CN215746864U

CN215746864U - Upper pressing head of hobbing clamp

Info

Publication number: CN215746864U
Application number: CN202121935073.1U
Authority: CN
Inventors: 张光灿; 田耕; 吴序响; 张作勇
Original assignee: Anhui Xingrui Gear Transmission Co ltd
Current assignee: Anhui Xingrui Gear Transmission Co ltd
Priority date: 2021-08-18
Filing date: 2021-08-18
Publication date: 2022-02-08
Anticipated expiration: 2031-08-18

Abstract

The utility model discloses an upper pressure head of a hobbing clamp, which comprises a mandrel, an upper ball block, a lower ball block, an upper gland, a dust cover, a compression spring, steel balls, a stop block and bolts connected among parts. The fixture utilizes spherical surface contact between the upper ball block and the lower ball block, so that the lower ball block and the upper gland have a swing space during working, and incline along with the inclination of the upper end surface of a product, thereby avoiding the over-positioning caused by the deflection of the workpiece; when the workpiece is pressed, the spherical surface can be automatically leveled, so that the lower end surface of the upper gland is tightly attached to the upper end surface of the workpiece to be processed; the problem that the positioning surface of the upper gland of the clamp is not parallel to the positioning surface of the workpiece to be machined after the upper gland is installed and the workpiece is pressed to be deflected in the positioning process can be solved, and therefore the stability of the machining quality of the workpiece is improved.

Description

Upper pressing head of hobbing clamp

Technical Field

The utility model relates to the technical field of machining tool fixtures, in particular to a hydraulic fixture for gear hobbing process machining of a gear.

Background

In automobile and forklift speed reducers, gear hobbing technology is mostly adopted before finish machining procedures. The gear hobbing clamp mainly has two structures, one is gear inner hole positioning and main clamping, and the upper end face is clamped in an auxiliary mode; the other is gear inner hole positioning, and the upper end surface is mainly clamped.

In the gear production process, the parallelism of the upper end surface and the lower end surface of the gear and the perpendicularity of the two end surfaces and the inner hole of the gear cannot be zero, so that the upper end surface of a machined workpiece is over-positioned when being pressed tightly, the center of the workpiece is pressed to be deviated, the accuracy of the gear hobbing is unstable, and the gear hobbing has influence on the subsequent process or is directly unqualified and discarded.

When the duplex gear of a certain transmission is subjected to gear hobbing in batch production, the accuracy of the gear at the upper end is more obvious, and the subsequent process machining and the product percent of pass are seriously influenced. Therefore, there is a need to design an upper ram that eliminates over-positioning.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide the upper pressing head of the hobbing clamp, so that the design problem of the upper pressing head of the hobbing clamp is solved, the workpiece center is prevented from being pressed, and the clamping precision and the product quality are improved.

The upper pressing head of the hobbing clamp comprises a mandrel, an upper ball block, a lower ball block and an upper pressing cover, wherein the upper part of the mandrel is a cone and is connected with a tail frame of a processing machine tool; the middle part of the mandrel is provided with a shaft sleeve part for installing and positioning the upper ball block; and a second internal thread hole is formed in the bottom of the mandrel and used for fixing the stop block.

The upper ball block is a hollow cylinder, is sleeved at the shaft sleeve part and is connected with the mandrel; the lower end surface of the upper ball block is a hemisphere surface I; the lower ball block is a hollow stepped shaft, is sleeved at the shaft sleeve part and is positioned between the upper ball block and the stop block, the upper end surface of the lower ball block is a hemispherical surface two, and the upper gland is arranged at the bottom of the lower ball block and is used for compressing a workpiece to be processed.

The lower ball block is in clearance fit with the mandrel, the second hemispherical surface is matched with the first hemispherical surface, and a plurality of compression springs are arranged between the lower ball block and the stop block, so that the upper gland rotates relative to the mandrel along with the inclination of the upper end surface of the workpiece, and the workpiece is prevented from being positioned excessively.

Furthermore, a plurality of threaded holes III are formed in the shaft shoulder in the middle of the lower ball block, a plurality of through holes are formed in the upper portion of the upper gland, and bolts penetrate through the through holes and the threaded holes III to enable the upper gland to be connected with the lower ball block through bolts.

Furthermore, the mandrel and the outer side of the upper ball block are provided with dust covers for preventing iron chips and dust from entering the first hemispherical surface during working.

Furthermore, a plurality of hemispherical grooves are formed in the upper portion of the stop block, steel balls are arranged in the hemispherical grooves, and one end of the compression spring is in contact with the steel balls.

Furthermore, a plurality of spring mounting holes used for mounting the compression springs are formed in the bottom of the lower ball block, and the spring mounting holes are evenly distributed in the circumferential direction.

Further, the shaft sleeve part is matched with the small clearance H7/H6 of the inner hole of the upper ball block.

Further, the shaft sleeve part is in clearance fit with the lower ball block, and the clearance is not less than 0.1 mm.

Furthermore, the top of the mandrel is provided with a first threaded hole, and the mandrel is fixed on the tailstock of the machine tool through the first threaded hole.

Furthermore, a plurality of step holes are formed in the shaft shoulder in the middle of the mandrel, and bolts penetrate through the step holes to enable the upper ball block to be connected with the mandrel.

According to the upper pressure head of the hobbing clamp, provided by the utility model, through the spherical sliding between the upper ball block and the lower ball block, the lower ball block and the upper pressure cover have a swinging space during working and incline along with the inclination of the upper end surface of a product, so that the phenomenon that the workpiece is pressed to be deflected to generate over-positioning is avoided; the problem that the positioning surface of the upper gland of the clamp is not parallel to the positioning surface of the workpiece to be machined after the upper gland is installed and the workpiece is pressed to be deflected in the positioning process can be solved, and therefore the stability of the machining quality of the workpiece is improved.

In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:

FIG. 1 is a schematic view of the configuration of the upper ram of the hobbing fixture of the present invention;

FIG. 2 is a schematic structural view of a central spindle of an upper pressure head of the hobbing fixture of the present invention;

FIG. 3 is a schematic structural view of an upper ball block in the upper pressure head of the hobbing fixture of the present invention;

fig. 4 is a schematic structural diagram of a lower ball block in an upper pressure head of the hobbing clamp.

Description of the reference numerals

1. A mandrel; 2. a dust cover; 3. a ball block is arranged; 4. a ball feeding block; 5. a compression spring; 6. steel balls; 7. a stopper; 8. a gland is arranged; 9. a workpiece to be processed; 10. a lower assembly of the hobbing clamp; 11. a first threaded hole; 12. a stepped bore; 13. a boss portion; 14. a cone; 15. a second threaded hole; 31. a hemisphere surface I; 41. a lower ball block sleeve part; 42. a third threaded hole; 43. and a spring mounting hole.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 1, the upper pressing head of the hobbing fixture comprises a mandrel 1, a dust cap 2, an upper ball block 3, a lower ball block 4, a compression spring 5, a steel ball 6, a stop dog 7, an upper pressing cover 8 and bolts connected among all parts of the fixture, and is used for pressing a workpiece 9 to be machined in a balanced manner. Wherein, the workpiece 9 to be processed is arranged on the lower component 10 of the hobbing clamp; the upper pressure head is matched with the lower component 10 of the hobbing clamp to complete the positioning and clamping of the workpiece 9 to be processed.

Specifically, as shown in fig. 2, the upper portion of the mandrel 1 is a cone 14, a plurality of stepped holes 12 are formed in the middle shoulder of the mandrel 1, and a sleeve portion 13 is formed in the lower portion of the mandrel 1. And a second threaded hole 15 is formed in the bottom of the mandrel 1 and used for installing a bolt fixing stop 7. The cone 14 is matched and positioned with an inner conical surface of a tail frame of the processing machine tool and is fixed on the tail frame of the processing machine tool through the first threaded hole 11.

As shown in fig. 1 and 3, the upper ball block 3 is a hollow cylinder, is sleeved on the sleeve portion 13, and passes through the stepped hole 12 through a bolt to connect the upper ball block 3 and the core shaft 1 together. Wherein, the lower end surface of the upper ball block 3 is a hemisphere surface one 31.

As shown in fig. 1 and 4, the lower ball block 4 is a hollow stepped shaft, and is sleeved at the position of the shaft sleeve part 13; the upper end surface of the lower ball block 4 is a hemisphere surface II which is matched with a hemisphere surface I31 on the upper ball block 3, so that high-precision fitting is realized, and the lower ball block 4 and the upper ball block 3 can rotate in a spherical surface with a small angle.

Meanwhile, a plurality of threaded holes III 42 are formed in the shaft shoulder in the middle of the lower ball block 4, a plurality of spring mounting holes 43 are formed in the bottom of the lower ball block 4, and the spring mounting holes 43 are evenly distributed in the circumferential direction. The upper gland 8 can be mounted at the bottom of the lower ball block 4 by bolts passing through the third screw hole 42. The upper part of the upper gland 8 is provided with a plurality of through holes which are sleeved on the lower ball block shaft sleeve part 41 and are connected with the lower ball block 4 by bolts.

The stop 7 is arranged at the bottom outer side of the mandrel 1 and the lower ball block 4, and the stop 7 is connected with the mandrel 1 through a bolt. Wherein, be equipped with compression spring 5 and steel ball 6 between dog 7 and the lower ball piece 4, compression spring 5 is located spring mounting hole 43. The upper part of the stop block 7 is provided with a plurality of hemispherical grooves for limiting the steel balls 6.

The compression spring 5 and the steel ball 6 are arranged in the spring mounting hole 43 of the lower ball block 4 and the hemispherical groove of the stop block 7. The compression spring is stressed uniformly when the upper pressure head works, the spherical surface between the upper ball block 3 and the lower ball block 4 is well attached, and the upper end surface of the product inclines along with the inclination of the upper end surface of the product, so that the over-positioning is avoided.

When the automatic centering device works, the upper end surface of the workpiece is automatically centered by sliding the hemispherical surface I31, so that the workpiece 9 to be machined is pressed in a balanced manner. The center of the workpiece cannot be inclined after being pressed.

Wherein, the shaft sleeve part 13 is matched with the small clearance H7/H6 in the inner hole of the upper ball block 3. The shaft sleeve part 13 is in clearance fit with the lower ball block 4, and the clearance is not less than 0.1mm, so that the lower ball block 4 and the upper gland 8 have a swing space during working.

As shown in figure 1, the dust cap 2 is sleeved between the mandrel 1 and the upper ball block 3 and used for preventing iron chips and dust from entering the first hemispherical surface 31 at the bottom of the upper ball block 3 during work.

The working principle and the working process of the utility model are briefly described below with reference to the accompanying drawings.

Through the spherical sliding between the upper ball block and the lower ball block, the lower ball block and the upper gland have a swinging space during working, and incline along with the inclination of the upper end surface of a product, so that the phenomenon that the workpiece is pressed to be deflected to generate over-positioning is avoided; the problem that the positioning surface of the upper gland of the clamp is not parallel to the positioning surface of the workpiece to be machined after the upper gland is installed and the workpiece is pressed to be deflected in the positioning process can be solved, and therefore the stability of the machining quality of the workpiece is improved.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An upper pressure head of a hobbing clamp is characterized by comprising a mandrel (1), an upper ball block (3), a lower ball block (4) and an upper gland (8),

the upper part of the mandrel (1) is provided with a cone (14) which is connected with a tail frame of a processing machine tool; the middle part of the mandrel (1) is provided with a shaft sleeve part (13) for installing and positioning the upper ball block (3); the bottom of the mandrel (1) is provided with a second internal thread hole (15) for fixing the stop block (7);

the upper ball block (3) is a hollow cylinder, is sleeved at the shaft sleeve part (13) and is connected with the mandrel (1); the lower end surface of the upper ball block (3) is a hemispherical surface I (31);

the lower ball block (4) is a hollow stepped shaft, is sleeved at the shaft sleeve part (13) and is positioned between the upper ball block (3) and the stop block (7), the upper end surface of the lower ball block (4) is a hemispherical surface II,

the upper gland (8) is arranged at the bottom of the lower ball block (4) and is used for compressing a workpiece (9) to be processed;

the lower ball block (4) is in clearance fit with the mandrel (1), the second hemispherical surface is matched with the first hemispherical surface (31), and a plurality of compression springs (5) are arranged between the lower ball block (4) and the stop block (7), so that the upper gland (8) rotates relative to the mandrel (1) along with the inclination of the upper end surface of a workpiece, and the workpiece is prevented from being positioned excessively.

2. The upper pressure head of the hobbing clamp according to claim 1, characterized in that a plurality of threaded holes III (42) are formed in the middle shaft shoulder of the lower ball block (4), a plurality of through holes are formed in the upper portion of the upper pressure cover (8), and the upper pressure cover (8) is in bolted connection with the lower ball block (4) through bolts penetrating through the through holes and the threaded holes III (42).

3. The upper pressure head of the hobbing clamp according to claim 1, characterized in that dust covers (2) are arranged on the outer sides of the mandrel (1) and the upper ball block (3) and used for preventing scrap iron and dust from entering the first hemispherical surface (31) during work.

4. The upper pressure head of the hobbing clamp according to claim 1, characterized in that a plurality of hemispherical grooves are formed in the upper part of the stop block (7), steel balls (6) are arranged in the hemispherical grooves, and one end of the compression spring (5) is in contact with the steel balls (6).

5. The upper pressure head of the hobbing clamp according to claim 1, characterized in that a plurality of spring mounting holes (43) for mounting the compression springs (5) are formed in the bottom of the lower ball block (4), and the spring mounting holes (43) are uniformly distributed in the circumferential direction.

6. The upper jaw of a hobbing clamp according to claim 1, characterized in that the boss (13) fits with a small clearance H7/H6 in the inner hole of the upper ball (3).

7. The upper jaw of a hobbing clamp according to claim 1, characterized in that the boss (13) is clearance fitted with the lower ball (4), the clearance being not less than 0.1 mm.

8. The upper pressure head of the hobbing clamp according to claim 1, characterized in that a first threaded hole (11) is formed in the top of the mandrel (1), and the mandrel (1) is fixed on a tail frame of a machine tool through the first threaded hole (11).

9. The upper pressure head of the hobbing clamp according to claim 1, characterized in that a plurality of stepped holes (12) are formed in the middle shoulder of the mandrel (1), and bolts are passed through the stepped holes (12) to connect the upper ball block (3) and the mandrel (1).