A modular combination production process with automatic error prevention

Abstract

The present invention discloses an automatic error-proof modular combination production process, which belongs to the technical field of assembly process, including damping block pressing operation, dust cover and retaining spring assembly operation, fixed end universal joint loading and flip grease injection operation, fixed end universal joint pressing operation, fixed end universal joint dust cover grease injection and clamping operation, three-ball pin universal joint pressing operation, three-column slot shell mouth rivet point operation, mobile end universal joint loading platform operation, mobile end universal joint grease injection and clamping operation, assembly weighing appearance inspection operation, code scanning and offline and packaging operation and other processes; the multiple assembly processes adopted in the present invention can automatically prevent errors in the assembly process, realize automatic loading, identification, clamping, pressing, automatic detection, sorting, diagnosis, alarm, protection and other functions of the production process, can effectively improve production efficiency and product quality, and reduce production costs and production risks.

Description

Technical Field

[0001] The present invention belongs to the technical field of assembly technology, and in particular relates to an automatic error-proof modular combination production process. Background Art

[0002] The constant velocity driveshaft assembly is a critical component in the transmission system of a passenger vehicle. Its function is to smoothly and reliably transmit power from the engine (or motor) to the vehicle's wheels, ensuring steering angles while compensating for axial length changes caused by suspension expansion and contraction, driving the vehicle and ensuring ride comfort. Existing driveshaft assembly lines lack intelligent automation and are mostly manual, requiring significant labor and production costs. Furthermore, assembly errors are prone to occur, resulting in low production efficiency and substandard product quality. Summary of the Invention

[0003] The purpose of the present invention is to provide an automatic error-proof modular combination production process to solve the problems faced in the above-mentioned background technology.

[0004] The purpose of the present invention can be achieved through the following technical solutions:

[0005] An automatic error-proof modular assembly production process is carried out in the following steps:

[0006] (1) Damping block press-fitting operation:

[0007] Place the damping block into the corresponding press-fitting equipment. The damping block is designed with a contoured tooling. The press-fitting equipment is equipped with a start switch. Press the start switch to press the real shaft inserted into the damping block mounting hole into the designated mounting position of the damping block. When the material sensor on the press-fitting equipment does not detect the presence of material on the tooling, pressing the start switch will not start the equipment. The matching press-fitting stroke and press-fitting force automatic monitoring device on the press-fitting equipment automatically monitors the press-fitting stroke and press-fitting force. When the monitoring does not meet the predetermined range, the equipment activates the sound and light alarm device to alarm and stops to wait for processing.

[0008] (2) Assembly operation of dust cover and retaining ring;

[0009] Take a fixed-end dust cover and a movable-end dust cover from the discharge port of the dust cover storage box, and place them on the corresponding dust cover profiling tooling. Hold the real shaft tightly with both hands, and insert the end of the real shaft where the circular circlip needs to be installed into the positioning concave tray of the circlip automatic assembly tooling and press it quickly. The circlip quickly slides upward along the lower conical surface of the tapered guide head and enlarges the inner diameter of the circlip so that it can be assembled into the circlip groove of the real shaft. After visually checking that the circlip is in place, hold the real shaft tightly with both hands and insert it into the small diameter of the fixed-end dust cover and the movable-end dust cover in turn.

[0010] (3) Loading and flipping grease injection of fixed end universal joint:

[0011] Press the start button on the automatic material handling table for this process, and the automatic material handling table will automatically clamp and flip the tooling 180 degrees, and move the tooling to the designated position via the feeder belt of this process. The feeder belt is equipped with a product profiling and error-proofing structure to prevent other types of products from mixing in and flowing to the greasing station. The high-precision automatic quantitative greasing machine at the greasing station will automatically start after sensing that the product has entered the designated position and complete the quantitative greasing of the product's inner cavity.

[0012] (IV) Press-fitting operation of fixed end universal joint:

[0013] Place the fixed-end universal joint into the tooling located below the equipment in this process, and place the real shaft into the tooling located above the equipment in this process. Press the start button of the equipment with both hands. The equipment starts to clamp the fixed-end universal joint and the real shaft respectively. Then the equipment moves downward and automatically adjusts the alignment of the inner and outer splines by slight rotation and presses the real shaft into the inner spline hole of the fixed-end universal joint to reach the set pressing force. Then it rises in the opposite direction and pulls until the set pulling force is reached, then stops pulling. The equipment moves downward again and maintains the pressure for three seconds under the set holding pressure to complete the press-fitting and release the product.

[0014] (5) Grease injection and clamping of the fixed end universal joint dust cover:

[0015] Place the fixed end universal joint and the real shaft that have been press-assembled above into the designated tooling for this process, manually press the fixed end dust cover down and assemble it into place, so that its small end is in the groove of the dust cover of the real shaft, start the grease injection operation, then install the large end of the dust cover into the groove of the dust cover of the outer star wheel, and finally put in the large clamp and start the clamp pliers to clamp the clamp;

[0016] (6) Press-fitting operation of tripod universal joint:

[0017] Pre-install the tripod onto the external spline at the moving end of the real shaft. After the product is placed in the designated tooling for this process, start press fitting. The ram slowly descends to apply pressure to the shaft retaining ring on the guide column, pushing the retaining ring downward continuously and guiding it onto the real shaft spline through the guide sleeve. At the same time, the guide sleeve pushes the ejector rod upward, triggering the stroke sensing switch on the equipment to start recording the downward stroke. The ram continues to press down until the retaining ring is accurately installed in the real shaft groove. The downward stroke point control switch works, stopping the equipment from continuing to press down. When the equipment stops press fitting, the infrared detection device automatically starts for detection.

[0018] (7) Operation of riveting points at the mouth of three-column trough shell:

[0019] According to the inner cavity specifications of the product, select the corresponding riveting tooling and install it on the equipment of this process. First align the raceway of the prepared three-column groove shell with the guide head of the riveting tooling, and then place it on the support block to ensure that the part is in full contact with the support block and the part cavity surface. According to the inner cavity specifications of the product, set the corresponding riveting pressure and downward displacement parameters, press the start switch to complete the riveting forming, and then take out the product. Use the raceway diameter go and no-go gauge to check the diameter of the riveted mouth. If it is within the qualified size range, the part is a qualified riveted product. If the size does not meet the requirements, re-riveting is performed.

[0020] (8) Operation of the universal joint loading platform on the mobile end:

[0021] This process is equipped with an automatic material sorting table and a conveyor belt, through which the products are transferred to the assembly station;

[0022] (IX) Grease injection and clamping operation of the universal joint at the mobile end:

[0023] Place the product into the designated tooling for this process. After sensing the product, the equipment will automatically start the circlip detection and then the grease injection operation. Then, install the small and large ends of the dust cover on the mobile end into the designated dust cover grooves of the real shaft and the three-column groove shell respectively. Finally, insert the small and large clamps and start the clamp pliers to clamp the clamps.

[0024] (10) Assembly weighing and appearance inspection operation:

[0025] Place the assembled product on the weighing fixture and press the button to start the weighing operation. When the device senses the product, it starts weighing. If the weighing result is out of tolerance, the field light alarm will be automatically activated. The qualified product will be taken out and placed on the appearance inspection fixture for 360° rotation inspection, and the corresponding barcode label will be affixed.

[0026] (11) Scan the QR code to go offline and pack:

[0027] Use a barcode scanner to scan the product and automatically upload the relevant information to the computer for storage. Then remove the product from the appearance inspection tooling and frame the scanned products in the packaging area.

[0028] Beneficial effects of the present invention:

[0029] The present invention installs different sensors to monitor changes in key parameters during the assembly process in real time, ensuring that the assembly process is controlled in accordance with specifications. By detecting parameters such as missing parts, appearance, and position during the assembly process, abnormal conditions can be detected in a timely manner and the operation can be stopped. At the same time, relevant data during the assembly process is monitored and diagnosed in real time, problems are detected in a timely manner, and sound and light alarms are issued, thereby improving production efficiency and product quality.

[0030] The multiple assembly processes adopted in the present invention can automatically prevent errors in the assembly process, and realize functions such as automatic loading, identification, clamping, pressing, automatic detection, sorting, diagnosis, alarm, and protection in the production process, which can effectively improve production efficiency and product quality, reduce production costs and production risks, and this assembly process can realize the intelligence, automation and efficiency of the production process, reduce the assembly error rate and cost, improve production efficiency and product quality, and reduce the output of labor costs and production costs.

[0031] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. 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 creative work.

[0033] Figure 1 It is a flow chart of the assembly process of the present invention.

[0034] Description of the accompanying drawings:

[0035] 1. Damping block installation operation; 2. Dust cover and retaining spring assembly operation; 3. Fixed end universal joint loading and flip greasing operation; 4. Fixed end universal joint press-fit operation; 5. Fixed end universal joint dust cover greasing and clamping operation; 6. Tri-ball universal joint press-fit operation; 7. Three-column slot shell mouth rivet point operation; 8. Mobile end universal joint loading platform operation; 9. Mobile end universal joint greasing and clamping operation; 10. Assembly weighing and appearance inspection operation; 11. QR code scanning and packaging operation. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making any creative efforts shall fall within the scope of protection of the present invention.

[0037] like Figure 1 As shown, the present invention discloses an automatic error-proof modular combination production process, which specifically includes the following steps:

[0038] (1) Damping block installation operation (1):

[0039] Place the damping block into the corresponding pressing equipment. The damping block is designed with a contoured tooling and the pressing equipment is installed with a start switch. Press the start switch to press the real shaft inserted into the mounting hole of the damping block into the specified installation position of the damping block. When the material sensor on the pressing equipment does not detect the presence of material on the tooling, pressing the start switch cannot start the equipment. The matching pressing stroke and pressing force automatic monitoring device on the pressing equipment automatically monitors the pressing stroke and pressing force. When the monitoring does not meet the predetermined range, the equipment starts the sound and light alarm device to alarm and stops to wait for processing.

[0040] In this process, the real shaft can be pressed into the designated installation position of the damping block by pressing the start switch of the pressing equipment of this process with both hands. When the material sensor does not detect the presence of assembly material on the tooling, the equipment cannot be started for pressing even if the start switch of the equipment is pressed with both hands. This can avoid the equipment running dry and causing injuries to the operators; the automatic monitoring device for the pressing stroke and the automatic monitoring device for the pressing force can automatically monitor the operation process. When it is detected that the pressing stroke exceeds or falls short of the standard setting, or the pressing force exceeds or falls short of the standard setting, an alarm will be sounded through the sound and light alarm device and the machine will be shut down for processing. This can avoid the damping block pressing position from being out of tolerance and can effectively identify the mixing of real shafts; the damping block is designed with a contoured tooling, so that damping blocks of different models and different external structures cannot be normally placed in the tooling, effectively avoiding the mixing of damping blocks with similar appearances or multiple models.

[0041] (2) Dust cover and retaining ring assembly operation (2):

[0042] The operator takes a fixed-end dust sleeve and a movable-end dust sleeve from the discharge port of the dust sleeve storage box at the same time, and places them on the corresponding dust sleeve profiling tooling. Holding the real shaft tightly with both hands, the end of the real shaft that needs to be installed with the circular circlip is inserted into the positioning concave tray of the circlip automatic assembly tooling and pressed down quickly. The circlip slides upward quickly along the lower conical surface of the tapered guide head and expands the inner diameter of the circlip so that it can be assembled into the circlip groove of the real shaft. After visually checking that the circlip is in place, hold the real shaft tightly with both hands and insert it into the small diameter of the fixed-end dust sleeve and the movable-end dust sleeve in turn.

[0043] The assembly table of this process is designed with independent fixed-end dust cover and movable-end dust cover storage boxes, and is matched with corresponding contoured assembly tooling, so that only products with the same dust cover size and corrugation can be placed in the tooling normally, avoiding the mixing of dust covers and the reverse problem of fixed-end dust cover and movable-end dust cover; at the same time, the assembly table of this process is designed with automatic loading and assembly functions of retaining springs, which can effectively identify the inner and outer diameter tolerances of circular retaining springs, avoid the mixing or wrong material of circular retaining springs, and ensure that the retaining springs are evenly expanded and deformed during the assembly process, effectively avoiding the problem of inconsistent deformation caused by traditional manual assembly of retaining springs, thereby ensuring the batch assembly quality of retaining springs, and improving the assembly efficiency of retaining springs, realizing error-proof, efficient, automatic and accurate assembly of circular retaining springs.

[0044] (III) Loading and turning grease injection of fixed end universal joint (3):

[0045] Press the start button on the automatic material sorting table for this process, and the automatic material sorting table will automatically clamp and flip the tooling 180° (the product cavity faces downward during loading, and the inner cavity faces upward after clamping and flipping, which is convenient for subsequent grease injection operations), and move the tooling to the designated position through the feeder belt of this process. The feeder belt is equipped with a product profiling and error-proofing structure to prevent other types of products from mixing in and flowing to the grease injection station. The high-precision automatic quantitative grease injection machine on the grease injection station will automatically start after sensing that the product has entered the designated position, and complete the quantitative grease injection into the product cavity.

[0046] This process is matched with an automatic material sorting table and a feeding belt, and is designed with a high-precision automatic quantitative grease injection machine. The feeding belt is provided with a product profiling and error-proofing structure, so that products with the same appearance can pass through, otherwise they cannot pass through, thus preventing other models of products from mixing and flowing to the grease injection station. The high-precision automatic quantitative grease injection machine is matched with a material sensor, and grease injection can only be started after sensing that the product has correctly entered the grease injection station. At the same time, it has automatic sound and light alarm functions for missed grease injection, repeated grease injection, small or large amount of grease injection, which facilitates accurate grease injection and can keep the product clamped at the same time, thus ensuring that unqualified grease-injected products cannot be normally removed from the grease injection station.

[0047] (IV) Press-fitting operation of fixed end universal joint (4):

[0048] Place the fixed-end universal joint into the tooling located below the equipment in this process, and place the real shaft into the tooling above the equipment in this process. Press the start button of the equipment with both hands. The equipment starts to clamp the fixed-end universal joint and the real shaft respectively. Then the equipment moves downward and automatically adjusts the alignment of the inner and outer splines by slight rotation and presses the real shaft into the inner spline hole of the fixed-end universal joint to reach the set pressing force. Then it rises in the opposite direction and pulls until the set pulling force is reached, then stops pulling. The equipment moves downward again and maintains the pressure for three seconds under the set holding pressure to complete the press-fitting and release the product.

[0049] The assembly equipment for this process is equipped with automatic rotation and spline alignment functions to ensure that the splines of the real shaft and the fixed-end universal joint can be automatically aligned in any orientation when placed in the tooling, avoiding press-fitting damage to the splines or failure to press in caused by misalignment between the real shaft's external spline and the fixed-end universal joint's internal spline. At the same time, the assembly equipment for this process is equipped with dual monitoring devices for press-fitting stroke and press-fitting force to ensure that the real shaft press-fitting position and press-fitting force are correct, so as to ensure that unqualified spline processing products or mixed products can be 100% identified.

[0050] (5) Grease the dust cover of the fixed end universal joint and clamp the clamp (5):

[0051] Place the fixed-end universal joint and real shaft that have been pressed together into the designated tooling for this process, manually press the fixed-end dust cover down and into place so that its small end is in the groove of the real shaft dust cover, start the grease injection operation, then install the large end of the dust cover into the groove of the dust cover of the outer star wheel, finally put in the large clamp and start the clamp pliers to clamp the clamp.

[0052] The assembly equipment for this process is also equipped with a high-precision automatic quantitative grease injection machine for grease injection operations; the clamp pliers use an electric clamp clamping method, which solves the problem of clamping force fluctuation caused by unstable air pressure in pneumatic calipers; the electric calipers can be designed with a clamping force monitoring device to avoid excessive clamping force damaging the clamp, or the clamping force does not meet the requirements, affecting the loosening and oil leakage during product assembly and use.

[0053] (6) Press-fitting operation of tripod universal joint (6):

[0054] Pre-install the tripod onto the external spline at the moving end of the real shaft. Place the product into the designated tooling for this process and start press-fitting. The ram slowly descends to apply pressure to the shaft retaining ring on the guide column, pushing the retaining ring downward continuously and guiding it onto the real shaft spline through the guide sleeve. At the same time, the guide sleeve pushes the ejector rod upward, triggering the stroke sensing switch on the equipment to start recording the downward stroke. The ram continues to press down until the retaining ring is accurately installed in the real shaft groove. The downward stroke point control switch works, stopping the equipment from continuing to press down. When the equipment stops press-fitting, the infrared detection device is automatically started for detection.

[0055] The assembly equipment of this process is designed with retaining rings and guide sleeves, which can realize automatic loading of retaining rings and avoid over-loading or missing loading. The guide sleeve adopts a conical design to ensure that each retaining ring is evenly expanded and pressed into the real shaft retaining ring groove during batch production, effectively avoiding the problem of the retaining ring not being able to rebound normally due to abnormal expansion and deformation during the pressing process. When the equipment stops pressing, the external detection device is automatically started for detection. When the infrared light cannot pass through the φ1.0mm detection hole on the pressure head, it indicates that the retaining ring has been assembled in place without any undesirable phenomena such as skewness, assembly deformation, and inaccurate insertion into the groove. The counterweight buzzer on the assembly equipment of this process does not start the alarm. Otherwise, the equipment starts the buzzer to sound and light alarm, so as to ensure precise assembly.

[0056] (7) Operation of riveting points on the mouth of three-column trough shell (7):

[0057] According to the specifications of the inner cavity of the product, select the corresponding riveting tooling and install it on the equipment of this process. First align the raceway of the prepared three-column groove shell with the guide head of the riveting tooling, and then place it on the support block to ensure that the part is in full contact with the support block and the part cavity surface. According to the specifications of the inner cavity of the product, set the corresponding riveting pressure and downward displacement parameters, press the start switch to complete the riveting forming, and then take out the product. Use the go and no-go gauge of the raceway diameter to check the diameter after riveting. If it is within the qualified size range, the part is a qualified riveted product. If the size does not meet the requirements, re-riveting is performed.

[0058] The assembly equipment of this process is mainly for products that need to be riveted at the mouth of the three-column groove shell. The riveting tooling adopts an integrated design, which can complete the riveting of twelve points on the three ball channels and six ball channel side walls in one riveting, effectively avoiding the problems of missed riveting or inconsistent riveting positions during mass production. At the same time, the design and use of the riveting tooling ensures that the rivet position of each product in mass production is consistent, visually uniform and beautiful.

[0059] (VIII) Operation of the universal joint loading platform on the mobile end (8):

[0060] This process is equipped with an automatic material sorting table and a conveyor belt, and the products are transferred to the assembly station through the conveyor belt of this process.

[0061] This process is the same as the loading and flipping greasing operation of the fixed-end universal joint. It is used to transport the product to the assembly station. The feeding belt on the assembly equipment is also equipped with a product profiling and error-proofing structure to correct product errors and prevent other models of products from mixing in and being transferred to the assembly station.

[0062] (IX) Grease injection and clamping operation of the universal joint at the mobile end (9):

[0063] Place the product into the designated tooling for this process. After sensing the product, the equipment will automatically start the circlip detection, and then start the grease injection operation. Then, install the small and large ends of the dust cover on the mobile end into the designated dust cover grooves of the real shaft and the three-column groove shell respectively. Finally, put in the small and large clamps and start the clamp pliers to clamp the clamps.

[0064] The assembly equipment of this process is equipped with an automatic visual detection device for retaining springs. When the retaining springs on the three-column groove shell are not detected, an audible and visual alarm will be automatically activated and the next action will be stopped to wait for manual processing, thereby reducing the occurrence of safety accidents.

[0065] (10) Assembly weighing and visual inspection operation (10):

[0066] Place the assembled product on the weighing fixture and press the button to start the weighing operation. When the equipment senses the product, it starts weighing. If the weighing result is out of tolerance, the sound and light alarm will be automatically activated. The qualified product will be taken out and placed on the appearance inspection fixture for 360° rotation inspection, and the corresponding barcode label will be affixed.

[0067] This process weighs and inspects the assembled product. If the weighing result is out of tolerance, the equipment equipped in this process will automatically activate the sound and light alarm to remind the operator and keep the product in the clamped state (the product cannot be removed normally) waiting for processing. It can effectively identify problems such as missing parts and grease injection in the constant velocity drive shaft assembly.

[0068] (11) Scan the QR code to go offline and pack the goods (11):

[0069] Use a barcode scanner to scan the product and automatically upload the relevant information to the computer for storage. Then remove the product from the appearance inspection tooling and frame the scanned products in the packaging area.

[0070] The equipment equipped in this process is also equipped with an automatic sound and light alarm device. When the code is not scanned or scanned repeatedly, the equipment will automatically activate the sound and light alarm to remind the operator and keep the product in the clamping state (the product cannot be taken out normally) waiting for processing, effectively avoiding problems such as going offline without completing the code scanning, repeated scanning, and repeated coding.

[0071] The present invention installs different sensors to monitor changes in key parameters during the assembly process in real time, ensuring that the assembly process is controlled in accordance with specifications. By detecting parameters such as missing parts, appearance, and position during the assembly process, abnormal conditions can be detected in a timely manner and the operation can be stopped. At the same time, relevant data during the assembly process is monitored and diagnosed in real time, problems are detected in a timely manner, and sound and light alarms are issued, thereby improving production efficiency and product quality.

[0072] The assembly process adopted by the present invention can automatically prevent errors in the assembly process, and realize functions such as automatic loading, identification, clamping, pressing, automatic detection, sorting, diagnosis, alarm, and protection in the production process, which can effectively improve production efficiency and product quality, reduce production costs and production risks, and this assembly process can realize the intelligence, automation and efficiency of the production process, reduce the assembly error rate and cost, improve production efficiency and product quality, and reduce the output of labor costs and production costs.

[0073] The above content is merely an example and explanation of the concept of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. A modular combination production process with automatic error prevention, characterized in that: Follow these steps: (1) Damping block press-fitting operation: Place the damping block into the corresponding press-fitting equipment. A contoured tooling is designed on the damping block. A start switch is installed on the press-fitting equipment. Press the start switch to press the real shaft inserted into the damping block mounting hole into the designated mounting position of the damping block. When the material sensor on the press-fitting equipment does not detect the presence of material on the tooling, pressing the start switch will fail to start the equipment. The matching press-fitting stroke and press-fitting force automatic monitoring device on the press-fitting equipment automatically monitors the press-fitting stroke and press-fitting force. When the monitoring does not meet the predetermined range, the equipment activates the sound and light alarm device to alarm and stops waiting for processing. (2) Assembly operation of dust cover and retaining ring: Take a fixed-end dust cover and a movable-end dust cover from the discharge port of the dust cover storage box, and place them on the corresponding dust cover profiling tooling. Hold the real shaft tightly with both hands, and insert the end of the real shaft where the circular circlip needs to be installed into the positioning concave tray of the circlip automatic assembly tooling and press it quickly. The circlip quickly slides upward along the lower conical surface of the tapered guide head and enlarges the inner diameter of the circlip so that it can be assembled into the circlip groove of the real shaft. After visually checking that the circlip is in place, hold the real shaft tightly with both hands and insert it into the small diameter of the fixed-end dust cover and the movable-end dust cover in turn. (III) Loading and flipping grease injection of fixed end universal joint: Press the start button on the automatic material handling table for this process, and the automatic material handling table will automatically clamp and flip the tooling 180 degrees, and move the tooling to the designated position via the feeder belt of this process. The feeder belt is equipped with a product profiling and error-proofing structure to prevent other types of products from mixing in and flowing to the greasing station. The high-precision automatic quantitative greasing machine at the greasing station will automatically start after sensing that the product has entered the designated position and complete the quantitative greasing of the product's inner cavity. (IV) Fixed end universal joint press-fitting operation: Place the fixed-end universal joint into the tooling located below the equipment in this process, and place the real shaft into the tooling located above the equipment in this process. Press the start button of the equipment with both hands. The equipment starts to clamp the fixed-end universal joint and the real shaft respectively. Then the equipment moves downward and automatically adjusts the alignment of the inner and outer splines by slight rotation and presses the real shaft into the inner spline hole of the fixed-end universal joint to reach the set pressing force. Then it rises in the opposite direction and pulls until the set pulling force is reached, then stops pulling. The equipment moves downward again and maintains the pressure for three seconds under the set holding pressure to complete the press-fitting and release the product. (V) Grease the dust cover of the fixed end universal joint and clamp the clamp: Place the fixed end universal joint and the real shaft that have been press-assembled above into the designated tooling for this process, manually press the fixed end dust cover down and assemble it into place so that its small end is in the groove of the real shaft dust cover, start the grease injection operation, then install the large end of the fixed end dust cover into the groove of the dust cover of the outer star wheel, finally put in the large clamp and start the clamp pliers to clamp the clamp; (6) Press-fitting operation of tripod universal joint: Pre-install the tripod onto the external spline at the moving end of the real shaft. After the product is placed in the designated tooling for this process, start press fitting. The ram slowly descends to apply pressure to the shaft retaining ring on the guide column, pushing the retaining ring downward continuously and guiding it onto the real shaft spline through the guide sleeve. At the same time, the guide sleeve pushes the ejector rod upward, triggering the stroke sensing switch on the equipment to start recording the downward stroke. The ram continues to press down until the retaining ring is accurately installed in the real shaft groove. The downward stroke point control switch works, stopping the equipment from continuing to press down. When the equipment stops press fitting, the infrared detection device automatically starts for detection. (VII) Operation of riveting points at the mouth of three-column trough shell: According to the inner cavity specifications of the product, select the corresponding riveting tooling and install it on the equipment of this process. First align the raceway of the prepared three-column groove shell with the guide head of the riveting tooling, and then place it on the support block to ensure that the part is in full contact with the support block and the part cavity surface. According to the inner cavity specifications of the product, set the corresponding riveting pressure and downward displacement parameters, press the start switch to complete the riveting forming, and then take out the product. Use the raceway diameter go and no-go gauge to check the diameter of the riveted mouth. If it is within the qualified size range, the part is a qualified riveted product. If the size does not meet the requirements, re-riveting is performed. (8) Operation of the universal joint loading platform on the mobile end: This process is equipped with an automatic material sorting table and a conveyor belt, through which the products are transferred to the assembly station; (IX) Grease injection and clamping operation of the universal joint at the mobile end: Place the product into the designated tooling for this process. After sensing the product, the equipment will automatically start the circlip detection and then the grease injection operation. Then, install the small and large ends of the dust cover on the moving end into the designated dust cover grooves of the real shaft and the three-column groove shell respectively. Finally, insert the small and large clamps and start the clamp pliers to clamp the clamps. (10) Assembly weighing and appearance inspection operation: Place the assembled product on the weighing fixture and press the button to start the weighing operation. When the device senses the product, it starts weighing. If the weighing result is out of tolerance, the field light alarm will be automatically activated. The qualified product will be taken out and placed on the appearance inspection fixture for 360° rotation inspection, and the corresponding barcode label will be affixed. (11) Scan the QR code to go offline and pack: Use a barcode scanner to scan the product and automatically upload the relevant information to the computer for storage. Then remove the product from the appearance inspection tooling and frame the scanned products in the packaging area.

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