Engine air intake noise reduction pipe mold

Abstract

The present invention discloses a mold for an engine air intake noise reduction pipe, comprising: a front mold assembly, which includes an A plate, a sliding seat, a fixed mold slider and a core rod; a rear mold assembly, which includes a B plate, a movable mold slider, a movable insert, a fixed rod and a mold core; when the mold is closed, the movable mold slider and the mold core are combined to form a fixed space for fixing the sound-absorbing material, and the core rod and the movable mold slider collide to form a fixed space for fixing the metal insert; when the mold is opened, the fixed mold slider performs an oblique core pulling action until the fixed mold slider is separated from the noise reduction pipe, the core rod is separated from the metal insert, the movable mold slider performs a lateral core pulling action, and the movable mold slider drives the movable insert to perform an oblique core pulling action until it is separated from the boss. The present invention provides an engine air intake noise reduction pipe mold. The structure effectively solves the undercut problem caused by the boss design by arranging a movable mold slider, a movable insert and a fixed rod, and utilizing the oblique cooperation between the movable insert and the movable mold slider, thereby ensuring smooth demolding of the injection molded parts.

Description

Technical Field

[0001] The invention relates to the technical field of molds, and more specifically to an engine air intake noise reduction pipe mold. Background Art

[0002] With the improvement of modern automobile engine performance, noise control of the intake system has become an important part of improving riding comfort and meeting environmental protection requirements. As a key component for reducing engine intake noise, the design and manufacturing technology of the engine intake noise reduction pipe has received more and more attention. Figure 1-2 As shown, the noise reduction pipe is composed of an injection molded part, a sound absorbing material and a metal insert. A bent flange is designed at one end of the injection molded part of the noise reduction pipe for fixing with other system components of the automobile.

[0003] The sound-absorbing material is embedded in the injection molded part in the form of insert injection molding to optimize the noise absorption performance. In order to enhance the connection strength of the flange part, a metal insert is usually injected into the flange part. The axial length of the metal insert is usually greater than the wall thickness of the flange part, so a boss is designed on the back of the flange part corresponding to the position of the metal insert to solve the problem of metal insert embedding.

[0004] However, although the design of the boss enhances the connection strength of the flange, it also brings challenges to the design of the injection mold. In particular, the presence of the boss causes the mold to form an undercut structure during the mold opening process, which increases the complexity of the mold design and the difficulty of manufacturing. Summary of the invention

[0005] The present invention aims to solve one of the technical problems in the related art to a certain extent. To this end, the present invention proposes an engine air intake noise reduction pipe mold, which effectively solves the undercut problem caused by the boss design by setting a movable mold slider, a movable insert and a fixed rod, and utilizes the oblique cooperation between the movable insert and the movable mold slider, ensuring smooth demolding of the injection molded parts and avoiding mold jamming and demolding difficulties.

[0006] The technical solution adopted by the present invention is to provide an engine air intake noise reduction pipe mold, comprising:

[0007] The front mold assembly includes an A plate, a slide seat, a fixed mold slider and a core rod, wherein the slide seat is slidably mounted on the A plate, the fixed mold slider is slidably mounted on the inclined surface of the slide seat, so that the fixed mold slider follows the lateral movement of the slide seat to perform an oblique core pulling movement, and the core rod is fixedly mounted on the fixed mold slider, and the core rod is adapted to the inner hole of the metal insert;

[0008] A rear mold assembly, comprising a B plate, a pair of movable mold sliders, a pair of movable inserts, a pair of fixed rods and a mold core, wherein the mold core is fixedly installed at the center of the B plate, the pair of movable mold sliders, the movable inserts and the fixed rods are symmetrically arranged on both sides of the mold core, the fixed rods are located outside the movable mold sliders and are fixed relative to the lateral position of the B plate, the movable inserts are obliquely matched with the movable mold sliders, the inner ends of the movable inserts are the molding ends embedded in the movable mold sliders, and the outer ends are slidably connected to the fixed rods through the oblique through holes on the B plate, and the movable inserts have molding portions for molding bosses;

[0009] When the mold is closed, the movable mold slider and the mold core are combined to form a fixed space for fixing the sound absorbing material, the core rod and the movable mold slider collide with each other to form a fixed space for fixing the metal insert, the fixed mold slider collide with each other, and the movable mold slider, the mold core, the movable insert and the fixed mold slider are combined to form a cavity for forming the noise reduction pipe;

[0010] When the mold is opened, the fixed mold slider performs an oblique core pulling action until the fixed mold slider is separated from the noise reduction tube, the core rod is separated from the metal insert, the movable mold slider performs a lateral core pulling action, and the movable mold slider drives the movable insert to perform an oblique core pulling action until it is separated from the boss.

[0011] After adopting the above structure, the undercut problem caused by the boss design is solved. The oblique core-pulling movement of the fixed mold slider and the slide in the front mold assembly ensures the smooth demolding of the injection molded part and the front mold assembly, avoiding the interference of the front mold assembly with the oblique demolding of the flange. When the movable mold slider moves sideways to perform the lateral core-pulling action, due to the oblique cooperation between the movable insert and the movable mold slider, the lateral movement of the movable mold slider is the oblique movement of the movable insert, in which the movable insert moves obliquely along the axial direction of the metal insert, making the boss molding more precise and avoiding mold jamming or demolding difficulties caused by the boss design.

[0012] In addition, the design of the core rod and the adaptability of the inner hole of the metal insert, as well as the penetration of the core rod and the movable mold slider ensure that the metal insert does not shift during the injection molding process, ensuring that the metal insert is accurately embedded in the flange part during the injection molding process.

[0013] According to one embodiment of the present invention, the front mold assembly further includes a positioning ring and a nozzle, and a pair of movable mold sliders are provided with a half gate on the opposite side, and the combination of the two half gates is connected to the nozzle when the mold is closed; the two half gates are located on the opposite side of the pair of movable mold sliders, and the combination of the two half gates is connected to the nozzle when the mold is closed, ensuring that the molten material flows evenly into the mold cavity. When the mold is opened, the two movable mold sliders move in a classified manner to effectively separate the gate area, so that the excess material in the gate is easy to remove, avoiding material residue and molding defects, and further improving the production efficiency of the mold and the molding quality of the injection molded parts.

[0014] According to one embodiment of the present invention, the fixed rod is provided with an inclined slide groove, the outer end of the movable insert is provided with an inclined sliding block, and the inclined sliding block is slidably matched with the inclined slide groove. When the movable mold slider drives the movable insert to move obliquely, the movable insert slides along the inclined slide groove, thereby ensuring the precise positioning and smooth movement of the movable insert, and avoiding mold jamming or poor molding due to uneven movement.

[0015] According to one embodiment of the present invention, a fixing block is elastically mounted on the bottom plate of the rear mold assembly, and the lower end of the fixing rod is fixedly mounted between the fixing block and the movable mold slider; the fixing block restricts the fixing rod between the fixing block and the movable mold slider to restrict the lateral movement of the fixing rod and prevent it from driving the movable insert to move laterally.

[0016] According to one embodiment of the present invention, a bevel mounting groove is provided at the bottom of the movable mold slider, and the fixed block has a bevel abutting against the bevel mounting groove. When the movable mold slider moves inward, the bevel at the upper end of the fixed block is inserted into the bevel mounting groove to form a limit, thereby playing a role in positioning the movable mold slider. When the movable mold slider performs a lateral core pulling action, the bevel mounting groove pushes the fixed block downward. The downward movement of the fixed block will bring a certain resistance to the lateral movement of the movable mold slider, thereby ensuring that during the injection molding process, the mold can effectively control the stability and accuracy of the core pulling when subjected to a certain pressure, and prevent molding defects or mold damage caused by too fast movement.

[0017] According to an embodiment of the present invention, a slot is provided at the bottom end of the fixing rod, the slot is matched with the fixing block, and when the fixing block moves downward, the fixing block is always located in the slot to limit lateral movement of the fixing rod.

[0018] According to an embodiment of the present invention, a spring is provided between the fixed block and the bottom plate, and the spring has an elastic tendency to keep the fixed block in close contact with the movable mold slider.

[0019] According to an embodiment of the present invention, a protrusion is provided at the bottom end of the fixed rod, and a avoidance structure is provided at the movable mold slider corresponding to the protrusion. The protrusion and the avoidance structure can be slidably matched to play a certain guiding role for the movable mold slider to move relative to the fixed rod.

[0020] According to one embodiment of the present invention, the fixing rod is fixed in a lateral position and is installed on the B plate in a floating manner along the mold opening direction. The fixing rod is provided with a self-locking portion, and the surface of the movable mold slider is provided with a locking groove. When the mold is closed, the A plate pushes the fixing rod downward to allow the self-locking portion to be stuck in the locking groove, thereby realizing the self-locking function between the fixing rod and the movable mold slider. When the mold is opened, the self-locking portion disengages from the locking groove, releases the self-locking, and allows the movable mold slider to perform a lateral core pulling action. The design of the self-locking portion and the locking groove ensures the mold opening sequence, avoids mold damage or molding defects caused by improper operation, and thus improves the safety of the mold and the reliability of the injection molding process.

[0021] According to one embodiment of the present invention, a spring is provided between the fixing rod and the bottom plate of the rear mold assembly, and the spring has an elastic tendency to make the self-locking portion disengage from the locking groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a stereoscopic diagram of the noise reduction tube in Example 1 of the present invention.

[0024] Figure 2 This is an exploded view of the noise reduction tube in Example 1 of the present invention.

[0025] Figure 3 It is a three-dimensional diagram of the front mold assembly in Example 1 of the present invention.

[0026] Figure 4 It is a cross-sectional view of the front mold assembly in Example 1 of the present invention.

[0027] Figure 5 It is a three-dimensional diagram of the fixed mold cylinder, slide seat, mold core and core rod in Example 1 of the present invention.

[0028] Figure 6 It is a three-dimensional diagram of the rear mold assembly in Example 1 of the present invention.

[0029] Figure 7 This is a three-dimensional diagram of the rear mold assembly when opening the mold in Example 1 of the present invention.

[0030] Figure 8 This is a three-dimensional diagram of the movable mold slider when opening the mold in Example 1 of the present invention.

[0031] Fig. 9 It is a stereoscopic diagram of the movable mold slider and the noise reduction tube in Example 1 of the present invention.

[0032] Fig.10 It is a three-dimensional diagram of the noise reduction tube, the fixing rod and the movable insert in Example 1 of the present invention.

[0033] Fig.11 It is a cross-sectional view of the rear mold assembly in Example 1 of the present invention.

[0034] Fig.12 It is a schematic diagram of the structure of the noise reduction tube, the fixing rod and the movable insert in Example 1 of the present invention.

[0035] Fig.13 This is a schematic structural diagram of the bottom of the movable mold slider in Example 1 of the present invention.

[0036] Fig.14 It is a three-dimensional diagram of the movable mold slider in Example 1 of the present invention.

[0037] Fig.15 It is a top view of the movable mold cylinder and the movable mold slider in Example 1 of the present invention.

[0038] Fig.16 for Fig.15 Section view along line AA.

[0039] Fig.17 It is a partial enlarged view of the movable mold slider and the fixed rod in Example 2 of the present invention.

[0040] Fig.18 It is a front view of the fixing rod in Example 2 of the present invention.

[0041] Description of the numbers in the figure:

[0042] 10. Noise reduction pipe; 20. Front mold assembly; 30. Rear mold assembly;

[0043] 11. Injection molded parts; 12. Sound absorbing materials; 13. Metal inserts;

[0044] 11a, flange portion; 11b, boss;

[0045] 21. Plate A; 22. Panel; 23. Positioning ring; 24. Nozzle; 25. Fixed mold oil cylinder; 26. Sliding seat; 27. Fixed mold slide block; 28. Core rod;

[0046] 31. Plate B; 32. Bottom plate; 33. Moving mold cylinder; 34. Moving mold slide block; 35. Fixed rod; 36. Movable insert; 37. Fixed block; 38. Spring; 39. Mold core;

[0047] 34a, half gate; 34b, oblique through hole; 34c, inclined mounting groove; 34d, locking groove;

[0048] 35a, inclined slide groove; 35b, protrusion; 35c, slot; 35d, self-locking part;

[0049] 36a, forming end; 36b, forming portion; 36c, inclined slider. DETAILED DESCRIPTION

[0050] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention. Embodiment 1

[0051] Combination Figure 1-2 As shown, the noise reduction pipe 10 is composed of an injection molded part 11, a sound absorbing material 12 and a metal insert 13. One end of the injection molded part 11 of the noise reduction pipe 10 is a curved pipe structure, and the other end of the noise reduction pipe 10 is a straight pipe structure. A flange portion 11a is provided on the surface of the curved pipe structure, and two fastening holes are provided on the flange portion 11a. The fastening holes are connected by fasteners to fix the noise reduction pipe 10 to other system components of the automobile. A metal insert 13 is embedded in the fastening hole position by insert injection molding, and two bosses 11b are provided on the back of the flange portion 11a. A sound absorbing material 12 is provided at the straight pipe structure position of the noise reduction pipe 10, and the sound absorbing material 12 is embedded in the injection molded part 11 by insert injection molding to optimize the noise absorption performance.

[0052] like Figure 3-16 As shown, in this embodiment, a mold of an engine air intake noise reduction pipe 10 is disclosed, comprising:

[0053] The front mold assembly 20 includes an A plate 21, a slide 26, a fixed mold slider 27 and a core rod 28. The slide 26 is slidably mounted on the A plate 21, and the fixed mold slider 27 is slidably mounted on the inclined surface of the slide 26, so that the fixed mold slider 27 follows the lateral movement of the slide 26 to perform an oblique core pulling movement. The core rod 28 is fixedly mounted on the fixed mold slider 27, and the core rod 28 is adapted to the inner hole of the metal insert 13.

[0054] The rear mold assembly 30 includes a B plate 31, a pair of movable mold sliders 34, a pair of movable inserts 36, a pair of fixed rods 35 and a mold core 39. The mold core 39 is fixedly installed at the center of the B plate 31. The pair of movable mold sliders 34, the movable inserts 36 and the fixed rods 35 are symmetrically arranged on both sides of the mold core 39. The fixed rods 35 are located outside the movable mold sliders 34 and are fixed in a lateral position relative to the B plate 31. The movable inserts 36 are obliquely matched with the movable mold sliders 34. The inner end thereof is a molding end 36a embedded in the movable mold slider 34, and the outer end passes through the oblique through hole 34b on the B plate 31 and is slidably connected to the fixed rods 35. The movable inserts 36 have a molding portion 36b for molding the boss 11b.

[0055] When the mold is closed, the movable mold slider 34 and the mold core 39 are combined to form a fixed space for fixing the sound absorbing material 12, the core rod 28 and the movable mold slider 34 collide with each other to form a fixed space for fixing the metal insert 13, the fixed mold slider 27 and the fixed mold slider 27 collide with each other, and the movable mold slider 34, the mold core 39, the movable insert 36 and the fixed mold slider 27 are combined to form a cavity for molding the noise reduction pipe 10;

[0056] When the mold is opened, the fixed mold slider 27 performs an oblique core pulling action until the fixed mold slider 27 is separated from the noise reduction tube 10, the core rod 28 is separated from the metal insert 13, and the movable mold slider 34 performs a lateral core pulling action, and the movable mold slider 34 drives the movable insert 36 to perform an oblique core pulling action until it is separated from the boss 11b.

[0057] Furthermore, in this embodiment, the front mold assembly 20 also includes a panel 22 and a fixed mold cylinder 25, and the fixed mold cylinder 25 is fixedly installed on one side of the A plate 21. The moving end of the fixed mold cylinder 25 is fixedly connected to the slide 26, and is used to drive the slide 26 to move laterally. The fixed mold slider 27 is slidably matched with the inclined surface of the slide 26, and the fixed mold slider 27 and the slide 26 are combined to form an inclined wedge structure, which prompts the fixed mold slider 27 to perform an oblique core pulling movement to ensure that the injection molded part 11 and the front mold assembly 20 are smoothly demolded. The cooperation between the fixed mold slider 27 and the core rod 28 ensures that the metal insert 13 can be accurately fixed. The rear mold assembly 30 includes a B plate 31, a pair of movable mold sliders 34, a pair of movable inserts 36, a pair of fixed rods 35 and a mold core 39, and a space for fixing the sound absorbing material 12 and the metal insert 13 is formed through precise cooperation to ensure the accuracy and stability of the mold.

[0058] Furthermore, the rear mold assembly 30 further includes a bottom plate 32 and a pair of movable mold oil cylinders 33, the two movable mold oil cylinders 33 are fixedly mounted on both sides of the bottom plate 32, and the moving ends of the two movable mold oil cylinders 33 are respectively fixedly connected to the outer sides of the corresponding movable mold sliders 34, and are used to drive the movable mold sliders 34 to move laterally. In this embodiment, the movable mold sliders 34 have protrusions 35b on the surface of the B plate 31, so that the movable mold sliders 34 are embedded in the mold cavity of the A plate 21 when the mold is closed to limit the lateral movement of the movable mold sliders 34, and the surface of the movable mold sliders 34 in contact with the A plate 21 is provided with wear-resistant blocks.

[0059] Specifically, combined Figure 4 As shown, the front mold assembly 20 also includes a positioning ring 23 and a nozzle 24, and a pair of the movable mold sliders 34 are provided with a half gate 34a on the opposite sides. When the mold is closed, the combination of the two half gates 34a is connected to the nozzle 24.

[0060] Furthermore, the nozzle 24 is mounted on the A plate 21, and the positioning ring 23 is fixedly mounted on the panel 22, and the positioning ring 23 is connected to the nozzle 24. Fig. 9 As shown, the inner side of the movable mold slider 34 is provided with a half gate 34a, and the combination of the two half gates 34a forms a sub-gate structure. When the mold is closed, the upper end of the sub-gate structure is connected to the nozzle 24 to form a runner structure. When the mold is closed, the two movable mold sliders 34 collide with each other and are combined with the mold core 39, the movable insert 36 and the fixed mold slider 27 to form a cavity for molding the noise reduction tube 10. When the mold is opened, the two movable mold sliders 34 move away from each other, and the residual material of the sub-gate is separated.

[0061] During the molding process, the design of the subgate not only helps to control the filling speed of the flowing metal or plastic, but also can effectively avoid the influence of gate residues on the surface quality of the finished product through the separation of the residual material of the subgate. Specifically, when the mold is opened and closed, the separation of the movable mold slider 34 allows the excess material in the subgate to be naturally separated, ensuring that the surface of the molded noise reduction pipe 10 is smooth and has no excess joints. Through this design, the scrap rate in the production process can be reduced, while the precision and appearance quality of the finished product can be improved.

[0062] Specifically, combined Fig.10 As shown, the fixed rod 35 is provided with an inclined slide groove 35a, and the outer end of the movable insert 36 is provided with an inclined slider 36c, and the inclined slider 36c is slidably matched with the inclined slide groove 35a. When the movable mold slider 34 drives the movable insert 36 to move obliquely, the movable insert 36 slides along the inclined slide groove 35a.

[0063] Furthermore, combined with Figure 10-16 As shown, a fixing block 37 is elastically mounted on the bottom plate 32 of the rear mold assembly 30, and the lower end of the fixing rod 35 is fixedly mounted between the fixing block 37 and the movable mold slider 34. The bottom of the movable mold slider 34 is provided with an inclined surface mounting groove 34c, and the fixing block 37 has an inclined surface abutting against the inclined surface mounting groove 34c. When the movable mold slider 34 performs a lateral core pulling action, the inclined surface mounting groove 34c pushes the fixing block 37 to move downward. A clamping groove 35c is provided at the bottom end of the fixing rod 35, and the clamping groove 35c is adapted to the fixing block 37. During the downward movement of the fixing block 37, the fixing block 37 is always located in the clamping groove 35c to limit the lateral movement of the fixing rod 35. A spring 38 is provided between the fixing block 37 and the bottom plate 32, and the spring 38 has an elastic tendency to keep the fixing block 37 in close contact with the movable mold slider 34. The bottom end of the fixing rod 35 is provided with a protrusion 35 b, and the movable mold slider 34 is provided with an avoidance structure corresponding to the position of the protrusion 35 b.

[0064] Furthermore, in this embodiment, the avoidance structure and the card slot 35c are perpendicular to each other in the horizontal direction. The fixed block 37 is elastically installed in the groove of the bottom plate 32, so that the fixed block 37 protrudes 35b on the surface of the bottom plate 32. The lower end of the fixed rod 35 abuts against the bottom plate 32, and the fixed block 37 is clamped into the card slot 35c. The fixed rod 35 is restricted between the movable mold slider 34 and the bottom plate 32. When the mold is closed, there is a gap between the fixed rod 35 and the movable mold slider 34 for the movable mold slider 34 to move. When the mold is opened, the movable mold slider 34 moves sideways, driving the movable insert 36 to move obliquely, and the oblique slider 36c moves obliquely downward along the oblique slide groove 35a.

[0065] Furthermore, in this embodiment, the mold opening sequence is as follows:

[0066] First, the sound absorbing material 12 and the metal insert 13 are placed in the mold and the mold is closed to ensure that the metal insert 13 is correctly placed on the core rod 28. The fixed mold oil cylinder 25 drives the slide 26 to move sideways, driving the fixed mold slider 27 to move obliquely upward, and the movement direction is parallel to the axial direction of the curved pipe part of the noise reduction pipe 10. The fixed mold slider 27 switches from the state of colliding with the mold core 39 to a position away from the mold core 39 until it is completely separated from the noise reduction pipe 10, and the core rod 28 is also separated from the metal insert 13.

[0067] Subsequently, the front mold assembly 20 and the rear mold assembly 30 are opened, and the A plate 21 and the B plate 31 move away from each other to make room for the lateral movement of the movable mold slider 34. Then, the two movable mold oil cylinders 33 simultaneously drive the movable mold slider 34 to move away from each other to ensure that the movable mold slider 34 is separated from the noise reduction tube 10. In this process, the movable mold slider 34 drives the movable insert 36 to move obliquely, and the oblique slider 36c moves obliquely along the oblique slide groove 35a until the molding portion 36b of the movable insert 36 is separated from the boss 11b on the flange portion 11a.

[0068] Finally, the noise reduction tube 10 is removed to ensure that it is smoothly separated from the mold core 39. The waste material at the half gate 34a is attached to the injection molded part 11 of the noise reduction tube 10 and can be cut off after molding. This sequence ensures efficient mold opening and complete molding of the injection molded part 11, while avoiding molding defects caused by improper operation. Embodiment 2

[0069] Combination Figure 17-18 As shown, in Example 1, the fixed rod 35 is fixedly mounted on the bottom plate 32. The difference between this embodiment and Example 1 is that in this embodiment, the fixed rod 35 is fixed in the lateral position and is floatingly mounted on the B plate 31 along the mold opening direction, that is, the fixed rod 35 will not move laterally relative to the movable mold slider 34 or the bottom plate 32, and will only move up and down along the mold opening direction. A spring 38 is provided between the fixed rod 35 and the bottom plate 32, and the spring 38 has an elastic tendency to make the self-locking part 35d disengage from the locking groove 34d. The fixed rod 35 is provided with a self-locking part 35d, and the surface of the movable mold slider 34 is provided with a locking groove 34d. When the mold is closed, the A plate 21 pushes the fixed rod 35 downward to make the self-locking part 35d snap into the locking groove 34d, thereby realizing the self-locking function between the fixed rod 35 and the movable mold slider 34. When the mold is opened, the fixed rod 35 is bounced upward under the action of the spring 38, and the self-locking part 35d disengages from the locking groove 34d to release the self-locking, allowing the movable mold slider 34 to perform a lateral core pulling action. The design of the self-locking portion 35d and the locking groove 34d ensures the mold opening sequence, avoids mold damage or molding defects caused by improper operation, and thus improves the safety of mold use and the reliability of the injection molding process.

[0070] Furthermore, in this embodiment, the fixing block 37 is floatingly mounted on the bottom plate 32, and the fixing block 37 is inserted into the slot 35c at the lower end of the fixing rod 35. The fixing block 37 and the fixing rod 35 are at a vertical angle to limit the lateral movement of the fixing rod 35. The fixing block 37 drives the fixing rod 35 to float up and down along the mold opening direction.

[0071] Furthermore, in this embodiment, the mold opening sequence is as follows:

[0072] First, the sound absorbing material 12 and the metal insert 13 are placed in the mold and the mold is closed to ensure that the metal insert 13 is correctly placed on the core rod 28. The fixed mold oil cylinder 25 drives the slide 26 to move sideways, driving the fixed mold slider 27 to move obliquely upward, and the movement direction is parallel to the axial direction of the curved pipe part of the noise reduction pipe 10. The fixed mold slider 27 switches from the state of colliding with the mold core 39 to a position away from the mold core 39 until it is completely separated from the noise reduction pipe 10, and the core rod 28 is also separated from the metal insert 13.

[0073] Subsequently, the front mold assembly 20 and the rear mold assembly 30 are opened, and the A plate 21 and the B plate 31 move away from each other, making room for the lateral movement of the movable mold slider 34. Next, the fixing rod 35 is ejected upward by the spring 38, and the self-locking portion 35d is disengaged from the locking groove 34d. After that, the two movable mold cylinders 33 can simultaneously drive the movable mold slider 34 to move away from each other, ensuring that the movable mold slider 34 is separated from the noise reduction tube 10. In this process, the movable mold slider 34 drives the movable insert 36 to move obliquely, and the oblique slide 36c moves obliquely along the oblique slide groove 35a until the molding portion 36b of the movable insert 36 is separated from the boss 11b on the flange portion 11a.

[0074] Finally, the noise reduction tube 10 is removed to ensure that it is smoothly separated from the mold core 39. The waste material at the half gate 34a is attached to the injection molded part 11 of the noise reduction tube 10 and can be cut off after molding. This sequence ensures efficient mold opening and complete molding of the injection molded part 11, while avoiding molding defects caused by improper operation.

[0075] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0076] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0077] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0078] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0079] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0080] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An engine air intake noise reduction pipe mold, characterized in that: include: The front mold assembly includes an A plate, a slide seat, a fixed mold slider and a core rod, wherein the slide seat is slidably mounted on the A plate, the fixed mold slider is slidably mounted on the inclined surface of the slide seat, so that the fixed mold slider follows the lateral movement of the slide seat to perform an oblique core pulling movement, and the core rod is fixedly mounted on the fixed mold slider, and the core rod is adapted to the inner hole of the metal insert; A rear mold assembly, comprising a B plate, a pair of movable mold sliders, a pair of movable inserts, a pair of fixed rods and a mold core, wherein the mold core is fixedly installed at the center of the B plate, the pair of movable mold sliders, the movable inserts and the fixed rods are symmetrically arranged on both sides of the mold core, the fixed rods are located outside the movable mold sliders and are fixed relative to the lateral position of the B plate, the movable inserts are obliquely matched with the movable mold sliders, the inner ends of the movable inserts are the molding ends embedded in the movable mold sliders, and the outer ends are slidably connected to the fixed rods through the oblique through holes on the B plate, and the movable inserts have molding portions for molding bosses; When the mold is closed, the movable mold slider and the mold core are combined to form a fixed space for fixing the sound absorbing material, the core rod and the movable mold slider collide with each other to form a fixed space for fixing the metal insert, the fixed mold slider collide with each other, and the movable mold slider, the mold core, the movable insert and the fixed mold slider are combined to form a cavity for forming the noise reduction pipe; When the mold is opened, the fixed mold slider performs an oblique core pulling action until the fixed mold slider is separated from the noise reduction tube, the core rod is separated from the metal insert, the movable mold slider performs a lateral core pulling action, and the movable mold slider drives the movable insert to perform an oblique core pulling action until it is separated from the boss.

2. The engine air intake noise reduction pipe mold according to claim 1, characterized in that: The front mold assembly also includes a positioning ring and a nozzle. A pair of moving mold sliders are provided with half gates on the opposite sides. When the mold is closed, the combination of the two half gates is connected to the nozzle.

3. The engine air intake noise reduction pipe mold according to claim 1, characterized in that: The fixing rod is provided with an inclined sliding groove, the outer end of the movable insert is provided with an inclined sliding block, and the inclined sliding block is slidably matched with the inclined sliding groove.

4. The engine air intake noise reduction pipe mold according to claim 3, characterized in that: A fixing block is elastically mounted on the bottom plate of the rear mold assembly, and the lower end of the fixing rod is fixedly mounted between the fixing block and the movable mold slider.

5. The engine air intake noise reduction pipe mold according to claim 4, characterized in that: An inclined mounting groove is provided at the bottom of the movable mold slider, and the fixed block has an inclined surface abutting against the inclined mounting groove. When the movable mold slider performs a lateral core pulling action, the inclined mounting groove pushes the fixed block downward.

6. The engine air intake noise reduction pipe mold according to claim 5, characterized in that: A slot is provided at the bottom end of the fixing rod, and the slot is matched with the fixing block. When the fixing block moves downward, the fixing block is always located in the slot to limit the lateral movement of the fixing rod.

7. The engine air intake noise reduction pipe mold according to claim 4, characterized in that: A spring is arranged between the fixed block and the bottom plate, and the spring has an elastic tendency to keep the fixed block in close contact with the movable mold slider.

8. The engine air intake noise reduction pipe mold according to claim 1, characterized in that: A protrusion is provided at the bottom end of the fixing rod, and a avoidance structure is provided on the movable mold sliding block corresponding to the position of the protrusion.

9. The engine air intake noise reduction pipe mold according to claim 1, characterized in that: The fixing rod is fixed in a lateral position and is installed on the B plate in a floating manner along the mold opening direction. The fixing rod is provided with a self-locking portion, and a locking groove is provided on the surface of the movable mold slider. When the mold is closed, the A plate pushes the fixing rod downward to allow the self-locking portion to be stuck in the locking groove. When the mold is opened, the self-locking portion is disengaged from the locking groove.

10. The engine air intake noise reduction pipe mold according to claim 9, characterized in that: A spring is arranged between the fixing rod and the bottom plate of the rear mold assembly, and the spring has an elastic tendency to make the self-locking part escape from the locking groove.

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