A piston riser milling device and method

Abstract

This invention provides a piston riser milling apparatus and method. The apparatus includes: a machine bed; a loading and unloading mechanism mounted on one side of the machine bed; a front and rear conveying mechanism mounted on the machine bed, the loading and unloading mechanism conveying the piston blank to a piston blank fixing fixture below the front and rear conveying mechanism; a left-moving milling mechanism and a right-moving milling mechanism, mounted on the machine bed and respectively located on the left and right sides of the front and rear conveying mechanism; a left-chamfering mechanism and a right-chamfering mechanism, mounted on the machine bed and respectively located on the left and right sides of the front and rear conveying mechanism; and a top riser milling mechanism, mounted on the machine bed and located at the front end of the front and rear conveying mechanism. Through the technical solution of this invention, after a single positioning and clamping, all risers of large marine engine pistons can be milled in one operation, resulting in high production efficiency. It can remove the head and skirt connecting risers, shorten the processing time of subsequent processes, and improve the overall processing efficiency of the piston.

Description

Technical Field

[0001] This invention relates to the field of piston manufacturing equipment technology, and more specifically, to a piston riser milling device and method. Background Technology

[0002] Piston risers are supplementary structures added to the top and sides of the piston to prevent quality defects during the piston casting process. They are used for slag collection and venting, observing the aluminum molten metal filling, compensating for shrinkage during blank solidification, adjusting the temperature distribution during blank solidification, and controlling the solidification sequence. In related technologies, milling equipment processes pistons of the following types: Figure 1 The small, two-chamber piston shown has a top riser 102 and a middle riser 104. Larger pistons used in marine engines, however, have a single piston riser, such as... Figure 2 As shown, the top riser 202 and the two side risers are side riser one 204 and side riser two 206, respectively. Existing milling equipment suitable for small pistons with two cavities in a mold is difficult to automate the machining of single piston risers for large marine engine pistons, which have curved surface connecting risers on both sides. Single piston risers for large marine engine pistons are generally removed using band saws, drilling machines, or milling equipment combining robots and large milling cutters. The following technical defects exist:

[0003] (1) Band saw processing involves mounting the blank on a special band saw and using the spindle head to drive the saw blade to saw the top and side risers respectively. The processing efficiency is low, and it can only process one side. Each riser needs to complete the sawing process in one go. The band saw wear is high, the labor intensity of workers is high, the equipment cycle time is long, and the placement position of the piston blank needs to be adjusted manually multiple times.

[0004] (2) The drilling machine is used to process the risers by drilling holes to separate them locally, and then manually knocking them off. The processing efficiency is low, and it can only process one side. Each riser needs to be processed in sequence, and multiple position adjustments are required. The labor intensity of workers is high and the equipment cycle time is long.

[0005] (3) The milling equipment that combines a robot and a large disc cutter clamps the piston and moves it to the large disc cutter, and then gradually mills the top and side risers of the piston. The production efficiency is low, the equipment cycle time is long, the equipment is not compact, and the piston blank position needs to be adjusted multiple times. Summary of the Invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0007] Therefore, one objective of the present invention is to provide a piston riser milling device and method, which can perform one-time milling of each riser of a large piston for marine machinery after a single positioning and clamping, resulting in high production efficiency. It can also remove the head and skirt connecting risers, greatly shortening the processing time of subsequent processes and improving the overall processing efficiency of the piston. Moreover, it has high positioning accuracy and can more uniformly unify the height of the remaining risers.

[0008] To achieve the above objectives, the present invention provides a piston riser milling device, comprising: a bed; a loading and unloading mechanism installed on one side of the bed; a front and rear conveying mechanism installed on the bed, one end of the front and rear conveying mechanism being adjacent to the loading and unloading mechanism, the loading and unloading mechanism conveying the piston blank to below the piston blank fixing fixture of the front and rear conveying mechanism; a left-moving milling mechanism and a right-moving milling mechanism, which are configured to cooperate, installed on the bed and respectively located on the left and right sides of the front and rear conveying mechanism; a left chamfering mechanism and a right chamfering mechanism, which are configured to cooperate, installed on the bed and respectively located on the left and right sides of the front and rear conveying mechanism, wherein along the forward direction of the front and rear conveying mechanism, the piston blank first passes below the left-moving milling mechanism and the right-moving milling mechanism, and then passes below the left chamfering mechanism and the right chamfering mechanism; and a top riser milling mechanism installed on the bed and located at the front end of the front and rear conveying mechanism.

[0009] Preferably, the left chamfering mechanism and the right chamfering mechanism each include: a mechanism support mounted on the bed, with an adjusting rod on the mechanism support; a first slide, mounted on the mechanism support and slidably connected to the mechanism support, with the bottom of the first slide connected to the adjusting rod to adjust the relative position of the first slide on the mechanism support; a vertical guide rail mounted on the first slide via a vertical guide rail bracket; a second slide, slidably connected to the vertical guide rail; a downward hydraulic cylinder, fixedly mounted on the top of the vertical guide rail bracket, with the movable end of the downward hydraulic cylinder slidably connected to the second slide via a downward hydraulic cylinder connecting plate to push the second slide to slide up and down; and an angle grinder mounted on the downward hydraulic cylinder connecting plate via an angle grinder mounting bracket, with a small circular saw blade mounted on the angle grinder, the small circular saw blade being inclined.

[0010] Preferably, the angle grinder mounting bracket has multiple annularly distributed elongated groove-shaped angle grinder mounting holes to rotate and adjust the fixed position of the angle grinder, and adjust the position and tilt angle of the small circular saw blade.

[0011] Preferably, the left chamfering mechanism and the right chamfering mechanism further include: a first proximity switch, which is fixedly mounted on the vertical guide rail bracket via a switch mounting plate and is arranged adjacent to the vertical guide rail; and a limiting screw, which is mounted on the vertical guide rail bracket via a screw support and is located at the bottom of the vertical guide rail.

[0012] Preferably, the loading and unloading mechanism includes: a loading and unloading mechanism mounting plate, fixedly mounted on one side of the bed, with longitudinal guide rails on both sides; a loading and unloading cylinder, fixedly mounted on the bottom of the loading and unloading mechanism mounting plate; a supporting side plate and a supporting top plate connected in cooperation, the piston rod of the loading and unloading cylinder being fixedly connected to the supporting side plate through a cylinder connector, the supporting side plate being slidably connected to the longitudinal guide rails on the loading and unloading mechanism mounting plate; a piston blank loading and unloading plate, disposed on the supporting top plate and slidably connected to the supporting top plate, with a first piston blank placement fixture disposed on the piston blank loading and unloading plate; and a hydraulic motor, fixedly mounted below the supporting top plate, with its drive shaft passing through the supporting top plate and connected to the piston blank loading and unloading plate. The piston blank loading and unloading plates are connected by gears and racks to drive the piston blank to slide and translate. A first limit switch and a second limit switch are arranged vertically at intervals on the support side plate. A first stop block and a second stop block are arranged vertically at intervals on the loading and unloading mechanism mounting plate. The first limit switch and the second limit switch are respectively configured to cooperate with the first stop block and the second stop block to limit the rise and fall of the support top plate. A third limit switch and a fourth limit switch are arranged horizontally at intervals on the support top plate. A third stop block and a fourth stop block are arranged horizontally at intervals on the piston blank loading and unloading plates. The third limit switch and the fourth limit switch are respectively configured to cooperate with the third stop block and the fourth stop block to limit the left and right movement of the piston blank loading and unloading plates.

[0013] Preferably, the front and rear conveying mechanism includes: a front and rear conveying mechanism mounting support, fixedly mounted on the bed, with a first guide rail on the mounting support; a third slide, slidably connected to the first guide rail, with a second piston blank placement fixture on the third slide; a first servo motor, mounted on one side of the front and rear conveying mechanism mounting support and connected to the third slide to drive the third slide to move back and forth along the first guide rail; a plurality of fifth limit switches, fixedly mounted on the front and rear conveying mechanism mounting support and located outside the first guide rail, with a stop block matching the fifth limit switch on the side of the third slide; a cylinder bracket, fixedly mounted on the third slide; a clamping cylinder, fixedly mounted on the cylinder bracket, with a piston blank fixing fixture connected below the clamping cylinder, a guide rod connected to the top surface of the piston blank fixing fixture, the guide rod passing through the cylinder bracket and pointing upwards, the piston blank fixing fixture cooperating with the second piston blank placement fixture; and a second proximity switch, fixedly mounted on the top of the cylinder bracket via a proximity switch bracket and cooperating with the guide rod.

[0014] Preferably, the left-moving milling mechanism and the right-moving milling mechanism each include: a milling mechanism mounting support, fixedly mounted on the machine bed, the milling mechanism mounting support being provided with a slide adjustment screw; a fourth slide, disposed on the milling mechanism mounting support and slidably connected to the milling mechanism mounting support, the bottom of the fourth slide being connected to the slide adjustment screw to adjust the relative position of the fourth slide on the milling mechanism mounting support; and a power head slide, mounted on the fourth slide, the end of the power head slide being fixedly mounted with a second servo motor via a motor mounting support. A second guide rail is provided on the upper part; a fifth slide is provided on the power head slide and is slidably connected to the second guide rail, and a second servo motor is connected to the fifth slide to drive the fifth slide to move along the second guide rail; a first milling machine is fixedly installed on the fifth slide, and the first milling machine includes a first spindle head facing the front and rear conveying mechanism, a first tool holder connecting plate installed on the first spindle head, and a first milling cutter installed on the first tool holder connecting plate. The first milling cutter includes a first tool holder installed on the first tool holder connecting plate, a first shock absorber plate sleeved and installed on the first tool holder, and a first circular saw blade.

[0015] Preferably, the top-mount milling mechanism includes: a top-mount milling mechanism support, fixedly mounted on the machine bed and located at the front end of the front and rear conveying mechanisms, with a third guide rail provided on the top-mount milling mechanism support; a sixth slide, mounted on the top-mount milling mechanism support and slidably connected to the third guide rail, with a third servo motor mounted at the end of the top-mount milling mechanism support, the third servo motor being connected to the sixth slide to drive the sixth slide to move along the third guide rail; and a second milling machine, fixedly mounted on the sixth slide, the second milling machine including a second spindle head facing the end of the front and rear conveying mechanisms, a second tool holder connecting plate mounted on the second spindle head, and a second milling cutter mounted on the second tool holder connecting plate, the second milling cutter including a second tool holder mounted on the second tool holder connecting plate, a second shock absorber plate sleeved on the second tool holder, and a second circular saw blade.

[0016] Preferably, the first milling cutter and the second milling cutter are equipped with self-lubricating devices, and a lubrication distributor is provided on the mounting support of the front and rear conveying mechanisms, with the lubrication distributor connected to the self-lubricating device via pipeline.

[0017] The present invention also provides a piston riser milling method, which uses the piston riser milling device described above and includes the following steps:

[0018] The robotic arm places the piston blank at the first piston blank placement fixture of the loading and unloading mechanism. The upper and lower cylinders are controlled to lift the piston blank loading and unloading plates through the support top plate. When the first limit switch reaches the first impact block and sends a positioning signal, the upper and lower cylinders are controlled to stop. The hydraulic motor is started, which drives the piston blank loading and unloading plates to slide, thereby moving the piston blank to the second piston blank placement fixture of the front and rear conveying mechanism. When the third impact block reaches the third limit switch and sends a positioning signal, the hydraulic motor is controlled to stop. The upper and lower cylinders are driven to lower the piston blank loading and unloading plates through the support top plate. When the second limit switch reaches the second impact block and sends a positioning signal, the upper and lower cylinders are controlled to stop. The hydraulic motor is started, which drives the piston blank loading and unloading plates to slide back until the fourth impact block reaches the fourth limit switch and sends a positioning signal.

[0019] The clamping cylinder is lowered, and the piston blank fixing fixture and the second piston blank placement fixture cooperate to press the piston blank together.

[0020] The first servo motor in the front and rear conveying mechanism drives the third slide and the piston blank forward 300mm. During this process, the left moving milling mechanism and the right moving milling mechanism respectively perform preliminary milling on the blank head and the connecting risers on both sides of the skirt of the piston blank.

[0021] The first servo motor in the front and rear conveying mechanism drives the third slide and piston blank to continue moving forward 600mm. At the same time, the third servo motor in the top riser milling mechanism drives the sixth slide to move. The second milling machine on the sixth slide mills the top riser and then resets.

[0022] The first servo motor in the front and rear conveying mechanism drives the third slide and piston blank to move backward 200mm. The downward hydraulic cylinders in the left and right chamfering mechanisms move downward, driving the small circular saw blade on the angle grinder to mill the chamfering of the blank head and the two sides of the skirt. After completion, it is reset.

[0023] The first milling machine in the left and right moving milling mechanisms is controlled to advance 10mm, and the first servo motor in the front and rear conveying mechanisms is controlled to drive the third slide and piston blank to continue to retreat 150mm, so as to perform secondary milling on the residual riser of the blank skirt.

[0024] The first servo motor in the front and rear conveying mechanisms drives the third slide and piston blank to continue moving forward 250mm, while the first milling machine in the left and right moving milling mechanisms moves backward 50mm.

[0025] The first servo motor in the front and rear conveying mechanism drives the third slide and piston blank to retreat 800mm to the initial position. The loading and unloading mechanism is controlled to complete the unloading. The robot arm takes away the piston blank after the riser is removed from the loading and unloading mechanism.

[0026] The piston riser milling device and method proposed in this invention have the following beneficial technical effects:

[0027] (1) The piston riser milling device proposed in this invention is compact and low in cost. After one positioning and clamping, it can perform one-time milling of each riser of a large piston of a ship engine. The equipment cycle time is short and the production efficiency is high.

[0028] (2) The piston riser milling device proposed in this invention has a unique left chamfering mechanism and a right chamfering mechanism, which can remove the head and skirt connecting risers, greatly shorten the processing time of subsequent processes, stabilize the product quality in the piston processing process, and improve the overall processing efficiency of the piston. Moreover, the tilt angle and position of the small circular saw blades in the left chamfering mechanism and the right chamfering mechanism are adjustable and the adjustment is convenient and reliable, and can mill various types of chamfered risers.

[0029] (3) The piston riser milling device proposed in this invention adopts a structure of servo motor and guide rail screw for position adjustment, which greatly improves the positioning accuracy and unifies the remaining riser height to a greater extent, thereby making it easier to realize subsequent processing steps and avoiding product quality problems caused by inconsistent riser height to a certain extent.

[0030] (4) The piston riser milling device proposed in this invention adopts an original loading and unloading mechanism. The loading and unloading mechanism occupies less space, which improves the overall compactness of the device. Moreover, loading and unloading can be achieved from the same loading and unloading mechanism. The loading and unloading mechanism can send the piston blank to the placement fixture of the front and rear conveying mechanism. The fixed fixture positions the top of the piston blank and the pin hole, realizing one-time clamping and positioning, which further improves the work efficiency and avoids the occurrence of clamping misalignment during secondary clamping.

[0031] (5) The piston riser milling device proposed in this invention has a left moving milling mechanism, a right moving milling mechanism, a top riser milling mechanism, a left chamfering mechanism, and a right chamfering mechanism. Each mechanism is designed with a slide table, etc., which enables the piston blank to be clamped and positioned on the front and rear conveying mechanisms at one time. Then, it can perform milling on multiple parts such as the blank head, the riser connecting both sides of the skirt, the chamfer connecting both sides of the blank head and skirt, and the top riser. It is more efficient and more accurate.

[0032] (6) The piston riser milling method proposed in this invention enables the one-time milling of each riser of a large piston of marine machinery after the piston blank is positioned and clamped once. The equipment cycle time is short and the production efficiency is high. Moreover, the forward and backward strokes of the piston blank are reasonably designed, which saves time while ensuring milling. At the same time, the residual riser on the skirt of the blank can be milled again during the backward process, which has higher accuracy and reliability.

[0033] Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description or may be learned by practice of the invention. Attached Figure Description

[0034] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0035] Figure 1 A schematic diagram of a small piston riser with two cavities in one mold is shown.

[0036] Figure 2 A schematic diagram of a single riser for a large piston in a marine engine is shown.

[0037] Figure 3 A schematic diagram of a piston riser milling apparatus according to an embodiment of the present invention is shown;

[0038] Figure 4 This diagram illustrates the structure of the left chamfering mechanism and the right chamfering mechanism in a piston riser milling device according to an embodiment of the present invention.

[0039] Figure 5 It shows Figure 4 Schematic diagram of the angle grinder mounting position in the left and right chamfering mechanisms;

[0040] Figure 6 A schematic diagram of the loading and unloading mechanism in a piston riser milling device according to an embodiment of the present invention is shown;

[0041] Figure 7 It shows Figure 6 Side view of the loading and unloading mechanism;

[0042] Figure 8 A schematic diagram of the front and rear conveying mechanisms in a piston riser milling apparatus according to an embodiment of the present invention is shown;

[0043] Figure 9 A schematic diagram of the structure of the left-moving milling mechanism and the right-moving milling mechanism in a piston riser milling device according to an embodiment of the present invention is shown.

[0044] Figure 10 This diagram illustrates the positional structure of the action process for removing the riser from a large piston in a marine engine, according to an embodiment of the present invention.

[0045] in, Figures 1 to 10 The correspondence between the reference numerals and components in the attached drawings is as follows:

[0046] 102 Top riser, 104 Intermediate riser, 202 Top side riser, 204 Side riser one, 206 Side riser two, 208 Head and skirt chamfer, 210 Blank skirt, 212 Blank head.

[0047] 302 Bed, 304 Loading / unloading mechanism, 3041 Loading / unloading mechanism mounting plate, 3042 Longitudinal guide rail, 3043 Loading / unloading cylinder, 3044 Support side plate, 3045 Support top plate, 3046 Cylinder connector, 3047 Piston blank loading / unloading plate, 3048 First piston blank placement fixture, 3049 Hydraulic motor, 3050 Gear, 3051 Rack, 3052 First limit switch, 3053 Second limit switch, 3054 First stop block, 3055 Second stop block, 3056 Third limit switch, 3057 Fourth limit switch, 3058 Third stop block, 3059 Fourth stop block, 306 Front and rear conveying mechanism, 3061 Front and rear conveying mechanism mounting support, 3062 First guide rail, 3063 Third slide table, 3064 Second piston blank placement fixture, 3065 First servo motor, 3066 Fifth limit switch, 3067 cylinder bracket, 3068 clamping cylinder, 3069 piston blank fixing fixture, 3070 guide rod, 3071-1 second proximity switch one, 3071-2 second proximity switch two, 3072 proximity switch bracket, 308 left-moving milling mechanism, 3081 milling mechanism mounting bracket, 3082 slide table adjusting screw, 3083 fourth slide table, 3084 power head slide table, 3085 motor mounting bracket, 3086 second servo motor, 3087 second guide rail, 3088 fifth slide table, 3089 first milling machine, 3090 first spindle head, 3091 first tool holder connecting plate, 3092 first milling cutter, 3092-1 first tool holder, 3092-2 first shock absorber plate, 3092-3 first circular saw blade, 310 right-moving milling mechanism, 312 Left chamfering mechanism, 3121 Mechanism support, 3122 Adjusting rod, 3123 First slide, 3124 Vertical guide rail, 3125 Vertical guide rail bracket, 3126 Second slide, 3127 Downward cylinder, 3128 Downward cylinder connecting plate, 3129 Angle grinder, 3130 Angle grinder mounting bracket, 3131 Small circular saw blade, 3132 Long slotted angle grinder mounting hole, 3133 First proximity switch, 3134 Switch mounting plate, 3135 Limit screw, 3136 Screw support, 314 Right chamfering mechanism, 316 Top riser milling mechanism, 3161 Top riser milling mechanism support, 3162 Third guide rail, 3163 Sixth slide, 3164 Third servo motor, 3165 Second milling machine, 3166 Second spindle head, 3167 Second tool holder connecting plate, 3168 Second milling cutter, 3168-1 Second tool holder, 3168-2 Second shock absorber, 3168-3 Second circular saw blade, 318 Lubrication distributor. Detailed Implementation

[0048] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0049] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0050] The following is combined Figures 3 to 10 A piston riser milling apparatus and method according to an embodiment of the present invention will be described in detail.

[0051] like Figures 3 to 10As shown, a piston riser milling device according to an embodiment of the present invention includes: a bed 302, a loading / unloading mechanism 304, a front and rear conveying mechanism 306, a left-moving milling mechanism 308 and a right-moving milling mechanism 310, a left chamfering mechanism 312 and a right chamfering mechanism 314, and a top riser milling mechanism 316, etc. The loading / unloading mechanism 304 is installed on one side of the bed 302 and loads and unloads materials to the front and rear conveying mechanism 306. The front and rear conveying mechanism 306 is installed on the bed 302, and one end of the front and rear conveying mechanism 306 is arranged adjacent to the loading / unloading mechanism 304. The loading / unloading mechanism 304 conveys the blank to the piston blank fixing fixture 3069 of the front and rear conveying mechanism 306. The front and rear conveying mechanism 306 drives the piston blank to move back and forth. After one positioning and clamping, milling is performed on multiple parts such as the blank head 212, the risingers connecting both sides of the skirt, the chamfers connecting both sides of the blank head 212 and the skirt, and the top riser 202. Left-moving milling mechanism 308 and right-moving milling mechanism 310 are mounted on the bed 302 and are located on the left and right sides of the front and rear conveying mechanism 306, respectively. They cooperate with the front and rear conveying mechanism 306 to mill the blank head 212 and the connecting risers on both sides of the skirt. They are movable and can precisely control the height of the remaining risers. Left-chamfering mechanism 312 and right-chamfering mechanism 314 are mounted on the bed 302 and are located on the left and right sides of the front and rear conveying mechanism 306, respectively. Along the forward direction of the front and rear conveying mechanism 306, the piston blank first passes under the left-moving milling mechanism 308 and right-moving milling mechanism 310, and then under the left-chamfering mechanism 312 and right-chamfering mechanism 314. This enables the milling of the blank head 212 and the connecting chamfers on both sides of the skirt, which helps to shorten the processing time of subsequent processes and improve the overall processing efficiency of the piston. The top riser milling mechanism 316 is mounted on the bed 302 and located at the front end of the front and rear conveying mechanisms 306, enabling milling of the top riser 202. After the piston blank is positioned and clamped once, it can perform one-time milling of each riser of a large piston for marine machinery, with a short cycle time and high production efficiency.

[0052] Furthermore, such as Figure 4As shown, the left chamfering mechanism 312 and the right chamfering mechanism 314 respectively include a mechanism support 3121, an adjusting rod 3122, a first slide 3123, a vertical guide rail 3124, a second slide 3126, a downward hydraulic cylinder 3127, an angle grinder 3129, and a small circular saw blade 3131. The mechanism support 3121 is mounted on the bed 302, and the adjusting rod 3122 is provided on the mechanism support 3121. The first slide 3123 is set on the mechanism support 3121 and is slidably connected to the mechanism support 3121. The bottom of the first slide 3123 is connected to the adjusting rod 3122, so that the relative position of the first slide 3123 on the mechanism support 3121 can be adjusted by adjusting the adjusting rod 3122. A vertical guide rail 3124 is mounted on a first slide 3123 via a vertical guide rail bracket 3125. A second slide 3126 is slidably connected to the vertical guide rail 3124 and can slide up and down along the vertical guide rail 3124. A downward hydraulic cylinder 3127 is fixedly mounted on the top of the vertical guide rail bracket 3125. The movable end of the downward hydraulic cylinder 3127 is slidably connected to the second slide 3126 via a downward hydraulic cylinder connecting plate 3128, which can push the second slide 3126 to slide up and down. An angle grinder 3129 is mounted on the downward hydraulic cylinder connecting plate 3128 via an angle grinder mounting bracket 3130. A small circular saw blade 3131 is mounted on the angle grinder 3129. The small circular saw blade 3131 is inclined and can mill the chamfers connecting the head 212 and the two sides of the skirt of the blank.

[0053] Furthermore, such as Figure 5 As shown, the angle grinder mounting bracket 3130 has multiple annularly distributed elongated groove-shaped angle grinder mounting holes 3132 to rotate and adjust the fixed position of the angle grinder 3129, and adjust the position and tilt angle of the small circular saw blade 3131. The position and tilt angle of the small circular saw blade 3131 can be adjusted according to the riser chamfer tilt angle; the diameter of the small circular saw blade 3131 can be adjusted accordingly according to the size of the piston blank and the size of the riser chamfer, thereby enabling milling of multiple types of chamfered risers. In a single clamping of the piston blank, milling of the risers on both sides and the top riser 202 is achieved simultaneously, while also chamfering the riser, reducing subsequent processing time and improving the overall processing efficiency of the piston.

[0054] Furthermore, such as Figure 4 As shown, the left chamfering mechanism 312 and the right chamfering mechanism 314 further include: a first proximity switch 3133 fixedly mounted on the vertical guide rail bracket 3125 via a switch mounting plate 3134, the first proximity switch 3133 being arranged adjacent to the vertical guide rail 3124; and a limiting screw 3135 mounted on the vertical guide rail bracket 3125 via a screw support 3136, located at the bottom of the vertical guide rail 3124. Thus, the vertical movement distance of the angle grinder 3129 and the small circular saw blade 3131 can be precisely controlled, further improving the milling accuracy for various types of chamfer risers.

[0055] Specifically, the position of the piston blank is pre-adjusted by adjusting the first slide 3123 via the adjusting rod 3122, based on the diameter of the piston blank. After the piston blank is transported to the corresponding working position by the front and rear conveying mechanisms 306, the downward cylinder 3127 is controlled to descend, guided by the vertical guide rail 3124, driving the angle grinder 3129, the angle grinder mounting bracket 3130, and the downward cylinder connecting plate 3128 to the chamfered area of ​​the piston blank. The angle grinder 3129 drives the small circular saw blade 3131 to mill the chamfer of the blank. After descending to the first proximity switch 3133, the descent stops, and the blank automatically resets, completing the chamfering action. The limiting screw 3135 at the bottom of the vertical guide rail 3124 can limit the downward position of the downward cylinder 3127, providing a certain degree of protection.

[0056] Furthermore, such as Figure 6 and Figure 7As shown, the loading / unloading mechanism 304 includes: a loading / unloading mechanism mounting plate 3041, longitudinal guide rails 3042, loading / unloading cylinders 3043, support side plates 3044, support top plates 3045, a first piston blank placement fixture 3048, a hydraulic motor 3049, gears 3050, racks 3051, a first limit switch 3052, a second limit switch 3053, a first stop block 3054, a second stop block 3055, a third limit switch 3056, a fourth limit switch 3057, a third stop block 3058, and a fourth stop block 3059. The loading / unloading mechanism mounting plate 3041 is fixedly mounted on one side of the bed 302, and longitudinal guide rails 3042 are provided on both sides of it. The loading / unloading cylinders 3043 are fixedly mounted on the bottom of the loading / unloading mechanism mounting plate 3041. The supporting side plate 3044 and the supporting top plate 3045 are connected in a cooperative manner. The piston rod of the upper and lower hydraulic cylinders 3043 is fixedly connected to the supporting side plate 3044 through the hydraulic cylinder connector 3046. The supporting side plate 3044 is slidably connected to the longitudinal guide rail 3042 on the loading and unloading mechanism mounting plate 3041. A piston blank loading and unloading plate 3047 is provided on the supporting top plate 3045. The piston blank loading and unloading plate 3047 is slidably connected to the supporting top plate 3045. A first piston blank placement fixture 3048 is provided on the piston blank loading and unloading plate 3047. A hydraulic motor 3049 is fixedly installed below the supporting top plate 3045. The drive shaft of the hydraulic motor 3049 passes through the supporting top plate 3045 and is connected to the piston blank loading and unloading plate 3047 through a gear 3050 and a rack 3051, thereby driving the piston blank loading and unloading plate 3047 to slide and translate the piston blank. A first limit switch 3052 and a second limit switch 3053 are arranged vertically at intervals on the support side plate 3044. A first impact block 3054 and a second impact block 3055 are arranged vertically at intervals on the loading and unloading mechanism mounting plate 3041. The first limit switches 3052 and 3053 are respectively configured to cooperate with the first impact blocks 3054 and 3055 to limit the upward and downward position of the support top plate 3045. A third limit switch 3056 and a fourth limit switch 3057 are arranged horizontally at intervals on the support top plate 3045. A third impact block 3058 and a fourth impact block 3059 are arranged horizontally at intervals on the piston blank loading and unloading plate 3047. The third limit switches 3056 and 3057 are respectively configured to cooperate with the third impact blocks 3058 and 3059 to limit the left and right movement of the piston blank loading and unloading plate 3047.

[0057] Specifically, the robotic arm places the piston blank at the first piston blank placement fixture 3048 of the loading and unloading mechanism 304. The lifting cylinder 3043 is controlled to raise the piston blank loading and unloading plate 3047 via the support top plate 3045. When the first limit switch 3052 reaches the first impact block 3054 and sends a positioning signal, the lifting cylinder 3043 is stopped, and the hydraulic motor 3049 is started, causing the piston blank loading and unloading plate 3047 to slide, thereby moving the piston blank to the second piston blank placement fixture 3064 of the front and rear conveying mechanism 306. When the third... After the limit switch 3056 reaches the third impact block 3058 and sends a positioning signal, the hydraulic motor 3049 is stopped. The upper and lower cylinders 3043 drive the piston blank loading and unloading plate 3047 to descend through the support top plate 3045. When the second limit switch 3053 reaches the second impact block 3055 and sends a positioning signal, the upper and lower cylinders 3043 are stopped, the hydraulic motor 3049 is started, and the piston blank loading and unloading plate 3047 slides back until the fourth limit switch 3057 reaches the fourth impact block 3059 and sends a positioning signal. At this point, the loading action is completed.

[0058] Furthermore, such as Figure 8As shown, the front and rear conveying mechanism 306 includes: a front and rear conveying mechanism mounting support 3061, a first guide rail 3062, a third slide table 3063, a second piston blank placement fixture 3064, a first servo motor 3065, a fifth limit switch 3066, a cylinder bracket 3067, a clamping cylinder 3068, a piston blank fixing fixture 3069, a guide rod 3070, a second proximity switch 3071-1, and a second proximity switch 3071-2. The front and rear conveying mechanism mounting support 3061 is fixedly mounted on the bed 302. The first guide rail 3062 is provided on the front and rear conveying mechanism mounting support 3061. The third slide table 3063 is slidably connected to the first guide rail 3062. The second piston blank placement fixture 3064 is provided on the third slide table 3063, which can receive piston blanks transmitted from the loading and unloading mechanism 304. A first servo motor 3065 is installed on one side of the mounting bracket 3061 of the front and rear conveying mechanism. The first servo motor 3065 is connected to the third slide 3063 and can push the third slide 3063 to move back and forth along the first guide rail 3062. Multiple fifth limit switches 3066 are fixedly installed on the mounting bracket 3061 of the front and rear conveying mechanism. The fifth limit switches 3066 are located on the outside of the first guide rail 3062. The side of the third slide 3063 is provided with a stop block that matches the fifth limit switch 3066, so that the position of the third slide 3063 and the piston blank on it can be precisely controlled. A cylinder bracket 3067 is fixedly installed on the third slide 3063. A clamping cylinder 3068 is fixedly installed on the cylinder bracket 3067. A piston blank fixing fixture 3069 is connected below the clamping cylinder 3068. The top mold of the piston blank fixing fixture 3069 is connected to a guide rod 3070. The guide rod 3070 passes through the cylinder bracket 3067 and is set upward. The piston blank fixing fixture 3069 is configured to cooperate with the second piston blank placement fixture 3064. It is driven downward by the clamping cylinder 3068 to achieve clamping and positioning of the piston blank. The second proximity switch 3071-1 and the second proximity switch 3071-2 are fixedly installed on the top of the cylinder bracket 3067 through the proximity switch bracket 3072 and are configured to cooperate with the guide rod 3070, thereby enabling limit control of the clamping and positioning of the piston blank.

[0059] Specifically, after the piston blank is moved to the second piston blank placement fixture 3064, the clamping cylinder 3068 is controlled to move downward. The piston blank fixing fixture 3069 cooperates with the second piston blank placement fixture 3064 to clamp the piston blank. The second proximity switch 3071-2 determines whether the downward movement of the clamping cylinder 3068 is in place, and the second proximity switch 3071-1 determines whether the upward reset of the clamping cylinder 3068 is in place. The first servo motor 3065 in the front and rear conveying mechanism 306 is controlled to drive the third slide 3063 and the piston blank to move forward and backward. The fifth limit switch 3066 is used for precise positioning to ensure the milling effect.

[0060] Furthermore, such as Figure 9 As shown, the left-moving milling mechanism 308 and the right-moving milling mechanism 310 respectively include: a milling mechanism mounting support 3081, a slide adjustment screw 3082, a fourth slide 3083, a power head slide 3084, a second servo motor 3086, a fifth slide 3088, a first milling machine 3089, a first spindle head 3090, a first tool holder connecting plate 3091, a first milling cutter 3092, a first tool holder 3092-1, a first shock absorber plate 3092-2, a first circular saw blade 3092-3, etc. A milling mechanism mounting bracket 3081 is fixedly mounted on the machine bed 302. A slide adjustment screw 3082 and a fourth slide 3083 are mounted on the milling mechanism mounting bracket 3081. The fourth slide 3083 is slidably connected to the milling mechanism mounting bracket 3081, and its bottom is connected to the slide adjustment screw 3082. The relative position of the fourth slide 3083 on the milling mechanism mounting bracket 3081 can be adjusted by the slide adjustment screw 3082. A power head slide 3084 is mounted on the fourth slide 3083. A second servo motor 3086 is fixedly mounted on the end of the power head slide 3084 via a motor mounting bracket 3085. A second guide rail 3087 is provided on the power head slide 3084. A fifth slide 3088 is provided on the power head slide 3084. The fifth slide 3088 is slidably connected to the second guide rail 3087. The second servo motor 3086 is connected to the fifth slide 3088, so that the fifth slide 3088 can move along the second guide rail 3087. This structure of servo motor and guide rail screw cooperation greatly improves the positioning accuracy, thereby allowing adjustment of the milling pin position and control of the remaining riser height. A first milling machine 3089 is fixedly installed on the fifth slide 3088. The first milling machine 3089 moves synchronously with the fifth slide 3088 to control the milling pin position. The first milling machine 3089 includes a first spindle head 3090 facing the front and rear conveying mechanism 306, a first tool holder connecting plate 3091 mounted on the first spindle head 3090, and a first milling cutter 3092 mounted on the first tool holder connecting plate 3091. The first milling cutter 3092 includes a first tool holder 3092-1 mounted on the first tool holder connecting plate 3091, a first shock absorber 3092-2 sleeved and mounted on the first tool holder 3092-1, and a first circular saw blade 3092-3. Thus, the blank head 212 and the connecting risers on both sides of the skirt can be removed simultaneously.

[0061] Furthermore, such as Figure 3As shown, the top-mount milling mechanism 316 includes: a top-mount milling mechanism support 3161, a third guide rail 3162, a sixth slide table 3163, a third servo motor 3164, a second milling machine 3165, a second spindle head 3166, a second tool holder connecting plate 3167, a second milling cutter 3168, a second tool holder 3168-1, a second shock absorber plate 3168-2, and a second circular saw blade 3168-3, etc. The top-mount milling mechanism support 3161 is fixedly installed on the bed 302 and is located at the front end of the front and rear conveying mechanism 306. The third guide rail 3162 is provided on the top-mount milling mechanism support 3161. The sixth slide 3163 is mounted on the top riser milling mechanism support 3161 and is slidably connected to the third guide rail 3162. The end of the top riser milling mechanism support 3161 is equipped with a third servo motor 3164, which is connected to the sixth slide 3163. Thus, the third servo motor 3164 drives the sixth slide 3163 to move along the third guide rail 3162. The second milling machine 3165 is fixedly mounted on the sixth slide 3163. The second milling machine 3165 includes a second spindle head 3166 facing the end of the front-rear conveying mechanism 306, a second tool holder connecting plate 3167 mounted on the second spindle head 3166, and a second milling cutter 3168 mounted on the second tool holder connecting plate 3167. The second milling cutter 3168 includes a second tool holder 3168-1 mounted on the second tool holder connecting plate 3167, a second shock absorber plate 3168-2 sleeved and mounted on the second tool holder 3168-1, and a second circular saw blade 3168-3. Thus, the top side riser 202 can be removed simultaneously.

[0062] Furthermore, such as Figure 8 As shown, a lubrication distributor 318 is installed on the mounting support 3061 of the front and rear conveying mechanisms. The lubrication distributor 318 is connected to the self-lubricating device pipelines of the first milling cutter 3092 and the second milling cutter 3168. During machining, cutting fluid can be sprayed at the milling position, and the position is adjustable. The spraying time interval can be adjusted on the touch screen, and the spraying amount is adjustable, which can effectively extend the service life of the first milling cutter 3092 and the second milling cutter 3168. When the circular saw blade is milling, the atomization cooling mode is turned on to cool and lubricate the circular saw blade.

[0063] The piston riser milling method according to an embodiment of the present invention, using the piston riser milling apparatus of the above embodiment, includes the following steps:

[0064] The robotic arm places the piston blank at the first piston blank placement fixture 3048 of the loading and unloading mechanism 304. The lifting cylinder 3043, via the support top plate 3045, raises the piston blank loading and unloading plate 3047. When the first limit switch 3052 reaches the first stop block 3054 and sends a signal, the lifting cylinder 3043 stops, and the hydraulic motor 3049 starts, causing the piston blank loading and unloading plate 3047 to slide, thereby moving the piston blank to the second piston blank placement fixture 3064 of the front and rear conveying mechanism 306. When the third impact block 3058 reaches the third limit switch 3056 and sends a positioning signal, the hydraulic motor 3049 is stopped. The upper and lower cylinders 3043 drive the piston blank loading plate 3047 to descend through the support top plate 3045. When the second limit switch 3053 reaches the second impact block 3055 and sends a positioning signal, the upper and lower cylinders 3043 are stopped, the hydraulic motor 3049 is started, and the piston blank loading plate 3047 slides back until the fourth impact block 3059 reaches the fourth limit switch 3057 and sends a positioning signal.

[0065] The clamping cylinder 3068 is lowered, and the piston blank fixing fixture 3069 and the second piston blank placement fixture 3064 cooperate to press the piston blank.

[0066] The first servo motor 3065 in the front and rear conveying mechanism 306 drives the third slide 3063 and the piston blank forward 300mm. During this process, the left moving milling mechanism 308 and the right moving milling mechanism 310 respectively perform preliminary milling on the blank head 212 and the risingers on both sides of the skirt (i.e., side riser one 204 and side riser two 206) of the piston blank, realizing... Figure 10 Action 1 shown;

[0067] The first servo motor 3065 in the front and rear conveying mechanism 306 drives the third slide 3063 and the piston blank to advance 600mm. Simultaneously, the third servo motor 3164 in the top riser milling mechanism 316 drives the sixth slide 3163 to move. The second milling machine 3165 on the sixth slide 3163 mills the top riser 202. After completion, it resets, thus achieving... Figure 10 Action 2 shown;

[0068] The first servo motor 3065 in the front and rear conveying mechanism 306 drives the third slide table 3063 and the piston blank to move backward 200mm. This controls the downward movement of the hydraulic cylinders 3127 in the left chamfering mechanism 312 and the right chamfering mechanism 314, driving the small circular saw blade 3131 on the angle grinder 3129 to mill the chamfers connecting the head 212 and the two sides of the skirt (i.e., the head and skirt chamfers 208). After completion, the mechanism resets, thus achieving... Figure 10 Action three is shown;

[0069] The first milling machine 3089 in the left-moving milling mechanism 308 and the right-moving milling mechanism 310 is controlled to advance 10mm, and the first servo motor 3065 in the front and rear conveying mechanism 306 is controlled to drive the third slide 3063 and the piston blank to continue to retreat 150mm, so as to perform secondary milling on the residual riser of the blank skirt 210, thereby achieving... Figure 10 Action four is shown;

[0070] The first servo motor 3065 in the front and rear conveying mechanism 306 drives the third slide table 3063 and the piston blank to continue to move forward by 250mm, while controlling the first milling machine 3089 in the left moving milling mechanism 308 and the right moving milling mechanism 310 to move backward by 50mm.

[0071] The first servo motor 3065 in the front and rear conveying mechanism 306 drives the third slide table 3063 and the piston blank to move back 800mm to the initial position. The loading and unloading mechanism 304 is controlled to complete the unloading. The robot arm takes away the piston blank after the riser is removed from the loading and unloading mechanism 304.

[0072] Thus, after the piston blank is positioned and clamped once, it is possible to perform one-time milling of each riser of the large piston of marine machinery. The equipment cycle time is short and the production efficiency is high. Moreover, the forward and backward strokes of the piston blank are reasonably designed, which saves time while ensuring milling. At the same time, the residual riser of the skirt 210 of the blank can be milled again during the backward process, which has higher accuracy and reliability.

[0073] In this invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0074] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0075] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0076] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A piston riser milling device, characterized by, It includes: bed; feeding and discharging mechanism installed on one side of the bed; front and rear conveying mechanism installed on the bed, one end of the front and rear conveying mechanism is arranged adjacent to the feeding and discharging mechanism, and the feeding and discharging mechanism conveys the piston blank to below the piston blank fixing tool of the front and rear conveying mechanism; cooperatively arranged left and right movable milling mechanisms are installed on the bed and are respectively located on the left and right sides of the front and rear conveying mechanism; cooperatively arranged left and right chamfering mechanisms are installed on the bed and are respectively located on the left and right sides of the front and rear conveying mechanism, and along the advancing direction of the front and rear conveying mechanism, the piston blank first passes below the left and right movable milling mechanisms and then passes below the left and right chamfering mechanisms; top head milling mechanism is installed on the bed and is located at the front end of the front and rear conveying mechanism; The left and right chamfering mechanisms respectively include: mechanism support installed on the bed, the mechanism support is provided with an adjusting rod; first sliding table is arranged on the mechanism support and is in sliding connection with the mechanism support, and the bottom of the first sliding table is connected with the adjusting rod, so that the relative position of the first sliding table on the mechanism support is adjusted through the adjusting rod; vertical guide rail is installed on the first sliding table through a vertical guide rail support; second sliding table is in sliding connection with the vertical guide rail; downward oil cylinder is fixedly installed on the top of the vertical guide rail support, and the movable end of the downward oil cylinder is in sliding connection with the second sliding table through a downward oil cylinder connecting plate, so as to push the second sliding table to slide up and down; angle grinder is installed on the downward oil cylinder connecting plate through an angle grinder mounting support, a small circular saw blade is installed on the angle grinder, and the small circular saw blade is arranged in an inclined manner.

2. The piston head milling device according to claim 1, wherein: a plurality of annularly distributed long slot-shaped angle grinder mounting holes are formed in the angle grinder mounting support, so as to rotate and adjust the fixed position of the angle grinder and adjust the position and inclination angle of the small circular saw blade.

3. The piston riser cutting device of claim 1 wherein, The left and right chamfering mechanisms further include: first proximity switch is fixedly installed on the vertical guide rail support through a switch mounting plate and is arranged adjacent to the vertical guide rail; limiting screw is installed on the vertical guide rail support through a screw support and is located at the bottom of the vertical guide rail.

4. The piston riser cutting device of any one of claims 1 to 3, wherein, The feeding and discharging mechanism includes: feeding and discharging mechanism mounting plate is fixedly installed on one side of the bed, and longitudinal guide rails are arranged on both sides of the feeding and discharging mechanism mounting plate; up and down oil cylinder is fixedly installed on the bottom of the feeding and discharging mechanism mounting plate; supporting side plate and supporting top plate are arranged in cooperation and connection, the piston rod of the up and down oil cylinder is fixedly connected with the supporting side plate through an oil cylinder connecting piece, and the supporting side plate is in sliding connection with the longitudinal guide rails on the feeding and discharging mechanism mounting plate; piston blank feeding and discharging plate is arranged on the supporting top plate and is in sliding connection with the supporting top plate, and a first piston blank placing tool is arranged on the piston blank feeding and discharging plate; A hydraulic motor is fixedly installed below the support top plate, and a drive shaft thereof is connected with the piston blank feeding plate through a gear and a rack to drive the piston blank feeding plate to slide and translate the piston blank; First and second travel switches are arranged on the support side plate in an up-and-down manner, and first and second bumpers are arranged on the feeding mechanism mounting plate in an up-and-down manner, so as to limit the upward and downward movement of the support top plate; Third and fourth travel switches are arranged on the support top plate in a left-and-right manner, and third and fourth bumpers are arranged on the piston blank feeding plate in a left-and-right manner, so as to limit the left-and-right movement of the piston blank feeding plate.

5. The piston riser cutting device of claim 4, wherein, The front-and-back conveying mechanism comprises: A front-and-back conveying mechanism mounting support is fixedly installed on the bed, and a first guide rail is arranged on the front-and-back conveying mechanism mounting support; A third sliding table is slidably connected with the first guide rail, and a second piston blank placing tool is arranged on the third sliding table; A first servo motor is installed on one side of the front-and-back conveying mechanism mounting support and connected with the third sliding table to drive the third sliding table to move forward and backward along the first guide rail; A plurality of fifth travel switches are fixedly installed on the front-and-back conveying mechanism mounting support and located outside the first guide rail, and bumpers matched with the fifth travel switches are arranged on the side surface of the third sliding table; An oil cylinder support is fixedly installed on the third sliding table; A clamping oil cylinder is fixedly installed on the oil cylinder support, and a piston blank fixing tool is connected below the clamping oil cylinder; a guide rod is connected to the top surface of the piston blank fixing tool, and the guide rod is arranged upward through the oil cylinder support; the piston blank fixing tool is arranged in cooperation with the second piston blank placing tool; A second proximity switch is fixedly installed on the top of the oil cylinder support through a proximity switch support and arranged in cooperation with the guide rod.

6. The piston riser cutting device of claim 5, wherein, The left and right movable milling mechanisms respectively comprise: A milling mechanism mounting support is fixedly installed on the bed, and a sliding table adjusting screw is arranged on the milling mechanism mounting support; A fourth sliding table is arranged on the milling mechanism mounting support and slidably connected with the milling mechanism mounting support, and the bottom of the fourth sliding table is connected with the sliding table adjusting screw to adjust the relative position of the fourth sliding table on the milling mechanism mounting support through the sliding table adjusting screw; A power head sliding table is installed on the fourth sliding table, and a second servo motor is fixedly installed on the end of the power head sliding table through a motor mounting support; a second guide rail is arranged on the power head sliding table; A fifth sliding table is arranged on the power head sliding table and slidably connected with the second guide rail, and the second servo motor is connected with the fifth sliding table to drive the fifth sliding table to move along the second guide rail; A first milling machine is fixedly installed on the fifth sliding table, and the first milling machine comprises a first spindle head facing the front and rear conveying mechanism, a first tool bar coupling disc installed on the first spindle head, and a first milling cutter installed on the first tool bar coupling disc. The first milling cutter comprises a first tool bar installed on the first tool bar coupling disc, a first shock absorbing disc installed on the first tool bar, and a first circular saw blade.

7. The piston riser cutting device of claim 6, wherein, The top riser milling mechanism comprises: A top riser milling mechanism support is fixedly installed on the bed and located at the front end of the front and rear conveying mechanism. A third guide rail is arranged on the top riser milling mechanism support. A sixth sliding table is installed on the top riser milling mechanism support and is in sliding connection with the third guide rail. A third servo motor is installed at the end of the top riser milling mechanism support and is connected with the sixth sliding table to drive the sixth sliding table to move along the third guide rail. A second milling machine is fixedly installed on the sixth sliding table. The second milling machine comprises a second spindle head facing the end of the front and rear conveying mechanism, a second tool bar coupling disc installed on the second spindle head, and a second milling cutter installed on the second tool bar coupling disc. The second milling cutter comprises a second tool bar installed on the second tool bar coupling disc, a second shock absorbing disc installed on the second tool bar, and a second circular saw blade.

8. The piston riser milling device according to claim 7, wherein The first milling cutter and the second milling cutter are provided with self-lubricating devices. A lubricating oil distributor is arranged on the conveying mechanism mounting support and is connected with the self-lubricating devices through pipelines.

9. A method of piston sprue milling, characterized by, The piston riser milling device according to any one of claims 1 to 8 comprises the following steps: The mechanical hand places the piston blank at the first piston blank placing tool of the feeding and discharging mechanism. The up and down oil cylinder drives the piston blank up and down through the support top plate. When the first travel switch reaches the first stopper and sends a signal, the up and down oil cylinder stops. The hydraulic motor is started to drive the piston blank up and down plate to slide and move horizontally to the second piston blank placing tool of the front and rear conveying mechanism. When the third stopper reaches the third travel switch and sends a signal, the hydraulic motor stops. The up and down oil cylinder drives the piston blank up and down through the support top plate. When the second travel switch reaches the second stopper and sends a signal, the up and down oil cylinder stops. The hydraulic motor is started to drive the piston blank up and down plate to slide back until the fourth stopper reaches the fourth travel switch and sends a signal. The clamping oil cylinder is controlled to descend. The piston blank fixing tool cooperates with the second piston blank placing tool to press the piston blank. The first servo motor of the front and rear conveying mechanism drives the third sliding table and the piston blank to move forward by 300 mm. In this process, the left moving type milling mechanism and the right moving type milling mechanism respectively perform preliminary milling on the blank head and the riser on both sides of the blank of the piston blank. The first servo motor in the front and rear conveying mechanism drives the third sliding table and the piston blank to continue advancing 600 mm, and the third servo motor in the top head milling mechanism drives the sixth sliding table to move, and the second milling machine on the sixth sliding table mills the top head, and then resets after completion; The first servo motor in the front and rear conveying mechanism drives the third sliding table and the piston blank to retreat 200 mm, and the down-going oil cylinder in the left and right chamfering mechanisms drives the small circular saw blade on the angle grinder to mill the connecting chamfers on the head and skirt of the blank, and then resets after completion; The first milling machine in the left and right movable milling mechanisms advances 10 mm, and the first servo motor in the front and rear conveying mechanism drives the third sliding table and the piston blank to continue retreating 150 mm to perform secondary milling on the residual head of the blank; The first servo motor in the front and rear conveying mechanism drives the third sliding table and the piston blank to continue advancing 250 mm, and the first milling machine in the left and right movable milling mechanisms retreats 50 mm at the same time; The first servo motor in the front and rear conveying mechanism drives the third sliding table and the piston blank to retreat 800 mm to the initial position, and the feeding and discharging mechanism completes discharging, and the manipulator takes away the piston blank after the head is removed from the feeding and discharging mechanism.

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