A machining device and method for a mold-moving cylinder piston rod.

Abstract

This invention relates to the field of piston rod processing technology, providing a processing device and method for a moving mold cylinder piston rod. The device includes a worktable and guide plates mounted on the left and right sides of the top of the worktable. A partition plate is installed at the rear of the top of the guide plates. A hexagonal rotary extrusion device is provided at the rear of the top of the right guide plate, and a constraint expansion ring assembly is provided at the rear of the top of the left guide plate. The constraint expansion ring assembly includes a positioning platform installed at the rear of the top of the guide plates. A double-arm support frame is installed at the front of the top of the positioning platform. Fitting cylinders are installed on both the left and right sides of the top of the double-arm support frame. A hollow extension rod is provided inside the fitting cylinder on the right side. In use, this invention applies controllable pre-expansion to the hole wall after rotary extrusion molding to offset residual extrusion stress within the hole wall, thus solving the deformation problems caused by hole opening shrinkage and stress rebound in subsequent processes.

Description

Technical Field

[0001] This invention relates to the field of piston rod processing technology, and more specifically, to a processing apparatus and method for a moving mold cylinder piston rod. Background Technology

[0002] The mold-moving cylinder is a core actuator in equipment such as two-platen injection molding machines and large die-casting machines, which realizes the mold opening and closing actions. The piston rod of the mold-moving cylinder is a key component for power transmission. The front end of the piston rod is connected to the moving platen. Under hydraulic drive, it drives the moving platen to move back and forth to complete the mold closing and opening work. Therefore, the machining accuracy and surface quality of the piston rod are crucial to the assembly and operational stability of the cylinder.

[0003] The piston rod end needs to be machined with an internal hexagonal hole for assembly, locking and anti-rotation. The coaxiality and forming contour accuracy of the internal hexagonal hole directly determine the coaxiality of the piston rod assembly and the reliability of long-term reciprocating force.

[0004] The existing piston rod end face hexagonal internal forming process adopts a pre-drilled bottom hole followed by axial spin extrusion forming process. The workpiece is locked and fixed, and the hexagonal processing device actively rotates and feeds for extrusion. After the forming is completed, due to the violent plastic flow of the metal during the spin extrusion process, the material undergoes elastic aftereffect recovery after unloading. The six planes of the internal hexagonal hole will uniformly shrink inward, forming a closing defect. This closing defect causes the opposite side size of the internal hexagonal hole to shrink and the edge position to shift, directly affecting the locking assembly accuracy.

[0005] Existing improvement methods mainly reduce the shrinkage by controlling process parameters such as extrusion speed and holding time. However, due to the inherent physical characteristics of material elastic aftereffect, parameter adjustments can only provide limited improvement and cannot fundamentally eliminate the shrinkage trend, resulting in a high defect rate.

[0006] Therefore, this application proposes a machining device and method for a mold-moving cylinder piston rod to solve the above problems. Summary of the Invention

[0007] Technical problem to be solved: In view of the problems existing in the prior art, the purpose of this invention is to provide a processing device and method for a moving mold cylinder piston rod, which solves the extrusion stress remaining in the inner hexagonal hole wall at the end of the piston rod after spin extrusion, so as to avoid the hole deformation caused by the stress and the stress rebound problem in subsequent processes.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a processing device and method for a moving mold cylinder piston rod, comprising a worktable and guide plates installed on the left and right sides of the top of the worktable, wherein a partition plate is installed at the rear of the top of the guide plate; a hexagonal extrusion device is provided at the rear of the top of the right guide plate, and a constraint expansion ring assembly is provided at the rear of the top of the left guide plate, wherein an air supply and exhaust assembly is provided on the constraint expansion ring assembly; the constraint expansion ring assembly comprises: a positioning platform installed at the rear of the top of the guide plate, a double-arm support frame is installed at the front of the top of the positioning platform, and fitting cylinders are installed on the left and right sides of the top of the double-arm support frame; a hollow extension rod is provided inside the fitting cylinder on the right side, and six outward sliding plates are circumferentially sliding on the inner wall of the front part of the hollow extension rod, and an abutment plate is installed on the outward side of each outward sliding plate; when the hollow extension rod extends into the internal hexagonal hole at the end of the piston rod, the air supply and exhaust assembly drives the outward sliding plates to move the abutment plates to outwardly tighten the hole wall of the internal hexagonal hole, causing it to produce an outward pre-expansion deformation.

[0009] Furthermore, the front end of the right-side fitting cylinder is provided with an oil lubrication assembly, which includes an auxiliary cylinder, an inner ring guide tube, an immersion ring, and a metering oil valve. The auxiliary cylinder is threadedly installed at the front end of the right-side fitting cylinder. An inner ring guide tube is installed inside the auxiliary cylinder, and an immersion ring is installed on the inner ring wall of the auxiliary cylinder. The metering oil valve is installed at the top of the auxiliary cylinder and is connected to the oil inlet at the top of the inner ring guide tube. The oil outlet end of the inner ring guide tube extends into the immersion ring to guide the lubricating oil to the immersion ring. The immersion ring is used to coat the surface of the contact plate with lubricating oil when the contact plate retracts.

[0010] Furthermore, the air supply and exhaust assembly includes: an air inlet and an exhaust outlet, which are respectively opened on the left and right sides of the rear end of the hollow extension rod; a one-way valve, which is respectively installed at the air inlet and exhaust outlet of the air supply and exhaust assembly; an air supply and exhaust pipe, which includes an air inlet pipe and an exhaust pipe, one end of which is respectively connected to the corresponding one-way valve; and a hollow groove, which is opened on the double-arm support frame and the right-side mounting cylinder for the air supply and exhaust pipe to pass through.

[0011] Furthermore, a detection component is provided inside the fitting cylinder on the left side. The detection component includes: a detection rod, which is slidably installed inside the fitting cylinder on the left side; a detection probe, which is installed at the front end of the detection rod and is used to detect the state of the hole wall of the internal hexagonal hole; and an oil cleaning ring, which is sleeved on the front part of the detection rod.

[0012] Furthermore, a cylinder is installed at the rear end of the positioning platform, and a push plate is installed at the telescopic end of the cylinder. The push plate is slidably installed inside the left and right fitting cylinders. Hollow extension rods and detection extension rods are installed on the left and right sides of the push plate.

[0013] Furthermore, a first hole is provided on the front right side of the partition plate, and two parallel second holes are provided on the front left side of the partition plate; the two second holes are respectively coaxially arranged with the corresponding side of the fitting cylinder.

[0014] Furthermore, a correction component is provided on the lower front side of the second hole on the right side. The correction component includes: two parallel cylinders installed at the front end of the partition plate and symmetrically arranged on the left and right sides of the lower part of the second hole on the right side; a built-in motor installed inside the parallel cylinder; a flexible contact shaft rotatably installed at the front end of the parallel cylinder; and a vision sensor installed at the front end of the hollow extension rod.

[0015] Furthermore, a three-slotted plate is installed at the front center of the guide plate, and receiving notches are equally spaced on the three-slotted plate. A transport component for lifting the piston rod is provided inside the three-slotted plate. The transport component uses a double-headed motor, connecting rod and lifting plate to lift the piston rod placed in the receiving notch and move it to the next receiving notch.

[0016] Furthermore, the guide plate has a pusher component at the front of its top end. The pusher component is equipped with a boss, a second cylinder, and an end pressure plate to push and lock the front end of the piston rod in the receiving notch. The partition plate has pressing components on the left and right sides of its front end. The pressing components are equipped with a frame, a third cylinder, and a pressing plate to press the piston rod located in the receiving notch.

[0017] A method of using a machining device for a mold-moving cylinder piston rod includes the following steps: S1. The transport component transports the piston rod with the end hole punched to the hexagonal spin extrusion unit station. The pushing component and the pressing component cooperate to position and lock the piston rod. The hexagonal spin extrusion unit performs spin extrusion forming of the piston rod end with an internal hexagonal hole. S2. The pusher and presser parts at the hexagonal rotary extrusion device are released, and the transport part transports the piston rod to the constraint expansion ring assembly station, where it is again positioned and locked by the pusher and presser parts. S3. The visual sensor on the hollow extension rod collects the position information of the internal hexagonal hole, and the correction component corrects the position of the piston rod end so that the internal hexagonal hole is aligned with the contact plate; S4. The cylinder drives the push plate to push the hollow extension rod through the second hole and into the internal hexagonal hole. The air supply and exhaust assembly drives the outer moving plate to push the contact plate outward to tighten the internal hexagonal hole wall, so that the hole wall produces outward pre-expansion deformation and establishes a reverse stress field in the hole wall to counteract the axial compressive stress remaining in the hole wall after spin extrusion, thereby preventing the hole opening from shrinking and deforming. S5. After the contact plate completes the pre-expansion and pressure holding, it retracts and resets. The lubrication component evenly coats the support working surface of the contact plate with lubricating oil to form a continuous lubricating film, which is used to reduce the contact friction between the contact plate and the inner hexagonal hole wall during subsequent insertion operations. S6. The transport component moves the piston rod to the next station. The detection rod extends into the internal hexagonal hole, and the detection probe detects the condition of the hole wall. The oil cleaning ring scrapes off the residual oil when the detection rod retracts. After the test is completed, the oil is transported to the external collection.

[0018] Beneficial effects: Compared with the prior art, the advantages of the present invention are as follows: 1. The present application sets up a spin extrusion molding station, a constraint expansion ring station, a lubrication and maintenance station and a testing station, and adopts a four-station linkage method. After spin extrusion molding, the constraint expansion ring assembly is used to apply controllable pre-expansion to the hole wall, and establishes a reverse stress field opposite to the direction of the residual stress of spin extrusion, so that the extrusion stress remaining in the hole wall can be offset, thereby avoiding the hole shrinkage problem caused by the stress.

[0019] 2. By setting up a constraint expansion ring assembly and an air supply and exhaust assembly, the constraint expansion ring assembly consists of a positioning platform, a double-arm support frame, and a mounting cylinder forming a support base. Six outward sliding plates are installed circumferentially inside the hollow extension rod, and an abutment plate is installed on the outer side of each outward sliding plate. In conjunction with the air supply and exhaust assembly, high-pressure gas is injected into the front cavity of the hollow extension rod, driving the six abutment plates to simultaneously tighten the six planes of the inner hexagonal hole, so as to achieve uniform force on each plane and solve the problem of uneven force on the hole wall caused by single-point force application.

[0020] 3. By setting up a lubrication assembly, the inner ring guide tube, the immersion ring and the metering oil valve are integrated into one unit using an auxiliary cylinder. When the contact plate retracts, the surface slides in contact with the immersion ring and is evenly coated with a lubricating oil film, which solves the problem of inconsistent surface lubrication state during repeated reciprocating operations of the contact plate, resulting in unstable transmission of the clamping force.

[0021] 4. By setting up a detection component, the detection probe and the oil cleaning ring are integrated at the front end of the detection extension rod. When it extends, the condition of the hole wall is detected. When it retracts, the oil cleaning ring absorbs and carries away the residual oil from the hole wall. This achieves simultaneous operation of quality detection and residual oil removal, and solves the problem of residual oil in the hole contaminating subsequent processes after detection.

[0022] 5. By setting up a calibration component, the visual sensor is used to collect the orientation information of the hexagonal hole edge, and the two flexible contact shafts are controlled to rotate in the same direction to drive the piston rod to rotate, so that the orientation of the hexagonal hole edge is aligned with the outline of the contact plate, which solves the problem of uncertain edge orientation when the piston rod is secondarily positioned after being stepped through the transport component. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0024] Figure 2This is a three-dimensional structural diagram of the present invention from another perspective.

[0025] Figure 3 This is a schematic diagram of the spacing three-card plate structure of the present invention.

[0026] Figure 4 This is a schematic diagram of the partition plate structure of the present invention.

[0027] Figure 5 This is a schematic diagram of the positioning stage structure of the present invention.

[0028] Figure 6 This is a schematic diagram of the constraint expansion ring component structure of the present invention.

[0029] Figure 7 This is a schematic diagram of the air supply and exhaust assembly structure of the present invention.

[0030] Figure 8 This is a schematic diagram of the internal structure of the hollow extension rod of the present invention.

[0031] Figure 9 This is a schematic diagram of the lubrication component structure of the present invention.

[0032] Figure 10 This is a schematic diagram of the detection component structure of the present invention.

[0033] Figure 11 This is a schematic diagram of the correction component structure of the present invention.

[0034] The attached diagram is labeled as follows: 1. Workbench; 2. Guide plate; 3. Divider plate; 31. First hole; 32. Second hole; 4. Hexagonal rotary extrusion device; 5. Constraint expansion ring assembly; 51. Positioning table; 511. Cylinder 1; 512. Push plate; 52. Double arm support frame; 53. Assembly cylinder; 54. Hollow extension rod; 55. Outward moving plate; 56. Contact plate; 6. Air supply and exhaust assembly; 61. Air inlet and exhaust port; 62. Check valve; 63. Air inlet and exhaust pipe; 64. Hollowed-out groove; 7. Lubrication assembly; 71. Auxiliary cylinder; 72. Inner ring guide pipe; 73. Immersion ring; 74. Metering valve; 8. Detection assembly; 81. Detection rod; 82. Detection probe; 83. Oil cleaning ring; 9. Correction assembly; 91. Parallel cylinder; 92. Built-in motor; 93. Flexible contact shaft; 94. Vision sensor; 10. Spacing of three card plates; 101. Receiving notch. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0036] This application provides a processing device and method for a moving mold cylinder piston rod, which solves the problem of residual extrusion stress in the inner hexagonal hole wall at the end of the piston rod after spin extrusion, thereby avoiding the hole deformation caused by the stress and the stress rebound problem in subsequent processes. When in use, the invention applies controllable pre-expansion to the hole wall after spin extrusion to offset the residual extrusion stress in the hole wall, thus solving the problems of hole closing and deformation caused by stress rebound in subsequent processes.

[0037] The technical solutions in this application are intended to solve the above-mentioned technical problems, and the overall approach is as follows.

[0038] Example 1, please refer to Figures 1-11 This embodiment provides a processing device for a moving mold cylinder piston rod, including a worktable 1 and guide plates 2 installed on the left and right sides of the top of the worktable 1. A partition plate 3 is installed at the rear of the top of the guide plates 2. A hexagonal extrusion device 4 is provided at the rear of the top of the right guide plate 2, and a constraint expansion ring assembly 5 is provided at the rear of the top of the left guide plate 2. The constraint expansion ring assembly 5 is provided with a supply and exhaust assembly 6. The constraint expansion ring assembly 5 includes a positioning platform 51 installed at the rear of the top of the guide plate 2. A double-arm support frame 52 is installed at the front of the top. A mounting cylinder 53 is installed on both the left and right sides of the top of the double-arm support frame 52. A hollow extension rod 54 is provided inside the right mounting cylinder 53. Six outward sliding plates 55 are circumferentially sliding on the inner wall of the front part of the hollow extension rod 54. A contact plate 56 is installed on the outward side of each outward sliding plate 55. When the hollow extension rod 54 extends into the internal hexagonal hole at the end of the piston rod, the air supply and exhaust assembly 6 drives the outward sliding plate 55 to drive the contact plate 56 to stretch outward and tighten the hole wall of the internal hexagonal hole, causing it to produce outward pre-expansion deformation.

[0039] In this embodiment, a constraint expansion ring assembly 5 is set on the rear side of the top of the left guide plate 2. The support and installation base is formed by the positioning platform 51, the double-arm support frame 52, and the left and right side mounting cylinders 53. A hollow extension rod 54 is slidably installed inside the right side mounting cylinder 53. Six outward sliding plates 55 are circumferentially slidably installed on the inner wall of the front part of the hollow extension rod 54. Each outward sliding plate 55 has an abutment plate 56 installed on one side outward. The air supply and exhaust assembly 6 provides driving power. When the hollow extension rod 54 extends into the internal hexagonal hole at the end of the piston rod, the air supply and exhaust assembly 6 fills the front cavity of the hollow extension rod 54 with high-pressure gas, driving the six outer moving plates 55 to slide outward synchronously in the radial direction. This causes the contact plate 56 to simultaneously support the six planar hole walls of the internal hexagonal hole, causing the hole wall to undergo outward pre-expansion deformation. The above structure, by applying controllable pre-expansion to the internal hexagonal hole wall after spin extrusion, establishes a stress field in the hole wall opposite to the direction of the residual stress from spin extrusion. This solves the problem of orifice shrinkage caused by the high-strength elastic aftereffect of 42CrMo quenched and tempered alloy steel, without changing the material itself or adding subsequent finishing processes.

[0040] Specifically, the operation process of the machining device for the piston rod of the mold-moving cylinder is as follows: This device addresses the physical problem of flared or reduced diameter internal hexagonal holes caused by high-strength elastic aftereffects (elastic recovery can reach 0.02-0.05mm) in 42CrMo quenched and tempered alloy steel after cold spin extrusion. Therefore, it adopts a four-station combination of end face internal hexagonal hole forming, stress pre-control, lubrication maintenance and non-destructive testing to achieve high-precision machining of the internal hexagonal holes on the end face of the piston rod of the mold moving cylinder. First, the operator (or other automatic feeding equipment) places the pre-drilled piston rod at the end into the first receiving notch 101 on the right side of the three-slot plate 10. The transport component lifts it to the second receiving notch 101. Then, the pushing component (boss, cylinder two and end pressure plate) presses the piston rod head from the front end, so that the rear end of the piston rod abuts against the front end face of the partition plate 3. At the same time, the pressing component (frame, cylinder three and lower pressure plate) presses the rod body from above, realizing the positioning and locking of the piston rod. Subsequently, the hexagonal spun extrusion device 4 is started. Its spun extrusion head continuously feeds axially while rotating at high speed. It extends into the pre-drilled hole at the end of the piston rod through the first hole 31 and forms the basic outline of the internal hexagonal hole through the plastic flow of the metal through spun extrusion. It should be noted that the hexagonal swirl extrusion device 4 uses a combined motion of rotation and axial feed, rather than simple rotation. Second, after the above-mentioned rotary extrusion process is completed, the pushing component and the pressing component are released; The transport component is activated (the dual-head motor drives the connecting rod to swing, which in turn drives the lifting plate to make an arc lifting motion), lifting the piston rod placed in the receiving notch 101 and pushing it horizontally into the next receiving notch 101. This process is repeated to move the piston rod along the guide seat plate 2 to the left constraint expansion ring assembly 5 station and align it with the second hole 32. After it is in place, the pushing component and the pressing component of this station extend again to pre-clamp the piston rod (not completely locked, leaving room for correction micro-motion). Subsequently, the vision sensor 94 installed at the front end of the hollow extension rod 54 collects the angular deviation of the internal hexagonal hole in real time through the second hole 32 on the right side. The system transmits the deviation signal to the correction component 9. The built-in motor 92 in the parallel cylinder 91 drives the flexible contact shaft 93 to rotate. The two flexible contact shafts 93 rotating in the same direction drive the piston rod to rotate, so that the edge orientation of the internal hexagonal hole at the end is precisely aligned with the outer contour of the subsequently inserted contact plate 56. After the correction is completed, the pushing component and the pressing component are completely locked, and the piston rod is finally positioned. Third, the cylinder 511 located at the top of the positioning platform 51 extends and pushes the push plate 512 to slide along the left and right mounting cylinders 53. The push plate 512 pushes the hollow extension rod 54 on the right side forward, so that it passes through the second hole 32 on the right side of the partition plate 3 and extends precisely into the internal hexagonal hole at the end of the piston rod without contact (at this time, the contact plate 56 is in the retracted state, and there is no contact during the extension process). Subsequently, the air supply and exhaust assembly 6 is activated. The external high-pressure air source fills the front inner cavity of the hollow extension rod 54 with high-pressure gas through the air inlet pipe of the air inlet and exhaust pipe 63, the one-way valve 62, and the air inlet of the air inlet and exhaust interface 61 (the air pressure value is preset in the controller according to the workpiece specifications). The high-pressure gas drives the six circumferentially arranged outward sliding plates 55 to slide outward synchronously in the radial direction, which drives the contact plate 56 to rigidly support the six planar hole walls of the inner hexagonal hole. After being supported, it enters the pressure holding and pre-expansion stage, which causes the hole wall to produce a small amount of outward pre-expansion plastic deformation (the deformation amount is designed to be slightly greater than the subsequent elastic retraction amount). After the pressure holding is completed, the exhaust port is quickly depressurized through the one-way valve 62 and discharged through the exhaust pipe of the inlet and outlet pipe 63. At this time, a reverse tensile stress field has been established inside the metal of the hole wall. This stress field can precisely offset the axial compressive stress remaining in the hole wall after the extrusion process, and block the hole closing trend caused by the high-strength rebound of 42CrMo from the mechanical source. It should be noted that for 42CrMo material, the holding time follows the material characteristics: the controller automatically adjusts the holding time according to the workpiece specifications; for small, short piston rods, adjust to 0.3s; for conventional mold moving cylinder piston rods (42CrMo), 0.5s is preferred; and for large-diameter, thick-walled piston rods, adjust to 1.0s. It should also be noted that the internal hexagonal orifice after spin extrusion exhibits a deformation characteristic of six planes uniformly concave inwards. Since the metal flow at the hexagonal edge position is small and the constraint is strong, the springback is minimal and almost no shaping is required. Therefore, the contact plate 56 only needs to contact the middle area of ​​each plane and does not need to contact the edge, so as to reduce the tight contact area, reduce the required driving force and local stress concentration of the workpiece. Fourth, after depressurization, the contact plate 56 retracts inward and resets along with the outer moving plate 55; when the contact plate 56 retracts to the position of the lubrication assembly 7, the lubrication action is passively triggered: the metering oil valve 74 in the auxiliary cylinder 71 installed at the front end of the right-side mounting cylinder 53 opens, and the lubricating oil is metered into the inner ring guide pipe 72, and the oil flows to the wetting ring 73 (the wetting ring 73 is made of porous oil-containing polyurethane material); the surface of the retracted contact plate 56 is tightly scraped over the wetting ring 73 and is uniformly coated with a very thin continuous lubricating film; It should be noted that the function of the oil film is to lubricate the contact plate 56 when it is stretched outward and forms rigid contact with the inner hexagonal hole wall during the next pre-expansion operation. This reduces the frictional resistance of the contact surface, prevents scratches on the hole wall, and ensures that the tightening force is applied smoothly. Fifth, the transport component transports the piston rod to the leftmost receiving notch 101 again; at this time, cylinder 511 extends for the second time, pushing the push plate 512 to pass the detection rod 81 in the left mounting cylinder 53 through another second hole 32 on the left side of the partition plate and into the processed internal hexagonal hole; the detection probe 82 installed at the front end of the detection rod 81 contacts and scans the opposite side dimensions and taper of the hexagonal hole to determine whether the final hole quality of the internal hexagonal hole meets the standard; when the detection rod 81 retracts outward, the oil cleaning ring 83 sleeved at its front follows closely behind, and the oil cleaning ring 83, which is adapted to the size of the internal hexagonal hole, contacts and sucks out the lubricating oil remaining on the hole wall and carries it out; It should be noted that if the residual oil is not removed, the oil may adsorb the metal powder generated during processing, which may contaminate the hydraulic system during subsequent piston rod assembly. Furthermore, the residual oil film may affect the bonding force of the next process (such as end face welding or adhesive application). After the oil cleaning ring 83 is scraped off, a secondary degreasing treatment can be performed according to the process requirements to ensure the cleanliness of the workpiece. Sixth, after passing the inspection, the piston rod is transported by the transport component to the external collection roller conveyor to complete the entire processing.

[0041] As a further embodiment of the present invention, please refer to Figure 6 , Figure 7 and Figure 9The front end of the right-side mounting cylinder 53 is provided with an oil lubrication assembly 7, which includes an auxiliary cylinder 71, an inner ring guide pipe 72, an immersion ring 73, and a metering oil valve 74. The auxiliary cylinder 71 is threadedly installed at the front end of the right-side mounting cylinder 53. The inner ring guide pipe 72 is installed inside the auxiliary cylinder 71, and the immersion ring 73 is installed on the inner ring wall of the auxiliary cylinder 71. The metering oil valve 74 is installed at the top of the auxiliary cylinder 71 and is connected to the oil inlet at the top of the inner ring guide pipe 72. The oil outlet end of the inner ring guide pipe 72 extends into the immersion ring 73 to guide the lubricating oil to the immersion ring 73. The immersion ring 73 is used to coat the surface of the contact plate 56 with lubricating oil when it retracts.

[0042] Specifically, by setting up an auxiliary cylinder 71, an inner ring guide pipe 72, an immersion ring 73, and a metering oil valve 74, the auxiliary cylinder 71 and the mounting cylinder 53 are connected by a threaded connection to each other to achieve detachable installation. During operation, the metering oil valve 74 controls the supply of lubricating oil. The oil flows into the wetting ring 73 through the inner ring guide pipe 72 and is absorbed and stored by the porous material of the wetting ring 73. When the contact plate 56 retracts after completing the pressure holding, its surface contacts the wetting ring 73 and slides relative to it, thereby uniformly coating a layer of lubricating oil film on the surface of the contact plate 56. The above structure achieves quantitative and uniform lubrication of the working surface of the contact plate 56, solves the problem of poor surface lubrication consistency during repeated operations of the contact plate 56, avoids the inconvenience and unevenness of manual oiling, and ensures that the surface lubrication state of the contact plate 56 is consistent before each tightening operation, thereby maintaining the stability of the tightening force transmission.

[0043] As a further embodiment of the present invention, please refer to Figures 5-7 The air supply and exhaust assembly 6 includes: an air inlet and an exhaust outlet 61, which are respectively opened on the left and right sides of the rear end of the hollow extension rod 54; a one-way valve 62, which are respectively installed at the air inlet and exhaust outlet of the air supply and exhaust assembly 61; an air supply and exhaust pipe 63, which includes an air inlet pipe and an exhaust pipe, one end of which is connected to the corresponding one-way valve 62; and a hollow groove 64, which is opened on the double-arm support frame 52 and the right-side mounting cylinder 53, for the air supply and exhaust pipe 63 to pass through.

[0044] Specifically, this is achieved by setting up an intake / exhaust port 61, a one-way valve 62, an intake / exhaust pipe 63, and a perforated groove 64. During operation, external high-pressure gas enters the front inner cavity of the hollow extension rod 54 through the air inlet pipe and the one-way valve 62 at the air inlet, driving the outer moving plate 55 to expand outward; after the pressure holding is completed, the gas is discharged through the one-way valve 62 at the exhaust port and the exhaust pipe, realizing rapid pressure relief. The intake and exhaust pipes 63 introduce the air path from the outside into the hollow extension rod 54; the hollow slots 64 are opened on the double-arm support frame 52 and the right-side mounting cylinder 53, providing a bypass passage for the intake and exhaust pipes 63, which is convenient for connecting to the external air source and the external air release source. At the same time, the intake and exhaust pipes 63 are flexible pipes that can be bent and deformed during the sliding of the push plate 512 and the extension and retraction of the hollow extension rod 54 without affecting its extension. The above structure realizes independent control and orderly switching of air supply and exhaust, solves the problem of gas crossflow when switching air paths, and ensures the opening and retraction of the outer moving plate 55.

[0045] As a further embodiment of the present invention, please refer to Figure 10 The left mounting cylinder 53 is equipped with a detection component 8, which includes: a detection rod 81, which is slidably installed in the left mounting cylinder 53; a detection probe 82, which is installed at the front end of the detection rod 81 and is used to detect the state of the hole wall of the internal hexagonal hole; and an oil cleaning ring 83, which is sleeved on the front part of the detection rod 81.

[0046] Specifically, by setting up a detection rod 81, a detection probe 82, and an oil cleaning ring 83, during operation, cylinder 511 pushes push plate 512 to push the detection rod 81 forward, so that the detection probe 82 extends into the internal hexagonal hole, scans the opposite side dimensions and taper against the hole wall, and obtains the hole wall status data; after the detection is completed, the detection rod 81 retracts and exits, and the oil cleaning ring 83 moves backward. During the exit process, it absorbs and carries away the lubricating oil remaining on the hole wall (the oil cleaning ring 83 is made of porous oil-absorbing material). The above structure realizes the simultaneous operation of detecting the internal hexagonal hole forming quality and removing residual oil, solving the problem that residual oil in the hole after detection may adsorb metal powder, contaminate the subsequent hydraulic system, and affect the bonding force of subsequent processes. It eliminates the need to set up a separate oil cleaning process, and the oil cleaning ring 83 can be replaced periodically.

[0047] As a further embodiment of the present invention, please refer to Figure 5 and Figure 6 A cylinder 511 is installed at the rear end of the positioning stage 51. A push plate 512 is installed at the telescopic end of the cylinder 511. The push plate 512 is slidably installed inside the left and right side mounting cylinders 53. Hollow extension rods 54 and detection extension rods 81 are installed on the left and right sides of the push plate 512.

[0048] Specifically, by setting up cylinder 511 and push plate 512, hollow extension rod 54 and detection extension rod 81 are respectively installed on the left and right sides of push plate 512, so that hollow extension rod 54 and detection extension rod 81 share the same drive source; During operation, cylinder 511 extends, pushing push plate 512 to slide forward synchronously along the left and right mounting cylinders 53. Push plate 512 simultaneously drives the hollow extension rod 54 on the right and the detection extension rod 81 on the left to push forward synchronously, entering their respective second holes 32. When cylinder 511 retracts, the two extension rods retract synchronously to reset. The above structure realizes the linkage drive of hollow extension rod 54 and detection extension rod 81. One cylinder 511 completes the forward and backward movements of the two extension rods at the same time, ensuring the consistency of the extension rod movements during pre-expansion and detection operations.

[0049] As a further embodiment of the present invention, please refer to Figure 4 The partition plate 3 has a first hole 31 on the right side of the front part and two parallel second holes 32 on the left side of the front part; the two second holes 32 are respectively coaxially arranged with the corresponding mounting cylinder 53.

[0050] Specifically, by setting a partition plate 3 as a front positioning barrier, a first hole 31 is opened on the right side of its front part, and two parallel second holes 32 are opened on the left side of its front part, integrating the swirl extrusion channel with the pre-expansion and detection channel on the same partition plate 3. During operation, the hexagonal extrusion device 4's extrusion head extends into the pre-drilled hole at the end of the piston rod through the first hole 31 on the right side to perform extrusion molding; the hollow extension rod 54 and the detection extension rod 81 extend into the inner hexagonal hole through the two second holes 32 on the left side to perform pre-expansion and detection operations; the two second holes 32 are coaxially set with the corresponding side's fitting cylinder 53 to ensure that the extension rods move in and out in a straight line and avoid deflection; The above structure enables the three functional components of rotary extrusion, pre-expansion and detection to be arranged in separate areas on the partition plate 3, so that each extension rod has its own independent entry and exit channel, which solves the channel interference problem when multiple components are arranged in a concentrated manner. At the same time, the coaxiality of each hole position with the corresponding component ensures the straightness of the extension rod's entry and exit.

[0051] As a further embodiment of the present invention, please refer to Figure 11 A correction component 9 is provided on the lower front side of the second hole position 32 on the right. The correction component 9 includes: two parallel cylinders 91, which are installed at the front end of the partition plate 3 and symmetrically arranged on the left and right sides of the lower part of the second hole position 32 on the right; a built-in motor 92, which is installed inside the parallel cylinder 91; a flexible contact shaft 93, which is rotatably installed at the front end of the parallel cylinder 91; and a vision sensor 94, which is installed at the front end of the hollow extension rod 54.

[0052] Specifically, by setting up a parallel cylinder 91, a built-in motor 92, a flexible contact shaft 93, and a vision sensor 94, during operation, the vision sensor 94 collects the edge orientation information of the internal hexagonal hole. The system controls the built-in motor 92 to drive the flexible contact shaft 93 to rotate according to the collected deviation signal. The two symmetrically arranged flexible contact shafts 93 rotate in the same direction, driving the piston rod to rotate through frictional contact until the edge orientation of the internal hexagonal hole is aligned with the outer contour of the subsequently inserted contact plate 56. The above structure realizes the automatic identification and correction of the orientation deviation of the internal hexagonal hole, solves the problem of uncertain orientation of the edge of the internal hexagonal hole when the piston rod is moved by the transport component for secondary positioning, ensures that the contact plate 56 is accurately aligned with the hole when it is inserted, and avoids interference or collision between the contact plate 56 and the edge due to orientation deviation.

[0053] As a further embodiment of the present invention, please refer to Figures 1-3 A three-spacing plate 10 is installed in the front middle of the guide plate 2. The three-spacing plate 10 has equidistant receiving notches 101. The three-spacing plate 10 is equipped with a transport component for lifting the piston rod. The transport component uses a double-headed motor, connecting rod and lifting plate to lift the piston rod placed in the receiving notch 101 and move it to the next receiving notch 101.

[0054] Specifically, by setting three-plate spacing 10 and opening receiving notches 101 at equal intervals on them, a unified positioning reference is provided for the stopping position of the piston rod between each work station. During operation, the transport components (dual-head motor, connecting rod and lifting plate) drive the connecting rod to swing through the dual-head motor, causing the lifting plate to make an arc lifting motion, lifting the piston rod placed in the receiving notch 101 away from the plate and pushing it horizontally into the next receiving notch 101. This process is repeated to realize the step-by-step transfer of the piston rod between each work station.

[0055] As a further embodiment of the present invention, please refer to Figures 1-3 The guide plate 2 has a push component at the front of its top end. The push component is made up of a boss, a cylinder, and an end pressure plate. It is used to push and lock the front end of the piston rod in the receiving notch 101. The partition plate 3 has a pressing component on the left and right sides of its front end. The pressing component is made up of a frame, a cylinder, and a pressing plate. It is used to press the piston rod located in the receiving notch 101.

[0056] Specifically, by setting the push component (boss, cylinder two, end pressure plate) at the front of the top of the guide seat plate 2, and setting the press component (frame, cylinder three, press plate) on the left and right sides of the front end of the partition plate 3, the piston rod is simultaneously subjected to the front axial thrust and the upper radial pressure in the receiving notch 101. During operation, cylinder two pushes the end pressure plate to press the piston rod head from the front end, so that the rear end of the piston rod abuts against the front end face of the partition plate 3 to achieve axial limitation; at the same time, cylinder three pushes the lower pressure plate to press the rod body from above to prevent the piston rod from jumping or deflecting in the receiving notch 101. At the same time, the pushing component and the pressing component work together to achieve multi-directional limiting of the piston rod on the basis of the V-shaped support of the notch 101, so that it maintains a stable spatial position during the extrusion, pre-expansion and inspection operations, and reduces the processing deviation caused by the movement of the workpiece under force.

[0057] Example 2, please refer to Figures 1-11 This embodiment also provides a method for using a machining device for a mold-moving cylinder piston rod, including the following steps: S1. The transport component transports the piston rod with the end hole punched to the hexagonal spin extrusion device 4 station. The pushing component and the pressing component cooperate to position and lock the piston rod. The hexagonal spin extrusion device 4 performs spin extrusion forming of the internal hexagonal hole on the end of the piston rod. S2. The top pusher and bottom presser at the hexagonal swirl extrusion device 4 are released, and the transport component transports the piston rod to the constraint expansion ring assembly 5 station and is once again positioned and locked by the top pusher and bottom presser at its position. S3. The visual sensor 94 on the hollow extension rod 54 collects the position information of the internal hexagonal hole, and the correction component 9 corrects the position of the piston rod end so that the internal hexagonal hole is aligned with the contact plate 56. S4. The cylinder 511 drives the push plate 512 to push the hollow extension rod 54 through the second hole 32 and into the internal hexagonal hole. The air supply and exhaust assembly 6 drives the outer moving plate 55 to drive the contact plate 56 to stretch the internal hexagonal hole wall outward, so that the hole wall produces outward pre-expansion deformation and establishes a reverse stress field in the hole wall to counteract the axial compressive stress remaining in the hole wall after spin extrusion, thereby preventing the hole opening from shrinking and deforming. S5. After the contact plate 56 completes the pre-expansion and pressure holding, it retracts and resets. The lubrication component 7 evenly coats the supporting working surface of the contact plate 56 with lubricating oil to form a continuous lubricating film, which is used to reduce the contact friction between the contact plate 56 and the inner hexagonal hole wall during subsequent insertion operations. S6. The transport component transports the piston rod to the next station. The detection rod 81 extends into the internal hexagonal hole. The detection probe 82 detects the condition of the hole wall. The oil cleaning ring 83 scrapes off the residual oil when the detection rod 81 retracts. After the detection is completed, the oil is transported to the outside for collection.

[0058] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A processing device for a moving mold cylinder piston rod, comprising a worktable (1) and guide plates (2) installed on the left and right sides of the top of the worktable (1), wherein a partition plate (3) is installed at the rear of the top of the guide plate (2); characterized in that: The guide plate (2) on the right side is provided with a hexagonal extrusion device (4) at the rear top of the top, and the guide plate (2) on the left side is provided with a constraint expansion ring assembly (5) at the rear top of the top, and the constraint expansion ring assembly (5) is provided with an air supply and exhaust assembly (6). The constraint expansion coil component (5) includes: A positioning platform (51) is installed at the rear top of the guide plate (2). A double-arm support frame (52) is installed at the front top of the positioning platform (51). A fitting cylinder (53) is installed on both the left and right sides of the top of the double-arm support frame (52). A hollow extension rod (54) is provided inside the fitting cylinder (53) on the right side. Six outward sliding plates (55) are circumferentially sliding on the inner wall of the front part of the hollow extension rod (54). A contact plate (56) is installed on the outward side of each outward sliding plate (55). When the hollow extension rod (54) is inserted into the internal hexagonal hole at the end of the piston rod, the air supply and exhaust assembly (6) drives the outer moving plate (55) to move the contact plate (56) to stretch the hole wall of the internal hexagonal hole outward, causing it to produce an outward pre-expansion deformation.

2. The machining device for a mold-moving cylinder piston rod as described in claim 1, characterized in that, The front end of the right-side loading cylinder (53) is provided with an oil lubrication assembly (7), which includes an auxiliary cylinder (71), an inner ring guide pipe (72), an immersion ring (73), and a metering oil valve (74). The auxiliary cylinder (71) is threadedly installed at the front end of the mounting cylinder (53) on the right side; The auxiliary cylinder (71) is equipped with an inner ring guide pipe (72), and an immersion ring (73) is installed on the inner ring wall of the auxiliary cylinder (71). The metering valve (74) is installed on the top of the auxiliary cylinder (71) and is connected to the oil inlet at the top of the inner ring guide pipe (72); The oil outlet end of the inner ring guide tube (72) extends into the immersion ring (73) to guide the lubricating oil to the immersion ring (73), which is used to coat the surface of the contact plate (56) with lubricating oil when the contact plate (56) retracts.

3. The machining device for a mold-moving cylinder piston rod as described in claim 1, characterized in that, The air supply and exhaust assembly (6) includes: The intake and exhaust ports (61) include an intake port and an exhaust port, which are respectively opened on the left and right sides of the rear end of the hollow extension rod (54); One-way valves (62) are installed at the air inlet and air outlet of the air inlet and air outlet ports (61), respectively; The intake and exhaust pipes (63) include an intake pipe and an exhaust pipe, one end of which is connected to the corresponding one-way valve (62); A perforated groove (64) is provided on the double-arm support frame (52) and the right-side mounting cylinder (53) for the intake and exhaust pipes (63) to pass through.

4. The machining device for a mold-moving cylinder piston rod as described in claim 1, characterized in that, The left-side loading cylinder (53) is equipped with a detection component (8), which includes: The detection rod (81) is slidably installed inside the mounting cylinder (53) on the left side; The detection probe (82) is installed at the front end of the detection extension rod (81) and is used to detect the state of the hole wall of the internal hexagonal hole; The oil cleaning ring (83) is sleeved on the front part of the detection rod (81).

5. The machining device for a mold-moving cylinder piston rod as described in claim 4, characterized in that, A cylinder (511) is installed at the rear end of the positioning platform (51), and a push plate (512) is installed at the telescopic end of the cylinder (511). The push plate (512) is slidably installed inside the fitting cylinder (53) on the left and right sides. Hollow extension rods (54) and detection extension rods (81) are installed on the left and right sides of the push plate (512).

6. The machining device for a mold-moving cylinder piston rod as described in claim 1, characterized in that, The partition plate (3) has a first hole (31) on the right side of the front part and two parallel second holes (32) on the left side of the front part. The two second holes (32) are respectively coaxially arranged with the fitting cylinder (53) on the corresponding side.

7. The machining device for a mold-moving cylinder piston rod as described in claim 6, characterized in that, A correction component (9) is provided on the lower front side of the second hole (32) on the right side. The correction component (9) includes: Two parallel cylinders (91) are provided and installed at the front end of the partition plate (3) and symmetrically arranged on the left and right sides below the second hole (32) on the right. An internal motor (92) is installed inside the parallel cylinder (91); A flexible contact shaft (93) is rotatably mounted on the front end of the parallel cylinder (91); A vision sensor (94) is installed at the front end of the hollow extension rod (54).

8. The machining device for a mold-moving cylinder piston rod as described in claim 1, characterized in that, The guide plate (2) is equipped with a three-slotted plate (10) at the front center. The three-slotted plate (10) is provided with receiving notches (101) at equal intervals. The three-slotted plate (10) is provided with a transport component for lifting the piston rod. The transport component uses a dual-head motor, connecting rod and lifting plate to lift the piston rod placed in the receiving notch (101) and move it to the next receiving notch (101).

9. The machining device for a mold-moving cylinder piston rod as described in claim 8, characterized in that, The guide plate (2) is provided with a pusher component at the front of the top end. The pusher component is made of a boss, a cylinder, and an end pressure plate, and is used to push and lock the front end of the piston rod in the receiving notch (101). The front end of the partition plate (3) is provided with pressing components on the left and right sides. The pressing components are made of a frame, a cylinder, and a pressing plate, and are used to press the piston rod located in the receiving notch (101).

10. A method of using a machining device for a mold-moving cylinder piston rod, characterized in that, The machining apparatus for a mold-moving cylinder piston rod according to any one of claims 1-9 includes the following steps: S1. The transport component transports the piston rod with the end hole punched to the hexagonal extrusion device (4) station. The push component and the press component cooperate to position and lock the piston rod. The hexagonal extrusion device (4) performs hexagonal extrusion forming on the end of the piston rod. S2, the pusher and presser at the hexagonal extrusion device (4) are released, and the transporter transports the piston rod to the constrained expansion ring assembly (5) station and is once again positioned and locked by the pusher and presser at its position; S3. The visual sensor (94) on the hollow extension rod (54) collects the position information of the internal hexagonal hole, and the correction component (9) corrects the position of the piston rod end so that the internal hexagonal hole is aligned with the contact plate (56). S4. The cylinder (511) drives the push plate (512) to push the hollow extension rod (54) through the second hole (32) and into the inner hexagonal hole. The air supply and exhaust assembly (6) drives the outer moving plate (55) to drive the contact plate (56) to stretch the inner hexagonal hole wall outward, so that the hole wall produces outward pre-expansion deformation and establishes a reverse stress field in the hole wall to offset the axial compressive stress remaining in the hole wall after spin extrusion, thereby preventing the hole opening from shrinking and deforming. S5. After the contact plate (56) completes the pre-expansion and pressure holding, it retracts and resets. The lubrication assembly (7) evenly coats the supporting working surface of the contact plate (56) with lubricating oil to form a continuous lubricating film, which is used to reduce the contact friction between the contact plate (56) and the inner hexagonal hole wall during subsequent insertion operations. S6. The transport component transports the piston rod to the next station. The detection rod (81) extends into the internal hexagonal hole. The detection probe (82) detects the condition of the hole wall. The oil cleaning ring (83) scrapes off the residual oil when the detection rod (81) retracts. After the detection is completed, the oil is transported to the outside for collection.

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