CN2671725Y

CN2671725Y - Drill holder

Info

Publication number: CN2671725Y
Application number: CNU2004200168447U
Authority: CN
Inventors: 段正澄; 黄禹; 李敏
Original assignee: Huazhong University of Science and Technology
Current assignee: Huazhong University of Science and Technology
Priority date: 2004-01-07
Filing date: 2004-01-07
Publication date: 2005-01-19
Anticipated expiration: 2014-01-07

Abstract

The utility model discloses a drill holder, in particular relates to the drill holder used for holding drilling tool and solves the problems of easy accuracy guaranteeing, good component manufacture art and manufacture cost reducing to provide an efficient method for realizing the mass production of the drill holder with high accuracy. The drill holder of the utility model comprises a body, a hand-screw sleeve, a back pressing cover, a clamping paw base, screws, a pressing sleeve, a clamping paw, a cone sleeve and a steel ball. The cone sleeve is pressed on the cone surface of the clamping paw base of which rectangle or ladder shape slots and the rectangle or ladder shape slots on the cone sleeve are combined into three rectangle or ladder shape sliding slots in uniform distribution. The shoulder portion of the clamping paw is rectangle or ladder shape and can slide in the sliding slots. When the hand-screw sleeve rotates, the body drives the screws to advance to push the clamping paw to slide along the sliding slots and hold the drilling tool. The utility model has good art, stable accuracy and is suitable for multitudinous manufacture. The drill holder can be widely applied to the digital controlling machining center, the common machine lathe or the electric tool.

Description

Drill chuck

Technical field

The utility model belongs to the machine tool accessories field, is specifically related to the drill chuck of clamping drilling tool, can be applicable on numerical control machining center, machine tool or the electric tool.

Background technology

The drill chuck that is used for the clamping drilling tool generally is divided into two classes: a kind of is spanner drill chuck, need use spanner when clamping and pine are unloaded drilling tool, very inconvenient.Another kind is a keyless drill chuck, and the folder of its drilling tool unloads does not need special aid, easy to use, is applied in the higher occasions of required precision such as machining center, precision machine tool morely.But because its processing cost is higher, output is lower, is using the maximum field of power tools of drill chuck to use extensively inadequately.

It is the jaw of arc that present all drill chucks of producing all adopt shoulder, the chute of the step camber on overcoat inner conical surface and the jaw seat guide groove, and jaw moves in arc chute.When clamping drilling tool, jaw arc top forms line with the overcoat inner conical surface and contacts, and realizes drilling tool centering.Utility model patent 95235358.X is the shortcoming that overcomes overcoat positioning accuracy difference, adopts end face and screw thread to position, and has improved the positioning accuracy of overcoat.The double speed screw rod of pipe shape is set in the main body of patent of invention 98104888.9, the interior outside of double speed screw rod is connected with main body with screw respectively by screw thread, external screw thread pitch on the double speed screw rod is the several times of its internal thread pitch, makes the clamping of drill bit and pine unload very convenient laborsaving.

But above-mentioned drill chuck does not all relate to the jaw of production efficiency and the assembly precision problem that influences most.Jaw arc top was that line contacts with the overcoat inner conical surface when they clamped drilling tool, and positioning accuracy is difficult to guarantee, and precision stability is bad.In addition, the uniformity of paying the shape of jaw together directly influences the precision of drill chuck, because the shoulder of these jaws is an arc, and general employing shaping processing, machining accuracy is difficult to guarantee, often needs during assembling to match, and is not easy to a large amount of productions.

Summary of the invention

The utility model provides a kind of drill chuck, solves the problem that precision is easy to guarantee, parts machining process is good, cut down finished cost, for the production in enormous quantities that realizes high-precision drill chuck provides effective way.

A kind of drill chuck of the present utility model, form by main body, hand-screw cover, rear pressing cover, jaw seat, screw, overcoat, jaw and steel ball, main body is installed in the jaw seat, the main body afterbody is installed the hand-screw cover and is fixedlyed connected with it, steel ball is clipped between main body and rear pressing cover, screw is installed in the main body and with its screw thread and is in transmission connection, and screw head is with jaw, it is characterized in that:

Described overcoat is divided into gland and tapered sleeve two parts, and gland and jaw seat are pressed on tapered sleeve on the jaw seat conical surface by being threaded;

Have equally distributed rectangle step guide groove on the jaw seat, the tapered sleeve inner surface has rectangle step on equally distributed rectangular channel and the jaw seat guide groove in conjunction with forming three uniform rectangle chutes;

The jaw shoulder is a rectangle, places in the guide groove on described rectangle chute and the jaw seat.

Described drill chuck, described tapered sleeve inner surface also can have and have equally distributed terraced steps guide groove on equally distributed dovetail groove, the jaw seat, and they are in conjunction with forming three uniform trapezoidal chutes; Corresponding jaw shoulder can also place in the guide groove on described trapezoidal chute and the jaw seat for trapezoidal.

The technical scheme that the utility model adopted thoroughly changes the mode that adopts overcoat conical surface realization jaw clamping location.Overcoat is divided into gland and tapered sleeve two parts, and the guide groove step on the rectangle of leaving three even cloth on the tapered sleeve or dovetail groove and jaw seat forms rectangle or trapezoidal chute jointly, and shoulder is that the jaw of rectangle can slide in chute.During the clamping drilling tool, jaw shoulder end face reliably contacts with tapered sleeve square groove bottom surface, realizes reliable and stable location.

The utlity model has characteristics such as precision is easy to guarantee, parts machining process is good, processing cost is lower.Since employing face contact carrying out clamping location, positioning accuracy height, stability, good reproducibility.After changing the arc of jaw shoulder into rectangle, greatly improved the processing characteristics of jaw and be easy to detect its precision.After overcoat is divided into gland and tapered sleeve, improved the processing characteristics of tapered sleeve.The utility model provides effective way for the production in enormous quantities of drill chuck, can reduce its production and processing cost, makes it to be applied in field widely such as electric tool.

Description of drawings

Fig. 1 is the overall construction drawing of an embodiment of the utility model, and this drill chuck is made up of: main body 1, hand-screw cover 2, rear pressing cover 3, jaw seat 4, screw 5, gland 6, jaw 7, tapered sleeve 8 and steel ball 9.

Fig. 2 is the A-A cutaway view of Fig. 1, and tapered sleeve 8 and jaw seat 4 form rectangle chute 10, and jaw seat 4 has guide groove 11, jaw 7 clamping drilling tools 12.

Fig. 3 is the front view of tapered sleeve 8, and Fig. 4 is the left view of tapered sleeve 8, and Fig. 5 is that tapered sleeve B-B analyses and observe, and has rectangular channel 13 on the tapered sleeve 8.

Fig. 6 is the front view of jaw seat 4

Fig. 7 is the front view of jaw 7, and Fig. 8 is the left view of jaw 7, and Fig. 9 is the vertical view of jaw 7, and Figure 10 is the C-C cutaway view of jaw, and the shoulder 14 of jaw 7 is a rectangle.

The specific embodiment

The utility model is described in further detail below in conjunction with drawings and Examples.

In Fig. 1, main body (1) is installed in the jaw seat (4), main body (1) afterbody is installed hand-screw cover (2), steel ball is clipped between main body (1) and rear pressing cover (3), screw (5) is installed in the main body (1), and screw (5) head is with jaw (7), has the guide groove of rectangle step on the jaw seat (4), interior dress shoulder is the jaw (7) of rectangle, and gland (6) is pressed on the tapered sleeve (8) that inner surface has rectangular channel on jaw seat (4) conical surface.When clamping drilling tool, hand-screw cover (2) drives main body (1) and rotates relative to the jaw seat, drives screw by screw thread and advances, screw promotes jaw, jaw (4) is slided in rectangle chute and guide groove, and tapered sleeve (8) rectangular channel bottom surface reliably contacts with jaw (4) shoulder end face, clamps drilling tool.

As shown in Figure 2, tapered sleeve (8) and jaw seat (4) have formed rectangle chute (10), and jaw (7) can slide in the guide groove (11) of jaw seat (4) and rectangle chute (10).

Shown in Fig. 3,4,5, have rectangle chute (13) on the tapered sleeve (8).

Shown in Fig. 7,8,9,10, the shoulder (14) of jaw (7) is a rectangle.

Claims

1, a kind of drill chuck, form by main body (1), hand-screw cover (2), rear pressing cover (3), jaw seat (4), screw (5), overcoat, jaw (7) and steel ball (9), main body (1) is installed in the jaw seat (4), main body (1) afterbody is installed hand-screw cover (2) and is fixedlyed connected with it, steel ball is clipped between main body (1) and rear pressing cover (3), screw (5) is installed in the main body (1) and with its screw thread and is in transmission connection, and screw (5) head is with jaw (7), it is characterized in that:

Described overcoat is divided into gland (6) and tapered sleeve (8) two parts, and gland (6) and jaw seat (4) are pressed on tapered sleeve (8) on jaw seat (4) conical surface by being threaded;

Have equally distributed rectangle step guide groove on the jaw seat (4), tapered sleeve (8) inner surface has rectangle step on equally distributed rectangular channel and jaw seat (4) guide groove in conjunction with forming three uniform rectangle chutes;

Jaw (7) shoulder is a rectangle, places in the guide groove on described rectangle chute and the jaw seat (4).

2, a kind of drill chuck according to claim 1 is characterized in that described tapered sleeve (8) inner surface has on equally distributed dovetail groove, the jaw seat (4) to have equally distributed terraced steps guide groove, and they are in conjunction with forming three uniform trapezoidal chutes; Corresponding jaw (8) shoulder also is trapezoidal, places in the guide groove on described trapezoidal chute and the jaw seat (4).