Plastic toy injection molding device and method

Abstract

The invention relates to the technical field of plastic processing, in particular to a plastic toy injection molding device and method.The device comprises a supporting frame, a lower mold, a first hydraulic cylinder, an upper mold, a mounting frame, a synchronous frame, a plurality of threaded mold cores, a driving mechanism, a displacement mechanism and an ejection mechanism; during use, the first hydraulic cylinder drives the upper mold to move downwards to be combined with the lower mold, molten plastic is injected into the mold cavity from the injection molding hole of the upper mold, cooling forming is waited, and a plurality of threaded holes are automatically formed in the positions where the threaded mold cores are located; then a driving mechanism is started to drive the multiple threaded mold cores to synchronously rotate, and meanwhile, the multiple threaded mold cores descend along with the synchronous frame until the multiple threaded mold cores exit from the threaded holes and then completely exit from the multiple mounting holes; the first hydraulic cylinder drives the upper die to move upwards away from the lower die; and finally, the displacement mechanism is started, the ejection mechanism is moved to the position below the lower mold, and the injection-molded part is ejected out of the lower mold from the multiple mounting holes. Therefore, demolding can be completed more efficiently.

Description

Technical Field

[0001] This invention relates to the field of plastic processing technology, and in particular to an injection molding apparatus and method for plastic toys. Background Technology

[0002] Injection molding is a widely used processing technique in the manufacturing of plastic toys. This process involves heating and melting thermoplastic or thermosetting plastic granules, injecting them into a closed mold cavity under high pressure, and then removing the product after cooling and solidification. This method efficiently produces plastic parts with complex structures and precise dimensions.

[0003] Many plastic toys require multiple parts to be connected by screws during assembly, thus necessitating the creation of multiple internal threaded holes in the injection molded parts. To achieve one-piece molding of such structures, existing technology typically incorporates removable threaded cores inside the mold. After injection molding, the threaded cores are removed from the mold along with the injection molded part, and then the threaded cores must be manually unscrewed one by one from the threaded holes in the injection molded part.

[0004] However, the above method not only requires additional disassembly of the threaded core during the demolding process, but also relies on manual operation to unscrew it from the finished product. The process is cumbersome and time-consuming, which seriously affects production efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a plastic toy injection molding apparatus and method that can complete demolding more efficiently.

[0006] To achieve the above objectives, the present invention provides a plastic toy injection molding apparatus, comprising a support frame, a lower mold, a first hydraulic cylinder, an upper mold, a mounting frame, a synchronization frame, multiple threaded cores, a drive mechanism, a displacement mechanism, and an ejection mechanism; The lower mold is fixedly mounted on the support frame; the first hydraulic cylinder is fixedly mounted on the support frame; the upper mold is fixedly mounted on the output end of the first hydraulic cylinder and located above the lower mold. The lower mold has multiple mounting holes; the mounting bracket is located below the lower mold; the synchronization bracket is slidably mounted on the mounting bracket; multiple threaded cores are rotatably mounted on the synchronization bracket and pass through the multiple mounting holes; the driving mechanism is mounted on the synchronization bracket and is used to drive the multiple threaded cores to rotate synchronously while also driving the synchronization bracket to rise and fall. The displacement mechanism is located at the bottom of the support frame; the ejection mechanism is located on the displacement mechanism, and the mounting frame is located on the displacement mechanism; the displacement mechanism is used to drive the mounting frame and the ejection mechanism to move.

[0007] The drive mechanism includes multiple driven gears, a motor, and a driving gear; Each threaded core has a driven gear fixedly mounted at its bottom; the motor is fixedly mounted on the synchronous frame; the driving gear is fixedly mounted at the output end of the motor and meshes with multiple driven gears respectively.

[0008] The drive mechanism further includes a threaded cylinder and a screw; The threaded cylinder is fixedly mounted on the mounting bracket; the screw is rotatably mounted on the synchronization bracket and threadedly connected to the threaded cylinder; the bottom end of the screw is fixedly connected to the output end of the motor.

[0009] The threaded core includes a rotating shaft section and a thread forming section; The rotating shaft section is rotatably mounted on the synchronous frame and fixedly connected to the driven gear, and passes through the mounting hole; the threaded section is fixedly mounted on the top of the rotating shaft section.

[0010] The threaded core also includes a retaining ring; The retaining ring is fixedly mounted on the rotating shaft section.

[0011] The displacement mechanism includes two guide rails, a sliding seat, and a second hydraulic cylinder. Two guide rails are fixedly mounted on the bottom of the support frame; the sliding seat is slidably mounted between the two guide rails and fixedly connected to the mounting frame; the second hydraulic cylinder is fixedly mounted on the support frame, and the output end of the second hydraulic cylinder is fixedly connected to the sliding seat; the ejection mechanism is mounted on the sliding seat.

[0012] The ejection mechanism includes two guide rods, a mounting plate, a third hydraulic cylinder, and multiple ejection rods. The two guide rods are slidably mounted on the sliding seat and pass through the sliding seat respectively; the mounting plate is fixedly mounted on the top of the two guide rods; the third hydraulic cylinder is fixedly mounted on the sliding seat, and the output end of the third hydraulic cylinder is fixedly connected to the mounting plate; the plurality of ejector rods are fixedly mounted on the top of the mounting plate respectively.

[0013] The ejector rod includes a rod body, a spring, and an ejector head; The rod is fixedly mounted on the top of the mounting plate; the spring is mounted inside the rod; and the top head is slidably mounted inside the rod.

[0014] The plastic toy injection molding device also includes an inlet head and an outlet head; The lower mold is also provided with a cooling cavity; the water inlet head is fixedly disposed on one side of the lower mold and communicates with the cooling cavity; the water outlet head is fixedly disposed on the side of the lower mold away from the water inlet head and communicates with the cooling cavity.

[0015] The present invention also provides a method for injection molding plastic toys, comprising the following steps: The first hydraulic cylinder drives the upper mold to move down and fit against the lower mold, thus achieving mold closing; Molten plastic is injected into the mold cavity through the injection hole of the upper mold, and the injection molded part is allowed to cool and solidify. When the drive mechanism is activated, multiple threaded cores rotate synchronously and descend along with the synchronous frame until the multiple threaded cores are completely withdrawn from the multiple mounting holes; The first hydraulic cylinder drives the upper mold to move upward, away from the lower mold; The displacement mechanism is activated, moving the ejection mechanism below the lower mold and ejecting the injection molded part from the lower mold through multiple mounting holes.

[0016] The present invention discloses a plastic toy injection molding apparatus and method, wherein a first hydraulic cylinder is used to drive the upper mold to rise and fall, and when the upper mold moves down to close with the lower mold, the interior forms a mold cavity, and molten plastic is injected into the mold cavity to form a toy injection molded part; the mounting frame is used to slide the synchronous frame, and a plurality of threaded cores are rotatably arranged on the synchronous frame, which can both rotate and rise and fall with the synchronous frame; In use, the synchronizing frame is at its highest point, and multiple threaded cores pass through the mounting holes and extend into the lower mold. The first hydraulic cylinder drives the upper mold to move downwards and close with the lower mold, injecting molten plastic into the mold cavity through the injection hole of the upper mold. After cooling and molding, multiple threaded holes are automatically formed at the locations of the multiple threaded cores. Then, the drive mechanism is activated, causing the multiple threaded cores to rotate synchronously while descending with the synchronizing frame until the multiple threaded cores exit from the threaded holes and then completely exit from the multiple mounting holes. The first hydraulic cylinder drives the upper mold to move upwards, away from the lower mold. Finally, the displacement mechanism is activated, moving the ejection mechanism below the lower mold, and ejecting the molded part from the lower mold through the multiple mounting holes. This allows for more efficient demolding. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0018] Figure 1 This is a schematic diagram of the structure of the first embodiment of the present invention.

[0019] Figure 2 This is a cross-sectional view of the first embodiment of the present invention.

[0020] Figure 3 yes Figure 2 A magnified view of detail A.

[0021] Figure 4 This is a cross-sectional view of the ejector rod of the present invention.

[0022] Figure 5 This is a schematic diagram of the structure of the lower mold, mounting frame, synchronization frame, threaded core and drive mechanism of the present invention.

[0023] Figure 6 This is a structural schematic diagram of the lower mold, mounting bracket, synchronization bracket, threaded core, and drive mechanism of the present invention from another angle.

[0024] Figure 7 This is a flowchart illustrating the second embodiment of the present invention.

[0025] 1-Support frame, 2-Lower mold, 3-First hydraulic cylinder, 4-Upper mold, 5-Mounting frame, 6-Synchronizing frame, 7-Threaded core, 8-Drive mechanism, 9-Displacement mechanism, 10-Ejection mechanism, 11-Inlet head, 12-Outlet head, 201-Mounting hole, 202-Cooling chamber, 701-Rotating shaft section, 702-Thread forming section, 703-Retaining ring, 801-Driven gear, 802-Motor, 803-Drive gear, 804-Threaded cylinder, 805-Screw, 901-Guide rail, 902-Sliding seat, 903-Second hydraulic cylinder, 1001-Guide rod, 1002-Mounting plate, 1003-Third hydraulic cylinder, 1004-Ejection rod, 10041-Rod body, 10042-Spring, 10043-Ejector head. Detailed Implementation

[0026] The first embodiment of this application is as follows: Please see Figures 1-6 ,in, Figure 1 This is a schematic diagram of the structure of the first embodiment of the present invention. Figure 2 This is a cross-sectional view of the first embodiment of the present invention. Figure 3 yes Figure 2 A magnified view of detail A. Figure 4 This is a cross-sectional view of the ejector rod of the present invention. Figure 5 This is a schematic diagram of the structure of the lower mold, mounting frame, synchronization frame, threaded core and drive mechanism of the present invention. Figure 6 This is a structural schematic diagram of the lower mold, mounting bracket, synchronization bracket, threaded core, and drive mechanism of the present invention from another angle.

[0027] This invention provides a plastic toy injection molding apparatus: comprising a support frame 1, a lower mold 2, a first hydraulic cylinder 3, an upper mold 4, a mounting frame 5, a synchronization frame 6, multiple threaded cores 7, a drive mechanism 8, a displacement mechanism 9, and an ejection mechanism 10; the lower mold 2 has multiple mounting holes 201; the drive mechanism 8 includes multiple driven gears 801, a motor 802, and a drive gear 803; the drive mechanism 8 also includes a threaded cylinder 804 and a screw 805; the threaded core 7 includes a rotating shaft section 701 and a thread forming section 702; the threaded core 7 also... The device includes a retaining ring 703; the displacement mechanism 9 includes two guide rails 901, a sliding seat 902, and a second hydraulic cylinder 903; the ejection mechanism 10 includes two guide rods 1001, a mounting plate 1002, a third hydraulic cylinder 1003, and multiple ejection rods 1004; each ejection rod 1004 includes a rod body 10041, a spring 10042, and an ejector head 10043; the plastic toy injection molding device also includes a water inlet head 11 and a water outlet head 12; the lower mold 2 is also provided with a cooling chamber 202; the aforementioned scheme can achieve demolding more efficiently.

[0028] Furthermore, the lower mold 2 is fixedly mounted on the support frame 1; the first hydraulic cylinder 3 is fixedly mounted on the support frame 1; and the upper mold 4 is fixedly mounted on the output end of the first hydraulic cylinder 3 and located above the lower mold 2. The lower mold 2 has multiple mounting holes 201; the mounting bracket 5 is located below the lower mold 2; the synchronous bracket 6 is slidably mounted on the mounting bracket 5; multiple threaded cores 7 are rotatably mounted on the synchronous bracket 6 and pass through multiple mounting holes 201 respectively; the driving mechanism 8 is mounted on the synchronous bracket 6 and is used to drive the multiple threaded cores 7 to rotate synchronously while also driving the synchronous bracket 6 to rise and fall. The displacement mechanism 9 is disposed at the bottom of the support frame 1; the ejection mechanism 10 is disposed on the displacement mechanism 9, and the mounting frame 5 is disposed on the displacement mechanism 9; the displacement mechanism 9 is used to drive the mounting frame 5 and the ejection mechanism 10 to move.

[0029] In this embodiment, the first hydraulic cylinder 3 is used to drive the upper mold 4 to rise and fall. When the upper mold 4 moves down to close with the lower mold 2, the interior forms a mold cavity. Molten plastic is injected into the mold cavity to form a toy injection molded part. The mounting bracket 5 is used to slide the synchronous frame 6. Multiple threaded cores 7 are rotatably arranged on the synchronous frame 6, which can both rotate and rise and fall with the synchronous frame 6. In use, the synchronization frame 6 is at its highest point, and multiple threaded cores 7 pass through the mounting holes 201 and extend into the lower mold 2. The first hydraulic cylinder 3 drives the upper mold 4 to move downward and close with the lower mold 2, injecting molten plastic into the mold cavity through the injection hole of the upper mold 4. After cooling and molding, multiple threaded holes are automatically formed at the locations of the multiple threaded cores 7. Then, the drive mechanism 8 is activated, driving the multiple threaded cores 7 to rotate synchronously while descending with the synchronization frame 6 until the multiple threaded cores 7 exit from the threaded holes and then completely exit from the multiple mounting holes 201. The first hydraulic cylinder 3 drives the upper mold 4 to move upward, away from the lower mold 2. Finally, the displacement mechanism 9 is activated, moving the ejection mechanism 10 below the lower mold 2, ejecting the injection molded part from the lower mold 2 through the multiple mounting holes 201. This allows for more efficient demolding.

[0030] Furthermore, each of the threaded cores 7 is fixedly provided with a driven gear 801 at its bottom; the motor 802 is fixedly provided on the synchronous frame 6; the driving gear 803 is fixedly provided at the output end of the motor 802 and meshes with the multiple driven gears 801 respectively.

[0031] In this embodiment, the motor 802 drives the drive gear 803 to rotate, and the drive gear 803 drives multiple driven gears 801 to rotate synchronously, thereby driving multiple threaded cores 7 to rotate synchronously.

[0032] Furthermore, the threaded cylinder 804 is fixedly mounted on the mounting bracket 5; the screw 805 is rotatably mounted on the synchronization bracket 6 and threadedly connected to the threaded cylinder 804; the bottom end of the screw 805 is fixedly connected to the output end of the motor 802.

[0033] In this embodiment, the driving gear 803 and the multiple driven gears 801 have the same structural parameters and a transmission ratio of 1:1; therefore, the screw 805 and the multiple threaded cores 7 have the same angular velocity; the pitch of the screw 805 is the same as the pitch of the threaded cores 7; therefore, the screwing speed is the same. The distance the threaded core 7 descends from the formed threaded hole is the same distance the screw 805 descends from the threaded cylinder 804, and the same distance the synchronizing frame 6 descends, thus achieving synchronization.

[0034] Furthermore, the rotating shaft section 701 is rotatably mounted on the synchronous frame 6 and fixedly connected to the driven gear 801, and passes through the mounting hole 201; the threaded section 702 is fixedly mounted on the top of the rotating shaft section 701.

[0035] In this embodiment, the outer surface of the rotating shaft section 701 is smooth and perfectly meshes with the mounting hole 201 to minimize leakage during injection molding; the thread forming section 702 is used to form threaded holes.

[0036] Furthermore, the retaining ring 703 is fixedly mounted on the rotating shaft section 701.

[0037] In this embodiment, the retaining ring 703 is used to control the stroke of the thread forming section 702 inserted into the lower die 2.

[0038] Furthermore, the two guide rails 901 are respectively fixedly installed at the bottom of the support frame 1; the sliding seat 902 is slidably installed between the two guide rails 901 and is fixedly connected to the mounting frame 5; the second hydraulic cylinder 903 is fixedly installed on the support frame 1, and the output end of the second hydraulic cylinder 903 is fixedly connected to the sliding seat 902; the ejection mechanism 10 is installed on the sliding seat 902.

[0039] In this embodiment, the two guide rails 901 are used to horizontally slide the sliding seat 902. Under the drive of the second hydraulic cylinder 903, the sliding seat 902 can drive the mounting bracket 5 and the ejection mechanism 10 to move. When the sliding seat 902 slides to the left, the ejection mechanism 10 can be moved below the lower mold 2.

[0040] Furthermore, the two guide rods 1001 are slidably disposed on the sliding seat 902 and pass through the sliding seat 902 respectively; the mounting plate 1002 is fixedly disposed on the top of the two guide rods 1001; the third hydraulic cylinder 1003 is fixedly disposed on the sliding seat 902, and the output end of the third hydraulic cylinder 1003 is fixedly connected to the mounting plate 1002; and a plurality of ejector rods 1004 are fixedly disposed on the top of the mounting plate 1002 respectively.

[0041] In this embodiment, the multiple ejector rods 1004 are used to fit the multiple mounting holes 201. After moving to the lower mold 2 and aligning with the multiple mounting holes 201, the mounting plate 1002 drives the multiple ejector rods 1004 to move upward under the drive of the third hydraulic cylinder 1003, inserting them into the lower mold 2 and ejecting the injection molded part upward.

[0042] Furthermore, the rod 10041 is fixedly disposed on the top of the mounting plate 1002; the spring 10042 is disposed inside the rod 10041; and the top head 10043 is slidably disposed inside the rod 10041.

[0043] In this embodiment, when ejecting the injection molded part, the ejector head 10043 contacts the injection molded part, and the spring 10042 acts as a buffer to achieve flexible contact and avoid damage to the injection molded part from rigid impact.

[0044] Furthermore, the lower mold 2 is also provided with a cooling cavity 202; the water inlet head 11 is fixedly disposed on one side of the lower mold 2 and communicates with the cooling cavity 202; the water outlet head 12 is fixedly disposed on the side of the lower mold 2 away from the water inlet head 11 and communicates with the cooling cavity 202.

[0045] In this embodiment, water pipes are connected to the water inlet 11 and the water outlet 12, so that circulating water flows in the cooling chamber 202, which can accelerate the cooling and molding of the injection molded part.

[0046] In this embodiment, a plastic toy injection molding device is used such that, when the synchronization frame 6 is at its highest point, multiple threaded cores 7 pass through the mounting holes 201 and extend into the lower mold 2; the first hydraulic cylinder 3 drives the upper mold 4 to move downwards and close with the lower mold 2, injecting molten plastic into the mold cavity through the injection hole of the upper mold 4, waiting for cooling and molding, and automatically forming multiple threaded holes at the locations of the multiple threaded cores 7; then the drive mechanism 8 is activated, driving the multiple threaded cores 7 to rotate synchronously while descending with the synchronization frame 6 until the multiple threaded cores 7 exit from the threaded holes and then completely exit from the multiple mounting holes 201; the first hydraulic cylinder 3 drives the upper mold 4 to move upwards, away from the lower mold 2; finally, the displacement mechanism 9 is activated, moving the ejection mechanism 10 below the lower mold 2, ejecting the injection molded part from the lower mold 2 through the multiple mounting holes 201. This allows for more efficient demolding.

[0047] The second embodiment of this application is as follows: Based on the first embodiment, please refer to Figure 7 ,in, Figure 7 This is a flowchart illustrating the second embodiment of the present invention.

[0048] The present invention provides a method for injection molding plastic toys, comprising the following steps: S1: The first hydraulic cylinder 3 drives the upper mold 4 to move down and fit against the lower mold 2, thus achieving mold closing; S2: Inject molten plastic into the mold cavity through the injection hole of the upper mold 4, and wait for the injection molded part to cool and solidify; S3: Start the drive mechanism 8. As multiple threaded cores 7 rotate synchronously, they descend with the synchronous frame 6 until the multiple threaded cores 7 are completely withdrawn from the multiple mounting holes 201. S4: The first hydraulic cylinder 3 drives the upper mold 4 to move upward and away from the lower mold 2; S5: Activate the displacement mechanism 9 to move the ejection mechanism 10 below the lower mold 2, and eject the injection molded part from the lower mold 2 through the multiple mounting holes 201.

[0049] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A plastic toy injection molding apparatus, characterized in that, It includes a support frame, a lower mold, a first hydraulic cylinder, an upper mold, a mounting frame, a synchronization frame, multiple threaded cores, a drive mechanism, a displacement mechanism, and an ejection mechanism; The lower mold is fixedly mounted on the support frame; the first hydraulic cylinder is fixedly mounted on the support frame; the upper mold is fixedly mounted on the output end of the first hydraulic cylinder and located above the lower mold. The lower mold has multiple mounting holes; the mounting bracket is located below the lower mold; the synchronization bracket is slidably mounted on the mounting bracket; multiple threaded cores are rotatably mounted on the synchronization bracket and pass through the multiple mounting holes; the driving mechanism is mounted on the synchronization bracket and is used to drive the multiple threaded cores to rotate synchronously while also driving the synchronization bracket to rise and fall. The displacement mechanism is located at the bottom of the support frame; the ejection mechanism is located on the displacement mechanism, and the mounting frame is located on the displacement mechanism; the displacement mechanism is used to drive the mounting frame and the ejection mechanism to move.

2. The plastic toy injection molding apparatus as described in claim 1, characterized in that, The drive mechanism includes multiple driven gears, a motor, and a driving gear; Each threaded core has a driven gear fixedly mounted at its bottom; the motor is fixedly mounted on the synchronous frame; the driving gear is fixedly mounted at the output end of the motor and meshes with multiple driven gears respectively.

3. The plastic toy injection molding apparatus as described in claim 2, characterized in that, The drive mechanism also includes a threaded cylinder and a screw; The threaded cylinder is fixedly mounted on the mounting bracket; the screw is rotatably mounted on the synchronization bracket and threadedly connected to the threaded cylinder; the bottom end of the screw is fixedly connected to the output end of the motor.

4. The plastic toy injection molding apparatus as described in claim 3, characterized in that, The threaded core includes a rotating shaft section and a thread forming section; The rotating shaft section is rotatably mounted on the synchronous frame and fixedly connected to the driven gear, and passes through the mounting hole; the threaded section is fixedly mounted on the top of the rotating shaft section.

5. The plastic toy injection molding apparatus as described in claim 4, characterized in that, The threaded core also includes a retaining ring; The retaining ring is fixedly mounted on the rotating shaft section.

6. The plastic toy injection molding apparatus as described in claim 5, characterized in that, The displacement mechanism includes two guide rails, a sliding seat, and a second hydraulic cylinder; Two guide rails are fixedly mounted on the bottom of the support frame; the sliding seat is slidably mounted between the two guide rails and fixedly connected to the mounting frame; the second hydraulic cylinder is fixedly mounted on the support frame, and the output end of the second hydraulic cylinder is fixedly connected to the sliding seat; the ejection mechanism is mounted on the sliding seat.

7. The plastic toy injection molding apparatus as described in claim 6, characterized in that, The ejection mechanism includes two guide rods, a mounting plate, a third hydraulic cylinder, and multiple ejection rods; The two guide rods are slidably mounted on the sliding seat and pass through the sliding seat respectively; the mounting plate is fixedly mounted on the top of the two guide rods; the third hydraulic cylinder is fixedly mounted on the sliding seat, and the output end of the third hydraulic cylinder is fixedly connected to the mounting plate; the plurality of ejector rods are fixedly mounted on the top of the mounting plate respectively.

8. The plastic toy injection molding apparatus as described in claim 7, characterized in that, The ejector rod includes a rod body, a spring, and an ejector head; The rod is fixedly mounted on the top of the mounting plate; the spring is mounted inside the rod; and the top head is slidably mounted inside the rod.

9. The plastic toy injection molding apparatus as described in claim 8, characterized in that, The plastic toy injection molding device also includes a water inlet and a water outlet; The lower mold is also provided with a cooling cavity; the water inlet head is fixedly disposed on one side of the lower mold and communicates with the cooling cavity; the water outlet head is fixedly disposed on the side of the lower mold away from the water inlet head and communicates with the cooling cavity.

10. A method for injection molding a plastic toy, applied to the plastic toy injection molding apparatus as described in claim 1; characterized in that, Includes the following steps: The first hydraulic cylinder drives the upper mold to move down and fit against the lower mold, thus achieving mold closing; Molten plastic is injected into the mold cavity through the injection hole of the upper mold, and the injection molded part is allowed to cool and solidify. When the drive mechanism is activated, multiple threaded cores rotate synchronously and descend along with the synchronous frame until the multiple threaded cores are completely withdrawn from the multiple mounting holes; The first hydraulic cylinder drives the upper mold to move upward, away from the lower mold; The displacement mechanism is activated, moving the ejection mechanism below the lower mold and ejecting the injection molded part from the lower mold through multiple mounting holes.

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