Wheel speed sensor production process

Abstract

The invention discloses a wheel speed sensor production technology, and relates to the sensor production field, the wheel speed sensor production technology comprises a base station, the top end of the base station is provided with a lifting frame, the bottom of the lifting frame is provided with a liquid injection port, the top end of the base station on one side of the lifting frame is provided with a cooling box, the base station is internally provided with two driving shafts, and the outer surfaces of the two driving shafts are jointly connected with a conveyor belt. By adjusting the parameters of the injection molding process of the wheel sensor chip bracket and the wheel sensor sensing head, the wheel sensor chip bracket and the wheel sensor sensing head can be quickly molded, the molding period is short, the production efficiency is high, automation is easy to realize, large-batch products can be quickly manufactured, the labor cost is reduced, and the production efficiency is improved. By detecting the chip of the wheel speed sensor and the magnet corresponding to the chip, the wheel speed sensor can accurately measure the wheel speed of a vehicle when the wheel speed sensor is installed at the position, close to a hub, of the vehicle, the product precision is higher, meanwhile, an injection molding machine can conduct injection molding, cooling and demolding treatment on two molds at the same time, and the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of sensor production, and in particular to a wheel speed sensor production process. Background Art

[0002] The wheel speed sensor production process involves the manufacture and assembly of precision electronic components. For example, it is necessary to produce components that can use the magnetoresistance effect and the Hall effect to accurately measure changes in the magnetic field and thus detect wheel speed. This increases the requirements for the production environment and equipment to ensure the accuracy and reliability of the sensor.

[0003] In the existing wheel speed sensor production process, a relatively simple injection molding process is usually used for the injection molding production of the wheel speed sensor chip bracket and the sensor head, which has a certain impact on the hardness and toughness of the chip bracket and the sensor head. In addition, most existing injection molding machines can only perform injection molding, cooling and demolding on a single mold, which is a single-line operation and has low production efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a wheel speed sensor production process to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a wheel speed sensor production process, comprising the following steps: S1: Chip bracket injection molding, the chip bracket is injection molded by an injection molding machine, and the chip bracket is injection molded by an injection molding machine. There are three stages in the chip bracket injection molding, the temperature of the first stage is 285±15℃, the temperature of the second stage is 280±15℃, the temperature of the third stage is 275±15℃, the pressure of the first stage is 48±10bar, the speed is 45±10%, the injection stage time is 2.0±0.5S, the holding pressure is 20±5bar, the speed is 10±5%, and the time is 2±0.5S; the three storage stages are 45mm or 55mm, and the cooling time before storage is 11±2S; S2: Terminal punching, magnetic steel installation, chip, hot melting, spot welding CCD detection, continuous welding of multiple stations through the rotating table of the automatic turntable machine, welding current is 1.10±0.1KA; welding time is 30±5ms; S3: Injection molding of the sensor head. The sensor head is injected by an injection molding machine. When the sensor head of the front wheel speed sensor is injected, it is divided into three sections. The injection section is divided into three sections. The temperature of the first section is 285±15℃, the temperature of the second section is 280±15℃, and the temperature of the third section is 275±15℃; the pressure of the first section is 48±10bar, the speed is 45±10%, and the injection time is 2.0±0.5S; the holding pressure is 20±5bar, the speed is 10±5%, and the time is 2±0.5S; the three sections of material storage are 45mm or 55mm, and the cooling time before storage is 11±2S; when the sensor head of the rear wheel speed sensor is injected, it is divided into three sections. The temperature of the first section is 285±15℃, the second section is stable at 280±15℃, and the temperature of the third section is 275±15℃; the pressure of the first section is 48±10bar, and the speed is 45±10 %, time is 2.0±0.5S; holding pressure is 20±5bar, speed is 10±5%, time is 2±0.5S; three-stage storage is 45mm or 55mm, and the cooling time before storage is 10±2S; S4: Signal detection, the sensor built-in chip and its corresponding magnet are powered on and tested for pulse width through the performance test bench. The low level is 5.9-8.4mA; the high level is 11.8-16.8mA; the duty cycle is 40%~60%, the DR-L release pulse width is 76~104μs, the DR-R release pulse width is 153~207μs, and the stop pulse width is 1.232~1.656ms; S5: marking, using a laser marking machine to mark the housing of the front wheel speed sensor for easy identification; S6: Appearance, size inspection and sheath installation: Manually inspect the wheel speed sensor after production to ensure that there are no defects in appearance and the size is in compliance. After the inspection, a sheath is installed on the outside of the wheel sensor for protection; S7: Packing and warehousing: After the inspection, the wheel speed sensors that meet the standards are packaged and transported to the warehouse for storage.

[0006] Preferably, the injection molding machine includes a base, a lifting frame is provided at the top of the base, a liquid injection port is provided at the bottom of the lifting frame, a cooling box is provided at the top of the base on one side of the lifting frame, and the cooling box includes a cold air exhaust fan, which transports cold air to the inside of the cooling box to keep the inside of the cooling box in a low temperature state, and the lifting frame includes two electric push rods that can drive the liquid injection port to perform linear movement up and down, so as to align the opening of the mold and inject the melted plastic into the mold for injection molding, and when the mold is filled with raw materials, the mold is moved to the cooling point for cooling and solidification treatment inside.

[0007] Preferably, two driving shafts are provided inside the base, and the outer surfaces of the two driving shafts are commonly connected to a conveyor belt. A motor is provided at one end of any one of the driving shafts, and the motor drives the driving shaft to rotate. The two driving shafts are used in combination to make the conveyor belt run.

[0008] Preferably, the outer surface of the conveyor belt is provided with two articulated frames, one end of each of the two articulated frames is provided with a mold mounting frame, and two connecting rods are installed at both ends of the mold mounting frame. When the conveyor belt is running, the two mold mounting frames will be driven to perform linear motion with the conveyor belt as a trajectory, and injection molds can be installed on the top of the two mold mounting frames. When one of the molds is completed by injection molding, it can be conveyed to the inside of the cooling box through the conveyor belt, and the other mold is transported to the bottom of the injection port for injection. When the cooled mold is driven to move from the cooling box to the rear end of the top of the base for demolding, the mold that has been injected is transported to the inside of the cooling box for cooling, so that the injection molding machine can perform injection molding of multiple molds to improve efficiency.

[0009] Preferably, guide grooves are provided at opposite ends of the top of the base, and the guide grooves are used in conjunction with connecting rods on both sides of the mold mounting frame to limit the mold mounting frame, ensuring that the mold mounting frame can be driven by the conveyor belt and located above the base with the top facing upward and in a parallel state with the base.

[0010] Preferably, two partitions are provided at opposite ends of the base below the cooling box, and flexible curtains are provided at both ends of the cooling box. The flexible curtains and the partitions have a certain sealing effect, so that the inside of the cooling box maintains a low temperature.

[0011] Preferably, the outer surfaces of the two drive shafts are commonly connected to a synchronization component, which includes two pulleys and belts located on the outer surfaces of the two pulleys. The two pulleys are respectively installed on the outer surfaces of the corresponding drive shafts. When any one of the drive shafts is driven by the motor to rotate, the synchronization component drives the other drive shaft to rotate at the same speed through the pulley and the belt.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The wheel speed sensor production process adjusts the parameters of the wheel sensor chip bracket and the wheel sensor sensor head injection molding process, so that the wheel sensor chip bracket and the wheel sensor sensor head can be quickly molded, and the hardness and toughness of the wheel sensor chip bracket and the wheel sensor sensor head are improved.

[0013] This wheel speed sensor production process detects the chip of the wheel speed sensor and its corresponding magnet to ensure that the wheel speed sensor can accurately measure the vehicle's wheel speed when installed on the vehicle close to the wheel hub, making the product more accurate.

[0014] The wheel speed sensor production process is characterized in that two mold carriers are arranged inside the base of the injection molding machine. The two mold mounting frames are driven by the conveyor belt to move along a predetermined trajectory. When the parts are injected, one of the molds is driven by the mold mounting frame to inject while the other mold is in a state of waiting for injection. After the injection molding of the front-end mold is completed, it is driven by the conveyor belt into the cooling box for cooling and solidification treatment. At this time, the mold to be injected is transported to the bottom of the injection port for injection molding. After the cooled mold is cooled, it is transported out of the cooling box and is located on the top of the base for demoulding. The mold that has been injected enters the cooling box for cooling treatment, so that the injection molding machine can perform two mold injection, cooling and demoulding treatments at the same time, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the combined structure of the base platform and the cooling box of the present invention; Figure 2 It is a schematic diagram of the base structure of the present invention; Figure 3 It is a schematic diagram of the transmission belt structure of the present invention.

[0016] In the figure: 1. base; 2. cooling box; 3. lifting frame; 4. injection port; 5. mold mounting frame; 6. conveyor belt; 7. partition; 8. flexible curtain; 9. articulated frame; 10. guide groove; 11. motor; 12. drive shaft; 13. synchronization component; 14. connecting rod. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and 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 cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] like Figures 1 to 3 As shown, the wheel speed sensor production process of this embodiment is characterized by comprising the following steps: S1: Chip bracket injection molding, the chip bracket is injection molded by an injection molding machine. The chip bracket injection molding is divided into three sections. The temperature of the first section is 285±15℃, the temperature of the second section is 280±15℃, the temperature of the third section is 275±15℃, the pressure of the first section is 48±10bar, the speed is 45±10%, the injection section time is 2.0±0.5S, the holding pressure is 20±5bar, the speed is 10±5%, and the time is 2±0.5S; the three storage sections are 45mm or 55mm, and the cooling time before storage is 11±2S.

[0021] S2: Terminal punching, magnetic steel installation, chip, hot melting, spot welding CCD detection, continuous welding of multiple stations through the rotating worktable of the automatic turntable machine, the welding current is 1.10±0.1KA; the welding time is 30±5ms.

[0022] S3: Injection molding of the sensor head. The injection molding of the wheel speed sensor sensor head is divided into three sections. The temperature of the first section is 285±15℃, the temperature of the second section is 280±15℃, and the temperature of the third section is 275±15℃; the pressure of the first section is 48±10bar, the speed is 45±10%, and the injection time is 2.0±0.5S; the holding pressure is 20±5bar, the speed is 10±5%, and the time is 2±0.5S; the three sections of material storage are 45mm or 55mm, and the cooling time before storage is 11±2S; when the rear wheel speed sensor sensor head is injected, it is divided into three sections. The temperature of the first section is 285±15℃, the second section is stable at 280±15℃, and the temperature of the third section is 275±15℃; the pressure of the first section is 48±10bar, the speed is 45±10%, and the time is 2.0±0.5S; the holding pressure is 20±5bar, and the speed is 10±5 %, and the time is 2±0.5S; the three storage sections are 45mm or 55mm, and the cooling time before storage is 10±2S.

[0023] S4: Signal detection, the performance test bench is used to test the pulse width of the built-in chip of the sensor and the corresponding magnet. The low level is 5.9-8.4mA; the high level is 11.8-16.8mA; the duty cycle is 40%~60%, the DR-L release pulse width is 76~104μs, the DR-R release pulse width is 153~207μs, and the stop pulse width is 1.232~1.656ms.

[0024] S5: Marking: Use a laser marking machine to mark the housing of the front wheel speed sensor for easy identification.

[0025] S6: Appearance, size inspection and installation of protective sleeves. Manual inspection is carried out on the wheel speed sensor after production to ensure that there are no defects in appearance and the dimensions are in compliance. After the inspection is completed, a protective sleeve is installed on the outside of the wheel sensor for protection.

[0026] S7: Packing and warehousing: After the inspection, the wheel speed sensors that meet the standards are packaged and transported to the warehouse for storage.

[0027] Specifically, the injection molding machine includes a base 1, a lifting frame 3 is provided on the top of the base 1, a liquid injection port 4 is provided at the bottom of the lifting frame 3, a cooling box 2 is provided on the top of the base 1 on one side of the lifting frame 3, and the cooling box 2 includes a cold air exhaust fan. The cold air exhaust fan transports cold air to the inside of the cooling box 2 to keep the inside of the cooling box 2 in a low temperature state. The lifting frame 3 includes two electric push rods that can drive the liquid injection port 4 to move up and down linearly, so as to align the opening of the mold and inject the melted plastic into the mold for injection molding. When the mold is filled with raw materials, the mold is moved to the cooling point for cooling and solidification treatment.

[0028] Furthermore, two driving shafts 12 are provided inside the base 1, and the outer surfaces of the two driving shafts 12 are commonly connected to the conveyor belt 6. A motor 11 is provided at one end of any driving shaft 12, and the motor 11 drives the driving shaft 12 to rotate. The two driving shafts 12 are used in combination to make the conveyor belt 6 run.

[0029] Furthermore, two articulated frames 9 are provided on the outer surface of the conveyor belt 6, and a mold mounting frame 5 is provided at one end of the two articulated frames 9. Two connecting rods 14 are installed at both ends of the mold mounting frame 5. When the conveyor belt 6 is running, the two mold mounting frames 5 will be driven to perform linear motion with the conveyor belt 6 as the trajectory. Injection molds can be installed on the top of the two mold mounting frames 5. When one of the molds is completed by injection molding, it can be conveyed to the inside of the cooling box 2 by the conveyor belt 6, and then the other mold is transported to the bottom of the injection port 4 for injection. When the cooled mold is driven to move from the cooling box 2 to the top rear end of the base 1 for demolding, the mold that has been injected is transported to the inside of the cooling box 2 for cooling, so that the injection molding machine can perform multiple mold injection processes to improve efficiency.

[0030] Furthermore, guide grooves 10 are provided at opposite ends of the top of the base 1, and the guide grooves 10 are used in conjunction with the connecting rods 14 on both sides of the mold mounting frame 5 to limit the mold mounting frame 5, thereby ensuring that the mold mounting frame 5 can be driven by the conveyor belt 6 and located above the base 1 with the top facing upward and in a parallel state with the base 1.

[0031] Furthermore, two partitions 7 are provided at opposite ends of the base 1 below the cooling box 2, and flexible curtains 8 are provided at both ends of the cooling box 2. The flexible curtains 8 and the partitions 7 have a certain sealing effect, so that the interior of the cooling box 2 maintains a low temperature.

[0032] Furthermore, the outer surfaces of the two drive shafts 12 are commonly connected to a synchronization component 13, which includes two pulleys and belts located on the outer surfaces of the two pulleys. The two pulleys are respectively installed on the outer surfaces of the corresponding drive shafts 12. When any one of the drive shafts 12 is driven by the motor 11 to rotate, the synchronization component 13 drives the other drive shaft 12 to rotate at the same speed through the pulley and the belt.

[0033] The method of use of this embodiment is as follows: when producing the wheel speed sensor, the chip holder is first injection molded by an injection molding machine. When the chip holder of the wheel speed sensor is injection molded, the first stage temperature is 285±15℃, the second stage temperature is 280±15℃, the third stage temperature is 275±15℃, the first stage pressure is 48±10bar, the speed is 45±10%, the injection stage time is 2.0±0.5S, the holding pressure is 20±5bar, the speed is 10±5%, and the time is 2±0.5S; the three storage stages are 45mm or 55mm, and the cooling time before storage is 11±2S. After the chip holder is injection molded, the terminal is punched, the magnet is installed, the chip, hot melt, spot welding CCD detection is performed, and then the sensor head is molded and injection molded. After the injection molding is completed, the chip is installed on the chip holder, and then the terminal, magnet, chip and chip holder are installed on the sensor Signal detection is performed inside the sensor head. Among the qualified sensors, the front wheel speed sensor needs to meet the standards at the outer shell for easy distinction. Finally, the product is inspected for appearance and size. After the inspection is completed, the sheath is installed and it can be packaged and put into storage. When the injection molding machine is running, the injection mold can be installed on the top of the mold mounting frame 5. When the conveyor belt 6 is running, the two mold mounting frames 5 will be driven to perform linear movement with the guide groove 10 as the trajectory. When one of the molds is completed by injection molding, it can be conveyed to the inside of the cooling box 2 by the conveyor belt 6. At this time, the other mold is transported to the bottom of the injection port 4 for injection. When the cooled mold is driven from the cooling box 2 to the top rear end of the base 1 for demolding, the mold that has been injected is transported to the inside of the cooling box 2 for cooling, so that the injection molding machine can perform multiple mold injection processes to improve efficiency.

[0034] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A wheel speed sensor production process, characterized in that: The following steps are involved: S1: Chip bracket injection molding, the chip bracket is injection molded by an injection molding machine. When the chip bracket is injected, the injection section is divided into three sections, the temperature of the first section is 285±15℃, the temperature of the second section is 280±15℃, the temperature of the third section is 275±15℃, the pressure of the first section is 48±10bar, the speed is 45±10%, the injection section time is 2.0±0.5S, the holding pressure is 20±5bar, the speed is 10±5%, and the time is 2±0.5S; the three sections of material storage are 45mm or 55mm, and the cooling time before storage is 11±2S; S2: Terminal punching, magnetic steel installation, chip, hot melting, spot welding CCD detection, continuous welding of multiple stations through the rotating table of the automatic turntable machine, welding current is 1.10±0.1KA; welding time is 30±5ms; S3: Injection molding of the sensor head. The sensor head is injected by an injection molding machine. When the front wheel speed sensor sensor head is injected, the injection section is divided into three sections. The temperature of the first section is 285±15℃, the temperature of the second section is 280±15℃, and the temperature of the third section is 275±15℃; the pressure of the first section is 48±10bar, the speed is 45±10%, and the injection time is 2.0±0.5S; the holding pressure is 20±5bar, the speed is 10±5%, and the time is 2±0.5S; the three sections of material storage are 45mm or 55mm, and the cooling time before storage is 11±2S; when the rear wheel speed sensor sensor head is injected, the injection section is divided into three sections. The temperature of the first section is 285±15℃, the second section is stable at 280±15℃, and the temperature of the third section is 275±15℃; the pressure of the first section is 48±10bar, and the speed is 45±10 %, time is 2.0±0.5S; holding pressure is 20±5bar, speed is 10±5%, time is 2±0.5S; three-stage storage is 45mm or 55mm, and the cooling time before storage is 10±2S; S4: Signal detection, the wheel speed sensor built-in chip and its corresponding magnet are powered on and tested for pulse width through the performance test bench. The low level is 5.9-8.4mA; the high level is 11.8-16.8mA; the duty cycle is 40%~60%, the DR-L release pulse width is 76~104μs, the DR-R release pulse width is 153~207μs, and the stop pulse width is 1.232~1.656ms; S5: marking, using a laser marking machine to mark the housing of the front wheel speed sensor for easy identification; S6: Appearance, size inspection and sheath installation: Manually inspect the wheel speed sensor after production to ensure that there are no defects in appearance and the size is in compliance. After the inspection, a sheath is installed on the outside of the wheel sensor for protection; S7: Packing and warehousing: After the inspection, the wheel speed sensors that meet the standards are packaged and transported to the warehouse for storage.

2. The wheel speed sensor production process according to claim 1, characterized in that: The injection molding machine comprises a base (1) inside, a lifting frame (3) is arranged at the top of the base (1), a liquid injection port (4) is arranged at the bottom of the lifting frame (3), and a cooling box (2) is arranged at the top of the base (1) on one side of the lifting frame (3).

3. The wheel speed sensor production process according to claim 2, characterized in that: Two drive shafts (12) are arranged inside the base (1); the outer surfaces of the two drive shafts (12) are commonly connected to a conveyor belt (6); and a motor (11) is arranged at one end of any one of the drive shafts (12).

4. The wheel speed sensor production process according to claim 3, characterized in that: The outer surface of the conveyor belt (6) is provided with two hinged frames (9), one end of each of the two hinged frames (9) is provided with a mold mounting frame (5), and two connecting rods (14) are installed at both ends of each of the mold mounting frames (5).

5. The wheel speed sensor production process according to claim 2, characterized in that: The top opposite ends of the base (1) are both provided with guide grooves (10).

6. The wheel speed sensor production process according to claim 1, characterized in that: Two partitions (7) are provided at opposite ends of the base (1) below the cooling box (2), and flexible curtains (8) are provided at both ends of the cooling box (2).

7. The wheel speed sensor production process according to claim 3, characterized in that: The outer surfaces of the two drive shafts (12) are commonly connected to a synchronization component (13), the synchronization component (13) comprising two pulleys and belts located on the outer surfaces of the two pulleys, and the two pulleys are respectively mounted on the outer surfaces of the corresponding drive shafts (12).

Images