Centering structure and centering method for ultrasonic plasticization microinjection

Abstract

The present invention provides a centering structure and a centering method for ultrasonic plasticization microinjection, relating to the field of ultrasonic plasticization, comprising: a supporting unit, comprising a vibrator push plate, the vibrator push plate being capable of rising and falling in the Z-axis direction, the center of the vibrator push plate being provided with an inverted conical through hole; an ultrasonic module, comprising an ultrasonic tool head, a limiting ring, a pressure block and a pressure ring, the limiting ring being used to limit radial movement of the ultrasonic tool head, the pressure block and the pressure ring being used to limit axial movement of the ultrasonic tool head, a fixed plate being provided below the vibrator push plate, the center of the fixed plate being provided with a mounting hole, the mounting hole being provided with a centering block; and a two-dimensional moving mechanism being used to adjust the coaxiality of the centering block and the ultrasonic tool head. The present application reduces the additional amplitude generated by the assembly gap during the vibration of the ultrasonic tool head, thereby improving the accuracy of centering.

Description

Technical Field

[0001] The present invention relates to the field of ultrasonic plasticization, and in particular to a centering structure and a centering method for ultrasonic plasticization microinjection. Background Art

[0002] Microstructured parts are crucial components in microelectromechanical systems (MEMS), widely used in fields such as microstructure measurement and microelectronics packaging. Ultrasonic microinjection molding combines the advantages of energy conservation and material savings with reduced resistance to microstructure filling. It has significant potential for molding complex, dimensionally precise microstructured parts and achieving mass production.

[0003] Ultrasonic high-frequency vibration is a key factor in ultrasonic plasticization micro-injection molding technology. For ultrasonic plasticization micro-injection molding equipment, it requires that the inner diameter of the guide sleeve in the upper mold core (a plastic protective sleeve used to protect the ultrasonic tool head) is only about 1MM larger than the diameter of the ultrasonic tool head (to seal and prevent the melt from overflowing), and to avoid contact between the tool head and the guide sleeve (to prevent the guide sleeve from melting and flowing into the mold cavity under high-frequency vibration).

[0004] However, current ultrasonic plasticization micro-injection molding equipment suffers from low centering accuracy of the ultrasonic tool head, which can easily cause contact with the upper mold core guide sleeve during the plasticization process, potentially damaging the tool head (P.S.: Customizing the guide sleeve and ultrasonic tool head is expensive). Therefore, in order to improve the centering accuracy of the ultrasonic tool head and achieve precise centering of the ultrasonic tool head during the plasticization process, there is an urgent need for a device and control method for controlling the centering accuracy of the ultrasonic tool head. Summary of the Invention

[0005] The present invention provides a centering structure for ultrasonic plasticization microinjection, the purpose of which is to improve the accuracy of the ultrasonic tool head and thereby improve the precise centering during the plasticization process.

[0006] In order to achieve the above objectives, an embodiment of the present invention provides a centering structure for ultrasonic plasticization microinjection, comprising:

[0007] The support unit includes a vibrator push plate, the vibrator push plate can be raised and lowered in the Z-axis direction, and an inverted conical through hole is provided at the center of the vibrator push plate;

[0008] The ultrasonic module includes an ultrasonic tool head, a limiting ring, a pressure block and a pressure ring. The limiting ring is formed by butting two half rings together. The outer surface of the half ring has an inclined surface that matches the shape of the conical through hole. The inner surface of the half ring is formed with a semi-ring groove arranged along the circumferential direction. The semi-ring groove is used to fit with the side surface of the ultrasonic tool head shoulder. The half ring forms a shoulder above the semi-ring groove. The shoulder and the ultrasonic tool head form an insertion space. The L-shaped pressure block is inserted into the insertion space and abuts against the upper surface of the shoulder.

[0009] The pressure ring is pressed against the upper surface of the limiting ring and the pressure block and is fixedly connected to the vibrator push plate;

[0010] A fixed platen is provided below the vibrator push plate, a mounting hole is provided at the center of the fixed platen, and a centering block is provided in the mounting hole;

[0011] A two-dimensional moving mechanism for adjusting the coaxiality between the centering block and the ultrasonic tool head;

[0012] The detection unit is arranged on the fixed template and is used to detect the coaxiality between the counterweight block and the ultrasonic tool head.

[0013] Preferably, the two-dimensional moving mechanism is arranged on the fixed template, and the two-dimensional moving mechanism includes an X-direction moving unit and a Y-direction moving unit. The X-direction moving unit is arranged on the fixed template, and a first moving plate is arranged on the X-direction moving unit. The Y-direction moving unit is arranged on the first moving plate, and a second moving plate is arranged on the Y-direction moving unit. Through holes are opened in the middle of the first and second moving plates, and the vibrator push plate is arranged on the second moving plate.

[0014] Preferably, the supporting unit also includes a top plate, which is arranged above the vibrator push plate, and a guide column and a screw passing through the vibrator push plate are arranged between the top plate and the second movable plate, and the screw is screwed to the vibrator push plate. There are two guide columns and two screws respectively, and the two guide columns and two screws are arranged diagonally. A synchronous wheel is provided above the two screws, and the lower part of the screw is rotatably connected to the second movable plate. A driving motor is also provided on the top plate, and the output end of the driving motor is belt-driven with the synchronous wheel.

[0015] Preferably, the centering block is interference fit with the mounting hole.

[0016] Preferably, the centering block is clearance-matched with the mounting hole, and the two-dimensional moving mechanism is connected to the centering block to adjust the position of the centering block in the mounting hole.

[0017] Preferably, the supporting unit is also provided with a top plate, which is arranged above the vibrator push plate, and a guide column and a screw passing through the vibrator push plate are arranged between the top plate and the fixed template, and the screw is screwed to the vibrator push plate, and two guide columns and two screws are respectively provided, and the two guide columns and the two screws are arranged diagonally, and a synchronous wheel is provided above the two screws, and a synchronous wheel is provided above the screw, and the lower rotating wheel is arranged on the fixed template, and a driving motor is also provided on the top plate, and the output end of the driving motor is belt-driven with the synchronous wheel.

[0018] Preferably, the two-dimensional moving mechanism comprises a slide rail provided on the fixed template, the slide rail being provided with a fine-tuning screw perpendicular to the length direction of the slide rail, and the fine-tuning screw moving in a direction perpendicular to the length direction of the slide rail;

[0019] The fine-tuning screws of the two two-dimensional moving mechanisms are arranged at right angles around the mounting hole, and the fine-tuning screws are fixedly connected to the centering block.

[0020] Preferably, a movable template for accommodating the mold is further provided below the fixed template, and the upper mold of the mold is provided with a mold hole that is interference-fitted with the centering block.

[0021] The present application also provides a centering method, which uses the aforementioned centering structure for ultrasonic plasticization microinjection, and is characterized in that it includes the following steps:

[0022] S1. Install the centering block on the mounting hole, ensuring an interference fit or clearance fit between the centering block and the mounting hole.

[0023] S2. Assemble the ultrasonic module and fix the ultrasonic module in the conical through hole;

[0024] S3. Adjust the initial position of the ultrasonic tool head on the Z axis so that the ultrasonic tool head and the centering block are within the detection range of the detection unit;

[0025] S5. Adjust the two-dimensional moving mechanism until the centering block and the ultrasonic tool head are aligned;

[0026] S6. Place the mold on the movable platen and insert the centering block into the mold hole, with the mold hole and the centering block having an interference fit.

[0027] Preferably, in step S2, two half rings are first used to surround the ultrasonic tool head at the boss of the ultrasonic tool head, and the side of the half ring groove is in contact with the side of the boss. Then, the ultrasonic tool head with the limiting ring is placed in the conical through hole, and after the pressure block is inserted into the insertion space, the pressure ring is used to axially fix the limiting ring and the pressure block.

[0028] The above solution of the present invention has the following beneficial effects:

[0029] In the present application, a limiting ring, a pressure block and a pressure ring are respectively used to limit the radial and axial movement of the ultrasonic tool head, thereby reducing the additional amplitude generated by the assembly gap during the vibration of the ultrasonic tool head and improving the accuracy of alignment.

[0030] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Schematic diagram of the ultrasonic module and the vibrator push plate of the present invention;

[0032] Figure 2 yes Figure 1 sectional view of

[0033] Figure 3 yes Figure 1 Schematic diagram of the middle limit ring;

[0034] Figure 4 It is the centering structure in Example 1;

[0035] Figure 5 is a schematic diagram of the centering block and the fixed platen in Example 1;

[0036] Figure 6 This is the centering structure in Example 2

[0037] Figure 7 The two-dimensional moving mechanism of embodiment 2;

[0038] Figure 8 It is a cross-sectional view of the movable mechanism and the upper mold of Example 2.

[0039] [Description of Reference Numerals]

[0040] 1-support unit, 11-vibrator push plate, 12-conical through hole, 13-top plate, 14-guide column, 15-screw, 16-synchronous wheel, 17-drive motor,

[0041] 2-ultrasonic module, 21-ultrasonic tool head, 22-pressing block, 23-pressing ring, 24-half ring, 241-half ring groove, 242-shoulder

[0042] 3-fixed template, 31-mounting hole, 32-centering block,

[0043] 4-two-dimensional moving mechanism, 41A-X-direction moving unit, 42A-Y-direction moving unit, 43A-first moving plate, 44A-second moving plate,

[0044] 41B-slide rail, 42B-fine-tuning screw,

[0045] 5-Detection unit,

[0046] 6-Dynamic template,

[0047] 7-upper mold, 71-die hole. DETAILED DESCRIPTION

[0048] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0049] like Figure 1-8The centering structure shown in the figure for ultrasonic plasticization microinjection includes a support unit 1, an ultrasonic module 2, a fixed template 3, a two-dimensional moving mechanism 4 and a detection unit 5, wherein the support unit 1 includes a vibrator push plate 11, which can be raised and lowered in the Z-axis direction, and the vibrator push plate 11 is a plate with a thickness to facilitate the formation of an inverted conical through hole 12 in the center of the vibrator push plate 11. The ultrasonic module 2 includes an ultrasonic tool head 21, a limiting ring, an L-shaped pressure block 22, and a pressure ring 23. The limiting ring is formed by connecting two half rings 24. The outer surface below the half ring 24 has an inclined surface that matches the shape of the conical through hole 12. The inner surface of the half ring 24 is formed with a semi-annular groove 241 arranged in the circumferential direction. The semi-annular groove 241 is used to fit with the shoulder side surface of the ultrasonic tool head 21. The half ring 24 also has a shoulder 242 above the semi-annular groove 241. When the half ring 24 is assembled with the ultrasonic tool head 21, the shoulder 242 forms an insertion space with the ultrasonic tool head 21. The L-shaped insertion block is inserted into the insertion space and abuts against the upper surface of the shoulder 242. The aforementioned pressure ring 23 is pressed against the upper surface of the limiting ring and the pressure block 22 and is fixedly connected to the vibrator push plate 11. Preferably, the pressure ring 23 is composed of four fan-shaped blocks in the shape of a quarter circle.

[0050] Preferably, refer to Figure 3 The lower end of one of the half rings 24 has an inclined surface, and the upper end is formed with a plane, on which a threaded hole is provided for screwing with the other half ring 24 to ensure the fastening of the two half rings 24 and to achieve the side of the semi-ring groove 241 fitting with the shoulder side surface of the ultrasonic tool head 21.

[0051] In the present application, utilizing the conical characteristics of the conical through hole 12 and the limiting ring, when the ultrasonic tool head 21 is clamped between the two half rings 24, the limiting ring will automatically adjust the axis of the ultrasonic tool head 21 to be colinear with the axis of the conical through hole 12 under the action of gravity, thereby limiting the movement of the ultrasonic tool head 21 in the radial direction.

[0052] Furthermore, the ultrasonic tool head 21 is restricted in the axial direction by the pressing block 22 and the pressing ring 23 , thereby preventing the ultrasonic tool head 21 from moving in the axial direction.

[0053] The aforementioned fixed template 3 is arranged below the vibrator push plate 11 . A mounting hole 31 is provided at the center of the fixed template 3 , and a centering block 32 is provided in the mounting hole 31 .

[0054] The aforementioned two-dimensional moving mechanism 4 adjusts the coaxiality of the centering block 32 and / or the ultrasonic tool head 21 to complete the centering operation.

[0055] The detection unit 5 is provided on the fixed template 3 and is used to obtain the coaxiality between the centering block 32 and the ultrasonic tool head 21 and adjust the movement amplitude of the two-dimensional moving mechanism 4. Preferably, the detection unit 5 is an industrial camera.

[0056] In the present application, the position of the ultrasonic tool head 21 is restricted by a limiting ring, a pressure block 22 and a pressure ring 23, thereby avoiding radial and axial movement of the ultrasonic tool head 21, so that the centering accuracy is higher during the centering process of the ultrasonic tool head 21 and the centering block 32.

[0057] In combination with the core concept of the present invention, the present application provides two different structures of two-dimensional moving mechanisms 4, forming the centering structure for ultrasonic plasticization microinjection in Example 1, referring to Figure 4 and 5 In this embodiment, the two-dimensional moving mechanism 4 is arranged on the fixed template 3. The two-dimensional moving mechanism 4 includes an X-direction moving unit 41A and a Y-direction moving unit 42A. The X-direction moving unit 41A is arranged on the fixed template 3. A first moving plate 43A is arranged on the X-direction moving unit 41A. The Y-direction moving unit 42A is arranged on the first moving plate 43A. A second moving plate 44A is also arranged on the Y-direction moving unit 42A. Through holes are opened on the first moving plate 43A and the second moving plate 44A for the ultrasonic tool head 21 to pass through. The aforementioned vibrator push plate 11 is arranged on the second moving plate 44A and moves with the second moving plate 44A.

[0058] Specifically, the X-direction moving unit 41A and the Y-direction moving unit 42A are linear modules, which are arranged along the X-axis direction and the Y-axis direction. The first moving plate 43A and the second moving plate 44A are respectively arranged on the two linear modules to realize the movement of the first moving plate 43A and the second moving plate 44A in the X-direction and the Y-direction.

[0059] Furthermore, in order to realize the movement of the vibrator push plate 11 and the second movable plate 44A and the movement of the ultrasonic tool head 21 in the Z-axis direction, the support unit 1 also includes a top plate 13 located above the vibrator push plate 11, and a guide column 14 and a screw 15 are arranged between the top plate 13 and the second movable plate 44A. The guide column 14 passes through the vibrator push plate 11 to guide the vibrator push plate 11 to slide along the Z-axis direction. The screw 15 is screwed to the vibrator push plate 11 to form a screw structure, which provides power for the movement of the vibrator push plate 11 along the Z-axis.

[0060] Preferably, two guide posts 14 and two screw rods 15 are provided, and the two guide posts 14 and the two screw rods 15 are arranged diagonally, with the intersection of the two diagonals located on the axis of the conical through hole 12. The diagonal arrangement of the guide posts 14 and the screw rods 15 ensures that the vibrator push plate 11 remains stable during the Z-direction movement, thereby improving accuracy.

[0061] A driving motor 17 is also provided on the top plate 13 , and the driving motor 17 is connected to the two screw rods 15 in a transmission manner.

[0062] Specifically, the two ends of the guide column 14 are fixedly mounted on the top plate 13 and the fixed plate 3. The top and bottom ends of the two screw rods 15 are respectively provided with support ends. The upper end of the screw rod 15 passes through the support end and is provided with a synchronous wheel 16. The lower end of the screw rod 15 is fixed to the support end. The upper support end is fixedly set on the top plate 13, and the lower support end is set on the fixed plate 3. The screw rod 15 can rotate relative to the two support ends. A screw nut is screwed on the screw rod 15. The screw nut is fixedly connected to the vibrator push plate 11. The vibrator push plate 11 and the screw rod 15 are screwed together through the screw nut.

[0063] Preferably, a bearing can be selected as the support end, the screw 15 is fixedly connected to the inner ring of the bearing, and the top plate 13 and the fixed template 3 are respectively provided with a receiving groove for receiving the bearing.

[0064] The output end of the aforementioned driving motor 17 is connected to the synchronous wheel 16 through a belt.

[0065] The aforementioned centering block 32 is interference-fitted with the mounting hole 31 .

[0066] Furthermore, a movable template 6 that can be raised and lowered along the Z axis is provided below the fixed template 3. The movable template 6 is used to fix the mold. The mold is divided into an upper mold 7 and a lower mold. The upper mold 7 has a mold hole 71 for installing the centering block 32. The mold hole 71 is interference fit with the centering block 32.

[0067] Furthermore, this embodiment also includes a control system, which is signal-connected to the ultrasonic tool head 21 , the linear module, the drive motor 17 , and the detection unit 5 .

[0068] In this embodiment, the centering block 32 is interference-fitted with the die hole 71 and the mounting hole 31 , the centering block 32 is fixed, and the ultrasonic tool head 21 is adjusted to achieve centering.

[0069] This application also provides another two-dimensional moving mechanism 4, which forms the centering structure for ultrasonic plasticization microinjection in Example 2, referring to Figure 6-8 As shown, the centering block 32 is clearance-matched with the mounting hole 31 , and the two-dimensional moving mechanism 4 is connected to the centering block 32 to adjust the position of the centering block 32 in the mounting hole 31 .

[0070] The two-dimensional movement mechanism 4 includes a slide rail 41B mounted on the fixed plate 3. A slide seat is slidably mounted on the slide rail 41B. A fine-adjustment screw 42B is mounted on the slide seat. The slide seat is self-lockingly mounted on the slide rail 41B. The extension direction of the fine-adjustment screw 42B is perpendicular to the length of the slide rail 41B. The slide seat is threadedly connected to the fine-adjustment screw 42B, and the fine-adjustment screw 42B is adjusted by rotating the fine-adjustment screw 42B. One end of the fine-adjustment screw 42B is a rotating end, and the other end is connected to the centering block 32 via a connector.

[0071] The fine-tuning screws 42B of the two two-dimensional moving mechanisms 4 are arranged at right angles around the mounting hole 31, that is, one slide rail 41B is arranged around the mounting hole 31 along the X-axis direction, and the other slide rail 41B is arranged around the mounting hole 31 along the Y-axis direction.

[0072] The aforementioned supporting unit 1 is provided with a top plate 13, which is arranged above the vibrator push plate 11. A guide column 14 and a screw 15 passing through the vibrator push plate 11 are provided between the top plate 13 and the T-form plate. The screw 15 is screwed to the vibrator push plate 11. There are two guide columns 14 and two screws 15 respectively. The two guide columns 14 and the two screws 15 are arranged diagonally, and the intersection of the diagonals of the two guide columns 14 and the two screws 15 is located on the axis of the conical through hole 12.

[0073] Specifically, the two ends of the guide column 14 are fixedly mounted on the top plate 13 and the fixed plate 3. The top and bottom ends of the two screw rods 15 are respectively provided with support ends. The upper end of the screw rod 15 passes through the support end and is provided with a synchronous wheel 16. The lower end of the screw rod 15 is fixed to the support end. The upper support end is fixedly set on the top plate 13, and the lower support end is set on the fixed plate 3. The screw rod 15 can rotate relative to the two support ends. A screw nut is screwed on the screw rod 15. The screw nut is fixedly connected to the vibrator push plate 11. The vibrator push plate 11 and the screw rod 15 are screwed together through the screw nut.

[0074] Preferably, a bearing can be selected as the support end, the screw 15 is fixedly connected to the inner ring of the bearing, and the top plate 13 and the fixed template 3 are respectively provided with a receiving groove for receiving the bearing.

[0075] The output end of the aforementioned driving motor 17 is connected to the synchronous wheel 16 through a belt.

[0076] Furthermore, this embodiment also includes a control system, which is signal-connected to the ultrasonic tool head 21 , the drive motor 17 , and the detection unit 5 .

[0077] In this embodiment, a movable template 6 that can be raised and lowered along the Z axis is also provided below the fixed template 3. The movable template 6 is used to install the mold. The mold is divided into an upper mold 7 and a lower mold. The upper mold 7 includes a mold hole 71 that is interference-connected with the centering block 32.

[0078] Based on the centering structures for ultrasonic plasticization microinjection in the two aforementioned embodiments, the present application further provides a centering method, which uses any of the aforementioned centering structures for ultrasonic plasticization microinjection, and includes the following steps:

[0079] S1. The centering block 32 passes through the mounting hole 31 above the fixed template 3;

[0080] In the centering structure for ultrasonic plasticization microinjection of Example 1, the centering block 32 is interference-connected with the mounting hole 31 , and in the centering structure for ultrasonic plasticization microinjection of Example 2, the centering block 32 is clearance-fitted with the mounting hole 31 .

[0081] S2. Assemble the ultrasonic module 2 and fix the ultrasonic module 2 in the conical through hole 12.

[0082] Specifically, a semi-ring 24 is used to enclose both sides of the ultrasonic tool head 21 to form a limiting ring, and the side of the semi-ring groove 241 is ensured to fit the side of the convex shoulder of the ultrasonic tool head 21, and the ultrasonic tool head 21 with the limiting ring is placed in the conical through hole 12 to limit the radial movement of the ultrasonic tool head 21, and the pressure block 22 is inserted into the insertion space to ensure that the pressure block 22 is tightly pressed against the limiting ring and the upper surface of the convex shoulder of the ultrasonic tool head 21, and finally the pressure ring 23 is set above the pressure block 22 and the limiting ring, and the pressure ring 23 is bolted to the vibrator push plate 11 to press the limiting ring, the pressure block 22 and the ultrasonic tool head 21 into the conical through hole 12.

[0083] S3 . Adjust the initial position of the ultrasonic tool head 21 on the Z axis so that the ultrasonic tool head 21 and the centering block 32 are located within the detection range of the detection unit 5 .

[0084] S4. Adjust the two-dimensional moving mechanism 4 until the centering block 32 and the ultrasonic tool head 21 are aligned.

[0085] In the centering structure for ultrasonic plasticization microinjection provided in the first embodiment, the position of the ultrasonic tool head 21 is controlled by adjusting the telescopic length of the linear module. Specifically, the displacement adjustment threshold ΔL is set according to the stroke size of the linear module, and the accuracy range ΔQ of the centering accuracy requirement of the ultrasonic tool head 21 is set. The detection unit 5 respectively captures images of the ultrasonic tool head 21 and the centering block 32 in the X-axis direction and the Y-axis direction, and performs boundary contour line analysis on the ultrasonic tool head 21 and the centering block 32, fitting to form the center line of the ultrasonic tool head 21 and the centering block 32, comparing the deviation of the two center lines and obtaining specific deviation values ​​ΔX and ΔY. When |ΔX|>ΔL or |ΔY|>ΔL, an alarm is issued, and the user checks whether the installation of each component is correct and repeats step S3 until |ΔX|<ΔL and |ΔY|<ΔL.

[0086] When |ΔX| < ΔL and |ΔY| < ΔL, X-axis adjustment is performed, driving the linear module that moves the first movable plate 43A to move, thereby reducing ΔX. Simultaneously, detection unit 5 collects and processes the positions of the two center lines, calculating the real-time ΔX value. When |ΔX| ≤ ΔQ, the linear module stops moving. Once X-axis adjustment is complete, the same method is used to complete the X-axis adjustment.

[0087] During the adjustment process in the X and Y axis directions, the positive and negative values ​​of ΔX and ΔY indicate the deviation direction of the two center lines of the ultrasonic tool head 32 and the centering block 32 in the X and Y directions, respectively representing the extension or shortening of the linear module.

[0088] The centering method in the centering structure for ultrasonic plasticization microinjection provided in the second embodiment is similar. Specifically, an accuracy range ΔQ is set according to the centering requirements of the ultrasonic tool head 21. The detection unit 5 captures images of the ultrasonic tool head 21 and the centering block 32 in the X-axis and Y-axis directions, performs boundary contour analysis on the captured images, fits the center lines of the ultrasonic tool head 21 and the centering block 32, and compares the deviations of the two center lines to calculate the specific deviation values ​​ΔX and ΔY. For ease of expression, the slide rail 41B, slide seat, and fine-tuning screw 42B in the X-axis direction are defined as the first slide rail, first slide seat, and first fine-tuning screw, and the slide rail 41B, slide seat, and fine-tuning screw 42B in the Y-axis direction are defined as the second slide rail, second slide seat, and second fine-tuning screw.

[0089] When adjusting the deviation in the X-axis direction, first adjust the position of the second slide on the second slide rail, and the detection unit 5 feeds back the immediate ΔX. When ΔX|<ΔQ, it means that the centering accuracy requirement in the X-axis direction has been met; when |ΔX|>ΔQ, it means that the centering accuracy requirement in the X-axis direction has not been met. At this time, it is necessary to adjust the length of the first fine-tuning screw on the first slide until |ΔX|<ΔQ.

[0090] The method for adjusting the deviation in the Y-axis direction is the same as that for adjusting the deviation in the X-axis direction. Preferably, when |ΔX|<ΔQ, the control system may issue an alarm to prompt the operator.

[0091] S5. Place the mold on the movable platen 6 and insert the centering block 32 into the mold hole 71 , so that the mold hole 71 and the centering block 32 are interference fit.

[0092] Specifically, the mold is divided into an upper mold 7 and a lower mold, wherein the upper end face of the upper mold 7 is provided with a mold hole 71. The upper mold 7 is set below the fixed mold plate 3, and the centering block 32 is inserted into the mold hole 71 with interference fit, and then the movable mold plate 6 is raised and lowered to achieve mold closing.

[0093] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A centering structure for ultrasonic plasticization microinjection, characterized in that: include: A support unit (1) includes a vibrator push plate (11), the vibrator push plate (11) can be raised and lowered in the Z-axis direction, and an inverted conical through hole (12) is provided at the center of the vibrator push plate (11); An ultrasonic module (2) comprises an ultrasonic tool head (21), a limiting ring, a pressure block (22) and a pressure ring (23), wherein the limiting ring is formed by butting two half rings (24), the outer surface of the half ring (24) having an inclined surface adapted to the shape of the conical through hole (12), the inner surface of the half ring (24) forming a semi-annular groove (241) arranged along the circumferential direction, the semi-annular groove (241) being used to fit with the side surface of the convex shoulder of the ultrasonic tool head (21), the half ring (24) forming a shoulder (242) above the semi-annular groove (241), forming an insertion space between the shoulder (242) and the ultrasonic tool head (21), and the L-shaped pressure block (22) being inserted into the insertion space and abutting against the upper surface of the shoulder (242); The pressure ring (23) is pressed onto the upper surface of the limiting ring and the pressure block (22) and is fixedly connected to the vibrator push plate (11); A fixed template (3) is arranged below the vibrator push plate (11), a mounting hole (31) is provided at the center of the fixed template (3), and a centering block (32) is provided in the mounting hole (31); A two-dimensional moving mechanism (4) for adjusting the coaxiality between the centering block (32) and the ultrasonic tool head (21); A detection unit (5) is provided on the fixed template (3) and is used to detect the coaxiality between the centering block (32) and the ultrasonic tool head (21); The centering block (32) is clearance-matched with the mounting hole (31), and the two-dimensional moving mechanism (4) is connected to the centering block (32) to adjust the position of the centering block (32) in the mounting hole (31).

2. The centering structure for ultrasonic plasticization microinjection according to claim 1, characterized in that: The support unit (1) is further provided with a top plate (13), the top plate (13) being arranged above the vibrator push plate (11), a guide column (14) and a screw rod (15) passing through the vibrator push plate (11) being arranged between the top plate (13) and the fixed template (3), the screw rod (15) being screwed to the vibrator push plate (11), two guide columns (14) and two screw rods (15) being respectively provided, the two guide columns (14) and the two screw rods (15) being arranged diagonally, a synchronous wheel (16) being respectively provided above the two screw rods (15), and a rotating wheel (16) being arranged below the fixed template (3), a driving motor (17) being further provided on the top plate (13), and an output end of the driving motor (17) being belt-driven with the synchronous wheel (16).

3. The centering structure for ultrasonic plasticization microinjection according to claim 2, characterized in that: The two-dimensional moving mechanism (4) comprises a slide rail (41B) provided on the fixed template (3), the slide rail (41B) being provided with a fine-tuning screw (42B) perpendicular to the length direction of the slide rail (41B), and the fine-tuning screw (42B) moving in a direction perpendicular to the length direction of the slide rail (41B); The fine-tuning screws (42B) of the two two-dimensional moving mechanisms (4) are arranged at right angles around the mounting hole (31), and the fine-tuning screws (42B) are fixedly connected to the centering block (32).

4. The centering structure for ultrasonic plasticization microinjection according to claim 3, characterized in that: A movable die plate (6) for accommodating the die is further provided below the fixed die plate (3), and an upper die plate (7) of the die is provided with a die hole (71) that is interference-fitted with the centering block (32).

5. A centering method, using the centering structure for ultrasonic plasticization microinjection according to claim 4, characterized in that: The following steps are included: S1. Install the centering block (32) on the mounting hole (31), and the centering block (32) and the mounting hole (31) are clearance-matched; S2. Assembling the ultrasonic module (2) and fixing the ultrasonic module (2) in the conical through hole (12); S3. Adjusting the initial position of the ultrasonic tool head (21) on the Z axis so that the ultrasonic tool head (21) and the centering block (32) are within the detection range of the detection unit (5); S5. Adjust the two-dimensional moving mechanism (4) until the centering block (32) and the ultrasonic tool head (21) are aligned; S6. Place the mold on the movable mold plate (6), and insert the centering block (32) into the mold hole (71), so that the mold hole (71) and the centering block (32) are interference fit.

6. The centering method according to claim 5, characterized in that: In step S2, two half rings (24) are firstly used to surround the ultrasonic tool head (21) at the convex shoulder of the ultrasonic tool head (21), and the side surface of the half ring groove (241) is in contact with the side surface of the convex shoulder. Then, the ultrasonic tool head (21) with the limiting ring is placed in the conical through hole (12), and after the pressure block (22) is inserted into the insertion space, the limiting ring and the pressure block are axially fixed by the pressure ring (23).

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