CN212886548U

CN212886548U - Pull rod clamp for dividing head

Info

Publication number: CN212886548U
Application number: CN202021194111.8U
Authority: CN
Inventors: 乔银虎
Original assignee: Dufu Suzhou Industrial Equipment Manufacturing Co ltd
Current assignee: Dufu Suzhou Industrial Equipment Manufacturing Co ltd
Priority date: 2020-06-24
Filing date: 2020-06-24
Publication date: 2021-04-06
Anticipated expiration: 2030-06-24

Abstract

The utility model discloses a draw bar clamp for a dividing head, wherein the dividing head is provided with a dividing head base, a chuck and 3 clamping jaws arranged on the chuck, and the draw bar clamp comprises a central draw bar, a rear end cover plate and a gland; the rear end cover plate is fixed on the rear end surface of the dividing head base; the center pull rod penetrates through a center through hole of the dividing head base, the front end of the center pull rod is positioned in the center of the chuck and provided with a connecting hole with internal threads, and the rear end of the center pull rod is connected with the rear end cover plate; the gland compresses tightly the outside of the workpiece to be processed, and the screw rod part of a bolt fixes the gland and the front end connecting hole of the central pull rod in a threaded manner through the central hole of the gland. The utility model discloses the jack catch can not appear and crush the condition of circle or fish tail workpiece surface in the work piece, has stopped the work piece centre gripping and has warp or the risk such as crackle risk, vibrations drop, has effectively reduced the disability rate.

Description

Pull rod clamp for dividing head

Technical Field

The utility model relates to a machine tool accessory, concretely relates to a pull rod anchor clamps for fixing work piece on dividing head.

Background

The dividing head is a device commonly used in mechanical manufacturing and machining, and can divide a workpiece clamped on the dividing head at any angle and assist a machine tool to perform various machining operations. Generally, a chuck is arranged on the dividing head base, a clamping jaw is arranged on the chuck, the position of the clamping jaw is adjusted to enable the periphery of the clamping jaw to be tightly matched with the inner circle of a workpiece, and the workpiece is sleeved on the clamping jaw to realize clamping and fixing.

The above fixing method has the following defects: (1) the inner circle of the workpiece is clamped in the clamping jaw, and when the workpiece is clamped, an internally-clamped clamping jaw mark is left on the inner circle of the workpiece or the inner circle wall of the workpiece is scratched, so that unnecessary reworking or scrapping of the workpiece is caused, the working time is wasted, and the processing cost is increased; (2) when deep holes are machined in the outer circle of the workpiece, vibration is generated, sometimes the workpiece falls off from the clamping jaw, and even the drill bit is broken, so that the workpiece and the drill bit are scrapped, and the scrappage and the cost of the drill bit are increased; (3) when a deep hole on the outer circle of a thin-wall workpiece is machined, if the clamping force is too large, the workpiece is easy to clamp and deform or crack, so that the workpiece is scrapped, and if the clamping force is not enough, the workpiece can fall off during machining, so that the clamping force is difficult to control; (4) the clamping method can cause that the workpiece is not clamped in place or the workpiece is inclined in the clamping process, so that the machining size of the workpiece is unqualified, and the rejection rate is improved.

Therefore, a new clamp needs to be designed, and clamping and fixing of the workpiece are achieved by matching the clamping jaws on the indexing head.

Disclosure of Invention

The utility model aims at providing a pull rod anchor clamps for dividing head to overcome the defect that exists when adopting the jack catch centre gripping work piece interior circle among the prior art.

In order to achieve the purpose of the invention, the technical scheme adopted by the utility model is as follows: a pull rod clamp for an index head, wherein the index head is provided with an index head base, a chuck and 3 clamping jaws arranged on the chuck, and the pull rod clamp comprises a central pull rod, a rear end cover plate and a gland; the rear end cover plate is fixed on the rear end surface of the dividing head base; the center pull rod penetrates through a center through hole of the dividing head base, the front end of the center pull rod is positioned in the center of the chuck and provided with a connecting hole with internal threads, and the rear end of the center pull rod is connected with the rear end cover plate; the gland compresses tightly the outside of the workpiece to be processed, and the screw rod part of a bolt fixes the gland and the front end connecting hole of the central pull rod in a threaded manner through the central hole of the gland.

When the clamping device is used, the clamping jaws are adjusted to be in a state that the diameter of the clamping jaws is slightly smaller than that of the inner circle of a workpiece to be machined, the inner circle of the workpiece is installed on the adjusted clamping jaws, the pressing cover covers the center hole of the workpiece, the bolt simultaneously penetrates through the center hole of the pressing cover and the center hole of the workpiece and is screwed into the connecting hole of the center pull rod, and then the workpiece can be clamped. Because the clamping jaws only start to position initially, and the pull rod clamp plays a role in clamping the workpiece, the clamping jaws and the inner circle of the workpiece can be in clearance fit, and the workpiece cannot be damaged.

According to a further technical scheme, the connecting structure between the rear end of the central pull rod and the rear end cover plate is that a hole which is sleeved on the central pull rod is formed in the center of the rear end cover plate, external threads are formed in the rear end portion of the central pull rod and extend out of the hole in the rear end cover plate, and the rear end of the central pull rod is limited on the rear end cover plate through a nut.

Preferably, the nut is a self-locking nut.

In the technical scheme, the rear end cover plate is fixed with the rear end face of the dividing head base through 3-6 screws.

Preferably, the rear end cover plate is fixed with the rear end face of the dividing head base through 4 screws.

According to a further technical scheme, the rear end cover plate is provided with a drain hole.

Preferably, the number of the drain holes is 8.

In the above technical scheme, the gland is preferably a circular taper gland, and the middle thickness of the gland is greater than the peripheral thickness. So as to prevent the workpiece from loosening and the gland from deforming in the machining process.

Because of the application of the technical scheme, compared with the prior art, the utility model has the following advantages:

1. the utility model realizes the fixation of the workpiece by arranging the central pull rod and matching the rear end cover plate and the front end gland, so that the workpiece only needs to be loosely sleeved on the jack catch, and the situation that the inner circle of the workpiece is crushed by the jack catch or the surface of the workpiece is scratched by the jack catch can not occur;

2. the utility model adopts the pull rod clamping mode, compared with the clamping mode which only utilizes the clamping jaws, the clamping deformation or the crack risk of the workpiece when the deep hole on the excircle of the thin-wall part is processed is avoided; the risk of falling off due to vibration when the deep hole on the excircle of the part is machined is avoided, and the risk of breaking a drill bit due to falling of a workpiece is also eliminated;

3. the clamp of the utility model ensures that the workpiece is clamped in place, and the workpiece can not incline;

4. the utility model discloses clamping convenient and fast has reduced the clamping time, has improved production efficiency, has effectively reduced the disability rate.

Drawings

Fig. 1 is a schematic sectional view of a clamping state structure according to an embodiment of the present invention;

FIG. 2 is a left side view of FIG. 1;

FIG. 3 is a right side view of FIG. 1;

fig. 4 is a right side view of fig. 1 with the workpiece removed.

Wherein: 1. a index head base; 2. a chuck; 3. a claw; 4. a central pull rod; 5. a rear end cover plate; 6. a circular taper gland; 7. a screw; 8. connecting holes; 9. a self-locking nut; 10. a workpiece; 11. and (4) bolts.

Detailed Description

The invention will be further described with reference to the following drawings and examples:

the first embodiment is as follows:

referring to fig. 1, a drawbar clamp for an index head having an index head base 1, a

chuck

2, and 3 jaws 3 provided on the chuck 2 includes a center drawbar 4, a back end cover plate 5, and a circular tapered gland 6.

The central pull rod is provided with an external thread M20 at one end and an internal thread M16 at the other end.

Referring to fig. 2, the rear cover plate 5 is fixed to the rear end surface of the index head base 1 by 4 screws 7.

In fig. 1, a central pull rod 4 passes through a central through hole of a dividing head base 1, the front end of the central pull rod 4 is positioned in the center of a chuck and is provided with a connecting hole 8 with internal threads, the rear end of the central pull rod 4 is provided with external threads, and the central pull rod passes through a rear end cover plate 5 and is fixed by a self-locking nut 9; the round taper gland 6 compresses the outer side of a workpiece 10 to be processed, and the screw rod part of the bolt 11 fixes the gland and the front end connecting hole 8 of the central pull rod in a threaded manner through the central hole of the round taper gland 6.

In this embodiment, the rear end cover plate may be provided with a drain hole.

When the clamping jaw is used, as shown in fig. 4, the clamping jaw 3 is adjusted to be 0.05 mm smaller than the diameter of the inner circle of a workpiece to be processed, and as shown in fig. 3, the inner circle of the workpiece is arranged on the adjusted clamping jaw. The center hole of the workpiece is covered by the plane end of the circular taper gland 6, the inner hexagon bolt simultaneously penetrates through the center hole of the taper surface of the circular taper gland (5) and the center hole of the workpiece, the inner hexagon bolt 11 is screwed into the inner thread with M16 of the center pull rod 4, and the torque wrench is used for screwing the required torque according to the required torque.

And after the workpiece is machined, loosening the inner hexagon bolt by using a wrench until the inner hexagon bolt is completely screwed out of the internal thread of the central pull rod. And (4) taking down the hexagon socket head cap screw and the circular taper gland, then taking down the workpiece, and reinstalling the next workpiece.

Claims

1. A tie rod clamp for an index head having an index head base, a chuck and 3 jaws disposed on the chuck, characterized in that: the pull rod clamp comprises a central pull rod, a rear end cover plate and a gland; the rear end cover plate is fixed on the rear end surface of the dividing head base; the center pull rod penetrates through a center through hole of the dividing head base, the front end of the center pull rod is positioned in the center of the chuck and provided with a connecting hole with internal threads, and the rear end of the center pull rod is connected with the rear end cover plate; the gland compresses tightly the outside of the workpiece to be processed, and the screw rod part of a bolt fixes the gland and the front end connecting hole of the central pull rod in a threaded manner through the central hole of the gland.

2. The tie bar clamp for an index head of claim 1, wherein: the connecting structure between the rear end of the central pull rod and the rear end cover plate is characterized in that a hole which is sleeved on the central pull rod is formed in the center of the rear end cover plate, external threads are formed in the rear end portion of the central pull rod and extend out of the hole in the rear end cover plate, and the rear end of the central pull rod is limited on the rear end cover plate through a nut.

3. The tie bar clamp for an index head of claim 2, wherein: the nut is a self-locking nut.

4. The tie bar clamp for an index head of claim 1, wherein: the rear end cover plate is fixed with the rear end face of the dividing head base through 3-6 screws.

5. The tie bar clamp for an index head of claim 3, wherein: the rear end cover plate is fixed with the rear end face of the dividing head base through 4 screws.

6. The tie bar clamp for an index head of claim 1, wherein: and a drain hole is formed in the rear end cover plate.

7. The tie bar clamp for an index head of claim 6, wherein: the number of the drain holes is 8.

8. The tie bar clamp for an index head of claim 1, wherein: the gland is a circular taper gland, and the middle thickness of the gland is greater than the peripheral thickness.