CN201833031U

CN201833031U - Assembled extension expanding drill

Info

Publication number: CN201833031U
Application number: CN2010202093366U
Authority: CN
Inventors: 魏成双; 魏崇巍; 潘文娟
Original assignee: Harbin Turbine Co Ltd
Current assignee: Harbin Turbine Co Ltd
Priority date: 2010-05-31
Filing date: 2010-05-31
Publication date: 2011-05-18
Anticipated expiration: 2020-05-31

Abstract

The utility model relates to an extension expanding drill, in particular to an assembled extension expanding drill. The utility model solves the problems that the conventional extension expanding drill is discarded only when the drill bit cannot be sharpened or tipped after wear, thereby leading to great waste. A flat neck and a taper shank are processed on the end surface of a connecting end of a drill bit of the expanding drill in sequence; a groove is formed on the end surface of a connecting end of a cutter arbor; a taper hole with the same taper as the taper shank is formed on the bottom end surface of the groove; the flat neck is spliced together with the groove and is in clearance fit with the groove for transmitting torque; the taper shank is inserted in the taper hole for ensuring the coaxiality of the drill bit and the cutter arbor of the expanding drill; and the drill bit of the expanding drill is axially and detachably connected with the cutter arbor through a connecting piece penetrating the drill bit of the expanding drill. The original welded extension expanding drill with the integral structure is replaced by the extension expanding drill, thereby saving a great amount of cutter materials and reducing the operating cost of the extension expanding drill.

Description

A kind of assembled spreading reamer

Technical field

The utility model relates to a kind of spreading reamer, is specifically related to a kind of spreading reamer that is used to process steam turbine.

Background technology

The spreading reamer is the cutter that must use in the processing steam turbine, annual use amount is very big, former is the overall structure of welded type with cutter, as long as the bit wear of cutter is just scrapped processing behind reconditioning or the tipping again, because this cutter is a major diameter spreading reamer, diameter is more than ∮ 70mm, length is greater than 500mm, every very high cutter manufacturing expense (material and processing charges), because the integrally-built spreading reamer of existing welded type causes significant wastage as long as the bit wear of cutter is just scrapped processing behind reconditioning or the tipping again.

The utility model content

The utility model, causes the problem of significant wastage, and then a kind of assembled spreading reamer is provided as long as the bit wear of cutter is just scrapped processing behind reconditioning or the tipping again in order to solve existing spreading reamer.

The utility model is to solve the problems of the technologies described above the technical scheme of taking to be:

Spreading reamer of the present invention comprises reamer drill bit and reamer knife bar, described spreading reamer also comprises connector, be processed with flat neck, taper shank on the link end face of described reamer drill bit from inside to outside successively, be processed with groove on the link end face of reamer knife bar, on the bottom face of groove, have the taper hole that has identical tapering with taper shank, described flat neck be plugged on described groove and the two matched in clearance in order to transmit moment of torsion, described taper shank is inserted in the described taper hole in order to guarantee the axiality of reamer drill bit and reamer knife bar; Described reamer drill bit and the reamer knife bar connector shaft by passing the reamer drill bit is to removably connecting.

The beneficial effects of the utility model are: the utility model adopts the spreading reamer of fabricated construction, structure by the design junction, guaranteed the moment of torsion of installation accuracy and transmission, realized the split pattern of reamer drill bit and reamer knife bar, the reamer drill bit that only need more renew after reamer is scrapped gets final product.Application of the present utility model will substitute original welded type overall structure spreading reamer, solved the tool wear tipping after integral body scrap situation, saved a large amount of cutter materials, greatly reduce spreading reamer cost of use.(major diameter) reamer of this structure only needs stock's reamer drill bit, has also reduced the stock space greatly.Connected mode of the present invention is reliable, can satisfy the type of attachment of instructions for use.

Description of drawings

Fig. 1 is the integrally-built front view of assembled spreading reamer described in the utility model, and Fig. 2 is the left view of Fig. 1, and Fig. 3 is the vertical view of Fig. 1; Fig. 4 is the front view of reamer drill bit 1, and Fig. 5 is the left view of Fig. 4, and Fig. 6 is the vertical view of Fig. 4; Fig. 7 is the front view of reamer knife bar 2, and Fig. 8 is the left view of Fig. 7, and Fig. 9 is the vertical view of Fig. 7.

The specific embodiment

The specific embodiment one: shown in Fig. 1～9, the described a kind of assembled spreading reamer of present embodiment comprises reamer drill bit 1 and reamer knife bar 2, described spreading reamer also comprises connector 3, be processed with flat neck 1-1 on the link end face of described reamer drill bit 1 from inside to outside successively, taper shank 1-2, be processed with groove 2-1 on the link end face of reamer knife bar 2, on the bottom face of groove 2-1, have the taper hole 2-2 that has identical tapering with taper shank 1-2, described flat neck 1-1 be plugged on described groove 2-1 and the two matched in clearance in order to transmit moment of torsion, described taper shank 1-2 is inserted in the described taper hole 2-2 in order to guarantee the axiality of reamer drill bit 1 and reamer knife bar 2; Described reamer drill bit 1 and reamer knife bar 2 axially removably connect by the connector 3 that passes reamer drill bit 1.After reamer drill bit 1 and reamer knife bar 2 are installed by connector 3, guarantee the complete correspondence of the blade and the chip area on the reamer knife bar 2 of reamer drill bit 1.

The specific embodiment two: shown in Fig. 4～9, the tapering of the described taper shank 1-2 of present embodiment, the tapering of taper hole 2-2 are 1:30.The reamer drill bit is connected by the 1:30 taper shank with knife bar, guarantees the coaxial accuracy requirement of its blade and knife bar caudal peduncle.Other composition and annexation are identical with the specific embodiment one.

The specific embodiment three: as shown in Figure 7, present embodiment has waist hole 2-3 on the sidewall that has the chip area end of reamer knife bar 2.Waist hole 2-3 is set, is convenient to installing/dismounting reamer drill bit.Other composition and annexation are identical with the specific embodiment one or two.

The specific embodiment four: the axiality of the blade cylindrical of described taper shank 1-2 of present embodiment and reamer drill bit 1 is less than 0.02mm, to guarantee the installation accuracy of assembled spreading reamer.Other composition and annexation are identical with the specific embodiment one, two or three.

The specific embodiment five: the described connector 3 of present embodiment is a stretching screw, and described reamer drill bit 1 is connected by the stretching screw axial thread that passes reamer drill bit 1 with reamer knife bar 2.With stretching screw assembling, clamping, easy operating can be guaranteed bonding strength.Other composition and annexation are identical with the specific embodiment one, two, three or four.

Embodiment:

Reamer drill bit 1: the geometric parameter of reamer drill bit 1 is: right hand helix angle α is 20 °, and taper lead angle β is 30 °, and the cutting cone first relief angle γ 1 is that 7 ° of cutting cones, the second relief angle γ 2 is 12 °, and circumferential teeth anterior angle δ is 5 °; The wide face of cylinder of 2mm is stayed at the cylindrical place, and circumferential teeth relief angle ε thereafter is 20 °.The outside diameter φ of taper shank 1-2 is 30, and the tapering of taper shank 1-2 is 1:30, and 1:30 taper shank and reamer blade outer circles require in the 0.02mm, to guarantee assembling back required precision.Be designed to stepped hole (diameter is 9 ㎜), with the M8 stretching screw it be clamped on the knife bar, design thickness is that the flat neck of 34 ㎜ is in order to link to each other, to transmit moment of torsion with knife bar.

Reamer knife bar 2: the reamer knife bar is designed to 20 ° of right hand helix angles (unified mutually with the reamer drill bit) shown in Fig. 7～9, the groove width of design is that 34 ㎜ grooves cooperate with reamer drill bit 34 flat collar cracks, transmits moment of torsion.The 1:30 taper hole of φ 30 links to each other with the reamer drill bit, and width is that the waist hole of 12.2 ㎜ is used to dismantle reamer drill bit (utilizing drift), and the pattern taper shank of standard is connected with lathe.

Claims

1. assembled spreading reamer, described spreading reamer comprises reamer drill bit (1) and reamer knife bar (2), it is characterized in that: described spreading reamer also comprises connector (3), be processed with flat neck (1-1) on the link end face of described reamer drill bit (1) from inside to outside successively, taper shank (1-2), be processed with groove (2-1) on the link end face of reamer knife bar (2), on the bottom face of groove (2-1), have the taper hole (2-2) that has identical tapering with taper shank (1-2), described flat neck (1-1) be plugged on described groove (2-1) and the two matched in clearance in order to transmit moment of torsion, described taper shank (1-2) is inserted in the described taper hole (2-2) in order to guarantee the axiality of reamer drill bit (1) and reamer knife bar (2); Described reamer drill bit (1) and reamer knife bar (2) axially removably connect by the connector (3) that passes reamer drill bit (1).

2. a kind of assembled spreading reamer according to claim 1 is characterized in that: the tapering of the tapering of described taper shank (1-2), taper hole (2-2) is 1:30.

3. a kind of assembled spreading reamer according to claim 1 and 2 is characterized in that: have waist hole (2-3) on the sidewall that has the chip area end of reamer knife bar (2).

4. a kind of assembled spreading reamer according to claim 3 is characterized in that: the axiality of the blade cylindrical of described taper shank (1-2) and reamer drill bit (1) is less than 0.02mm.

5. according to claim 1,2 or 4 described a kind of assembled spreading reamers, it is characterized in that: described connector (3) is a stretching screw, and described reamer drill bit (1) is connected by the stretching screw axial thread that passes reamer drill bit (1) with reamer knife bar (2).