Large-aperture adjustable flat-bottom counter bore machining U drill

Abstract

The utility model discloses a large-aperture adjustable flat-bottom counter bore machining U drill, relates to the technical field of mechanical drilling, and solves the problems of low machining speed and high machining cost when a traditional radial drilling machine is used for boring and machining a large-aperture counter bore. Comprising a drill bit body and a cutter handle, a centering bearing is arranged at the end of the drill bit body, and a pressing plate is arranged at the head of the centering bearing to fix the centering bearing at the end; blade seats are symmetrically arranged on the drill bit body, a plurality of blade grooves are formed in the ends, close to the centering bearing, of the blade seats, a blade is arranged in each blade groove, and each edge of each blade can be used in a direction-rotatable mode. The blade seats are divided into two types, one type is a triangular blade seat, and the blades arranged in the blade grooves of the blade seats are triangular; the other blade seat is a square blade seat, and the blade arranged in the blade groove is square; the centering bearing is detachably connected with the drill bit body, the blade seat is detachably connected with the drill bit body and replaced, the blade and the blade seat are detachable, and the blade seat can adjust the counter bore machining diameter size of the U drill.

Description

TECHNICAL FIELD

[0001] The utility model belongs to mechanical drilling technical field, especially relate to a big aperture adjustable flat bottom counterbore processing U drill. BACKGROUND

[0002] Counterbore is a kind of hole that is concave to the inside of object surface. Its feature is that the entrance end of hole is wide, gradually narrows to the inside, forms the shape similar to funnel or ladder. Counterbore is often used in bolt installation in connecting piece, especially when the surface of connecting part is not allowed to pass through. The cutting processing method of counterbore is usually first processing through hole, then expanding hole cutting processing into ladder or funnel shape at the end of through hole. For small-diameter counterbore, generally adopts twist drill, counterbore drill cutting processing counterbore, for large-aperture counterbore, generally adopts boring and milling cutter head cutting processing. And using traditional boring and milling cutter head processing, generally needs special boring and milling machine tool, this kind of equipment is generally more expensive, and the processing price is high, and boring and milling efficiency is low, and with the use of cutter head in long-time boring and milling processing, the front of cutter head wears more, and the consumption cost of cutter head is higher. For this reason, a big aperture adjustable flat bottom counterbore processing U drill is urgently needed, and ordinary drilling machine equipment can be used to process large-aperture flat bottom counterbore. SUMMARY

[0003] The utility model wants to solve the technical problem to provide a kind of big aperture adjustable flat bottom counterbore processing U drill, and ordinary drilling machine equipment can be used to process large-aperture flat bottom counterbore, avoid using traditional boring and milling cutter head processing counterbore, boring and milling efficiency is low, and the processing price is high, and the consumption cost of cutter head is high.

[0004] To solve the above technical problems, the technical scheme adopted by the utility model is:

[0005] A kind of big aperture adjustable flat bottom counterbore processing U drill, including drill body and tool shank, the tool shank is used to be connected with drilling machine equipment, the drill body and tool shank are connected by transmission torque key transmission;

[0006] The end of drill body is provided with centering bearing, and the head of centering bearing is provided with pressing plate, and the pressing plate is fixed on the end of drill body by pressing plate screw;Symmetrically set up blade seat on the drill body, multiple blade grooves are set up near the end of centering bearing of blade seat, and each blade groove is provided with blade respectively, and each blade edge of blade can be used in the direction of rotation.

[0007] Preferably, the insert seat is divided into two types, one is a triangular insert seat with a triangular insert fixed in the insert groove by an insert fixing screw; the other is a square insert seat with a square insert fixed in the insert groove by an insert fixing screw; the centering bearing is detachably connected with the drill body; the triangular insert seat and the square insert seat are detachably connected with the drill body and can be replaced; the triangular insert and the square insert are detachably connected with the triangular insert seat and the square insert seat respectively; the insert seat is fixed on the drill body by an insert seat fixing screw, and the position of the insert seat can be adjusted to adjust the diameter size of the counterbore processed by the U drill.

[0008] Preferably, when processing a large-diameter flat-bottom counterbore, the triangular insert seat with the triangular insert is first assembled on the drill body, and then the centering bearing is inserted into the through hole at the bottom of the counterbore; the drill body is driven by the drilling machine to coarsely process the counterbore; since the insert is triangular, the bottom of the processed counterbore is wavy; then the triangular insert seat with the triangular insert is replaced by the square insert seat with the square insert, and the drilling machine is used to continue processing the bottom of the counterbore into a flat bottom.

[0009] The utility model can achieve the following beneficial effects:

[0010] The large-diameter adjustable flat-bottom counterbore processing U drill comprises a drill body and a tool shank, the centering bearing plays a role of centering the U drill, and prevents the equipment from vibrating the drill to process the large-diameter counterbore; the connection between the centering bearing and the drill body adopts a pressing plate for fixation, the connection between the two is detachable, so the centering bearing can be replaced according to the size of the through hole; the triangular insert has strong cutting capacity and can realize rapid cutting processing of the large-diameter counterbore; the square insert has good planeness and can realize rapid cutting of the bottom of the counterbore into a flat bottom; the insert is detachably connected in the insert groove, so the insert can also be replaced, and each edge of the insert can be used again by changing the direction; through the combination of the centering bearing and the special insert, and the replaceable feature, the large-diameter flat-bottom counterbore can be processed by using an ordinary drilling machine, avoiding the use of a traditional boring and milling cutter head to process the counterbore, which has low boring and milling efficiency, high processing price and high cost of the cutter head. BRIEF DESCRIPTION OF DRAWINGS

[0011] The utility model will be further described in connection with the drawings and embodiments:

[0012] Fig. 1 It is a schematic view of the main structure of the utility model (with a triangular insert seat);

[0013] Fig. 2 It is a sectional view of the main structure of the utility model (with a triangular insert seat);

[0014] Fig. 3 It is a schematic view of the main structure of the utility model (with a square insert seat);

[0015] Fig. 4The utility model discloses a main body structure (with square tool holder) sectional view.

[0016] In the figure: drill body 1, handle 2, key 3, centering bearing 4, pressing plate 5, pressing plate screw 6, triangular tool holder 7, square tool holder 8, tool holder fixing screw 9, triangular blade 10, square blade 11, blade fixing screw 12. DETAILED DESCRIPTION

[0017] Preferred scheme as Figs. 1 to 4 As shown in the figure, a large aperture adjustable flat bottom hole processing U drill includes: for connecting with the drilling equipment to realize flat bottom hole processing, the adjustable flat bottom hole processing U drill includes: drill body 1, handle 2, the handle 2 is used to be connected with the drilling equipment, the drill body 1 and the handle 2 are connected through the transmission torque key 3.

[0018] Drill body and handle, the end of the drill body 1 is provided with the centering bearing 4, the head of the centering bearing is provided with the pressing plate 5, and the pressing plate is fixed on the end of the drill body 1 through the pressing plate screw 6;The tool holder is symmetrically provided on the drill body 1, a plurality of blade grooves are arranged on the tool holder close to the end of the centering bearing, a blade is arranged in each blade groove respectively, and each blade edge of the blade can be used in a rotating direction;The tool holder is divided into two kinds, one is triangular tool holder 7, and the triangular blade 10 is fixed in the blade groove of the triangular tool holder 7 through the blade fixing screw 12;The other is square tool holder 8, and the square blade 11 is fixed in the blade groove of the square tool holder 8 through the blade fixing screw 12;The centering bearing 4 is detachably connected with the drill body 1, the triangular tool holder 7 and the square tool holder 8 are detachably connected with the drill body 1 and can be replaced, and the triangular blade 10 and the square blade 11 are detachable with the triangular tool holder 7 and the square tool holder 8 respectively;The tool holder is fixed on the drill body 1 through the tool holder fixing screw 9, and the position of the tool holder can be adjusted to adjust the diameter size of the U drill.

[0019] The centering bearing 4 of the drill body 1 is gap-fitted with the through hole at the bottom of the counterbore.

[0020] When processing a large-aperture flat-bottom counterbore, first, the triangular tool holder 7 with the triangular blade 10 is assembled on the drill body, then the centering bearing 4 is inserted into the through hole at the bottom of the counterbore. The drill body 1 is driven through the drilling machine to coarsely process the counterbore. Since the blade is triangular, the bottom of the processed counterbore is in a wave shape. Then the triangular tool holder 7 with the triangular blade 10 is replaced by the square tool holder 8 with the square blade 11, and the drilling machine is used to process the bottom of the counterbore into a flat bottom.

[0021] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A U-drill for large-diameter adjustable flat-bottom countersinking, characterized in that: It includes a drill bit body (1) and a tool holder (2), the tool holder (2) being used to connect to a drilling machine, and the drill bit body (1) and the tool holder (2) being connected by a transmission torque key (3); The drill bit body (1) is provided with a centering bearing (4) at the end. The head of the centering bearing is provided with a pressure plate (5) which is fixed to the end of the drill bit body (1) by a pressure plate screw (6). The drill bit body (1) is provided with symmetrical blade seats. The blade seats are provided with multiple blade slots near the end of the centering bearing (4). Each blade slot is provided with a blade. Each cutting edge of the blade can be rotated for use.

2. The U-drill for large-diameter adjustable flat-bottom countersinking as described in claim 1, characterized in that: The blade holders are of two types: one is a triangular blade holder (7), in which a triangular blade (10) is fixed in the blade slot by a blade fixing screw (12); the other is a square blade holder (8), in which a square blade (11) is fixed in the blade slot by a blade fixing screw (12). The centering bearing (4) is detachably connected to the drill body (1). The triangular blade holder (7) and the square blade holder (8) are detachably connected to the drill body (1) and can be replaced. The triangular blade (10) and the square blade (11) are detachably connected to the triangular blade holder (7) and the square blade holder (8) respectively. The blade holders are fixed to the drill body (1) by blade holder fixing screws (9). Adjusting the position of the blade holders can adjust the diameter of the U-drill countersinking.

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