Injection molding part glue inlet milling machine

Abstract

The application belongs to the field of injection molding part processing, and particularly discloses an injection molding part glue inlet milling machine, which comprises a positioning mechanism and a milling mechanism, the milling mechanism comprises a milling cutter, and the positioning mechanism comprises a positioning table for placing workpieces; the milling mechanism further comprises a processing cover sleeved outside the milling cutter, the processing cover comprises a fixed part and a sliding part axially and slidingly connected to the fixed part, an elastic member is fixed between the sliding part and the fixed part, the milling cutter is installed on the fixed part, the outer wall of the sliding part is provided with a notch, the notch comprises an inclined surface, the lower end of the inclined surface is flush with the lower end of the sliding part and is inclined toward the inner wall of the sliding part, a filling block for supplementing the notch is detachably connected to the inclined surface, and a pressure sensor is installed on the end of the filling block away from the inclined surface and the side of the inner wall of the sliding part toward the filling block. The scheme can solve the problem of inaccurate positioning of the glue inlet.

Description

Technical Field

[0001] This invention belongs to the field of injection molding parts processing, and specifically relates to a milling machine for injection molding parts gates. Background Technology

[0002] After injection molding, the surface of the initially molded part will retain residual material from the injection gate. This residual material needs to be milled or ground off. For example, patent CN202022220729.3 discloses a fully automatic milling device for residual material removal from the injection molded part, which uses a robotic arm to drive a cutting tool to mill the residual material. In existing technologies, such as... Figure 1 As shown, the gate waste 2 usually has two types of settings: (1) a protrusion on the plane of the injection molded part 1 (such as...) Figure 1 (1) As shown on the left side of the middle part); (2) A protrusion provided in the groove 3 on the surface of the injection molded part 1.

[0003] Since the gate waste 2 is usually small in size, and there may be multiple gate waste 2 locations on the surface of the injection molded part 1, the existing technology usually controls the path of the robotic arm through a program so that the machining tool can move to the designated position for milling. However, this requires very precise placement of the gate waste 2 when the injection molded part 1 is clamped, so that the machining tool can mill away the gate waste 2 when it moves to that location. Especially when the gate waste 2 is a protrusion located in the groove 3 on the surface of the injection molded part 1, the movement of the machining tool and the position of the gate waste 2 need to be precisely controlled. Otherwise, the machining tool may easily mill into the inner wall of the groove 3. This results in high requirements for the clamping of the injection molded part 1 and the motion program settings of the robotic arm, and the cost is even higher when there are many types of injection molded parts 1 to be processed. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a milling machine for injection molded parts' injection gates, which solves the problem that existing technologies have high requirements for clamping injection molded parts and setting the motion program of the robotic arm, and the cost is even higher when there are many types of injection molded parts to be processed.

[0005] According to embodiments of the present invention, the present invention adopts the following technical solution:

[0006] The injection molding part gate milling machine includes a positioning mechanism and a milling mechanism. The milling mechanism includes a milling cutter, and the positioning mechanism includes a positioning table for placing the workpiece. The milling mechanism also includes a processing cover sleeved on the outside of the milling cutter. The processing cover includes a fixed part and a sliding part slidably connected to the fixed part along the axial direction of the fixed part. An elastic element is fixed between the sliding part and the fixed part. The milling cutter is mounted on the fixed part, and the lower end of the milling cutter is flush with the lower end of the fixed part, or the position height of the lower end of the milling cutter is lower than the position height of the lower end of the fixed part. The lower part of the outer wall of the sliding part is provided with a notch, and the notch includes a slope. The lower end of the slope is flush with the lower end of the sliding part and slopes towards the inner wall of the sliding part. A filler block for filling the notch is detachably connected to the slope. Pressure sensors are installed on the end of the filler block facing away from the slope and on the side of the lower inner wall of the sliding part facing the filler block.

[0007] Compared with the prior art, the present invention has the following beneficial effects:

[0008] 1. When the sprue waste is on a flat surface, expose the notch for use. The robotic arm moves the processing cover to the vicinity of the sprue waste, then drives the processing cover downwards, causing the lower end of the sliding part to contact the surface of the injection molded part. The processing cover continues to move laterally, causing the inclined surface to contact the sprue waste, pushing the sliding part upwards until its lower end is suspended in the air. Then, the sliding part moves downwards under its own weight, securing the sprue waste inside the sliding part. The processing cover continues to move until the pressure sensor on the lower part of the sliding part's inner wall abuts against the side of the sprue waste, at which point the movement stops, and milling can begin.

[0009] 2. When the waste material at the inlet is inside the groove, the filler block is used to fill the gap. The machining cover is driven downwards by the robotic arm, causing the first spring to contract to a certain extent. Since the waste material at the inlet is inside the groove, the lower end of the sliding part will also move above the waste material when it reaches it. Only when the lower end of the sliding part is completely above the groove and suspended in the air will the sliding part slide downwards under its own weight, covering the waste material inside the sliding part. The machining cover continues to move. When the pressure sensor on the filler block abuts against the inner wall of the groove, the movement stops, and milling can begin.

[0010] In both of the above processing scenarios, the processing cover is first moved to the vicinity of the injection gate waste. Then, the pressure signal sensed by the pressure sensor is used for further precise positioning to facilitate accurate milling of the injection gate waste. This eliminates the need for highly precise clamping of the injection molded part and high-precision setting of the robotic arm's motion program, and is applicable to processing injection gate waste in various situations. Furthermore, by covering the injection gate waste with the processing cover before processing, it can, to some extent, prevent the debris generated during processing from flying everywhere. Attached Figure Description

[0011] Figure 1This is a schematic diagram of the structure of the waste material at the glue inlet in the background art of this invention.

[0012] Figure 2 This is a schematic diagram of the overall structure of the milling mechanism in an embodiment of the present invention.

[0013] Figure 3 This is a schematic diagram of the overall structure of an embodiment of the present invention.

[0014] Figure 4 This is a top view of the processing cover in an embodiment of the present invention.

[0015] In the diagram: 1. Injection molded part; 2. Inlet waste material; 3. Groove; 4. Fixing part; 5. Mounting plate; 6. Distance sensor; 7. Slide plate; 8. Push rod; 9. Rotating shaft; 10. Connecting block; 11. First spring; 12. First slide groove; 13. Sliding part; 14. Milling cutter; 15. Filler block; 16. Pressure sensor; 17. Slider; 18. First wedge surface; 19. Slide rod; 20. Third spring; 21. Third slide groove; 22. Limiting block; 23. Second wedge surface; 24. Inclined surface; 25. Positioning post; 26. Positioning platform; 27. Pressure plate; 28. Assembly plate; 29. ​​Extension plate. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to the accompanying drawings, and specific embodiments are given.

[0017] like Figure 2 , Figure 3 As shown, the injection molding part gate milling machine includes a positioning mechanism and a milling mechanism. The milling mechanism includes a milling cutter 14, a processing cover sleeved on the outside of the milling cutter 14, and a robotic arm for driving the processing cover to move. The robotic arm can refer to the design of a four-axis robotic arm or a six-axis robotic arm that can move in multiple directions in the prior art, as long as it can drive the processing cover to move.

[0018] The processing cover includes a fixed part 4 and a sliding part 13 slidably connected to the fixed part 4 along the axial direction of the fixed part 4. An elastic element is fixed between the sliding part 13 and the fixed part 4. Specifically, the fixed part 4 has a first sliding groove 12, and a connecting block 10 is fixed to the side wall of the sliding part 13 and slidably connected in the first sliding groove 12. The elastic element is a first spring 11, which is fixed between the connecting block 10 and the top of the first sliding groove 12. The upper end of the fixed part 4 is detachably connected to the robotic arm. Specifically, a connecting plate is fixed to the upper end of the fixed part 4, and the connecting plate is bolted to the robotic arm to facilitate the installation, removal, and replacement of the processing cover or the robotic arm.

[0019] The milling cutter 14 is mounted on the fixed part 4. Specifically, a mounting plate 5 is fixed to the inner wall of the fixed part 4, and a sliding plate 7 is slidably connected to the mounting plate 5. A rotating shaft 9 is rotatably connected to the lower end of the sliding plate 7. The milling cutter 14 is fixed to the lower end of the rotating shaft 9. A cylinder for driving the sliding plate 7 to slide is mounted on the mounting plate 5, and a micro motor for driving the rotating shaft 9 to rotate is mounted on the sliding plate 7. The position of the rotating shaft 9 is adjusted by sliding the sliding plate 7, and the rotation of the rotating shaft 9 drives the milling cutter 14 to rotate, thus completing the milling. The lower end of the milling cutter 14 is flush with the lower end of the fixed part 4, or the position height of the lower end of the milling cutter 14 is lower than the position height of the lower end of the fixed part 4, so as to avoid interfering with the downward movement of the milling cutter 14 when the lower end of the fixed part 4 is in contact with the surface of the injection molded part 1.

[0020] The lower part of the outer wall of the sliding part 13 has a notch, which includes an inclined surface 24. The lower end of the inclined surface 24 is flush with the lower end of the sliding part 13 and slopes towards the inner wall of the sliding part 13. A filling block 15 for filling the notch is detachably connected to the inclined surface 24. Specifically, the filling block 15 is connected to the inclined surface 24 by countersunk bolts. Pressure sensors 16 are installed on the end of the filling block 15 facing away from the inclined surface 24 and on the side of the lower inner wall of the sliding part 13 facing the filling block 15. Specifically, Figure 2 Taking the direction shown as an example, a pressure sensor 16 is installed on the right side of the filling block 15, and a pressure sensor 16 is installed on the lower part of the inner wall on the left side of the sliding part 13. The pressure sensor 16 is a sensor that can sense pressure signals in the prior art.

[0021] The positioning mechanism includes a positioning table 26 for placing the workpiece, and a plurality of positioning pins 25 slidably connected vertically to the positioning table 26, and a cylinder mounted on the positioning table 26 for driving the positioning pins 25 to slide. The positioning pins 25 are used to lock onto the inner wall or outer wall of the injection molded part 1 to limit the position of the injection molded part 1. Figure 3 The image shows the positioning post 25 being engaged at the outer wall of the injection molded part 1, thus limiting the position of the injection molded part 1. In actual use, the positioning post 25 can be slid to different positions according to different models or sizes of the injection molded part 1, so that the positioning post 25 can be engaged at the outer or inner wall of the injection molded part 1.

[0022] In practical use, there are the following two scenarios:

[0023] 1. When the waste material 2 at the inlet is on a flat surface, expose the notch for use.

[0024] Milling Figure 3Taking the inlet waste 2 shown on the left as an example, firstly, adjust the position of the slide plate 7 according to the model of the injection molded part 1 to be processed. Then, the robotic arm drives the processing cover to move from left to right to the vicinity of the inlet waste 2, and then drives the processing cover to move downward, so that the lower end of the sliding part 13 is in contact with the surface of the injection molded part 1. Then, it continues to move to the right, and the inclined surface 24 contacts the inlet waste 2. The side wall of the inlet waste 2 will push the sliding part 13 to slide upward. The first spring 11 is compressed, and the lower right side of the sliding part 13 is located above the inlet waste. Continue to drive the processing cover to move to the right until the lower end of the sliding part 13 is completely suspended. The sliding part 13 moves downward under its own weight and the restoring force of the first spring 11, covering the inlet waste 2 inside the sliding part 13. Continue to drive the processing cover to move to the right. When the pressure sensor 16 on the lower part of the left inner wall of the sliding part 13 abuts against the side of the inlet waste 2, the movement stops. Then, the mechanical arm drives the fixed part 4 to move downward, and the mounting plate 5 drives the rotating shaft 9 to move downward, driving the rotating shaft 9 to rotate, thus completing the milling of the waste material 2 at the glue inlet.

[0025] 2. When the waste material 2 at the glue inlet is in the groove 3, the filler block 15 is used to fill the gap.

[0026] Milling Figure 3 Taking the inlet waste 2 shown on the right as an example, first, the filler block 15 is bolted to the inclined surface 24. Then, the position of the slide plate 7 is adjusted according to the model of the injection molded part 1 to be processed. The processing cover is driven downward by the robotic arm, causing the first spring 11 to contract to a certain extent. Then, the processing cover is driven to move to the right. Since the inlet waste 2 is in the groove 3, when the lower end of the sliding part 13 moves to the inlet waste 2, it will also move above the inlet waste 2. Only when the lower end of the sliding part 13 is completely above the groove 3 and suspended in the air, the sliding part 13 slides downward under its own weight and the restoring force of the first spring 11, covering the inlet waste 2 inside the sliding part 13. The processing cover is driven to move to the right. When the pressure sensor 16 on the filler block 15 abuts against the inner wall of the groove 3, the movement stops. Then, the fixing part 4 is driven downward by the robotic arm, and the mounting plate 5 drives the rotating shaft 9 to move downward, driving the rotating shaft 9 to rotate, completing the milling of the inlet waste 2.

[0027] In another embodiment of the invention, combined with Figure 4 As shown, in this embodiment, both the fixing part 4 and the sliding part 13 include a plurality of assembly plates 28, and both are connected end to end in a ring shape by multiple assembly plates 28. An extension plate 29 is slidably connected between adjacent assembly plates 28. Figure 4Taking the example of two assembly plates 28, the assembly plates 28 are C-shaped and form a rectangular ring. Each end of the two assembly plates 28 has a second sliding groove. An extension plate 29 is slidably connected within the second sliding groove. A cylinder is fixed to one of the assembly plates 28, and the cylinder's output shaft is fixed to the other assembly plate 28. By sliding the extension plate 29, the overall size of the processing cover can be adjusted to accommodate the processing of waste material 2 from different sized inlet ports.

[0028] In another embodiment of the present invention, a distance sensor 6 for detecting the position of the sliding part 13 is installed on the fixing part 4. The distance sensor 6 is a sensor that can detect the distance between the two in the prior art. In this embodiment, by setting the distance sensor 6, it can be determined whether the first spring 11 is in a compressed state when the lower end of the sliding part 13 is in contact with the surface of the injection molded part 1. In particular, when the waste material 2 of the inlet is located in the groove 3, the first spring 11 needs to be in a compressed state when the lower end of the sliding part 13 is in contact with the surface of the injection molded part 1. Otherwise, when the sliding part 13 is suspended above the groove 3, it cannot cover the waste material 2 of the inlet by its own weight.

[0029] In another embodiment of the present invention, a slider 17 for mounting a pressure sensor 16 is slidably connected to the lower side of the inner wall of the sliding part 13. A slider rod 19 is fixed on the slider 17. A third groove 21 for the slider 17 to be inserted is provided on the inner wall of the sliding part 13. The slider rod 19 is slidably connected in the third groove 21. The end of the slider rod 19 extends out of the sliding part 13 and is fixed with a limit block 22. A third spring 20 is fixed between the slider 17 and the inner wall of the third groove 21. A first wedge surface 18 is provided on the upper side of the free end of the slider 17. A push rod 8 for pushing the slider 17 is fixed on the mounting plate 5. Specifically, the lower end of the push rod 8 is provided with a second wedge surface 23 that cooperates with the first wedge surface 18. The lower end of the push rod 8 is flush with the lower end of the milling cutter 14.

[0030] In practical use, when the pressure sensor 16 on the slider 17 abuts against the side wall of the inlet waste 2, the robotic arm stops its lateral movement and drives the fixed part 4 to move downward. When the second wedge surface 23 at the lower end of the push rod 8 and the first wedge surface 18 on the slider 17 cooperate with each other, the push rod 8 pushes the slider 17 away, causing the slider 17 to move towards the third slide groove 21, thus preventing the slider 17 from interfering with the movement of the milling cutter 14. In actual use, the sensing signal threshold of the pressure sensor 16 on the slider 17 should be set relatively low to promptly determine and stop the lateral movement of the robotic arm, thereby preventing the inlet waste 2 from directly pushing the slider 17 to slide.

[0031] In another embodiment of the present invention, a pressure plate 27 is rotatably connected to the positioning post 25. The longitudinal section of the pressure plate 27 is an isosceles triangle, and a groove for the pressure plate 27 to be embedded is provided on the positioning platform 26.

[0032] In practical use, by rotating the pressure plate 27, it presses against the upper end of the surface of the injection molded part 1, further limiting the position of the injection molded part 1. To avoid interference with the lateral movement of the processing cover, the longitudinal section of the pressure plate 27 is an isosceles triangle, allowing the lower end of the sliding part 13 to move along the inclined surface of the pressure plate 27. That is, when the sliding part 13 passes through the pressure plate 27, it retracts slightly into the fixed part 4, and the first spring 11 contracts, allowing the sliding part 13 to pass through the pressure plate 27. The unused positioning post 25 has its pressure plate 27 embedded in the groove on the positioning table 26, avoiding interference with the placement of the injection molded part 1.

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A milling machine for injection molded parts' gates, comprising a positioning mechanism and a milling mechanism, wherein the milling mechanism includes a milling cutter, and the positioning mechanism includes a positioning table for placing the workpiece; characterized in that: The milling mechanism also includes a processing cover sleeved on the outside of the milling cutter. The processing cover includes a fixed part and a sliding part slidably connected to the fixed part along the axial direction of the fixed part. An elastic element is fixed between the sliding part and the fixed part. The milling cutter is mounted on the fixed part, and the lower end of the milling cutter is flush with the lower end of the fixed part, or the position height of the lower end of the milling cutter is lower than the position height of the lower end of the fixed part. The lower part of the outer wall of the sliding part is provided with a notch. The notch includes an inclined surface. The lower end of the inclined surface is flush with the lower end of the sliding part and inclined towards the inner wall of the sliding part. A filling block for filling the notch is detachably connected to the inclined surface. Pressure sensors are installed on the end of the filling block facing away from the inclined surface and on the side of the lower inner wall of the sliding part facing the filling block. The two pressure sensors are located on opposite sides of the sliding part.

2. The injection molding part gate milling machine according to claim 1, characterized in that: Both the fixed part and the sliding part include several assembly plates, and they are all connected end to end in a ring shape by multiple assembly plates, with extension plates slidably connected between adjacent assembly plates.

3. The injection molding part gate milling machine according to claim 1, characterized in that: A distance sensor for detecting the position of the sliding part is installed on the fixed part.

4. The injection molding part gate milling machine according to claim 1, characterized in that: The milling mechanism includes a robotic arm, with the upper end of the fixed part detachably connected to the robotic arm.

5. The injection molding part gate milling machine according to claim 1, characterized in that: The milling mechanism includes a mounting plate fixed to the inner wall of the fixed part, a sliding plate slidably connected to the mounting plate, and a rotating shaft rotatably connected to the sliding plate, with the milling cutter fixed on the rotating shaft.

6. The injection molding part gate milling machine according to claim 5, characterized in that: A slider for mounting a pressure sensor is slidably connected to the lower side of the inner wall of the sliding part. A first wedge surface is provided on the upper side of the free end of the slider. A push rod for pushing the slider is fixed on the mounting plate. A second wedge surface that cooperates with the first wedge surface is provided at the lower end of the push rod. The lower end of the push rod is flush with the lower end of the milling cutter.

7. The injection molding part gate milling machine according to claim 1, characterized in that: The positioning mechanism includes multiple positioning columns that are slidably connected to the positioning platform along the vertical direction. The positioning columns are used to lock onto the inner wall or outer wall of the injection molded part to limit its position.

8. The injection molding part gate milling machine according to claim 7, characterized in that: A pressure plate is rotatably connected to the positioning column, and the longitudinal section of the pressure plate is an isosceles triangle; a groove for embedding the pressure plate is provided on the positioning platform.

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