A detachable and replaceable chain wheel hobbing mandrel

Abstract

A detachable and replaceable sprocket hobbing mandrel relates to the sprocket machining technical field, including mandrel base and coaxial and detachable connection on the one end of mandrel base replacement shaft section, one end of mandrel base is equipped with first connecting part, one end of replacement shaft section is equipped with second connecting part, first connecting part and second connecting part are used in coordination, one end of mandrel base away from replacement shaft section is equipped with third connecting part to be connected with hobbing machine rotary table, the mandrel base of the new type can be fixed on the rotary table of hobbing machine, only by replacing the replacement shaft section with different shaft diameters, different models and sizes of sprocket can be machined, the time for replacing the hobbing mandrel is saved, and the work efficiency is improved, when the replacement shaft section is worn or damaged, it can be replaced alone, and the waste of resources is avoided.

Description

Technical Field

[0001] This invention relates to the field of sprocket processing technology, specifically to a detachable and replaceable sprocket hobbing mandrel. Background Technology

[0002] In the gear hobbing process of sprockets, the hobbing mandrel plays a crucial role in positioning and supporting the sprocket. Traditional hobbing mandrels are mostly one-piece structures. When machining sprockets of different specifications, the entire mandrel often needs to be replaced, which is not only cumbersome and time-consuming but also increases equipment operating costs and reduces production efficiency. Moreover, if a one-piece mandrel experiences wear or damage after long-term use, the entire mandrel must be replaced, resulting in a waste of resources. Utility Model Content

[0003] This invention discloses a detachable and replaceable sprocket hobbing mandrel, which aims to solve the problem in the prior art that "the hobbing mandrel is an integral structure, and the replacement of the mandrel is cumbersome, inefficient, and can only be replaced as a whole after damage".

[0004] To achieve the above objectives, the technical solution of this invention is as follows: A detachable and replaceable sprocket hobbing mandrel includes a mandrel base and a replacement shaft section coaxially and detachably connected to one end of the mandrel base. One end of the mandrel base is provided with a first connecting part, and one end of the replacement shaft section is provided with a second connecting part. The first connecting part and the second connecting part are used in cooperation. The end of the mandrel base away from the replacement shaft section is provided with a third connecting part for connecting to the rotary table of a hobbing machine.

[0005] Preferably, the mandrel base is a disc structure, and the outer edge of the disc structure is provided with a plurality of keyways around the axis. The keyways are connected to the rotary table by limiting keys constrained within the keyways. The third connecting part is a fixed shaft coaxial with the disc structure, and the fixed shaft is fixedly connected to a pre-set shaft hole of the rotary table.

[0006] Preferably, the mandrel base has a stepped shaft structure at the end away from the fixed shaft. The stepped shaft structure includes a large-diameter section located on the inner side and integrally connected with the disc structure, and a small-diameter section coaxially connected to the end of the large-diameter section. The top of the small-diameter section has a first connecting part.

[0007] Preferably, the first connecting part includes a circular groove coaxially embedded at the end of the small diameter section, and a positioning hole coaxially disposed at the bottom end of the circular groove and extending inward.

[0008] Preferably, the second connecting part includes a positioning pin that mates with the positioning hole, and a positioning block integrally connected to the end of the positioning pin away from the mandrel base and fixedly connected to the circular groove. The positioning block and the circular groove are connected by a thread or by a positioning bolt.

[0009] Preferably, the replacement shaft segment further includes a stepped shaft coaxially and integrally connected to the end of the positioning block away from the mandrel base. The stepped shaft is used to insert into the shaft hole of the sprocket to be processed. One end of the stepped shaft is provided with a planar structure for limiting the rotation of the sprocket relative to the stepped shaft. The end of the stepped shaft away from the mandrel base is coaxially provided with a gripping part.

[0010] Preferably, the gripping part is a rod structure coaxial with the step axis.

[0011] The advantages of this novel detachable and replaceable sprocket hobbing mandrel are as follows: This new type of mandrel base can be fixed on the rotary table of the gear hobbing machine. Different models and sizes of sprockets can be processed simply by replacing the replacement shaft sections with different shaft diameters, saving the time of replacing the gear hobbing mandrel and improving work efficiency. When the replacement shaft section is worn or damaged, it can be replaced individually, avoiding waste of resources. Attached Figure Description

[0012] To more clearly illustrate the technical solution of this invention, the accompanying drawings used in the embodiments are briefly described below, which constitute a part of the specification and are used together with the embodiments of this invention to explain this invention, but do not constitute a limitation on this invention.

[0013] Figure 1 A schematic diagram of the overall exploded structure of this novel invention; Figure 2 A front view structural diagram of the new mandrel base; Figure 3 A front view schematic diagram of the replacement shaft segment of this novel structure; Figure 4 A schematic diagram of the assembly structure when this new invention is in use.

[0014] 01. Mandrel base; 02. Replacement shaft section; 03. Rotary table; 04. Limit key; 05. Shaft hole; 06. Sprocket; 07. Planar structure; 1. First connecting part; 2. Second connecting part; 3. Circular groove; 4. Positioning block; 5. Positioning pin; 6. Stepped shaft; 7. Positioning hole; 8. Mounting part; 9. Fixed shaft; 10. Keyway. Detailed Implementation

[0015] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0016] The following embodiments can be understood as explaining a partial structure of the present invention individually, or as explaining a larger structure of the present invention through a combination of multiple embodiments.

[0017] This invention relates to a detachable and replaceable sprocket hobbing mandrel, such as... Figure 1-4 As shown, it includes a mandrel base 01 and a replacement shaft section 02 coaxially and detachably connected to one end of the mandrel base 01. One end of the mandrel base 01 is provided with a first connecting part 1, and one end of the replacement shaft section 02 is provided with a second connecting part 2. The first connecting part 1 and the second connecting part 2 are used in cooperation. The end of the mandrel base 01 away from the replacement shaft section 02 is provided with a third connecting part for connecting with the gear hobbing machine rotary table 03.

[0018] In this embodiment, as Figure 1-4 As shown, the spindle base 01 is a disc structure. The outer edge of the disc structure is provided with several keyways 10 around the axis. The keyways 10 are connected to the gear hobbing machine rotary table 03 by limiting keys 04 constrained in the keyways, ensuring that they are relatively fixed and rotate synchronously with the rotary table. The third connecting part is a fixed shaft 9 coaxial with the disc structure. The fixed shaft 9 is fixedly connected to the shaft hole 05 preset in the rotary table 03. The fixed connection method can be a flat key connection or an interference fit.

[0019] In this embodiment, as Figure 1-4 As shown, the mandrel base 01 has a stepped shaft structure (not marked in the figure) at one end away from the fixed shaft 9. The stepped shaft structure includes a large-diameter section located on the inner side and integrally connected with the disk structure, and a small-diameter section coaxially connected to the end of the large-diameter section. The top of the small-diameter section is provided with a first connecting part 1.

[0020] In this embodiment, as Figure 1 As shown, the first connecting part 1 includes a circular groove 3 coaxially embedded at the end of the small diameter section, and a positioning hole 7 coaxially disposed at the bottom end of the circular groove 3 and extending inward.

[0021] In this embodiment, as Figure 1 As shown, the second connecting part 2 includes a positioning pin 5 that works with the positioning hole 7, and a positioning block 4 integrally connected to the end of the positioning pin 5 away from the spindle base 01 and fixedly connected to the circular groove 3. The positioning block 4 and the circular groove 3 are connected by a thread (i.e., the positioning block is cylindrical and has an external thread, and the circular groove has an internal thread) or fixedly connected by a positioning bolt (i.e., the small diameter section has a threaded hole that passes through the circular groove, and the positioning bolt is screwed into the threaded hole to fix the positioning block).

[0022] In this embodiment, as Figure 1 , 3As shown in Figure 4, the replacement shaft segment 02 also includes a stepped shaft 6 coaxially and integrally connected to the end of the positioning block 4 away from the spindle base 01. The stepped shaft 6 is used to insert into the shaft hole of the sprocket 06 to be processed. One end of the stepped shaft 6 is provided with a planar structure 07 for limiting the rotation of the sprocket 06 relative to the stepped shaft 6. The end of the stepped shaft 6 away from the spindle base 01 is coaxially provided with a gripping part (not marked in the figure), such as... Figure 1 As shown, the gripping part is a rod structure coaxial with the step axis 6.

[0023] like Figure 4 As shown, in use, the fixed shaft is inserted into the shaft hole of the rotary table and fixed. Simultaneously, the keyways are positioned using limit keys to ensure precise positioning and synchronous rotation of the mandrel base and the rotary table. A replacement shaft segment is selected according to the model of the sprocket to be processed. The sprocket's shaft hole is aligned with the circular groove, and the replacement shaft segment is inserted, constraining the sprocket between the small-diameter section and the stepped shaft. The planar structure restricts relative rotation between the sprocket and the stepped shaft. During this process, the positioning block and the circular groove are kept fixed by rotation or the use of positioning bolts. After the sprocket is positioned, the gear hobbing machine can be started. As the rotary table drives the sprocket to rotate, the tooth groove contour of the sprocket is machined.

Claims

1. A detachable and replaceable sprocket hobbing mandrel, characterized in that: It includes a mandrel base and a replacement shaft section coaxially and detachably connected to one end of the mandrel base. One end of the mandrel base is provided with a first connecting part, and one end of the replacement shaft section is provided with a second connecting part. The first connecting part and the second connecting part are used in conjunction. The end of the mandrel base away from the replacement shaft section is provided with a third connecting part for connecting to the rotary table of the gear hobbing machine.

2. The detachable and replaceable sprocket hobbing mandrel as described in claim 1, characterized in that: The mandrel base is a disc structure. The outer edge of the disc structure is provided with several keyways around the axis. The keyways are connected to the rotary table by limiting keys constrained in the keyways. The third connecting part is a fixed shaft coaxial with the disc structure. The fixed shaft is fixedly connected to the shaft hole preset on the rotary table.

3. A detachable and replaceable sprocket hobbing mandrel as described in claim 2, characterized in that: The mandrel base has a stepped shaft structure at the end away from the fixed shaft. The stepped shaft structure includes a large-diameter section located on the inner side and integrally connected with the disk structure, and a small-diameter section coaxially connected to the end of the large-diameter section. The top of the small-diameter section has a first connecting part.

4. A detachable and replaceable sprocket hobbing mandrel as described in claim 3, characterized in that: The first connecting part includes a circular groove coaxially embedded at the end of the small diameter section, and a positioning hole coaxially disposed at the bottom end of the circular groove and extending inward.

5. A detachable and replaceable sprocket hobbing mandrel as described in claim 4, characterized in that: The second connecting part includes a positioning pin that mates with the positioning hole, and a positioning block integrally connected to the end of the positioning pin away from the mandrel base and fixedly connected to the circular groove. The positioning block and the circular groove are connected by a thread or fixedly connected by a positioning bolt.

6. A detachable and replaceable sprocket hobbing mandrel as described in claim 5, characterized in that: The replacement shaft section also includes a stepped shaft coaxially and integrally connected to the end of the positioning block away from the mandrel base. The stepped shaft is used to insert into the shaft hole of the sprocket to be processed. One end of the stepped shaft is provided with a planar structure for limiting the rotation of the sprocket relative to the stepped shaft. The end of the stepped shaft away from the mandrel base is coaxially provided with a gripping part.

7. A detachable and replaceable sprocket hobbing mandrel as described in claim 6, characterized in that: The gripping part is a rod structure coaxial with the step axis.

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