CN207372703U - A kind of turning steep-pitch thread screw rod Special three-jaw formula follow-rest - Google Patents

Abstract

The utility model discloses a special three-jaw type heel tool holder for turning large-pitch screw rods, which belongs to the field of mechanical processing equipment. The design includes a semi-circular arc-shaped heel rest body (1), a sliding base driving screw (2), a slidable heel rest base (3), a telescopic drive rod for supporting claws (4), and an axially adjustable supporting claw ( 6), the trapezoidal bearing roller (13); the axially adjustable support claws are respectively designed in the radial direction of the tool holder body arc, and the trapezoidal bearing roller (13) is installed on the centripetal end, and the trapezoidal bearing roller can be moved along the workpiece axis. It can be adjusted in the direction, the structure presents a trapezoidal shape, the axially adjustable support claws can be stretched radially, and the semicircular arc-shaped heel holder body can slide along the slidable heel holder base. The utility model improves the processing accuracy of the large-pitch trapezoidal screw rod, is convenient to operate, safe and stable in use, and is suitable for processing large-pitch screw rods with different diameters and different pitches.

Description

A special three-claw heel tool holder for turning large-pitch threaded screws

technical field

The utility model relates to a special three-claw type heel tool holder for turning large-pitch screw rods, which belongs to the field of mechanical processing equipment.

Background technique

In the actual turning process of a large-pitch threaded screw on an ordinary lathe, due to the large screw pitch and high feed speed, the cutting force increases during the cutting process, and the vibration generated increases significantly, which seriously affects the machining accuracy and surface of the turning thread. quality.

The pitch of the large-pitch threaded screw is relatively large, and it cannot be completed at one time during turning. It needs to be cut in layers in the left and right axial directions, and multiple cuts are required. The traditional tool rest can only be clamped on the outer diameter of the workpiece, and it needs to follow the slide box for many times. Back-and-forth movement, multiple times of friction on the thread surface, the traditional tool rest easily causes great wear to the thread during the movement of the sliding crate, and even causes thread damage, and the support point of the traditional tool rest is in the same plane, So it is not suitable for clamping screw parts.

The size of the inner diameter of the large-pitch thread is inconsistent with the diameter of the tool relief groove left at the chucking end of the machine tool chuck. If the rack is not withdrawn in time, it will cause damage to the workpiece and the tool rest, resulting in danger.

Contents of the invention

The key technical problem to be solved by the utility model is to provide a special three-jaw type follower tool rest for turning large-pitch screw rods. Through the bearings installed on the rollers, the support point is in rolling contact with the workpiece, so as to solve the problem of the support point of the follower tool rest against the workpiece. Wear and tear; by adjusting the sliding base to drive the lead screw, the semicircular arc-shaped tool rest body is moved to the concentric position with the workpiece, and the trapezoidal bearing roller is positioned on the thread by axially adjusting the expansion and contraction of the trapezoidal bearing roller and the axially adjustable support claw. The bottom of the alveolar solves the problem of the traditional heel tool holder squeezing the damaged thread; the heel tool holder drives the lead screw by adjusting the sliding base, and when the thread is about to be processed, the heel tool holder is withdrawn in time, which increases safety; and The tool rest is easy to install, simple in structure and easy to operate.

The utility model provides a special three-jaw type heel tool holder for turning large-pitch threaded screw. Adjust the support claw, the trapezoidal bearing roller and the support claw telescopic drive rod.

Among them, tapered roller bearings are installed in the screw base at both ends of the driving screw of the sliding base to provide axial force and radial force for the driving screw of the sliding base, and are precisely matched with the driving screw of the sliding base. The nut is connected with the tool rest body in the semicircular arc shape, and drives the semicircular arc follower tool rest body slide plate to move along the guide rail of the base under the rotation of the driving screw of the sliding base.

The dovetail-shaped base guide rail is precisely matched with the semi-circular arc-shaped slide plate of the knife holder body, and the structure is stable. There is a positioning ladder at the near end of the guide rail, and the screw is driven to the positioning ladder through the sliding base, and the screw and the sliding plate are driven by locking the sliding base. The tightening bolts of the semi-circular arc are fixed to the body of the tool holder.

The trapezoidal bearing roller at the center end of the axially adjustable support claw is designed as a trapezoid, which improves the rigidity of the trapezoidal bearing roller and is also conducive to supporting to the bottom of the alveolar. With threads of different pitches, the trapezoidal bearing roller is clamped on the inner diameter, accompanied by The movement of the sliding crate moves along the thread, which greatly reduces the influence on the surface accuracy.

The trapezoidal bearing roller is equipped with a bearing, so that the sliding between the trapezoidal bearing roller and the workpiece is changed into rolling, which greatly reduces friction and reduces the wear on the workpiece; the inner ring of the bearing is installed on the sleeve, and on the sleeve The inner wall is fixedly equipped with flat keys.

The trapezoidal bearing roller is fixedly installed on the supporting claw through the pin shaft. There is a keyway on the pin shaft, which can make the sleeve slide on the pin shaft along the keyway. One end of the sleeve on the pin shaft is supported by a spring, and the other end is supported by an adjusting screw. Locate, turn the adjusting screw to adjust the axial position of the trapezoidal bearing roller.

The axially adjustable supporting claw is installed on the screw rod along the radial direction of the workpiece, and the screw rod and the axially adjustable supporting claw are precisely matched through nuts, and the rotation of the screw rod drives the expansion and contraction of the axially adjustable supporting claw.

A flat key is fixedly installed on the outer side of the telescopic drive rod of the support claw along the telescopic direction, and slides along the keyway on the inner wall of the radial hole of the arc portion of the heel rest to prevent the rotation of the axially adjustable support claw.

The threaded rod ladder is fixed in the radial hole of the arc-shaped part of the heel tool holder body through the through-hole external thread nut to provide the radial force of the axially adjustable support claw. Rotate the hand wheel, turn the threaded rod, the telescopic axially adjustable axially adjustable supporting claw is fixed by the tightening bolt on the side of the tool holder.

Description of drawings

Fig. 1 is a structural schematic diagram of a special three-jaw type heel tool holder for turning large-pitch screw rods according to the utility model.

Fig. 2 is a front view of a special three-jaw type heel tool holder for turning large-pitch screw rods in Fig. 1 .

Fig. 3 is a left view of a special three-jaw type heel tool holder for turning large-pitch screw rods in Fig. 1 .

Fig. 4 is a schematic structural diagram of the axially adjustable supporting claws of a three-claw type heel tool holder dedicated to turning large-pitch threaded screws in Fig. 1 .

Fig. 5 is a schematic structural diagram of the axially adjustable supporting claw bearing roller in Fig. 4 .

Fig. 6 is a schematic diagram of the structure of the special pin shaft for fixing the bearing roller with the axially adjustable support claw in Fig. 4 .

In the figure, 1. semicircular arc-shaped heel rest body, 2. sliding base driving screw, 3. slidable heel rest base, 4. telescopic drive rod for supporting claws, 5. tightening bolts, 6. axially adjustable Adjust supporting claw, 7, tapered roller bearing, 8, screw base, 9, bearing, 10, flat key, 11, sleeve, 12, spring, 13, trapezoidal bearing roller.

Detailed ways

The following is a detailed description of the technical features and methods of use of the utility model in conjunction with the accompanying drawings.

Figure 1 is a schematic diagram of the overall structure of a special three-jaw heel tool holder for turning large-pitch screw rods according to the utility model, including a slidable heel tool holder base 3 and a driving device, a semicircular arc-shaped heel tool holder body 1 and a centering tool holder The axially adjustable support claw 6, the slidable tool rest base 3 is installed on the saddle of the machine tool slide box, moves with the slide box, and there is a semi-circular arc available on the slidable tool rest base. The track is dovetail-shaped and is precisely matched with the semi-circular arc-shaped tool-rest body, so that the semi-circular arc-shaped tool-rest body can only move laterally and cannot be separated, so as to achieve stability; There are two lead screw bases 8 with tapered roller bearings 7 opposite to each other with a small taper angle on one side of the tool post base, one of the bases 8-1 is detachable to facilitate the sliding base to drive the lead screw and slide plate It is used to install the driving screw 2 of the heel rest, and the nut integrated with the slide plate of the heel rest and the driving screw of the sliding base are concentrically and precisely matched. Driven by the driving screw of the sliding base, the heel rest is pushed to move, A positioning ladder is provided at the base of the slidable tool holder, and a tightening bolt is provided at the base close to the driving screw of the sliding base to realize positioning and fixing together.

The semi-circular arc-shaped tool rest body 1, the center of the arc is concentric with the main shaft, the bottom 6-3 and the top of the semi-circular arc-shaped tool rest body are supported vertically 6-1, and the middle part is supported horizontally 6-2, as shown in Figure 4 The outer circle of the bearing roller at the radial end of the support claw is concentric with the main shaft, which can better improve the positioning accuracy.

Figure 5. The trapezoidal bearing roller 13 of the axially adjustable support claw is trapezoidal, which can better support the thread alveolar bottom. The trapezoidal bearing roller is equipped with a bearing 9, and the inner ring of the bearing is sleeved on the sleeve 11, and is fixed on the inner wall of the sleeve. There is a flat key 10, and the trapezoidal bearing roller is fixedly installed on the support claw through the pin shaft in Figure 6. One end of the sleeve on the pin shaft is supported by a spring (12), and the other end is positioned by the adjusting screw. Turn the adjusting screw to adjust the trapezoidal bearing. For the axial position of the rollers, adjust the three trapezoidal bearing rollers so that they are respectively positioned in the thread grooves.

The axially adjustable supporting claw is installed on the screw along the radial direction of the workpiece. The screw and the supporting claw are precisely matched through the nut. Through the rotation of the screw, the axially adjustable supporting claw is driven to expand and contract; the upper and outer sides of the axially adjustable supporting claw are along the The telescopic direction is fixed with a flat key, which slides along the keyway on the inner wall of the radial hole of the semicircular arc-shaped heel rest body to prevent the rotation of the support claw; the threaded rod step is fixed to the heel rest arc through the through-hole external thread nut In the radial hole, the radial force of the axially adjustable support claw is provided, and a handwheel is installed on the top end. By rotating the handwheel and turning the threaded rod, the telescopic axially adjustable support claw can be adjusted by adjusting the threaded rod and the axially adjustable support. The claws make the trapezoidal bearing rollers contact with the bottom of the alveolar, and play a supporting role. There is a scale in Figure 4 on each supporting claw, which is used to precisely adjust the supporting claws, so that the circle formed by the three trapezoidal bearing rollers and the workpiece and The main shaft is concentric, and the supporting claw is fixed by the tightening bolt 5 on the side of the tool holder body in a semicircular arc.

At the initial stage of thread turning, adjust the axial position of the three rollers and the thread rod to locate at the crest of the thread. When the bottom width of the groove of the turning thread is greater than the width of the outer diameter of the trapezoidal bearing roller, adjust the axial position of the three rollers to locate at the thread groove. At the bottom, after the fixed support of the tool holder is completed, the turning can be carried out. When the turning is about to be completed, turn the sliding base to drive the screw to exit the tool holder, and then follow the slide box to return for the next turning.

The utility model is not only limited to the above-mentioned fact mode, and the design and modification without substantial innovation of the utility model will all be within the protection scope of the utility model.

Claims (6)

1. a kind of turning steep-pitch thread screw rod Special three-jaw formula follow-rest, including semicircular arc follow-rest body（1）, slide base Seat driving leading screw（2）, slidably follow-rest pedestal（3）, support claw telescopic drive bar（4）, axially adjustable support claw（6）, ladder Shape bearing roller（13）；It is characterized in that：Slidably follow-rest pedestal is provided with dovetail slideway, semicircular arc follow-rest body In slidably follow-rest base rail, slidably follow-rest pedestal side is provided with leading screw pedestal（8）, one of silk Thick stick pedestal（8-1）Detachably, taper roll bearing is provided in leading screw pedestal, glide base driving leading screw passes through taper roller axis It holds and is installed on leading screw pedestal, drive the movement of semicircular arc follow-rest body, semicircular arc follow-rest body is in circular arc radial direction Direction is provided with axially adjustable support claw, respectively in top vertical supporting, middle part cross-brace and bottom vertical supporting three Position；Axially adjustable support claw is provided with trapezoidal bearing roller, is connected by axis pin, can be moved axially along axis pin, adjusts Supporting point position；Trapezoidal bearing roller structure presentation is trapezoidal, and the centripetal end of support claw telescopic drive bar is provided with axially adjustable branch Support claw, can be with radial expansion.

A kind of 2. turning steep-pitch thread screw rod Special three-jaw formula follow-rest according to claim 1, which is characterized in that axis The centripetal end of support claw telescopic drive bar is arranged to adjustable support pawl, trapezoidal bearing roller is installed, is rolled with workpieces processing Contact.

A kind of 3. turning steep-pitch thread screw rod Special three-jaw formula follow-rest according to claim 2, which is characterized in that axis It is provided with to the trapezoidal bearing roller in the centripetal end of adjustable support pawl containing flat key（10）Sleeve（11）, can be in axis pin along keyway Axial movement.

4. a kind of turning steep-pitch thread screw rod Special three-jaw formula follow-rest according to claim 3, which is characterized in that One end of axis pin upper bush is cased with spring（12）Support, the other end are positioned by adjusting screw rod, rotate adjusting screw rod, adjust trapezoid shaft Hold the axial position of idler wheel；Cutted thread initial stage by adjusting three idler wheel axial positions, is positioned at thread crest, when turning spiral shell When line alveolus bottom width is more than trapezoidal bearing roller outer diameter width, three idler wheel axial positions are adjusted, are positioned at ridge slot bottom；Axis It is trapezoidal to hold idler wheel presentation, insertion screw thread is contacted with alveolus bottom.

5. a kind of turning steep-pitch thread screw rod Special three-jaw formula follow-rest according to claim 4, which is characterized in that adjust Nut set is saved, adjusts top vertical supporting（6-1）With middle part cross-brace（6-2）Threaded rod adjust elongation, for adjust with Knife rest base bottom vertical supporting（6-3）Elongation makes idler wheel be positioned at ridge slot bottom, has scale on each support claw Ruler for precisely adjusting support claw, makes circle that three trapezoidal bearing rollers are formed and workpiece and main shaft concentric.

6. a kind of turning steep-pitch thread screw rod Special three-jaw formula follow-rest according to claim 5, which is characterized in that with Knife rest can be slided along slidably follow-rest pedestal, when that will process, rotate glide base driving leading screw by semicircular arc with Tool holder body exits in time, treats to return together with slip crate after the completion of screw rod cutting at one time；Slidably follow-rest base rail is in Swallow-tail form, with semicircular arc follow-rest body slide plate precise match.