Hobbing clamp
By adopting elastic tightening sleeve assembly and a double-sided clamping structure in the gear hobbing fixture, the problem of easy deformation of the gear blank in the prior art is solved, and more efficient gear hobbing is achieved.
Patent Information
- Application Number
- CN202422138335.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-30
- Publication Date
- 2025-06-10
- Estimated Expiration
- 2034-08-30
AI Technical Summary
In the prior art, two conical barrel parts are embedded in both ends of the gear blank to clamp and fix, which can easily cause excessive extrusion on the inner side of the end of the gear blank and deformation, resulting in subsequent secondary processing.
The elastic tightening sleeve assembly, press head, base assembly, positioning mandrel and tensioning assembly are adopted to clamp the gear blank outside through the elastic tightening sleeve assembly, and the gear blank double-sided clamping is used to ensure the stable limit of the gear blank.
Through uniform stress, the gear blank is avoided during clamping, the demand for subsequent secondary processing is reduced, and the efficiency of gear hobbing is improved.
Smart Images
Figure CN222957658U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a schematic diagram of a fixture structure, in particular to a hobbing fixture. Background Art
[0002] When a gear blank is subjected to hobbing and other machining operations, a hobbing fixture is required to clamp and fix it to ensure the efficient progress of the hobbing machining of the gear blank.
[0003] For example, a double-cone surface positioning hobbing fixture disclosed in CN216462273U includes a mounting disc, a fixing column, a first cylindrical section, a first cone section, a mandrel, and a threaded section that are fixedly connected in sequence from bottom to top. A first conical cylinder that mates with it is coated on the conical surface of the first cone section. A second cylindrical section and a second cone section are sleeved on the mandrel. The second cone section is concentrically fixed at the lower end of the second cylindrical section. A second conical cylinder that mates with it is coated on the conical surface of the second cone section. A nut is screwed on the threaded section. A pressing cylinder is provided between the nut and the second cylindrical section. Both the mandrel and the threaded section are located inside the pressing cylinder.
[0004] The above double-cone surface positioning hobbing fixture uses the conical ends of the first conical cylinder and the second conical cylinder to penetrate into the two ends of the gear blank one by one for clamping and positioning. During the clamping process, the stress generated at the contact parts between the conical ends of the first conical cylinder and the second conical cylinder and the gear blank is relatively concentrated, and it is easy to cause excessive extrusion and deformation on the inner side of the end of the gear blank, resulting in the need for secondary machining of the inner side of the end of the gear blank subsequently. Content of the Utility Model
[0005] Aiming at the deficiencies in the prior art, the purpose of the present utility model is to provide a hobbing fixture to solve the problem in the prior art that when clamping and fixing by partially embedding two conical cylinders in the shape of a cone into the two ends of the gear blank, it is easy to cause excessive extrusion and deformation on the inner side of the end of the gear blank.
[0006] To achieve the above purpose, the present utility model adopts the following technical solution: A hobbing fixture for clamping and fixing a gear blank, comprising:
[0007] An elastic expansion sleeve assembly for sleeving the gear blank on its outer side;
[0008] A pressing head having a first abutting plane and used to make the first abutting plane abut against one end face of the gear blank under the action of a center punch on a machine tool;
[0009] A base assembly fixedly connected to the machine tool, and an installation through hole is formed in the base assembly along its axial direction;
[0010] A positioning mandrel, one end of the positioning mandrel abuts against the base assembly and has a limiting portion, and a second abutting plane that abuts against the other end face of the gear blank is provided on the limiting portion. An elastic expansion sleeve assembly is movably sleeved on the positioning mandrel and is located on one side of the limiting portion. An assembly through hole is axially formed in the positioning mandrel along its axial direction;
[0011] A tensioning assembly, a part of the tensioning assembly freely passes through the mounting through hole and the assembly through hole to form a limiting head. When the tensioning assembly contracts, the limiting head cooperates with the limiting portion to squeeze the elastic expansion sleeve assembly to deform so that the elastic expansion sleeve assembly tightens the gear blank.
[0012] Technical principle:
[0013] The gear blank is sleeved on the elastic expansion sleeve assembly. The tensioning assembly contracts to drive the limiting head to move towards the limiting portion. The distance between the limiting head and the limiting portion decreases, so as to squeeze the elastic expansion sleeve assembly. The elastic expansion sleeve assembly deforms and expands towards its outer side, thereby tightening and fixing the gear blank; at the same time, under the action of the center drill on the machine tool, the first abutting plane on the pressure head abuts against one end of the gear blank, and the second abutting plane formed on the limiting portion abuts against the other end of the gear blank. The gear blank is clamped by the cooperation of the limiting portion and the pressure head.
[0014] Compared with the prior art, the utility model has the following beneficial effects:
[0015] When the gear hobbing fixture clamps and fixes the gear blank, the first abutting plane on the pressure head abuts against one end of the gear blank and the second abutting plane formed on the limiting portion abuts against the other end of the gear blank to realize the clamping of the gear blank; at the same time, the elastic expansion sleeve assembly tightens and fixes the gear blank to stably limit and fix the gear blank, ensuring that the gear blank can be efficiently hobbed, etc. And during the process of limiting and fixing the gear blank by this cooperation, the force on the gear blank is relatively uniform, and the gear blank will not be deformed. Description of the drawings
[0016] Figure 1 is an assembly schematic diagram of an embodiment of the utility model;
[0017] Figure 2 is Figure 1 a cross-sectional view along line A-A;
[0018] Figure 3 is Figure 2 the structural schematic diagram of the positioning mandrel in
[0019] Figure 4 is Figure 2 the structural schematic diagram of the expansion sleeve in
[0020] The reference numerals in the attached drawings of the specification include: elastic tension sleeve assembly 1, tension sleeve 11, tension sleeve body 111, relief notch 112, spacer cone sleeve 12, pressure head 2, base assembly 3, base 31, connection plate 32, positioning mandrel 4, limiting portion 41, tensioning assembly 5, limiting head 51, expander 52, tensioning rod 53, compression cone sleeve 6, backing plate 7, and gear blank 8. Detailed implementation mode
[0021] The present utility model will be further described in detail below through specific implementation modes:
[0022] In order to stably and accurately clamp and fix the gear blank, a first conical cylinder and a second conical cylinder are used to clamp and fix the gear blank, generating concentrated stress inside the inner sides of both ends of the gear blank, which is likely to cause excessive extrusion and deformation inside the inner sides of the ends of the gear blank, resulting in the need for secondary processing of the inner sides of the ends of the gear blank subsequently. To solve this problem, as Figure 1 , Figure 2 and Figure 3 shown, an embodiment of the present utility model provides a hobbing fixture for clamping and fixing a gear blank, including an elastic tension sleeve assembly 1, a pressure head 2, a base assembly 3 with a base 31, a positioning mandrel 4, and a tensioning assembly 5; wherein, the elastic tension sleeve assembly 1 is used to sleeved the gear blank 8 on its outer side; the pressure head 2 has a first abutting plane and is used to make the first abutting plane abut against one end face of the gear blank 8 under the action of the center drill on the machine tool; the base assembly 3 is fixedly connected to the machine tool, and an installation through hole is formed along the axial direction inside the base assembly 3; one end of the positioning mandrel 4 abuts against the base assembly 3 and has a limiting portion 41, and a second abutting plane for abutting against the other end face of the gear blank 8 is provided on the limiting portion 41. The elastic tension sleeve assembly 1 is movably sleeved on the positioning mandrel 4 and is located on one side of the limiting portion 41, and an assembly through hole is opened along the axial direction inside the positioning mandrel 4; a part of the tensioning assembly 5 freely passes through the installation through hole and the assembly through hole to form a limiting head 51, and when the tensioning assembly 5 contracts, the limiting head 51 cooperates with the limiting portion 41 to extrude the elastic tension sleeve assembly 1 to deform so that the elastic tension sleeve assembly 1 tightens the gear blank 8.
[0023] The specific operation of this hobbing fixture when clamping the gear blank 8 is as follows:
[0024] The gear blank 8 is sleeved on the elastic expansion sleeve assembly 1. The tensioning assembly 5 contracts to drive the limit head 51 to move towards the limit portion 41. The distance between the limit head 51 and the limit portion 41 decreases, so as to squeeze the elastic expansion sleeve assembly 1. The elastic expansion sleeve assembly 1 deforms and expands towards its outside, thereby tightening and fixing the gear blank 8. At the same time, under the action of the center drill on the machine tool, the first abutting plane on the pressure head 2 abuts against one end of the gear blank 8, and the second abutting plane formed on the limit portion 41 abuts against the other end of the gear blank 8. The gear blank 8 is clamped by the cooperation of the limit portion 41 and the pressure head 2.
[0025] When this hobbing fixture clamps and fixes the gear blank 8, the first abutting plane on the pressure head 2 abuts against one end of the gear blank 8 and the second abutting plane formed on the limit portion 41 abuts against the other end of the gear blank 8, so as to clamp the gear blank 8. At the same time, the elastic expansion sleeve assembly 1 tightens and fixes the gear blank 8, so as to stably limit and fix the gear blank 8, ensuring that the gear blank 8 can efficiently carry out hobbing processing, etc. And during the process of limiting and fixing the gear blank 8 by this cooperation, the force on the gear blank 8 is relatively uniform, and the gear blank 8 will not be deformed.
[0026] To better understand this solution, the following further optimizes the structures such as the tensioning assembly 5.
[0027] As Figure 1 and Figure 2 shown, according to another embodiment of the present invention, in the hobbing fixture, the tensioning assembly 5 includes a telescopic device 52 and a tensioning rod 53. The tensioning rod 53 is placed in the installation through hole and the assembly through hole, and one end of it is connected to the telescopic device 52, and the other end is connected to the limit head 51.
[0028] In this embodiment: the telescopic device 52 can be an oil cylinder. The oil cylinder is fixedly connected to the machine tool, and the screw rod of the oil cylinder is threadedly connected to one end of the tensioning rod 53. When the telescopic device 52 contracts, it drives the limit head 51 to move. The limit head 51 cooperates with the limit portion 41 to squeeze the elastic expansion sleeve assembly 1, and the elastic expansion sleeve assembly 1 elastically deforms and expands inside the gear blank 8.
[0029] Among them, the limit head 51 and the tensioning rod 53 can be connected by a threaded connection method.
[0030] Based on the above solution:
[0031] A pressing cone sleeve 6 is movably sleeved on the tensioning rod 53. The pressing cone sleeve 6 is located between the limit head 51 and the elastic expansion sleeve assembly 1 and has an embedded end with one end being conical. The embedded end is used for the limit head 51 to squeeze the pressing cone sleeve 6 so that it is embedded into one end of the elastic expansion sleeve assembly 1.
[0032] After the elastic tensioning sleeve assembly 1 is installed on the positioning core shaft 4, a certain assembly gap is formed between the positioning core shaft 4 and the elastic tensioning sleeve assembly 1; when the telescope 52 contracts, it drives the limit head 51 to move, and the limit head 51 drives the clamping cone sleeve 6 to move toward the limit portion 41, and the embedded end of the clamping cone sleeve 6 is embedded in the assembly gap to resist against one end of the elastic tensioning sleeve assembly 1. The clamping cone sleeve 6 cooperates with the limit portion 41 to more quickly cause the elastic tensioning sleeve assembly 1 to undergo elastic deformation to tighten against the inner side of the gear blank 8.
[0033] like Figure 2 and Figure 4 As shown, according to another embodiment of the utility model, a gear rolling fixture, wherein the elastic tension sleeve assembly 1 includes at least one tension sleeve 11 sleeved on the positioning core shaft 4, when the number of tension sleeves 11 is greater than one, they are distributed sequentially along the axial direction of the positioning core shaft 4 and a separating cone sleeve 12 sleeved outside the positioning core shaft 4 is provided between two adjacent tension sleeves 11 to separate them.
[0034] In this embodiment: there are two tension sleeves 11 and there are four corresponding gear blanks 8, and the four are mounted on the outside of the two tension sleeves 11; the separating cone sleeve 12 is used to separate the two adjacent tension sleeves 11, specifically, the middle part of the separating cone sleeve 12 protrudes toward the outside and both ends are conical, and the two ends of the separating cone sleeve 12 are inserted into one end of the two tension sleeves 11 and abut against each other; when the telescopic device 52 contracts, the pressing cone sleeve 6 cooperates with the limiting part 41 to extrude the tension sleeve 11, and the structural design of the separating cone sleeve 12 is also conducive to the rapid response of the tension sleeve 11 to deform and tighten on the inner side of the gear blank 8.
[0035] Based on the above scheme:
[0036] Each of the tensioning sleeves 11 comprises a tensioning sleeve 11 body and a clearance notch 112, wherein the tensioning sleeve 11 body is sleeved on the positioning core shaft 4; there are multiple clearance notches 112 and they are circumferentially arranged on the tensioning sleeve 11 body, and each clearance notch 112 is formed by extending from one end of the tensioning sleeve 11 body to the other end along its axial direction, and the initial ports of two adjacent clearance notches 112 during the extension process are located at different ends of the tensioning sleeve 11 body.
[0037] Here, the multiple clearance notches 112 are opened and distributed on the tension sleeve 11 body. When the tension sleeve 11 body is squeezed to expand outward, the multiple clearance notches 112 evenly form clearance spaces on the tension sleeve 11 body to prevent the tension sleeve 11 body from being damaged during the squeezing process.
[0038] Specifically, each of the relief notches 112 includes a strip-shaped notch section formed by extending from one end of the body of the tensioning sleeve 11 along its axial direction towards the other end, and a round hole section formed by connecting at one end of the strip-shaped notch section placed inside the body of the tensioning sleeve 11, so as to provide a larger relief space at both ends of the tensioning sleeve 11 and enable the tensioning sleeve 11 to have a larger elastic deformation amount.
[0039] As Figure 1 and Figure 2 shown, according to another embodiment of the present invention, for the hobbing fixture, a middle part of one end of the pressing head 2 provided with the first abutting plane has an activity space for the limiting head 51 to freely insert, and a tapered groove for the center drill on the machine tool to be inserted and abutted is formed at the other end thereof.
[0040] In this embodiment: a weight-reducing through hole is axially formed in the pressing head 2, and one end of the weight-reducing through hole forms an open end as the activity space to provide an activity space for the limiting head 51; the other end of the weight-reducing through hole is conical and its large end faces outward of the pressing head 2 to form a tapered groove, which is convenient for the center drill on the machine tool to be inserted into the tapered groove for abutting, ensuring that the pressing head 2 and one end of the gear blank 8 always remain abutted.
[0041] As Figure 1 and Figure 2 shown, according to another embodiment of the present invention, for the hobbing fixture, a backing plate 7 for abutting between the gear blank 8 and the limiting part 41 is sleeved on the positioning mandrel 4.
[0042] The number of the backing plates 7 can be reasonably used according to requirements. The backing plate 7 is in a circular ring shape and the limiting part 41 is an annular protrusion integrally formed on the outer side of one end of the positioning mandrel 4; then in this embodiment, the specific clamping of the gear blank 8 is the cooperation between the backing plate 7 and the pressing head 2.
[0043] As Figure 1 and Figure 2 shown, according to another embodiment of the present invention, for the hobbing fixture, the base 31 of the assembly 3 includes a base 31 and a connecting plate 32. The base 31 is in a cylindrical shape and one end thereof abuts against the limiting part 41, and an installation through hole is formed in the base 31; the connecting plate 32 is fixedly sleeved on the other end outside the base 31 and is used for being fixedly connected with the machine tool.
[0044] In this embodiment: a plurality of connecting holes are axially formed in the connecting plate 32, and each connecting hole is fitted with a bolt to fixedly connect the connecting plate 32 to the machine tool, ensuring that the base 31 is stably arranged to abut against the limiting part 41, limiting the positioning mandrel 4, and ensuring the smooth progress of the tensioning process of the elastic tensioning sleeve assembly 1 on the gear blank 8.
[0045] When this hobbing fixture is in use, specifically:
[0046] Fix both the expander 52 and the connecting plate 32 on the machine tool;
[0047] Then assemble the gear blank 8 onto the tension sleeve 11. One end of the gear blank 8 abuts against the backing plate 7. Then pass the end of the tension rod 53 away from the limiting part 41 through the tension sleeve 11. Then fit the pressing cone sleeve 6 onto the tension rod 53. Then connect the limiting head 51 to the tension rod 53;
[0048] Make one end of the pressing head 2 abut against the other end of the assembled gear blank 8 by inserting the center drill into the conical groove;
[0049] Start the expander 52. The expander 52 contracts, driving the limiting head 51 to drive the pressing cone sleeve 6 to move towards the direction close to the limiting part 41. The pressing cone sleeve 6 and the limiting part 41 cooperate to squeeze the tension sleeve 11, and the tension sleeve 11 undergoes elastic deformation to be tightened on the inner side of the gear blank 8. Among them, one end of the gear blank 8 always abuts against the backing plate 7. During the process of the tension sleeve 11 being squeezed and deformed, the center drill drives the pressing head 2 to move to ensure that the pressing head 2 abuts against the other end of the gear blank 8;
[0050] After the limiting and fixing of the gear blank 8 are completed, hobbing processing and the like can be carried out on the gear blank 8.
[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.
Claims
1. A gear hobbing fixture for clamping and fixing a gear blank, characterized in that: include: An elastic tension sleeve assembly, the elastic tension sleeve assembly is used to allow the gear blank to be sleeved on its outer side; A pressing head, the pressing head having a first abutting plane and used to make the first abutting plane abut against an end face of the gear blank under the action of an ejector pin on the machine tool; A base assembly, wherein the base assembly is fixedly connected to the machine tool, and a mounting through hole is formed in the base assembly along its axial direction; A positioning mandrel, one end of which is against the base assembly and has a limiting portion, the limiting portion has a second abutting plane against the other end surface of the gear blank, the elastic tension sleeve assembly is movably sleeved on the positioning mandrel and located on one side of the limiting portion, and an assembly through hole is opened in the positioning mandrel along its axial direction; The tensioning component, the tensioning component part freely passes through the installation through hole and the assembly through hole to form a limiting head, and the limiting head cooperates with the limiting part to squeeze the elastic tensioning sleeve component to deform when the tensioning component contracts, so that the elastic tensioning sleeve component tightens the gear blank.
2. A gear hobbing fixture according to claim 1, characterized in that: The tensioning assembly comprises: Retractor; A tension rod is placed in the installation through hole and the assembly through hole and one end of the tension rod is connected to the telescope, and the other end of the tension rod is connected to the limit head.
3. A gear hobbing fixture according to claim 2, characterized in that: The movable sleeve on the tension rod is provided with a compression cone sleeve, which is located between the limit head and the elastic tension sleeve assembly and has an embedded end portion with a cone at one end. The embedded end portion is used to squeeze the compression cone sleeve at the limit head to embed it into one end of the elastic tension sleeve assembly.
4. A gear hobbing fixture according to any one of claims 1 to 3, characterized in that: The elastic tension sleeve assembly includes at least one tension sleeve sleeved on the positioning core shaft. When the number of tension sleeves is greater than one, they are distributed in sequence along the axial direction of the positioning core shaft and a separating cone sleeve sleeve sleeved outside the positioning core shaft is provided between two adjacent tension sleeves to separate them.
5. A gear hobbing fixture according to claim 4, characterized in that: Each of the tension sleeves comprises: A tension sleeve body, wherein the tension sleeve body is sleeved on the positioning core shaft; There are multiple clearance gaps and they are circumferentially arranged on the tension sleeve body. Each clearance gap is formed by extending from one end of the tension sleeve body to the other end along its axial direction, and the initial ports of two adjacent clearance gaps during the extension process are located at different ends of the tension sleeve body.
6. A gear hobbing fixture according to any one of claims 1 to 3, characterized in that: The middle part of one end of the pressure head provided with the first abutting plane has a movable space for the limit head to be freely inserted, and the other end thereof is formed with a tapered groove for the ejector pin on the machine tool to be inserted into and abut against.
7. A gear hobbing fixture according to any one of claims 1 to 3, characterized in that: The positioning core shaft is sleeved with a pad used to abut between the gear blank and the limiting portion.
8. A gear hobbing fixture according to any one of claims 1 to 3, characterized in that: The base assembly comprises: A base, the base is cylindrical and one end of the base abuts against the limiting portion, and a mounting through hole is formed in the base; A connecting plate is fixedly sleeved on the other end outside the base and is used for being fixedly connected to the machine tool.