Hobbing tool with repeated positioning function

Abstract

The utility model relates to the technical field of spline processing, and particularly discloses a hobbing tool with a repeated positioning function, which is characterized by comprising a hobbing device for clamping a workpiece and a positioning tool mounted on the outer side of the hobbing tool and used for positioning the workpiece, the positioning tool comprises a guide rod and a positioning pin rod, wherein the guide rod is slidably mounted on the outer side of the hobbing tool and arranged along the Z axis, and the positioning pin rod is mounted on the guide rod and moves in the X-axis direction. By arranging the positioning tool, the reworked workpiece can be effectively positioned again, after positioning meets the machining requirement, the workpiece is clamped through the hobbing device, and reworking machining of the workpiece is achieved through the hobbing cutter.

Description

Technical Field

[0001] The utility model relates to the technical field of spline processing, and more particularly to a gear hobbing tool with a repeated positioning function. Background Art

[0002] In daily machining, the common types of gear external splines are straight teeth, spiral teeth, and inverted tapered teeth; common spline processing methods include hobbing, shaping, skiving, shaving, grinding, etc.; if everything is normal during the processing, all processed products can meet the size requirements of the drawing, but dimensional deviations will inevitably occur during work. For unprocessed products, just change the machine tool parameters.

[0003] For external gear splines, if the root circle and span of the spline teeth exceed the lower tolerance, the workpiece may have to be scrapped. However, if the root circle and span of the spline teeth exceed the upper tolerance and there is still machining allowance, then rework can be performed to bring the dimensions within the qualified range. However, in the entire machinery industry, it is currently very difficult to accurately and repeatedly position the spline teeth of gear workpieces during rework. If the positioning is not accurate, the dimensions of the reworked workpiece will be difficult to meet the drawing requirements.

[0004] During the debugging and production of external spline gears, it is inevitable that many workpieces with out-of-tolerance cross-rod dimensions will appear over time. In many cases, due to the lack of tooling for rework, most of the out-of-tolerance parts are directly scrapped, which will cause certain economic losses.

[0005] For workpieces with out-of-tolerance cross-rod spacing, which are spur gears, manual gear alignment can be tried. The worker holds a measuring rod against the external spline keyway of the workpiece, reworks the piece and repeats the gear alignment. However, this method is only applicable to spur gears. If you encounter helical gears or inverted bevel gears, this method cannot be used. However, this method is not only inefficient, but also has poor positioning accuracy. It also requires a high level of operator skill. Therefore, factories are often reluctant to use manual gear alignment to rework workpieces. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a gear hobbing tool with a repeated positioning function, which can effectively repeat the positioning of spur external gears, external spline inverted bevel gears, and spiral external spline gears to complete the rework of the workpiece;

[0007] The solution adopted by the utility model to solve the technical problem is:

[0008] A gear hobbing tool with a repeatable positioning function, comprising a gear hobbing device for clamping a workpiece, and a positioning tool installed outside the gear hobbing tool and used to position the workpiece;

[0009] The positioning tool comprises a guide rod which is slidably mounted on the outside of the gear hobbing tool and arranged along the Z axis, and a positioning pin rod which is mounted on the guide rod and moves along the X axis.

[0010] In some possible embodiments, the positioning tool also includes a base installed on the outside of the gear hobbing device and used to install the guide rod; a mounting hole is provided on the base, and the guide rod is inserted into the mounting hole and slides with the base along the axial direction of the mounting hole.

[0011] In some possible implementations, a locking member for locking the guide rod and the base is provided on the base.

[0012] In some possible embodiments, a fixing block for mounting a positioning pin is provided on the top of the guide rod; a through hole is provided on the fixing block; the positioning pin is inserted into the through hole and slides with the fixing block along the X-axis direction.

[0013] In some possible implementations, the base includes a bracket connected to the gear hobbing device via bolts, and a fixing seat mounted on the bracket and used for mounting the guide rod; the mounting hole is provided on the fixing seat.

[0014] In some possible implementations, a waist-shaped hole for use with a bolt is provided on the bracket, and the long axis of the waist-shaped hole is horizontally arranged.

[0015] In some possible implementations, the gear hobbing device includes a base, and an expansion sleeve clamping assembly mounted on the base and used to clamp and fix the workpiece; the base is mounted on an outer surface of the base.

[0016] In some possible embodiments, the expansion sleeve type clamping assembly includes a positioning seat mounted on the base, an expansion sleeve mounted on the positioning seat, a lower tray sleeved on the outside of the positioning seat and used to support the workpiece sleeved on the outside of the expansion sleeve, an upper tray disposed above the expansion sleeve and used in conjunction with the lower tray, an upper rod having one end connected to the upper tray and the other end passing through the expansion sleeve positioning seat, and a lower rod connected to the end of the upper rod away from the upper tray;

[0017] The upper pull rod, the lower pull rod, the positioning seat and the expansion sleeve are coaxially connected.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The utility model can effectively realize the re-positioning of the workpiece by setting the positioning tool. After the positioning meets the processing requirements, the workpiece is clamped by the gear hobbing device and the workpiece is reworked by the hob.

[0020] The utility model has a simple structure and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of the utility model;

[0022] Figure 2 It is a cross-sectional view of the utility model;

[0023] Figure 3 This is a schematic structural diagram of the base in the utility model;

[0024] Figure 4 This is a schematic structural diagram of the guide rod in the utility model;

[0025] Figure 5 This is a structural diagram of the workpiece positioning process using the present invention;

[0026] Among them: 1. Gear hobbing device; 11. Base; 12. Expanding sleeve clamping assembly; 2. Hob; 3. Positioning tool; 31. Guide rod; 32. Positioning pin rod; 33. Base; 331. Bracket; 3311. Waist-shaped hole; 332. Fixed seat; 3321. Mounting hole; 34. Fixed block; 35. Locking piece; 341. Through hole; 10. Workpiece; 101. Spline tooth groove. DETAILED DESCRIPTION

[0027] In this application, unless otherwise specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integration; they can refer to direct connections or indirect connections through an intermediary; they can refer to internal communication between two components or interactions between two components. The terms "first," "second," and similar terms mentioned in this application do not denote any order, quantity, or importance; they are simply used to distinguish between different components. Similarly, terms such as "a" or "an" do not indicate a quantitative limitation; rather, they indicate the presence of at least one. In the implementation of this application, "and / or" describes an association relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. In the description of the embodiments of this application, unless otherwise specified, "plurality" means two or more. For example, "plurality" refers to two or more positioning posts. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0028] The utility model is described in detail below.

[0029] like Figure 1-Figure 4 As shown:

[0030] A gear hobbing tool with a repeatable positioning function, comprising a gear hobbing device 1 for clamping a workpiece 10, and a positioning tool 3 installed outside the gear hobbing tool and used to position the workpiece 10;

[0031] The positioning tooling 3 includes a guide rod 31 slidably mounted on the outside of the gear hobbing tooling and arranged along the Z axis, a positioning pin rod 32 mounted on the guide rod 31 and moving along the X axis, and a base 33 mounted on the outside of the gear hobbing device 1 and used to mount the guide rod 31; the base and the guide rod 31 slide in cooperation along the Z axis; the positioning pin rod 32 and the guide rod 31 are perpendicular to each other.

[0032] When in use, the workpiece 10 is first placed on the outside of the gear hobbing device 1 and processed. After the processing is completed, the workpiece 10 is not removed first, and the guide rod 31 is controlled to move along the Z-axis direction so that the positioning pin rod 32 is aligned with the spline tooth groove 101 of the workpiece 10. The position of the base 33 on the positioning fixture 3 for fixing the guide rod 31 is adjusted and the base 33 is fixed, so that the positioning fixture 3 can position the workpiece 10 for subsequent rework;

[0033] Clamp the workpiece 10 to be reworked on the gear hobbing device 1, slide the guide rod 31 upward along the Z-axis direction, control the axis of the positioning pin rod 32 to be in the middle of the tooth width of the spline tooth groove 101, and then fix the guide rod 31;

[0034] Move the positioning pin 32 along the X-axis direction so that one end of the positioning pin 32 close to the gear hobbing device 1 is close to the workpiece 10, and the spline tooth groove 101 of the workpiece 10 contacts the end of the gear hobbing positioning pin 32, thus completing the positioning of the reworked workpiece 10, and the workpiece 10 is clamped by the gear hobbing device 1;

[0035] Move the positioning pin rod 32 to the side away from the gear hobbing device 1 and control the guide rod 31 to slide downward to avoid interference between the positioning tool 3 and the hob 2 during gear hobbing, and then perform rework;

[0036] According to the size of the out-of-tolerance, the corresponding tool compensation is made and the hob 2 is used for rework. After the rework is completed, the size of the reworked workpiece 10 is measured to evaluate whether the workpiece 10 is qualified. If there is no problem, batch rework can be carried out; if there is a problem, the positioning tool 3 is adjusted again until the workpiece 10 is reworked and qualified and meets the process requirements.

[0037] In some possible embodiments, in order to effectively achieve the sliding fit between the positioning tool 3 and the gear hobbing device 1, a mounting hole 3321 is provided on the base 33, and the guide rod 31 is inserted into the mounting hole 3321 and slides with the base 33 along the axial direction of the mounting hole 3321; a locking member 35 is provided on the base 33 for locking the guide rod 31 and the base 33.

[0038] The mounting hole 3321 is a through hole for fitting the guide rod 31. The guide rod 31 can slide in the mounting hole 3321 along the Z-axis direction, thereby adjusting the position of the positioning pin 32 installed on the top of the guide rod 31. After the position is adjusted to the desired position, the guide rod 31 and the base 33 are locked and fixed by the locking member 35.

[0039] Specifically, the locking member 35 is a screw; a threaded hole is provided on the base 33 for use with the screw and communicating with the mounting hole 3321; the axis of the threaded hole is provided along the X-axis direction;

[0040] Furthermore, the locking members 35 are provided in at least two groups.

[0041] The base 33 includes a bracket 331 connected to the gear hobbing device 1 via bolts, and a fixing seat 332 mounted on the bracket 331 and used to mount the guide rod 31. The mounting hole 3321 is provided on the fixing seat 332. The brackets 331 are provided in two groups and are symmetrically arranged along the Z-axis, with the fixing seat 332 disposed between the two groups of brackets 331.

[0042] The bracket 331 is provided with a waist-shaped hole 3311 for use with a bolt, and the long axis of the waist-shaped hole 3311 is arranged horizontally;

[0043] Specifically, a threaded hole for use with a bolt is provided on the outer side of the gear hobbing device 1, and the bolt will pass through the waist-shaped hole 3311 and cooperate with the threaded hole;

[0044] The base 33 is mounted on the outside of the gear hobbing device 1 via a bracket 331. The waist-shaped hole 3311 allows the relative position of the base 33 and the gear hobbing device 1 to be adjusted, so that the axis of the positioning pin 32 can be located in the middle of the spline tooth groove 101.

[0045] In some possible embodiments, a fixing block 34 for mounting a positioning pin 32 is provided on the top of the guide rod 31; a through hole 341 is provided on the fixing block 34; the positioning pin 32 is inserted into the through hole 341 and slides with the fixing block 34 along the X-axis direction.

[0046] The fixing block 34 is integrally formed with the guide rod 31 , the axis of the through hole 341 is arranged along the X-axis direction, and the positioning pin rod 32 is sleeved in the through hole 341 . During positioning, the end of the positioning pin rod 32 close to the gear hobbing device 1 moves toward the side close to the workpiece 10 .

[0047] In some possible embodiments, in order to effectively achieve the clamping and fixing of the workpiece 10 by the gear hobbing device 1 and cooperate with the hob 2 to achieve the processing of the workpiece 10; the gear hobbing device 1 is a prior art, which includes a base 11 for mounting a base 33, and an expansion sleeve clamping assembly mounted on the base 11 and used to clamp and fix the workpiece 10; the base 33 is mounted on the outer surface of the base 11; specifically, the base 33 is mounted on the side of the base 11;

[0048] Specifically, the expansion sleeve type clamping assembly 12 includes a positioning seat installed on the base 11, an expansion sleeve installed on the positioning seat and used to tighten the workpiece 10, a lower tray mounted on the outside of the positioning seat and used to support the workpiece 10 mounted on the outside of the expansion sleeve, an upper tray arranged above the expansion sleeve and used in conjunction with the lower tray, an upper pull rod connected to the upper tray at one end and passing through the expansion sleeve positioning seat at the other end, and a lower pull rod connected to the end of the upper pull rod away from the upper tray; the upper pull rod, the lower pull rod, the positioning seat, and the expansion sleeve are coaxially connected.

[0049] The present invention is not limited to the aforementioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A gear hobbing tool with a repeated positioning function, characterized in that: It includes a gear hobbing device for clamping the workpiece, and a positioning tool installed outside the gear hobbing tool and used to position the workpiece; The positioning tool comprises a guide rod which is slidably mounted on the outside of the gear hobbing tool and arranged along the Z axis, and a positioning pin rod which is mounted on the guide rod and moves along the X axis.

2. The gear hobbing tool with repeated positioning function according to claim 1, characterized in that: The positioning tool also includes a base installed outside the gear hobbing device and used to install the guide rod; a mounting hole is provided on the base, and the guide rod is sleeved in the mounting hole and slides with the base along the axial direction of the mounting hole.

3. The gear hobbing tool with repeated positioning function according to claim 2, characterized in that: A locking piece for locking the guide rod and the base is provided on the base.

4. The gear hobbing tool with repeated positioning function according to claim 2, characterized in that: A fixing block for mounting a positioning pin is provided on the top of the guide rod; a through hole is provided on the fixing block; the positioning pin is sleeved in the through hole and slides with the fixing block along the X-axis direction.

5. The gear hobbing tool with repeated positioning function according to claim 2, characterized in that: The base includes a bracket connected to the gear hobbing device through bolts, and a fixing seat installed on the bracket and used for installing the guide rod; the mounting hole is arranged on the fixing seat.

6. The gear hobbing tool with repeated positioning function according to claim 5, characterized in that: A waist-shaped hole used in conjunction with a bolt is provided on the bracket, and the long axis of the waist-shaped hole is horizontally arranged.

7. The gear hobbing tool with a repeatable positioning function according to any one of claims 2 to 6, characterized in that: The gear hobbing device includes a base, and an expansion sleeve clamping assembly installed on the base and used for clamping and fixing the workpiece; the base is installed on the outer side of the base.

8. The gear hobbing tool with repeated positioning function according to claim 7, characterized in that: The expansion sleeve type clamping assembly includes a positioning seat mounted on the base, an expansion sleeve mounted on the positioning seat, a lower tray sleeved on the outside of the positioning seat and used to support the workpiece sleeved on the outside of the expansion sleeve, an upper tray arranged above the expansion sleeve and used in conjunction with the lower tray, an upper pull rod with one end connected to the upper tray and the other end passing through the expansion sleeve positioning seat, and a lower pull rod connected to the end of the upper pull rod away from the upper tray; The upper pull rod, the lower pull rod, the positioning seat and the expansion sleeve are coaxially connected.

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