CN216706905U - Combined cutting tool for automatic spot welding electrode grinding device - Google Patents
Combined cutting tool for automatic spot welding electrode grinding device Download PDFInfo
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- CN216706905U CN216706905U CN202120456568.XU CN202120456568U CN216706905U CN 216706905 U CN216706905 U CN 216706905U CN 202120456568 U CN202120456568 U CN 202120456568U CN 216706905 U CN216706905 U CN 216706905U
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Abstract
The utility model discloses a combined cutting tool for an automatic spot welding electrode coping device, which comprises a cutter shaft (1), wherein a straight gear (2) is assembled at the shaft end of the cutter shaft (1); one end of the cutter shaft (1) is provided with a flange (7), and the inner side surface of the flange (7) is used as a positioning base surface when the straight gear (2) is assembled with the straight gear; the other end axle center of arbor (1) has opened a screw hole (18), screw hole (18) are used as the bolt pilot hole when arbor (1) carries out axial restraint. The utility model improves the flatness of the working surface of the polished electrode, and has beneficial effects of improving the electrode feed efficiency, ensuring the quality of welding spots and the like.
Description
Technical Field
The utility model relates to an electrode coping cutting tool used in resistance spot welding electrode coping, in particular to a combined cutting tool which is arranged in a special automatic electrode coping device and is used for coping the working end part of a resistance spot welding electrode.
Background
The electrode is arranged at the end part of the electrode holding rod and is commonly called an electrode cap. In spot welding, the flat surface portions of the electrode ends on both sides serve as working surfaces, and the workpiece to be welded is held by the flat surface portions, and pressing to the part to be welded and introduction of welding current to the workpiece to be welded are specifically performed. After a number of points are welded on the electrode, the state of the working plane at the end part of the electrode is changed, and the electrode needs to be ground in time, and an automatic grinding device of the electrode and a cutting tool in the automatic grinding device are one of methods for grinding the profile of the working end surface of the electrode.
In the process of resistance spot welding technology, the automatic electrode grinding device utilizes a cutting tool arranged in the automatic electrode grinding device to grind the profile of the working end face of the electrode, and the automatic electrode grinding device in the prior art mainly has the following defects due to the structural design type and the working principle of the cutting tool:
1. synchronously polishing the end surfaces to be repaired of the electrodes on the two sides by using an integral cutting tool with cutting edges on the two sides, wherein the cutting edges on the two sides are in a mirror image relationship; the single-blade structure is basically used by the limitation of the working principle.
2. In the electrode grinding process, the electrode pressure always vertically acts on the cutting edges of the cutting tools on two sides, and the essence of the electrode grinding mode is scraping grinding; the working principle of the cutting tool determines that the cutting force during electrode grinding is cooperatively established by the electrode pressure and the rotating torque of the cutting edge; in the electrode grinding process, one side cutting edge grinds the electrode end surface to be repaired in a positive edge scraping mode, and the other side cutting edge grinds the electrode end surface to be repaired in a reverse edge scraping mode; the essential characteristic of this kind of scraping coping has decided that the cutting tool blade not only wearing and tearing speed is extremely fast, and the wearing and tearing speed of both sides blade also has very big difference, and under same coping condition, the difference between the coping quality of both sides electrode work tip and the coping volume at every turn can increase gradually along with blade number of work improves.
3. Because the spot welding robot has repeated positioning precision error, the designed working length of the cutting edge for grinding the electrode working plane part must meet the relationship of more than or equal to the sum of the working radius of the electrode to be cut and ground and the repeated positioning precision of the electrode, so that the effective cutting and grinding of the electrode to-be-ground plane part can be ensured within the range of the repeated positioning precision; from the aspect of probability statistics, about 50% of cutting and grinding are carried out under the condition that a local cutting edge exceeds the radius of an electrode, the local cutting edge exceeding the radius of the electrode works under the condition of reverse-edge hard extrusion, while the cutting edge at the rotary center part of each scraping and rotating of a cutting tool is ground on the working surface of the electrode under the conditions of rotary rolling and rotary tearing, so that the cutting edge in the area is easily rapidly worn or broken.
4. Due to the restrictions of the design conditions and the working conditions of the cutting edge described in item 2, the use of the multi-edge cutting edge type cutting tool is restricted for the purpose of reducing the working load of the cutting edge, and the possibility of the automatic chip breaking capability of the cutting edge of the cutting tool is eliminated, so-called chips are stacked chips which are continuously extruded, extruded stacked chips which are not timely discharged or the scraping work which hinders the continuous stability of the cutting edge is hindered, or the accelerated wear or chipping phenomenon of the cutting edge of the cutting tool is easily caused.
5. The cutting tool is fixedly arranged on a tool rest in the automatic electrode coping device and synchronously rotates along with the tool rest; the rotary axis of the cutting tool and the axis established by the central connecting line of the working surfaces of the two electrodes are always coaxial, and the working surface after electrode grinding is a spherical surface which is actually corresponding to the curvature radius of the cutting edge of the cutting tool and is determined by the cutting edge cutting allowance and has a spiral lift angle.
6. Because the rotary axis of the cutting edge is coaxial with the electrode axis, the difference between the rotary linear velocity and the rotary linear acceleration of the center of the cutting edge and the outer edge of the cutting edge is very large in the cutting process, namely the working load or the bending moment born by each part along the whole length of the cutting edge is very different, the outer edge cutting edge becomes a dangerous part due to the maximum rotary acceleration, and the cutting edge beyond the rotary axis part also becomes another dangerous part in the cutting edge due to the working condition of hard extrusion of the counter blade; meanwhile, the difference of the cutting linear speed of each part of the whole length of the cutting edge is very large, so that the grinding quality of each part of the end surface of the electrode after grinding is different.
Because the cutting edge of the cutting tool works under a series of working conditions and adverse working conditions, even if the cutting tool is made of relatively expensive materials, the current situation that the cutting tool is a frequent vulnerable part in the automatic electrode coping device is difficult to get rid of.
SUMMERY OF THE UTILITY MODEL
The utility model overcomes the defects of the prior art and provides a combined cutting tool for an automatic spot welding electrode coping device.
The technical scheme adopted by the utility model is as follows:
1. the multi-edge combined cutting tool with the front rake is introduced into the automatic electrode grinding device by changing the structural style of the cutting tool and the cutting working principle of the cutting tool, and the essential scraping and grinding characteristics of the electrode in the prior art are changed into cutting and grinding.
2. The cutting tool carries out cutting and grinding on the end part to be repaired of the electrode in a revolution and rotation mode without the help of electrode pressure, and the phenomenon of unfavorable scraping and grinding in the prior art is avoided.
3. Unnecessary cutting coping amount in the prior art is extremely compressed by a micro-cutting amount positioning and moving cutting mode, and the cutting load in the smaller coping amount is shared by the multi-edge cutting edge of the combined cutting tool, so that the cutting stress of the cutting edge of the cutting tool is further reduced.
4. And correcting and compensating negative influences on the contact state of the working surface of the electrode and the surface of the workpiece, such as the bending deformation of the welding tongs arm and the distance between the electrodes at two sides during grinding in a grinding angle adjusting mode. Under the common support of the technical measures, the average service life of the cutting tool can be prolonged by more than ten times, and the utilization rate of electrode materials can be increased by more than 50%.
The concrete improvement is as follows:
a combined cutting tool for an automatic spot welding electrode coping device comprises a cutter shaft (1), wherein a straight gear (2) is assembled at the shaft end of the cutter shaft (1); the innovation of the utility model is that:
one end of the cutter shaft (1) is provided with a flange (7), and the inner side surface of the flange (7) is used as a positioning base surface when the straight gear (2) is assembled with the straight gear; a threaded hole (18) is formed in the axis of the other end of the cutter shaft (1), and the threaded hole (18) is used as a bolt assembling hole when the cutter shaft (1) is axially constrained;
a first circular sinking platform (6) is arranged at the shaft end of the straight gear (2) along the axis, and the bottom surface of the first circular sinking platform (6) is used as a positioning base surface after the cutter shaft (1) is inserted into the shaft hole of the straight gear (2); a centrosymmetric second circular sinking platform (8) is arranged on the disc surface on the other side of the straight gear (2), and a first cutting tool (4) is fixedly arranged in the second circular sinking platform (8) by using two fixing pins (3) to form an assembly;
a second cutting tool (5) or (17) is coaxially embedded in a third circular sinking platform (10) which is centrosymmetric on the first cutting tool (4); utilizing a key (11) to carry out radial constraint fixation between the straight gear (2) and the second cutting tool (5) or (17) and the cutter shaft (1);
the first cutting tool (4) is in the shape of a thin-walled disc; a plurality of same cutting edges (9) with radial track lines are uniformly distributed on the annular surface of the convex ring at the outer side of the second circular sinking platform (8) relative to the circle center; a plurality of cutting edges with the same geometric dimension are respectively arranged on the axial outer side surface of the second cutting tool (5) or (17) along the axial direction;
the second cutting tool (5) or (17) comprises an arc-surface cutting tool (5) and a truncated cone-shaped cutting tool (17).
When the first cutting tool (4) rotates to grind the electrode, the rotation plane of the cutting edge is always attached to the working end plane part (12) of the electrode to be cut and ground, and only the grinding work of the electrode working end plane part (12) is carried out.
When the cambered surface cutting tool (5) rotates to grind the electrode to be cut and ground, the revolving outline trajectory of the cutting edge is attached to a cambered surface curve (15) on the side surface of the cambered surface electrode (13), and only the grinding of the side surface of the working end of the cambered surface electrode (13) is carried out.
Furthermore, the contour trajectory line is formed by combining a concave arc line segment and a concave straight line segment from the small end to the large end of the cambered surface cutting tool (5); the radius of the arc line segment is the same as the arc surface radius of the arc surface curve (15) part in the electrode to be polished.
When the truncated cone-shaped cutting tool (17) rotates to grind the electrode to be cut and ground, the outline trajectory of the rotation of the cutting edge is attached to the conical surface (16) of the side surface of the truncated cone-shaped electrode (14), and only the grinding of the side surface of the working end of the truncated cone-shaped electrode (14) is carried out.
The cone angle of the truncated cone-shaped cutting tool (17) is the same as the cone angle of the side surface conical surface (16) of the working end of the truncated cone-shaped electrode (14) to be polished.
The first blade (4) includes a plurality of cutting edges (9) having the same geometry, and the cutting edges (9) have the following relationships with respect to the spot welding material, among a rake angle α, an edge thickness f, an edge thickness back angle θ, a rear edge width e, a disk diameter D1, and the number of cutting edges n 1:
| spot welding material | Front angle alpha | Thickness of bladef | Edge thickness back angle theta | Width behind edge e | Disc diameter D1 | Number of cutting edges |
| Steel plate | ||||||
| 3～8° | f≥0.2 |
15～25° | ≥0.8mm | ≥30 | ≥32 | |
| Aluminum plates | 2.5～5° | f≥0.3 |
15～25° | ≥0.8mm | ≥35 | ≥34 |
Furthermore, the cambered surface cutting tool (5) comprises a plurality of cutting edges with the same geometric shape; the relationship between the diameter D5 of the large end of the blade of the cambered surface blade (5), the diameter D3 of the small end of the blade, the number n2 of the cutting edges, the cutting edge helix angle omega 2 and the electrode diameter R of the cambered surface electrode (13) to be cut and polished is as follows:
| electrode diameter R | Cutting tool large end diameter D5 | Diameter D3 of small end of cutting tool | Number of cutting edges n2 | Helix angle ω |
| 13mm | ≥35mm | ≥9mm | 8-14 | 0～3° |
| 16mm | ≥43mm | ≥11mm | 14 to 20 | 0～4° |
| 22mm | ≥52mm | ≥12mm | 18 to 25 | 0～5° |
Furthermore, the truncated cone-shaped cutting tool (17) comprises a plurality of cutting edges with the same geometric shape; the relationship between the diameter D5 of the large end of the cutting tool, the diameter D3 of the small end of the cutting tool, the number n3 of the cutting edges, the back inclination angle epsilon of the cutting edges and the diameter R of the electrode (14) to be ground is as follows:
| electrode diameter R | Cutting tool large end diameter D5 | Diameter D3 of small end of cutting tool | Number of cutting edges n3 | Back inclination angle epsilon |
| 13mm | ≥35mm | ≥9mm | 8 to 14 | 10～13° |
| 16mm | ≥43mm | ≥11mm | 14 to 18 | 11～14° |
| 22mm | ≥52mm | ≥12mm | 18 to 23 | 12～15° |
Moreover, the structural parameters of the first cutting tool (4), the cambered surface cutting tool (5) and the truncated cone-shaped cutting tool (17) are selected according to the material to be subjected to spot welding:
when the first cutting tool (4), the cambered surface cutting tool (5) and the truncated cone-shaped cutting tool (17) are used for electrode grinding of a spot welding steel plate:
the geometrical parameters of the cutting edge comprise a front angle alpha, a back angle delta, an edge thickness f, an edge back width e and an edge thickness back angle theta, and the recommended values of the relation among the front angle alpha, the back angle delta, the edge thickness f, the edge back width e and the edge thickness back angle theta are as follows:
| front angle alpha | Back angle delta | Edge thickness f | Width behind edge e | Edge thickness |
| 3～8° | 8～12° | ≥0.2mm | ≥0.8 |
15～25° |
A second section of thick bamboo is used for welding aluminium or aluminium alloy's electrode coping when first cutting tool (4), cambered surface cutting tool (5) and round platform shape cutting tool (17) are used for:
the geometrical parameters of the cutting edge comprise a front angle alpha, a back angle delta, an edge thickness f, an edge back width e and an edge thickness back angle theta, and the recommended values of the relation among the front angle alpha, the back angle delta, the edge thickness f, the edge back width e and the edge thickness back angle theta are as follows:
| front angle alpha | Back angle delta | Edge thickness f | Width behind edge e | Edge thickness back angle theta |
| 2.5～5° | 8～12° | ≥0.3mm | ≥0.8 |
15～25° |
The utility model has the technical effects that:
1. in the utility model, because the structure type of the cutting tool and the cutting and grinding principle thereof are fundamentally changed, and each cutting tool in the combined cutting tool has the characteristic of a multi-edge cutting edge, the total cutting and grinding amount during electrode grinding is distributed by the multi-edge cutting edges, and the service life of the cutting tool can be prolonged by multiple times.
2. According to the utility model, the cutting edge is allowed to be designed to be sharper, necessary conditions are created for the snack knife amount positioning, moving, cutting and grinding electrode, the cutting stress level in the cutting and grinding process of the cutting tool is further reduced, the service life of the cutting tool is prolonged, the positioning, moving and cutting in the electrode grinding process are easy to realize, the electrode is beneficial to inhibiting the excessive cutting of the electrode, and the electrode consumption is reduced.
3. The utility model improves the flatness of the working surface of the polished electrode, and has beneficial effects of improving the electrode feed efficiency, ensuring the quality of welding spots and the like.
Drawings
FIG. 1-1 is an axial cross-sectional view of the first blade in combination with a cambered surface blade of the present invention;
FIG. 1-2 is a top view of FIG. 1-1;
FIG. 2-1 is an axial cross-sectional view of the first blade in combination with a frustoconical blade of the present invention;
FIG. 2-2 is a top view of FIG. 2-1;
FIG. 3-1 is an axial cross-sectional view of a first tool of the present invention;
FIG. 3-2 is a top view of FIG. 3-1;
FIG. 4-1 is an axial cross-sectional view of the cambered surface blade of the present invention;
FIG. 4-2 is a top view of FIG. 4-1;
FIG. 5-1 is an axial cross-sectional view of a truncated cone shaped cutting tool of the present invention;
FIG. 5-2 is a top view of FIG. 5-1;
FIG. 6 is an enlarged view of the cutting edge I of each blade;
FIG. 7-1 is a block diagram of a cambered surface electrode;
fig. 7-2 is a structural view of a truncated cone-shaped electrode.
In the figure: 1-cutter shaft, 2-straight gear, 3-fixed pin, 4-first cutting tool, 5-cambered surface cutting tool, 6-first circular sinking platform, 7-flange, 8-second circular sinking platform, 9-cutting edge, 10-third circular sinking platform, 11-key, 12-working end plane part, 13-cambered surface electrode, 14-circular platform electrode, 15-outward convex circular arc surface + straight line part, 16-electrode working end conical surface part and 17-circular platform cutting tool.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to the drawings and specific embodiments, which are only illustrative of the present invention and are not intended to limit the present invention.
A combined cutting tool for an automatic spot welding electrode coping device comprises a cutter shaft 1, wherein a straight gear 2 is assembled at the shaft end of the cutter shaft 1; the innovation of the utility model is that: one end of the cutter shaft 1 is provided with a flange 7, and the inner side surface of the flange 7 is used as a positioning base surface when the straight gear 2 is assembled with the straight gear; the other end of the cutter shaft 1 is provided with a threaded hole 18, and the threaded hole 18 is used as a bolt assembling hole ([ sic ]) when the cutter shaft 1 is axially restrained.
As shown in fig. 1-1, fig. 1-2, fig. 2-1 and fig. 2-2, the shaft end of the cutter shaft 1 is inserted from the side of the central through hole of a first circular sinking platform 6 at the shaft end of a spur gear 2, and a flange 7 on the cutter shaft 1 is embedded into the first circular sinking platform 6; a second circular sinking platform 8 is also arranged on the disc surface on the other side of the straight gear 2, and a first cutting tool 4 is fixedly arranged in the circular sinking platform by two fixing pins 3 to form a combined piece; the first cutting tool 4 is a thin-wall disc with a third circular sinking platform 10 on one side surface, and a radioactive cutting edge 9 of the first cutting tool is arranged on a convex ring surface at the outer side of the circular sinking platform; a second cutting tool 5 or 17 is coaxially embedded in the circular sinking platform of the first cutting tool, and radial constraint and fixation among the straight gear 2, the second cutting tool 5 or 17 and the cutter shaft 1 is realized by using a key 11.
As shown in fig. 3-1 and 3-2, the first blade 4 has the appearance of a thin-walled disc; a third circular sinking platform 10 is arranged on the disk surface on one side of the third circular sinking platform in a central symmetry manner, and a plurality of same radial cutting edges are uniformly distributed on a convex ring surface on the outer side of the third circular sinking platform 10 relative to the circle center; the first cutting tool is equivalent to an annular end mill; when the first cutting tool 4 rotates to grind the electrode, the cutting edge revolving plane 9 is always attached to the electrode working end plane part 12 (as shown in fig. 7-1 and 7-2) of the working end of the electrode to be cut and ground, and only carries out grinding on the electrode working end plane part 12.
In the utility model, the geometric shape of the cutting edge of the first cutting tool 4 can be described by parameters of a front angle alpha, a cutting edge thickness f, a cutting edge thickness back angle theta, a cutting edge back width e and the like of the cutting edge of the cutting tool together; wherein, the larger the front angle alpha is, the sharper the cutting edge is, but the load bearing capacity is correspondingly reduced; the blade thickness f, the back angle theta and the back edge width e represent the supporting capacity of the blade back part of the blade to the blade, and the blade thickness and the back edge width e are larger and the back angle theta is smaller, so that the supporting capacity of the blade back part of the blade to the blade is reflected to be stronger. The meaning of the parameters is the same as that of each parameter in the milling cutter standard; the relationship between the parameters of the rake angle α, the edge thickness f, the edge thickness back angle θ, the edge back width e of the first cutting edge, and the like, and the disc diameter D1 and the number of cutting edges n1 of the first cutting edge 4 preferably conforms to the recommended values in table 1.
Table 1: relationship between parameters of first cutting tool cutting edge geometry
| Spot welding material | Front angle alpha | Edge thickness f | Edge thickness back angle theta | Width behind edge e | Disc diameter D1 | Number of cutting edges |
| Steel plate | ||||||
| 3～8° | f≥0.2 |
15～25° | ≥0.8mm | ≥30 | ≥32 | |
| Aluminum plates | 2.5～5° | f≥0.3 |
15～25° | ≥0.8mm | ≥35 | ≥34 |
As shown in fig. 3-1 and 3-2, D2 is the inner diameter of the cutting edge circle of the first cutting tool 4, i.e. the diameter of the third circular sinking platform 10, and D1 is the outer diameter of the cutting edge circle; the difference value of D1-D2 is the ring width of the cutting edge ring surface, namely the cutting edge width; when the combined cutting tool is assembled, the diameter of the large end of the second cutting tool 5 or 17 is embedded in the sinking platform of the first cutting tool 4, and the value range of the circular inner diameter D2 of the first cutting tool 4 can be selected according to the diameter D5+0.10 mm of the large end of the second cutting tool 5 or 17; in order to ensure the strength of the cutting edge base part of the cutting tool, the total thickness h of the first cutting tool 4 is selected according to the size of ≧ 3 mm. From the viewpoint of facilitating chip removal, the cutting edges of the disc-shaped first cutting tool 4 are all provided with a back inclination angle epsilon, and the angle of the back inclination angle epsilon is preferably between 10 and 15 degrees.
In the present invention, the working end face of the electrode to be processed may be a cambered surface electrode 13 or a truncated cone-shaped electrode 14, that is, the trajectory line of the side face of the working end of the electrode may be an outer convex circular arc surface + a straight line portion at the reference numeral 15 or a truncated cone-shaped surface at the reference numeral 16, so that the second blade suitable for the electrode shown in fig. 7-1 is the cambered surface blade 5 shown in fig. 4-1 and 4-2, and the second blade suitable for the electrode shown in fig. 7-2 is the truncated cone-shaped blade 17 shown in fig. 5-1 and 5-2.
If the second cutting tool is the cambered surface cutting tool 5, the contour trajectory of the cutting edge of the second cutting tool is divided into a combination of an inward concave arc line segment and a straight line segment, as shown in fig. 4-1 and 4-2; the radius of an arc line segment in the outline trajectory line of the arc surface cutting tool 5 is equal to the radius r of the arc surface of the outer convex arc surface of the working end side surface of the arc surface electrode 13 to be cut and polished, and the linear surface of the arc surface cutting tool is designed according to an abduction tangent line when the central angle corresponding to the arc surface curve is 50 degrees +/-10 degrees, as shown in the lower right corner of fig. 7-1. The contour trajectory line of the cambered surface cutting tool 5 is matched with a cambered surface curve 15 of the side surface of the working end of the cambered surface electrode 13 to be cut and polished, and only the polishing of the positions of the outer convex cambered surface and the straight line part 15 of the side surface of the electrode working end shown in figure 7-1 is undertaken. The radius of the arc line section of the arc surface cutting tool 5 is the same as the radius of the arc surface at the position in the electrode to be polished.
The cambered surface cutter 5 comprises a plurality of cutting edges with the same geometric shape, and the structural dimensions of the cambered surface cutter comprise a cutter large-end diameter D5, a cutter small-end diameter D3 and the number n2 of the cutting edges. Because the cutting edge of the cambered surface cutting tool 5 has smaller geometric dimension and is of a multi-edge compound curved surface structure type, the spiral angle omega of the cutting edge of the cambered surface cutting tool 5 can be limited within the range of less than or equal to 5 degrees from the viewpoint of facilitating the manufacturing of the cutting tool; the structural size, the number of the cutting edges and the relation between the cutting edge helix angle omega and the electrode diameter R to be cut and polished of the cambered surface cutting tool 5 preferably accord with the recommended values in the table 2.
Table 2: the relationship between the structural size, the cutting edge number and the helix angle of the cambered surface second cutting tool 5
| Electrode diameter R | Cutting tool large end diameter D5 | Diameter D3 of small end of cutting tool | Number of cutting edges n2 | Helix angle ω |
| 13mm | ≥35mm | ≥ |
8 to 14 | 0～3° |
| 16mm | ≥43mm | ≥ |
14 to 20 | 0～4° |
| 22mm | ≥52mm | ≥ |
18 to 25 | 0～5° |
If the second cutting tool is a truncated cone-shaped cutting tool 17, the taper angle of the truncated cone-shaped cutting tool 17 is matched with the taper angle of the side surface of the working end of the truncated cone-shaped electrode 11 to be cut and polished, and only polishing is carried out at the position of the tapered surface 16 of the side surface of the working end of the truncated cone-shaped electrode as shown in the figure 7-2.
As shown in fig. 5-1 and 5-2, the truncated cone-shaped cutting tool 17 comprises a plurality of cutting edges with the same geometric shape; the structural size of the truncated cone-shaped cutting tool 17 comprises a large end diameter D5 of the cutting tool, a small end diameter D3 of the cutting tool and the number n3 of cutting edges; because the truncated cone-shaped cutting tool 17 has better processing manufacturability than the cambered surface cutting tool 5, the cutting edges of the truncated cone-shaped cutting tool 17 are all provided with a back inclination angle epsilon, and the angle of the back inclination angle epsilon is preferably 10-15 degrees. The relationship between the structural size, the number of the cutting edges and the back inclination angle epsilon of the cutting edges of the truncated cone-shaped cutting tool 17 and the diameter R of the electrode to be cut and polished best conforms to the recommended values in the table 3.
Table 3: the relationship between the structural size of the second cutting tool 17 in the shape of a truncated cone, the number of cutting edges and the back rake angle
| Electrode diameter R | Cutting tool large end diameter D5 | Diameter D3 of small end of cutting tool | Number of cutting edges n3 | Back inclination angle epsilon |
| 13mm | ≥35mm | ≥ |
8 to 14 | 10～13° |
| 16mm | ≥43mm | ≥ |
14 to 18 | 11～14° |
| 22mm | ≥52mm | ≥ |
18 to 23 | 12～15° |
The geometry of the first 4, cambered 5 and truncated cone 17 edges is described collectively by parameters such as the rake angle α, the back angle δ, the edge thickness b and the edge thickness back angle θ of the edge of the tool. The larger the cutting edge front angle alpha is, the sharper the cutting edge is, but the load bearing capacity is also correspondingly reduced; parameters such as a back angle delta, a blade thickness b, a blade thickness back angle theta and the like are parameters for describing the supporting capacity of the back of the cutting edge to the cutting edge together, and the larger the blade thickness b of the cutting edge is, the smaller the back angle delta and the blade thickness back angle theta are, the stronger the supporting capacity of the back of the cutting edge to the cutting edge is when the back of the cutting edge bears the load; the relationship between the geometrical parameters of edge rake angle α, back angle δ, edge thickness b and edge thickness back angle θ preferably conforms to the recommended values in tables 4 and 5.
The recommended values of the structural parameters of the first cutting tool (4), the cambered surface cutting tool (5) and the circular truncated cone-shaped cutting tool (17) during spot welding of different materials are as follows:
when the first cutting tool (4), the cambered surface cutting tool (5) and the circular truncated cone-shaped cutting tool (17) are used for electrode grinding of spot welding steel plates, geometric parameters of the cutting edge comprise a front angle alpha, a back angle delta, an edge thickness f, an edge back width e and an edge thickness back angle theta, and recommended values of relations among the front angle alpha, the back angle delta, the edge thickness f, the edge back width e and the edge thickness back angle theta are as follows:
table 4: structural parameters of the first cutting tool (4), the cambered surface cutting tool (5) and the truncated cone-shaped cutting tool (17)
| Front angle alpha | Back angle delta | Edge thickness f | Width behind edge e | Edge thickness back |
| 3～8° | 8～12° | ≥0.2mm | ≥0.8 |
15～25° |
When the first cutting tool (4), the cambered surface cutting tool (5) and the circular truncated cone-shaped cutting tool (17) are used for electrode grinding of spot welding aluminum or aluminum alloy, the geometric parameters of the cutting edge comprise a front angle alpha, a back angle delta, a blade thickness f, a blade back width e and a blade thickness back angle theta, and the recommended values of the relation among the front angle alpha, the back angle delta, the blade thickness f, the blade back width e and the blade thickness back angle theta are as follows:
table 5: structural parameters of the first cutting tool (4), the cambered surface cutting tool (5) and the truncated cone-shaped cutting tool (17)
| Front angle alpha | Back angle delta | Edge thickness f | Width behind edge e | Edge thickness back angle theta |
| 2.5～5° | 8～12° | ≥0.3mm | ≥0.8 |
15～25° |
As shown in the figures 3-1, 4-1 and 5-1, the diameters of the shaft holes of the first cutting tool 4, the second cutting tool 5 or 17 are all represented by D4, are all the same as the diameter of the shaft hole on the straight gear 2, and form a clearance fit relation with the outer diameter of the cutter shaft 1, and the fit clearance of the shaft holes is selected according to (0.01-0.02 mm). L is the axial total length of the arc cutting tool 5 or the truncated cone-shaped cutting tool 17, and the value range of L is selected according to the radius (the radius is D/2 in figure 7-1 or 7-2) minus (0.5-1 mm) of the working end 12 of the cambered electrode 13 to be polished.
R is the arc radius of the arc part in the arc cutting tool 5, and the value of R is equal to the arc radius R of the arc part 9 on the side surface of the working end of the arc electrode 13 to be polished.
In the utility model, no matter the disc-shaped cutting tool of the first cutting tool 4 or the cambered surface cutting tool 5 or the circular truncated cone-shaped cutting tool 17 of the second cutting tool is a multi-cutting-edge cutting tool, compared with the integrated single-cutting-edge cutting tool which is frequently recommended to be used in the automatic electrode coping device in the prior art, the multi-cutting-edge cutting tool of the utility model can be used after the first cutting tool 4 and the second cutting tool 5 or 17 are combined according to the relation of figures 1-1 or figures 1-2, and can obtain the expected coping effect on the working end face of the electrode when the combined cutting tool grinds the surface of the electrode to be repaired in a revolution and rotation mode.
The multi-edge cutting tool is compared with the cutting tool which is frequently recommended to be used in the prior art and only has one cutting edge; the number of the cutting edges of the multi-edge cutting tool provided by the utility model as shown in figures 3-5 is in direct proportion to the diameter of the disc and in inverse proportion to the tooth pitch of the cutting edges of the first cutting tool 4; for the circular arc-shaped cutting tool 5 or the circular truncated cone-shaped cutting tool 17, when the grinding object is a universal phi 16 electrode, the minimum cutting edge number is 14. The geometrical characteristics of the cutting edge of the second cutting tool 5 or 17 are all composite curved surfaces, namely the composite curved surface of the cutting edge of the cutting tool means that the geometrical shape of the detailed part of the cutting edge of the cutting tool needs to be described by multiple sizes and multiple angles listed in tables 2-5. A disc-shaped cutting tool as a first cutting tool 4 only undertakes cutting and grinding of the plane part of the electrode working end 12 in the electrode grinding process; the arc cutting tool 5 or the truncated cone cutting tool 17 as the second cutting tool only undertakes cutting and grinding at the position of the number 15 or 16 of the side surface of the working end of the electrode in the electrode grinding process, and the radius of the grinded arc, the cone angle and the like are determined by the geometric shape and the parameter size of the side surface of the working end of the electrode to be ground 13 or 14.
After the multi-edge type cutting tool as shown in figures 3-5 is adopted and combined into a combined cutting tool according to figures 1-1 or 1-2, the following advantages can be created for the automatic electrode grinding device: firstly, the cutting load borne by a single cutting edge in the prior art is shared by multiple cutting edges, so that the service life of the cutting tool is prolonged; and secondly, because the cutting load of the cutting edge of the cutting tool in the electrode cutting and grinding process is greatly reduced, the cutting edge of the cutting tool can be made sharper, necessary conditions are created for grinding the electrode under the condition of slight cutting allowance of the cutting edge of the cutting tool, the cutting stress of the cutting edge of the cutting tool is further reduced, and the service life of the cutting tool is prolonged.
While the present invention has been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are illustrative only and not restrictive, and various modifications which do not depart from the spirit of the present invention and which are intended to be covered by the claims of the present invention may be made by those skilled in the art.
Claims (10)
1. A combined cutting tool for an automatic spot welding electrode coping device comprises a cutter shaft (1), wherein a straight gear (2) is assembled at the shaft end of the cutter shaft (1); the method is characterized in that:
one end of the cutter shaft (1) is provided with a flange (7), and the inner side surface of the flange (7) is used as a positioning base surface when the straight gear (2) is assembled with the straight gear; a threaded hole (18) is formed in the axis of the other end of the cutter shaft (1), and the threaded hole (18) is used as a bolt assembling hole when the cutter shaft (1) is axially constrained;
a first circular sinking platform (6) is arranged at the shaft end of the straight gear (2) along the axis, and the bottom surface of the first circular sinking platform (6) is used as a positioning base surface after the cutter shaft (1) is inserted into the shaft hole of the straight gear (2); a second circular sinking platform (8) with a central symmetry is arranged on the disc surface on the other side of the straight gear (2), and a first cutting tool (4) is fixedly arranged in the second circular sinking platform (8) by two fixing pins (3) to form an assembly;
a second cutting tool is coaxially embedded in a third circular sinking platform (10) which is centrosymmetric on the first cutting tool (4); radial constraint and fixation are carried out between the straight gear (2) and the second cutting tool as well as the cutter shaft (1) by using a key (11);
the first cutting tool (4) is in the shape of a thin-wall disc; a plurality of same cutting edges (9) with radial track lines are uniformly distributed on the annular surface of the convex ring at the outer side of the second circular sinking platform (8) relative to the circle center; a plurality of cutting edges with the same geometric dimension are arranged on the axial outer side surface of the second cutting tool along the axial direction;
the second cutting tool comprises a cambered surface cutting tool (5) and a truncated cone-shaped cutting tool (17).
2. The combined cutting tool for the automatic sharpening machine of the spot welding electrode according to claim 1, characterized in that:
when the first cutting tool (4) rotates to grind the electrode to be cut, the rotating plane of the cutting edge is always attached to the working end plane part (12) of the electrode to be cut and ground, and only the grinding work of the electrode working end plane part (12) is undertaken.
3. The combined cutting tool for the automatic sharpening machine of the spot welding electrode according to claim 1 or 2, characterized in that:
when the cambered surface cutting tool (5) rotates to grind the electrode to be cut and ground, the revolving outline trajectory of the cutting edge is attached to the cambered surface curve (15) on the side surface of the cambered surface electrode (13), and only the grinding of the side surface of the working end of the cambered surface electrode (13) is undertaken.
4. The combined cutting tool for the automatic sharpening machine of the spot welding electrode according to claim 3, characterized in that:
the contour trajectory line is formed by combining a concave arc line segment and a concave straight line segment from the small end to the large end of the cambered surface cutting tool (5); the radius of the arc line segment is the same as the arc surface radius of the arc surface curve (15) part in the electrode to be polished.
5. The combined cutting tool for the automatic spot welding electrode grinding machine according to claim 1 or 2, characterized in that:
when the truncated cone-shaped cutting tool (17) rotates to grind the electrode to be cut and ground, the revolving outline trajectory of the cutting edge is attached to the conical surface (16) on the side surface of the truncated cone-shaped electrode (14), and only the grinding of the side surface of the working end of the truncated cone-shaped electrode (14) is undertaken.
6. The combined cutting tool for the automatic sharpening machine of the spot welding electrode according to claim 5, wherein:
the cone angle of the truncated cone-shaped cutting tool (17) is the same as that of the part of the working end side surface conical surface (16) of the round truncated cone-shaped electrode (14) to be polished.
7. The combined cutting tool for the automatic sharpening machine of the spot welding electrode according to claim 1, 2, 4 or 6, characterized in that: the first cutting tool (4) comprises a plurality of cutting edges (9) with the same geometric shape, and the front angle alpha, the edge thickness f, the edge thickness back angle theta, the edge back width e, the disk diameter D1 and the cutting edge number n1 of the cutting edges (9) have the following relation with the spot welding material.
8. The combined cutting tool for the automatic sharpening machine of the spot welding electrode according to claim 4, wherein: the cambered surface cutting tool (5) comprises a plurality of cutting edges with the same geometric shape; the relation between the diameter D5 of the large end of the blade of the cambered surface blade (5), the diameter D3 of the small end of the blade, the number n2 of the cutting edges, the spiral angle omega of the cutting edges and the diameter R of the electrode of the cambered surface electrode (13) to be cut and polished is as follows.
9. The combined cutting tool for the automatic sharpening machine of the spot welding electrode according to claim 6, wherein: the truncated cone-shaped cutting tool (17) comprises a plurality of cutting edges with the same geometric shape; the relation between the diameter D5 of the large end of the cutting tool, the diameter D3 of the small end of the cutting tool, the number n3 of the cutting edges, the back inclination angle epsilon of the cutting edges and the diameter R of the electrode (14) to be ground is as follows.
10. The combined cutting tool for the automatic sharpening machine of the spot welding electrode according to claim 8 or 9, wherein: the structural parameters of the first cutting tool (4), the cambered surface cutting tool (5) and the truncated cone-shaped cutting tool (17) are selected according to the material of the spot welding:
when the first cutting tool (4), the cambered surface cutting tool (5) and the truncated cone-shaped cutting tool (17) are used for electrode grinding of a spot welding steel plate:
the geometrical parameters of the cutting edge comprise a front angle alpha, a back angle delta, an edge thickness f, an edge back width e and an edge thickness back angle theta, and the recommended values of the relation among the front angle alpha, the back angle delta, the edge thickness f, the edge back width e and the edge thickness back angle theta are as follows:
Secondly, when the first cutting tool (4), the cambered surface cutting tool (5) and the circular truncated cone-shaped cutting tool (17) are used for polishing the electrode of the spot welding aluminum or the aluminum alloy:
the geometrical parameters of the cutting edge comprise a front angle alpha, a back angle delta, an edge thickness f, an edge back width e and an edge thickness back angle theta, and the recommended values of the relation among the front angle alpha, the back angle delta, the edge thickness f, the edge back width e and the edge thickness back angle theta are as follows.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120456568.XU CN216706905U (en) | 2021-03-03 | 2021-03-03 | Combined cutting tool for automatic spot welding electrode grinding device |
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| CN202120456568.XU CN216706905U (en) | 2021-03-03 | 2021-03-03 | Combined cutting tool for automatic spot welding electrode grinding device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113210826B (en) * | 2021-03-29 | 2024-04-26 | 扬帆研华(天津)科技发展有限公司 | Automatic grinding device for symmetrical spot welding electrode without ball cage |
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2021
- 2021-03-03 CN CN202120456568.XU patent/CN216706905U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113210826B (en) * | 2021-03-29 | 2024-04-26 | 扬帆研华(天津)科技发展有限公司 | Automatic grinding device for symmetrical spot welding electrode without ball cage |
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