Tooth side fillet forming cutter and forming device

Abstract

The utility model discloses a tooth side fillet forming cutter and forming device, including cutterhead and blade, the cutterhead is provided with revolving body structure, a plurality of the blade is provided on the cutterhead with the axis of cutterhead as the center annular, the blade is provided with the processing groove, the processing groove is provided with the processing knife edge, the processing knife edge is provided with the processing knife edge, and the processing knife edge is provided with the processing knife edge. The extension line of the machining tool edge is an arc line, and the extension radius of the machining tool edge corresponds to the fillet radius of the rack. According to the utility model, the cutter head for rotary processing is arranged, the circular-arc-shaped processing knife edge is used for performing circular-arc processing on the side surface of the rack, the position of the rack can be adjusted without rotation, and the circular arc effect of the R-angle surface processed by the processing knife edge is good; the rack only needs to axially move to enable the rotating cutter head to linearly move along the rack, installation and debugging are few, the relative position is stable during machining, the machining efficiency is high, and the yield of machined workpieces is high.

Description

Technical Field

[0001] The utility model relates to the field of automobile parts production, in particular to a tooth side fillet forming tool and a forming device. Background Art

[0002] CNC machine tools are short for computer digitally controlled machine tools. They are high-precision, high-efficiency automated machine tools equipped with a program control system. The processing program sheet is written according to the instruction code and program format specified by the CNC machine tool, and then the content of the program sheet is recorded in the memory (such as RAM, disk), and then input into the CNC device of the CNC machine tool to automatically perform precision processing on the processed parts, thereby commanding the machine tool to process the parts.

[0003] In the process of machining the steering gear rack, after completing the flash removal process on both sides of the rack, it is necessary to further round the corners, i.e., R angle, on both sides of the rack to further reduce the friction between the rack and the contact parts during use. The existing rack R angle processing is generally grinding and milling the R angles on both sides of the rack with a CNC milling machine.

[0004] When grinding the R angle of the rack, the processing time is too long and the equipment utilization rate is low. When the CNC milling machine is used to mill the R angle on both sides, the existing technology generally uses a flat cutter as a processing tool, and the rack is rotated slightly several times and the rack moves back and forth axially for processing. This processing method will make the R angle surface consist of multiple small planes, and the overall arc effect is poor; each time the rack rotates, the flat cutter needs to be installed and debugged with the rack several times to determine the position of the processing surface, so the installation and debugging are difficult and cumbersome; the debugging is prone to deviations, resulting in rack size deviations, damage to the appearance of the workpiece, etc.

[0005] In view of the above-mentioned defects, the inventor of the present invention finally obtained the present invention after a long period of research and practice. Utility Model Content

[0006] In order to solve the above-mentioned technical defects, the technical solution adopted by the utility model is to provide a tooth side fillet forming tool, including a cutter disc and a blade, the cutter disc is configured as a rotating body structure, and a plurality of blades are arranged on the cutter disc in a ring shape with the axis of the cutter disc as the center, and a processing groove is provided on the blade, and a processing edge is provided on the processing groove, and the extension line of the processing edge is a circular arc line, and the extension radius of the processing edge is set corresponding to the fillet radius of the rack.

[0007] Preferably, the blade is configured as a flat plate-like member, the blade is provided with a front side and a back side, the processing groove is provided with arc segments on both the front side and the back side, and the radius of the arc segment on the front side is smaller than the radius of the arc segment on the back side, and the groove wall of the processing groove is inclinedly transitioned from the front side to the back side to form the processing blade with an acute angle structure on the front side.

[0008] Preferably, the processing groove is further provided with straight line segments extending along a straight line on the front and back sides, the straight line segments are connected to the ends of the corresponding arc segments, and the tangents of the straight line segments and the ends of the corresponding arc segments are provided with avoidance angles in the direction away from the processing groove.

[0009] Preferably, the cutter disc is provided with an avoidance groove corresponding to the processing groove, the avoidance groove is arranged in a circular ring shape, and the cross-sectional shape of the avoidance groove is an arc shape, and the cross-sectional radius of the avoidance groove is larger than the radius of the arc segment on the back side.

[0010] Preferably, the cutter disc is annularly provided with a plurality of placement cavities, the blades are arranged in one-to-one correspondence with the placement cavities, the blades are fixedly arranged in the corresponding placement cavities, and the extension direction of the blades away from the axis of the cutter disc forms an acute angle with the radial direction of the axis of the cutter disc.

[0011] Preferably, the placement cavity is provided with a first placement surface, a second placement surface and a third placement surface, the first placement surface, the second placement surface and the third placement surface are all perpendicular to each other, the third placement surface is perpendicular to the axis of the knife disc, the overall shape of the blade is set to be rectangular, the back side is set to fit the first placement surface, and the second placement surface and the third placement surface are both set to fit the surface of the blade.

[0012] Preferably, a limiting strip is arranged on the third placement surface, the limiting strip is arranged parallel to the first placement surface, a limiting groove is formed between the limiting strip and the first placement surface, and a groove width of the limiting groove is equal to or greater than the thickness of the blade.

[0013] Preferably, the forming device includes an installation and adjustment slide rail, a milling slide rail and a rack fixing part, the milling slide rail is arranged on one side or both sides of the installation and adjustment slide rail, the installation and adjustment slide rail is provided with a fixed seat slide, the fixed seat slide can slide freely along the extension direction of the installation and adjustment slide rail, the rack fixing part for fixing the rack is fixedly arranged on the fixed seat slide, the tooth side fillet forming tool is movably connected to the milling slide rail, and the tooth side fillet forming tool is arranged on the side of the rack.

[0014] Preferably, the milling slide is provided with a spindle seat, a rotating spindle and an adjusting motor, the spindle seat slides freely on the milling slide along the extension direction of the milling slide, the adjusting motor is connected to the spindle seat through an adjusting shaft, and the sliding position of the spindle seat on the milling slide is adjusted by the adjusting motor, a connecting hole is provided at the center of the cutter disc, the rotating spindle is fixedly arranged in the connecting hole, and the CNC machine tool is connected to the cutter disc through the rotating spindle.

[0015] Preferably, the extension direction of the installation and adjustment slide rail and the extension direction of the milling machining slide rail are arranged perpendicularly.

[0016] Compared with the prior art, the utility model has the following beneficial effects: the utility model arranges the rotary processing cutter disc, and rounds the corners of the rack side surface through the arc-shaped processing cutting edge. The rack does not need to be rotated for position adjustment, and the R-angle surface arc effect of the processing cutting edge is good. The rack only needs to move axially to make the rotating cutter disc move in a straight line along the rack. There is less installation and debugging, the relative position is stable during processing, the processing efficiency is high, and the yield rate of the workpiece after processing is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional structural view of the tooth side fillet forming tool;

[0018] Figure 2 It is a structural front view of the tooth side fillet forming tool;

[0019] Figure 3 is a three-dimensional structural view of the blade;

[0020] Figure 4 is a structural front view of the blade;

[0021] Figure 5 is a structural side view of the blade;

[0022] Figure 6 is a three-dimensional structural view of the molding device;

[0023] Figure 7 It is a structural front view of the forming device.

[0024] The numbers in the figure represent:

[0025] 1-cutter disc; 2-blade; 3-installation and adjustment slide rail; 4-milling processing slide rail; 5-rack fixing part; 6-fixed seat slide; 7-rack; 11-avoidance groove; 12-placing cavity; 13-connecting hole; 21-processing groove; 22-processing cutting edge; 23-front; 24-back; 25-arc segment; 26-straight segment; 27-first installation hole; 28-installation screw; 41-spindle seat; 42-rotating spindle; 43-adjustment motor; 44-adjustment shaft; 121-first placement surface; 122-third placement surface; 123-limiting strip; 124-limiting groove. DETAILED DESCRIPTION

[0026] The above and other technical features and advantages of the present invention are described in more detail below in conjunction with the accompanying drawings.

[0027] Embodiment 1

[0028] like Figure 1 , Figure 2 As shown, Figure 1 is a three-dimensional structural view of the tooth side fillet forming tool; Figure 2 The tooth side fillet forming tool of the utility model comprises a cutter disc 1 and a blade 2, wherein the cutter disc 1 is configured as a rotating body structure, and a plurality of blades 2 are arranged on the cutter disc 1 in an annular manner with the axis of the cutter disc 1 as the center, and a processing groove 21 is provided on the blade 2, and a processing edge 22 is provided on the processing groove 21, and the extension line of the processing edge 22 is an arc line, and the extension radius of the processing edge 22 is set corresponding to the R angle radius of the rack 7.

[0029] By rotating the cutter disc 1 around its own axis, the multiple processing edges 22 can be rotated around the axis to form an annular processing surface, and the processing surface is fitted to the side of the rack 7, so that the multiple processing edges 22 can mill the side of the rack 7 in turn, thereby realizing the R-angle forming processing operation on one side of the rack 7.

[0030] like Figure 3 , Figure 4 , Figure 5 As shown, Figure 3 is a three-dimensional structural view of the blade; Figure 4 is a structural front view of the blade; Figure 5 It is a structural side view of the blade.

[0031] Preferably, the blade 2 is configured as a flat plate-like member, the blade 2 is provided with a front side 23 and a back side 24, the processing groove 21 is provided with arc segments 25 on both the front side 23 and the back side 24, and the radius of the arc segment 25 on the front side 23 is smaller than the radius of the arc segment 25 on the back side 24, so that the groove wall of the processing groove 21 is inclinedly transitioned from the front side 23 to the back side 24, thereby forming the processing cutting edge 22 with an acute angle structure on the front side 23.

[0032] Generally, the processing groove 21 is further provided with a straight line segment 26 extending along a straight line on the front side 23 and the back side 24, the straight line segment 26 is connected to the end of the corresponding arc segment 25, and the straight line segment 26 and the tangent line of the corresponding arc segment 25 end are provided with a avoidance angle in the direction away from the processing groove 21, so as to avoid interference between other parts of the processing groove 21 and the rack 7 when the processing blade 22 performs side R angle processing on the rack 7. The avoidance angle is generally set to 0° to 7°, so as to ensure the structural strength of the processing groove 21 while avoiding interference.

[0033] The cutter disc 1 is provided with an avoidance groove 11 corresponding to the processing groove 21. The avoidance groove 11 is arranged in a circular ring shape, and the cross-sectional shape of the avoidance groove 11 is an arc shape. The cross-sectional radius of the avoidance groove 11 is larger than the radius of the arc segment 25 on the back side 24, so as to avoid the cutter disc 1 from interfering with the workpiece at the processing position during the rotation processing of the cutter disc 1.

[0034] The cutter disc 1 is annularly provided with a plurality of placement cavities 12, and the blades 2 are arranged in one-to-one correspondence with the placement cavities 12. The blades 2 are fixedly arranged in the corresponding placement cavities 12, and the extension direction of the blades 2 away from the axis of the cutter disc 1 forms an acute angle a with the radial direction of the axis of the cutter disc 1, thereby ensuring that the processing cutting edge 22 transitions from point contact to line contact with the side surface of the rack 7 during processing, making it easier to perform milling processing.

[0035] The placement cavity 12 is provided with a first placement surface 121, a second placement surface and a third placement surface 122. The first placement surface 121, the second placement surface and the third placement surface 122 are all perpendicular to each other, and the third placement surface 122 is perpendicular to the axis of the knife disc 1. Correspondingly, the cross-section of the blade 2 is set to be rectangular, the back side 24 is set to fit the first placement surface 121, and the second placement surface and the third placement surface 122 are both set to fit the surface of the blade 2, so as to achieve the limiting effect of the placement cavity 12 on the blade 2.

[0036] Preferably, a limiting strip 123 is provided on the third placement surface 122, and the limiting strip 123 is arranged parallel to the first placement surface 121, and a limiting groove 124 is formed between the limiting strip 123 and the first placement surface 121, and the groove width of the limiting groove 124 is equal to or slightly larger than the thickness of the blade 2, thereby further improving the stability of the blade 2 on the cutter disc 1, and also facilitating the installation of the blade 2 on the cutter disc 1.

[0037] Generally, a first mounting hole 27 is provided on the blade 2, and a second mounting hole is provided on the first placement surface 121. The first mounting hole 27 is a through hole, and the second mounting hole is a threaded hole. A mounting screw 28 passes through the first mounting hole 27 and is threadedly connected to the second mounting hole, thereby achieving a fixed connection of the blade 2 in the placement cavity 12, and at the same time facilitating disassembly and assembly to replace the blade 2 of different sizes and models based on actual conditions.

[0038] In a specific embodiment, the blade 2 is made of ASP60 material, the hardness is set to HRC64-66, the width is set to 14mm, the height is set to 18mm, the thickness is 4.67mm, the processed cutting edge 22 is an arc shape of R13.875, and the avoidance angle after shaping is 5°. The blade 2 has high strength and is not easy to wear.

[0039] The first mounting hole 27 of 4.5 mm is provided in the middle of the blade 2, and six blades 2 are provided on the cutter disc 1, which are connected to the cutter disc 1 by the mounting screws 28 so that they will not separate, and are easy to install on a CNC machine tool. The blades 2 are easy to install and replace, stable and reliable.

[0040] The utility model arranges the rotary processing cutter disc 1, and performs R angle processing on the side surface of the rack 7 through the arc-shaped processing cutting edge 22. The rack 7 does not need to be rotated for position adjustment, and the R angle surface processed by the processing cutting edge 22 has a good arc effect. The rack 7 only needs to move axially to make the rotating cutter disc 1 move in a straight line along the rack 7. The installation and debugging are less, the relative position is stable during processing, the processing efficiency is high, and the yield rate of the workpiece after processing is high.

[0041] Embodiment 2

[0042] like Figure 6 , Figure 7 As shown, Figure 6 is a three-dimensional structural view of the molding device; Figure 7 The front view of the structure of the molding device. The molding device includes an installation adjustment slide 3, a milling slide 4 and a rack fixing part 5. The milling slide 4 is arranged on one side or both sides of the installation adjustment slide 3. The installation adjustment slide 3 is provided with a fixed seat slide 6. The fixed seat slide 6 can slide freely along the extension direction of the installation adjustment slide 3. The rack fixing part 5 for fixing the rack 7 is fixedly arranged on the fixed seat slide 6. The tooth side fillet molding tool is movably connected to the milling slide 4. The tooth side fillet molding tool is arranged on the side of the rack 7.

[0043] Generally, there are two milling processing slide rails 4, and the two milling processing slide rails 4 are symmetrically arranged on both sides of the installation and adjustment slide rail 3, that is, the two tooth side fillet forming tools can process the rack 7 on both sides of the rack 7 at the same time, thereby avoiding deformation and bending caused by unilateral force on the rack 7, so as to further improve the product quality of the rack 7 workpiece.

[0044] Preferably, the milling slide 4 is provided with a spindle seat 41, a rotating spindle 42 and an adjusting motor 43, the spindle seat 41 slides freely on the milling slide 4 along the extension direction of the milling slide 4, the adjusting motor 43 is connected to the spindle seat 41 through an adjusting shaft 44, and the sliding position of the spindle seat 41 on the milling slide 4 is adjusted by the adjusting motor 43, thereby realizing the advance and retreat stroke adjustment of the cutter disc 1, a connecting hole 13 is provided at the center of the cutter disc 1, the rotating spindle 42 is fixedly arranged in the connecting hole 13, and the CNC machine tool is connected to the cutter disc 1 through the rotating spindle 42, driving the cutter disc 1 to rotate, thereby realizing the milling operation.

[0045] Preferably, the extension directions of the two milling slide rails 4 are consistent, and the extension direction of the installation and adjustment slide rail 3 is perpendicular to the extension direction of the milling slide rail 4, so that the axial position of the rack 7 can be adjusted to achieve linear milling of the cutter disc 1 along the axial direction of the rack 7.

[0046] During specific use, first, the rack 7 is fixed with the teeth facing downward in the rack fixing part 5, the set pressure of the rack fixing part 5 on the rack 7 is 60 kg, the cutter discs 1 on the left and right sides advance 80 mm to reach the milling fillet position, the fixed seat slide 6 advances 180 mm, and then returns to the original position after fine milling, the workpiece is picked up, the milling is completed, and the above actions are repeated for continuous processing.

[0047] The above is only a preferred embodiment of the utility model, which is only illustrative and not restrictive. Those skilled in the art understand that many changes, modifications, and even equivalences can be made within the spirit and scope defined by the claims of the utility model, but they will all fall within the scope of protection of the utility model.

Claims

1. A tooth side fillet forming tool, characterized in that: It includes a cutter disc and blades, the cutter disc is configured as a rotating body structure, a plurality of blades are arranged on the cutter disc in a ring shape with the axis of the cutter disc as the center, a processing groove is provided on the blade, a processing edge is provided on the processing groove, an extension line of the processing edge is an arc line, and an extension radius of the processing edge is set corresponding to the fillet radius of the rack.

2. The tooth side fillet forming tool according to claim 1, characterized in that: The blade is configured as a flat plate-like member, and the blade is provided with a front side and a back side. The processing groove is provided with arc segments on both the front side and the back side, and the radius of the arc segment on the front side is smaller than the radius of the arc segment on the back side. The groove wall of the processing groove is inclinedly transitioned from the front side to the back side to form the processing blade with an acute angle structure on the front side.

3. The tooth side fillet forming tool according to claim 2, characterized in that: The processing groove is also provided with straight line segments extending along a straight line on the front and back sides, the straight line segments are connected to the ends of the corresponding arc segments, and the tangents of the straight line segments and the ends of the corresponding arc segments are provided with avoidance angles in the direction away from the processing groove.

4. The tooth side fillet forming tool according to claim 2, characterized in that: The cutter disc is provided with an avoidance groove corresponding to the processing groove. The avoidance groove is arranged in a circular ring shape, and the cross-sectional shape of the avoidance groove is an arc shape. The cross-sectional radius of the avoidance groove is greater than the radius of the arc segment on the back side.

5. The tooth side fillet forming tool according to claim 2, characterized in that: The cutter disc is annularly provided with a plurality of placement cavities, the blades are arranged in one-to-one correspondence with the placement cavities, the blades are fixedly arranged in the corresponding placement cavities, and the extension direction of the blades away from the axis of the cutter disc forms an acute angle with the radial direction of the axis of the cutter disc.

6. The tooth side fillet forming tool according to claim 5, characterized in that: The placement cavity is provided with a first placement surface, a second placement surface and a third placement surface. The first placement surface, the second placement surface and the third placement surface are all arranged perpendicular to each other, the third placement surface is arranged perpendicular to the axis of the knife disc, the overall shape of the blade is set to be rectangular, the back side is arranged in contact with the first placement surface, and the second placement surface and the third placement surface are both arranged in contact with the surface of the blade.

7. The tooth side fillet forming tool according to claim 6, characterized in that: A limiting strip is arranged on the third placement surface, the limiting strip is arranged parallel to the first placement surface, a limiting groove is formed between the limiting strip and the first placement surface, and a groove width of the limiting groove is equal to or greater than the thickness of the blade.

8. A molding device, characterized in that: It includes an installation and adjustment slide rail, a milling slide rail and a rack fixing part, the milling slide rail is arranged on one side or both sides of the installation and adjustment slide rail, the installation and adjustment slide rail is provided with a fixed seat slide, the fixed seat slide can slide freely along the extension direction of the installation and adjustment slide rail, the rack fixing part for fixing the rack is fixedly arranged on the fixed seat slide, the milling slide rail is movably connected with a tooth side fillet forming tool as described in any one of claims 1 to 7, and the tooth side fillet forming tool is arranged on the side of the rack.

9. The molding device according to claim 8, characterized in that: A spindle seat, a rotating spindle and an adjusting motor are arranged on the milling machining slide rail; the spindle seat slides freely on the milling machining slide rail along the extension direction of the milling machining slide rail; the adjusting motor is connected to the spindle seat via an adjusting shaft; the sliding position of the spindle seat on the milling machining slide rail is adjusted by the adjusting motor; a connecting hole is arranged at the center of the cutter disc; the rotating spindle is fixedly arranged in the connecting hole; and the CNC machine tool is connected to the cutter disc via the rotating spindle.

10. The molding device according to claim 8, characterized in that: The extension direction of the installation and adjustment slide rail and the extension direction of the milling machining slide rail are arranged perpendicularly.

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