Cylindrical grinding positioning telescopic center

Abstract

The utility model provides a cylindrical grinding positioning telescopic center, and belongs to the technical field of machine tool tools. The problem that a tip abutting against one end of a workpiece on an existing grinding machine cannot be adjusted according to the situation that center holes of the workpiece are different in size is solved. The cylindrical grinding positioning telescopic center comprises a center outer shaft internally provided with a sliding center, a bearing outer sleeve for installing the center outer shaft is arranged outside the center outer shaft, a workpiece end face positioning block attached to the end face of a workpiece is assembled at the front end of the bearing outer sleeve, and the sliding center axially slides along the inner wall of the center outer shaft to adjust the axial distance of the sliding center. The front end of the sliding tip is of a conical structure and is correspondingly matched with a center hole of a workpiece, a spring part for the sliding tip to abut against is arranged in the tip outer shaft and located at the rear end of the sliding tip, and the tail of the tip outer shaft is fixedly connected with a tail spring fixing block for limiting the spring part inside. The utility model has the advantages of ensuring gapless fitting of workpieces, and being wide in application range and good in use effect.

Description

Technical Field

[0001] The utility model belongs to the technical field of machine tools and relates to an ejector pin, in particular to an external cylindrical grinding positioning telescopic ejector pin. Background Art

[0002] The grinder needs to position the workpiece before grinding it. It usually uses special tooling and fixed centers to be set at both ends of the workpiece, and clamps both ends of the workpiece to complete the positioning.

[0003] In the actual field of grinding machine processing, we found that due to the different specifications of the workpiece, the size of the center hole of the workpiece will also be different, and the current grinder cannot efficiently position workpieces of different specifications. Each workpiece requires a special tooling design to correspond, which is very inconvenient and increases the processing cost; in addition, the current tooling has low flatness after clamping the workpiece. Specifically, the verticality formed between the end face of the tooling and the outer circle of the workpiece, as well as the parallelism formed between the end face of the tooling and the end face of the workpiece, are low in accuracy, and it is precisely this accuracy requirement that is more demanding in this field.

[0004] Therefore, in order to ensure the production accuracy of the product, we designed an external cylindrical grinding positioning telescopic center to solve the above problems. Summary of the invention

[0005] The utility model aims to solve the above problems existing in the prior art and provides a cylindrical grinding positioning telescopic center which ensures seamless fitting of workpieces and has a wide range of uses and good effects.

[0006] The objectives of the utility model can be achieved through the following technical solutions: A cylindrical grinding positioning telescopic center, characterized in that it includes a center outer shaft with a built-in sliding center, the outside of the center outer shaft is provided with a bearing sleeve for its installation, the front end of the bearing sleeve is equipped with a workpiece end face positioning block that fits with the end face of the workpiece, the sliding center slides axially along the inner wall of the center outer shaft to adjust the axial distance of the sliding center itself, the front end of the sliding center is a conical structure and corresponds to the center hole of the workpiece, a spring member for the sliding center to abut is provided inside the center outer shaft and at the rear end of the sliding center, and the tail of the center outer shaft is fixedly connected to a tail spring fixing block that limits the spring member inside.

[0007] In the above-mentioned external cylindrical grinding positioning telescopic center, a plurality of angular contact paired bearings are arranged between the bearing sleeve and the center outer shaft.

[0008] In the above-mentioned cylindrical grinding positioning telescopic center, the rear end of the bearing outer sleeve is fixedly connected to the bearing outer ring pressure cover.

[0009] In the above-mentioned external cylindrical grinding positioning telescopic center, the center outer shaft is connected with a locking nut, and a bearing locking washer is provided between the locking nut and the angular contact matching bearing.

[0010] In the above-mentioned external cylindrical grinding positioning telescopic center, an oil seal is provided between the center outer shaft and the bearing sleeve.

[0011] In the above-mentioned external cylindrical grinding positioning telescopic center, a waist-shaped groove is provided on the sliding center, an opening is provided on the outer shaft of the center at a position corresponding to the waist-shaped groove, and a single-head threaded pin entering the waist-shaped groove is inserted into the opening.

[0012] Compared with the prior art, the external cylindrical grinding positioning telescopic center has the following advantages: the sliding center can be axially extended and retracted according to the size of the center hole, thereby adapting to workpieces of different sizes, ensuring seamless fit of the workpieces and having a wide range of uses and good use effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional diagram of the positioning telescopic center of the external cylindrical grinding machine.

[0014] Figure 2 It is a cross-sectional view of the positioning telescopic center of the external cylindrical grinding machine.

[0015] In the figure, 1. sliding center; 2. center outer shaft; 3. bearing sleeve; 4. workpiece end face positioning block; 5. spring part; 6. tail spring fixing block; 7. angular contact paired bearing; 8. bearing outer ring pressure cover; 9. locking nut; 10. bearing locking washer; 11. oil seal; 12. waist groove; 13. single-head threaded pin. DETAILED DESCRIPTION

[0016] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0017] like Figure 1 , Figure 2 As shown, the external cylindrical grinding positioning telescopic center comprises a center outer shaft 2 with a built-in sliding center 1, a bearing sleeve 3 for its installation is provided on the outside of the center outer shaft 2, a workpiece end face positioning block 4 which fits the end face of the workpiece without a gap is mounted on the front end of the bearing sleeve 3, the sliding center 1 slides axially along the inner wall of the center outer shaft 2 to adjust the axial distance of the sliding center 1 itself, the front end of the sliding center 1 is a conical structure and corresponds to the center hole of the workpiece, a spring member 5 for the sliding center 1 to abut is provided inside the center outer shaft 2 and at the rear end of the sliding center 1, and the tail of the center outer shaft 2 is fixedly connected to a tail spring fixing block 6 which limits the spring member 5 inside.

[0018] During operation, positioning is achieved by utilizing the cooperation between the sliding center 1 and the center hole of the workpiece. When the center holes are of different sizes, the conical structure on the top of the sliding center 1 is adapted to the corresponding center hole according to the corresponding center hole size. The sliding center 1 is telescopically self-adjusted under the action of the spring member 5, so that the workpiece end face positioning block 4 fits the end face of the workpiece without a gap, thereby ensuring the parallelism between the two end faces and the verticality of the end face of the workpiece end face positioning block 4 and the outer circle of the workpiece when grinding the outer circle.

[0019] To elaborate further, a plurality of angular contact paired bearings 7 are provided between the bearing sleeve 3 and the top outer shaft 2. The selected paired angular contact ball bearings can bear radial and axial loads at the same time, thereby improving the durability and stability of the sliding top 1.

[0020] Preferably, a bearing outer ring gland 8 is fixedly connected to the rear end of the bearing sleeve 3 .

[0021] Preferably, the top outer shaft 2 is connected with a locking nut 9 , and a bearing locking washer 10 is provided between the locking nut 9 and the angular contact paired bearing 7 .

[0022] To further elaborate, an oil seal 11 is provided between the top outer shaft 2 and the bearing sleeve 3 to prevent water and other liquids from entering the angular contact paired bearing 7.

[0023] To elaborate further, a waist-shaped groove 12 is provided on the sliding center 1, and an opening is provided on the center outer shaft 2 at a position corresponding to the waist-shaped groove 12, and a single-head threaded pin 13 is inserted into the opening and enters the waist-shaped groove 12 to prevent the sliding center 1 from rotating radially.

[0024] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0025] Although this article uses more terms such as sliding top 1, top outer shaft 2, bearing sleeve 3, workpiece end face positioning block 4, spring member 5, tail spring fixing block 6, angular contact paired bearing 7, bearing outer ring gland 8, locking nut 9, bearing locking washer 10, oil seal 11, waist groove 12, single-head threaded pin 13, etc., it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A cylindrical grinding positioning telescopic center, characterized in that: The invention comprises a top outer shaft (2) having a sliding top (1) built therein, a bearing sleeve (3) for mounting the top outer shaft (2) being provided on its exterior, a workpiece end face positioning block (4) being mounted on the front end of the bearing sleeve (3), the sliding top (1) sliding axially along the inner wall of the top outer shaft (2) for adjusting the axial distance of the sliding top (1) itself, the front end of the sliding top (1) being a conical structure and correspondingly matched with the center hole of the workpiece, a spring member (5) for the sliding top (1) to abut against being provided inside the top outer shaft (2) and at the rear end of the sliding top (1), the tail of the top outer shaft (2) being fixedly connected with a tail spring fixing block (6) for limiting the spring member (5) inside.

2. The external cylindrical grinding positioning telescopic center according to claim 1, characterized in that: A plurality of angular contact paired bearings (7) are provided between the bearing sleeve (3) and the top outer shaft (2).

3. The external cylindrical grinding positioning telescopic center according to claim 1, characterized in that: The rear end of the bearing outer sleeve (3) is fixedly connected to a bearing outer ring pressure cover (8).

4. The external cylindrical grinding positioning telescopic center according to claim 1, characterized in that: The top outer shaft (2) is connected to a locking nut (9), and a bearing locking washer (10) is provided between the locking nut (9) and the angular contact matching bearing (7).

5. The external cylindrical grinding positioning telescopic center according to claim 1, characterized in that: An oil seal (11) is provided between the top outer shaft (2) and the bearing sleeve (3).

6. The external cylindrical grinding positioning telescopic center according to claim 1, characterized in that: The sliding top (1) is provided with a waist-shaped groove (12), and the top outer shaft (2) is provided with an opening at a position corresponding to the waist-shaped groove (12), and a single-head threaded pin (13) is inserted into the opening and enters the waist-shaped groove (12).

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