Double-end numerical control boring lathe machine tool for hollow bent pipe shaft

Abstract

The utility model discloses a hollow elbow shaft double-end numerical control boring lathe which comprises a lathe body, boring mechanisms are symmetrically arranged on the lathe body, and a left positioning and clamping mechanism and a right positioning and clamping mechanism are arranged between the two boring mechanisms. The left positioning and clamping mechanism comprises a fixed seat, a workpiece positioning part is arranged on one side of the fixed seat, a workpiece centering positioner is arranged on the other side of the fixed seat, and a workpiece centering and clamping device is arranged on the top of the fixed seat; the left positioning and clamping mechanism and the right positioning and clamping mechanism are the same in structure. According to the positioning and clamping mechanism designed by the utility model, the workpiece clamping frequency is reduced, the labor intensity of workers and the machining cost are reduced, the machining efficiency is improved, and the machining precision is ensured.

Description

Technical Field

[0001] This utility model belongs to CNC boring and turning machine tools, specifically relating to a double-head CNC boring and turning machine tool for hollow bent tube shafts. Background Technology

[0002] like Figure 1 The hollow bent tube shaft structure is shown. Currently, the industry uses a single-head boring hydraulic special machine to process this type of part. It completes the boring and scraping of the welding bevel at both ends by fixing the cutting tool. After processing one end, it needs to be turned around to complete the processing of the other end.

[0003] In the process of realizing this utility model, the inventors discovered that:

[0004] The existing method requires clamping the workpiece twice, which wastes time; the tool is fixed, and when switching to workpieces of different specifications, the corresponding tool needs to be replaced, which is very troublesome; due to the double clamping, it is very difficult to guarantee the coaxiality of the inner holes at both ends and the symmetry of the two end faces with the workpiece as required by the drawings, and the level of automation is low. Summary of the Invention

[0005] In order to solve the problems existing in the prior art, this utility model provides a hollow bent tube shaft double-head CNC boring machine tool.

[0006] Therefore, the technical solution of this utility model is as follows: a hollow bent pipe shaft double-head CNC boring machine tool, including a bed, boring mechanisms are symmetrically arranged on the bed, and a left positioning clamping mechanism and a right positioning clamping mechanism are arranged between the two boring mechanisms. The left positioning clamping mechanism includes a fixed seat, a workpiece positioning component is provided on one side of the fixed seat, a workpiece centering positioner is provided on the other side of the fixed seat, and a workpiece centering clamping device is provided on the top of the fixed seat.

[0007] The workpiece centering clamp includes an active slider, a driven slider, a left rack, a right rack, a gear, a hydraulic cylinder, a left clamping arm, and a right clamping arm. The active slider and the driven slider, which are arranged opposite each other, are located in the sliding cavity of the fixed base. One end of the left rack is fixedly connected to the active slider, and one end of the right rack is fixedly connected to the driven slider. The other ends of the left rack and the right rack are connected by gear transmission. The hydraulic cylinder is used to drive the active slider. The left clamping arm is fixedly connected to the upper end of the active slider, and the right clamping arm is hinged to the upper end of the driven slider. The left clamping arm and the right clamping arm clamp the workpiece through the active slider and the driven slider moving in opposite directions.

[0008] The left positioning clamping mechanism and the right positioning clamping mechanism have the same structure.

[0009] A further limitation of the above technical solution is that the workpiece positioning component includes a positioning support and a positioning block, the positioning support is fixedly connected to the fixed base, the positioning block is fixed on the positioning support, and the positioning groove on the positioning block is V-shaped.

[0010] A further limitation of the above technical solution is that: the workpiece centering positioner includes a guide block, a lifting slider, a lifting cylinder, a slide rod, a wedge block, a limit nut, a compression spring, and a scale. The guide block is fixed on a fixed base. The lifting slider moves up and down on the guide block via the lifting cylinder. The top of the lifting slider is provided with a horizontal guide hole. The slide rod is slidably connected to the top of the lifting slider through the guide hole. One end of the slide rod is fixedly connected to the wedge block, and the other end of the slide rod is connected to the limit nut. The compression spring is sleeved on the slide rod and is located between the wedge block and the lifting slider. The scale is fixed on one side of the lifting slider and is used to observe the distance between the wedge block and the lifting slider.

[0011] A further improvement to the above technical solution is that: multiple positioning and clamping blocks are distributed on the clamping parts of the left and right clamping arms; the positioning and clamping blocks of the fixture can be replaced according to the size of the workpiece diameter to ensure that the axis of the workpiece with different diameters is concentric with the axis of the machine tool spindle.

[0012] Beneficial effects: The positioning and clamping mechanism designed in this utility model reduces the number of workpiece clamping operations, reduces the labor intensity and processing cost of workers, improves processing efficiency, and ensures processing accuracy. Attached Figure Description

[0013] Figure 1 This is a structural diagram of the workpiece described in this utility model.

[0014] Figure 2 This is a structural diagram of the present invention.

[0015] Figure 3 yes Figure 2 Top view.

[0016] Figure 4 This is a structural diagram of the left positioning and clamping mechanism.

[0017] Figure 5 yes Figure 4 Diagram of the middle wedge block structure.

[0018] Figure 6 yes Figure 5 Top view.

[0019] Figure 7 yes Figure 4 The right view.

[0020] Figure 8 yes Figure 5 Internal structure diagram.

[0021] Figure 9 yes Figure 6 Left sectional view.

[0022] The figure shows: 1. Bed; 2. Left boring mechanism; 3. Right boring mechanism; 4. Left positioning and clamping mechanism; 5. Right positioning and clamping mechanism; 6. Hollow bending tube shaft. Detailed Implementation

[0023] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings, but this embodiment should not be construed as a limitation of this utility model.

[0024] This utility model is as follows Figures 2 to 9 As shown:

[0025] A hollow tube bending shaft double-head CNC boring machine tool includes a bed 1, a left boring mechanism 2 and a right boring mechanism 3 symmetrically arranged on both sides of the bed, and a left positioning clamping mechanism 4 and a right positioning clamping mechanism 5 arranged between the left and right boring mechanisms;

[0026] The left positioning and clamping mechanism includes a fixed base 401, a workpiece positioning component is provided on one side of the fixed base, a workpiece centering positioner is provided on the other side of the fixed base, and a workpiece centering clamping device is provided on the top of the fixed base.

[0027] The structure of the left boring mechanism is as follows: the spindle box 201 is connected to the bed through the CNC slide 202, the input end of the spindle box is connected to the feed motor 204 through the differential compensator 203, the output end of the spindle box is provided with a rotary cutter head 205, the rotary cutter head is provided with a boring tool 206, and the boring tool realizes axial and radial working feed through the CNC slide, thereby realizing the cutting of the workpiece; the structure of the left boring mechanism is the same as that of the right boring mechanism;

[0028] The workpiece positioning component includes a positioning support 402 and a positioning block 403. The positioning support is fixedly connected to the fixed base, and the positioning block is fixed on the positioning support. The positioning groove on the positioning block is V-shaped. The advantage of this structure is that the V-shaped positioning groove helps to improve the positioning accuracy and is suitable for pipe fittings of various diameters. It has the advantages of low manufacturing cost and strong versatility.

[0029] The workpiece centering and positioning device includes a guide block 404, a lifting slider 405, a lifting cylinder 406, a slide rod 407, a wedge block 408, a limit nut 409, a compression spring 410, and a scale 411. The guide block is fixed on a fixed base. The lifting slider moves up and down on the guide block via the lifting cylinder. The top of the lifting slider has a horizontal guide hole. The slide rod is slidably connected to the top of the lifting slider through the guide hole. One end of the slide rod is fixedly connected to the wedge block, and the other end of the slide rod is threadedly connected to the limit nut to limit the distance between the two slide rods for initial positioning. The compression spring is sleeved on the slide rod and is located on the wedge block. Between the wedge block and the lifting slider; a scale is fixed on one side of the lifting slider and does not interfere with the sliding of the wedge block. The scale is used to observe the distance between the wedge block and the lifting slider. The advantages of this structure are: 1) During the workpiece positioning process, the workpiece pushes the wedge block to slide in the horizontal direction through the inclined surface on the wedge block; after the workpiece is positioned, the centering and positioning position of the wedge block is determined; 2) In order to further determine whether the centering and positioning is accurate, the distance between the wedge block and the lifting slider is observed through the scale; 3) The left and right floating wedge block is suitable for workpieces of various lengths and has the advantages of low manufacturing cost, automatic adjustment and strong versatility.

[0030] The workpiece centering clamp includes a driving slider 412, a driven slider 413, a left rack 414, a right rack 415, a gear 416, a hydraulic cylinder 417, a left clamping arm 418, and a right clamping arm 419. The driving and driven sliders, arranged opposite each other, are located in the slide cavity of the fixed base. One end of the left rack is fixedly connected to the driving slider, and one end of the right rack is fixedly connected to the driven slider. The other ends of the left and right racks are connected by gear transmission. The left and right racks are arranged opposite each other with the gear as the center. The hydraulic cylinder is used to drive the driving slider. The left clamping arm is fixedly connected to the upper end of the driving slider, and the right clamping arm is connected to the driving slider via a pivot pin 420. The driven slider is hinged at the top, and the left and right clamping arms clamp the workpiece through the opposing active and driven sliders; the gear is fixed in the fixed seat by bearing 421; the advantages of this structure are: 1) the rack has the advantages of smooth operation, high transmission accuracy, high transmission efficiency and long service life, which is conducive to improving the machining accuracy; 2) the use of opposing motion mechanism to achieve synchronous motion is conducive to reducing errors, and its simple structure is conducive to reducing production costs; 3) the right clamping arm can swing around the pivot pin at a small angle, so that the right clamping arm can automatically adjust to the optimal clamping position, which is conducive to improving the centering accuracy of the workpiece;

[0031] Multiple positioning clamping blocks 419 connected by screws are distributed on the clamping parts of the left and right clamping arms; the positioning clamping blocks can be replaced according to the size of the workpiece diameter to ensure that the axis of the workpiece with different diameters is concentric with the axis of the machine tool spindle, which is beneficial to improving the versatility of the left and right clamping arms.

[0032] The left positioning clamping mechanism and the right positioning clamping mechanism have the same structure.

[0033] The working principle of this utility model:

[0034] Start the lifting cylinder to raise the wedge block to the preset position and place the workpiece (hollow bent pipe shaft 6); the bent parts at both ends of the workpiece are respectively positioned on the positioning blocks of the left and right positioning clamping mechanisms, and the two end faces of the workpiece slide down into contact with the end faces of the wedge blocks in the left and right positioning clamping mechanisms, thereby achieving centering positioning; the scales displayed in the left and right positioning clamping mechanisms are consistent, indicating that the centering positioning is accurate (if inconsistent, it can be finely adjusted manually); start the cylinder, the cylinder drives the active slider, and through the left and right gears and the gear synchronously drives the driven slider, thereby realizing the left and right clamping arms moving towards each other until the workpiece is clamped; after clamping, the wedge block is lowered by the lifting cylinder, and the left and right boring mechanisms are started.

[0035] Any aspects not described in detail in this specification are techniques well-known in the art.

[0036] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A double-head CNC boring and turning machine tool for hollow bent pipe shafts, comprising a bed, on which boring mechanisms are symmetrically arranged, and a left positioning and clamping mechanism and a right positioning and clamping mechanism are provided between the two boring mechanisms, characterized in that: The left positioning and clamping mechanism includes a fixed base, a workpiece positioning component on one side of the fixed base, a workpiece centering positioner on the other side of the fixed base, and a workpiece centering clamping device on the top of the fixed base. The workpiece centering clamp includes an active slider, a driven slider, a left rack, a right rack, a gear, a hydraulic cylinder, a left clamping arm, and a right clamping arm. The active slider and the driven slider, which are arranged opposite to each other, are located in the sliding cavity of the fixed base. One end of the left rack is fixedly connected to the active slider, and one end of the right rack is fixedly connected to the driven slider. The other ends of the left rack and the right rack are connected by gear transmission. The hydraulic cylinder is used to drive the active slider. The left clamping arm is fixedly connected to the upper end of the active slider, and the right clamping arm is hinged to the upper end of the driven slider. The left clamping arm and the right clamping arm clamp the workpiece through the active slider and the driven slider moving in opposite directions. The left positioning clamping mechanism and the right positioning clamping mechanism have the same structure.

2. The hollow tube bending shaft double-head CNC boring and turning machine tool according to claim 1, characterized in that: The workpiece positioning component includes a positioning support and a positioning block. The positioning support is fixedly connected to a fixed base, and the positioning block is fixed on the positioning support. The positioning groove on the positioning block is V-shaped.

3. The hollow tube bending shaft double-head CNC boring and turning machine tool according to claim 1 or 2, characterized in that: The workpiece centering and positioning device includes a guide block, a lifting slider, a lifting cylinder, a slide rod, a wedge block, a limit nut, a compression spring, and a scale. The guide block is fixed on a fixed base. The lifting slider moves up and down on the guide block via the lifting cylinder. The top of the lifting slider has a horizontal guide hole. The slide rod is slidably connected to the top of the lifting slider through the guide hole. One end of the slide rod is fixedly connected to the wedge block, and the other end of the slide rod is connected to the limit nut. The compression spring is sleeved on the slide rod and is located between the wedge block and the lifting slider. The scale is fixed on one side of the lifting slider and is used to observe the distance between the wedge block and the lifting slider.

4. The hollow tube bending shaft double-head CNC boring and turning machine tool according to claim 3, characterized in that: Multiple positioning and clamping blocks are distributed on the clamping parts of the left and right clamping arms; the positioning and clamping blocks of the fixture can be replaced according to the size of the workpiece diameter to ensure that the axis of the workpiece with different diameters is concentric with the axis of the machine tool spindle.

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