A hole chamfering tool for mold

Abstract

The present invention provides a hole chamfering tool for a mold, and belongs to the field of mold processing technology. It solves the problem of low chamfering precision and poor quality of the hole of the existing mold. The hole chamfering tool of the mold includes a straight-cylindrical knife barrel and a knife rod that is slidably inserted into the knife barrel and can rotate. One end of the knife barrel is an operating end, and the other end is a hole opening end. One end of the knife rod extends out of the operating end of the knife barrel and is fixed with a handle. The other end of the knife rod can extend out of the hole opening end of the knife barrel and is fixed with a columnar knife head. A columnar positioning head is fixed on the outer end surface of the knife head. The positioning head, the knife head and the knife rod are coaxially arranged, and the outer diameter of the positioning head is smaller than the outer diameter of the knife head. An elastic member is also provided in the knife barrel, which can generate resistance to the knife rod in the direction of the operating end when the knife rod moves relative to the knife barrel toward the hole opening end. The hole chamfering tool of the mold can improve the chamfering precision and processing quality.

Description

Technical Field

[0001] The invention belongs to the technical field of mold processing and relates to a hole chamfering tool for a mold. Background Art

[0002] The injection mold needs to control the cavity temperature, so a large number of water channels will be opened on the injection mold. As a requirement of the hole opening process, the water channel hole will pass through the mold surface. After the hole is opened, it will be sealed with a plug. In order to improve the sealing and stability, a sealing gasket will be set at the plug. However, the edge of the hole after opening is relatively sharp and has burrs, which can easily scratch the sealing gasket, resulting in poor sealing and leakage. Therefore, the edge of the hole needs to be chamfered to make the edge of the hole become a smooth cone, which requires a chamfering knife to operate.

[0003] When a manual hand-held chamfering tool is used for chamfering, high requirements are placed on the operating accuracy and operating stability. If the chamfering tool is not coaxial with the hole or the chamfering tool shakes, the chamfering quality will be affected. In response to this problem, the patent document (application number: 201922137053.9) discloses a component chamfering device, including a sleeve, three brackets are fixedly connected to the outer side of the sleeve, a pressure rod is slidably connected to the upper side of the sleeve, and a cutter head is fixedly connected to the lower side of the pressure rod. The cutter head includes two hinged blades, and the angles of the two blades can be adjusted. The chamfering device is fixed above the processing hole through three brackets and a foot embedded with a magnetic block. The cutter head will not shake during the chamfering process to avoid uneven chamfering. However, the three brackets require a relatively large surface area at the hole to cooperate, which is difficult to apply to areas with narrow space. In particular, the feed amount of the cutter head during the hole opening process is manually controlled. If too much force is applied, the feed amount will be too large, the blade will be embedded too deeply in the edge of the hole and become stuck, and the rotation operation will not be smooth, affecting the smoothness of the chamfered surface, thereby affecting the processing quality. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems in the prior art and to propose a mold hole chamfering tool to solve the problems of low precision and poor quality of the hole chamfering of the prior mold.

[0005] The objective of the present invention can be achieved through the following technical scheme: a hole chamfering knife for a mold, comprising a straight cylindrical knife barrel and a knife rod slidably inserted into the knife barrel and capable of rotating, one end of the knife barrel being an operating end and the other end being a hole opening end, one end of the knife rod extending out of the operating end of the knife barrel and being fixed with a handle, the other end of the knife rod being able to extend out of the hole opening end of the knife barrel and being fixed with a columnar knife head, characterized in that a columnar positioning head is fixed on the outer end surface of the knife head, the positioning head, the knife head and the knife rod being coaxially arranged, and the outer diameter of the positioning head being smaller than the outer diameter of the knife head, and an elastic member being further provided in the knife barrel which can generate resistance to the knife rod toward the operating end when the knife rod moves relative to the knife barrel toward the hole opening end.

[0006] When chamfering the orifice of the mold, align the positioning head and insert it into the hole until the end face of the knife barrel fits against the outer surface of the mold orifice, and the outer peripheral wall of the positioning head fits against the hole wall to form a positioning, so that the tool rod and the hole remain coaxial, and the cutter head rests on the edge of the orifice. By pushing and rotating the tool rod with the handle, the cutter head can gradually cut the edge of the orifice to achieve chamfering. Since a positioning head is provided that cooperates with the hole wall, the coaxiality of the tool rod, the cutter head and the hole is guaranteed, so that the cutting amount of the edge of the orifice is circumferentially uniform, ensuring the coaxiality of the chamfered surface of the orifice and the hole. At the same time, the positioning of the positioning head also makes the rotation of the tool rod more stable, improves the processing accuracy, and ensures the processing quality. Furthermore, an elastic member is provided in the knife barrel, which supports the knife rod and generates reverse resistance during the processing. The reverse resistance is mainly the elastic force of the elastic member after compression. Of course, it also includes the friction resistance between some elastic members and the knife rod and knife barrel. However, the reverse resistance can avoid excessive feed of the knife head in the initial stage due to excessive force, which may cause the knife head to get stuck with the edge of the hole and affect the chip quality. That is, the elastic member enables the knife head to feed gradually and evenly, thereby improving the chamfering accuracy and processing quality.

[0007] In the above-mentioned hole chamfering knife of the mold, a support bearing is fixed in the knife barrel near the opening end, a thrust bearing is fixedly sleeved on the knife rod, the knife rod slides through the support bearing, and the outer peripheral wall of the knife rod slides with the inner peripheral wall of the inner ring of the support bearing, the thrust bearing is slidably arranged in the knife barrel, and the outer peripheral wall of the outer ring of the thrust bearing slides with the inner peripheral wall of the knife barrel, and the elastic member is arranged between the support bearing and the thrust bearing. Through the arrangement of the support bearing and the thrust bearing, the knife rod is supported and positioned at two points, the knife rod is more stable, and the rotation is smoother.

[0008] In the above-mentioned orifice chamfering cutter of the mold, the elastic member includes a rubber block that is columnar and axially arranged in the knife barrel, the rubber block is provided with a mounting hole in the axial direction, the above-mentioned knife rod passes through the mounting hole of the rubber block, and the rubber block is tightened between the outer peripheral wall of the knife rod and the inner peripheral wall of the knife barrel, one end face of the rubber block is in contact with the inner end face of the support bearing, and the other end face is in contact with the inner end face of the thrust bearing. The rubber block is tightened between the knife rod and the knife barrel, so that the deformation of the rubber block is small and the deformation speed is uniform, thereby making the feed speed of the cutter head more uniform and improving the processing accuracy. At the same time, the rubber block tightened on the knife rod also makes the knife rod more stable, and the friction resistance generated when the knife rod rotates also makes the rotation operation of the knife rod feel better. After the knife rod rotates at any angle, the rubber block can be limited to avoid its retreat, and the rotation angle control is also more precise. In order to provide elastic force to the knife rod toward the operating end, the elastic member can also be a coil spring, which is sleeved on the knife rod, with one end of the coil spring resting on the support bearing and the other end resting on the thrust bearing.

[0009] In the above-mentioned mold hole chamfering knife, a slot is opened circumferentially on the inner circumferential wall of the knife barrel near the operating end, a retaining spring is clamped in the slot, the knife rod passes through the retaining spring, and the outer end face of the thrust bearing is abutted against the inner end face of the retaining spring under the action of the elastic member. The thrust bearing is restricted in the knife barrel by the retaining spring, which is convenient for disassembly and assembly, and the overall structure after assembly is more stable.

[0010] In the above-mentioned hole chamfering cutter of the mold, the outer end face edge of the cutter head has a hole opening conical surface in the circumferential direction, the hole opening conical surface has a plurality of blades in the circumferential direction, a screw hole is opened at the center of the outer end face of the cutter head, a stud is provided on the end face of the positioning head, and the stud of the positioning head is screwed and fixed in the screw hole of the cutter head, and the outer diameter of the larger end of the hole opening conical surface is larger than the outer diameter of the positioning head. The hole opening conical surface can be applied to holes of different diameters, and the positioning head is threadedly connected to the cutter head through the stud, and the positioning head of different outer diameters can also be replaced according to the diameter of the hole, which is more applicable.

[0011] In the above-mentioned hole chamfering cutter of the mold, a partition is fixed in the knife barrel near the hole end, the above-mentioned support bearing is located on the inner side of the partition and abuts against the partition, the knife rod passes through the partition, and a chip storage cavity is formed between the outer end face of the partition and the inner end face of the cutter head. A plurality of chip removal grooves are opened circumferentially on the outer peripheral surface of the cutter head, and the outer ends of the chip removal grooves penetrate to the cone surface of the hole, and the inner ends penetrate to the inner end face of the cutter head and are connected to the chip storage cavity. Most of the holes on the mold are waterway holes, and the debris generated by chamfering is not easy to remove after falling into them. For this purpose, a chip storage cavity and a chip removal groove are provided, and the positioning head can block the hole. At the same time, the debris generated by the rotation and cutting of the cutter head can enter the chip storage cavity along the chip removal groove, thereby preventing the debris from falling into the hole and also avoiding the accumulation of debris that is difficult to discharge and affects the processing quality.

[0012] In the above-mentioned hole chamfering cutter of the mold, the inner circumferential wall of the knife barrel has an annular guide convex edge near the opening end, the outer circumferential wall of the cutter head slides with the inner circumferential wall of the guide convex edge, the axial length of the guide convex edge is less than the axial length of the cutter head, and the inner end of the cutter head can protrude the guide convex edge inward. The guide convex edge can position the cutter head to ensure the stability of the cutter head position, and at the same time, the inner circumference of the guide convex edge covers the chip groove to form a channel, and the axial length of the guide convex edge is small, so that the chips can quickly pass through and enter the chip storage chamber.

[0013] In the above-mentioned hole chamfering cutter of the mold, the blades are all in the shape of long strips and protrude from the hole cone surface, one side long edge of the blade is the cutting edge, and the cutting edges of several blades are all facing the same side along the circumference of the cutter head, one end of the blade extends to the edge of the smaller end of the hole cone surface, and the other end extends to the edge of the larger end of the hole cone surface, and the other end of the blade is inclined along the circumference of the cutter head to the side opposite to the cutting edge, the number of the chip grooves is adapted to the number of blades, and one end of the chip groove is close to the other end of the blade, and the other end of the chip groove is inclined along the circumference of the cutter head to the side opposite to the cutting edge. When the cutter head rotates and cuts the edge of the hole, the inclined blade can push and guide the chips, so that the chips move along the blade to the edge of the hole cone surface with a larger diameter, and then enter the chip storage chamber through the chip groove, so as to avoid the chips accumulating in the space between two adjacent blades and affecting the processing accuracy.

[0014] In the above-mentioned mold hole chamfering cutter, the outer peripheral wall of the positioning head is provided with a clearance groove in the circumferential direction near the position of the cutter head, and the smaller end of the opening cone surface is connected with the bottom of the clearance groove. The chips with small volume that are not pushed into the chip removal groove in time can fall into the clearance groove to avoid accumulation between two adjacent blades and affecting the processing accuracy. The chips in the clearance groove can be taken out by the positioning head when the tool rod is lifted after the processing is completed, and will not fall into the hole.

[0015] In the above-mentioned mold hole chamfering cutter, the knife barrel includes a barrel body and an end cover, a positioning concave shoulder is provided on the end face of the barrel body, the edge of the partition plate abuts against the positioning concave shoulder, the end cover is screwed to the end of the barrel body, and the above-mentioned chip storage cavity is formed between the end face of the partition plate, the inner peripheral surface of the end cover and the inner end face of the cutter head. This structure makes the end cover detachable, which is convenient for cleaning the debris in the chip storage cavity.

[0016] Compared with the prior art, the hole chamfering tool of this mold has the following advantages:

[0017] 1. Due to the positioning head that cooperates with the hole wall, the coaxiality of the tool rod, the tool head and the hole is guaranteed, so that the cutting amount of the edge of the hole is uniform in the circumferential direction, ensuring the coaxiality of the chamfered surface of the hole and the hole. At the same time, the positioning of the positioning head also makes the rotation of the tool rod more stable, improves the processing accuracy and ensures the processing quality.

[0018] 2. Since an elastic part is also provided in the knife barrel, the elastic part supports the knife rod during the processing and generates a reverse elastic force, thereby avoiding excessive feed of the cutter head in the initial stage due to excessive force, and the cutter head and the edge of the hole getting stuck and affecting the chip quality. That is, the elastic part enables the cutter head to be fed gradually and evenly, thereby improving the chamfering accuracy and processing quality.

[0019] 3. Due to the provision of the chip storage chamber and the chip discharge groove, the positioning head can seal the hole. At the same time, the chips generated by the rotation and cutting of the cutter head can enter the chip storage chamber along the chip discharge groove, thereby preventing the chips from falling into the hole and also avoiding the impact of the processing quality due to the difficulty in discharging and accumulation of chips.

[0020] 4. Since the positioning head is provided with a clearance groove, the chips that are small in size and have not been pushed into the chip removal groove in time can fall into the clearance groove to avoid accumulation between two adjacent cutting edges and affect the processing accuracy. The chips in the clearance groove can be taken out by the positioning head when the tool rod is lifted after the processing is completed, and will not fall into the hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional structural schematic diagram of the hole chamfering tool of the mold.

[0022] Figure 2 It is a structural cross-sectional view of the orifice chamfering cutter when the elastic part is not compressed.

[0023] Figure 3 It is a structural cross-sectional view of the hole chamfering cutter when the elastic part is compressed.

[0024] Figure 4 It is a schematic diagram of the local three-dimensional structure of the cutter head and the positioning head.

[0025] Figure 5 yes Figure 2 A magnified view of the structure at center.

[0026] Figure 6 It is a bottom view of the structure of the cutter head.

[0027] In the figure, 1, knife cylinder; 11, cylinder body; 111, slot; 112, positioning shoulder; 12, end cover; 121, guide convex edge; 13, operating end; 14, opening end; 15, chip storage chamber; 2, knife rod; 21, handle; 3, knife head; 31, opening cone; 32, blade; 321, cutting edge; 33, screw hole; 34, chip groove; 4, positioning head; 41, stud; 42, clearance groove; 5, elastic member; 51, mounting hole; 6, support bearing; 7, thrust bearing; 8, partition; 9, retaining spring. DETAILED DESCRIPTION

[0028] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0029] Embodiment 1:

[0030] like Figure 1 , Figure 2As shown, a hole chamfering knife for a mold includes a knife barrel 1 and a knife rod 2. The knife barrel 1 is in a straight cylindrical shape. The length of the knife rod 2 is greater than that of the knife barrel 1. The knife rod 2 is slidably inserted into the knife barrel 1, and the knife rod 2 can rotate circumferentially relative to the knife barrel 1. One end of the knife barrel 1 is an operating end 13, and the other end is an opening end 14. One end of the knife rod 2 extends out of the operating end 13 of the knife barrel 1 and is vertically fixed with a handle 21 for rotating the knife rod 2. The other end of the knife rod 2 can extend out of the opening end 14 of the knife barrel 1 and is fixed with a columnar knife head 3. The outer diameter of the knife head 3 is greater than the outer diameter of the knife rod 2 and smaller than the inner diameter of the knife barrel 1. A columnar positioning head 4 is fixed on the outer end surface of the knife head 3. The positioning head 4, the knife head 3 and the knife rod 2 are coaxially arranged, and the outer diameter of the positioning head 4 is smaller than the outer diameter of the knife head 3. A support bearing 6 is fixed near the opening end 14 in the knife barrel 1, that is, the inner circumferential wall of the knife barrel 1 is tightly matched with the outer circumferential wall of the outer ring of the support bearing 6, and a thrust bearing 7 is fixedly sleeved on the knife rod 2, that is, the outer circumferential wall of the knife rod 2 is tightly matched with the inner circumferential wall of the inner ring of the thrust bearing 7, and the knife rod 2 slides through the support bearing 6, and the outer circumferential wall of the knife rod 2 is slidably matched with the inner circumferential wall of the inner ring of the support bearing 6, and the thrust bearing 7 is slidably arranged in the knife barrel 1, and the outer circumferential wall of the outer ring of the thrust bearing 7 is slidably matched with the inner circumferential wall of the knife barrel 1, and an elastic Part 5, the elastic part 5 is a columnar rubber block, and the rubber block is provided with a mounting hole 51 along the axial direction. The rubber block is axially arranged in the knife barrel 1, and the knife rod 2 passes through the mounting hole 51 of the rubber block, and the rubber block is tightened between the outer circumferential wall of the knife rod 2 and the inner circumferential wall of the knife barrel 1. One end face of the rubber block is in contact with the inner end face of the support bearing 6, and the other end face is in contact with the inner end face of the thrust bearing 7. When the knife rod 2 is operated to move the knife rod 2 toward the opening end 14, the thrust bearing 7 can squeeze the rubber block, and the rubber block generates reverse resistance to the knife rod 2. A slot 111 is circumferentially provided on the inner circumferential wall of the knife barrel 1 close to the operating end 13, and a retaining spring 9 is clamped in the slot 111. The knife rod 2 passes through the retaining spring 9. Under the action of the rubber block, the outer end face of the thrust bearing 7 is in contact with the inner end face of the retaining spring 9, combined with Figure 3 As shown, when the knife rod 2 moves toward the opening end 14 , the thrust bearing 7 can compress the rubber block and separate from the retaining spring 9 , and the outer end of the knife head 3 extends out of the opening end 14 of the knife cylinder 1 .

[0031] Combination Figure 4 , Figure 5 , Figure 6As shown, the outer end surface edge of the cutter head 3 has an opening cone surface 31 in the circumferential direction, and the opening cone surface 31 has six blades 32 in the circumferential direction. A screw hole 33 is provided at the center of the outer circumferential surface of the cutter head 3. A stud 41 is provided on the end surface of the positioning head 4, and the stud 41 of the positioning head 4 is screwed and fixed in the screw hole 33 of the cutter head 3. The outer diameter of the larger end of the opening cone surface 31 is larger than the outer diameter of the positioning head 4. A clearance groove 42 is provided in the circumferential direction of the outer circumferential wall of the positioning head 4 near the cutter head 3, and the smaller end of the opening cone surface 31 is connected to the bottom of the clearance groove 42. The knife cylinder 1 includes a cylinder body 11 and an end cover 12. A positioning concave shoulder 112 is provided on the end surface of the cylinder body 11. A circular partition 8 is provided inside the cylinder body 11. The edge of the partition 8 abuts against the positioning concave shoulder 112. The knife rod 2 passes through the partition 8. The end cover 12 is screwed to the end of the cylinder body 11 and presses the partition 8. The support bearing 6 is located on the inner side of the partition 8 and abuts against the partition 8. A chip storage chamber 15 is formed between the outer end surface of the partition 8, the inner circumferential surface of the end cover 12 and the inner end surface of the cutter head 3. Six chip removal grooves 34 are circumferentially provided on the outer circumferential surface of the cutter head 3. The outer ends of the chip removal grooves 34 penetrate through the opening cone surface 31, and the inner ends penetrate through the inner end surface of the cutter head 3 and are connected with the chip storage chamber 15. The inner wall of the knife barrel 1 has an annular guide protrusion 121 circumferentially near the opening end 14, the outer wall of the knife head 3 is slidingly matched with the inner wall of the guide protrusion 121, the axial length of the guide protrusion 121 is smaller than the axial length of the knife head 3, and when the thrust bearing 7 and the retaining spring 9 abut against each other, the guide protrusion 121 protrudes inward from the inner end of the knife head 3. The blades 32 are all long and protrude from the opening cone surface 31. The long edge of one side of the blade 32 is the cutting edge 321, and the cutting edges 321 of the six blades 32 all face the same side along the circumference of the cutter head 3. One end of the blade 32 extends to the edge of the smaller end of the opening cone surface 31, and the other end extends to the edge of the larger end of the opening cone surface 31, and the other end of the blade 32 is inclined toward the side facing away from the cutting edge 321 along the circumference of the cutter head 3. One end of the chip groove 34 is close to the other end of the blade 32, and the other end of the chip groove 34 is inclined toward the side facing away from the cutting edge 321 along the circumference of the cutter head 3.

[0032] Embodiment 2:

[0033] The structure of the hole chamfering knife of the mold is basically the same as that of the embodiment 1, except that the elastic member 5 adopts a coil spring, which is sleeved on the tool rod 2, and one end of the coil spring abuts against the support bearing 6, and the other end abuts against the thrust bearing 7. When the tool rod 2 moves toward the hole opening end 14, the coil spring can be compressed, and the coil spring generates an elastic force on the tool rod 2 toward the operating end 13.

[0034] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0035] Although the terms such as knife barrel 1, barrel 11, and slot 111 are used more frequently in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A hole chamfering knife for a mold, comprising a straight-cylindrical knife barrel (1) and a knife rod (2) slidably inserted into the knife barrel (1) and capable of rotating, wherein one end of the knife barrel (1) is an operating end (13) and the other end is an opening end (14), one end of the knife rod (2) extends out of the operating end (13) of the knife barrel (1) and is fixed with a handle (21), and the other end of the knife rod (2) can extend out of the opening end (14) of the knife barrel (1) and is fixed with a columnar knife head (3), characterized in that: A columnar positioning head (4) is fixed on the outer end surface of the cutter head (3); the positioning head (4), the cutter head (3) and the cutter rod (2) are coaxially arranged, and the outer diameter of the positioning head (4) is smaller than the outer diameter of the cutter head (3); the cutter barrel (1) is also provided with an elastic member (5) capable of generating resistance to the cutter rod (2) in the direction of the operating end (13) when the cutter rod (2) moves relative to the cutter barrel (1) toward the hole opening end (14); a support bearing (6) is fixed in the cutter barrel (1) near the hole opening end (14); the outer end surface edge of the cutter head (3) has a hole opening cone in the circumferential direction. A partition plate (8) is fixed in the knife barrel (1) near the opening end (14), the support bearing (6) is located on the inner side of the partition plate (8) and abuts against the partition plate (8), the knife rod (2) passes through the partition plate (8), and a chip storage chamber (15) is formed between the outer end surface of the partition plate (8) and the inner end surface of the knife head (3), and a plurality of chip removal grooves (34) are circumferentially opened on the outer peripheral surface of the knife head (3), the outer ends of the chip removal grooves (34) penetrate the opening conical surface (31), and the inner ends penetrate the inner end surface of the knife head (3) and are connected to the chip storage chamber (15).

2. The hole chamfering tool of the mold according to claim 1, characterized in that: A thrust bearing (7) is fixedly sleeved on the knife rod (2); the knife rod (2) slides through the support bearing (6), and the outer peripheral wall of the knife rod (2) is slidably matched with the inner peripheral wall of the inner ring of the support bearing (6); the thrust bearing (7) is slidably arranged in the knife barrel (1), and the outer peripheral wall of the outer ring of the thrust bearing (7) is slidably matched with the inner peripheral wall of the knife barrel (1); and the elastic member (5) is arranged between the support bearing (6) and the thrust bearing (7).

3. The hole chamfering tool of the mold according to claim 2, characterized in that: The elastic member (5) comprises a rubber block which is columnar and axially arranged in the knife barrel (1); the rubber block is provided with a mounting hole (51) along the axial direction; the knife rod (2) passes through the mounting hole (51) of the rubber block, and the rubber block is stretched between the outer peripheral wall of the knife rod (2) and the inner peripheral wall of the knife barrel (1); one end face of the rubber block abuts against the inner end face of the support bearing (6), and the other end face abuts against the inner end face of the thrust bearing (7).

4. The hole chamfering tool of the mold according to claim 3, characterized in that: A clamping groove (111) is formed on the inner circumferential wall of the knife barrel (1) near the operating end (13), and a clamping spring (9) is clamped in the clamping groove (111). The knife rod (2) passes through the clamping spring (9), and the outer end surface of the push bearing (7) is pressed against the inner end surface of the clamping spring (9) under the action of the elastic member (5).

5. The hole chamfering tool of the mold according to claim 2, 3 or 4, characterized in that: The opening conical surface (31) has a plurality of blades (32) on its circumference, a screw hole (33) is provided at the center of the outer end surface of the cutter head (3), a stud (41) is provided on the end surface of the positioning head (4), and the stud (41) of the positioning head (4) is screwed and fixed in the screw hole (33) of the cutter head (3), and the outer diameter of the larger end of the opening conical surface (31) is larger than the outer diameter of the positioning head (4).

6. The hole chamfering cutter of the mold according to claim 5, characterized in that: The inner circumferential wall of the knife barrel (1) is provided with an annular guide protrusion (121) in the circumferential direction near the opening end (14); the outer circumferential wall of the knife head (3) is slidably matched with the inner circumferential wall of the guide protrusion (121); the axial length of the guide protrusion (121) is smaller than the axial length of the knife head (3); and the inner end of the knife head (3) can protrude the guide protrusion (121) inwardly.

7. The hole chamfering cutter of the mold according to claim 5, characterized in that: The blades (32) are all in the shape of long strips and protrude from the opening cone surface (31); one long edge of the blade (32) is a cutting edge (321); and the cutting edges (321) of a plurality of blades (32) are all oriented toward the same side along the circumference of the cutter head (3); one end of the blade (32) extends to the edge of the smaller end of the opening cone surface (31); the other end extends to the edge of the larger end of the opening cone surface (31); and the other end of the blade (32) is inclined toward the side facing away from the cutting edge (321) along the circumference of the cutter head (3); the number of the chip removal grooves (34) is adapted to the number of the blades (32); one end of the chip removal groove (34) is close to the other end of the blade (32); and the other end of the chip removal groove (34) is inclined toward the side facing away from the cutting edge (321) along the circumference of the cutter head (3).

8. The hole chamfering cutter of the mold according to claim 5, characterized in that: A clearance groove (42) is circumferentially provided on the outer peripheral wall of the positioning head (4) near the position of the cutter head (3), and the smaller end of the opening conical surface (31) is in contact with the bottom of the clearance groove (42).

9. The hole chamfering tool of the mold according to claim 5, characterized in that: The knife barrel (1) comprises a barrel body (11) and an end cover (12); a positioning concave shoulder (112) is provided on the end face of the barrel body (11); the edge of the partition plate (8) abuts against the positioning concave shoulder (112); the end cover (12) is screwed to the end of the barrel body (11); and the above-mentioned chip storage chamber (15) is formed between the end face of the partition plate (8), the inner peripheral surface of the end cover (12) and the inner end face of the knife head (3).

Images