A special machine for milling end face and drilling center hole with automatic adjustment of cross shaft eccentricity

Abstract

The utility model discloses a special machine for milling end faces and drilling center holes that can automatically adjust the eccentricity of a cross shaft, and relates to the field of eccentric cross shaft processing, including a bed, a Z-axis slide saddle, an L-shaped tooling connector, a turntable and a tooling fixture assembly. During processing, the turntable is used to drive the workpiece to switch between a first processing posture and a second processing posture, and at the same time, the Z-axis slide saddle is used to drive the workpiece to move forward and backward along the Z-axis direction to achieve eccentricity adjustment. The utility model solves the problem of adjusting different eccentricities of various models and switching between high and low axis center lines during processing, which is changed from manual operation to automatic processing by the machine according to a set program, so that model replacement is simplified from complicated, and operation is changed from heavy to easy, eliminating product symmetry and end face runout tolerance, canceling the two correction processes of rough turning of axle necks and soft grinding of end faces, reducing the corresponding personnel configuration, shortening the product production cycle, and improving production efficiency, and changing from manual operation by one person on a single machine to automatic operation by one person on four machines.

Description

Technical Field

[0001] The utility model relates to the field of eccentric cross shaft processing, in particular to a special machine for milling end faces and drilling center holes which can automatically adjust the eccentricity of the cross shaft. Background Art

[0002] Eccentric cross shaft (such as Figure 3 , 4 ) and conventional cross shaft (as shown Figure 1 , 2 ) is that there is an eccentricity value t between one axis and the other axis. Due to the special product structure, the eccentricity distance varies (generally there are different specifications such as 4mm, 5mm, 6mm, 6.5mm, 7mm, 7.5mm, 7.9mm, 8mm, 8.5mm, 9mm, 10mm, etc.).

[0003] At present, when processing the cross shaft on a special machine for splitting and drilling center holes with dual power heads, in order to achieve the consistency between the center eccentricity value of the center line of the two power head spindles and the eccentricity t between the two axis lines of the cross shaft, one of the power heads needs to be raised, and the power head is lifted by a manual hoist. A gasket with a thickness of the eccentricity t is placed on the base, and the center height of the two power heads is corrected to the left and right with a core rod so that the height difference between the two power heads meets the eccentricity t requirement of the product. The eccentric cross shaft is horizontally placed in a V-shaped positioning block with an eccentricity t between the two axis lines, and the processing is carried out by manually rotating the rotating platform on which the V-shaped positioning block is fixed.

[0004] During processing, after identifying the direction of the workpiece, place the workpiece in the V-shaped positioning block, tighten the clamping screw manually, and adjust the stroke limit switch and dead stop iron at the low end of the center line of the power head spindle until the tool cannot touch the cross axis. Then, adjust the stroke limit switch and dead stop iron at the high end of the center line of the power head spindle until the tool can process the cross axis. The first rotating platform rotates the high end of the cross axis axis to the high end of the center line of the power head spindle, pulls the protective plate to close, starts the special machine, and the high and low power heads are pushed forward in the direction of the cross axis by the oil cylinder pressure, and turn into working feed when the working feed switch is pressed. The power head at the low end cannot contact the cross axis due to the limitation of the stroke limit switch and the dead stop iron. At this time, the power head at the high end starts to mill the end face and drill the center hole to realize the processing of a high-position shaft head of the cross axis. After the high and low power heads press the return stroke limit switch, they quickly return to the two ends of the guide rail and stop. At this time, the operator moves the positioning pin of the rotating platform with his left hand and turns the rotating handle with his right hand to perform the rotating operation. When the first positioning hole is cored, the platform has rotated 90°. When the second positioning hole is cored, there is a click sound. At this time, release the right hand in time to allow the positioning pin to be steadily inserted into the positioning hole. At this time, the platform has rotated 180°. Start the special machine, and the power head repeats the above processing again to achieve the processing of another high-position shaft head of the cross axis. After the high and low power heads return to both ends of the guide rail and stop, pull open the protective plate and adjust the travel limit switch and dead stop iron at the high end of the power head spindle center line until the tool cannot touch the cross axis. After that, adjust the travel limit switch and dead stop iron at the low end of the power head spindle center line until the tool can process the cross axis. The operator moves the rotating platform positioning pin with his left hand and turns the rotating handle with his right hand to perform the rotating operation. When the first positioning hole is cored, there is a click sound. Release the right hand in time to allow the positioning pin to be steadily inserted into the positioning hole. At this time, the platform has rotated 90°, the protective plate is closed, and the special machine is started. The high and low power heads are pushed forward in the direction of the cross axis by the pressure of the oil cylinder, and they become working forward when they are pressed to the working feed switch. The power head at the high end cannot contact the cross axis due to the limitation of the stroke limit switch and the dead stop iron. At this time, the power head at the bottom end starts to mill the end face and drill the center hole to realize the processing of a bottom axis head of the cross axis. After the high and low power heads are pressed to the return stroke limit switch, they quickly return to the two ends of the guide rail and stop. At this time, the operator moves the locating pin of the rotating platform with his left hand and turns the rotating handle with his right hand to perform the rotating operation. When the first positioning hole is cored, the platform has rotated 90°. When the second positioning hole is cored, there is a click sound, and the right hand is released in time to allow the locating pin to be steadily inserted into the positioning hole. At this time, the platform has rotated 180°, and the special machine is started. The power head repeats the above processing again to realize the processing of the other low-position shaft head of the cross shaft; after the high and low power heads return to the two ends of the guide rail and stop, loosen the clamping screw with both hands, pull open the protective plate, take out the cross shaft from the V-shaped positioning block, and pass the inspection according to the requirements of the drawing. At this time, the processing of an eccentric cross shaft workpiece is completed.

[0005] However, the existing technology has the following defects: the cycle time of a single piece is 120 seconds. During actual processing, the adjustment of equipment and tooling is complicated. This adjustment process requires experienced full-time mechanics to spend a week to achieve perfect results; since the eccentricity of each product is different, each replacement requires repeated adjustment; the operation of workers is complicated and labor-intensive. If the wrong direction is turned during operation, it will be scrapped, and there are serious quality risks that cannot be effectively eliminated; the product turnover time is long and the production efficiency is low. One person manually operates a single machine. Due to the large symmetry and runout of the end face of the eccentric cross shaft after processing, two processes of rough turning the axle neck and soft grinding the end face are required for correction. Utility Model Content

[0006] The purpose of the utility model is to overcome the deficiencies in the prior art and to provide a special machine for milling end faces and drilling center holes that can automatically adjust the eccentricity of a cross shaft, to thoroughly solve the adjustment of different eccentricities of various models and the switching of high and low axis centerline processing from manual operation to automatic processing by the machine according to a set program, to achieve a change from complicated to simplified model replacement, from heavy to easy operation, to eliminate product symmetry and end face runout tolerances, to cancel the two correction processes of rough turning of the axle neck and soft grinding of the end face, to reduce the corresponding personnel allocation, to shorten the product production cycle, to improve production efficiency, and to change from manual operation of a single machine by one person to automatic operation of four machines by one person.

[0007] The purpose of the utility model is to achieve the following technical solution: This cross-axis eccentricity-adjustable milling end face drilling center hole special machine includes a bed, a Z-axis slide saddle, an L-shaped tooling connector, a rotary table and a tooling fixture assembly,

[0008] A Z-axis saddle is provided in the middle of the bed through a Z-axis sliding assembly for sliding along the Z-axis direction, the Z-axis direction is perpendicular to the upper surface of the bed, the bottom surface of the L-shaped tooling connector is fixed on the Z-axis saddle, and a turntable is fixedly installed on the vertical surface of the L-shaped tooling connector; the bottom plate of the tooling fixture assembly is connected to the turntable, an eccentric positioning block is positioned and installed on the turntable, the workpiece to be processed is clamped and positioned on the eccentric positioning block by the tooling fixture assembly, and the plane where the workpiece is located is perpendicular to the Z-axis direction;

[0009] A left slide plate is set on the left side of the Z-axis slide saddle by sliding along the X-axis direction through an X-axis slide assembly, and a right slide plate is set on the right side of the Z-axis slide saddle by sliding along the Y-axis direction through a Y-axis slide assembly. The X-axis and Y-axis directions are opposite and on the same axis, and both are perpendicular to the Z-axis, so that the left spindle box installed on the left slide plate and the right spindle box installed on the right slide plate are symmetrically distributed on the left and right sides of the Z-axis slide saddle. A tool body is set on the side close to the workpiece on the left spindle box and the right spindle box for processing the end face of the workpiece;

[0010] During processing, the turntable is used to drive the workpiece to switch between the first processing posture and the second processing posture, and the Z-axis saddle is used to drive the workpiece to move back and forth along the Z-axis direction to achieve eccentricity adjustment.

[0011] As a further technical solution, in the first machining posture, the first axial end surface of the workpiece faces the tool body of the left spindle box, and the third axial end surface of the workpiece faces the tool body of the right spindle box.

[0012] As a further technical solution, in the second machining posture, the fourth axis end surface of the workpiece faces the tool body of the left spindle box, and the second axis end surface of the workpiece faces the tool body of the right spindle box.

[0013] As a further technical solution, the Z-axis sliding assembly includes a Z-axis servo motor and a Z-axis ball screw driven by the Z-axis servo motor, the Z-axis ball screw is used to drive a slider on the Z-axis guide rail, and the Z-axis saddle is installed on the slider.

[0014] As a further technical solution, the X-axis sliding assembly includes an X-axis servo motor and an X-axis ball screw driven by the X-axis servo motor, the X-axis ball screw is used to drive a slider on the X-axis guide rail, and the left slider is installed on the slider.

[0015] As a further technical solution, the Y-axis sliding assembly includes a Y-axis servo motor and a Y-axis ball screw driven by the Y-axis servo motor. The Y-axis ball screw is used to drive a slider on the Y-axis guide rail, and the right slider is installed on the slider.

[0016] As a further technical solution, a turntable connecting plate and a pad are arranged between the eccentric positioning block and the turntable in sequence, one end of the positioning pin extends into the positioning pin hole at the bottom of the eccentric positioning block, and the other end of the positioning pin passes through the turntable connecting plate and the pad in sequence and then extends into the turntable, so as to coaxially position the eccentric positioning block and the turntable.

[0017] As a further technical solution, the tooling fixture assembly includes a cylinder, a cylinder connecting plate is provided on the side of the cylinder facing the workpiece, and the piston rod of the cylinder passes through the cylinder connecting plate and extends toward the workpiece to clamp the workpiece; cylinder support rods are installed on the cylinder connecting plates on both sides of the piston rod, and the other end of the cylinder support rod is used to penetrate into the fixing hole on the eccentric positioning block to tighten the eccentric positioning block.

[0018] As a further technical solution, it also includes a chip conveyor, which is placed behind the bed along the Z-axis direction, a chip accumulation car is provided at the chip conveyor outlet, a water tank is arranged on the left side of the chip conveyor, a hydraulic station is arranged on the left side of the water tank, and an electric box is arranged on the right side of the chip conveyor.

[0019] As a further technical solution, the knife specifically includes a center drill arranged at the center thereof and a blade arranged on the periphery of the center drill.

[0020] The beneficial effects of the utility model are:

[0021] 1. In the background technology, to adjust various eccentricities, a crane must be used to lift one side of the power head with a pneumatic crane, add a gasket on the sliding table (the thickness of the gasket varies according to the eccentricity of different products), use a core rod to align the centers of the two power heads, and then tighten the power head on the sliding table; the utility model only needs to adjust the moving data in the program, the machine tool slide automatically shifts, and the Z-axis sliding assembly and the Z-axis sliding saddle are used to drive the workpiece to move forward and backward, so that the eccentricity can be easily and accurately achieved instantly;

[0022] 2. Background technology The tooling fixture of the V-shaped positioning block is manually rotated 6 times to realize the processing of the shaft head respectively. If the wrong direction is turned carelessly during operation, it will be scrapped. The equipment tooling adjustment is complicated, and the workers' operation is complicated and labor-intensive. The utility model automatically controls the turntable to rotate 90° according to the pre-set program of the machine tool to realize the switching between the first processing posture and the second processing posture, which can realize fast installation. As long as the program is modified, the automatic processing of workpieces of different models (eccentricity) can be realized, which changes the working method of workers;

[0023] 3. The background technology can only be operated manually by one person on a single machine, and the single-piece cycle is 120 seconds; the utility model can realize automatic operation of three machines by one person, and the single-piece cycle is 35 seconds, and the production efficiency is increased by 10.28 times. The original product turnover time is 30 days, and now it can be turned over once every 3 days, shortening the production cycle and speeding up the circulation of products;

[0024] 4. The cross axis (workpiece) is arranged vertically on the middle guide rail (turntable) relative to the bed, and moves relative to the surface composed of the left and right double axes, which changes the layout structure of traditional processing equipment and significantly improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The structure of a conventional cross shaft in the prior art is shown in FIG. Figure 1 .

[0026] Figure 2 The structure of a conventional cross shaft in the prior art is shown in FIG. Figure 2 .

[0027] Figure 3 The structure diagram of the eccentric cross shaft in the prior art is shown in FIG. Figure 1 .

[0028] Figure 4 The structure diagram of the eccentric cross shaft in the prior art is shown in FIG. Figure 2 .

[0029] Figure 5 It is a schematic diagram of the main structure of the utility model.

[0030] Figure 6 for Figure 5 PP cross-sectional view.

[0031] Figure 7 It is a schematic diagram of the top structure of the utility model.

[0032] Figure 8 It is a schematic diagram of the connection structure between the fixture assembly and the turntable in the utility model.

[0033] Fig. 9 This is a schematic diagram of the main structure of the eccentric positioning block in the utility model.

[0034] Fig.10 The structure diagram of the eccentric positioning block and the workpiece after assembly in the utility model Figure 1 .

[0035] Fig.11 The structure diagram of the eccentric positioning block and the workpiece after assembly in the utility model Figure 2 .

[0036] Fig.12 It is a structural schematic diagram of the L-shaped tooling connector in the utility model.

[0037] Fig.13 It is a specific structural schematic diagram of the knife in the utility model.

[0038] Fig.14 It is a schematic diagram of the structure when switching between the first processing posture and the second processing posture during processing of the utility model.

[0039] Description of the accompanying drawings: bed 1, electric box 2, chip conveyor 3, chip accumulation car 4, water tank 5, hydraulic station 6, Z-axis servo motor 7, Z-axis ball screw 8, Z-axis slide saddle 9, X-axis servo motor 10, X-axis ball screw 11, X-axis guide rail 12, left slide 13, Z-axis guide rail 14, right slide 15, Y-axis ball screw 16, Y-axis guide rail 17, Y-axis servo motor 18, left spindle box 19, tool body 20, center drill 20-1, tool Plate 20-1, right spindle box 21, pad 22, L-shaped tooling connector 23, turntable 24, eccentric positioning block 25, positioning pin hole 25-1, fixing hole 25-2, workpiece 26, first axis 26-1, second axis 26-2, third axis 26-3, fourth axis 26-4, tooling fixture assembly 27, positioning pin 28, turntable connecting plate 29, cylinder 30, cylinder connecting plate 31, piston rod 32, cylinder support rod 33. DETAILED DESCRIPTION

[0040] The utility model will be described in detail below with reference to the accompanying drawings:

[0041] Example: As attached Figures 5 to 14As shown, the special machine for milling end face and drilling center hole with automatic adjustment of cross axis eccentricity includes a bed 1, an electric box 2, a chip conveyor 3, a chip accumulation vehicle 4, a water tank 5, a hydraulic station 6, a Z-axis servo motor 7, a Z-axis ball screw 8, a Z-axis saddle 9, an X-axis servo motor 10, an X-axis ball screw 11, an X-axis guide rail 12, a left slide plate 13, a Z-axis guide rail 14, a right slide plate 15, a Y-axis ball screw 16, a Y-axis guide rail 17, a Y-axis servo motor 18, a left spindle box 19, and a tool body 2 0, center drill 20-1, blade 20-1, right spindle box 21, pad 22, L-shaped tooling connector 23, turntable 24, eccentric positioning block 25, positioning pin hole 25-1, fixing hole 25-2, workpiece 26, first axis 26-1, second axis 26-2, third axis 26-3, fourth axis 26-4, tooling fixture assembly 27, positioning pin 28, turntable connecting plate 29, cylinder 30, cylinder connecting plate 31, piston rod 32 and cylinder support rod 33.

[0042] Reference Figure 7 At the middle position of the bed 1, a Z-axis slide saddle 9 is slidably arranged along the Z-axis direction through a Z-axis slide assembly, and the Z-axis direction is perpendicular to the upper surface of the bed 1. Further, the Z-axis slide assembly includes a Z-axis servo motor 7 and a Z-axis ball screw 8, and the Z-axis servo motor 7 drives the Z-axis ball screw 8 and drives a slider on the Z-axis guide rail 14, and the Z-axis slide saddle 9 is installed on the slider.

[0043] like Figure 6 , 12 As shown, the bottom surface of the L-shaped tooling connector 23 is fixed on the Z-axis slide saddle 9, and the turntable 24 is fixedly installed on the vertical surface of the L-shaped tooling connector 23. The bottom plate of the tooling fixture assembly 27 is connected to the turntable 24, and the eccentric positioning block 25 is positioned and installed on the turntable 24. The workpiece 26 to be processed is clamped and positioned on the eccentric positioning block 25 by the tooling fixture assembly 27, and the plane where the workpiece 26 is located is perpendicular to the Z-axis direction. Further, as Figure 8 As shown, a turntable connecting plate 29 and a pad 22 are sequentially arranged between the eccentric positioning block 25 and the turntable 24. Fig. 9 , 10As shown in Figures 11, a positioning pin hole 25-1 is provided at the bottom center of the V-shaped eccentric positioning block 25, and a fixing hole 25-2 is provided at each of the four corners of the eccentric positioning block 25. One end of the positioning pin 28 extends into the positioning pin hole 25-1 at the bottom of the eccentric positioning block 25, and the other end of the positioning pin 28 passes through the turntable connecting plate 29 and the pad 22 in sequence and then extends into the turntable 24, so that the eccentric positioning block 25 and the turntable 24 are coaxially positioned. Further, the jig assembly 27 includes a cylinder 30, and a cylinder connecting plate 31 is provided on the side of the cylinder 30 facing the workpiece 26. The piston rod 32 of the cylinder 30 passes through the cylinder connecting plate 31 and then extends toward the workpiece 26, so as to press the workpiece 26 during the processing. Cylinder support rods 33 are installed on the cylinder connecting plates 31 on both sides of the piston rod 32, and the other end of the cylinder support rod 33 is used to penetrate into the fixing hole 25-2 on the eccentric positioning block 25 to tighten the eccentric positioning block 25. It should be noted that the turntable 24 is a conventional product available on the market, and its internal structure and working principle are well-known prior art, which will not be described in detail here.

[0044] Reference Figure 6 Further, a left slide plate 13 is provided on the left side of the Z-axis slide saddle 9 for sliding along the X-axis direction through an X-axis slide assembly, and the X-axis slide assembly includes an X-axis servo motor 10 and an X-axis ball screw 11 driven by the X-axis servo motor 10, and the X-axis ball screw 11 is used to drive the slider on the X-axis guide rail 12, and the left slide plate 13 is installed on the slider. A right slide plate 15 is provided on the right side of the Z-axis slide saddle 9 for sliding along the Y-axis direction through a Y-axis slide assembly, and the Y-axis slide assembly includes a Y-axis servo motor 18 and a Y-axis ball screw 16 driven by the Y-axis servo motor 18, and the Y-axis ball screw 16 is used to drive the slider on the Y-axis guide rail 17, and the right slide plate 15 is installed on the slider. The left main spindle box 19 is installed on the left slide 13, and the right main spindle box 21 is installed on the right slide 15. The X-axis and the Y-axis are opposite and on the same axis and both are perpendicular to the Z-axis. The left main spindle box 19 and the right main spindle box 21 are symmetrically distributed on the left and right sides of the Z-axis slide saddle 9. The tool body 20 is provided on the side of the left main spindle box 19 and the right main spindle box 21 close to the workpiece 26 for processing the end face of the workpiece 26. Preferably, as Fig.13 As shown, the tool body 20 includes a center drill 20-1 disposed at the center thereof and a blade 20-2 disposed at the periphery of the center drill 20-1. The center hole is drilled by the center drill 20-1, and the end surface is milled by the blade 20-2.

[0045] Preferably, if Figure 7 As shown, the chip conveyor 3 is placed behind the bed 1 along the Z-axis direction, a chip accumulation car 4 is provided at the outlet of the chip conveyor 3, a water tank 5 is arranged on the left side of the chip conveyor 3, a hydraulic station 6 is arranged on the left side of the water tank 5, and an electric box 2 is arranged on the right side of the chip conveyor 3.

[0046] During processing, the turntable 24 is used to drive the workpiece 26 to switch between the first processing posture and the second processing posture, and the Z-axis saddle 9 is used to drive the workpiece 26 to move forward and backward along the Z-axis direction to achieve eccentricity adjustment. Fig.14 As shown, in the first machining posture, the end face of the first axis 26-1 of the workpiece 26 faces the tool body 20 of the left spindle box 19, and the end face of the third axis 26-3 of the workpiece 26 faces the tool body 20 of the right spindle box 21. It should be noted that in Fig.14 In the figure, the top view is the main view of the workpiece 26, and the top view is between the left spindle box 19 and the right spindle box 21. In the second machining posture, the end face of the fourth axis 26-4 of the workpiece 26 faces the tool body 20 of the left spindle box 19, and the end face of the second axis 26-2 of the workpiece 26 faces the tool body 20 of the right spindle box 21.

[0047] The working principle of this utility model:

[0048] The layout of the special plane:

[0049] The integral casting bed of the horizontal structure is used as the integral horizontal seat, the slide saddle in the Z-axis direction is located in the center of the bed, the X-axis and Y-axis directions, namely the left and right spindle boxes and the left and right slide plates, are symmetrically distributed on the left and right sides of the Z-axis and are perpendicular to the Z-axis, the bottom surface of the L-shaped tooling connector is fixedly connected to the Z-axis slide saddle, the vertical surface of the L-shaped tooling connector is fixedly connected to the bottom surface of the turntable, and the bottom plate of the workpiece positioning clamping fixture is connected to the turntable. At this time, the virtual plane formed by the axis of the 1st and 3rd axes of the workpiece and the X-axis and Y-axis is perpendicular to the Z-axis; the virtual plane formed by the axis of the 2nd and 4th axes of the workpiece and the X-axis and Y-axis is perpendicular to the Z-axis; through the eccentric distance of the Z-axis movement and the positive and negative rotation of the turntable, the two virtual planes can be smoothly switched, thereby realizing the processing of cross axes with different eccentric distances. The chip conveyor is placed behind the bed along the Z-axis, and a chip accumulation car is provided at its outlet. The water tank is placed on the left side of the chip conveyor, the hydraulic station is placed on the left side of the water tank, and the electric box is placed on the right side of the chip conveyor.

[0050] Special aircraft configuration overview:

[0051] The configuration of the special machine is composed of machine tool electronic control, hydraulic control, automatic lubrication, automatic chip conveyor and cooling (cooling pump) and other components. Each slide of the special machine adopts a servo motor to drive the ball screw to feed, with high precision and stable performance. The special machine adopts a rectangular structure guide rail with good rigidity, full enclosed protection, strict safety and reliability. It adopts steel-inlaid quenched guide rails for precision grinding, and the accuracy and subsequent processing accuracy are well maintained. In addition to loading and unloading, the processing process can be automated. The machine tool is fully enclosed for protection, and the CNC system adopts a domestic model control system. The drive unit and drive motor matched with the control system are used for the drive, and the main motor adopts variable frequency speed control. It has the advantages of high precision, high efficiency, high flexibility and high degree of automation.

[0052] Electrical and capacity overview of the special machine:

[0053] The total power supply of the machine tool electrical control cabinet is three-phase four-wire AC 380V, 50HZ, one of which is a protective ground wire, which is connected to the grounding bolt of the machine tool shell, and its voltage fluctuation range is allowed to be -10%-+15%. The operating temperature of the machine tool is 0℃-45℃, and good ventilation conditions are required. The electrical control voltage level of the machine tool is single-phase AC220V for controlling AC control circuits, machine tool lighting, etc.; three-phase AC220V for controlling servo controllers and NC power supply; single-phase AC24V for controlling 24V rectification; DC 24V rectification for controlling Z-axis brake, solenoid valve, and three-color indicator light; DC24V for providing control power to NC, display, input, and output interfaces. Machine tool electrical capacity: 20KVA, total fuse current: 60A.

[0054] Brief description of electrical operation of special machine:

[0055] After the machine tool is powered on, first press the NC start button to put the NC into the power-on state. After the servo is ready, select the zero return state and perform the zero return operation to ensure that the movement stroke of the X, Y, and Z axes is correct. If the X, Y, and Z axes exceed the specified movement stroke during feeding, in the jog state, first press the overtravel release key, and then operate the jog button in the opposite direction of the overtravel, and the overtravel state can be released. When starting the spindle, the fixture and turntable must be in a clamped state, otherwise the spindle will not rotate. The machine tool operation consists of two parts, one part is NC operation; the other part is machine tool operation. The operator selects different buttons according to needs to perform the required functional operations.

[0056] This special machine can realize the specific example of automatically adjusting the eccentricity between the two axes of the cross axis, automatically rotating 90° to switch two-axis processing, and milling the end face and drilling the center hole at one time (such as Fig.14 Schematic diagram shown):

[0057] According to the different eccentricity between the two axis lines of the product model and the different total length of the end surface of the same axis, the corresponding program is compiled. An example of cross axis processing:

[0058] Processing program: Corresponding machine action:

[0059] G54 Select workpiece coordinate system 1

[0060] M26 fixture assembly clamps the workpiece

[0061] G00 X0 Y0 M10 The rotary table rotates forward, driving the workpiece on it to rotate to the processing direction of axis 1 and 3. M23 S1000 The left and right spindles run at 1000r / min

[0062] G00 Z-38.78 The Z-axis saddle drives the workpiece to move quickly to the first processing position

[0063] G00 X-52.5Y-37.5 The left and right spindle boxes quickly move and position to the 1-3 axis ends of the workpiece.

[0064] G01 X-69.65Y-54.22F60 The left and right spindle box tools mill and drill the workpiece to size at a feed rate of 60mm / min G00 X0 Y0 The left and right spindle boxes move quickly and position and return to the starting point immediately

[0065] G55 M11 Select workpiece coordinate system 2, the rotary table reverses to drive the workpiece on it to rotate to the processing direction of axis 2 and 4. M23 S1000 The left and right spindles run at 1000r / min

[0066] G00 Z-30.75Z axis saddle drives the workpiece to move quickly to the second processing position, realizing the eccentricity of the two axes 8.03mmG00 X-52.5Y-37.5The left and right spindle boxes move quickly to the 2-4 axis ends of the workpieceG01 X-69.65Y-54.22F60The left and right spindle box tools mill and drill the workpiece to size at a feed speed of 60mm / minG00 X0 Y0The left and right spindle boxes move quickly to position and return to the starting point immediately

[0067] It is understandable that, for those skilled in the art, any equivalent replacement or change to the technical solution and the concept of the utility model should fall within the protection scope of the claims attached to the utility model.

Claims

1. A special machine for milling end faces and drilling center holes that can automatically adjust the cross-axis eccentricity, characterized in that: It comprises a bed (1), a Z-axis slide saddle (9), an L-shaped tooling connector (23), a rotary table (24) and a tooling fixture assembly (27). A Z-axis saddle (9) is arranged in the middle of the bed (1) to slide along the Z-axis direction through a Z-axis sliding assembly, the Z-axis direction is perpendicular to the upper surface of the bed (1), the bottom surface of the L-shaped tooling connector (23) is fixed on the Z-axis saddle (9), and a turntable (24) is fixedly installed on the vertical surface of the L-shaped tooling connector (23); the bottom plate of the tooling fixture assembly (27) is connected to the turntable (24), an eccentric positioning block (25) is positioned and installed on the turntable (24), a workpiece (26) to be processed is clamped and positioned on the eccentric positioning block (25) through the tooling fixture assembly (27), and the plane where the workpiece (26) is located is perpendicular to the Z-axis direction; A left slide plate (13) is provided on the left side of the Z-axis slide saddle (9) for sliding along the X-axis direction through an X-axis slide assembly, and a right slide plate (15) is provided on the right side of the Z-axis slide saddle (9) for sliding along the Y-axis direction through a Y-axis slide assembly. The X-axis and Y-axis directions are opposite and on the same axis, and both are perpendicular to the Z-axis, so that a left spindle box (19) installed on the left slide plate (13) and a right spindle box (21) installed on the right slide plate (15) are symmetrically distributed on the left and right sides of the Z-axis slide saddle (9), and a tool body (20) is provided on one side of the left spindle box (19) and the right spindle box (21) close to the workpiece (26) for processing the end face of the workpiece (26); During processing, the turntable (24) is used to drive the workpiece (26) to switch between a first processing posture and a second processing posture, and the Z-axis saddle (9) is used to drive the workpiece (26) to move forward and backward along the Z-axis direction to achieve eccentricity adjustment.

2. The machine for milling end face and drilling center hole with automatic adjustment of cross shaft eccentricity according to claim 1 is characterized in that: In the first machining posture, the end face of the first axis (26-1) of the workpiece (26) faces the tool body (20) of the left spindle box (19), while the end face of the third axis (26-3) of the workpiece (26) faces the tool body (20) of the right spindle box (21).

3. The special machine for milling end face and drilling center hole with automatic adjustment of cross shaft eccentricity according to claim 1, characterized in that: In the second machining posture, the end face of the fourth axis (26-4) of the workpiece (26) faces the tool body (20) of the left spindle box (19), while the end face of the second axis (26-2) of the workpiece (26) faces the tool body (20) of the right spindle box (21).

4. The special machine for milling end face and drilling center hole with automatic adjustment of cross shaft eccentricity according to claim 1, characterized in that: The Z-axis sliding assembly comprises a Z-axis servo motor (7) and a Z-axis ball screw (8) driven by the Z-axis servo motor (7); the Z-axis ball screw (8) is used to drive a slider on a Z-axis guide rail (14); and a Z-axis saddle (9) is mounted on the slider.

5. The special machine for milling end face and drilling center hole with automatic adjustment of cross shaft eccentricity according to claim 1, characterized in that: The X-axis sliding assembly comprises an X-axis servo motor (10) and an X-axis ball screw (11) driven by the X-axis servo motor (10), wherein the X-axis ball screw (11) is used to drive a slider on an X-axis guide rail (12), and a left slider (13) is mounted on the slider.

6. The special machine for milling end face and drilling center hole with automatic adjustment of cross shaft eccentricity according to claim 1, characterized in that: The Y-axis sliding assembly comprises a Y-axis servo motor (18) and a Y-axis ball screw (16) driven by the Y-axis servo motor (18); the Y-axis ball screw (16) is used to drive a slider on a Y-axis guide rail (17); and the right slide plate (15) is mounted on the slider.

7. The machine for milling end face and drilling center hole with automatic adjustment of cross shaft eccentricity according to claim 1, characterized in that: A turntable connecting plate (29) and a pad (22) are sequentially arranged between the eccentric positioning block (25) and the turntable (24); one end of the positioning pin (28) extends into a positioning pin hole (25-1) at the bottom of the eccentric positioning block (25); the other end of the positioning pin (28) sequentially passes through the turntable connecting plate (29) and the pad (22) and then extends into the turntable (24), so that the eccentric positioning block (25) and the turntable (24) are coaxially positioned.

8. The machine for milling end face and drilling center hole with automatic adjustment of cross shaft eccentricity according to claim 1 or 7, characterized in that: The fixture assembly (27) comprises a cylinder (30), a cylinder connecting plate (31) is arranged on the side of the cylinder (30) facing the workpiece (26), and a piston rod (32) of the cylinder (30) passes through the cylinder connecting plate (31) and then extends toward the workpiece (26) for pressing the workpiece (26); cylinder support rods (33) are installed on the cylinder connecting plates (31) on both sides of the piston rod (32), and the other end of the cylinder support rod (33) is used to penetrate into the fixing hole (25-2) on the eccentric positioning block (25) to fasten the eccentric positioning block (25).

9. The machine for milling end face and drilling center hole with automatic adjustment of cross shaft eccentricity according to claim 1, characterized in that: It also includes a chip conveyor (3), which is placed behind the bed (1) along the Z-axis direction, a chip accumulation vehicle (4) is provided at the outlet of the chip conveyor (3), a water tank (5) is provided on the left side of the chip conveyor (3), a hydraulic station (6) is provided on the left side of the water tank (5), and an electric box (2) is provided on the right side of the chip conveyor (3).

10. The machine for milling end face and drilling center hole with automatic adjustment of cross shaft eccentricity according to claim 1, characterized in that: The tool body (20) comprises a center drill (20-1) arranged at the center thereof and a blade (20-2) arranged at the periphery of the center drill (20-1).

Images