Car lamp shell injection mold and machining process thereof

Abstract

The invention belongs to the technical field of injection molds, and particularly relates to a car lamp shell injection mold and a machining process thereof.The car lamp shell injection mold comprises a first mold plate provided with a mold cavity and a second mold plate provided with a mold core, a forming mechanism and a driving mechanism are installed in the second mold plate, and a negative pressure mechanism is installed in the first mold plate; the forming mechanism comprises a threaded rod located on the side face of the mold core and used for forming internal threads, a compensation assembly used for compensating displacement of the threaded rod in the axial direction of the compensation assembly and a centering assembly used for correcting the threaded rod. The driving mechanism is used for driving the threaded rod to rotate and driving the centering assembly to correct the threaded rod; the negative pressure mechanism is used for generating negative pressure between the lamp shell and the cavity; by means of the compensation assembly, when the threaded rod is rotationally driven through the driving mechanism and mold opening is synchronously carried out, compensation adjustment can be carried out on axial displacement caused by rotation of the threaded rod and axial displacement caused by mold opening, axial tension can be avoided, the production efficiency is effectively improved, and damage to internal threads is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of injection molds, and particularly relates to an injection mold for a vehicle lamp housing and its processing technology. Background Art

[0002] The lamp cover of an electric vehicle headlamp, also known as a lamp housing, is usually processed by an injection mold. The lamp housing is usually fixed on the electric vehicle by bolts. Therefore, threaded holes are usually opened on the lamp housing to facilitate the subsequent assembly of fixing the lamp housing with bolts.

[0003] When a traditional injection mold with internal thread processing injects and forms a product, usually after forming, the threaded rod for internal thread processing is first withdrawn, and then the mold is opened. For example, an injection mold with internal thread and its demolding method disclosed in Chinese Patent Application No. (2017105230747) first starts the rotation driving mechanism to drive the rotation of the shaft rod to withdraw the thread core from the injection part to achieve an automatic core-pulling action, and then separates the first mold and the second mold in opposite directions. This method is not conducive to improving production efficiency. And when the withdrawal of the threaded rod and the mold opening are synchronized, due to the difference in the axial movement rate of the threaded rod during rotation and the mold opening movement rate, even if calculations and settings are made in advance, small axial deviations will generate axial tension, thereby damaging the internal thread hole. Summary of the Invention

[0004] The purpose of the present invention is to provide an injection mold for a vehicle lamp housing and its processing technology for the above-mentioned existing technical problems, achieving the effect of being able to perform the operations of withdrawing the threaded rod for internal thread processing and mold opening synchronously, and being able to avoid generating axial tension and damaging the internal thread.

[0005] In view of this, the present invention provides an injection mold for a vehicle lamp housing, including: A first template, provided with a cavity; A second template, provided with a core matching the cavity; A forming mechanism, installed in the second template, and including a threaded rod located on the side of the core and used for internal thread forming, a compensation component for compensating the axial displacement of the threaded rod, and a centering component for correcting the threaded rod; A driving mechanism, installed in the second template, and used for driving the rotation of the threaded rod and driving the centering component to correct the threaded rod; A negative pressure mechanism, installed in the first template, and used for generating negative pressure between the lamp housing and the cavity.

[0006] In the above technical solution, further, the compensation component includes; A bearing, and a stepped hole for bearing sliding is opened in the second template; Fixed ring, installed in the stepped hole; First spring, installed in the stepped hole, and both ends are respectively abutted against the outer diameter of the bearing and the fixed ring; Limit strip, installed on the inner wall of the stepped hole, and used to limit the bearing to move only axially, and a limit groove adapted to the limit strip is provided on the outer diameter surface of the bearing.

[0007] In the above technical solution, further, the centering assembly includes: Centering part, an installation groove for installing the centering part is provided in the second template; Pushing part, one end is hinged to the centering part, the other end is connected to the driving mechanism, and is driven by the driving mechanism to approach or move away from the centering part; Elastic pad, installed on the side of the pushing part close to the centering part.

[0008] In the above technical solution, further, the driving mechanism includes: First ratchet assembly, installed in the second template, and used to drive the pushing part to approach the centering part unidirectionally; Spring assembly, installed in the centering part, and used to drive the pushing part away from the centering part; Second ratchet assembly, installed in the second template, and used to drive the threaded rod to rotate unidirectionally; Driving motor, installed on the side of the second template, and used to drive the first ratchet assembly and the second ratchet assembly; Wherein, the unidirectional driving directions of the first ratchet assembly and the second ratchet assembly are opposite.

[0009] In the above technical solution, further, the first ratchet assembly includes: First input shaft, connected to the output shaft of the driving motor, and a first pawl is provided at the end far from the driving motor; First output shaft, installed in the second template, and provided with a first ratchet adapted to the first pawl, and a first ratchet tooth engaged with the first pawl is provided on the first ratchet; First driving gear, installed on the first output shaft; Pull rod, both ends are respectively movably connected to the pushing part, and a tooth sleeve engaged with the first driving gear is sleeved.

[0010] In the above technical solution, further, the spring assembly includes: Second spring, an installation hole for installing the second spring is provided on the centering part, and both ends of the second spring are respectively abutted against the pushing part and the inner wall of the installation hole; Wherein, the pull rod passes through the installation hole and is connected with an adjusting nut for limiting the position of the pushing part on the pull rod, and a strip hole for the pull rod to pass through is provided on the pushing part.

[0011] In the above technical solution, further, the second ratchet assembly includes: A second driving gear mounted on the output shaft of the driving motor; A second input shaft, with a third driving gear meshing with the second driving gear at one end and a second pawl at the other end; A second output shaft, mounted in the second template, and provided with a second ratchet adapted to the second pawl, and a second ratchet tooth engaged with the second pawl is provided on the second ratchet; Wherein, one end of the threaded rod located in the second template is provided with a limiting protrusion, one end of the second output shaft away from the second input shaft is provided with a limiting groove, and the radial cross-sections of the limiting protrusion and the limiting groove are non-circular, and the limiting protrusion can move axially along the limiting groove.

[0012] In the above technical solution, further, the negative pressure mechanism includes: A piston, and a piston hole for the piston to slide is formed in the first template; A piston rod, connected to the side of the piston, and a connecting plate is provided at the other end extending out of the piston hole; A driving cylinder, mounted on the side of the first template, and the output end extends into the first template and is connected to the connecting plate; Wherein, the surface of the piston away from the piston rod is flush with the inner wall of the cavity.

[0013] In the above technical solution, further: The first template is provided with a vent hole, and the vent hole is used to communicate the piston hole with the surface of the first template and is used to relieve the negative pressure when conducting.

[0014] The present invention provides a processing technology for an injection mold of a car headlight lamp housing, including the following steps: S1: The driving mechanism drives the centering assembly to correct the threaded rod; S2: The first template and the second template are closed, and materials are injected into the cavity, and cooling is carried out after the lamp housing is formed; S3: The negative pressure mechanism generates negative pressure between the cooled lamp housing and the cavity; S4: The driving mechanism reversely drives the threaded rod to rotate, and the first template and the second template are simultaneously opened; S5: After the mold opening is completed, the threaded rod completely withdraws from the internal thread, the driving mechanism is closed, and the negative pressure mechanism relieves the negative pressure state between the lamp housing and the cavity, and the lamp housing is taken off.

[0015] The beneficial effects of the present invention are: 1. By providing a compensation component that enables axial displacement compensation of the threaded rod, during the rotational drive of the threaded rod by the drive mechanism, mold opening can be synchronized. Moreover, when the axial displacement caused by the rotation of the threaded rod and the axial displacement of the threaded rod due to mold opening are self-adjusted by the compensation component, it can effectively prevent the threaded rod from generating axial tension on the internal thread. Therefore, the production efficiency can be effectively improved, and damage to the internal thread can be avoided.

[0016] 2. Before the injection molding of the threaded rod by the centering component, its structural stability and position accuracy can be ensured, effectively improving the machining accuracy and molding stability of the internal thread, and preventing the internal thread from deforming due to the instability of the threaded rod during molding, thus effectively improving the product quality.

[0017] 3. Through the negative pressure mechanism, the connection strength between the first template and the lamp housing during mold opening can be improved, the structural stability of the lamp housing can be enhanced, the stability of the threaded rod exiting from the internal thread can be ensured, and the product quality can be guaranteed.

[0018] 4. Through the setting of the first ratchet component and the second ratchet component, the driving motor is used unidirectionally for the correction of the threaded rod and reversely for driving the rotation of the threaded rod. And when it rotates in the reverse direction, the spring component gradually pushes the pushing part away from the centering part, gradually reducing the resistance to the rotation of the threaded rod, making the drive show a deceleration effect in the early stage, ensuring that the internal thread is not torn when the threaded rod separates from the internal thread at the initial stage, and guaranteeing the product quality. Description of the Drawings

[0019] Figure 1 is the structural schematic diagram of the present invention; Figure 2 is the partial cross-sectional view of the present invention; Figure 3 is the present invention Figure 2 the enlarged view at A in; Figure 4 is the top view of the present invention; Figure 5 is the present invention Figure 4 the cross-sectional view at B - B in; Figure 6 is the present invention Figure 5 the enlarged view at C in; Figure 7 is the structural schematic diagram of the drive mechanism of the present invention; Figure 8 is the partial exploded view of the first perspective of the threaded rod of the present invention; Figure 9 is the partial exploded view of the second perspective of the threaded rod of the present invention; Figure 10 is the exploded view of the centering component of the present invention; The markings in the figure are as follows: 1. First template; 10. Vent hole; 2. Cavity; 3. Second template; 4. Core; 5. Threaded rod; 50. Limit projection; 6. Compensation component; 60. Bearing; 61. Step hole; 62. Fixed ring; 63. First spring; 64. Limit strip; 65. Limit groove; 7. Centering component; 70. Centering part; 71. Pushing part; 72. Elastic pad; 73. Mounting hole; 74. Strip hole; 8. Driving mechanism; 80. First ratchet component; 800. First input shaft; 801. First ratchet pawl; 802. First output shaft; 803. First ratchet; 804. First ratchet tooth; 805. First driving gear; 806. Pull rod; 807. Gear sleeve; 81. Spring component; 810. Second spring; 811. Adjusting nut; 82. Second ratchet component; 820. Second driving gear; 821. Second input shaft; 822. Third driving gear; 823. Second ratchet pawl; 824. Second output shaft; 825. Second ratchet; 826. Second ratchet tooth; 827. Limit groove; 83. Driving motor; 9. Negative pressure mechanism; 90. Piston; 91. Piston hole; 92. Piston rod; 93. Connecting plate; 94. Driving cylinder. Detailed implementation mode

[0020] The following will clearly describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope protected by the present application.

[0021] Embodiment 1: This embodiment provides an injection mold for a car headlight lamp housing, including: The first template 1 is provided with a cavity 2; The second template 3 is provided with a core 4 that cooperates with the cavity 2; A forming mechanism is installed in the second template 3 and includes a threaded rod 5 located on the side of the core 4 and used for internal thread forming, a compensation component 6 for axial displacement compensation of the threaded rod 5, and a centering component 7 for correcting the threaded rod 5; A driving mechanism 8 is installed in the second template 3 and is used to drive the threaded rod 5 to rotate and drive the centering component 7 to correct the threaded rod 5; A negative pressure mechanism 9 is installed in the first template 1 and is used to generate negative pressure between the lamp housing and the cavity 2; Among them, the first template 1 can be a fixed template, the second template 3 can be a moving template, and the mechanism for driving the second template 3 to move is a mature existing technology and is known to those skilled in the art from traditional injection molding equipment, so it will not be elaborated here; Meanwhile, for the installation of the compensation assembly 6, the centering assembly 7, the driving mechanism 8, and the negative pressure mechanism 9, both the first template 1 and the second template 3 can be arranged in multiple layers, which is a conventional operation and will not be elaborated here; Moreover, only a section of the threaded rod 5 that extends out of the second template 3 and is located on the side of the core 4 is provided with an external thread for internal thread forming.

[0022] As can be seen from this embodiment, by providing the compensation assembly 6 for the threaded rod 5 to be able to perform displacement compensation along its axial direction, when the threaded rod 5 is rotationally driven by the driving mechanism 8, the mold can be opened synchronously, and the axial displacement generated by the rotation of the threaded rod 5 and the axial displacement of the threaded rod 5 caused by mold opening are self-adjusted by the compensation assembly 6, which can effectively avoid the axial tension of the threaded rod 5 on the internal thread. Therefore, the production efficiency is effectively improved, and the damage to the internal thread is avoided; The centering assembly 7 can ensure the structural stability and position accuracy of the threaded rod 5 before injection molding, effectively improve the processing accuracy and molding stability of the internal thread, and avoid the deformation of the internal thread due to the instability of the threaded rod 5 during molding, effectively improving the product quality; And the negative pressure mechanism 9 can improve the connection strength between the first template 1 and the lamp housing during mold opening, improve the structural stability of the lamp housing, ensure the stability of the threaded rod 5 exiting from the internal thread, and ensure the product quality.

[0023] Embodiment 2: This embodiment provides an injection mold for a vehicle lamp housing. In addition to including the technical solutions of the above embodiment, it also has the following technical features. The compensation assembly 6 includes; A bearing 60, and a stepped hole 61 for the bearing 60 to slide is opened in the second template 3; A fixing ring 62, which is installed in the stepped hole 61 and has an interference fit with the inner wall of the stepped hole 61; A first spring 63, which is installed in the stepped hole 61 and has its two ends respectively abutted against the outer diameter of the bearing 60 and the fixing ring 62; A limiting strip 64, which is installed on the inner wall of the stepped hole 61 and is used to limit the bearing 60 to move only along the axial direction, and a limiting groove 65 adapted to the limiting strip 64 is opened on the outer diameter surface of the bearing 60; Wherein, two compensation assemblies 6 are arranged along the axial direction of the threaded rod 5, the centering assembly 7 is located between the two compensation assemblies 6, and the mold opening moving speed of the first template 1 and the second template 3 is less than the moving speed of the driving mechanism 8 driving the threaded rod 5 to rotate and generate axial displacement.

[0024] It can be seen from this embodiment that by adopting the arrangement of the first spring 63 and the fixing ring 62, the bearing 60 can be easily compensated for displacement in the axial direction. When there is a deviation between the displacement of the threaded rod 5 caused by rotation and the displacement caused by mold opening, the first spring 63 is compressed and restored to compensate, thereby effectively preventing the threaded rod 5 from generating axial tension and causing damage to the internal thread. By setting the mold opening movement speed of the first mold plate 1 and the second mold plate 3 to be less than the movement speed of the driving mechanism 8 driving the threaded rod 5 to rotate and generate axial displacement, the first spring 63 can push the bearing 60 and the bolt rod to abut against the axial inner wall of the stepped hole 61 when the threaded rod 5 is in the initial state, thereby further improving the stability of the threaded rod 5 during the injection molding of the lamp housing; Furthermore, the limiting strip 64 can ensure that the bearing 60 only moves in the axial direction, further improving the stability and ensuring that the screw rod withdraws from the internal thread, while the bearing 60 can better limit the radial direction of the threaded rod 5 without restricting the rotation of the threaded rod 5.

[0025] Embodiment 3: This embodiment provides an injection mold for a lamp housing of a vehicle lamp. In addition to the technical solutions of the above embodiments, it also has the following technical features. The centering component 7 includes: The centering part 70, a mounting groove for mounting the centering part 70 is provided in the second template 3, and the centering part 70 and the mounting groove are fastened with bolts; The pushing portion 71 has one end hingedly connected to the centering portion 70 and the other end connected to the driving mechanism 8, and is driven by the driving mechanism 8 to move closer to or away from the centering portion 70; The elastic pad 72 is installed on one side of the pushing portion 71 close to the centering portion 70; The centering portion 70 and the pushing portion 71 are both provided with arc grooves adapted to the threaded rod 5 , and the elastic pad 72 is made of rubber.

[0026] It can be seen from the present embodiment that the accuracy of the axial position of the threaded rod 5 is ensured by adopting a fixed centering portion 70, and the pushing portion 71 can correct the threaded rod 5 to avoid deviation in the radial position of the threaded rod 5, thereby effectively ensuring product quality, and the elastic pad 72 can improve the adaptation effect between the pushing portion 71 and the threaded rod 5, and combined with the arc groove, can avoid radial displacement of the threaded rod 5.

[0027] Embodiment 4: This embodiment provides an injection mold for a lamp housing of a vehicle lamp. In addition to the technical solutions of the above embodiments, it also has the following technical features. The driving mechanism 8 includes: A first ratchet assembly 80 is installed in the second template 3 and is used to unidirectionally drive the push portion 71 to approach the centering portion 70; The spring assembly 81 is installed inside the centering part 70 and is used to drive the pushing part 71 away from the centering part 70; The second ratchet assembly 82 is installed inside the second template 3 and is used to drive the threaded rod 5 to rotate unidirectionally; The driving motor 83 is installed on the side of the second template 3 and is used to drive the first ratchet assembly 80 and the second ratchet assembly 82; Wherein, the unidirectional driving directions of the first ratchet assembly 80 and the second ratchet assembly 82 are opposite.

[0028] It can be seen from this embodiment that through the settings of the first ratchet assembly 80 and the second ratchet assembly 82, the driving motor 83 is used unidirectionally for the correction of the threaded rod 5 and reversely for driving the rotation of the threaded rod 5. And when reversing, the spring assembly 81 gradually pushes the pushing part 71 away from the centering part 70, gradually reducing the resistance to the rotation of the threaded rod 5, making the driving show a decelerating effect in the early stage, ensuring that the internal thread is not torn when the threaded rod 5 is separated from the internal thread at the initial stage, and ensuring the product quality; Specifically, at the initial stage when the driving motor 83 reversely drives the second ratchet assembly 82 and drives the threaded rod 5 to rotate, at this time the first ratchet assembly 80 has not released the restriction on the pushing part 71. Therefore, at the initial stage of driving the threaded rod 5 to rotate, there is a certain frictional resistance on the surface of the threaded rod 5, so it will have a decelerating effect on the rotation of the threaded rod 5. At the same time, the elastic pad 72 can deform, and thus provide a certain compensation for the rotation of the threaded rod 5; Then, as the second ratchet assembly 82 rotates, the first ratchet assembly 80 gradually releases the restriction on the pushing part 71, and the spring assembly 81 gradually pushes the pushing part 71 away from the centering part 70. When the elastic pad 72 completely leaves the surface of the threaded rod 5 and loses the frictional resistance, that is, it has an accelerating effect compared with the initial stage of rotation, which can avoid the situation that the internal thread is torn due to the too fast rotation of the threaded rod 5 at the initial stage of rotation, effectively ensuring the product quality; At the same time, in order to avoid the frictional resistance of the elastic pad 72 on the threaded rod 5 being too large and affecting the input of the driving motor 83, lubricating oil can be applied to the surface of the elastic pad 72 and the threaded rod 5 or a lubricating layer can be provided.

[0029] Embodiment 5: This embodiment provides a plastic injection mold for a car headlight lamp housing. In addition to including the technical solutions of the above embodiment, it also has the following technical features. The first ratchet assembly 80 includes: The first input shaft 800 is connected to the output shaft of the driving motor 83, and a first ratchet pawl 801 is provided at one end away from the driving motor 83; The first output shaft 802 is installed inside the second template 3, and is provided with a first ratchet wheel 803 adapted to the first ratchet pawl 801, and a first ratchet tooth 804 engaged with the first ratchet pawl 801 is provided on the first ratchet wheel 803; The first driving gear 805 is mounted on the first output shaft 802; The pull rod 806 is movably connected to the pushing part 71 at both ends, and a gear sleeve 807 meshing with the first driving gear 805 is sleeved thereon; Wherein, the gear sleeve 807 can be a rack, and the pull rod 806 and the gear sleeve 807 are locked by bolts; Meanwhile, both the first input shaft 800 and the first output shaft 802 are connected to the second template 3 by bearings 60.

[0030] It can be seen from this embodiment that the ratchet connection between the first pawl 801 and the first ratchet teeth 804 between the first input shaft 800 and the first output shaft 802 can ensure the one-way pushing of the pushing part 71. After the pushing part 71 moves in place under the action of the spring assembly 81, the first output shaft 802 will not continue to rotate when driven in the reverse direction by the second ratchet assembly 82, ensuring the control of the pushing part 71; And the use of bearings 60 for connection can ensure low frictional resistance during rotation, and at the same time can improve the stability of the installation structure.

[0031] Embodiment 6: This embodiment provides an injection mold for a car headlight lamp housing. In addition to including the technical solutions of the above embodiments, it also has the following technical features. The spring assembly 81 includes: The second spring 810. An installation hole 73 for installing the second spring 810 is opened on the opposing middle part 70, and both ends of the second spring 810 are respectively in contact with the pushing part 71 and the inner wall of the installation hole 73; Wherein, the pull rod 806 passes through the installation hole 73 and is connected with an adjusting nut 811 for restricting the position of the pushing part 71 on the pull rod 806, and a strip-shaped hole 74 for the pull rod 806 to pass through is opened on the pushing part 71; Meanwhile, due to the adjusting nut 811 provided on the pull rod 806, an external thread is provided on the surface of the pull rod 806 at the position of the adjusting nut 811.

[0032] It can be seen from this embodiment that by opening the installation hole 73 for installing the second spring 810 on the opposing middle part 70, the installation stability of the second spring 810 can be improved, and the contact at both ends with the pushing part 71 and the inner wall of the installation hole 73 will not slip off; The adjusting nut 811 can adjust its position on the pull rod 806, so as to facilitate adjusting the maximum and minimum distances between the pushing part 71 and the opposing middle part 70; And the strip-shaped hole 74 facilitates compensation when the pushing part 71 rotates around its hinge connection with the opposing middle part 70, so that when the pushing part 71 rotates, it will not be blocked by the pull rod 806.

[0033] Example 7: This embodiment provides an injection mold for a headlight lamp housing. In addition to the technical solutions of the above embodiments, it also has the following technical features. The second ratchet assembly 82 includes: A second driving gear 820, which is installed on the output shaft of the driving motor 83; A second input shaft 821, with a third driving gear 822 provided at one end meshing with the second driving gear 820, and a second pawl 823 provided at the other end; A second output shaft 824, which is installed in the second template 3 and is provided with a second ratchet 825 adapted to the second pawl 823, and a second ratchet tooth 826 engaged with the second pawl 823 is provided on the second ratchet 825; Wherein, one end of the threaded rod 5 located in the second template 3 is provided with a limit protrusion 50, one end of the second output shaft 824 away from the second input shaft 821 is provided with a limit groove 827, and the radial cross-sections of the limit protrusion 50 and the limit groove 827 are non-circular, and the limit protrusion 50 can axially move along the limit groove 827.

[0034] It can be seen from this embodiment that through the setting of the second driving gear 820, it is convenient for the driving motor 83 to drive the second input shaft 821, and the engagement connection between the second pawl 823 and the second ratchet tooth 826 between the second input shaft 821 and the second output shaft 824 can facilitate ensuring one-way driving, avoiding the second output shaft 824 from rotating when the first ratchet assembly 80 drives unidirectionally. That is to say, when calibrating the threaded rod 5, the threaded rod 5 will not rotate, improving the stability of calibration; And the setting of the limit protrusion 50 and the limit groove 827 between the threaded rod 5 and the second output shaft 824 enables only axial relative movement between the threaded rod 5 and the second output shaft 824, and radial relative rotation cannot be performed. And the radial cross-sections of the limit protrusion 50 and the limit groove 827 are non-circular. That is to say, it is convenient to ensure the driving of the second output shaft 824 for the radial rotation of the threaded rod 5.

[0035] Example 8: This embodiment provides an injection mold for a headlight lamp housing. In addition to the technical solutions of the above embodiments, it also has the following technical features. The negative pressure mechanism 9 includes: A piston 90, and a piston hole 91 for the piston 90 to slide is opened in the first template 1; A piston rod 92, which is connected to the side of the piston 90, and the other end extends out of the piston hole 91 and is provided with a connecting plate 93; A driving cylinder 94, which is installed on the side of the first template 1, and the output end extends into the first template 1 and is connected to the connecting plate 93; Wherein, the side of the piston 90 away from the piston rod 92 is flush with the inner wall of the cavity 2; Meanwhile, a plurality of piston holes 91 can be formed in the first template 1, and they are not regularly arranged. According to the surface shape of the lamp housing, the piston holes 91 can be formed at the positions of the cavity 2 corresponding to the relatively flat surfaces of the lamp housing.

[0036] It can be seen from this embodiment that after the lamp housing is injection-molded, its surface usually adheres tightly to the inner wall of the cavity 2. Therefore, by driving the air cylinder 94 to pull the piston 90, a negative pressure state is formed in the piston hole 91 between the piston 90 and the lamp housing, thereby improving the connection strength between the lamp housing and the cavity 2, and facilitating the withdrawal of the threaded rod 5 from the internal thread while opening the mold; And making the side of the piston 90 away from the piston rod 92 flush with the inner wall of the cavity 2 can effectively ensure the forming effect of the lamp housing surface; Since a plurality of piston holes 91 can be formed in the first template 1 and they are not regularly arranged, and according to the surface shape of the lamp housing, the piston holes 91 can be formed at the positions of the cavity 2 corresponding to the relatively flat surfaces of the lamp housing. On the one hand, it can reduce the possibility of air leakage in the piston holes 91 in the negative pressure state, and on the other hand, it can improve the adsorption strength between the lamp housing and the cavity 2, improve the stability of the lamp housing during mold opening, and the setting of the connecting plate 93 can ensure the installation and driving of multiple pistons 90.

[0037] Embodiment 9: This embodiment provides an injection mold for a vehicle lamp housing. In addition to including the technical solutions of the above embodiments, it also has the following technical features: An air vent hole 10 is formed in the first template 1, and the air vent hole 10 is used to communicate the piston hole 91 with the surface of the first template 1 and is used to relieve the negative pressure during conduction; Wherein, the air vent hole 10 can be formed on the lower end surface of the first template 1.

[0038] It can be seen from this embodiment that after pulling the piston 90 through the air vent hole 10, the piston hole 91 originally in the negative pressure state is communicated with the external space of the mold to relieve the negative pressure state, and the structure is simple; And forming the air vent hole 10 on the lower end surface of the first template 1 can further reduce the entry of dust into the air vent hole 10, reduce the possibility of blockage, and extend the service life; Meanwhile, the negative pressure mechanism 9 has three control periods. When the surface of the piston 90 is flush with the inner wall of the cavity 2, it is the injection molding period. When the piston 90 is pulled and located on the side of the vent hole 10 close to the cavity 2, it is the negative pressure generation period. When the piston 90 is continuously pulled and located on the side of the vent away from the cavity 2, it is the negative pressure release period. And a pause is required during the negative pressure generation period. That is to say, the driving of the driving cylinder 94 can adopt three states: not started, maintained in the middle, and fully started. This kind of control for the driving cylinder 94 is a mature existing technology and will not be elaborated here.

[0039] Embodiment 10: This embodiment provides a processing technology for an injection mold of a vehicle lamp housing, including the following steps: S1: The driving mechanism 8 drives the centering component 7 to correct the threaded rod 5; S2: The first template 1 and the second template 3 are closed, and materials are injected into the cavity 2, and after the lamp housing is formed, it is cooled; S3: The negative pressure mechanism 9 generates negative pressure between the cooled lamp housing and the cavity 2; S4: The driving mechanism 8 reversely drives the threaded rod 5 to rotate, and simultaneously opens the first template 1 and the second template 3; S5: After the mold opening is completed, the threaded rod 5 completely withdraws from the internal thread, the driving mechanism 8 is closed, and the negative pressure mechanism 9 releases the negative pressure state between the lamp housing and the cavity 2, and the lamp housing is taken off.

[0040] It can be seen from this embodiment that through the above process, an internal thread can be directly produced during the injection molding of the lamp housing, and while the threaded rod 5 used for producing the internal thread is withdrawn, the mold opening operation can be carried out, effectively ensuring the production efficiency, avoiding the need to wait for the threaded rod 5 to completely withdraw before carrying out the mold opening, and the negative pressure mechanism 9 can ensure the connection strength between the lamp housing and the first template 1, thereby improving the stability when the lamp housing is mold opened and the threaded rod 5 is withdrawn, and avoiding affecting the withdrawal of the threaded rod 5.

[0041] The embodiments of the present application have been described above in conjunction with the accompanying drawings. Without conflict, the embodiments and the features in the embodiments in the present application can be combined with each other. The present application is not limited to the above specific implementation manners. The above specific implementation manners are only illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all belong to the protection scope of the present application.

Claims

1. A car lamp housing injection mold, characterized in that ,include: A first template (1) having a mold cavity (2); The second mold plate (3) is provided with a core (4) that cooperates with the mold cavity (2); A forming mechanism is installed in the second mold plate (3) and comprises a threaded rod (5) located on the side of the core (4) and used for forming the internal thread, a compensation component (6) used for compensating the axial displacement of the threaded rod (5), and a centering component (7) used for correcting the threaded rod (5); A driving mechanism (8) is installed in the second template (3) and is used to drive the threaded rod (5) to rotate and drive the centering assembly (7) to calibrate the threaded rod (5); The negative pressure mechanism (9) is installed in the first mold plate (1) and is used to generate negative pressure between the lamp housing and the mold cavity (2).

2. The vehicle lamp housing injection mold according to claim 1, characterized in that: The compensation component (6) comprises: A bearing (60), wherein the second template (3) is provided with a stepped hole (61) for the bearing (60) to slide; A fixing ring (62) is installed in the stepped hole (61); A first spring (63) is installed in the stepped hole (61), and two ends thereof are respectively in contact with the outer diameter of the bearing (60) and the fixing ring (62); The limiting strip (64) is installed on the inner wall of the stepped hole (61) and is used to limit the bearing (60) to move only in the axial direction, and the outer diameter surface of the bearing (60) is provided with a limiting groove (65) adapted to the limiting strip (64).

3. The vehicle lamp housing injection mold according to claim 1, characterized in that: The centering assembly (7) comprises: A centering portion (70), wherein a mounting groove (30) for mounting the centering portion (70) is provided in the second template (3); A pushing portion (71), one end of which is hingedly connected to the centering portion (70), and the other end of which is connected to the driving mechanism (8), and is driven by the driving mechanism (8) to move closer to or away from the centering portion (70); The elastic pad (72) is mounted on a side of the pushing portion (71) close to the centering portion (70).

4. The vehicle lamp housing injection mold according to claim 3, characterized in that: The driving mechanism (8) comprises: A first ratchet assembly (80) is installed in the second template (3) and is used to unidirectionally drive the pushing portion (71) to approach the centering portion (70); A spring assembly (81) is installed in the centering portion (70) and is used to drive the pushing portion (71) away from the centering portion (70); A second ratchet assembly (82) is installed in the second template (3) and is used to drive the threaded rod (5) to rotate in one direction; A driving motor (83) mounted on a side of the second template (3) and used to drive the first ratchet assembly (80) and the second ratchet assembly (82); Wherein, the one-way driving directions of the first ratchet assembly (80) and the second ratchet assembly (82) are opposite.

5. The vehicle lamp housing injection mold according to claim 4, characterized in that: The first ratchet assembly (80) comprises: A first input shaft (800) is connected to the output shaft of the drive motor (83), and a first ratchet (801) is provided at one end away from the drive motor (83); The first output shaft (802) is installed in the second template (3) and is provided with a first ratchet wheel (803) adapted to the first ratchet pawl (801), and the first ratchet wheel (803) is provided with a first ratchet tooth (804) ratchet-engaged with the first ratchet pawl (801); A first driving gear (805) is mounted on the first output shaft (802); The pull rod (806) has two ends movably connected to the push portion (71) and is sleeved with a gear sleeve (807) that meshes with the first drive gear (805).

6. The vehicle lamp housing injection mold according to claim 5, characterized in that: The spring assembly (81) comprises: A second spring (810), wherein a mounting hole (73) for mounting the second spring (810) is provided on the centering portion (70), and two ends of the second spring (810) are respectively in contact with the pushing portion (71) and the inner wall of the mounting hole (73); The pull rod (806) passes through the mounting hole (73) and is connected to an adjustment nut (811) for limiting the position of the pushing portion (71) on the pull rod (806), and the pushing portion (71) is provided with a strip hole (74) for the pull rod (806) to pass through.

7. The vehicle lamp housing injection mold according to claim 4, characterized in that: The second ratchet assembly (82) comprises: A second driving gear (820) mounted on an output shaft of the driving motor (83); A second input shaft (821) having a third driving gear (822) meshing with the second driving gear (820) at one end and a second ratchet pawl (823) at the other end; A second output shaft (824) is installed in the second template (3) and is provided with a second ratchet wheel (825) adapted to the second ratchet pawl (823), and the second ratchet wheel (825) is provided with a second ratchet tooth (826) ratchet-engaged with the second ratchet pawl (823); A limiting protrusion (50) is provided at one end of the threaded rod (5) located in the second template (3), a limiting groove (827) is provided at one end of the second output shaft (824) away from the second input shaft (821), and the radial cross-sections of the limiting protrusion (50) and the limiting groove (827) are non-circular, and the limiting protrusion (50) can move axially along the limiting groove (827).

8. The vehicle lamp housing injection mold according to claim 1, characterized in that: The negative pressure mechanism (9) comprises: A piston (90), wherein the first template (1) is provided with a piston hole (91) for the piston (90) to slide; A piston rod (92) is connected to a side of the piston (90), and the other end of the piston rod extends out of the piston hole (91) and is provided with a connecting plate (93); A driving cylinder (94) is mounted on a side of the first template (1), and an output end thereof extends into the first template (1) and is connected to the connecting plate (93); Wherein, a surface of the piston (90) away from the piston rod (92) is flush with the inner wall of the cavity (2).

9. The vehicle lamp housing injection mold according to claim 8, characterized in that: The first template (1) is provided with a vent hole (10), and the vent hole (10) is used to connect the piston hole (91) and the surface of the first template (1), and is used to release negative pressure when the vent hole (10) is connected.

10. A processing technology applied to the injection mold of the vehicle lamp housing according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: The driving mechanism (8) drives the centering assembly (7) to calibrate the threaded rod (5); S2: the first mold (1) and the second mold (3) are molded together, and material is injected into the mold cavity (2), and the lamp housing is cooled after being formed; S3: the negative pressure mechanism (9) generates negative pressure between the cooled lamp housing and the mold cavity (2); S4: the driving mechanism (8) drives the threaded rod (5) to rotate in the reverse direction, and opens the first mold plate (1) and the second mold plate (3) synchronously; S5: After the mold is opened, the threaded rod (5) is completely withdrawn from the internal thread, the driving mechanism (8) is closed, and the negative pressure mechanism (9) releases the negative pressure state between the lamp housing and the cavity (2), and the lamp housing is removed.

Images