A flexible machining system and a housing machining method

Abstract

The present invention relates to the technical field of machining, and provides a flexible machining system and a housing machining method. The flexible machining system includes: a first CNC vertical lathe, a second CNC vertical lathe, a first horizontal machining center, a first hydraulic press, and a first laser marking machine; the first horizontal machining center is equipped with a face milling cutter, an internal hole milling cutter, a side groove milling cutter, and a faceplate; a horizontal machining center fixture is arranged on the first horizontal machining center. The equipment of the present invention is complete in variety, so as to meet various process requirements, improve machining efficiency and product precision, and reduce the machining difficulty of internal cavity inclined holes.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical processing, and in particular to a flexible processing system and a shell processing method. Background Art

[0002] The shell products on the excavator are of many types and small batches. Its main processing content is the installation stoppers and installation holes on both sides, as well as the inner cavity inclined holes with side grooves and bottom cleaning. The processing content is many and the precision requirements are high. The optimal process solution is to use the smallest processing unit, the least processing equipment, and highly integrated processing. Such shell products have many advantages such as high precision, high yield rate, low cost, etc., and are very competitive.

[0003] like Figures 1-4 As shown, the shell 1 of the excavator has a convex end, a concave end, and a peripheral block 106. The outside of the convex end has a convex stop 101, a convex end inner hole 102, a convex end sealing groove 103, a convex end mounting surface 104, and a convex end mounting hole 105. The concave end has a concave end sealing groove 107, a concave end positioning hole 108, a concave end mounting surface 109, and a concave end mounting hole 110. The peripheral block 106 has surfaces and holes. The inner cavity of the shell 1 has multiple concentric inner cavity inclined holes 111, the bottom of the inner cavity inclined holes needs to be cleaned, and there are disconnected grooves on the side and need to be cleaned; depending on the different functions of the excavator shell product, the surfaces and holes that need to be processed on the periphery will change accordingly.

[0004] There is a small through hole in the center of the bottom surface of the inner cavity inclined hole 111 of the housing 1, and the rest of the parts need to be processed. There are three inner holes 112 on the side that need to be processed, especially the outermost inner hole is disconnected and consists of four arcs. There is a groove 113 on the side, which is also disconnected into four arcs, and the end of the groove 113 is cleaned in the radial direction. The most difficult part of the inner cavity inclined hole to be processed is at the root 114 of the hole bottom, which is cleaned in both the radial and axial directions, which brings great difficulties to the milling process.

[0005] Initially, ordinary equipment was used for processing, which required multiple processes such as turning, milling, and drilling. The process route was long, the process steps were numerous, and the processing accuracy was low. Later, when CNC lathes and machining centers became popular, in order to improve the integration of the processing technology, three CNC vertical lathes and two vertical machining centers were used. In order to reduce turnover, the above equipment was closely arranged together. Such processing units and process methods have limitations and are only suitable for large batches and unchanging processes. There are few types of existing technical equipment, which are only suitable for products with relatively simple processing technology and large batches. When the processed products are of many types and small batches, there will be a variety of process requirements. The existing processing system cannot meet the above requirements at all due to the small number of equipment types. It is not flexible. Even if the equipment is simply added and the equipment types are expanded, it will inevitably increase the moving distance of operators between each station, which also brings insecurity.

[0006] There are a total of five processes for machining the housing product in the existing machining system. The first process is to machine the convex end mounting surface 104, convex stop 101, convex end inner hole 102, convex end seal groove 103, etc. on a CNC vertical lathe; the second process is to machine the concave end mounting surface 109, concave end positioning hole 108, concave end seal groove 107, etc. on another CNC vertical lathe; the third process is to machine the concave end mounting hole 110, etc. on a vertical machining center; the fourth process is to machine the convex end mounting hole 105, the surfaces and holes on the outer peripheral block 106, etc. on another vertical machining center; the fifth process is to machine the inner cavity inclined hole 111 on yet another CNC vertical lathe. Such a machining method has numerous processes, resulting in low accuracy of the housing product due to large cumulative errors and low production efficiency due to a large amount of auxiliary working hours, with obvious deficiencies.

[0007] In addition, for the machining of the inner cavity inclined hole 111, traditional equipment uses turning tools such as turning tools and grooving tools to complete the machining. When the fixture and the housing product are rotating during machining on the CNC vertical lathe, the overall weight is relatively large and there is a certain amount of unbalance, which limits the rotational speed. It can only be machined at a low speed, and the machining efficiency is thus restricted. Additionally, although the turning tools are relatively simple, the number of machining steps is numerous, which will inevitably lead to a significant increase in auxiliary working hours such as debugging and turnover. There is no advantage in the case of small batches. Summary of the Invention

[0008] The present invention mainly solves the technical problems in the existing machining system, such as few types of equipment, only being suitable for machining products with relatively simple processes and large batches, lacking flexibility, and difficult machining of inner cavity inclined holes. A flexible machining system and a housing machining method are proposed, with a complete range of equipment types to meet various process requirements, improve machining efficiency and product accuracy, and reduce the machining difficulty of inner cavity inclined holes.

[0009] The present invention provides a flexible machining system, including: a first CNC vertical lathe, a second CNC vertical lathe, a first horizontal machining center, a first weighing press, and a first laser marking machine;

[0010] The first horizontal machining center is equipped with a face milling cutter, an inner hole milling cutter, a side groove milling cutter, and a faceplate;

[0011] A horizontal machining center fixture is provided on the first horizontal machining center;

[0012] The horizontal machining center fixture includes: a bottom plate, a vertical plate, a centering disk, an angular positioning seat, a pushing beam, a lower support seat, a right support seat, a lever clamping cylinder, a push-type clamping cylinder, a support cylinder, a steel ball bolt, and a quick clamp;

[0013] The bottom plate is installed on the first horizontal machining center; a vertical plate is arranged on the bottom plate, and a through hole is arranged in the middle of the vertical plate; the centering disc is installed on the through hole of the vertical plate; the centering disc has an inner hole;

[0014] An angular positioning seat, a lower support seat and a right support seat are respectively arranged on the bottom plate; a steel ball bolt is arranged at the top of the angular positioning seat;

[0015] A first support cylinder is arranged at the top of the lower support seat;

[0016] A second support cylinder is arranged inside the right support seat;

[0017] A pushing beam is arranged at the upper part of the vertical plate; a push-type clamping cylinder and a third support cylinder are arranged on the bottom surface of the pushing beam; the push-type clamping cylinder and the steel ball bolt are on the same vertical axis;

[0018] Quick clamps and a plurality of lever clamping cylinders are arranged around the centering disc on the vertical plate.

[0019] Preferably, it further includes: a first marble detection platform and a second marble detection platform.

[0020] Preferably, it further includes: one or more of a third CNC vertical lathe, a CNC horizontal lathe, a first vertical machining center, a second horizontal machining center, a second vertical machining center, a second hydraulic press, and a second laser marking machine.

[0021] Preferably, the second vertical machining center adopts a five-axis vertical machining center.

[0022] Preferably, it further includes: a plurality of AGV automatic transfer vehicles.

[0023] Preferably, it further includes: a plurality of chip removal vehicles.

[0024] Preferably, two gusset plates are arranged on the back of the vertical plate.

[0025] Preferably, a reversing valve, a joint and an accumulator are respectively arranged on the bottom plate;

[0026] The accumulator is located on the back of the vertical plate;

[0027] The joint is connected to the reversing valve through a pipeline, and the reversing valve is connected to the push-type clamping cylinder through a pipeline.

[0028] Preferably, a pressure gauge is arranged on the vertical plate;

[0029] A first sequence valve and a second sequence valve are arranged on the back of the vertical plate;

[0030] The first sequence valve is connected to the reversing valve through a pipeline; the first sequence valve is connected to a plurality of lever clamping cylinders through a pipeline;

[0031] The second sequence valve is connected to the first sequence valve through pipelines; the second sequence valve is connected to the first support cylinder, the second support cylinder, and the third support cylinder through pipelines.

[0032] Correspondingly, the present invention also provides a method for machining a housing, including the following processes:

[0033] Step 1: First, transfer the housing of the excavator from the blank warehouse to the first CNC vertical lathe. Then, clamp the housing blank onto the fixture already installed on the workbench of the first CNC vertical lathe, with the convex end of the housing facing upwards. First, perform turning machining on the convex stop, the inner hole of the convex end, and the convex end sealing groove. After machining, unload the product and place it on the workbench of the first CNC vertical lathe. Then, the operator controls the AGV automatic transfer vehicle to automatically transfer the product to the second CNC vertical lathe.

[0034] Step 2: Clamp the housing onto the fixture already installed on the workbench of the second CNC vertical lathe, with the concave end of the housing product facing upwards. Use the already machined convex stop to position and clamp with the fixture. Then, machine the concave end positioning hole and the concave end sealing groove. After machining, unload the product and place it on the workbench of this station. Then, the operator controls the AGV automatic transfer vehicle to automatically transfer the product to the first horizontal machining center.

[0035] Step 3: Clamp the housing onto the horizontal machining center fixture already installed on the workbench of the first horizontal machining center, place the housing horizontally, with the concave end facing the spindle end of the first horizontal machining center. Still use the already machined convex stop to position and clamp with the fixture. Then, machine the convex end mounting hole, the concave end mounting hole, and the surfaces and holes of the outer peripheral block.

[0036] Step 4: Machine the inner cavity inclined hole. Install the face milling cutter on the spindle of the first horizontal machining center, and use the circular interpolation milling method to machine the bottom surface of the inner cavity inclined hole. Machine it in three passes axially. The first two passes are rough machining, with the machining allowance between 2 mm and 3 mm. The last pass is finish machining, with the machining allowance between 0.1 mm and 0.2 mm. Install the inner hole milling cutter on the spindle of the first horizontal machining center, and also use the circular interpolation milling method to mill multiple general tolerance inner holes. Install the inner hole machine-clamped rough milling cutter on the spindle of the first horizontal machining center, and rough mill the strict tolerance inner hole. Then, replace it with the inner hole machine-clamped finish milling cutter to finish mill the strict tolerance inner hole. Install the side groove milling cutter on the spindle of the first horizontal machining center, and perform multiple rough machining laterally, with the machining allowance between 0.8 mm and 1.5 mm. Generally, finish machining requires one pass, and the machining allowance is controlled between 0.05 mm and 0.1 mm.

[0037] Step 5: Install the faceplate on the spindle of the first horizontal machining center. Control the faceplate to move to the center coordinates of the X-axis and Y-axis of the inner cavity inclined hole. Rotate the spindle forward. Then, the numerical control system controls the movement of each axis until the starting point of the inner bevel angle at the bottom root of the hole moves to the tip of the faceplate. At this time, the numerical control system starts the servo motor of the faceplate and drives the tip to move outward through the transmission mechanism inside the faceplate. At the same time, the housing moves along the Z-axis towards the spindle end. After reaching the axial depth of the bottom root of the hole, stop the movement in the Z-axis direction. Through the linkage of the two, the machining of the inner bevel angle at the bottom root of the hole is completed. Then, the tip of the faceplate continues to move outward. After reaching the radial depth of the bottom root of the hole, stop moving, and the machining of the chamfering at the outer bottom root of the hole is completed. Then, retract the tool and transfer the faceplate into the tool magazine for direct calling during the next machining. The operator unloads the machined housing, and then controls the AGV automatic transfer vehicle to automatically transfer the housing to the first press.

[0038] Step 6: Install the housing on the fixture already installed on the workbench of the first press. Start each cylinder to seal and clamp the housing. Then start the pressing. If the control panel of the first press shows that the pressing is unqualified, the operator unloads it and controls the AGV automatic transfer vehicle to transfer it to the waste area. If it is qualified, the operator unloads it.

[0039] When machining the housing of the excavator again, repeat the above steps 1 to 6.

[0040] A flexible machining system and a housing machining method provided by the present invention have the following advantages compared with the prior art:

[0041] 1. The flexible machining system of the present invention includes the first CNC vertical lathe, the second CNC vertical lathe, the third CNC vertical lathe, the CNC horizontal lathe, the first vertical machining center, the first horizontal machining center, the second horizontal machining center, the second vertical machining center, the press, the laser marking machine, the AGV automatic transfer vehicle, etc. It has a complete variety of equipment, can meet various process requirements, has high machining efficiency and high product precision, and has extremely strong versatility. Simplify the machining process of the excavator housing, and change the turning machining of the inner cavity inclined hole to milling machining. The present invention adapts to the characteristics of a large variety of housing products, small batch sizes, and flexible process changes. It is not only applicable to the machining of almost all excavator housing products, but also applicable to the machining of the vast majority of products such as end covers, shafts, boxes, brackets, etc. This flexible machining unit completely solves the deficiencies of the existing machining units. It can not only machine one product, but also can produce multiple products simultaneously when the production plan is reasonably arranged.

[0042] 2. Through the application of the flexible machining system of the present invention, the requirements for shortening and optimizing the machining process of the excavator housing products are flexibly met. Compared with the previous machining processes, the single-piece production cost of the housing products is low, the finished product rate is high, and the machining accuracy is high, among other advantages. This flexible machining system has strong inclusiveness and can adapt to the needs of various different machining processes such as long processes, short processes, simple processes, and complex processes. It is not only limited to excavator housing products, but can also be applied to most medium and small-sized products, and can be widely used, and can fundamentally solve the above-mentioned problems.

[0043] 3. Equipped with an AGV automatic transfer vehicle to solve the turnover between workstations. It can automatically transfer products, tooling, etc. Through the cooperation among operators, the moving distance of personnel is greatly saved, the auxiliary working hours are shortened, and it fully has flexibility.

[0044] 4. The internal cavity inclined holes of the excavator housing products can be improved to be machined on a horizontal machining center using special milling cutters. In this way, the processes of the vertical machining center and the CNC vertical lathe can be combined into the process of the horizontal machining center to complete, further improving the process integration degree. Special milling cutters such as face milling cutters, internal hole milling cutters, side groove milling cutters, and hole bottom root clearing CNC facing heads are used for the internal cavity inclined holes. When the fixture and the housing product are stationary during machining and cutting on the horizontal machining center, the milling cutter rotates. Since the cutter is much smaller compared to the fixture and the housing product and has been dynamically balanced, it can be machined at high speeds. Therefore, the cutting working hours of the internal cavity inclined holes will not be more than before, and may even be reduced. In addition, after the processes are combined, the auxiliary working hours such as debugging and turnover are significantly reduced, which has a very obvious advantage in the case of small batches, and the overall machining efficiency is also significantly improved.

[0045] 5. The bottom surface of the internal cavity inclined hole is machined using a face milling cutter; the three internal holes on the side are machined using different milling cutters; the side grooves are machined using a formed milling cutter, and the cutting edge of the milling cutter is the same as the shape of the internal cavity inclined hole groove. Through the circular interpolation function of the horizontal machining center, the groove machining is gradually completed; due to the root clearing treatment in both the radial and axial directions at the hole bottom root, the milling difficulty is large, so a facing head with CNC function is used for machining. When the tool head on the facing head touches the bottom surface of the internal cavity inclined hole, the axial machining is realized through the axial feed function of the horizontal machining center, and the radial machining is realized through the CNC function of the facing head, thus realizing the root clearing treatment at the hole bottom root. Through the use of the above series of special milling cutters, the milling machining of the internal cavity inclined holes is realized, effectively shortening the machining process of the housing products. Description of the Drawings

[0046] Figure 1 is the front view of the excavator housing product to be machined in the present invention;

[0047] Figure 2It is the bottom view of the excavator housing product to be processed in the present invention;

[0048] Figure 3 It is the cross-sectional view of the inclined hole in the inner cavity of the excavator housing product to be processed in the present invention;

[0049] Figure 4 It is the enlarged view of the root of the inclined hole in the inner cavity of the excavator housing product to be processed in the present invention;

[0050] Figure 5 It is the schematic diagram of the composition of the flexible machining system provided by the present invention Figure 1 ;

[0051] Figure 6 It is the schematic diagram of the composition of the flexible machining system provided by the present invention Figure 2 ;

[0052] Figure 7 It is the structural schematic diagram of the numerically controlled horizontal lathe of the present invention;

[0053] Figure 8 It is the structural schematic diagram of the numerically controlled vertical lathe of the present invention;

[0054] Figure 9 It is the structural schematic diagram of the horizontal machining center of the present invention;

[0055] Figure 10 It is the structural schematic diagram of the vertical machining center of the present invention;

[0056] Figure 11 It is the structural schematic diagram of the five-axis vertical machining center of the present invention;

[0057] Figure 12 It is the structural schematic diagram of the pound press of the present invention;

[0058] Figure 13 It is the structural schematic diagram of the laser marking machine of the present invention;

[0059] Figure 14 It is the structural schematic diagram of the marble inspection platform of the present invention;

[0060] Figure 15 It is the structural schematic diagram of milling the bottom surface of the internal inclined hole of the present invention;

[0061] Figure 16 It is the structural schematic diagram of milling the inner hole with general tolerance of the internal inclined hole of the present invention;

[0062] Figure 17 It is the structural schematic diagram of rough milling the inner hole with strict tolerance of the internal inclined hole of the present invention;

[0063] Figure 18 It is the structural schematic diagram of finish milling the inner hole with strict tolerance of the internal inclined hole of the present invention;

[0064] Figure 19 It is a schematic structural diagram of milling the side groove of the internal inclined hole of the present invention;

[0065] Figure 20 It is a schematic structural diagram of root clearing at the bottom of the internal inclined hole of the present invention;

[0066] Figure 21 It is a schematic structure of the fixture of the horizontal machining center of the present invention Figure 1 ;

[0067] Figure 22 It is a schematic structure of the fixture of the horizontal machining center of the present invention Figure 2 ;

[0068] Figure 23 It is a schematic diagram of the clamping state of the fixture of the horizontal machining center of the present invention Figure 1 ;

[0069] Figure 24 It is a schematic diagram of the clamping state of the fixture of the horizontal machining center of the present invention Figure 2 .

[0070] Reference numerals: 1. housing; 2. first CNC vertical lathe; 3. second CNC vertical lathe; 4. AGV automatic transfer vehicle; 5. third CNC vertical lathe; 6. CNC horizontal lathe; 7. first vertical machining center; 8. first horizontal machining center; 9. face milling cutter; 10. internal hole milling cutter; 11. internal hole indexable rough milling cutter; 12. internal hole indexable finish milling cutter; 13. side groove milling cutter; 14. faceplate; 15. first press; 16. first laser marking machine; 17. first marble inspection platform; 18. second horizontal machining center; 19. second vertical machining center; 20. first press; 21. first laser marking machine; 22. second marble inspection platform;

[0071] 101. convex stop; 102. convex end inner hole; 103. convex end seal groove; 104. convex end mounting surface; 105. convex end mounting hole; 106. outer peripheral block; 107. concave end seal groove; 108. concave end positioning hole; 109. concave end mounting surface; 110. concave end mounting hole; 111. internal cavity inclined hole; 112. inner hole; 113. groove; 114. hole bottom root;

[0072] 801. bottom plate; 802. vertical plate; 803. angle plate; 804. centering disk; 805. angular positioning seat; 806. push beam; 807. lower support seat; 808. right support seat; 809. lever clamping cylinder; 810. push-type clamping cylinder; 811. support cylinder; 812. first sequence valve; 813. second sequence valve; 814. reversing valve; 815. joint; 816. pressure gauge; 817. accumulator; 818. steel ball bolt; 819. quick clamp. Detailed implementation manner

[0073] To make the technical problems solved by the present invention, the adopted technical solutions and the achieved technical effects clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the convenience of description, only the parts related to the present invention are shown in the drawings, rather than all the content.

[0074] As Figures 5-20 shown, a flexible machining system provided by an embodiment of the present invention includes: a first CNC vertical lathe 2, a second CNC vertical lathe 3, a first horizontal machining center 8, a first hydraulic press 15, and a first laser marking machine 16.

[0075] The flexible machining system of the present invention further includes one or more of: a third CNC vertical lathe 5, a CNC horizontal lathe 6, a first vertical machining center 7, a second horizontal machining center 18, a second vertical machining center 19, a second hydraulic press 20, and a second laser marking machine 21. The second vertical machining center 19 adopts a five-axis vertical machining center.

[0076] The flexible machining system of the present invention further includes: a first marble inspection platform 17 and a second marble inspection platform 22.

[0077] The flexible machining system of the present invention further includes: multiple chip conveyors.

[0078] The two end faces of the housing 1 are generally suitable for machining by a vertical machining center in aspects such as milling, drilling, boring, and reaming. The milling, drilling, boring, and reaming of the circumferential side are generally suitable for machining by a horizontal machining center. When there are strict geometric tolerance requirements for the machining content of the end face and the circumferential side, a five-axis vertical machining center can meet such special requirements. It can complete the machining of five faces and holes in one clamping, or even more. In turning, a CNC horizontal lathe and a CNC vertical lathe are equipped. Small products such as end covers and shafts are suitable for turning on the CNC horizontal lathe, and medium and large products such as boxes and brackets are suitable for turning on the CNC vertical lathe. In terms of auxiliary equipment, auxiliary devices such as a hydraulic press, a laser marking machine, and a marble inspection platform are equipped. In summary, the functions of this machining system are complete, can meet the requirements of various processes, can directly submit finished products, and not only have integrity but also flexibility.

[0079] A horizontal machining center fixture is provided on the first horizontal machining center 8 and / or the second horizontal machining center 18. As Figures 21-24 shown, the horizontal machining center fixture includes: a bottom plate 801, a vertical plate 802, a centering disc 804, an angular positioning seat 805, a push beam 806, a lower support seat 807, a right support seat 808, a lever clamping cylinder 809, a push clamping cylinder 810, a support cylinder 811, a steel ball bolt 818, and a quick clamp 819.

[0080] The bottom plate 801 is installed on the first horizontal machining center 8; a vertical plate 802 is arranged on the bottom plate 801, and a through hole is arranged in the middle of the vertical plate 802; two gusset plates 803 are arranged on the back of the vertical plate 802. The bottom plate 801, the vertical plate 802 and the gusset plates 803 are connected and fixed by hexagon socket head cap screws and cylindrical pins. This is the main body of the fixture for the horizontal machining center, and all of them adopt thickened design. Especially the use of large gusset plates 803 has sufficient rigidity to ensure the smooth machining of the housing.

[0081] The centering disc 804 is installed on the through hole of the vertical plate 802; the centering disc 804 has an inner hole, and the inner hole of the centering disc 804 is adapted to the convex stop 101 of the housing 1. The centering disc 804 plays a key centering role. Its outer circle and the middle hole of the vertical plate 802 are accurately positioned, and its inner hole and the outer stop 101 of the housing 1 are accurately positioned. It is made of alloy tool steel and has high wear resistance, which can maintain high-precision positioning for a long time and provides guarantee for the machining of high-precision housings. The centering disc 804 and the vertical plate 802 are both designed with targeted hollowing to effectively avoid interference when machining the convex end mounting holes.

[0082] An angular positioning seat 805, a lower support seat 807 and a right support seat 808 are respectively arranged on the bottom plate 801; a steel ball bolt 818 is arranged on the top of the angular positioning seat 805; the steel ball bolt 818 can automatically and slightly rotate to adjust and contact the positioning surface of the outer peripheral block 106 of the housing 1, and the positioning is more accurate. The steel ball bolt 18 is screwed on the top of the angular positioning seat 805, and the exposed length can be adjusted arbitrarily according to needs, so that the positioning has great flexibility. After adjustment, tighten the lock nut to make the positioning more reliable.

[0083] A first support cylinder 811 is arranged on the top of the lower support seat 807; a second support cylinder 820 is arranged on the inner side of the right support seat 808; a push beam 806 is arranged on the upper part of the vertical plate 802; a push clamping cylinder 810 and a third support cylinder 821 are arranged on the bottom surface of the push beam 806; a push clamping cylinder 810 is arranged at the lower left part of the push beam 806, and the push clamping cylinder 810 and the steel ball bolt 818 are on the same vertical axis. After clamping, the housing 1 has accurate angular positioning and reliable clamping.

[0084] Quick clamps 819 and a plurality of lever clamping cylinders 809 are arranged around the centering disc 804 on the vertical plate 802. In this embodiment, four clamping points are arranged around the centering disc 804, and the four lever clamping cylinders 9 play the role of main clamping. The front end of the pressing plate of the lever clamping cylinder 809 is chamfered to avoid interference when machining the mounting holes.

[0085] The wall thickness of the inclined hole inside the shell 1 is relatively thin, and the shell 1 is prone to deformation and vibration during processing. For this reason, floating supports are designed at the corresponding peripheral parts. The first support cylinder 811 is set on the lower support seat 807, the second support cylinder 820 is set on the right support seat 808, and the third support cylinder 821 is set in the middle of the pushing beam 806. When the shell product is clamped, the three support cylinders will operate to support the outer periphery of the shell 1. In this way, the shell will not be deformed during processing, which makes the processing smooth and improves the processing accuracy.

[0086] The bottom plate 801 is provided with a reversing valve 814, a connector 815 and an accumulator 817 respectively; the accumulator 817 is located on the back of the vertical plate 802; the connector 815 is connected to the reversing valve 814 by pipeline, and the reversing valve 814 is connected to the push-type clamping cylinder 810 by pipeline.

[0087] A pressure gauge 816 is provided on the vertical plate 802; a first sequence valve 812 and a second sequence valve 813 are provided on the back of the vertical plate 802; the first sequence valve 812 is connected to the reversing valve 814 by pipeline; the first sequence valve 812 is connected to the plurality of lever clamping cylinders 809 by pipeline; the second sequence valve 813 is connected to the first sequence valve 812 by pipeline; the second sequence valve 813 is connected to the first supporting cylinder 811, the second supporting cylinder 820 and the third supporting cylinder 821 by pipeline.

[0088] When the horizontal machining center fixture is in use, place the excavator shell 1 horizontally, with the convex end facing the fixture, the side boss to be processed facing right, and move toward the centering plate 804 on the fixture. Move slowly and pay attention to leaving a safe gap with the parts on the fixture to avoid collisions, until the convex stop on the product is accurately positioned with the positioning hole on the centering plate 804. Turn the shell 1 so that the positioning surface of the peripheral block 106 of the side boss contacts and positions the steel ball bolt 818 on the angular positioning seat 805. At this time, immediately pull the quick clamp 819 to pre-clamp the shell 1 to ensure that the shell 1 will not move in the fixture and maintain accurate positioning, while also preventing the product from falling and causing safety accidents.

[0089] Then connect the oil pipe of the hydraulic station to the joint 815 of the fixture, unscrew the reversing valve 814, supply hydraulic oil, first push the push clamping cylinder 810 on the crossbeam 806 to complete the angular clamping; then the first sequence valve 812 is opened, the four lever clamping cylinders 809 are actuated, the shell product is firmly clamped on the centering plate 804, and the main clamping of the shell 1 is completed; then the second sequence valve 13 is opened, the first support cylinder 811, the second support cylinder 820, and the third support cylinder 821 are actuated to complete the floating clamping of the outer periphery of the shell 1, and the positioning and clamping of the shell 1 in the horizontal machining center fixture is completed. Loosen the quick clamp 819 and pull it to the bottom to prevent the clamp from loosening during processing and interfering with the processing.

[0090] Close the reversing valve 814, unplug the oil pipe of the hydraulic station, and confirm the positioning points and clamping points of the housing product again. After ensuring they are correct, start machining the housing 1.

[0091] After the machining is completed, connect the oil pipe of the hydraulic station to the joint 815 of the fixture again, open the reversing valve 814 to drain the hydraulic oil. Each hydraulic cylinder starts to move and retracts to the initial position. Close the reversing valve 814 and unplug the oil pipe of the hydraulic station. Use compressed air or the like to remove waste chips, waste liquid, etc. remaining on the fixture and the product, and then slowly take out the housing product.

[0092] When machining the next housing product, repeat the above steps.

[0093] The housing 1 is placed horizontally in the fixture of the horizontal machining center so that the convex end mounting holes 105, concave end mounting holes 110, the surfaces and holes of the outer peripheral block 106, and the inner cavity inclined holes 111 of the housing 1 can be machined in one clamping.

[0094] The first horizontal machining center 8 and / or the second horizontal machining center 18 are equipped with special milling cutters such as a face milling cutter 9, an internal hole milling cutter 10, a side groove milling cutter 13, and a faceplate 14, realizing efficient milling machining of the inner cavity inclined holes 111 of the housing 1 of the excavator. The faceplate 14 has a numerical control function for root clearing of the hole bottom root 114.

[0095] For the face milling cutter 9, a small-diameter indexable face milling cutter is used for machining the bottom surface of the inner cavity inclined hole 111, and the machining is carried out by circular interpolation. The bottom surface of the inner cavity inclined hole 111 is in a circular ring shape, and the diameter of the face milling cutter is larger than the width of the circular ring. When milling the surface, the circular ring can be machined in one cut. In addition, the face milling cutter 9 uses a special 85° parallelogram insert with high hardness and high wear resistance. It has advantages such as a large rake angle, high cutting efficiency, and a large nose radius, resulting in a high surface roughness of the milled surface. Using this face milling cutter 9 can quickly machine the high-quality bottom surface of the inner cavity inclined hole 111.

[0096] For the internal hole milling cutter 10, the inner cavity inclined holes 111 of the housing 1 are divided into two categories: internal holes with general tolerances and internal holes with strict tolerances. For the internal holes with general tolerances, a welded carbide milling cutter is used, and the insert is made of tungsten steel. It has high hardness, can machine with a large cutting amount, and has very high wear resistance, that is, it has a very long service life, thus greatly reducing the auxiliary cost of frequent tool replacement.

[0097] For the inner hole with strict tolerance, two tools, namely the rough milling cutter 11 and the finish milling cutter 12 for inner hole with machine clamping, are used for machining. They also adopt special 85° parallelogram inserts with high hardness and high wear resistance, and a large number of inserts are installed. In this way, the milling process will be more stable, and the machined inner hole has higher machining accuracies such as cylindricity and coaxiality, which can well ensure the dimensional requirements of the inner hole with strict tolerance. The milling of the above inner hole cutters also adopts the circular interpolation method, which makes it universal. One milling cutter can mill the inner cavity inclined holes 111 of various specifications of the housing 1, greatly reducing the tool cost.

[0098] For the side groove milling cutter 13, the groove 113 on the side of the inner cavity inclined hole 111 is very difficult to machine. It is composed of four disconnected arcs. The milling process of it belongs to interrupted cutting, and the impact on the milling cutter during interrupted cutting will be very large, resulting in unstable milling, and ultimately unable to meet the dimensional requirements of the side groove, and the machining efficiency will be reduced. In addition, root clearing is required at the end of the groove 113, which brings great difficulties to milling. Therefore, a formed side groove milling cutter 13 is designed. The shape of the cutting part of the insert used by it is the same as the shape of the side groove, and it is directly machined and formed. This formed side groove milling cutter 13 also adopts a welded carbide milling cutter, and the insert also adopts tungsten steel material, so it fully has the advantages mentioned above. In addition, the number of inserts is increased, which greatly improves the cutting stability, well solves the problem of interrupted cutting, and can not only meet the dimensional requirements of the side groove, but also improve the machining efficiency.

[0099] The faceplate 114 mainly consists of a tool shank, a servo motor and its fixed seat, a transmission mechanism, tools, etc. For the housing 1 mentioned in the present invention, a medium and small-sized numerical control faceplate is selected. Its tool shank is inserted into the spindle hole of the horizontal machining center, and is accurately positioned and clamped. The fixed seat of the servo motor is installed on the fixed seat of the horizontal machining center spindle, and a servo motor is installed at the other end. The power supply and control cables of the servo motor are connected to the numerical control system of the horizontal machining center, so that the numerical control faceplate and other moving axes of the horizontal machining center can be linked to machine the housing 1. The transmission mechanism mainly consists of a motor drive shaft, a drive shaft gear, various bevel gears, a drive gear, a rack, etc. Through multiple effective transmissions, the rotational motion of the faceplate servo motor is finally converted into the radial motion of the tool, and through the linkage with other moving axes of the horizontal machining center, the root clearing of the bottom root 114 of the housing hole is completed. By using the faceplate 14, the milling root clearing completely replaces the previous turning root clearing, which is the most crucial point for improving the process of the housing 1.

[0100] In order to reduce the moving distance of operators between workstations, traditional processing systems arrange various equipment closely, which makes the working area narrow. Although the walking distance is reduced, many potential safety hazards are increased. A flexible processing system of the present invention further includes: multiple AGV automatic transfer vehicles 4. The present invention is equipped with multiple AGV automatic transfer vehicles 4, and operators can control them at any position. Through the mutual assistance of operators, the problem of large walking distance is effectively solved. The transfer of products, tools, etc. is all automatically completed, which not only greatly reduces the labor intensity, but also significantly shortens the transfer working hours, indirectly improving the processing efficiency of products. The use of AGV automatic transfer vehicle 1 makes the transfer of processed products, etc. in this system all become automatic operations, which enables the placement of various equipment not to be arranged closely in order to reduce the walking distance of operators. More importantly, it greatly reduces the labor intensity of operators. Through the mutual assistance of operators within the system, they can operate nearby and do not need to follow the products to move within the entire system area, which significantly reduces the walking distance and also reduces various waiting wastes such as transfer, loading and unloading of processed products. Multiple products can be processed simultaneously in this flexible processing system, and multiple AGV automatic transfer vehicles 4 can be configured according to specific situations to achieve the optimization of the handling process and eliminate transfer waiting.

[0101] A workbench is equipped in the operation area of each piece of equipment. The workbench mainly has two layers. The upper layer can place processed products, and there are enclosures around the edges to prevent them from falling during the transfer process. The lower layer can place tools, consumables, etc. When transfer is required, the operator calls the AGV automatic transfer vehicle 4, which will enter the space under the workbench. The lifting tray of the AGV automatic transfer vehicle 4 contacts the bottom surface of the lower layer and lifts the workbench, and then transfers the workbench together with the processed products, etc. to the next operation station, and then the nearby operator will operate it. The AGV automatic transfer vehicle 4 has an obstacle detection function. When an obstacle is detected within the set distance, it will automatically stop or re-plan the transfer route until the workbench is sent to the designated station, which can provide safety guarantee for the entire transfer process. Through the use of the AGV automatic transfer vehicle 4, the transfer route can be arbitrarily designed according to the needs of the processing technology, which is flexible and reliable.

[0102] When the flexible processing system of the present invention is working, generally, two operators are configured for each shift. The area outside the equipment serves as a buffer zone, where materials such as blanks, semi-finished products, finished products, consumables, and tools can be placed and flexibly planned according to needs. The equipment of the present invention is complete in variety and powerful in function.

[0103] The flexible machining system of the present invention has the following specific machining process for machining the housing 1 of an excavator: the first CNC vertical lathe 2 - transfer - the second CNC vertical lathe 3 - transfer - the first horizontal machining center 8 - transfer - the first press 15 - transfer - the first laser marking machine 16 - the first marble inspection platform 17. After that, the qualified products are put into the finished product warehouse, and the unqualified products are transferred to the unqualified product area.

[0104] The present invention provides a housing machining method, including the following processes:

[0105] Step 1: First, transfer the excavator housing product from the blank warehouse to the first CNC vertical lathe 2. Then, clamp the blank of the housing 1 onto the fixture already installed on the workbench of the first CNC vertical lathe 2, with the convex end of the housing 1 facing upward. First, machine the convex stop 101, convex end inner hole 102, convex end seal groove 103, etc. After machining, unload the product, remove the burrs, and place it on the workbench of the first CNC vertical lathe 2. Then, the operator controls the AGV automatic transfer vehicle 4 to automatically transfer the product to the next second CNC vertical lathe 3.

[0106] Step 2: Clamp the housing 1 onto the fixture already installed on the workbench of the second CNC vertical lathe 3, with the concave end 6 of the housing product facing upward. Use the machined convex stop 101 to position and clamp with the fixture. Then, machine the concave end positioning hole 108 and the concave end seal groove 107. After machining, unload the product, remove the burrs, handle it gently to avoid causing bad defects such as bumps and scratches to the housing 1, and place it on the workbench of this station. Then, the operator controls the AGV automatic transfer vehicle 4 to automatically transfer the product to the first horizontal machining center 8.

[0107] Step 3: Clamp the housing 1 onto the horizontal machining center fixture already installed on the workbench of the first horizontal machining center 8, place the housing 1 horizontally, with the concave end facing the spindle end of the first horizontal machining center. Still use the machined convex stop 101 to position and clamp with the fixture. Then, machine the convex end mounting hole 105, the concave end mounting hole 110, and the surfaces and holes of the outer peripheral block 106.

[0108] Step 4: Machine the inner cavity inclined hole 111. First, install the face milling cutter 9 on the spindle of the first horizontal machining center 8, and machine the bottom surface of the inner cavity inclined hole 111 by means of circular interpolation milling. Machine it in three passes axially. The first two passes are rough machining, with the machining allowance between 2 mm and 3 mm, and the last pass is finish machining, with the machining allowance between 0.1 mm and 0.2 mm. After that, install the internal hole milling cutter 10 on the spindle of the first horizontal machining center 8, and also machine multiple general tolerance internal holes by means of circular interpolation milling. Then install the internal hole indexable rough milling cutter 11 on the spindle of the first horizontal machining center 8, rough mill the strict tolerance internal holes, and then replace it with the internal hole indexable finish milling cutter 12 to finish mill the strict tolerance internal holes. Subsequently, install the side groove milling cutter 13 on the spindle of the first horizontal machining center 8. Since the lateral depth of the groove on the inner cavity side is large and cannot be machined in one pass, perform multiple rough machinings laterally, with the machining allowance between 0.8 mm and 1.5 mm, and generally only one finish machining is required, with the machining allowance controlled between 0.05 mm and 0.1 mm. However, when there are defects such as ripples after machining the bottom surface of the side groove 113, additional finish machining is required to repair the above defects. After using the above-mentioned milling cutters, the milling cutters will be transferred into the tool magazine by the robotic arm of the first horizontal machining center 8, and will also be quickly retrieved by the robotic arm when used next time.

[0109] Step 5: Install the rotary table 14 on the spindle of the first horizontal machining center 8, control the rotary table 14 to move to the center coordinates of the X-axis and Y-axis of the inner cavity inclined hole 111, rotate the spindle forward, and then the numerical control system controls the movement of each axis until the starting point of the inner bevel of the hole bottom root 114 moves to the tip of the rotary table 14. At this time, the numerical control system will start the servo motor of the rotary table 14, and drive the tip to move outward through the transmission mechanism inside the rotary table 14. At the same time, the housing 1 moves along the Z-axis towards the spindle end, and stops moving in the Z-axis direction after reaching the axial depth of the hole bottom root 114. Through the linkage of the two, the machining of the inner bevel of the hole bottom root 114 is completed; then the tip of the rotary table 14 continues to move outward and stops moving after reaching the radial depth of the hole bottom root 114. At this point, the machining of the chamfering of the outer side of the hole bottom root 104 is completed. Then retract the tool and transfer the rotary table 14 into the tool magazine for direct retrieval during the next machining. At this point, the main machining process of the housing 1 of the excavator is completed. After that, the operator unloads the machined housing, and then controls the AGV automatic transfer vehicle 4 to automatically transfer the housing 1 to the first press 15.

[0110] Step 6: Install the housing 1 onto the fixture already installed on the workbench of the first pound press 15. Start each cylinder to seal and clamp the housing 1, and then begin the pound pressing. If the control panel of the first pound press 15 shows that the pound pressing is unqualified, the operator will unload it and control the AGV automatic transfer vehicle 4 to transfer it to the waste area. If it is qualified, the operator will unload it. Since both the first pound press 15 and the first laser marking machine 16 are not only small in size but also placed in close proximity, the operator can directly take the product to the workbench of the first laser marking machine 16, install it on the marking fixture, and perform the marking operation. After the marking is qualified, unload it and control the AGV automatic transfer vehicle 4 to transfer it to the first marble inspection platform 17 for inspection according to the requirements of the product inspection form. After passing the inspection, transfer it to the finished product area; if unqualified, transfer it to the waste area. Thus, all processes are completed according to the process requirements of the housing 1 of the excavator.

[0111] When reprocessing the housing 1 of the excavator, repeat the above steps 1 to 6.

[0112] The flexible processing system of the present invention can meet Figures 1-4 the process requirements of the housing 1 of the excavator as shown; at the same time, it can also meet the processing requirements of other small housing products, medium and large housing products, end cover types, shaft types of products, etc.

[0113] a) Small housing products: There are surfaces and holes on the outside that need to be processed, whether in one rotational direction or multiple rotational directions. The main processing technology of such excavator housing products in this flexible processing system is: CNC horizontal lathe - CNC horizontal lathe - five-axis vertical machining center. The CNC horizontal lathe is very suitable for processing small parts. The five-axis vertical machining center is not only suitable for medium and small parts but also can complete the processing of the external surface and holes at one time. Such a processing technology is convenient to operate and has high efficiency.

[0114] b) Medium and large housing products: There are surfaces and holes on the outside that need to be processed, all in one rotational direction. The main processing technology of such excavator housing products in this flexible processing system is: CNC vertical lathe - CNC vertical lathe - horizontal machining center. The housing dealt with in the present invention belongs to this type of product. If the external surfaces and holes are in multiple rotational directions, its main processing technology is CNC vertical lathe - CNC vertical lathe - five-axis vertical machining center.

[0115] c) In addition to excavator housing products, it can also deal with other products. For example, the processing technology of end cover types and shaft types of products in this flexible processing system is: CNC horizontal lathe - CNC horizontal lathe - vertical machining center. The processing technology of box types and bracket types of products in this flexible processing system is: CNC vertical lathe - CNC vertical lathe - horizontal machining center or five-axis vertical machining center, etc.

[0116] In summary, this flexible machining system can meet the machining process requirements of the vast majority of product types, and can complete machining with the optimal machining process, being efficient, stable and reliable, resulting in high-precision and low-cost machined products with strong competitiveness.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: modifying the technical solutions recorded in the foregoing embodiments, or equivalently replacing some or all of the technical features therein, does not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A flexible processing system, characterized in that: include: A first CNC vertical lathe (2), a second CNC vertical lathe (3), a first horizontal machining center (8), a first pound press (15) and a first laser marking machine (16); The first horizontal machining center (8) is equipped with a face milling cutter (9), an inner hole milling cutter (10), a side slot milling cutter (13) and a horizontal rotary disc (14); A horizontal machining center fixture is arranged on the first horizontal machining center (8); The horizontal machining center fixture comprises: a base plate (801), a vertical plate (802), a centering plate (804), an angular positioning seat (805), a pushing beam (806), a lower support seat (807), a right support seat (808), a lever clamping cylinder (809), a push clamping cylinder (810), a first support cylinder (811), a second support cylinder (820), a steel ball bolt (818), and a quick clamp (819); The bottom plate (801) is mounted on a first horizontal machining center (8); a vertical plate (802) is arranged on the bottom plate (801), and a through hole is arranged in the middle of the vertical plate (802); the centering plate (804) is mounted on the through hole of the vertical plate (802); the centering plate (804) has an inner hole; An angular positioning seat (805), a lower support seat (807), and a right support seat (808) are respectively arranged on the bottom plate (801); a steel ball bolt (818) is arranged on the top of the angular positioning seat (805); A first supporting cylinder (811) is disposed on the top of the lower supporting seat (807); A second supporting cylinder (820) is disposed on the inner side of the right supporting seat (808); A pushing crossbeam (806) is disposed on the upper portion of the vertical plate (802); a push-type clamping cylinder (810) and a third supporting cylinder (821) are disposed on the bottom surface of the pushing crossbeam (806); the pushing clamping cylinder (810) and the steel ball bolt (818) are on the same vertical axis; The vertical plate (802) is provided with a quick clamp (819) and a plurality of lever clamping cylinders (809) around the centering disk (804).

2. A flexible processing system according to claim 1, characterized in that: Also includes: A first marble detection platform (17) and a second marble detection platform (22).

3. A flexible processing system according to claim 1, characterized in that: Also includes: One or more of a third CNC vertical lathe (5), a CNC horizontal lathe (6), a first vertical machining center (7), a second horizontal machining center (18), a second vertical machining center (19), a second pound press (20), and a second laser marking machine (21).

4. A flexible processing system according to claim 3, characterized in that: The second vertical machining center (19) is a five-axis vertical machining center.

5. A flexible processing system according to claim 1, characterized in that: Also includes: Multiple AGV automatic transfer vehicles (4).

6. A flexible processing system according to claim 1, characterized in that: Also includes: Multiple chip removal vehicles.

7. A flexible processing system according to claim 1, characterized in that: Two corner plates (803) are arranged on the back side of the vertical plate (802).

8. A flexible processing system according to claim 7, characterized in that: A reversing valve (814), a connector (815) and an accumulator (817) are respectively arranged on the bottom plate (801); The energy accumulator (817) is located on the back side of the vertical plate (802); The connector (815) is connected to the pipeline of the reversing valve (814), and the reversing valve (814) is connected to the pipeline of the push-type clamping cylinder (810).

9. A flexible processing system according to claim 8, characterized in that: A pressure gauge (816) is provided on the vertical plate (802); A first sequence valve (812) and a second sequence valve (813) are provided on the back side of the vertical plate (802); The first sequence valve (812) is connected to the reversing valve (814) through a pipeline; the first sequence valve (812) is connected to the plurality of lever clamping cylinders (809) through pipelines; The second sequence valve (813) is connected to the first sequence valve (812) via a pipeline; the second sequence valve (813) is connected to the first support cylinder (811), the second support cylinder (820), and the third support cylinder (821) via a pipeline.

10. A shell processing method of a flexible processing system according to any one of claims 1 to 9, characterized in that: The process includes: Step 1, firstly, the shell (1) of the excavator is transferred from the blank warehouse to the first CNC vertical lathe (2), then the blank of the shell (1) is clamped on the fixture installed on the workbench of the first CNC vertical lathe (2), and the convex end of the shell (1) is facing upward, and the convex stop (101), the convex end inner hole (102), and the convex end sealing groove (103) are first turned; after processing, the product is unloaded and placed on the workbench of the first CNC vertical lathe (2), and then the operator controls the AGV automatic transfer vehicle (4) to automatically transfer the product to the second CNC vertical lathe (3); Step 2, the housing 1 is clamped onto a fixture installed on the workbench of the second CNC vertical lathe (3), the concave end (6) of the housing product is facing upward, and the concave end (6) is positioned and clamped with the processed convex stop (101), and then the concave end positioning hole (108) and the concave end sealing groove (107) are turned; after processing, the product is unloaded and placed on the workbench of this station, and then the operator controls the AGV automatic transfer vehicle (4) to automatically transfer the product to the first horizontal machining center (8); Step 3, clamping the housing (1) to a horizontal machining center fixture installed on a workbench of a first horizontal machining center (8), placing the housing (1) horizontally with the concave end facing the spindle end of the first horizontal machining center, still using the processed convex stop (101) and the fixture to position and clamp, and then processing the convex end mounting hole (105), the concave end mounting hole (110) and the surface and hole of the peripheral block (106); Step 4, machining the inner cavity inclined hole (111), installing the face milling cutter (9) on the spindle of the first horizontal machining center (8), and machining the bottom surface of the inner cavity inclined hole (111) by using the circular arc interpolation milling method, and machining is performed three times in the axial direction, the first two times are rough machining, the machining amount is between 2mm and 3mm, and the last time is fine machining, the machining amount is between 0.1mm and 0.2mm; installing the inner hole milling cutter (10) on the spindle of the first horizontal machining center (8), and also using the circular interpolation milling method. Milling multiple general tolerance internal holes by arc interpolation milling method; installing an internal hole machine clamp rough milling cutter (11) on the spindle of the first horizontal machining center (8) to perform rough milling on the strict tolerance internal hole, and then replacing it with an internal hole machine clamp fine milling cutter (12) to perform fine milling on the strict tolerance internal hole; installing a side slot milling cutter (13) on the spindle of the first horizontal machining center (8) to perform multiple rough machining in the side direction, with the machining amount between 0.8 mm and 1.5 mm, and the machining amount is controlled between 0.05 mm and 0.1 mm; Step 5, install the flat rotary disk (14) on the spindle of the first horizontal machining center (8), control the flat rotary disk (14) to move to the center coordinates of the X-axis and Y-axis of the inner cavity inclined hole (111), rotate the spindle forward, and then the numerical control system controls each axis to move until the starting point of the inner bevel angle of the hole bottom root (114) moves to the tool tip of the flat rotary disk (14). At this time, the numerical control system will start the servo motor of the flat rotary disk (14), and drive the tool tip to move outward through the transmission mechanism inside the flat rotary disk (14). At the same time, the housing (1) moves along the Z-axis to the spindle end to reach the hole bottom root (114). After reaching the axial depth of the hole bottom (114), the movement in the Z-axis direction is stopped, and the inner bevel processing of the hole bottom root (114) is completed through the linkage of the two; then the tool tip of the flat rotary disk (14) continues to move outward, and stops moving after reaching the radial depth of the hole bottom root (114), completing the root cleaning processing of the outer side of the hole bottom root (104), and then retracts the tool and transfers the flat rotary disk (14) into the tool library for direct call during the next processing; the operator unloads the processed shell, and then controls the AGV automatic transfer vehicle (4) to automatically transfer the shell (1) to the first pound press (15); Step 6, install the shell (1) on the fixture installed on the workbench of the first pound press (15), start each cylinder, seal and clamp the shell (1), and then start pound pressing. If the control panel of the first pound press (15) shows that the pound pressing is unqualified, the operator removes it and controls the AGV automatic transfer vehicle (4) to transfer it to the waste area; if it is qualified, the operator removes it; When the housing (1) of the excavator is processed again, the above steps 1 to 6 are repeated.

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