CN201471182U

CN201471182U - Hole enlarging cutter capable of positioning

Info

Publication number: CN201471182U
Application number: CN2009201912413U
Authority: CN
Inventors: 陈焕春
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-08-17
Filing date: 2009-08-17
Publication date: 2010-05-19
Anticipated expiration: 2019-08-17

Abstract

The utility model relates to a hole enlarging cutter capable of positioning. A cutting bar is directly fixed on a unit head main shaft, the hole enlarging cutter is mounted on and keyed with a conical body at the lower end of the cutting bar through a taper hole, and is fixed through a locking handle. The hole enlarging cutter is provided with a positioning structure for controlling the depth of the inner end face of a hole enlarging drill. A guide part on the cutting bar passes into a processed small hole to a proper position, and the hole enlarging cutter is assembled on the cutting bar. A reverse feed lever and the inner end face are processed well through a rough processed large hole. The hole enlarging cutter capable of positioning has the advantages that the large hole below the small hole of the element and the inner end face can be fine processed at a time when the small hole is processed, thereby ensuring the size and position tolerance of the element, eliminating one step from the process, and increasing the machining efficiency.

Description

Orientable cornish bit

Technical field

The utility model relates to the process tool of machine components, especially orientable cornish bit.

Background technology

On some machine components of processing during aperture, diameter is arranged than its big macropore below the aperture, macropore and its inner face have higher requirement for the run-out tolerance of aperture.As macropore and the inner face that just has run-out tolerance to have relatively high expectations below the guide hole of 16V240 cylinder head.Require higher valve seat orifice because have on the guide hole, so can only be earlier from top processing valve seat orifice, reprocessing guide hole with it.Macropore below the guide hole and inner face will be in another operation processing.Guarantee the macropore and inner face and the guide hole run-out tolerance that process will design high-precision anchor clamps, relatively difficulty.

Summary of the invention

The purpose of this utility model provides a kind of orientable cornish bit, is directly installed on the dynamic head main spindle.The unit head backward feed just can be macropore and its inner face of ream below guiding expands with the aperture of processing, the machining accuracy height.

The technical scheme that its technical problem that solves the utility model adopts is: knife bar directly is fixed on the dynamic head main spindle.Targeting part on the knife bar enters the appropriate location in the aperture of having processed, loads onto the cornish bit of axial location.Backward feed processes macropore and the inner face after roughing.

Orientable cornish bit is made up of cornish bit, locking handgrip and knife bar, it is characterized in that: the taper tool shanks on the knife bar is contained in the taper hole of dynamic head main spindle, the external screw thread of fixed cover is contained in the screw of main shaft on the knife bar, and the inner face of fixed cover is pressed on the shaft shoulder of cylinder below the taper tool shanks; Cornish bit is contained in by its taper hole on the cone of knife bar lower end has key to connect, and fixes with the locking handgrip, and cornish bit has the location structure of controlling the reaming ream inner face degree of depth; There is the column part that cooperates with the aperture of part processing the top of cornish bit on the knife bar.

The advantage of this orientable cornish bit is: the macropore below the part aperture and the fine finishining of inner face are finished when the processing aperture together, have promptly guaranteed the processing dimension and the position of related features of part, can reduce by a procedure again, have improved working (machining) efficiency.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further described.

Accompanying drawing is the installation diagram of orientable cornish bit.

Fig. 1 is a front view, is the A-A cutaway view of Fig. 2.

The B-B cutaway view of Fig. 2 Fig. 1.

The C-C cutaway view of Fig. 3 Fig. 2.

1. main shafts among the figure, 2. fixed cover, 3. circlip for shaft, 4. cutter hub, 5. positioning sleeve, 6. plane bearing, 7. locking nut, 8. locking handgrip, 9. circlip for hole, 10. retaining pad, 11. sealing rings, 12. keys, 13. parts, 14. knife bar bodies.

The specific embodiment

Accompanying drawing is the orientable cornish bit that processing 16V240 cylinder cover for diesel engine is used on the vertical driving force head.In the accompanying drawings, the taper tool shanks on the knife bar is contained in the taper hole of dynamic head main spindle (1), and the external screw thread of fixed cover on the knife bar (2) is contained in the screw of main shaft (1), and the inner face of fixed cover (2) is pressed on the shaft shoulder of cylinder below the taper tool shanks; Cornish bit is contained in by its taper hole on the cone of knife bar lower end has key (12) to connect, and fixing with locking handgrip (8), cornish bit has the location structure of the control reaming ream inner face degree of depth; There is the column part that cooperates with the aperture (guide hole) of part (13) (cylinder head) processing the top of cornish bit on the knife bar.

Orientable cornish bit is divided into knife bar, cornish bit and locking handgrip three parts.

Knife bar is made up of knife bar body (14), fixed cover (2), circlip for shaft (3) and key (12).The upper end of knife bar body (14) is the taper tool shanks structure that universal cutter is installed usefulness, the lower end of knife bar body (14) be with the coaxial microcephaly of taper tool shanks under cone, tapering optional 1/10.Its effect is that cornish bit and knife bar are easy for installation and axiality is high.The key (12) that is used for transmitting moment of torsion adopts interference fit to be fixed on keyway on the cone.Circlip for shaft (3) is contained in the corresponding groove of knife bar body (14), and fixed cover (2) is contained in below the taper tool shanks between the cylinder shaft shoulder and circlip for shaft (3), and certain operating range be arranged.The effect of circlip for shaft (3) is that fixed cover (2) and knife bar body (14) are linked together.When the taper shank of knife bar body (14) was contained in main shaft (1) taper hole, fixed cover (2) male end had 2～3 millimeters from main shaft (1) screw lower end, so that make the taper shank of knife bar body (14) contact good with main shaft (1) taper hole and the locking convenience.It is coaxial with taper tool shanks that knife bar body (14) is gone up the column part that cooperates with the part processing aperture.

Cornish bit is made up of cutter hub (4), positioning sleeve (5), plane bearing (6), locking nut (7), circlip for hole (9), retaining pad (10) and sealing ring (11).Cornish bit has the detent mechanism of the adjustable control ream inner face degree of depth.Positioning sleeve (5) is contained on the cutter hub (4) by plane bearing (6), the outer ring of plane bearing (6) cooperates with the endoporus of positioning sleeve (5), the inner ring of plane bearing (6) cooperates with the cylindrical of cutter hub (4) small end, sealing ring (11) is contained in the corresponding groove of positioning sleeve (5), prevents that Qie Xiao and dust from entering in the bearing.Retaining pad (10) is contained in the following with locking nut (7) locking of cutter hub (4) small end plane bearing (6) by its internal thread, and circlip for hole (9) is contained in the interior retaining of groove of positioning sleeve (5) lower end below retaining pad (10); From accompanying drawing 1 as can be seen, the degree of depth of macropore inner face is to be determined by the distance of positioning sleeve (5) upper surface to cutter hub (4) upper knife edge below smart ream part (13) aperture, and the distance between them can realize by adjusting retaining pad (10) position on cutter hub (4).In order to make retaining pad (10) rotation easily on cutter hub (4), on the cylindrical of retaining pad (10) a plurality of uniform apertures are arranged.Only passing positioning sleeve (5) could insert rotation in the aperture of retaining pad (10) with plug, therefore on the knife bar axis, fill up (10) aperture same position place with retaining, have on the cylindrical of positioning sleeve (5) and retaining pad (10) is gone up the identical uniform through hole of hole number, it is big 1 millimeter that positioning sleeve (5) is gone up the diameter that the diameter in hole goes up the hole than retaining pad (10).When retaining is filled up (10) after the position on the cutter hub (4) is determined, use locking nut (7) with its locking.The cutter hub of cornish bit (4) is welded by the body and the carbide chip of No. 45 steel, and the anterior angle of blade is 0 °, axially the relief angle (α) of blade be 10 ° radially the relief angle of blade (β) be 8 °.

Knife bar body (14) is gone up the top of cornish bit and the fit clearance of part (13) processing back aperture is 0.03～0.06 millimeter.Matching part case hardness 58～65HRC on the knife bar body (14) can adopt the technology of plating hard chromium on surface to realize.

The use of orientable cornish bit after processing the cylinder head guide hole, is contained in knife bar in the taper hole of vertical driving force head main shaft (1), and is fixing with fixed cover (2).Unit head moves downward the position that cornish bit can be installed smoothly, cornish bit is contained on the cone of knife bar microcephaly lower end fixing with locking handgrip (8).The unit head macropore of feed after to roughing that make progress carries out smart the expansion and the inner face of ream macropore.Above positioning sleeve (5), run into part (13) below, unit head stops feed, reaming ream inner face finishes.The monolateral surplus that leaves 0.2～0.3 millimeter of reaming front large hole, inner face leaves 0.1～0.2 millimeter surplus.After machining, the unit head withdrawing unloads cornish bit and knife bar.Like this, the 16V240 cylinder of diesel engine covers one group of hole of important valve guide bushing and just can finish on a procedure, can guarantee fully the hole of each size and end face thereof to the positional precision of guide hole in pattern requires.

Claims

1. orientable cornish bit, form by cornish bit, locking handgrip and knife bar, it is characterized in that: the taper tool shanks on the knife bar is contained in the taper hole of dynamic head main spindle, the external screw thread of fixed cover is contained in the screw of main shaft on the knife bar, and the inner face of fixed cover is pressed on the shaft shoulder of cylinder below the taper tool shanks; Cornish bit is contained in by its taper hole on the cone of knife bar lower end has key to connect, and fixes with the locking handgrip, and cornish bit has the location structure of controlling the reaming ream inner face degree of depth; There is the column part that cooperates with the aperture of part processing the top of cornish bit on the knife bar.

2. orientable cornish bit according to claim 1, it is characterized in that: the upper end of knife bar body is the taper tool shanks structure that universal cutter is installed usefulness, the lower end of knife bar body be with the coaxial microcephaly of taper tool shanks under cone, key adopts interference fit to be fixed in the keyway on the cone, circlip for shaft is contained in the corresponding groove of knife bar body, be fixedly set in below the taper tool shanks between the cylinder shaft shoulder and circlip for shaft, the column part that cooperates with the part processing aperture on the knife bar body is coaxial with taper tool shanks.

3. orientable cornish bit according to claim 1, it is characterized in that: positioning sleeve is contained on the cutter hub by plane bearing, the outer ring of plane bearing cooperates with the endoporus of positioning sleeve, the inner ring of plane bearing cooperates with the cylindrical of cutter hub small end, sealing ring is contained in the groove of positioning sleeve correspondence, the retaining pad is contained in the following with locking nut locking of cutter hub small end plane bearing by its internal thread, and circlip for hole is contained in the interior retaining of groove of positioning sleeve lower end below the retaining pad; On the cylindrical of retaining pad a plurality of uniform apertures are arranged, with retaining pad aperture same position place, have on the cylindrical of positioning sleeve with the retaining pad and go up the identical uniform through hole of hole number on the knife bar axis, the diameter that the diameter in hole is gone up the hole than the retaining pad on the positioning sleeve is big 1 millimeter.

4. orientable cornish bit according to claim 1 is characterized in that: on the knife bar body after the top of cornish bit and the part processing fit clearance of aperture be 0.03～0.06 millimeter, the matching part case hardness 58～65HRC on the knife bar body.