CN113182890A

CN113182890A - General locator for drilling center hole

Info

Publication number: CN113182890A
Application number: CN202110574988.2A
Authority: CN
Inventors: 王建仁; 贾丽红; 刘杰
Original assignee: YANTAI HAIDE MACHINE TOOL CO Ltd
Current assignee: YANTAI HAIDE MACHINE TOOL CO Ltd
Priority date: 2021-05-26
Filing date: 2021-05-26
Publication date: 2021-07-30

Abstract

The invention provides a general locator for drilling a central hole, which comprises a left V-shaped body and a right V-shaped body, wherein two rack rods are arranged between the left V-shaped body and the right V-shaped body, a gear is arranged between opposite teeth of the two rack rods, a left clamping plate and a right clamping plate are respectively arranged on two end faces of the gear, a drill bushing is arranged in a gear hole, hand-twist screws are respectively arranged on the left V-shaped body and the right V-shaped body, a copper bushing is arranged at one end of each rack rod, and a nut is arranged at the other end of each rack rod. The locator of the invention has larger universal range and more accurate locating center, and is simple, convenient and quick to operate because the center hole drilled by the drill bushing is not inclined.

Description

General locator for drilling center hole

Technical Field

The invention belongs to the field of machinery, and particularly relates to a general positioner for drilling a central hole.

Background

In the machining process, a plurality of workpieces with larger diameters and longer lengths are often machined on a lathe, and before turning of the workpieces, a 60-degree central hole needs to be formed in one end face of a blank round steel of the workpieces. Then, the lathe can clamp the excircle of one end of the blank round steel and push the center hole of the other end of the blank round steel for turning. In the past, aiming at a large-diameter and longer workpiece blank round steel, three methods are adopted to drill a central hole: the method is characterized in that a blank round steel of a workpiece is directly clamped and mounted on a lathe to drill a center hole at one end, and after the lathe center is mounted on the outer circle of the blank round steel, the workpiece blank round steel can shake unstably when the lathe is started to drive the workpiece blank round steel to rotate due to poor roundness of the outer circle of the blank round steel, so that the front end part of a central drill bit is broken. The second method is to manually mark the end face of the round billet by using a marking gauge, approximately find the center of the round billet, drill a sample punching hole at the position of the visual center point, and then hold a central drill bit by a hand-held electric drill to align the sample punching hole and drill a central hole. The third method is to manufacture a center hole drill jig corresponding to blank round steel with different diameters, although the method is feasible, the drill jig has more specifications, is inconvenient to manage and wastes raw materials.

Disclosure of Invention

The invention provides a general locator for drilling a central hole, aiming at solving the problems.

The technical scheme of the invention is realized as follows: a general locator for drilling a central hole comprises a left V-shaped body and a right V-shaped body, wherein two rack rods are arranged between the left V-shaped body and the right V-shaped body, gears are arranged between opposite teeth of the two rack rods, a left clamping plate and a right clamping plate are respectively arranged on two end faces of each gear, a drill sleeve is arranged in each gear hole, hand-twist screws are respectively arranged on the left V-shaped body and the right V-shaped body, a copper bushing is arranged at one end of each rack rod, and a nut is arranged at the other end of each rack rod;

preferably, transverse plates are arranged on the left V-shaped body and the right V-shaped body;

preferably, one end of each rack rod is provided with a thread, the other end of each rack rod is provided with a stop table, the thread ends of the two rack rods are installed in an angular line, the threaded ends of the two rack rods are respectively provided with a circular truncated cone smaller than the outer diameter of the tooth part, and the distances from the circular truncated cone surfaces to the center of the first tooth groove of each rack rod are the same;

preferably, the copper bush is provided with a retaining shoulder and is positioned in the holes of the left V-shaped body and the right V-shaped body, the copper bush is slightly in interference fit with the holes of the left V-shaped body and the right V-shaped body, and the inner hole of the copper bush is in accurate clearance fit with the outer circle of the rack rod;

preferably, a radial hole is formed in the copper bush, a nylon round pad is arranged in the radial hole, and the nylon round pad is located below the hand-twist screw;

preferably, the gear is an even number of teeth;

preferably, a ring groove formed between the right clamping plate and the left clamping plate is in clearance fit with the parallel side face of the tooth end of the rack rod;

preferably, the left V-shaped body and the right V-shaped body are provided with inner hexagonal taper end set screws, and the taper ends of the inner hexagonal taper end set screws are pressed against the sunken pits in the rack rods.

The invention has the beneficial effects that: the universal positioner is arranged on the excircle and the end face of a workpiece blank bar, is used for positioning the center hole of the blank end face drilled by the electric hand drill, is an indispensable practical tool before the workpiece is machined by a lathe, and is particularly convenient and quick to position and drill the center hole by the positioner especially for the blank workpieces with large diameters and lengths of several meters. The universal range is large, the positioning center is accurate, and the center hole drilled by the drill bushing is not inclined, so that the operation is simple, convenient and quick.

Drawings

FIG. 1 is a front view of the present invention;

FIG. 2 is a schematic cross-sectional view taken along line A-A of FIG. 1 in accordance with the present invention;

FIG. 3 is a schematic cross-sectional view taken along line B-B of FIG. 1 in accordance with the present invention;

FIG. 4 is a schematic view of a center drill used in the present invention;

FIG. 5 is a schematic view of a rack bar in an embodiment of the present invention;

FIG. 6 is a schematic view of a gear structure according to an embodiment of the present invention.

Description of the parts: 1. the device comprises a left V-shaped body, a right V-shaped body, a rack rod, a transverse plate, a 5, a hand-twisting screw, a 6, a nylon round cushion, a 7, a copper bush, A8, a flat washer, a 9, a nut, a 10, an inner hexagonal socket head screw, a 11, a right clamping plate, a 12, a left clamping plate, a 13, a gear, a 14, a drill bushing, a 15, an inner hexagonal countersunk head screw, a 16, an inner hexagonal flat round head screw, a 17, an inner hexagonal cone end fastening screw, a 18, a workpiece, a 19, a round table, a 20, a stopping table, a 21, an A4 center drill, a 22, a standard measuring column, an L1, a distance from a first tooth socket to a gear center line, an L2, a first tooth size reference of two racks, and a position coinciding with the gear center line when the gear is installed.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Referring to figures 1-3:

example 1:

the first technical conditions are as follows:

1. the two rack rods are processed to be consistent in size precision;

2. the left V-shaped body and the right V-shaped body are processed to be consistent in size precision;

3. the number of gear teeth must be even.

4. The related technical parameters are as follows:

the number of rack bar teeth Z =54, module m =1.5, first tooth slot to gear centerline distance L1 is 108.383mm, and two rack first tooth dimension reference L2 is 10 ± 0.5 mm. (number of gear teeth Z =32, module m =1.5, number of teeth measured across 4, common normal length value 16.1709)

The utility model provides a bore general locator of centre bore, includes left V type body 1 and right V type body 2, is equipped with two rack bar 3 between left V type body 1 and the right V type body 2, is equipped with even number pinion 13 between 3 relative teeth of two rack bar, and gear 13 both ends face is equipped with left splint 12 and right splint 11 respectively, and the annular that forms between two splint of right splint 11 and left splint 12 is with the parallel side clearance fit of tip of tooth of rack bar 3. The downthehole drill bushing 14 that is equipped with of gear 13, be equipped with hand screw 5 and diaphragm 4 on the left side V type body 1 and the right V type body 2 respectively, 3 one ends of rack bar are equipped with copper bush 7, and the other end is equipped with

nut

9, and 3 one ends of rack bar are equipped with the screw thread, and one end is equipped with fender platform 20, and the installation of the 3 threaded end diagonal of two rack bars is equipped with radial hole on the copper bush 7, radial downthehole nylon cushion 6 that is equipped with, nylon cushion 6 is located hand screw 5 below.

The V-shaped grooves on the left V-shaped body and the right V-shaped body are used for clamping the outer circle of the workpiece blank round steel 18. The transverse plate 4 is respectively fixed on the left V-shaped body and the right V-shaped body by inner hexagonal socket head cap screws 10. The rack bar 3 is used for bearing the whole mechanism and preventing the rack bar 3 from being scratched or collided with the end face of a workpiece in a contact manner. The threaded end of the two rack rods 3 is provided with a circular truncated cone 19 smaller than the outer diameter of the tooth part, and the distance between the shoulder surface of the circular truncated cone and the center of the first tooth groove has to be consistent in size precision. The other end of the rack bar 3 has a stopper 20 for stopping the left and right V-shaped bodies to prevent the over-limit separation during the movement. Two copper bushings 7 with retaining shoulders are respectively arranged in related holes of the left V-shaped body and the right V-shaped body according to slight interference fit. The inner hole of the copper bush 7 is in accurate clearance fit with the outer circle of the rack bar 3. A radial hole (for installing the nylon round cushion 6) is arranged on the copper bush 7 and is matched with a threaded bottom hole for installing the hand-screw 5. The hand-twist screw 5 plays a role in locking, and the nylon round pad 6 prevents scars from being formed on the outer circle of the rack bar 3 by the hand-twist screw 5 when the locking is carried out. The assembly requirements are as follows: firstly two rack rods 3 are arranged, then even-number toothed gears 13 are arranged, before the even-number toothed gears 13 are arranged, the tooth tops of the two rack rods 3 are adjusted to be vertical in the radial direction and parallel to each other, and two nuts 9 are screwed tightly respectively. And starting from the first tooth groove at one end with threads of the two rack rods 3, taking the last number of grooves with the same number of grooves to adjust and align, marking the positions of the tooth grooves, and placing two opposite teeth of the gear into the gear in alignment with the marked tooth grooves. This ensures that the gear center coincides with the center between the left and right V-shaped bodies, the coinciding position being shown at a on fig. 5. Then, the drill bushing 14 is arranged in the gear hole and fixed by the hexagon socket flat round head screw 16, and the right clamping plate 11 and the left clamping plate 12 are respectively fixed on the two end faces of the even-number-tooth gear 13 by the hexagon socket countersunk head screw 15. The annular groove formed between the two clamping plates is in clearance fit with the parallel side surface of the tooth end of the rack bar 3. The inner hexagonal cone end fastening screw 17 is screwed down, and the cone end of the screw is propped against a prepared sunk pit on the rack bar 3 to prevent the rack bar 3 from rotating.

The using method comprises the following steps:

according to the diameter of the blank round steel of the workpiece, two hands respectively pinch the middle two side parts on the upper surfaces of the left V-shaped body and the right V-shaped body to perform left-right opening and closing actions, so that the transverse plate 4 is contacted with the end surface of the blank round steel 18 of the workpiece; the V-shaped grooves on the left V-shaped body and the right V-shaped body are contacted with the excircle of the workpiece blank round steel, and the hand-twisted screw 5 is screwed down. This allows a central hole to be drilled through the pilot hole of the drill sleeve 14 using a hand drill holding a central drill bit.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. The utility model provides a bore general locator of centre bore, its characterized in that includes left V type body (1) and right V type body (2), be equipped with two rack bar (3) between left side V type body (1) and the right V type body (2), be equipped with gear (13) between two rack bar (3) relative teeth, gear (13) both ends face is equipped with left splint (12) and right splint (11) respectively, downthehole drill bushing (14) that is equipped with of gear (13), be equipped with hand torque screw (5) on left side V type body (1) and the right V type body (2) respectively, rack bar (3) one end is equipped with copper bush (7), and the other end is equipped with nut (9).

2. The universal locator for drilling the central hole as claimed in claim 1, characterized in that the left V-shaped body (1) and the right V-shaped body (2) are both provided with a transverse plate (4).

3. The universal locator for drilling the central hole is characterized in that one end of each rack rod (3) is provided with a thread, the other end of each rack rod is provided with a stop (20), the thread ends of the two rack rods (3) are arranged in an end-to-end diagonal manner, the threaded ends of the two rack rods are respectively provided with a round platform (19) smaller than the outer diameter of the toothed part, and the distance from the shoulder surfaces of the two round platforms (19) to the center of the first tooth groove of each rack rod (3) is the same.

4. The general locator for drilling the central hole is characterized in that the copper bush (7) is provided with a retaining shoulder and is positioned in the holes of the left V-shaped body (1) and the right V-shaped body (2), the copper bush (7) is in slight interference fit with the holes of the left V-shaped body (1) and the right V-shaped body (2), and the inner hole of the copper bush (7) is in accurate clearance fit with the excircle of the rack rod (3).

5. The general locator for drilling the central hole is characterized in that the copper bush (7) is provided with a radial hole, a nylon round pad (6) is arranged in the radial hole, and the nylon round pad (6) is positioned below the hand-screw (5).

6. A universal locator for boring a central hole according to claim 1 or 2, characterized in that the gear (13) is an even number of teeth.

7. A universal locator for drilling a central hole according to claim 1 or 2, characterized in that the annular groove formed between the clamping plates of the right clamping plate (11) and the left clamping plate (12) is in clearance fit with the parallel side surfaces of the toothed end of the rack bar (3).

8. The general locator for drilling the central hole as in claim 1 or 2, characterized in that the left V-shaped body (1) and the right V-shaped body (2) are provided with the inner hexagonal tapered end set screw (17), and the screw tapered end of the inner hexagonal tapered end set screw (17) is pressed against the sunken hole on the rack bar (3).