CN103521860A - knives - Google Patents

Abstract

A cutter comprises a cutter core, a reverse pyramid arranged on the cutter core in a sleeved mode, a pressurizing spring and a fixing head, wherein two ends of the pressurizing spring are elastically abutted to the reverse pyramid and the fixing head respectively, the cutter core comprises a main body part and a drill connected to the main body part, the cross section of the main body part is triangular and provided with three side faces, the drill is provided with a first spiral groove, a second spiral groove and a third spiral groove, screw tap teeth are arranged on the top wall among the first spiral groove, the second spiral groove and the third spiral groove, a ring of the reverse pyramid is provided with three chip guide grooves, inlets of the three chip guide grooves correspond to outlets of the first spiral groove, the second spiral groove and the third spiral groove respectively, the three side faces of the main body part correspond to outlets of the first spiral groove, the second spiral groove and the third spiral groove respectively, and the edges of the chip guide grooves form corner guide blades. The invention can carry out drilling, tapping and chamfering treatment on the workpiece at one time, and the chamfering cone can chamfer holes with different depths, thus having strong practicability.

Description

knives

technical field

The invention relates to a processing device, in particular to a cutting tool.

Background technique

Existing drill bits and tap teeth are tools used for both drilling and tapping processes. In the field of mechanical processing, drill bits are generally used for drilling holes. Tap teeth are often used for processing inner holes and small holes. No matter Whether to process on a lathe or on a drilling machine, first install the drill bit on the fixture, perform the drilling process, then remove the drill bit, then install the tap teeth on the fixture, perform the tapping process, and finally turn the tool holder and use the tool to reverse Corner, to chamfer the hole.

However, the above series of steps of drilling, tapping and chamfering need to be completed step by step and repeated loading and unloading, which undoubtedly has the problems of time-consuming, laborious and low work efficiency. Moreover, in actual production, there is a large gap in the selection and use of tools. When different tools are used for drilling, tapping and chamfering, it is difficult to meet the requirements of machining accuracy, which may easily lead to product scrapping and increase manufacturing costs.

Contents of the invention

Based on this, it is necessary to provide a cutting tool to address the deficiencies in the prior art.

The present invention is achieved in the following manner: a cutting tool, including a long and long cutter core, a chamfer cone installed on the cutter core, a pressurizing spring and a fixed head in turn, and the two ends of the pressurizing spring are respectively The chamfer cone and the fixed head are elastically connected, and the cutter core includes a main body and a drill bit connected to the main body. The cross section of the main body is arranged in a triangular shape to have three axial sides. There is a triangular mounting groove to correspond to the main body of the cutter core, and the chamfered cone is provided with an axially penetrating triangular perforation to correspond to the main body of the cutter core; the surface of the drill bit is provided with a helical interval Extended first helical groove, second helical groove and third helical groove, the top wall between the first helical groove, the second helical groove and the third helical groove is provided with tap teeth for tapping, so The outer surface of the chamfering cone is provided with three guide grooves, the entrances of the three guide grooves correspond to the outlets of the first spiral groove, the second spiral groove and the third spiral groove respectively, and the three guide grooves of the main body The side faces respectively correspond to the outlets of the first helical groove, the second helical groove and the third helical groove, and corner edges are formed on the edge of the chip guide groove.

Further, the bottom tip of the drill bit is provided with a first groove, a second groove and a third groove, and the first groove, the second groove and the third groove are distributed around the center of the bottom tip of the drill bit, The groove bottom wall surfaces of the first groove, the second groove and the third groove are all arranged as arc surfaces.

Further, the first groove, the second groove and the third groove are arranged obliquely, and the two ends of the first groove communicate with the first spiral groove and the second spiral groove respectively, and the second groove Both ends communicate with the third helical groove and the first groove respectively, the upper end of the third groove communicates with the first helical groove, and the bottom end is a free end close to the center of the bottom tip of the drill bit.

Further, the chamfered cone is conical, including a base, a clamping portion connected to one end of the base, and a chamfered portion connected to the other end of the base. The generatrix of the chamfered part extends the chip guide groove, the top end of each chip guide groove extends to the base, and the bottom end of each chip guide groove communicates with the perforation.

Further, the entrances of the three chip guides are respectively opposite to the outlets of the first helical groove, the second helical groove and the third helical groove, and the chamfering edge is formed on the same side edge of each chip guide.

Further, the fixing head includes a body, a fixing part connected to one end of the body and a connecting part connected to the other end of the body, and the end connected to the connecting part of the body expands outward along its radial direction to form a limiting part, The outer diameter of the clamping part is smaller than the outer diameter of the base, thereby forming a step, and the two ends of the pressurizing spring are respectively sleeved on the connecting part of the clamping part and the fixed head, and elastically abut against the limit position of the fixed head and the base of the chamfered cone.

Further, the size of the through hole is smaller than the outer size of the drill bit, so that the bottom end of the chamfered cone can abut against the top of the drill bit.

Further, the three edges of the part of the main body connected to the drill bit are provided with chamfers to cooperate with the movement of the chamfered cone in the axial direction, and the holes of the chamfered cone are correspondingly provided with chamfers.

Further, the cross section of the installation groove is arranged in a triangular shape corresponding to the main body.

In summary, the cutting tool of the present invention is provided with a cutter core and a chamfering cone with tap teeth. During work, the cutter core drills and taps the workpiece, and the chamfering cone performs chamfering processing on the drilled hole. In this way, the workpiece can be drilled, tapped and chamfered at one time to improve work efficiency. Since the pressure spring is provided, the chamfering cone can chamfer holes with different depths, and the utility model has strong practicability. The setting of the first helical groove, the second helical groove, the third helical groove, and the chip guide groove greatly enhances the chip holding and chip removal capabilities of the drill tool, so that the tool can drill both through holes and blind holes. The bottom end of the drill bit is provided with the first groove, the second groove and the third groove, which strengthen the drilling ability of the drill bit, and ensure the smoothness of the hole wall at the bottom end of the through hole, effectively controlling the occurrence of burrs. Condition.

Description of drawings

Fig. 1 is a structural schematic diagram of the cutting tool of the present invention.

Fig. 2 is an exploded view of the tool shown in Fig. 1 .

Fig. 3 is a sectional view of the tool shown in Fig. 1 .

Fig. 4 is a bottom view of the core of the tool shown in Fig. 1 .

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

As shown in Fig. 1, Fig. 2 and Fig. 3, it is a cutting tool of the present invention, which is used for synchronous processing of drilling, tapping and chamfering of workpieces. The cutting tool includes a fixed head 10, one end of which is fixed to the fixed head 10 The knife core 20 on the knife core 20, the chamfered cone 30 sleeved on the knife core 20 and the pressurizing spring 40 sleeved on the knife core 20, the two ends of the pressurized spring 40 elastically resist the chamfered cone 30 and the knife core 20 respectively. Fix the head 10 on.

The fixed head 10 includes a body 11, a fixing portion 12 connected to one end of the body 11, and a connecting portion 13 connected to the other end of the body 11. The end of the body 11 connected to the connecting portion 13 expands outward along its radial direction. A limiting portion 14, the fixed head 10 is provided with a mounting groove 15 penetrating up and down, and the cross section of the mounting groove 15 is arranged in a triangular shape. The outer dimension of the connecting portion 13 is smaller than the inner diameter of the pressure spring 40 , and the outer dimension of the limiting portion 14 is larger than the outer diameter of the limiting portion 14 .

Please also refer to FIG. 4 , the cutter core 20 includes a main body 21 and a drill bit 22 connected to the main body 21 . The main body 21 is arranged in the shape of a long rod, and its cross section is arranged in a triangle corresponding to the installation groove 15 , thus forming three sides. The three edges of the part of the main body 21 connected to the drill bit 22 are all provided with chamfers to cooperate with the axial movement of the chamfer cone 30 .

The surface of the drill bit 22 is provided with a first helical groove 221, a second helical groove 222 and a third helical groove 223 extending helically from top to bottom at intervals. The first helical groove 221, the second helical groove 222 and the Stepped tap teeth 23 are provided on the outer end surface of the helical side wall between the third helical grooves 223 for tapping. The first helical groove 221, the second helical groove 222 and the third helical groove 223 respectively correspond to the three sides of the main body 21, so that the chips generated by the drill bit 22 during drilling and tapping are along the first helical groove 221, the third helical groove 223 and the third helical groove 223 respectively. The second helical groove 222 and the third helical groove 223 and three sides of the main body 21 are excluded.

The bottom tip of the drill bit 22 is provided with a first groove 224, a second groove 225 and a third groove 226, and the first groove 224, the second groove 225 and the third groove 226 surround the drill bit 22. Bottom tip center distribution. The groove bottom walls of the first groove 224 , the second groove 225 and the third groove 226 are all arranged in an arc shape. Wherein, the first groove 224, the second groove 225 and the third groove 226 are arranged obliquely, and the two ends of the first groove 224 communicate with the first helical groove 221 and the second helical groove 222 respectively, so The two ends of the second groove 225 communicate with the third helical groove 223 and the first groove 224 respectively. end.

The chamfered cone 30 includes a base 31 , a clamping portion 32 connected to one end of the base 31 , and a chamfered portion 33 connected to the other end of the base 31 . The base portion 31 and the clamping portion 32 are both cylindrical, and the clamping portion 32 has an outer diameter smaller than that of the base 31 , thereby forming a step for clamping the compression spring 40 . The center of the chamfering cone 30 is provided with a through hole 34 penetrating up and down. The cross section of the through hole 34 is triangular and corresponds to the main body 21 of the drill bit 22 . The size of the through hole 34 is smaller than the outer dimension of the drill bit 22 , so that the bottom end of the chamfered cone 30 can abut against the top of the drill bit 22 . The chamfered portion 33 is conical, and three chip guide grooves 331 extending along the generatrix of the chamfered portion 33 are evenly provided on the outer conical surface of the chamfered portion 33, and the top of each chip guide groove 331 extends to the base. 31, the bottom end communicates with the through hole 34. The entrances of the three chip guide grooves 331 are respectively opposite to the outlets of the first helical groove 221 , the second helical groove 222 and the third helical groove 223 , and chamfer edges 332 are formed on the same side edge of each chip guide groove 331 .

During assembly, the chamfering cone 30, the pressure spring 40, and the fixed head 10 are sleeved and installed on the cutter core 20 from top to bottom in sequence. The chamfered cone 30 is sleeved on the part of the main body 21 of the cutter core 20 close to the drill bit 22 , and the fixing head 10 is sleeved on the part of the main body 21 of the cutter core 20 away from the drill bit 22 . The two ends of the pressurizing spring 40 are respectively sleeved on the clamping portion 32 and the connecting portion 13 of the fixed head 10 and elastically abutted against the limiting portion 14 of the fixed head 10 and the base 31 of the chamfered cone 30. The main body part 21 is pierced on the perforation 34 of the chamfering cone 30. It can be understood that in other embodiments, the size of the perforation 34 is larger than the external dimension of the drill bit 22, and the two ends of the pressure spring 40 are respectively connected to the chamfer Cone 30 is fixedly connected with fixed head.

When the tool of the present invention processes the workpiece, the external driving device drives the fixed part 12 of the fixed head 10 to rotate, thereby indirectly driving the chamfering cone 30 and the cutter core 20 to rotate synchronously; at the same time, the external driving device pushes the cutter core 20 of the tool to the workpiece Drilling is carried out in the inner direction. During the drilling process, the cutter core 20 digs and drills holes on the workpiece under the action of the edges of the first groove 224, the second groove 225 and the third groove 226, and the formed chips pass through The first helical groove 221 , the second helical groove 222 , the third helical groove 223 , and the chip guide groove 331 of the chamfered pyramid 30 lead out to the outside. Simultaneously, the tap teeth 23 on the cutter core 20 carry out the same tapping to the hole wall of the drilled hole.

When the drill bit 22 drills into the workpiece to a certain depth, the chamfered cone 30 contacts the surface of the workpiece and pushes against each other. With the deepening of drilling and tapping, the workpiece pushes against the chamfered cone 30 and moves upward, and the pressure spring 40 is elastic. Compression, so that the length of the tool core 20 extending into the workpiece can be adjusted freely, until the top of the clamping part 32 contacts the bottom of the connecting part 13, the drill bit 22 can no longer penetrate into the workpiece, thereby reaching the maximum depth. During the drilling and tapping process of the drill bit 22 , the chamfering edge 332 of the chamfering cone 30 punches the edge of the entrance of the drilling hole to form a chamfer. It can be understood that when the drilled hole reaches the maximum depth, the top end of the clamping portion 32 and the bottom end of the connecting portion 13 abut against each other to limit the position and prevent the chamfering cone 30 and the fixing head 10 from being over-extruded. The compression spring 40 exceeds the bearing range of the compression spring 40 , reducing the service life of the compression spring 40 .

In summary, the cutting tool of the present invention is provided with the cutter core 20 and the chamfering cone 30 with the tap teeth 23. During work, the cutter core 20 drills and taps the workpiece, and the chamfering cone 30 pairs the drilling Perform chamfering treatment, so that the workpiece can be drilled, tapped and chamfered at one time to improve work efficiency. Since the pressure spring 40 is provided, the chamfering cone 30 can chamfer holes of different depths, which is highly practical. The setting of the first helical groove 221, the second helical groove 222, the third helical groove 223, and the chip guide groove 331 greatly enhances the chip holding and chip removal capabilities of the drill bit 22, so that the tool can drill through holes and blind holes. holes are available. The bottom end of the drill bit 22 is provided with a first groove 224, a second groove 225 and a third groove 226, which strengthens the drilling ability of the drill bit 22, and ensures the smoothness of the hole wall at the bottom end of the through hole, effectively The occurrence of glitches is controlled.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (9)

1. a cutter, it is characterized in that: it comprises the cutter core of a lengthwise, the sheathed chamfering being arranged on this cutter core is bored successively, pressing spring and gland, described pressing spring two ends respectively elasticity connect chamfering cone and gland, described cutter core comprises a main part and is connected in the drill bit of main part, the cross section setting triangular in shape of this main part is to have three axial sides, described gland runs through up and down and offers leg-of-mutton mounting groove with the main part of the sheathed described cutter core of correspondence, described chamfering cone is provided with the triangle axially running through and bores a hole with the main part of the sheathed described cutter core of correspondence, described bit face is offered the first helicla flute that extend at helical form interval, the second helicla flute and triple helical groove, described the first helicla flute, roof between the second helicla flute and triple helical groove is provided with screw tap tooth for tapping, the lateral surface ring of described chamfering cone is established three dregs guiding grooves, the entrance of described three dregs guiding grooves respectively with the first helicla flute, the outlet of the second helicla flute and triple helical groove is corresponding, three sides of described main part respectively with described the first helicla flute, the outlet of the second helicla flute and triple helical groove is corresponding, the edge of described dregs guiding groove forms lead angle sword.

2. cutter according to claim 1, it is characterized in that: the bottom tip of described drill bit is provided with the first groove, the second groove and the 3rd groove, described the first groove, the second groove and the 3rd groove are around the bottom tip central distribution of drill bit, and the bottom land wall of this first groove, the second groove and the 3rd groove is all arc surface setting.

3. cutter according to claim 2, it is characterized in that: described the first groove, the second groove and the 3rd groove are inclined to set, these the first groove two ends are communicated with respectively described the first helicla flute and the second helicla flute, described the second groove two ends are communicated with respectively triple helical groove and the first groove, the upper end of described the 3rd groove is communicated with the first helicla flute, and bottom is the free end near the bottom tip center of drill bit.

4. cutter according to claim 1, it is characterized in that: described chamfering cone is coniform, comprise a base portion, be connected in the holding section of base portion one end and be connected in the chamfered section of the base portion other end, on the male cone (strobilus masculinus) of described chamfered section, be evenly provided with the dregs guiding groove that three buses along chamfered section extend, the top of each dregs guiding groove extends to base portion, bottom is communicated with described perforation.

5. cutter according to claim 4, is characterized in that: the entrance of described three dregs guiding grooves is relative with the outlet of the first helicla flute, the second helicla flute and triple helical groove respectively, and the same side edge of each dregs guiding groove forms described lead angle sword.

6. cutter according to claim 4, it is characterized in that: described gland comprises a body, be connected in the fixed part of body one end and be connected in the connecting portion of the body other end, one end that described body is connected with connecting portion is radially outward expanded and is formed a limiting section along it, the external diameter of described holding section is less than the external diameter of base portion, thereby form a step, described pressing spring two ends are sheathed on respectively on the connecting portion of holding section and gland and elasticity is resisted against on the limiting section of gland and the base portion of chamfering cone.

7. cutter according to claim 1, is characterized in that: the size of described perforation is less than the external dimensions of described drill bit, thereby the bottom that chamfering is bored can be resisted against the top of drill bit.

8. cutter according to claim 1, is characterized in that: three seamed edges that described main part connects the part of drill bit are equipped with chamfering, and to coordinate described chamfering cone to move vertically, the perforation correspondence of described chamfering cone is provided with chamfering.

9. cutter according to claim 1, is characterized in that: the corresponding main part of the cross section setting triangular in shape of described mounting groove.

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