Hole processing machine

Abstract

Even if an opening such as a center hole is formed at the hole machining location of the workpiece, the chips will be discharged smoothly. [Solution] The hole drilling machine 11 drills a hole 1b with a drill 3a at the end of an opening 1c formed in the machined surface 1a of the workpiece 1. The first opening diameter 1e of the opening 1c is larger than the outer diameter of the drill 3a. The hole drilling machine 11 has a drill bush 21 that contacts the machined surface 1a. The drill bush 21 has a contact surface 21a that abuts against the machined surface 1a, a drill through hole 25 into which the drill 3a is inserted so as to slide against it, and an inlet portion 23 positioned between the drill through hole 25 and the contact surface 21a, whose diameter widens as it approaches the contact surface 21a. The inlet portion 23 may have a second opening diameter 21e which is greater than or equal to the first opening diameter 1e.

Description

Technical Field

[0001] The present invention relates to a hole drilling machine.

Background Art

[0002] In order to prevent the deflection of a drill during hole drilling, a machine tool having a drill bushing for guiding the drill and a box-shaped guide holder is known (Japanese Patent Laid-Open No. 8-197371).

Summary of the Invention

Problems to be Solved by the Invention

[0003] When an opening such as a center hole is formed at the hole drilling position of a workpiece, chips may clog at the boundary between the workpiece and the drill bushing. When the chips clog, the hole drilling cannot proceed normally. An object of the present invention is to smoothly discharge chips discharged from a workpiece even when an opening is formed.

Means for Solving the Problems

[0004] A first aspect of the present invention is a hole drilling machine for drilling a hole in a workpiece having a machining surface to be drilled with a drill and an opening larger than the outer diameter of the drill disposed on the machining surface, a drill bushing, a contact surface that contacts the machining surface, a drill passage hole that opens in the contact surface, penetrates the drill bushing, and is inserted so that the drill slidably contacts, an inflow portion disposed between the drill passage hole and the contact surface and having a diameter that widens as it approaches the contact surface, and having a drill bushing having the above.

[0005] The drill is, for example, a twist drill or a gun drill. The cross-sectional shape of the inflow portion is, for example, a straight conical shape or a bullet shape. The cross-section of the inflow portion gradually narrows toward the drill passage hole. The cross-sectional shape of the opening is, for example, a right circular cone or a right cylindrical shape. The main shaft may extend vertically or horizontally. [Effects of the Invention]

[0006] According to the present invention, even if an opening is formed in the workpiece, chips discharged from the workpiece can be smoothly discharged. [Brief explanation of the drawing]

[0007] [Figure 1] Cross-sectional view of Embodiment 1 of the hole drilling machine during hole drilling. [Figure 2] Enlarged cross-sectional view showing the workpiece before drilling, the drill bush, and the drill in Embodiment 1. [Figure 3] Cross-sectional view of embodiment 2 of the hole drilling machine [Modes for carrying out the invention]

[0008] <Embodiment 1> As shown in Figure 1, the drilling machine 11 of this embodiment includes a frame 13, a worktable 15, a spindle head 17, a spindle 19, a chip box 31, a drill bush 21, and a guide 37. The worktable 15 and the spindle head 17 are positioned on the frame 13. The spindle head 17 moves relative to the worktable 15. The spindle 19 is rotatably positioned on the spindle head 17. A workpiece 1 is fixed to the worktable 15. The spindle 19 is a vertical axis.

[0009] Workpiece 1 has a machined surface 1a and an opening 1c. Workpiece 1 is fixed to a worktable 15. The machined surface 1a is the surface where a hole 1b is machined by a hole drilling machine 11. The opening 1c is located on the machined surface 1a. As shown in Figure 2, the opening 1c may be a center hole. The opening 1c has a tapered surface 1d. The maximum diameter of the opening 1c is the first opening diameter 1e. The hole 1b is machined coaxially with the opening 1c.

[0010] The twist drill 3a is mounted on the spindle 19. The twist drill 3a is, for example, a coolant-through drill.

[0011] The chip box 31 has a nozzle 33, an outlet 35, a chip box hole 39, and a guide 37. The drill 3a is inserted into the chip box 31. The chip box 31 collects chips attached to the drill 3a. The nozzle 33 sprays coolant toward the drill 3a. The sprayed coolant separates the chips from the drill 3a. The outlet 35 discharges the coolant and chips to the outside. The drill 3a is inserted into the chip box hole 39. The inner diameter of the chip box hole 39 is larger than the outer diameter of the drill 3a. The guide 37 slides against the drill 3a. The guide 37 is positioned on the base end face of the chip box 31.

[0012] As shown in Figure 1, the drill bush 21 is positioned on the tip surface of the chip box 31. As shown in Figures 1 and 2, the drill bush 21 has, in order from the contact surface 21a, an inlet 23, a drill through hole 25, and an outlet 27. The drill through hole 25 slides against the side surface of the drill 3a. The contact surface 21a is positioned on the tip surface of the drill bush 21. The contact surface 21a contacts the machined surface 1a. The drill bush 21 functions as a runout stabilizer for the drill 3a.

[0013] The inlet portion 23 is positioned on the contact surface 21a. The inlet portion 23 is directly connected to the drill through hole 25. The inlet portion 23 has a tapered shape, with its cross-section narrowing from the contact surface 21a towards the drill through hole 25. The opening diameter of the inlet portion 23 (second opening diameter 21e) is greater than or equal to the first opening diameter 1e. The inlet portion 23 faces the opening 1c.

[0014] The outflow section 27 is positioned on the base end face of the drill bush 21. The outflow section 27 is connected to the drill through hole 25. The outflow section 27 has a tapered shape, with its cross-section widening towards the chip box 31. The outflow section 27 suppresses chip clogging within the drill bush 21.

[0015] The effects of this embodiment will be described. The chips cut out by the tip surface of the drill 3a are pushed out through the gap on the side circumferential surface of the drill 3a and move toward the proximal end side. The chips smoothly flow into the inflow portion 23 from the opening 1c. Clogging of chips or the like is suppressed between the opening 1c and the contact surface 21a. The chips flow into the chip box 31 from the inflow portion 23 through the drill passage hole 25.

[0016] Before and after the hole machining, the worktable 15 may be moved to separate the workpiece 1 and the drill bush 21. By separating the workpiece 1 and the drill bush 21, the loading and unloading of the workpiece 1 become easy.

[0017] <Embodiment 2> As shown in FIG. 3, a gun drill 3b is attached to the hole drilling machine 11 of this embodiment. The machining surface 101a of the workpiece 101 has an opening 101c. The opening 101c is a straight cylinder. The opening 101c is, for example, a countersink hole or an oil seal hole. The inner diameter of the opening 101c is constant. A hole 101b is machined in the workpiece 101 by the gun drill 3b. The gun drill 3b extends in the horizontal direction. The gun drill 3b has a coolant hole 3c and a discharge groove 3d. The coolant hole 3c is arranged inside the gun drill 3b and extends along the axial direction. Coolant is injected into the coolant hole 3c. The discharge groove 3d discharges the coolant and chips. The drill bush 121 has an inflow portion 123 and a drill passage hole 125 in order from the contact surface 121a.

[0018] The cross-sectional shape of the inflow portion 123 is bullet-shaped. The inflow portion 123 has a columnar portion 123b and a tapered portion 123c. The columnar portion 123b is arranged at the tip portion. The inner diameter of the columnar portion 123b is constant. The tapered portion 123c is arranged at the base end portion and is connected to the columnar portion 123b. The tapered portion 123c has a reduced cross-section toward the drill passage hole 125. The tapered portion 123c may be a straight cone shape.

[0019] The effects of this embodiment will be described. Since the columnar portion 123b is arranged, the change in the cross-sectional area from the opening 101c to the drill passage hole 125 becomes gentle. As a result, the discharge of chips becomes smooth. The coolant is jetted from the tip surface of the gun drill 3b. Chips and the like flow into the inflow portion 123 from the discharge groove 3d. Since the tapered portion 123c has a tapered cross-section that narrows, clogging of chips is suppressed.

[0020] The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the gist of the present invention. All technical matters included in the technical idea described in the claims are the subject of the present invention. The above embodiment shows a preferred example, but those skilled in the art can realize various alternative examples, modified examples, deformed examples or improved examples from the content disclosed in this specification, and these are included in the technical scope described in the appended claims.

Explanation of reference numerals

[0021] 1, 101 Workpiece 1a, 101a Machined surface 1b, 101b Hole 1c, 101c Opening 1d Tapered surface 1e First opening diameter 3a Twist drill (drill) 3b Gun drill (drill) 11 Drilling machine 21, 121 Drill bushing 21a, 121a Contact surface 2i Third opening diameter 23, 123 Inflow portion 123b Columnar portion 123c Tapered portion 25, 125 Drill passage hole 27 Outflow portion 31 Chip box

Claims

1. A hole drilling machine for drilling holes in a workpiece having a machined surface to be drilled and an opening positioned on the machined surface that is larger than the outer diameter of the drill, It is a drill bushing, A contact surface that contacts the processed surface, A drill-through hole is provided, which opens into the contact surface, penetrates the drill bush, and into which the drill is inserted so as to slide against it. An inlet portion is positioned between the drill through hole and the contact surface, and its diameter widens as it approaches the contact surface, Having a drill bush, Hole processing machine.

2. The aforementioned drill is a gun drill. The hole drilling machine according to claim 1.

3. The aforementioned inlet is a tapered hole. A hole drilling machine according to claim 1 or 2.

4. The aforementioned inlet is bullet-shaped. A hole drilling machine according to claim 1 or 2.

5. The aforementioned opening has a first opening diameter, The hole drilling machine drills a hole at the position of the opening, The inlet has a second opening diameter which is greater than or equal to the first opening diameter. A hole drilling machine according to any one of claims 1 to 4.

6. Furthermore, it has a tip box hole into which the drill can be inserted, and a tip box that connects to the drill bush, The drill bush is positioned on the opposite side of the contact surface and has an outflow portion whose diameter widens towards the chip box. A hole drilling machine according to any one of claims 1 to 5.

Images