A machining fixture and clamping device for ball screw nuts

Abstract

This utility model relates to the field of machining tooling technology, specifically disclosing a machining tooling for ball screw nuts. It includes a coaxial positioning sleeve and a locking sleeve that can be threadedly connected. Both the positioning sleeve and the locking sleeve have mating holes. The mating holes on the positioning sleeve and the locking sleeve are respectively used for clearance fit with two shaft segments of different diameters of the ball screw nut blank. A protrusion is provided on the end face of the positioning sleeve facing the locking sleeve. The protrusion is used to insert into a keyway on the flange of the ball screw nut blank, with the protrusion and keyway engaging in a convex-concave fit. The flange of the ball screw nut blank with the keyway is clamped between the positioning sleeve and the locking sleeve. A clamping device includes a chuck and the aforementioned machining tooling for ball screw nuts, the chuck being used to clamp the positioning sleeve. This solution addresses the problem that currently used tooling that only provides axial and radial positioning of the workpiece cannot meet the machining requirements of ball screw nuts with diagonal positioning.

Description

Technical Field

[0001] This utility model relates to the field of machining tooling technology, specifically to a machining tooling and clamping device for ball screw nuts. Background Technology

[0002] In existing machining processes, when threading a workpiece, if there are no angular requirements during machining, it is only necessary to position the workpiece axially and radially. For example, the workpiece can be placed in a general-purpose tooling, which usually has an elastic chuck structure. The workpiece is fixed axially and radially by clamping the outer circle of the workpiece with the elastic chuck. This type of general-purpose tooling structure is simple, but it can only guarantee the axial and radial positional accuracy of the workpiece during machining, and cannot control the rotation angle of the workpiece around the axis (angular positioning).

[0003] However, for machining workpieces with angular requirements, such as those requiring additional... Figures 8 to 10 The ball screw nut shown has two shaft segments of different diameters, separated by an integrally formed flange. The flange has keyways, and the thread start point of the ball screw nut's central hole, the mounting holes on the outer circumference of the shaft segments, and the pin holes on the end faces of the shaft segments all have relative angular requirements. For machining ball screw nuts with angular requirements, the common clamping fixtures or the method of directly clamping the workpiece to a chuck can easily result in a machined product that does not meet design requirements. Utility Model Content

[0004] The present invention aims to provide a machining fixture and clamping device for ball screw nuts, so as to solve the problem that the currently used fixtures that only position the workpiece axially and radially cannot meet the machining requirements of ball screw nuts with diagonal positioning.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A machining fixture for ball screw nuts includes a coaxial positioning sleeve and a locking sleeve that can be threadedly connected. Both the positioning sleeve and the locking sleeve have mating holes. The mating holes on the positioning sleeve and the locking sleeve are respectively used for clearance fit with two shaft segments of different diameters of the ball screw nut blank. The end face of the positioning sleeve facing the locking sleeve has a protrusion. The protrusion is used to insert into the keyway on the flange of the ball screw nut blank. The protrusion and the keyway have a concave-convex fit. The flange of the ball screw nut blank with the keyway is clamped between the positioning sleeve and the locking sleeve.

[0006] This utility model also provides a clamping device, including a chuck and the aforementioned ball screw nut machining fixture, wherein the chuck is used to clamp the positioning sleeve.

[0007] The principle and advantages of this solution are as follows: The tooling in this solution is used to clamp the ball screw nut blank (i.e., the workpiece to be machined, hereinafter referred to as the workpiece) that has already been machined with a keyway. In use, the positioning sleeve is fixedly clamped on the chuck of the machine tool, and then the ball screw nut blank (i.e., the workpiece) is inserted into the positioning sleeve, so that the keyway of the ball screw nut blank is aligned with the protrusion. The angular positioning is achieved by the cooperation between the protrusion and the keyway. Then, the locking sleeve is put on the remaining shaft section of the workpiece and tightened on the positioning sleeve. The mating hole of the positioning sleeve and the outer circle of the workpiece shaft section achieve radial positioning of the workpiece. The positioning sleeve and the locking sleeve cooperate to clamp the workpiece flange left and right to achieve axial positioning of the workpiece. Thus, this special tooling is used to clamp the ball screw nut blank, and this clamping has axial positioning, radial positioning and angular positioning.

[0008] In addition, since the workpiece clamping is actually applied to the workpiece flange, the workpiece shaft section and the corresponding mating hole are both clearance fit, thus ensuring that the surface of the workpiece shaft section will not be damaged by clamping.

[0009] Preferably, as an improvement, the positioning sleeve is provided with an external thread, and the locking sleeve is provided with a mating internal thread.

[0010] Preferably, as an improvement, the diameter of the clamping section on the positioning sleeve for clamping on the chuck is larger than the diameter of the external thread on the positioning sleeve.

[0011] Preferably, as an improvement, the locking sleeve has a boss with an outer contour of a regular polygon or parallelogram on the end face away from the positioning sleeve. The boss facilitates the application of external force from the regular polygon or parallelogram boss when the locking sleeve is locked onto the positioning sleeve.

[0012] Preferably, as an improvement, the outer contour of the boss is square.

[0013] Preferably, as an improvement, the chuck is a three-jaw chuck. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the clamping device according to an embodiment of the present utility model.

[0015] Figure 2 for Figure 1 The right view.

[0016] Figure 3 for Figure 1 A radial sectional view (sectioned at the keyway location of the workpiece).

[0017] Figure 4 for Figure 2 A rotating sectional view of AA (showing that the ball screw thread blank already has internal threads).

[0018] Figure 5 This is a three-dimensional structural diagram of the positioning sleeve in an embodiment of the present utility model.

[0019] Figure 6 This is a three-dimensional structural diagram of the locking sleeve in an embodiment of the present invention.

[0020] Figure 7 This is a schematic diagram illustrating the use of two sets of ball screw nut machining fixtures of different specifications to clamp workpieces at different machining stages in an embodiment of this utility model.

[0021] Figure 8 This is a cross-sectional view of the product to which this utility model embodiment is addressed.

[0022] Figure 9 This is a right view of the product to which this utility model embodiment is addressed.

[0023] Figure 10 This is a left view of the product to which this utility model embodiment is addressed.

[0024] The reference numerals in the accompanying drawings include: workpiece 1, thread start point 10, keyway on flange 11, locking sleeve 2, boss 21, positioning sleeve 3, protrusion 31, chuck 4, and chuck 5. Detailed Implementation

[0025] The following detailed description illustrates the specific implementation method: The basic implementation examples are as follows: Figures 1 to 7 As shown.

[0026] Combination Figure 1 A clamping device includes a chuck 5 on a machine tool and a ball screw nut machining fixture clamped by the chuck 5. The chuck 5 is provided with a plurality of jaws 4 that can move closer to or further away from each other. In this embodiment, the chuck 5 is a three-jaw chuck 5.

[0027] The ball screw nut machining fixture includes a coaxial positioning sleeve 3 and a locking sleeve 2 that can be threadedly connected. The positioning sleeve 3 has an integrally formed external thread, and the locking sleeve 2 has an internal thread that matches the external thread.

[0028] Both the positioning sleeve 3 and the locking sleeve 2 have mating holes machined in their central holes. The mating holes on the positioning sleeve 3 and the locking sleeve 2 are respectively used to make clearance fits with two shaft sections of different diameters of the ball screw nut blank. The end face of the positioning sleeve 3 facing the locking sleeve 2 has a protrusion 31 formed. The protrusion 31 is used to be inserted into the keyway 11 on the flange of the ball screw nut blank. The protrusion 31 and the keyway 11 are in a concave-convex fit. The flange of the ball screw nut blank with the keyway 11 is clamped between the positioning sleeve 3 and the locking sleeve 2.

[0029] The diameter of the clamping section on the positioning sleeve 3, which is used to clamp the chuck 5, is larger than the diameter of the external thread on the positioning sleeve 3, so as to facilitate the clamping of the positioning sleeve 3 by the chuck 5 and also to facilitate the locking of the locking sleeve 2 on the positioning sleeve 3.

[0030] The locking sleeve 2 has a square boss 21 on its end face away from the positioning sleeve 3. The boss 21 allows the locking sleeve 2 to be quickly locked onto the positioning sleeve 3 with the help of a sleeve or other screwing tool.

[0031] Before machining, the positioning sleeve 3 is fixedly clamped on the chuck 5 of the machine tool. Then, the ball screw nut blank (i.e., the workpiece) is inserted into the positioning sleeve 3, so that the keyway 11 of the ball screw nut blank is aligned with the protrusion 31. The angular positioning is achieved by the cooperation between the protrusion 31 and the keyway 11. Then, the locking sleeve 2 is put on the remaining shaft section of the workpiece and tightened on the positioning sleeve 3. The mating hole of the positioning sleeve 3 and the outer circle of the workpiece shaft section achieve radial positioning of the workpiece. The positioning sleeve 3 and the locking sleeve 2 cooperate to clamp the workpiece flange left and right to achieve axial positioning of the workpiece. Thus, the ball screw nut blank is clamped by this special tooling, and the clamping has axial positioning, radial positioning and angular positioning.

[0032] In this embodiment, by replacing the positioning sleeve 3 and locking sleeve 2 with corresponding mating dimensions, the ball screw nut blank with a stepped inner through hole and flange keyway 11 can be machined with three pin holes on the end face, internal thread holes, and mounting holes on the outer periphery of the shaft section. Figure 7 For example, let's first use Figure 7 A set of positioning sleeves 3 and locking sleeves 2 on the left side clamps the workpiece, enabling the machining of the three pin holes on the end face of the large shaft section. Then, the workpiece with the machined pin holes is transferred to... Figure 7 On the right side, a set of positioning sleeve 3 and clamping sleeve, on Figure 7 After the clamping device on the right clamps the workpiece, it can be processed sequentially by machining the internal thread and the mounting hole.

[0033] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A machining fixture for ball screw nuts, characterized in that: It includes a coaxial positioning sleeve and a locking sleeve that can be threaded together. Both the positioning sleeve and the locking sleeve are provided with mating holes. The mating holes on the positioning sleeve and the locking sleeve are respectively used to make clearance fits with two shaft sections of different diameters of the ball screw nut blank. The end face of the positioning sleeve facing the locking sleeve has a protrusion. The protrusion is used to insert into the keyway on the flange of the ball screw nut blank. The protrusion and the keyway make a concave-convex fit. The flange of the ball screw nut blank with the keyway is clamped between the positioning sleeve and the locking sleeve.

2. The machining fixture for a ball screw nut according to claim 1, characterized in that: The positioning sleeve has an external thread, and the locking sleeve has a mating internal thread.

3. The machining fixture for a ball screw nut according to claim 2, characterized in that: The diameter of the clamping section on the positioning sleeve used for clamping onto the chuck is larger than the diameter of the external thread on the positioning sleeve.

4. The machining fixture for a ball screw nut according to claim 1, characterized in that: The locking sleeve has a boss on its end face away from the positioning sleeve, with an outer contour of a regular polygon or a parallelogram.

5. The machining fixture for a ball screw nut according to claim 4, characterized in that: The outer contour of the boss is square.

6. A clamping device, comprising a chuck, characterized in that: It also includes the ball screw nut machining fixture as described in any one of claims 1-5, wherein the chuck is used to hold the positioning sleeve.

7. The clamping device according to claim 6, characterized in that: The chuck is a three-jaw chuck.

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