WO2014012238A1 - Novel drill chuck - Google Patents

Abstract

Disclosed is a novel drill chuck, provided with a drill chuck main body (1), a rear body (2), and a jaw (3). The drill chuck main body (1) is provided with a jaw bore (4) and the jaw (3) is located in the jaw bore (4). The jaw (3) is provided with jaw internal threads (17), the rear body (2) is provided with rear body external threads (16), the jaw internal threads (17) and the rear body external threads (16) mate with each other, and the lead angle of the rear body external threads (16) and the jaw internal threads (17) is in a range of 2.08°≤α≤9.76°. The structure is widely applicable to the machining field, and can solve the problem of a jam due to too tight a clearance, or a lack of reliability due to too loose a clearance, between an internally threaded drill chuck jaw and the rear body.

Description

 New drill chuck

Technical field

The invention relates to a clamp for a machining tool, in particular to a tool capable of avoiding over-tightening between the drill chuck body and the rear body and being stuck or loose to make the connection unreliable and suitable for small mechanical processing tools. New drill chuck.

Background technique

Drilling and milling are often used in production and processing activities, such as machine tools and electric drills. The drill chucks used to hold the drills, milling cutters, etc. on the working axes of these equipments have experienced long-term application and improvement. However, there are still many shortcomings.

For example, a new type of self-tightening chuck is disclosed in the patent application with the publication number CN102343447A, which is mainly provided with a drill chuck body, a push screw, a push nut and a jaw. The jaws are smooth, the surface is not provided with a thread, and a jaw hole is provided on the body of the drill chuck, and the jaws are all located in the jaw hole. T-shaped bosses are arranged on the tops of all the jaws, and T-shaped grooves equal to the number of jaws are uniformly arranged on the pushing nut, and each T-shaped protruding head is correspondingly disposed in the T-shaped groove, so that the clip is clamped The jaws form a relatively fixed connection with the push nut. The inner ring portion of the pushing nut is provided with a thread, and the pushing screw is also provided with an external thread, and the pushing screw is located in the inner ring of the pushing nut, and the external thread cooperates with the thread on the inner ring of the pushing nut to rotate When the screw is used, the push nut moves up and down with the rotation of the push rod, thereby driving the jaws to move up and down in the jaw hole, and the screw angle of the external thread of the screw and the thread of the inner ring of the push nut is 2° ≤ α ≤ 8°.

This range of helix angles is set for the thread that pushes the screw and push nut, and is not suitable for drill chucks that do not use push nuts and push rods. The existing internal thread drill chucks are generally large, long and thick, and can only be applied to large processing tools such as machine tools, and are not suitable for some small processing tools such as hand drills. Moreover, although the larger internal threaded drill chuck has a large clamping force, it must be released by means of a special tool when changing the tool, which causes great inconvenience to the operator during production and operation. Especially after the special tools are lost or damaged, the drill chuck becomes a waste, causing a lot of unnecessary waste.

Summary of the invention

The invention provides a technical problem that the existing internal thread drill chuck jaws and the rear body are easily over-tightened or too loose to be stuck or unreliable and can only be used on a larger machining tool. A new type of drill chuck that can be used for small processing tools by avoiding over-tightening between the jaws and the rear body or being too loose and unreliable.

To this end, the present invention is provided with a drill chuck body, a rear body and a clamping jaw. The drill chuck body is provided with a clamping jaw hole, and the clamping jaw is located in the clamping jaw hole, and the clamping jaw is provided with the internal thread of the clamping jaw on the rear body. The rear external thread is provided, and the internal thread of the jaw is matched with the thread of the rear body. The spiral angle of the thread of the external thread and the internal thread of the jaw is: 2.08° ≤ α ≤ 9.76°.

A preferred technical solution of the present invention is that the spiral angle of the rear external thread and the internal thread of the jaw is in the range of 3.28° ≤ α ≤ 8.05°.

A further preferred technical solution of the present invention is that the spiral angle of the post-external thread and the internal thread of the jaw is in the range of 4.85° ≤ α ≤ 7.63°.

A still further preferred embodiment of the present invention is that the helix angle of the rear external thread and the internal jaw of the jaw is in the range of 5.39 ° ≤ α ≤ 6.59 °.

In the technical solution of the present invention, the value of the helix angle α of the internal thread of the jaw and the thread of the back and outer thread is a key point for realizing the technical effect of the present invention on the premise that the rest of the structure is determined. If the value of α is too small, the back body and the jaw will be in an over-tight state, which is easy to be stuck, and requires special tools to open, which is time consuming and laborious; and if the value of α is too large, the between the rear body and the jaw will be It is too loose and the connection is not reliable.

The invention reasonably selects the value of the helix angle of the rear external thread and the internal thread of the jaw, so that the rear body and the jaw are in an ideal connection state required by the device, and there is no jamming and can not be opened or connected. Unreliable and not close to the tool. The larger the helix angle is, the larger the pitch is. According to the different equipment used, by adjusting the screw angle of the drill chuck thread, the overall size of the drill chuck can be adjusted, so that it can be applied to a small size like a hand drill. On the machining tool, avoid the disadvantage that the drill chuck can not be opened or the looseness is unreliable and the drill chuck can not be used due to over-tightening, so that the drill chuck can be clamped tightly and not slippery when working; It's easy to open with your hands without having to use special tools. The invention can greatly facilitate the operator, improve the work efficiency and avoid unnecessary waste. The invention can be widely applied to new drill chucks of large, medium and small processing tools, thereby replacing most of the wrench drill chucks, hand tight drill chucks and all self-tightening drill chucks on the existing market.

DRAWINGS

Figure 1 is a general assembly view of the present invention.

Figure 2 is a cross-sectional view of the drill chuck body of the present invention.

Figure 3 is a half cross-sectional view of the rear body of the present invention.

Figure 4 is a structural view of the jaw of the present invention.

Figure 5 is a half cross-sectional view of the front cover of the present invention.

Figure 6 is a half cross-sectional view of the back cover of the present invention.

The symbols in the figure indicate:

1. Drill chuck body; 2. Rear body; 3. Claw; 4. Clamp hole; 5. Bearing steel ball; 6. Bearing pad; 7. Spring; 8. Front sleeve; 9. Rear sleeve; Tool hole; 11. steel ball groove; 12. main body connection hole; 13. spring groove; 14. rear body protrusion; 15. partition groove; 16. rear external thread;

detailed description

Example 1:

As shown in FIGS. 1 to 4, the present invention mainly includes a drill chuck body 1, a rear body 2, a jaw 3, and a jaw hole 4. The rear body 2 is located in the drill chuck body 1 and cooperates with the drill chuck body 1. The jaws 3 are located in the jaw holes 4 of the drill chuck body 1 and are threadedly engaged with the rear body 2, and the rotation of the rear body 2 drives the jaws 3 to move up and down within the jaw holes 4.

The drill chuck body 1 is machined obliquely symmetrically with three jaw holes 4 extending through the upper and lower jaws, and the jaws 3 are located in the jaw holes 4. The rear end of the drill chuck body 1 is provided with a groove which is fitted to the drill chuck body 1 after the rear body 2 is inserted into this groove. A steel ball groove 11 is disposed on the rear body 2, and a ring of bearing steel balls 5 is placed in the steel ball groove 11. The lower end of the bearing steel ball 5 is supported by the rear body 2 and the inner wall of the drill chuck body 1, and the upper end is covered with a bearing pad 6. A catch spring 13 is arranged on the upper end of the bearing pad 6 on the drill chuck body 1, and the snap spring 7 is pinched by hand to press it on the bearing pad 6, and the retaining spring 7 is released to restore the elastic force. After being stretched, it is just stuck in the spring groove 13, so that it acts as a limit, so that the rear body 2 can only rotate laterally relative to the drill chuck body 1, and cannot be moved radially relative to the drill chuck body 1. . At the same time, because of the action of a ring of bearing steel balls 5, the sliding friction between the rear body 2 and the drill chuck body 1 becomes rolling friction, which greatly increases the flexibility of the rotation of the rear body 2. The bearing steel ball 5 can be set one turn or multiple turns, and the bearing steel ball 5 can also be selected from beads of other materials that can perform the same function.

The front end of the drill chuck body 1 is machined along its central axis with a tool hole 10 having a diameter larger than the outer diameter of the maximum applicable tool assembly, ensuring that the tool can be placed in the tool hole 10 and then clamped by the jaws. A partition groove 15 is further disposed between the cutter hole 10 and the recess of the rear body 2 in the drill chuck body 1. When the rear body 2 is inserted into the drill chuck body 1, the rear body disposed at the front end of the rear body 2 is provided. The protrusion 14 is just inserted into the partition groove 15 and fully engaged with it, thereby functioning for positioning and partitioning, and the dust generated when the jaw 3 clamps the tool for processing does not enter the rear end of the drill chuck, thereby The accuracy and service life of the drill chuck are guaranteed.

The rear body 2 is further provided with a rear external thread 16 which, when it is fitted into and mated with the drill chuck body 1, the rear external thread 16 is exactly in the jaw hole 4 on the drill chuck body 1. The internal threads 17 of the jaws of the jaws 3 cooperate with each other. Due to the restriction between the drill chuck body 1 and the rear body 2, when the rear body 2 is laterally rotated, the rear body 2 is threaded. The jaws 3 move up and down along the jaw holes 4. At the rear end of the rear body 2, a main body connecting hole 12 is further provided. After the working shaft of the main body is inserted into the main body connecting hole 12, the rotation of the working shaft drives the rear body 2 to rotate, and the two are threaded or the like. The same way of working together.

The helix angle α of the rear external thread 16 and the jaw internal thread 17 is 9.76°.

As shown in Figures 5 and 6, the present invention is further provided with a front sleeve 8 and a rear sleeve 9, the ends of the front sleeve 8 and the front end of the rear sleeve 9 cooperating to form a complete drill chuck. Two symmetrical grooves are provided at the rear end of the rear body 2, and after the rear sleeve 9 is sleeved on the rear body 2, the inwardly curved portion of the rear end of the rear sleeve 9 is just caught in the two grooves, The rear body 8 forms a relatively fixed connection, and when the rear sleeve 9 is rotated, the rear body 2 also rotates.

The number of the jaws 3 can be set to three, or two or more, as long as it is capable of clamping the tool.

An annular oil pool may be disposed at the front end of the drill chuck body 1. The oil pool may be continuous or may be disposed corresponding to the three jaws 3, and may be in a discontinuous state. The oil pool is sealed with grease to ensure that the jaws 3 can cut the grease of the inner ring during the up and down movement. The outer end of the drill chuck body 1 having the oil pool will be closely fitted with the front sleeve 8, so that the grease does not penetrate outward. After the oil pool is provided, the grease in the oil pool can be cut during the up and down movement of the jaws 3, so that the friction between the jaws 3 and the drill chuck body 1 is reduced, and the jaws 3 are extended. The time of flexibility further extends the life of the drill chuck.

The following describes the working process of the present invention:

Inserting the cutter into the cutter hole 10 of the drill chuck body 1 and rotating the rear sleeve 9 by hand, because the rear body 2 is fixedly connected with respect to the rear sleeve 9, the rear body 2 will rotate following the rotation of the rear sleeve 9, and The rear external thread 16 on the body 2 cooperates with the internal thread 17 of the jaws on the jaw 3, and the restriction between the rear body 2 and the drill chuck body 1 causes the rotation of the rear body 2 to force the jaw 3 to follow the clamp. The claw holes 4 are moved downward, and the gap between the lower ends of the three jaws 3 is also reduced until the cutter placed in the cutter hole 10 is clamped.

The main body connecting hole 12 of the rear body 2 is connected with the working shaft of the main body. At this time, the device motor is started, and the rear body 2 is rotated at a high speed by the working shaft, due to the static inertia between the rear body 2 and the clamping jaw 3, The initial stage of rotation of the rear body 2 has a strong impact force forcing the jaws 3 to rotate with them. This impact force further causes the three jaws 3 to clamp the tool, and then the reaction force between the tool and the workpiece is also forced. The relative rotation between the jaw 3 and the rear body 2 also increases the clamping force of the three jaws 3 on the cutter, because of the self-tightening function, the entire drill chuck has high precision and stability. As the motor rotates, the three jaws 5 clamp the tool to gradually rotate together, thereby completing the machining process.

Example 2:

The helix angle α of the rear external thread 16 and the internal thread 17 of the jaw is 8.05°.

Example 3:

The helix angle α of the rear external thread 16 and the jaw internal thread 17 is 7.63°.

Example 4:

The helix angle α of the rear external thread 16 and the jaw internal thread 17 is 6.59°.

Example 5:

The helix angle α of the rear external thread 16 and the jaw internal thread 17 is 5.39°.

Example 6

The helix angle α of the rear external thread 16 and the jaw internal thread 17 is 4.85°.

Example 7

The helix angle α of the rear external thread 16 and the jaw internal thread 17 is 3.28°.

Example 8

The helix angle α of the rear external thread 16 and the jaw internal thread 17 is 2.08°.

The rest of the structures of Embodiment 2 to Embodiment 8 are the same as those of Embodiment 1.

Table 1 is the average helix angle in the case of taking different pitches and heads.

Pitch (mm)	3.00	5.00	8.00	4.00	12.00	6.00	4.00	5.00
Head count	1.00	1.00	1.00	2.00	1.00	2.00	3.00	3.00
Lead (mm)	3.00	5.00	8.00	8.00	12.00	12.00	12.00	15.00
Small end diameter (mm)	24.10	25.60	27.85	24.85	30.85	26.35	24.85	25.60
Large end diameter (mm)	28.82	30.32	32.57	29.57	35.57	31.07	29.57	30.32
Average diameter (mm)	26.46	27.96	30.21	27.21	33.21	28.71	27.21	27.96
Small end spiral angle	2.27	3.56	5.22	5.85	7.06	8.25	8.74	10.56
Big end spiral angle	1.90	3.00	4.47	4.92	6.13	7.01	7.36	8.95
Average helix angle	2.08	3.28	4.85	5.39	6.59	7.63	8.05	9.76

Claims (4)

1. The utility model relates to a novel drill chuck, which is provided with a drill chuck body, a rear body and a clamping jaw. The drill chuck body is provided with a clamping jaw hole, and the clamping jaw is located in the clamping jaw hole, and the clamping jaw is provided with the internal thread of the clamping jaw. The rear body is provided with a posterior external thread, and the internal thread of the jaw is matched with the thread of the posterior body. The characteristic is that the spiral angle of the thread of the posterior external thread and the internal thread of the jaw is 2.08°≤α≤9.76°.
2. The novel drill chuck according to claim 1, wherein the spiral angle of the rear body thread and the jaw thread ranges from 3.28° ≤ α ≤ 8.05°.
3. The novel drill chuck according to claim 2, wherein the rear body thread and the jaw thread have a spiral angle of elevation of 4.85° ≤ α ≤ 7.63 °.
4. The novel drill chuck according to claim 3, characterized in that the spiral angle of the rear body thread and the jaw thread ranges from 5.39 ° ≤ α ≤ 6.59 °.

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