CN218192631U

CN218192631U - Expanding mandrel

Info

Publication number: CN218192631U
Application number: CN202221729542.9U
Authority: CN
Inventors: 秦志恒; 黄振孜; 刘孟军; 张丽娟; 郭宁荣; 王卫敏; ***; 黄振宇
Original assignee: Jiangxi Hongdu Aviation Industry Group Co Ltd
Current assignee: Jiangxi Hongdu Aviation Industry Group Co Ltd
Priority date: 2022-07-05
Filing date: 2022-07-05
Publication date: 2023-01-03
Anticipated expiration: 2032-07-05

Abstract

The utility model discloses an expanding mandrel, including spring housing, dabber, pull rod, nut and gasket, the spring housing inner wall is the internal conical surface, dabber minor diameter end outer wall is the external conical surface with spring housing internal conical surface assorted, pull rod one end passes the locking through-hole in spring housing and dabber middle part from the right side to left side in proper order, and expose outside the dabber other end terminal surface, gasket and nut cup joint in the pull rod and expose the end, pull rod other end terminal surface and the laminating of spring housing right-hand member terminal surface, dabber one end cup joints with the internal conical surface of spring housing through its external conical surface, the spring housing face of cylinder cup joints with section of thick bamboo class part, the dabber other end is fixed in on the chuck of lathe; the utility model has the advantages that: effectively solves the problems of material waste and low efficiency.

Description

Expanding mandrel

Technical Field

The utility model belongs to the appurtenance field, it is specific, relate to an expansion core axle.

Background

Most of parts of hydraulic system products are rotary cylinder type parts, and with the development of mechanical products towards the direction of integrated design, some structural parts, such as: the appearance characteristics of parts such as the outer barrel and the strut are more, and the end is not favorable for clamping and fixing in the turning or grinding process. In the past, a process patch is usually left at the end of a part, and after the finish machining of the part is finished, the process patch is removed by a miller and a bench worker, so that the method not only wastes materials and labor cost, but also has low efficiency.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned prior art, the utility model aims to overcome not enough among the prior art, adapt to reality needs to in the processing procedure in the past can be solved a section of thick bamboo part, the technology mends the piece because of the clamping needs leaves, leads to the material extravagant and the dabber that rises of inefficiency scheduling problem.

In order to realize the purpose, the utility model discloses a technical scheme be: the expanding mandrel comprises a spring sleeve, a mandrel, a pull rod, a nut and a gasket, wherein the pull rod and the mandrel are of a T-shaped revolving body structure; the middle part of the mandrel is provided with a stop through hole for a pull rod to pass through, the spring sleeve is of a hollow revolving body structure, the inner wall of the spring sleeve is an inner conical surface, the outer wall of the spring sleeve is a cylindrical surface, grooves convenient for the spring sleeve to expand are uniformly and axially distributed on the cylindrical surface, the outer wall of the small-diameter end of the mandrel is an outer conical surface matched with the inner conical surface of the spring sleeve, one end of the pull rod sequentially passes through the stop through holes in the middle parts of the spring sleeve and the mandrel from right to left and is exposed out of the end surface of the other end of the mandrel, a gasket and a nut are sleeved at the exposed end of the pull rod, the end surface of the other end of the pull rod is attached to the end surface of the right end of the spring sleeve, one end of the mandrel is sleeved with the inner conical surface of the spring sleeve through the outer conical surface, the other end of the mandrel is fixed on a chuck of a machine tool, when the nut is tightened, the pull rod moves towards the mandrel, so as to drive the spring sleeve to move leftwards relative to the mandrel, the spring sleeve expands, the outer diameter of the spring sleeve increases, and the cylindrical surface of the inner hole of the spring sleeve is attached to the cylindrical surface of the cylindrical part and is fixed.

Further, the outer diameter of the spring sleeve is 0.2-0.3mm smaller than the diameter of the clamping inner hole of the cylinder part.

Furthermore, the spring housing is an expandable conical spring housing and is made of stainless steel or spring steel.

Further, the inclination direction of the outer conical surface of the mandrel is gradually reduced from the large-diameter end of the mandrel to the outer diameter, and the taper of the outer conical surface is 4 degrees.

Furthermore, the small-diameter end of the inner conical surface of the spring sleeve gradually moves from the small-diameter end of the outer conical surface of the mandrel and then is sleeved on the large-diameter end of the outer conical surface of the mandrel, so that the expansion of the spring sleeve is realized.

Furthermore, the relative position of the mandrel and the spring sleeve moves by 1mm, and the outer diameter of the spring sleeve changes by 0.07mm.

Furthermore, a locking lug is further arranged on the outer wall of one end of the pull rod, a locking groove matched with the locking lug is further formed in the middle of the mandrel in an outward extending mode along the diameter direction of the locking through hole, and when the nut and the pull rod are screwed down, one end of the pull rod moves leftwards along the locking groove to drive the spring sleeve to move towards the root of the mandrel.

Further, the outer diameter of the large-diameter end of the pull rod is larger than the diameter of the spring sleeve.

Furthermore, the stop lug is arranged on the outer wall of the small-diameter end of the pull rod.

Furthermore, the pull rod sequentially penetrates through the spring sleeve and the stop through hole in the middle of the mandrel from right to left through the small-diameter end, the end face of the other end of the mandrel is exposed out of the end face, and the end face of the large-diameter end of the pull rod is attached to the end face of the right end of the spring sleeve.

The utility model discloses in, in proper order with spring housing, mandrel cluster to the pull rod on, the locking auricle cooperatees with the locking groove, fixed dabber, when screwing up nut and pull rod, the pull rod moves left along the locking groove, drives the spring housing and removes to the dabber root, and the external conical surface of dabber cooperatees with the interior conical surface of spring housing, when the relative dabber of spring housing moves left, the spring housing rises, and the external diameter grow pastes tightly with the part hole for it is together fixed with the part to rise the dabber frock. The machine tool chuck is clamped on the clamping and clamping surface of the mandrel for processing, and a process boss specially used for clamping does not need to be reserved on the part blank.

The utility model has the advantages that: through repeated practice, the expansion mandrel auxiliary tool is suitable for clamping and positioning large and medium-sized cylinder parts and is also suitable for clamping and positioning small parts such as bushings. Effectively solves the problems of material waste and low efficiency.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the exploded structure of the present invention;

fig. 3 is a schematic structural view of the spring housing of the present invention;

fig. 4 is a schematic structural view of the mandrel of the present invention;

FIG. 5 is a schematic view of the structure of the pull rod of the present invention;

fig. 6 is a schematic view of the present invention.

Wherein, 1 is a nut, 2 is a gasket, 3 is a mandrel, 4 is a spring sleeve, 5 is a pull rod, 6 is a stop groove, 7 is an external conical surface, 8 is an internal conical surface, 9 is a stop lug, 10 is a cylindrical surface, 11 is a machine tool clamping surface, 12 is a stop surface, 13 is a cylinder part, 14 is a tailstock jacking position, and 15 is a stop through hole.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It should be understood that the description herein is provided for illustration and explanation of the invention and is not intended to limit the invention.

In the description of the present application, it is to be understood that the terms "left", "right", "inside", "outside", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and operate, and thus, should not be construed as limiting the present application.

As shown in fig. 1 to 6, the utility model provides an expanding mandrel, which comprises a spring sleeve 4, a mandrel 3, a pull rod 5, a nut 1 and a gasket 2, wherein the pull rod 5 and the mandrel 3 are both a T-shaped revolving body structure; the middle of the mandrel 3 is provided with a stop through hole 15 for a pull rod to pass through, the spring sleeve 4 is of a hollow revolving body structure, the inner wall of the spring sleeve 4 is of an inner conical surface 8 structure, the outer wall is of a cylindrical surface 10 structure, grooves convenient for the spring sleeve 4 to expand are uniformly distributed on the cylindrical surface 10 in the circumferential direction, the outer wall of the small diameter end of the mandrel 3 is of an outer conical surface 7 structure matched with the inner conical surface 8 of the spring sleeve 4, one end of the pull rod 5 sequentially passes through the stop through holes 15 in the middle of the spring sleeve 4 and the mandrel 3 from right to left and exposes the end surface of the other end of the mandrel 3, the gasket 2 and the nut 1 are sleeved on the exposed end of the pull rod 5, the end surface of the other end of the pull rod 5 is attached to the end surface of the right end of the spring sleeve 4, one end of the mandrel 3 is sleeved with the inner conical surface 8 of the spring sleeve 4 through the outer conical surface 7, the spring sleeve 4 is sleeved with the barrel part 13 through the cylindrical surface 10 on the outer wall, the other end of the mandrel 3 is fixed on a chuck of a machine tool, when the nut 1 is screwed, the pull rod 5 moves leftwards, and the spring sleeve 4 moves leftwards, the outer diameter of the spring sleeve 4 becomes larger diameter and the inner hole of the inner bore part 13 is fixed.

Preferably, the outer diameter of the spring sleeve 4 is 0.2-0.3mm smaller than the diameter of the clamping inner hole of the cylinder part 13.

Preferably, the spring housing 4 is an expandable conical spring housing and is made of stainless steel or spring steel.

Preferably, the outer tapered surface 7 of the mandrel 3 is inclined in a direction that the diameter gradually decreases from the large diameter end of the mandrel 3 to the outer diameter, and the taper of the outer tapered surface 7 is 4 °.

Preferably, the spring housing 4 is sleeved on the large-diameter end of the outer conical surface 7 of the mandrel 3 after gradually moving from the small-diameter end of the outer conical surface 7 of the mandrel 3 through the small-diameter end of the inner conical surface 8 of the spring housing to expand.

Preferably, the relative position of the mandrel 3 and the spring sleeve 4 is moved by 1mm, and the outer diameter of the spring sleeve 4 is changed by 0.07mm.

Preferably, the outer wall of one end of the pull rod 5 is further provided with a stop lug 9, the middle of the mandrel 3 further extends outwards along the diameter direction of the stop through hole 15 to form a stop groove 6 matched with the stop lug 9, and when the nut 1 and the pull rod 5 are screwed down, one end of the pull rod 5 moves leftwards along the stop groove 6 to drive the spring sleeve 4 to move towards the root of the mandrel 3.

Preferably, the outer diameter of the large-diameter end of the pull rod 5 is larger than the hole diameter of the spring sleeve 4.

Preferably, the stop lug 9 is arranged on the outer wall of the small-diameter end of the pull rod 5.

Preferably, one end of the pull rod 5 sequentially penetrates through the spring sleeve 4 and the stop through hole 15 in the middle of the mandrel 3 from right to left through the small-diameter end of the pull rod, and is exposed out of the end face of the other end of the mandrel 3, and the other end of the pull rod 5 is attached to the end face of the right end of the spring sleeve 4 through the end face of the large-diameter end of the pull rod.

The utility model discloses a course of working does:

(1) and processing the spring sleeve 4: as shown in fig. 3, the outer diameter of the spring sleeve 4 is determined according to the inner hole of the produced barrel-type part 13, and usually, the outer diameter of the spring sleeve 4 is preferably 0.2-0.3mm smaller than the part clamping inner hole, so that the spring sleeve 4 can be easily placed into the part inner hole, and the area of the binding surface of the spring sleeve 4 and the inner hole when the spring sleeve is expanded is ensured, thereby achieving the purpose of firm clamping, and the spring sleeve 4 is preferably made of stainless steel or spring steel;

(2) and a processing mandrel 3: as shown in fig. 4, the taper of the outer conical surface 7 of the mandrel 3 is preferably 4 degrees, the relative position of the mandrel 3 and the spring sleeve 4 moves by 1mm, and the outer diameter of the spring sleeve 4 changes by 0.07mm, so that the mandrel 3 and the spring sleeve 4 can be firmly clamped with a part within the relative movement range of 5mm, and in order to ensure that the nut 1 is screwed, the pull rod 5 cannot move circumferentially, and the stop groove 6 is added;

(3) and a processing pull rod 5: as shown in fig. 5, the pull rod 5 is machined and the stop tab 9 feature of the pull rod 5 is machined in conjunction with the size of the stop slot 6 of the mandrel 3.

The utility model discloses a theory of operation does: the nut 1 is screwed tightly, the pull rod 5 is tightened, the spring sleeve 4 moves relative to the mandrel 3 to expand, so that the cylindrical surface 10 of the spring sleeve is tightly attached to the inner hole of the barrel part 13, the purpose of clamping and fixing the expanding mandrel and the barrel part 13 is achieved, the outer circle of the large-diameter end of the mandrel 3 is a machine tool clamping surface 11, the end surface of the joint between the large-diameter end and the small-diameter end of the mandrel 3 is a stopping surface 12, one end of the barrel part 13, far away from the expanding mandrel, is a tailstock jacking position 14, after the expanding mandrel and the barrel part 13 are fixed, one end of the expanding mandrel is clamped on a clamping jaw of a machine tool through the machine tool clamping surface 11 on the mandrel 3, the other end of the expanding mandrel part is jacked at the tailstock jacking position 14 of the end of the barrel part 13, so that the barrel part 13 is prevented from moving axially to cause reference deviation, and when the mandrel is clamped, the end head of the barrel part 13 and the expanding connecting end of the expanding mandrel is tightly attached to a stopping surface 12 (shown in figure 6).

The foregoing description of the specific embodiments of the invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.

Claims

1. The expanding mandrel is characterized in that: the spring sleeve comprises a spring sleeve (4), a mandrel (3), a pull rod (5), a nut (1) and a gasket (2), wherein the pull rod (5) and the mandrel (3) are both of a T-shaped revolving body structure; the middle of the mandrel (3) is provided with a stop through hole (15) for a pull rod to pass through, the spring sleeve (4) is of a hollow revolving body structure, the inner wall of the spring sleeve (4) is an inner conical surface (8), the outer wall of the spring sleeve is a cylindrical surface (10), grooves convenient for the spring sleeve (4) to expand are uniformly distributed on the cylindrical surface (10) in the circumferential direction, the outer wall of the small-diameter end of the mandrel (3) is an outer conical surface (7) matched with the inner conical surface (8) of the spring sleeve (4), one end of the pull rod (5) sequentially passes through the stop through holes (15) in the middle of the spring sleeve (4) and the mandrel (3) from right to left and exposes out of the end surface of the other end of the mandrel (3), the gasket (2) and the nut (1) are sleeved at the exposed end of the pull rod (5), the end surface of the other end of the pull rod (5) is attached to the end surface of the right of the spring sleeve (4), one end of the mandrel (3) is sleeved with the end surface (8) of the spring sleeve (4) through the outer conical surface (7), the spring sleeve (4) and the spring sleeve (4) is sleeved with the cylindrical surface (10) on the outer wall, the other end of the mandrel (3) and the other end of the mandrel (3) is fixed on a machine tool, when the mandrel is screwed and the mandrel (3) moves towards the chuck (3), the mandrel (3) moves towards the chuck (3), and the mandrel (3) moves towards the chuck (3) relatively, and the mandrel (3), the spring sleeve (4) is expanded, the outer diameter is enlarged, and the cylindrical surface (10) of the spring sleeve (4) is tightly attached to the inner hole of the cylinder part (13) and fixed by the enlarged outer diameter of the spring sleeve (4).

2. The expanding mandrel of claim 1, wherein: the outer diameter of the spring sleeve (4) is smaller than the clamping inner hole diameter of the cylinder part (13) by 0.2-0.3mm.

3. An expanding mandrel according to claim 1, characterised in that: the spring sleeve (4) is an expandable conical spring sleeve and is made of stainless steel or spring steel.

4. The expanding mandrel of claim 1, wherein: the inclined direction of the outer conical surface (7) of the mandrel (3) is gradually reduced from the large-diameter end of the mandrel (3) to the outer diameter, and the taper of the outer conical surface (7) is 4 degrees.

5. The expanding mandrel of claim 1, wherein: the spring sleeve (4) is sleeved on the large-diameter end of the outer conical surface (7) of the mandrel (3) after gradually moving from the small-diameter end of the outer conical surface (7) of the mandrel (3) through the small-diameter end of the inner conical surface (8) of the spring sleeve to expand.

6. The expanding mandrel of claim 1, wherein: the relative position of the mandrel (3) and the spring sleeve (4) moves by 1mm, and the outer diameter of the spring sleeve (4) changes by 0.07mm.

7. The expanding mandrel of claim 1, wherein: the outer wall of one end of the pull rod (5) is further provided with a stop lug (9), the middle of the mandrel (3) extends outwards along the diameter direction of the stop through hole (15) to form a stop groove (6) matched with the stop lug (9), and when the nut (1) and the pull rod (5) are screwed down, one end of the pull rod (5) moves leftwards along the stop groove (6) to drive the spring sleeve (4) to move towards the root of the mandrel (3).

8. The expanding mandrel of claim 1, wherein: the outer diameter of the large-diameter end of the pull rod (5) is larger than the aperture of the spring sleeve (4).

9. The expanding mandrel of claim 7, wherein: the stop lug (9) is arranged on the outer wall of the small-diameter end of the pull rod (5).

10. The expanding mandrel of claim 1, wherein: the pull rod (5) sequentially penetrates through the spring sleeve (4) and the stop through hole (15) in the middle of the mandrel (3) from right to left through the small-diameter end, the end face of the other end of the mandrel (3) is exposed out, and the end face of the large-diameter end of the pull rod (5) is attached to the end face of the right end of the spring sleeve (4).