Lathe system improvement method

Abstract

The invention relates to a lathe system improvement method which comprises the following steps: step 1, dismounting a large carriage assembly, mounting a customized supporting seat, a chuck connecting flange and an adapter sleeve, and reinforcing through welding and bolt connection to ensure the structural stability and the machining precision, and step 2, adding a copper sheet gasket below a chuck to reduce vibration; the method comprises the following steps of 1, using an M16 * 850 screw rod to stabilize a cutter bar to avoid displacement in the machining process, 2, using a lathe spindle Morse taper hole to install a boring cutter bar to ensure the consistency of the boring depth and diameter, 3, installing an automatic direction adjusting mechanism on a lathe guide rail to simplify the steel pipe steering process and improve the machining continuity and safety, and 5, designing a periodic self-checking mechanism. And the aperture size is detected in combination with a trial assembly method, so that the quality consistency of each processing batch is ensured. According to the scheme, the machining process is optimized, efficient and precise boring machining of the two ends of the steel pipe is achieved, and labor intensity and production cost are effectively reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of machine tool modification, and particularly relates to an innovative modification scheme for a CA6140 lathe, aiming to realize precise boring of both ends of a steel pipe and automatic direction adjustment of the steel pipe. BACKGROUND

[0002] The traditional CA6140 lathe has problems such as low efficiency, poor precision, and vibration when machining holes at both ends of a steel pipe. In addition, the direction adjustment of the steel pipe usually relies on manual operation, which is not only labor-intensive but also affects productivity and safety. The original process of processing steel pipes in Meishan Mining Industry is to first clamp one end of the steel pipe with a chuck, install a center stand near the other end of the steel pipe, and install a φ102D4 bearing seat mounting hole. After completion, turn over, and use the same method to complete the machining of the other end φ102D4 bearing seat mounting hole. In the traditional steel pipe machining process, the boring of both ends of the steel pipe usually requires high precision and rigidity to prevent the problem of tool vibration during machining. However, the existing technology has problems such as low machining precision, high labor intensity, and low production efficiency. SUMMARY

[0003] The present application is aimed at the technical problems existing in the prior art, and provides a lathe modification scheme that can efficiently and accurately complete the machining of holes at both ends of a steel pipe while having automatic direction adjustment function.

[0004] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows: a lathe system improvement method, which modifies and shock-absorbing optimizes the lathe, designs a boring device and a direction adjustment mechanism, and realizes quality control. The specific steps are as follows:

[0005] Step 1, remove the large apron assembly, install the customized support seat, chuck connection flange and tight sleeve, and reinforce by welding and bolt connection to ensure structural stability and machining precision,

[0006] Step 2, add a copper lining pad below the chuck to reduce vibration; use a M16x850 screw rod to stabilize the tool bar,

[0007] Step 3, install the boring tool bar in the lathe spindle Morse taper hole to ensure the consistency of boring depth and diameter,

[0008] Step 4, install the automatic direction adjustment mechanism on the lathe guide rail for machining support cylinders with a length of 800mm to 1600mm. After boring one end, place the support cylinder on the turning mechanism, turn 180°, and then machine the other end. This simplifies the manual turning process of the steel pipe, reduces labor intensity, and improves machining continuity and safety,

[0009] Step 5, design a periodic self-checking mechanism for the accuracy quality detection of the inner diameter after boring, there are two methods, the first method, after every 20 pieces of support cylinder boring is completed, the bearing pad is assembled into the support cylinder to detect the tightness of the transition fit 0.08mm gap; the second method, use standard plug gauge to detect the inner diameter of the support cylinder. Use these two methods to test the hole size to ensure the quality consistency of each processing batch.

[0010] Compared with the prior art, the present application has the following advantages: the present application realizes the demand for high-precision boring of both ends of a steel pipe by innovatively modifying the key parts of a conventional CA6140 lathe, has high control performance, is easy to operate, has high man-machine efficiency, is easy to maintain, has simple mechanism structure, is easy to disassemble and clean for maintenance, has high precision and efficiency, and can process a steel pipe with a diameter of 108mm and a length of 400mm per hour;

[0011] (1) Optimize the processing flow to realize efficient and precise boring of both ends of a steel pipe, effectively reduce labor intensity and production cost;

[0012] (2) Introduce an automatic direction adjusting mechanism to significantly reduce labor intensity, improve production efficiency and safety factor of operation;

[0013] (3) Eliminate the gap between the flange below and the base cover plate to solve the problem of the vibrating cutter;

[0014] (4) Eliminate the positioning error caused by the loosening of the locking bolt. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 , support seat,

[0016] Figure 2 , chuck connecting flange,

[0017] Figure 3 , chuck flange locking sleeve,

[0018] Figure 4 , automatic direction adjusting mechanism schematic diagram,

[0019] Figure 5 , support adjusting roller support schematic diagram.

[0020] In the figure: 1. chuck, 2. chuck connecting flange 3. support seat 4. locking screw 5. chuck flange locking sleeve 6. bottom plate, 7. roller shaft, 8. base, 9. up-down height adjusting bracket, 10. roller. DETAILED DESCRIPTION

[0021] In order to deepen the understanding of the present application, the present embodiment will be described in detail below with reference to the accompanying drawings.

[0022] Example 1: see Figure 1A lathe system improvement method discloses an improved lathe system for high-precision boring and direction adjusting of both ends of a steel pipe and a hole processing method thereof, as shown in Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 as shown in

[0023] Figure 4 In the embodiment, after assembling the chuck 1, the chuck connecting flange 2 and the chuck flange fastening sleeve 5, the chuck flange fastening sleeve 5 is positioned by M12 threaded holes on the upper part of the three supporting seats 3, and then a positioning hole with a diameter of 12 is drilled on the chuck flange fastening sleeve 5. After reassembling, the three fastening screws are used for positioning.

[0024] Embodiment 2: refer to Figure 2 A lathe system improvement method discloses an improved lathe system for high-precision boring and direction adjusting of both ends of a steel pipe and a hole processing method thereof, as shown in Figure 5 as shown in Figure 5 In the embodiment, the supporting roller 10 is assembled into the supporting roller shaft 7, then is fixed on the up-down height adjusting support 9, and finally the whole component is assembled into the base 8 to complete the fixing. The device is mainly used for height adjustment and horizontal operation balance saving during the detection process of the precision and quality of the bored hole and the inner diameter after the boring.

[0025] Working principle:

[0026] The automatic direction adjusting mechanism is used for processing a supporting cylinder with a length of more than 800mm to 1600mm. After the boring of one end is completed, the supporting cylinder is placed on the turning mechanism, is turned over by 180°, and then the inner diameter of the other end is processed.

[0027] 1. Three supports (with a 10mm excess for finishing) are welded on the base plate according to the actual size measured (the base plate is first processed to have a thickness of 25mm on the upper and lower surfaces, a parallelism of 0.10mm, and is connected by an M16 screw rod) 2. The boring guide rod and boring cutter are installed in the No. 5 Morse taper hole of the lathe spindle, and the inner diameter of the support is coarsely and finely bored. After the boring of the support is completed, the hollow shaft is installed (attention is paid to the installation position requirement) and is fixed by the screw rod on the top of the support. 3. The three-jaw chuck connecting flange is installed (screw connection). 4. The three-jaw chuck is installed (connected with the flange surface, and is fastened by an M12*25 screw rod). 5. After the assembly is completed, the assembly precision is detected (the coincidence degree of the installation center and the machine center generatrix). 6. The processing stiffness of the modified machine tool is tested. After trial processing, the boring is smooth, the roughness (Ra1.6) and the boring precision roundness (0.001) meet the design standard and the processing requirement.

[0028] Self-checking mechanism, step: for the precision quality detection of the inner diameter after boring, there are two methods, the first method, after every 20 supporting cylinders are bored, bearing pad is assembled into the supporting cylinder to detect the tightness of the transition fit 0.08mm gap. The second method, the inner diameter of the supporting cylinder is detected by using standard plug gauge. The two methods are used to detect the hole size to ensure the quality consistency of each processing batch.

[0029] Operation instruction: first remove the knife holder on the large carriage, small carriage, middle carriage and middle carriage screw and other components. Process the supporting seat 3 pieces as shown in Figure 1 , the chuck connecting flange 1 piece as shown in Figure 2 , the chuck flange retainer sleeve 1 piece as shown in Figure 3 , refer to the position and size of 4-M16 screw hole on the slide plate box cover plate, make a bottom plate, weld the supporting seat on the bottom plate, and connect and fasten the bottom plate with the slide plate box by 4-M16 bolts. As shown in Figure 4 , then assemble the chuck, chuck connecting flange and retainer sleeve into the supporting seat. After installation, use M12 threaded holes on the upper part of the three supporting seats to mark and position on the retainer sleeve. Then drill a φ12 positioning hole on the retainer sleeve. After reassembling, use three retaining screws for positioning.

[0030] In order to further improve the machining precision and rigidity, and prevent the problem of tool vibration during machining, first mill a 16×20 groove on the chuck. After installation, use copper sheet to pad and eliminate the gap between the flange below and the cover plate of the base as much as possible to solve the problem of tool vibration. In addition, measure the size of each part after assembly, and drill and hinge two positioning pin holes at a reasonable position on the bottom plate after the trial product is qualified to eliminate the positioning error caused by loose retaining bolts. Finally, remove the three-jaw chuck on the spindle, use the spindle 6# Morse taper hole to process and install the boring bar, pay attention to use M16×850 screw rod to pass through the spindle hole to connect the boring bar and fix it on the left end of the spindle to prevent the boring bar from loosening during machining. Complete the modification of CA6140 lathe for machining the holes at both ends of the steel pipe.

[0031] In order to ensure product quality and reduce labor intensity, design and manufacture a machining part direction adjusting mechanism installed on the lathe guide rail, so that the direction adjusting of the steel pipe can be assisted by the direction adjusting mechanism. This not only ensures production safety, but also effectively reduces labor intensity in machining φ108*1150, φ108*1400, φ108*1600 supporting cylinders. Eliminate the laborious manual steering operation.

[0032] It should be noted that the above examples are not intended to limit the scope of protection of the present application. Any equivalent transformation or substitution made on the basis of the above technical solutions falls within the scope of protection claimed by the present application.

Claims

1. A method for improving a lathe system, characterized in that, The method includes the following steps: Step 1: Dismantle the large slide assembly, install the custom-made support base, chuck connection flange, and locking sleeve, and reinforce them with welding and bolts to ensure structural stability and machining accuracy. Step 2: Add a copper pad under the chuck to reduce vibration; use an M16×850 screw to stabilize the tool holder. Step 3: Install the boring bar using the Morse taper hole on the lathe spindle, ensuring consistency in boring depth and diameter. Step 4: The automatic steering mechanism installed on the lathe guide rail is used to process support cylinders with a length of more than 800 mm to 1600 mm. After one section of the bore is machined, the support cylinder is placed on the steering mechanism, turns 180°, and then the inner diameter of the other end is machined. Step 5: Design a periodic self-inspection mechanism to check the accuracy and quality of the inner diameter after boring. There are two methods: the first method is to assemble a bearing shell into the support cylinder after boring every 20 support cylinders to check the tightness of the 0.08 mm transition fit clearance; the second method is to use a standard plug gauge to check the inner diameter of the support cylinder.

2. The method for improving a lathe system according to claim 1, characterized in that, Step 4 is as follows: 1) First, place the three roughly machined brackets on the base plate according to the measured actual dimensions and then weld them; 2) Install the boring guide rod and boring tool in the No. 5 Morse taper hole of the lathe spindle to rough and fine bore the inner diameter of the bracket. After the bracket is bored, install the hollow shaft and fix it with the top screw of the bracket; 3) Install the three-jaw chuck connecting flange; 4) Install the three-jaw chuck and flange face connection and tighten it with M12*25 screws; 5) After assembly, check the assembly accuracy and the coincidence of the mounting center and the machine tool center generatrix; 6) Test the machining rigidity of the modified machine tool. After trial machining, the boring is stable, and the surface roughness (Ra1.6) and boring accuracy roundness (0.001) meet the design standards and the machining requirements.

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