die, a pressure block is installed in the receiving groove, the pressure block is movably connected to the upper die core by a movable screw, and a reset spring is provided between the pressure block and the upper die core.

[0012] Furthermore, a removable fixed block is installed in the upper mold core, a receiving groove is provided at the front end of the fixed block, a pressure block is installed in the receiving groove, the pressure block is movably connected to the fixed block by a movable screw, a return spring is provided between the pressure block and the fixed block, the side wall of the receiving groove is designed to be an inclined surface, the opening of the receiving groove is larger than the pressure block, the left and right side surfaces of the pressure block are designed to be inclined surfaces, the inclined surfaces and the receiving groove fit each other and can slide smoothly.

[0013] The utility model proposes a positioning structure for an injection mold, which has the beneficial effect that before the mold is closed, hydraulic cylinders in two directions respectively push the guide positioning rod to insert into the two tapered holes of the positioning block, and during the mold closing process, through the action of this positioning mechanism, the upper mold base and the lower mold base can be more accurately and smoothly closed together, ensuring the positioning accuracy of the mold closing, and after completing an injection molding, the hydraulic cylinder will pull the guide positioning rod backward to exit the tapered hole of the positioning block, and after the turntable rotates 180 degrees, the structure repeats the above operation, and the mold is closed again, thereby improving the positioning accuracy of the mold closing, and can also reduce the occurrence of adverse conditions such as unsatisfactory molding of plastic parts and wear of mold parts due to inaccurate mold closing positioning, and extend the service life of the mold. The utility model has the characteristics of simple structure and easy operation.

[0014] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 ; Overall structural diagram of the utility model.

[0016] Figure 2 ; The overall exploded view of the utility model.

[0017] Figure 3 ; Figure 1 A magnified view of the local structure A.

[0018] Figure 4; Exploded view of the upper die base of the utility model.

[0019] Figure 5 ; Assembly drawing of the pressing block of the utility model.

[0020] Figure 6 ; Exploded view of the upper die core and the pressing block of the utility model.

[0021] Figure 7 ; Schematic diagram of the positioning block of the utility model.

[0022] Figure 8 ; Schematic diagram of the notch of the upper and lower mold bases of the utility model

[0023] Reference numerals: 1, turntable; 2, first lower die seat; 3, second lower die seat; 4, upper die seat; 5, hydraulic cylinder 1; 6, guide positioning rod 1; 7, guide positioning rod 2; 8, hydraulic cylinder 2; 9, positioning block; 11, through hole; 21, notch 1; 22, convex block; 41, notch 2; 42, concave block; 43, upper die core; 44, movable screw; 45, fixed block; 46, storage groove; 47, reset spring; 48, pressure block; 91, tapered hole 1; 92, tapered hole 2 DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0025] Please refer to Figure 1-8 ;

[0026] A rapid prototyping injection mold positioning structure includes a turntable 1, a motor is installed below the turntable 1, the motor is electrically connected to a controller, a gear is designed at the bottom of the turntable 1, the gear is meshed with a gear ring at the output end of the motor, the controller can accurately control the rotation of the turntable and can control the speed of the turntable rotation, two sets of centrally symmetrical first lower mold bases 2 and second lower mold bases 3 are installed on the turntable 1, and an upper mold base 4 used in conjunction with the first lower mold base 2 and the second lower mold base 3 is located above the turntable 1.

[0027] In the present embodiment, the first lower mold base 2 and the second lower mold base 3 are installed on the vertical injection molding machine together with the turntable 1, the upper mold base 4 is connected to the mold clamping mechanism of the injection molding machine, the first lower mold base 2 is located directly below the upper mold base 4, at this time, the upper mold base 4 and the first lower mold base 2 are in the open mold state, and two positioning blocks 9 are installed between the two sets of lower mold bases on the turntable 1, the positioning blocks 9 are distributed at 90° with the two sets of lower mold bases, and the positioning blocks 9 are provided with a conical hole 1 91 which is horizontally 90° to the lower mold base, and a conical hole 2 92 which is vertically 90° to the conical hole 1 91 is provided at the bottom of the positioning block 9, and the conical hole 1 91 and the conical hole 2 92 can be respectively inserted with a guide positioning rod 1 6 and a guide positioning rod 2 7, the guide positioning rod 1 6 is connected to the output end of the hydraulic cylinder 1 5, and the guide positioning rod 2 7 is connected to the output end of the hydraulic cylinder 2 8, the hydraulic cylinder 1 5 and the hydraulic cylinder 2 are both installed outside the turntable 1, and the hydraulic cylinder is electrically connected to an external controller, so that the hydraulic cylinder can automatically open and close the mold when the mold is opened and closed. The rotary disk 1 is operated in a cyclic manner. Two through holes 11 corresponding to the second tapered hole 92 are provided on the rotary disk 1. The through holes 11 and the second tapered hole 92 are in a concentric trumpet shape. The conical hole 191 is also in a trumpet shape. The through holes 11 and the second tapered hole 92 are designed to be concentric, which can play a better positioning role in mold closing. The trumpet-shaped cone hole and the guide positioning rod with a hemispherical front end can prevent the guide positioning rod from hitting the positioning block 9 under the push of the hydraulic cylinder when the guide positioning rod and the cone hole are not completely corresponding. At the same time, it can also guide the guide positioning rod when inserting the positioning block 9. Before the mold is closed, the two guide positioning rods are both outside the cone hole. The controller of the hydraulic cylinder is started. The hydraulic cylinder 15 drives the guide positioning rod 16 to be smoothly and accurately inserted into the corresponding cone hole 191. The hydraulic cylinder 28 drives the guide positioning rod 27 to pass through the through hole 11 and insert into the corresponding cone hole 292, so as to improve the positioning accuracy of the mold before closing.

[0028] In the present embodiment, the four sides of the first lower mold base 2 and the second lower mold base 3 are each provided with four notches 21 with openings facing upwards, and the four sides of the upper mold base 4 are respectively provided with notches 41 with openings facing downwards, and the convex block 22 is firmly installed in the notch 21 by screws, and the convex block 22 protrudes from the surface of the lower mold base, and the concave block 42 is firmly installed in the notch 41 by screws, and the mold closing function of the injection molding machine is started. The upper mold base 4 moves toward the direction of the first lower mold base 2 under the push of the mold closing mechanism, and the concave block 42 on the side of the upper mold base 4 and the convex block 22 on the side of the first lower mold base 2 gradually fit together. When the upper mold base 4 moves to contact with the first lower mold base 2, the mold is closed. Through the fit between the concave block 42 and the convex block 22, the mold can be guided and positioned more accurately during mold closing.

[0029] In the present embodiment, the upper mold core 43 and the fixed block 45 are assembled together in a detachable manner. The front end of the fixed block 45 is designed with a receiving groove 46 similar to an inverted Y shape. A pressure block 48 is installed in the receiving groove 46. The pressure block 48 is connected to the fixed block 45 through a movable screw 44. A return spring 47 is provided between the pressure block 48 and the fixed block 45. The return spring 47 is sleeved together with the movable screw 44 and installed together in the receiving groove 46. The mold closing function of the injection molding machine is started, and the mold closing mechanism of the injection molding machine pushes the upper mold base 4 to move downward. The pressure block 48 will first contact the first lower mold base 2, and the first lower mold base 2 begins to apply a reaction force to the pressure block 48. In the process of continuous mold closing, the return spring 47 is gradually compressed by the pressure block 48, and the pressure block 48 is gradually retracted into the receiving groove 46. The side wall of the receiving groove 46 is designed as an inclined surface, and the left and right side surfaces of the pressure block 48 are designed as inclined surfaces, so that the pressure block 48 can better fit with the fixed block 45 and can slide smoothly.

[0030] After the mold is closed, the injection mechanism of the injection molding machine injects the molten plastic through the gate of the upper mold base 4. After a period of pressure holding and cooling, the injection molding is completed, the mold is opened, and the mold closing mechanism of the injection molding machine drives the upper mold base 4 to move upward and gradually separate from the first lower mold base 2. At the same time, the convex block 22 on the side of the first lower mold base 2 gradually slides away from the concave block 42.

[0031] In the present embodiment, when the plastic part is being formed and the mold is opened, it may stick to the upper mold core 43 due to factors such as thermal expansion and contraction. When the mold is opened, the fixed block 45 moves upward together with the upper mold base 4. A return spring 47 is provided between the fixed block 45 and the pressure block 48. Under the action of the return spring 47, the pressure block 48 is gradually pushed out of the fixed block 45 by the return spring 47, but it does not separate from the first lower mold base 2. The pressure block 48 still applies a downward force to the plastic part in the lower mold base. Through the action of the pressure block 48, it can be ensured that the plastic part can be firmly pressed in the lower mold core when the mold is opened. When the upper mold base 4 moves to a certain distance, the mold is opened. Under the restriction of the movable screw 44, the pressure block 48 completely leaves the lower mold core. The movable screw 44 is used to connect the pressure block 48 and the fixed block 45, ensuring that the pressure block 48 will not fall off the fixed block 45 during the mold opening process.

[0032] After the mold is opened, the hydraulic cylinder 15 outside the turntable 1 drives the guide positioning rod 16 to exit the tapered hole 191, and the hydraulic cylinder 28 drives the guide positioning rod 27 to exit the tapered hole 292. The ejector of the injection molding machine passes through the bottom of the first lower mold base 2 and pushes the ejector plate at the bottom of the mold. The ejector on the ejector plate then ejects the plastic part out of the lower mold core. After the robot outside the injection molding machine reaches the lower mold core to take out the plastic part, the ejector of the injection molding machine retracts, and the ejector plate returns to the bottom of the mold under the action of the spring. The motor under the turntable 1 starts, and the output end of the motor drives the turntable 1. After rotating 180 degrees, the second lower die base 3 also rotates with the turntable 1 to the initial position of the first lower die base 2, and then the hydraulic cylinder 5 drives the guide positioning rod 6 to be smoothly and accurately inserted into the corresponding tapered hole 91. The hydraulic cylinder 28 drives the guide positioning rod 27 to pass through the through hole 11 on the turntable 1 and be inserted into the corresponding tapered hole 2 92. The upper die base 1 and the second lower die base 3 are molded together. The above structures repeat the above process to realize the function of a rapid molding injection mold positioning structure proposed by the utility model.

[0033] 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.

[0034] 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 implementations that can be understood by those skilled in the art.

Claims

1. A rapid prototyping injection mold positioning structure, comprising a turntable (1), characterized in that: The turntable (1) is provided with two sets of centrally symmetrical first lower die bases (2) and second lower die bases (3); and an upper die base (4) is provided above the turntable (1) and is used in conjunction with the first lower die base (2) and the second lower die base (3); Two positioning blocks (9) are installed between the two sets of lower die seats on the rotating disk (1). The positioning blocks (9) are distributed at 90 degrees with the two sets of lower die seats. The positioning blocks (9) are provided with a conical hole 1 (91) which is horizontally 90 degrees with the lower die seats. The bottom of the positioning block is provided with a conical hole 2 (92) which is vertically 90 degrees with the conical hole 1 (91). The conical hole 1 (91) and the conical hole 2 (92) can be respectively inserted with a guide positioning rod 1 (6) and a guide positioning rod 2 (7). The guide positioning rod 1 (6) is connected to the output end of the hydraulic cylinder 1 (5), and the guide positioning rod 2 (7) is connected to the output end of the hydraulic cylinder 2 (8). The hydraulic cylinder 1 (5) and the hydraulic cylinder 2 (8) are both installed outside the rotating disk (1).

2. A rapid prototyping injection mold positioning structure according to claim 1, characterized in that: The turntable (1) is provided with two through holes (11) corresponding to the second conical hole (92); the through holes (11) and the second conical hole (92) are in a concentric bell-mouth shape; the second guide positioning rod (7) can pass through the through holes (11) and be inserted into the second conical hole (92); the first conical hole (91) is also in a bell-mouth shape.

3. A rapid prototyping injection mold positioning structure according to claim 1, characterized in that: The front ends of the guide positioning rod 1 (6) and the guide positioning rod 2 (7) are hemispherical.

4. A rapid prototyping injection mold positioning structure according to claim 1, characterized in that: The four sides of the first lower die seat (2) and the second lower die seat (3) are each provided with four notches one (21) opening upwards, and the four sides of the upper die seat (4) are each provided with notches two (41) opening downwards, a convex block (22) is installed in the notch one (21), and a concave block (42) is installed in the notch two (41).

5. The rapid prototyping injection mold positioning structure according to claim 1, characterized in that: The upper die base (4) contains an upper die core (43), a receiving groove (46) is provided in the upper die core (43), the receiving groove (46) opens downward toward the lower die base, a pressure block (48) is installed in the receiving groove (46), the pressure block (48) is movably connected to the upper die core (43) through a movable screw (44), and a return spring (47) is provided between the pressure block (48) and the upper die core (43).

6. A rapid prototyping injection mold positioning structure according to claim 5, characterized in that: The upper mold core (43) is provided with a detachable fixed block (45), a receiving groove (46) is provided at the front end of the fixed block (45), a pressing block (48) is installed in the receiving groove (46), the pressing block (48) is movably connected to the fixed block (45) through a movable screw (44), a return spring (47) is provided between the pressing block (48) and the fixed block (45), the side wall of the receiving groove (46) is designed to be an inclined surface, the opening of the receiving groove (46) is larger than the pressing block (48), and the left and right side surfaces of the pressing block (48) are designed to be inclined surfaces.

Images