Cylindrical cam profile polishing tool

Abstract

The invention relates to a profile polishing tool, in particular to a polishing tool for a cylindrical cam profile. A cylindrical cam profile polishing tool comprises a motor, a transmission assembly, a base assembly, an elastic piece and a mandrel assembly. The motor, the transmission assembly and the mandrel assembly are installed on the base assembly, and the motor provides power for the transmission assembly. The transmission assembly drives the mandrel assembly to rotate; a cylindrical cam to be polished is installed at one end of the mandrel assembly. The elastic piece is sleeved on the mandrel assembly and can be compressed under the action of the mandrel assembly; the tool is matched with the polishing rod assembly to achieve polishing of the cylindrical cam profile. The polishing rod assembly is installed on the machine tool, and louvre blades at the end of the polishing rod assembly are attached to the cylindrical cam profile to be polished. Compared with the prior art, the tool has the following advantages that the tool achieves uniform-speed and uniform-quantity polishing of a molded surface through the fitting function of the built-in cam set, the polishing quality can be improved to a great extent, the reworking probability is reduced, and meanwhile the polishing efficiency is greatly improved.

Description

Technical Field

[0001] The invention relates to a profile polishing tool, in particular to a polishing tool for a cylindrical cam profile. Background Art

[0002] Cylindrical cams are common parts in landing gear struts with turning functions. The cam profile is the key feature for controlling turning and centering, so generally there is a high roughness requirement. The traditional processing method is to use CNC milling and then repeated coloring and polishing by fitters with profiling tools. This processing method is greatly affected by the operator's personal level and it is difficult to ensure a stable quality level and processing efficiency. Summary of the invention

[0003] The purpose of the present invention is to provide a cylindrical cam profile polishing tool, which can effectively improve the efficiency and quality of the cylindrical cam profile polishing.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a cylindrical cam surface polishing tool, including a motor, a transmission assembly, a base assembly, an elastic member and a spindle assembly; the motor, the transmission assembly and the spindle assembly are installed on the base assembly, and the motor provides power for the transmission assembly; the transmission assembly drives the spindle assembly to rotate; the cylindrical cam to be polished is installed at one end of the spindle assembly; the elastic member is sleeved on the spindle assembly and can be compressed under the action of the spindle assembly; the tooling realizes the polishing of the cylindrical cam surface with the cooperation of the polishing rod assembly; the polishing rod assembly is installed on the machine tool, and the louver blades at its end are attached to the cylindrical cam surface to be polished.

[0005] Preferably, the spindle assembly includes a spindle, a gear, and a cam A; the spindle is installed on ears arranged opposite to the base assembly, and its two ends respectively pass through the ears; the gear is installed on the spindle located between the ears, and can drive the spindle to rotate; a mounting portion is provided at one end of the spindle for mounting a cylindrical cam; cam A is mounted and fixed on the spindle on the other side of the mounting portion, and engages with cam B on the base assembly; the elastic member is mounted on the spindle and is located between the gear and the ear; when the spindle rotates under the action of the gear, cam A slides along the edge of cam B.

[0006] Preferably, the profiles of cam A and cam B are consistent with the profile of the cylindrical cam to be polished; in the initial state, the profile of the cylindrical cam to be polished is flush with the profiles of cam A and cam B.

[0007] Preferably, the mounting portion is a three-jaw chuck.

[0008] Preferably, the spindle is a stepped shaft, the length of which is greater than the compressed length of the elastic member; and the mounting portion is located at the end of the main shaft.

[0009] Preferably, the base assembly includes a base, a cam B, and a bearing; ears are arranged at relative positions on the upper surface of the base, mounting holes are opened in the ears, the mounting holes are positioned relatively, and the bearing is fixed in the mounting holes; the cam B is installed on the outside of one of the ears, and its axis is on the same straight line as the center of the mounting hole.

[0010] Preferably, the base assembly further comprises a motor mounting bracket for mounting the motor, which is located on the same side of the two ear pieces.

[0011] Preferably, the transmission assembly is a turbine, which is connected to the output shaft of the motor and meshes with the gear of the spindle assembly.

[0012] Preferably, the thickness of the gear is greater than the compressed length of the elastic member.

[0013] Preferably, the polishing rod assembly includes a louver, a fastening nut, an elastic collet, an extension rod and a tool handle; the mounting axis of the louver is installed and fixed at one end of the extension rod through the fastening nut and the elastic collet; the tool handle is installed at the other end of the extension rod and serves as the mounting part of the polishing rod assembly and the machine tool.

[0014] How to use the tool: The tool needs to be used in conjunction with a machine tool with a workbench and a rotating spindle (either an ordinary milling machine or a drilling machine). Install the cylindrical cam to be polished on the three-jaw chuck of the tool, and then install the polishing rod assembly for polishing on the machine tool. After properly adjusting the position of the shutter blades, start the motor and the polishing rod assembly in sequence to achieve the polishing of the cylindrical cam surface.

[0015] Compared with the prior art, the present invention has the following advantages: the tooling realizes uniform speed and uniform amount of polishing of the profile through the built-in cam group fitting function, which can greatly improve the polishing quality, reduce the probability of rework, and greatly improve the polishing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the structure of an embodiment of the present invention (including a polishing rod assembly); Figure 2 It is a schematic diagram of the exploded structure of an embodiment of the present invention (excluding the motor and turbine); Figure 3 is a schematic structural diagram of a polishing rod assembly in an embodiment of the present invention; Figure 4 is a schematic diagram of the structure of a spindle assembly in an embodiment of the present invention; Figure 5 is a schematic diagram of the structure of a base assembly in an embodiment of the present invention; Figure 6 It is a schematic diagram of the working mode of an embodiment of the present invention; Figure 7 yes Figure 6 Schematic diagram of the state of the shutter blades in the middle A part on the processing surface; Figure 1 Among them, 1. motor; 2. turbine; 3. cylindrical cam to be polished; 5. spring; 8. spindle assembly; Figure 2 Among them, 4, base assembly; 5, spring; 8, spindle assembly; Figure 3 Among them, 6, polishing rod assembly; 6-1, shutter blade; 6-2, fastening nut; 6-3, spring chuck; 6-4, extension rod; 6-5, tool handle; Figure 4 Among them, 8-1, cam A; 8-2, fixing screw; 8-3, spindle; 8-4, gear; 8-5, key; 8-6, quick-change stop pin; 3, cylindrical cam to be polished; Figure 5 Among them, 4-1, fixing screw; 4-2, cam B; 4-3, positioning pin; 4-4, bearing A; 4-5, bearing B; 4-6, base; Figure 7 In the figure, 6-1, shutter blades; 7, cylindrical cam profile after unfolding. DETAILED DESCRIPTION

[0017] The following is combined with Figure 1-7 The present invention is further described as follows: A cylindrical cam surface polishing tool needs to be used in conjunction with a machine tool with a workbench and a rotating spindle (a common milling machine or a drilling machine can be used); Figure 1-2 As shown, the tooling includes a motor 1, a transmission assembly, a base assembly 4, a spring 5 and a spindle assembly 8; after the spindle assembly 8, the spring 5 and the base assembly 4 are combined together and then the motor and the transmission assembly are installed, the overall assembly of the equipment is completed; at the same time, the tooling also needs to be coordinated with the polishing rod assembly 6 installed on the main shaft of the machine tool, and the louver blades at the end of the polishing rod assembly 6 are attached to the surface of the cylindrical cam 3 to be polished (the thick solid line is the surface to be polished) to achieve polishing of the cylindrical cam surface.

[0018] like Figure 3 As shown, the polishing rod assembly includes a louver 6-1, a fastening nut 6-2, an elastic collet 6-3, an extension rod 6-4 and a tool handle 6-5; the mounting axis of the louver 6-1 passes through the fastening nut 6-2 and the elastic collet 6-3 and is fixed to one end of the extension rod 6-4; the tool handle 6-5 is installed at the other end of the extension rod and serves as the mounting part of the polishing rod assembly and the machine tool.

[0019] like Figure 4As shown, the spindle assembly 8 includes a spindle 8-3, a gear 8-4, and a cam A8-1; the spindle 8-3 is mounted on ears arranged opposite to the base assembly 4, and its two ends respectively pass through the ears; the gear 8-4 is mounted on the spindle 8-3 located between the ears, and can drive the spindle to rotate; a mounting portion is provided at one end of the spindle 8-3 for mounting a cylindrical cam, and in this embodiment, the mounting portion is a three-claw chuck; the cam A8-1 is mounted and fixed on the spindle 8-3 on the other side of the mounting portion, and engages with the cam B on the base assembly 4; the spring 5 is sleeved on the spindle 8-3, and is located between the gear 8-4 and the ear; when the spindle rotates under the action of the gear 8-4, the cam A8-1 slides along the edge of the cam B.

[0020] As a preferred implementation of this embodiment, the spindle 8-3 is a stepped shaft, and its length is greater than the compressed length of the spring 5; the three-claw chuck is located at the end of the large shaft; and the gear 8-4 is close to the end of the small shaft.

[0021] As a preferred implementation scheme of this embodiment, the spindle assembly also includes a fixing screw 8-2, a key 8-5 and a quick-change stop pin 8-6; the fixing screw 8-2 is adapted to the mounting holes opened on the cam A8-1 and the spindle 8-3, so that the cam A8-1 is installed and fixed on the spindle 8-3; the key 8-5 cooperates with the gear 8-4 and the spindle 8-3 to perform starting and stopping functions; the gear 8-4 is installed and fixed on the spindle 8-3 through the quick-change stop pin 8-6.

[0022] like Figure 5 As shown, the base assembly 4 includes a cam B4-2, a bearing A4-4, a bearing B4-5, and a base 4-6; ears are arranged at relative positions on the upper surface of the base 4-6, and mounting holes are provided in the ears. The mounting holes are positioned relative to each other, and the centers of the two mounting holes are on the same straight line; the bearing A4-4 and the bearing B4-5 are respectively installed and fixed in the mounting holes, the bearing A4-4 is close to the large shaft end of the spindle 8-3, and the bearing B4-5 is close to the small shaft end of the spindle 8-3; the cam B4-2 is installed on the outside of one of the ears, and the ear is the ear for installing the bearing A4-4, and its axis is on the same straight line with the center of the mounting hole.

[0023] As a preferred implementation scheme of this embodiment, the base assembly 4 also includes a fixing screw 4-1 and a positioning pin 4-3; a positioning hole and a mounting hole are provided on the cam B4-2 and the ear piece installed therewith, and the fixing screw 4-1 is adapted to the mounting hole so that the cam B4-2 is installed on the ear piece; the positioning pin 4-3 is adapted to the positioning hole and is used to position the cam B4-2 and the ear piece.

[0024] As a preferred implementation of this embodiment, the profiles of cam A8-1 and cam B4-2 are consistent with the cylindrical cam profile 3 to be polished; in the initial state, the cylindrical cam profile to be polished is flush with the profiles of cam A and cam B.

[0025] As a preferred implementation of this embodiment, the base assembly further includes a motor mounting bracket for mounting the motor 1, which is located on the same side of the two ears.

[0026] As a preferred implementation of this embodiment, the transmission assembly is a turbine 2, which is connected to the motor output shaft and meshes with the gear 8-4 of the spindle assembly 8.

[0027] As a preferred implementation of this embodiment, Figure 6 As shown, the thickness of the gear 8 - 4 is greater than the compressed length of the spring 5 .

[0028] like Figure 7 As shown, in order to effectively polish the cylindrical cam surface, the shutter blade 6-1 needs to be appropriately close to the profile (ie, the cylindrical cam profile 7 after unfolding) during the processing, so that the shutter blade has a certain deformation.

[0029] The main working principle of the tooling is: the cam group formed by cam A8-1 and cam B4-2 and the rebound function of spring 5 drives the spindle to rotate while making axial reciprocating motion according to the surface characteristics of the cam group, thereby ensuring that the surface of the cylindrical cam 3 to be polished is a simple rotational motion relative to the polishing rod.

[0030] How to use this tool: 1. Install the tooling on the machine tool (either ordinary milling machine or drilling machine); 2. Install the cylindrical cam 3 to be polished on the three-jaw chuck of the tooling, and visually calibrate the profile of the cylindrical cam 3 to be polished to be flush with the profile of the cam group (cam A, cam B) on the tooling; 3. Install the polishing rod assembly 6 on the main shaft of the machine tool, adjust the position so that the shutter blades on the polishing rod assembly are attached to the surface of the cylindrical cam 3 to be polished (apply appropriate compression); 4. Start the machine tool spindle and the motor on the tooling in sequence to start the polishing operation; 5. After polishing, stop the spindle and motor, and remove the cylindrical cam.

[0031] In the absence of ordinary milling machines or drilling machines to provide spindle rotation, the tooling can be placed on a bench, and polishing operations can be performed by clamping the polishing rod assembly with tools such as air guns and electric grinders. In addition, the polishing of the louver blades can generally achieve a roughness of Ra≤0.4. If the roughness needs to be further improved, the louver blades can be replaced with scouring pads or wool felt after polishing, and further polished with polishing paste.

[0032] The above embodiments are only preferred implementations of the present invention and do not constitute a limitation of the present invention. Any extensions and modifications made by ordinary technicians in this field without departing from the principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A cylindrical cam surface polishing tool, characterized in that: It includes a motor, a transmission assembly, a base assembly, an elastic part and a spindle assembly; the motor, the transmission assembly and the spindle assembly are installed on the base assembly, and the motor provides power for the transmission assembly; the transmission assembly drives the spindle assembly to rotate; the cylindrical cam to be polished is installed at one end of the spindle assembly; the elastic part is sleeved on the spindle assembly and can be compressed under the action of the spindle assembly; the tooling realizes the polishing of the cylindrical cam surface with the cooperation of the polishing rod assembly; the polishing rod assembly is installed on the machine tool, and the louver blade at its end is attached to the cylindrical cam surface to be polished.

2. The cylindrical cam profile polishing tool according to claim 1, characterized in that: The spindle assembly includes a spindle, a gear, and a cam A; the spindle is installed on ears arranged opposite to the base assembly, and its two ends respectively pass through the ears; the gear is installed on the spindle located between the ears, and can drive the spindle to rotate; a mounting portion is provided at one end of the spindle for mounting a cylindrical cam; cam A is mounted and fixed on the spindle on the other side of the mounting portion, and engages with cam B on the base assembly; the elastic part is sleeved on the spindle and is located between the gear and the ear; when the spindle rotates under the action of the gear, cam A slides along the edge of cam B.

3. The cylindrical cam profile polishing tool according to claim 2, characterized in that: The profiles of cam A and cam B are consistent with the profile of the cylindrical cam to be polished; in the initial state, the profile of the cylindrical cam to be polished is flush with the profiles of cam A and cam B.

4. The cylindrical cam profile polishing tool according to claim 2, characterized in that: The mounting part is a three-jaw chuck.

5. The cylindrical cam profile polishing tool according to claim 2, characterized in that: The mandrel is a stepped shaft, the length of which is greater than the compressed length of the elastic member; and the mounting portion is located at the end of the main shaft.

6. The cylindrical cam profile polishing tool according to claim 1, characterized in that: The base assembly includes a base, a cam B, and a bearing; ears are arranged at relative positions on the upper surface of the base, mounting holes are opened in the ears, the mounting holes are relatively located, and the bearing is fixed in the mounting holes; the cam B is installed on the outside of one of the ears, and its axis is on the same straight line as the center of the mounting hole.

7. The cylindrical cam profile polishing tool according to claim 6, characterized in that: The base assembly also includes a motor mounting bracket for mounting the motor, which is located on the same side of the two ears.

8. The cylindrical cam profile polishing tool according to claim 1, characterized in that: The transmission assembly is a turbine, which is connected to the output shaft of the motor and meshes with the gear of the spindle assembly.

9. The cylindrical cam profile polishing tool according to claim 8, characterized in that: The thickness of the gear is greater than the compressed length of the elastic member.

10. The cylindrical cam profile polishing tool according to claim 1, characterized in that: The polishing rod assembly includes a louver blade, a fastening nut, an elastic collet, an extension rod and a tool handle; the mounting shaft of the louver blade passes through the fastening nut and the elastic collet and is fixed to one end of the extension rod; the tool handle is installed at the other end of the extension rod as the mounting part of the polishing rod assembly and the machine tool.

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