Positioning tool for milling machine

Abstract

A kind of positioning tool for milling machine, including support plate, several supporting nails and driving part;Support plate one side is support plane, and the material guide groove with two ends opening is provided on support plane, and installation hole is provided on its material guide groove bottom;Several assembly holes are respectively provided on the two sides of the material guide groove of support plate towards the side of support plane;Several supporting nails are respectively slidably arranged in several assembly holes;Driving part is arranged in assembly hole, and is connected to supporting nail, and driving supporting nail slides along assembly hole.Solve the problem that it is difficult to switch different types of positioning member in real time, and the supporting component of fixed structure is difficult to adjust flexibly.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, and more specifically, to a positioning fixture for a milling machine. Background Technology

[0002] In milling, the positioning accuracy of the workpiece directly affects the machining quality. Support plates and support pins are commonly used positioning elements. Their application scenarios vary depending on factors such as the surface condition of the workpiece, positioning accuracy requirements, and structural characteristics. They are often used for six-point positioning of the workpiece, restricting its six degrees of freedom for positioning. When the workpiece is positioned on a plane, support plates and support pins are commonly used. In use, the support plate or support pins are placed in contact with the workpiece for positioning. When using support pins, generally six support pins are used to position the workpiece at each of its six degrees of freedom. The degrees of freedom are restricted as follows: movement along the x, y, and z axes, and rotation around the x, y, and z axes. Three support pins are used to hold the bottom of the workpiece and are not collinear, restricting movement along the z-axis and rotation around the x and y axes, respectively. Two support pins are used to hold the side of the workpiece, restricting movement along the x-axis and rotation around the z-axis, respectively. One support pin is used to hold the other adjacent side of the workpiece, restricting movement along the y-axis. When using support plates for positioning, a narrow support plate can restrict two degrees of freedom, equivalent to two support pins, while a wide support plate can restrict three degrees of freedom, equivalent to three support pins.

[0003] When changing workpieces or having different processing requirements during processing, it is necessary to replace and disassemble different positioning parts in real time, which makes it difficult to switch quickly and easily in real time.

[0004] Moreover, traditional milling machine positioning fixtures usually use fixed support positioning elements, which are difficult to adjust flexibly according to the size, shape and processing position of different workpieces, resulting in poor positioning adaptability. Utility Model Content

[0005] The purpose of this invention is to provide a positioning fixture for milling machines, which solves the problems of difficulty in switching between different types of positioning parts in real time and difficulty in flexibly adjusting the support components of the fixed structure.

[0006] The embodiments of this utility model are achieved through the following technical solutions:

[0007] A positioning fixture for a milling machine, comprising:

[0008] The support plate has a support plane on one side, and a guide groove with openings at both ends is provided on the support plane. The bottom of the guide groove is provided with mounting holes. Several assembly holes are provided on both sides of the guide groove of the support plate facing the support plane.

[0009] Several support pins are slidably disposed in several of the aforementioned assembly holes;

[0010] The drive unit is located in the assembly hole and connected to the support pin, driving the support pin to slide along the assembly hole.

[0011] The driving unit includes a sleeve connected to a driver, which drives the sleeve. The sleeve is disposed in an assembly hole and has threads on its inner sidewall. The support pin is disposed in the sleeve and has threads on its sidewall that engage with the threads on the inner sidewall of the sleeve. A limiting strip is provided on the sidewall of the opening of the assembly hole along the axis of the assembly hole. A limiting groove is provided on the sidewall of the support pin along the axis of the support pin. The limiting groove is slidably disposed on the limiting strip to restrict the support pin from rotating around the axis and moving along the limiting strip. When the driver drives the sleeve to rotate, the support pin moves along the limiting strip due to the thread engagement.

[0012] The driver includes a worm gear, a worm, a rotating shaft, and a handle; the worm gear is located in the assembly hole and is disposed at the bottom of the sleeve; a control hole is provided through one side of the support plate and communicates with the bottom of the assembly hole; the worm is rotatably disposed in the control hole and meshes with the worm gear; by rotating the worm, the worm gear and the sleeve are controlled to rotate, thereby driving the support pin to move along the assembly hole.

[0013] It also includes a control rod, which is located in the control hole and connected to one end of the worm gear.

[0014] The control lever includes a rotating shaft and a handle; one end of the rotating shaft is connected to one end of the worm gear, and the other end of the rotating shaft extends out of the control hole and is connected to the handle.

[0015] The support plate has fixed support plates on two pairs of sides adjacent to the support plane, and mounting holes for fixing are provided on them.

[0016] The feed trough is provided with inclined support surfaces on both sides near the support plane.

[0017] The technical solution of this utility model embodiment has at least the following advantages and beneficial effects:

[0018] 1. This utility model discloses a positioning fixture for a milling machine. The supporting plane of the support plate can be used to position workpieces with large flat areas by contacting the flat surface of the workpiece with the supporting plane for positioning. When positioning workpieces with point contact or small area contact is required, the support pin can be controlled to extend from the supporting plane, and then the workpiece can be positioned by contacting the end face of the support pin. Moreover, for some cylindrical workpieces, the arc-shaped sidewall can be positioned by contacting the inclined surface of the support. Different types of positioning methods can be switched in real time and quickly according to the processing stage or requirements of the workpiece.

[0019] 2. The positioning fixture for a milling machine of this utility model has a support pin that can be slidably adjusted along the assembly hole through the drive unit. It can quickly adjust the support position according to the actual size of the workpiece and the processing requirements, which significantly improves the adaptability of the fixture to different workpieces and reduces the fixture adjustment time during changeover processing.

[0020] 3. This utility model discloses a positioning fixture for a milling machine. The drive unit adopts a worm gear transmission and threaded engagement structure. By rotating the worm gear through the handle, the worm gear and sleeve are rotated. The rotational motion is converted into the linear motion of the support pin through the threaded pair. With the help of the limiting strip and limiting groove, the rotation of the support pin is restricted, realizing high-precision positioning adjustment of the support pin. The self-locking characteristics of the worm gear transmission and threaded engagement are utilized to ensure that the position of the support pin remains unchanged during the machining process, thereby improving the positioning accuracy of the workpiece. Furthermore, the design of the control lever and handle allows the operator to complete the position adjustment of the support pin through a simple rotational action without the need for additional tools, reducing the difficulty of operation and improving the efficiency of the fixture.

[0021] 4. This utility model provides a positioning fixture for a milling machine, which offers multiple ways to install and fix the support plate. When the workpiece needs to be positioned vertically, the mounting holes at the bottom of the guide groove of the support plate are fixed with bolts or other methods. When the workpiece needs to be positioned horizontally, the fixed support plates on both sides of the support plate can be firmly installed on the milling machine worktable through the mounting holes, so that the support plane of the support plate can be placed vertically to position the workpiece horizontally. Through multiple installation methods, six-point positioning of the workpiece can be achieved, covering its six degrees of freedom. Furthermore, the guide groove facilitates chip removal during processing, preventing chip accumulation from affecting positioning accuracy. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 It is attached Figure 1 Sectional view at point aa;

[0024] Figure 3 This is a partial schematic diagram of the drive unit of the support pin.

[0025] In the figure, 101-support plane, 102-guide groove, 103-fixed support plate, 104-mounting hole, 201-support pin, 202-limiting groove, 203-sleeve, 204-worm gear, 205-worm, 206-rotating shaft, 207-handle. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0028] like Figure 1 and 2 As shown, a positioning fixture for a milling machine includes a support plate, several support pins 201, and a drive unit. The top surface of the support plate is a support plane 101, used for direct contact with the workpiece for positioning. To facilitate chip removal during workpiece machining, a guide groove 102 with openings at both ends is provided on the support plane 101. Chips generated during machining can be discharged along the guide groove 102 from its openings at both ends. Furthermore, the support plate needs to achieve positioning with up to three degrees of freedom; therefore, the guide groove 102 is located in the middle of the support plane 101, allowing the two side support planes 101 of the guide groove 102 to contact the workpiece surface respectively, thereby achieving positioning with up to three degrees of freedom. The support plate needs to be fixed. Mounting holes 104 are provided at the bottom of its guide groove 102. The support plate can be firmly installed on the milling machine worktable using bolts or other methods through the mounting holes 104. It should be noted that bolt connections and other methods for fixing the support plate to the milling machine worktable are common fixing methods used by those skilled in the art and are not improvements in this embodiment; therefore, they will not be described in detail here. Support pins 201 need to be installed on the support plane 101 of the support plate, and the support pins 201 need to be able to achieve positioning with up to three degrees of freedom. Therefore, several assembly holes are provided on the support planes 101 on both sides of the guide groove 102 for installing the support pins 201.

[0029] The drive unit is located in the assembly hole and connected to the support pin 201. It is used to drive the support pin 201 to slide along the assembly hole. When only the support plane 101 of the support plate needs to be positioned, the drive unit can control the support pin 201 to be retracted into the assembly hole, so that the top of the support pin 201 is flush with the support plane 101 or sinks into the assembly hole, thereby avoiding the support pin 201 from interfering with the positioning of the support plane 101. When the support pin 201 needs to be positioned, the drive unit can control the support pin 201 to extend out of the assembly hole, so that the workpiece contacts and is positioned with the end face of the support pin 201.

[0030] like Figure 1 As shown, when the support plate needs to be able to position the workpiece in the horizontal direction, the support plane 101 needs to be able to be placed vertically.

[0031] In one embodiment, a fixed support plate 103 is provided on two pairs of side surfaces adjacent to the support plate and the support plane 101. The fixed support plate 103 is provided with mounting holes 104 for fixing. The support plane 101 can be placed vertically, and then the fixed support plate 103 is made to contact the milling machine table and then fixed through the mounting holes 104 on the fixed support plate 103.

[0032] like Figure 2 and 3 As shown, the movement of the support pin 201 needs to be controlled by the drive unit. Therefore, the control part of the drive unit cannot be set on one side and the opposite side of the support plane 101. Instead, the control part of the drive unit is set on the adjacent side of the support plane 101. Since the support plane 101 needs to be placed vertically, the control part of the fixed support plate 103 cannot be set on the adjacent side of the fixed support plate 103. Therefore, the control part of the drive unit is set on the side where the fixed support plate 103 is located.

[0033] In one embodiment, the driving unit includes a sleeve 203 connected to a driver, which drives the sleeve 203 to rotate. The driver's control part is located on the side with the fixed support plate 103. The sleeve 203 is disposed in the assembly hole, and its inner wall is threaded. The support pin 201 is disposed in the sleeve 203, and its side wall is threaded to engage with the thread on the inner wall of the sleeve 203. By restricting the rotation of the support pin 201 and controlling the rotation of the sleeve 203, the movement of the support pin 201 along the axis of the sleeve 203 can be controlled. Rotation; A limiting strip along the axis of the assembly hole is provided on the side wall of the opening of the assembly hole, and a limiting groove 202 along the axis of the support pin 201 is provided on the side wall of the support pin 201. The support pin 201 is slidably disposed on the limiting strip through the limiting groove 202, thereby restricting the support pin 201 from rotating around the axis and allowing it to move up and down along the limiting strip; Therefore, when the control driver drives the sleeve 203 to rotate, due to the thread engagement and the cooperation of the limiting strip and the limiting groove 202, the support pin 201 cannot rotate around its axis, thereby allowing the support pin 201 to move along the limiting strip;

[0034] Since the support pin 201 needs to be controlled from one side of the fixed support plate 103, the drive includes a worm gear 204, a worm 205, a rotating shaft 206, and a handle 207. The worm gear 204 is located in the mounting hole and is located at the bottom of the sleeve 203. The movement of the support pin 201 can be controlled by controlling the rotation of the worm gear 204. A control hole is provided through one side of the fixed support plate 103 and is connected to the position of the worm gear 204 at the bottom of the mounting hole. The worm 205 is rotatably placed in the control hole and meshes with the worm gear 204. A control rod is provided at one end of the worm 205 and extends along the control hole. By operating the control rod to rotate on the outside of the support plate, the sleeve 203 can be rotated with the worm gear 204 through the meshing of the worm gear 204 and the worm 205, thereby controlling the movement of the support pin 201.

[0035] Since the control lever needs to be easy to operate, the control lever is composed of a rotating shaft 206 and a handle 207. One end of the rotating shaft 206 is connected to one end of the worm gear 205, and the other end of the rotating shaft 206 extends out of the control hole and is connected to the handle 207. It can be operated by controlling the handle 207. It should be noted that the control by the handle 207 is a control method commonly used by those in the art, and it is not an improvement of this embodiment. It will not be described in detail here.

[0036] The working principle of this embodiment is as follows:

[0037] This utility model discloses a positioning fixture for a milling machine. When a support plate needs to be fixed, an installation hole 104 is provided at the bottom of its guide groove 102. The support plate can be firmly installed on the milling machine worktable through the installation hole 104 by means of bolt connection, thereby achieving the positioning of the workpiece in the vertical direction. The support plane 101 is placed vertically, and then the fixed support plate 103 is made to contact the milling machine worktable. Then, it is fixed through the installation hole 104 on the fixed support plate 103, thereby achieving the positioning of the workpiece in the horizontal direction. When it is necessary to position workpieces with some point contact or small area contact, the support pin 201 can be controlled to extend from the support plane 101. By rotating the operating handle 207, the worm gear 205 is driven. Then, through the meshing of the worm wheel 204 and the worm gear 205, the sleeve 203 is rotated with the worm wheel 204, thereby controlling the movement of the support pin 201, and then the workpiece is positioned by contacting the end face of the support pin 201. Moreover, for some cylindrical workpieces, the arc-shaped sidewall can be positioned by contacting the inclined support surface.

[0038] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A positioning fixture for a milling machine, characterized in that, include: The support plate has a support plane on one side, and a guide groove with openings at both ends is provided on the support plane. The bottom of the guide groove is provided with mounting holes. Several assembly holes are provided on both sides of the guide groove of the support plate facing the support plane. Several support pins are slidably disposed in several of the aforementioned assembly holes; The drive unit is located in the assembly hole and connected to the support pin, driving the support pin to slide along the assembly hole.

2. The positioning fixture for a milling machine according to claim 1, characterized in that, The driving unit includes a sleeve connected to a driver, which drives the sleeve. The sleeve is disposed in an assembly hole and has threads on its inner sidewall. The support pin is disposed in the sleeve and has threads on its sidewall that engage with the threads on the inner sidewall of the sleeve. A limiting strip is provided on the sidewall of the opening of the assembly hole along the axis of the assembly hole. A limiting groove is provided on the sidewall of the support pin along the axis of the support pin. The limiting groove is slidably disposed on the limiting strip to restrict the support pin from rotating around the axis and moving along the limiting strip. When the driver drives the sleeve to rotate, the support pin moves along the limiting strip due to the thread engagement.

3. A positioning fixture for a milling machine according to claim 2, characterized in that, The driver includes a worm gear, a worm, a rotating shaft, and a handle; the worm gear is located in the assembly hole and is disposed at the bottom of the sleeve; a control hole is provided through one side of the support plate and communicates with the bottom of the assembly hole; the worm is rotatably disposed in the control hole and meshes with the worm gear; by rotating the worm, the worm gear and the sleeve are controlled to rotate, thereby driving the support pin to move along the assembly hole.

4. A positioning fixture for a milling machine according to claim 3, characterized in that, It also includes a control rod, which is located in the control hole and connected to one end of the worm gear.

5. A positioning fixture for a milling machine according to claim 4, characterized in that, The control lever includes a rotating shaft and a handle; one end of the rotating shaft is connected to one end of the worm gear, and the other end of the rotating shaft extends out of the control hole and is connected to the handle.

6. A positioning fixture for a milling machine according to claim 1, characterized in that, The support plate has fixed support plates on two pairs of sides adjacent to the support plane, and mounting holes for fixing are provided on them.

7. A positioning fixture for a milling machine according to claim 1, characterized in that, The feed trough is provided with inclined support surfaces on both sides near the support plane.

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