WO2014001198A1

WO2014001198A1 - Deep-drilling machine, adapter and deep-drilling process

Info

Publication number: WO2014001198A1
Application number: PCT/EP2013/062916
Authority: WO
Inventors: Alfred Ostertag
Original assignee: Ferroll Gmbh
Priority date: 2012-06-25
Filing date: 2013-06-20
Publication date: 2014-01-03
Also published as: DE102012012414A1

Abstract

The invention relates to a deep-drilling machine having a workpiece holder (12) for holding a workpiece (14), a drilling tool (16) and a pressurized-fluid supply device (18), wherein the drilling tool (16) comprises a drill rod (20), an adapter (24) and a drill head (26), and wherein the adapter (24) is connected to the drill rod (20) and the drill head (26) so as to rotate therewith, has a drill-rod side facing the drill rod (20) and has a coupling side facing away from the drill rod (20). Provision is made according to the invention for the adapter to have a central pressurized-fluid duct which is connected such that it can be subjected to fluid pressure from the pressurized-fluid supply device (18) on its drill-rod side such that the fluid pressure (p) is transferable from the drill-rod side to the coupling side, and the adapter (24) has, on the coupling side, a dispensing valve which has a dispensing valve body which opens the dispensing valve by moving towards the drill-rod side.

Description

DEEP-DRILLING MACHINE, ADAPTER AND DEEP-DRILLING PROCESS

The invention relates to a deep hole drilling machine according to the preamble of claim 1 and an adapter. According to a second aspect, the invention relates to a deep drilling method.

In the production of hydraulic cylinders often combined tools are used, which can perform at least two processing steps, in particular peeling and smooth rolling. Such a combination tool is described in DD 212 450. The disadvantage of such a production is that so only continuous cylinder can be manufactured.

Stepped cylinders, ie cylinders in which two sections with different inner diameters exist, can not be manufactured with known combination tools. In this case, the operations of drilling or drilling, peeling and smooth rolling are carried out consecutively on three different machines. The disadvantage of this is that highest accuracies are difficult to achieve. From DE 1 477 144 A1 a generic deep drilling machine is known, in which a guide member is connected in the machine direction with a drilling part, which in turn is attached to a drill rod. With the described deep drilling machine subsequent smoothing is not possible with the same clamping. The invention has for its object to improve the production of non-continuous cylinders.

The invention solves the problem by a generic deep drilling machine in which the pressure fluid passage is centrally located and the adapter on the coupling side has a dispensing valve which has a dispensing valve body which opens by movement on the Bohrstangenseite to the dispensing valve. According to a second aspect, the invention solves the problem by a deep drilling method, in particular for producing a, in particular stepped, hydraulic cylinder, comprising the steps of (i) mounting a cylinder blank on a deep drilling machine according to the invention, (ii) drilling a cylinder, (iii) loosening the drill coupling a peeling tool to the adapter; actuating at least one peeling blade of the peeling tool by pressurizing the pressure fluid passage of the adapter by fluid pressure and peeling a cylinder inside of the cylinder by means of the peeling tool; - Drilled and peeled blank in the same setting.

An advantage of the invention is that a higher accuracy can be achieved. Due to the fact that the clamping no longer has to be changed, transformer errors are avoided. Although the drilling tool is less rigid due to its modular design, it has been found that this circumstance only insignificantly influences the achievable accuracy.

Another advantage is that the processing can be carried out very quickly, since a re-clamping is eliminated. In the context of the present description, a deep drilling machine is understood to mean a cutting machine tool which is designed to drill holes having an aspect ratio of at least 10 in workpieces made of metal. The aspect ratio is the quotient of the length of the hole to its diameter. Such deep drilling machines are special machines, since the deep drilling must be performed with a sufficiently high accuracy, so that in particular hydraulic cylinders can be manufactured.

The feature that the boring bar is rotationally driven is understood in particular to mean that the deep boring machine has a motor, in particular an electric motor, which is coupled to the boring bar. The drill head is understood to mean a unit of the drilling tool which can be separated from the adapter and drill rod and on which the cutting edge or the cutting edges of the drilling tool are formed. The pressurized fluid feedthrough is understood to mean a channel which is designed in particular such that a liquid with at least 50 bar can be passed through.

Under the feature that the pressure fluid passage at its Bohrstangenseite with fluid pressure from the pressurized fluid supply device is acted upon, so that the fluid pressure from the Bohrstangenseite is transferable to the coupling side, is in particular understood that by changing the pressure of the Druckfluid- supply device and the fluid pressure of the pressurized fluid is variable , It is possible, but not necessary, for the pressurized fluid to flow directly to the coupling side. But it is also possible that pressurized fluid of the Druckfluidversorgungsvorrich- device acts on a pressure transmitting device, which in turn changes the fluid pressure on the coupling side.

For example, the pressure fluid supply device is connected to one side of a piston or a diaphragm, and the pressure fluid coming from the pressure fluid supply device exerts a force on the piston. A second side of the piston or the membrane passes this force on to pressurized fluid whose fluid pressure rests against the coupling side. It is possible that the piston is designed as a pressure booster.

Because the adapter on the coupling side has a dispensing valve that has a dispensing valve body that opens to the dispensing valve by movement to the side of the drill rod, it is possible to insert a peeling tool that connects to the pressurized fluid passage in the coupled state with the adapter in that the dispensing valve body is pressed to the drill rod side. Such a peeling tool is particularly simple, so that such a peeling tool can be coupled with high process reliability.

According to a preferred embodiment, the deep drilling machine comprises a peeling tool, which, as an alternative to the drill head, has the form-fitting connection with the adapter. is bindable and has a receiving valve having a receiving valve body, wherein the receiving valve body is arranged so that and only when the peeling tool is positively connected to the adapter, the receiving valve body presses against the dispensing valve body and so the dispensing valve and the receiving valve are opened , In this way, the fluid pressure from the pressure fluid passage to the peeling tool can be transmitted and at the same time an undesirable leakage of pressurized fluid is prevented from the peeling tool. Preferably, the peeling tool has a pressure channel, which is connected to at least one piston for actuating the peeling blade, wherein the pressure fluid passage and the peeling tool, when the peeling tool is positively connected to the adapter, are pressure-tightly connected to each other, so that by pressurizing the pressurized fluid passage with pressurized fluid the paring knife can be brought into and / or out of engagement with the cylinder inner wall. In this way, the peeling tool can be actuated by the deep drilling machine, which was previously possible only when using a combination tool. In particular, the use of tools without control device (drilling tools do not need such a device), the leakage of pressurized fluid and the ingress of contaminants in the pressure channel prevented.

It is advantageous if the adapter comprises an expansion cone for locking and releasing the adapter, wherein the expansion cone is hydraulically actuated by means of a ring cylinder, and wherein the annular cylinder surrounds the pressure fluid passage radially. In this way, the adapter can be positively connected with high bending stiffness with the drill head and the peeling tool.

According to a preferred embodiment, the annular cylinder of the pressure fluid supply device via a second, separately controlled line with fluid iddruck acted upon. It is possible, but not necessary, for the ring cylinder to be connected directly to the pressurized fluid supply device. It is also possible that pressurized fluid of the pressurized fluid supply device is based on a pressure transfer Device acts, which in turn changes the fluid pressure in the annular cylinder. For example, the pressurized fluid supply device is connected to one side of a piston or a diaphragm, and the pressurized fluid coming from the pressurized fluid supply device exerts a force on the piston. A second side of the plunger or diaphragm passes this force on to pressurized fluid, the fluid pressure of which rests in the ring cylinder. It is possible that the piston is designed as a pressure booster. The force that is created by acting on the cylinder through the second control line on the piston, is needed to move the cone in the direction of the tool. This is achieved by compressing the disc springs and causes the folding of the locking elements, as shown in Figure 2b.

In a method according to the invention, cooling lubricant is preferably pressed into an annular gap between the drill rod and the cylinder inner surface. This coolant can flow, for example, through an open end of the hydraulic cylinder.

Preferably, the method is a method of making a stepped hydraulic cylinder where the drilling is boring.

In the following the invention will be explained in more detail with reference to the accompanying drawings. It shows

Figure 1 is a schematic view of a Tiefbohrma- machine according to the invention and

FIG. 2 shows an adapter according to the invention of the deep drilling machine according to FIG

1 .

Figure 2a shows the adapter of Figure 2 (upper part of the picture) completely and

FIG. 2b shows the adapter according to FIG. 2 (lower partial image) completely. FIG. 1 shows a schematic view of a device according to the invention

Deep hole drilling machine 10, which has a workpiece holder 12 for receiving a workpiece 14 in the form of a hydraulic cylinder blank, a drilling tool 16 and a pressure fluid supply device 18. The drilling tool 16 comprises a drill rod 20 which can be driven in rotation by means of a motor 22, and an adapter 24 which is non-rotatably connected to the drill rod 20, for example by means of a thread. The drilling tool 16 also has a drill head 26 on which at least one cutting edge 28 is formed and which is positively connected to the adapter 24. The drill head is configured to drill a hole having an inner diameter d ₂ 6, which belongs to a first stage of an at least two-stage hydraulic cylinder, which is produced from the workpiece 14. The second stage has an inner diameter d.

The workpiece holder 12 is guided guided on a machine bed 30 in the longitudinal direction L of a cylinder longitudinal axis and movable in the direction of an arrow P. The workpiece 14 is in this case a cylinder blank of a stepped hydraulic cylinder and has two sections of different inner diameter d. It is possible that, as shown in Figure 1, the drilling tool 16 is rotated. Alternatively or additionally, it is also possible that the workpiece 14 is rotated by means of a motor.

FIG. 2 shows the adapter 24, wherein a part-figure 2a represents the part above a longitudinal axis L and a part-figure 2b shows the area below the longitudinal axis. Part 2a shows the situation in which the adapter 24 is positively connected to the tool in the form of the drill head 26. Part 2b shows the situation in which the adapter 24 and the tool 26 are decoupled.

The adapter 24 has a boring bar side 32 and a coupling side 34 opposite the boring bar side 32. A connection thread 36 for connecting to the boring bar 20 (see FIG. Along the longitudinal axis L, the adapter 24 has a pressurized fluid passage 38, by means of which pressurized fluid 40 is conducted from the boring bar side 32 to the coupling side 34. that can. The pressurized fluid 40 passes through a pressure line 42 into the pressurized fluid passage 38.

On the coupling side 34, the pressure fluid passage 38 is closed by a dispensing valve 44, which has a dispensing valve body 46 in the form of a valve ball and an associated valve seat 48. The dispensing valve body 46 is biased by a compression spring 50 in its closed position.

In FIG. 2 b, a peeling tool 52, which is shown only in parts, is coupled to the adapter 24, wherein only one side of the peeling tool 24 has a hollow shaft taper 54. The peeling tool 52 has a receiving valve 56 which has a receiving valve body 58 in the form of a valve ball, which is biased by a compression spring 60 to a valve seat 62. The valve seat 48 of the discharge valve 44 and the valve seat 62 of the receiving valve 56 are formed so that the respective valve bodies 46, 58 project outwardly. If the peeling tool 52, as shown in Figure 2a, positively connected to the adapter 24, the two valve body 46, 58 have contact and press each other from their respective valve seats 48, 62. This creates a pressure connection between the pressure fluid passage 38 and a pressure channel 64 of the peeling tool 52 made. The pressure channel 64 is connected in a manner not shown in Figure 2 with a housed in the peeling tool, not shown piston for controlling the paring knife. If a sufficiently large fluid pressure p is present in the pressure channel 64, then depending on the embodiment of the peeling tool 52, the peeling blades are either pushed outward or retracted inwardly against a pretensioning device.

The receiving valve 56 has a seal 66, so that the pressure fluid passage 38 and the pressure channel 64 are sealed to each other outside connected to each other.

The adapter 24 includes an expansion cone 68 connected to a piston 70 is that runs in a ring cylinder 72. If the annular cylinder 72 is acted upon by pressure fluid via a pressure line 74, then it is moved against the spring force of a restoring spring 76 on the coupling side 34. As a result, at least one locking element 78 slides on the expansion cone 68. The locking element 78 is received in a recess 80 and presses in the locking position shown in part 2a the hollow shaft cone 54 against a receiving bore 82 of the adapter 24. Thus, the peeling tool 52 is positively connected to the adapter 24. Part 2b shows the situation in which the piston 70 has been displaced against the force of the return spring 76 on the coupling side 34, so that the locking member 78 is slipped on the expansion cone 68. The locking element 78 releases the previously used in the tool (boring tool, peeling tool or roller burnishing tool) for removal and thus tool change in this position. The expansion cone 68 includes a scraper 84 that is configured to scrape off any existing pressurized fluid from the pressurized fluid passage 38.

LIST OF REFERENCE NUMBERS

1 0 Deep drilling machine 52 Peeling tool

12 Workpiece holder 54 Hollow shaft cone

14 Workpiece, cylinder blank 56 Receiving valve

16 Drilling tool 58 receiving valve body

18 pressurized fluid supply device

60 compression spring

20 boring bar 62 valve seat

22 engine

64 pressure channel

24 adapters

66 seal

26 boring head 68 expansion cone

28 cutting edge

70 pistons

30 machine bed 72 ring cylinder

32 boring bar side 74 pressure line

34 coupling side 76 return spring

36 connection thread 78 locking element

38 pressure fluid passage

80 recess

40 pressurized fluid 82 receiving bore

42 Pressure line 84 Scraper

44 delivery valve

46 dispensing valve body

P arrow

48 valve seat d inner diameter

L longitudinal axis

50 compression spring

p fluid pressure

Claims

Expectations:

1 . Deep drilling machine with

(a) a workpiece holder (12) for holding a workpiece (14), (b) a drilling tool (16) and

(c) a pressurized fluid supply device (18),

(d) the drilling tool (16)

- a drill rod (20),

- an adapter (24) and

- comprises a drill head (26) and

(e) wherein the adapter (24),

- is connected in a rotationally fixed manner to the drill rod (20) and the drill head (26),

- has a boring bar side (32) facing the boring bar (20) and a coupling side (34) facing away from the boring bar (20).

characterized in that

(f) the adapter has a central pressure fluid feedthrough (38),

which is connected on its drill rod side (32) so that it can be acted upon by fluid pressure from the pressure fluid supply device (18), so that the fluid pressure (p) can be transferred from the drill rod side (32) to the coupling side (34) and

(g) the adapter (24) has a delivery valve (44) on the coupling side (34) which has a delivery valve body (46) which opens the delivery valve (44) by moving to the drill rod side (32).

2. Deep drilling machine according to claim 1, characterized by a peeling tool (52).

alternatively to the drill head (26) can be positively connected to the adapter (24) and

- has a receiving valve (56) which has a receiving valve body (58),

wherein the receiving valve body (58) is arranged so that if and only if the peeling tool (52) is positively connected the adapter (24), the receiving valve body (58) presses against the dispensing valve body (46) and so the dispensing valve (44) and the receiving valve (56) are opened.

Deep drilling machine according to one of the preceding claims, characterized in that

the peeling tool (52) has a pressure channel (64) which is connected to at least one piston or control cylinder for actuating the peeling knife, and

the pressure fluid feedthrough (38) and the peeling tool (52) are connected to one another in a pressure-tight manner when the peeling tool (52) is positively connected to the adapter (24), so that the peeling knife is pressurized by applying pressurized fluid (40) to the pressure fluid feedthrough (38). can be brought into and/or out of engagement.

Deep drilling machine according to one of the preceding claims, characterized in that the delivery valve body (46) is biased against a delivery valve seat (44) and/or the receiving valve body (58) is biased against a receiving valve seat (62).

the adapter (24) comprises an expansion cone (68) for locking and releasing a connection between the adapter (24) on the one hand and the drill head (26) and peeling tool (52) on the other hand,

wherein the expansion cone (68) can be actuated hydraulically by means of an annular cylinder (72) and

wherein the ring cylinder radially surrounds the pressure fluid feedthrough (38).

Deep drilling machine according to one of the preceding claims, characterized by an electrical control unit which is designed to

automatically detect whether the ring cylinder (72) is subjected to a switching pressure and

only when the ring cylinder (72) is not subjected to switching pressure, the pressurized fluid feedthrough (38) is subjected to a fluid pressure (p) sufficient to actuate the peeling knife.

Deep drilling machine according to one of the preceding claims, characterized by a cooling lubricant supply device which is designed to supply cooling lubricant into an annular space between the cylinder inner wall and the drill head (26).

Adapter (24), which is designed to connect to a boring bar (20) of a deep drilling machine (10).

(a) a ring cylinder (72),

(b) an expansion cone (68), which can be moved by applying pressurized fluid (40) to the ring cylinder (72), and

(c) a central pressure fluid feedthrough (38), by means of which pressure fluid (40) can be transferred from a drill rod side (32) facing the drill rod (20) to a coupling site (34) opposite the drill rod side,

(d) wherein the annular cylinder (72) radially surrounds the pressure fluid feedthrough (38).

9. Deep drilling process with the steps:

(i) clamping a cylinder blank on a deep drilling machine (10) according to one of the preceding claims,

(ii) drilling a cylinder,

(iii) releasing the drill head (26) from the adapter (24),

(iv) connecting a peeling tool (52) to the adapter (24),

(v) actuating at least one peeling knife of the peeling tool (52) by applying fluid pressure (p) to a pressurized fluid passage (38) of the adapter (24) and

(vi) peeling an inside of the cylinder using the peeling tool (52),

(vii) burnishing the inside of a cylinder using the burnishing tool (52a)

(viii) whereby the cylinder blank is drilled, peeled and burnished in the same clamping operation.