Positioning tool for spliced shaft sleeve

Abstract

The positioning tool comprises a positioning sleeve and an expansion mold, the positioning sleeve is of a cylindrical structure, a through hole is formed in the center of the bottom face of the positioning sleeve, and the expansion mold comprises an upper conical mold body and a lower conical mold body. The upper conical mold and the lower conical mold are pressed in from the upper opening and the lower opening of the positioning sleeve respectively so that the outer diameter of the positioning sleeve can be evenly enlarged, the upper conical mold and the lower conical mold are each of a circular truncated cone structure, positioning grooves or positioning columns are arranged on the small-diameter bottom faces of the upper conical mold and the lower conical mold respectively, and threaded holes are formed in the centers of the bottom faces of the upper conical mold and the lower conical mold. The upper conical mold and the lower conical mold are pressed in from the upper opening and the lower opening of the positioning sleeve, so that the outer diameter of the positioning sleeve is uniformly expanded until the outer circle of the positioning sleeve is attached to the inner wall of a through hole in a part; the positioning sleeve is expanded and shrunk through stroke changes of the upper conical surface mold and the lower conical surface mold, and therefore positioning and demolding are achieved.

Description

Technical Field

[0001] The utility model relates to a positioning tooling for a spliced bushing. Background Art

[0002] The bushing on the body of a press is composed of three parts spliced together. After the inner holes are spliced, boring processing is required, with a machining allowance of 5 mm. If the inner holes of the three parts are not concentric during assembly and there is a dislocation phenomenon, it will cause insufficient machining allowance during subsequent boring, resulting in quality problems. Therefore, it is necessary to ensure that the inner holes of the three parts of the bushing are concentric and coaxial through tooling to improve the assembly accuracy. The traditional centering tooling has high requirements for individual parts. Once there is an error in the inner hole size, the coaxial requirement cannot be guaranteed. Moreover, it is difficult to demold after positioning with the tooling, and the work efficiency is low. Content of the Utility Model

[0003] The purpose of the utility model is to solve the above-mentioned deficiencies of the prior art and provide a positioning tooling for a spliced bushing.

[0004] A positioning tooling for a spliced bushing includes a positioning sleeve and an expansion die. The positioning sleeve is of a cylindrical structure, and a through hole is provided at the center of its bottom surface. The expansion die includes an upper conical die and a lower conical die. The upper conical die and the lower conical die are respectively pressed into the upper opening and the lower opening of the positioning sleeve to uniformly expand the outer diameter of the positioning sleeve.

[0005] Preferably, both the upper conical die and the lower conical die are of a frustum structure, and positioning grooves or positioning posts are respectively provided on the bottom surfaces with smaller diameters.

[0006] Preferably, threaded holes are provided at the centers of the bottom surfaces of the upper conical die and the lower conical die, and the upper conical die and the lower conical die are connected by bolts.

[0007] Preferably, a plurality of outer circles are provided on the outer arc surface of the positioning sleeve, and the outer side surfaces of the outer circles are used to connect with the inner side walls of the through holes of the parts to be positioned.

[0008] Preferably, a shoulder is provided at the upper end of the outer arc surface of the positioning sleeve, and the outer diameter of the shoulder is larger than the diameter of the through hole on the part to be positioned. The shoulder is used for positioning between the positioning sleeve and the part.

[0009] Preferably, a plurality of through grooves penetrating the side walls are uniformly spaced on the upper end surface and the lower end surface of the positioning sleeve.

[0010] Advantageous Effects: Compared with the prior art, in the utility model, the upper conical die and the lower conical die are pressed into the upper opening and the lower opening of the positioning sleeve, so that the outer diameter of the positioning sleeve is uniformly expanded until the outer circles of the positioning sleeve are in contact with the inner walls of the through holes on the parts. The positioning sleeve realizes expansion and contraction through the stroke change of the upper and lower conical dies, so as to realize positioning and demolding. The positioning sleeve is designed as a hollow structure, which is convenient for its expansion and contraction, and realizes the elastic change of the size of the positioning sleeve. Brief Description of the Drawings

[0011] Figure 1 It is a schematic diagram of the positioning tooling in the bushing;

[0012] Figure 2 It is an exploded view of the positioning tooling;

[0013] Figure 3 It is a sectional view of the assembly structure of the positioning tooling;

[0014] In the figure, 1 is the first bushing, 2 is the partition plate, 3 is the second bushing, 4 is the positioning sleeve, 5 is the upper conical die, 6 is the lower conical die, 7 is the bolt, 8 is the positioning post, and 9 is the positioning groove. Detailed Description of the Preferred Embodiment

[0015] To deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments and drawings. The embodiments are only used to explain the present invention and do not limit the protection scope of the present invention.

[0016] As Figures 1 - 3 shown, the first bushing 1, the partition plate 2, the second bushing 3, the positioning sleeve 4, the upper conical die 5, the lower conical die 6, the bolt 7, the positioning post 8, and the positioning groove 9;

[0017] A positioning tooling for a spliced bushing, comprising a positioning sleeve 4 and an expansion die. The positioning sleeve 4 is of a cylindrical structure, and a through hole is provided at the center of its bottom surface. The expansion die includes an upper conical die 5 and a lower conical die 6. The upper conical die 5 and the lower conical die 6 are respectively pressed into the positioning sleeve 4 from the upper opening and the lower opening to uniformly expand the outer diameter of the positioning sleeve 4.

[0018] In this embodiment, both the upper conical die 5 and the lower conical die 6 are of a frustum structure, and positioning grooves 9 or positioning posts 8 are respectively provided on their smaller-diameter bottom surfaces.

[0019] In this embodiment, threaded holes are provided at the centers of the bottom surfaces of the upper conical die 5 and the lower conical die 6, and the upper conical die 5 and the lower conical die 6 are connected by bolts 7.

[0020] In this embodiment, a plurality of outer circles are provided on the outer arc surface of the positioning sleeve 4, and the outer side surfaces of the outer circles are used to connect with the inner side walls of the through holes of the parts to be positioned.

[0021] In this embodiment, a shaft shoulder is provided at the upper end of the outer arc surface of the positioning sleeve 4. The outer diameter of the shaft shoulder is larger than the aperture of the through hole on the part to be positioned, and the shaft shoulder is used for positioning between the positioning sleeve 4 and the part.

[0022] In this embodiment, a plurality of through grooves penetrating the side walls are provided at equal intervals on the upper and lower end surfaces of the positioning sleeve 4.

[0023] Instructions for use: The bushing as a whole is composed of a first bushing 1, a second bushing 3, and a partition 2. There are shaft holes of the same size at the centers of the three parts. Now, the three parts are sleeved on the outer side of the positioning sleeve 4. At this time, there is a little gap between the inner side walls of the shaft holes of the three parts and the outer side wall of the outer circle on the positioning sleeve 4. Then, the upper conical die 5 and the lower conical die 6 are respectively pressed into the upper opening and the lower opening of the positioning sleeve 4 so that the positioning groove 9 and the positioning post 8 are engaged;

[0024] Screw the bolt 7 into the threaded holes passing through the upper conical die 5 and the lower conical die 6, and then tighten the bolt 7 with a wrench. During the tightening process of the bolt 7, the upper conical die 5 and the lower conical die 6 approach each other, that is, the upper conical die 5 and the lower conical die 6 are gradually pressed into the positioning sleeve 4. As the outer diameter of the outer side surfaces of the upper and lower conical dies 6 connected to the inner wall of the through hole of the positioning sleeve 4 expands, the positioning sleeve 4 will be expanded, so that the outer diameter of the positioning sleeve 4 gradually expands uniformly until the outer side surface of the positioning sleeve 4 is in contact with the inner side surface of the shaft hole, completely eliminating the gap therebetween. At this time, the shaft holes of the three parts are completely concentric;

[0025] After that, the three parts are fixedly connected by welding. Finally, loosen the bolt 7 with a wrench. The upper conical die 5 and the lower conical die 6 move away from each other, that is, both gradually withdraw from the inside of the positioning sleeve 4. The outer expansion pressure around the inside of the through hole of the positioning sleeve 4 is lost, the outer diameter of the positioning sleeve 4 shrinks, and there is a gap again between the positioning sleeve 4 and the inner wall of the shaft hole. Then, the upper and lower conical dies 6 are removed.

[0026] The above is only the preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A positioning tool for a spliced ​​sleeve, characterized in that: It includes a positioning sleeve and an expansion mold. The positioning sleeve is a cylindrical structure with a through hole at the center of its bottom surface. The expansion mold includes an upper conical mold and a lower conical mold. The upper conical mold and the lower conical mold are pressed into the upper opening and the lower opening of the positioning sleeve respectively to uniformly expand the outer diameter of the positioning sleeve.

2. A positioning tool for a spliced ​​sleeve according to claim 1, characterized in that: The upper conical mold and the lower conical mold are both truncated cone structures, and positioning grooves or positioning columns are respectively arranged on the bottom surfaces with smaller diameters.

3. A positioning tool for a spliced ​​sleeve according to claim 2, characterized in that: The centers of the bottom surfaces of the upper conical mold and the lower conical mold are provided with threaded holes, and the upper conical mold and the lower conical mold are connected with each other through bolts.

4. A positioning tool for a spliced ​​sleeve according to claim 1, characterized in that: The outer arc surface of the positioning sleeve is provided with a plurality of outer circles, and the outer side surfaces of the outer circles are used to be connected with the inner side walls of the through holes of the parts to be positioned.

5. A positioning tool for a spliced ​​sleeve according to claim 4, characterized in that: A shaft shoulder is provided at the upper end of the outer arc surface of the positioning sleeve, the outer diameter of the shaft shoulder is larger than the aperture of the through hole on the positioning part, and the shaft shoulder is used for positioning between the positioning sleeve and the part.

6. A positioning tool for a spliced ​​sleeve according to claim 1, characterized in that: The upper end surface and the lower end surface of the positioning sleeve are provided with a plurality of through grooves penetrating the side walls at even intervals.

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