JP4915948B2 - Drilling unit - Google Patents

Abstract

Disclosed is a drilling machining unit which comprises a ball screw rod, a screw support body, a hollow punch and a core shaft; wherein, the ball screw rod is arranged in a body shell; the screw rod support body is provided with a nut part in threaded connection with the ball screw rod and is able to rotate through the shaft of the ball screw rod and have reciprocating movement along the ball screw rod; the hollow punch is fixed on the screw rod support body; the core shaft can be rotationally maintained on the front end part of the hollow punch; the body shell is provided with an opening for exposing the hollow punch and a second opening; a main shaft is detachably embedded and inserted into the back surface of the second opening in projection state opposite to the opening; the screw rod support body comprises a connection part for connecting the main shaft motor with a rotary shaft deployed in the hollow punch in run-through mode; so the rotation output can be transmitted to the core shaft; the main shaft motor comprises an embedding part for embedding the main shaft motor with the connection part detachably.

Description

  The present invention relates to a drilling unit such as an electric drill unit.

  A conventional electric drilling unit for drilling or tapping a workpiece has a spindle with a drill head attached to the tip of the spindle that is rotatably held at the front end of a cylindrical hollow ram. The spindle is moved forward and backward with respect to the workpiece by moving the ram relative to the apparatus main body.

  As such a conventional drilling unit, for example, as shown in FIG. 2 (a), a ball screw 35 disposed in the main body housing 32 so as to be rotatable is rotated by a feed shaft motor 36. There is a screw supporter 33 provided with a nut portion 34 that is screwed into a ball screw, and a hollow ram 37 whose rear end portion is fixed by a bolt 39 moves forward and backward in parallel with the ball screw 35 together with the screw supporter 33. The rotation output of the main shaft motor 38 disposed at the rear portion in the hollow ram 37 is transmitted to the spindle 41 at the front end portion through the rotation shaft disposed through the hollow ram 37.

  When the spindle motor for rotating the spindle as described above is built in the hollow ram as a built-in motor, the overall length of the drilling unit can be shortened and the stroke can be lengthened (for example, Patent Document 1, Patent Reference 2).

JP 2000-24815 A JP 2001-87918 A

  However, in the conventional built-in motor type drilling unit as described above, the spindle motor 38 is inserted into the hollow ram 37 from the rear side of the hollow ram 37, so that the maintenance efficiency is not good. Met.

  For example, when the spindle motor 38 needs to be replaced, as shown in FIG. 2B, first, the bolt 39 is released and the hollow ram 37 is removed from the screw supporter 33 and pulled out from the main body housing 32 (FIG. 2). (C)) After removing the ram connector 40 closing the rear opening of the hollow ram 37 (FIG. 2D), the spindle motor 38 is finally extracted from the hollow ram 37 (FIG. 2E). Can be replaced with other motors. Furthermore, the assembly process requires a procedure reverse to the time-consuming disassembly process as described above.

  In this way, the conventional product takes time and labor for the disassembly and assembly process, so if a spindle motor needs to be replaced, a lot of time is spent and the machine recovery is urgent. However, a large time loss is inevitable, and it can be said that the maintenance is inferior.

  In addition, it is necessary to process the cable extending from the spindle motor in the main body housing by incorporating the motor in the hollow ram, and there are many parts for processing to avoid disconnection etc. when the hollow ram moves forward and backward. This was necessary and was a factor in increasing the cost of the drilling unit itself.

  In view of the above-described problems, the object of the present invention is a drilling process that has a simple configuration with a smaller number of parts than before and can be easily disassembled and assembled for replacing the spindle motor and can improve maintenance. To provide a unit.

In order to achieve the above object, a drilling support unit according to the invention described in claim 1 is provided with a screw supporter having a nut portion that is rotatably arranged in a main body housing and is screwed to a ball screw that is axially rotated by an electric motor. A cylindrical hollow ram having a rear end fixed to the screw supporter so as to protrude outward from an opening provided on the front surface of the main body housing by reciprocating along the ball screw by rotating the ball screw. In a drilling unit that advances and retreats in an axial direction parallel to the ball screw, together with a spindle rotatably held at the front end of the hollow ram and a tool mounting head attached to the tip of the spindle,
A spindle motor for rotationally driving the spindle, and a rotating shaft coaxially and penetrated inside the hollow ram to transmit the rotational output of the spindle motor to the spindle;
The main body housing has a second opening for fitting the spindle motor in a protruding state so as to be detachable on a rear surface facing the opening,
The screw supporter includes a connecting portion for connecting the spindle motor to the rotating shaft on a back surface side of a fixing portion that fixes a rear end portion of the hollow ram,
The said spindle motor is provided with the fitting part which fits to the said connection part so that attachment or detachment is possible.

Further, in the processing unit according to claim 1 further wherein the spindle motor, which has an air supply port for taking in air from the outside to the inside of the motor at its rear end, discharge the air having passed through the internal motor An air discharge port is formed in the fitting portion,
The screw supporter has a through-hole that communicates the air discharge port with a hollow ram when the spindle motor is connected,
The hollow ram has an air introduction path for sending air sent from the spindle motor to the front end through the through hole of the screw supporter, and a plurality of air for releasing air from the air introduction path around the spindle at the front end. It has an air discharge port.

  In the drilling unit of the present invention, the screw supporter having a nut portion screwed into the ball screw in the main body housing is reciprocated along the ball screw by rotating the ball screw in the main body housing by the electric motor. A cylindrical hollow ram whose rear end is fixed to the screw supporter in a state of protruding from the front opening is moved forward and backward in parallel with the ball screw together with a spindle rotatably held at the front end. The spindle supporter is connected to a spindle motor that is fitted in a projecting manner so as to be removably inserted through a second opening on the opposite rear surface, and a rotary shaft for transmitting rotational output to a spindle that is disposed through the hollow ram. Since it is detachably connected via the part, the fitting of the spindle motor to the connecting part of the screw supporter is released. As a result, only the spindle motor can be easily removed from the second opening of the main body housing, so that the spindle motor can be replaced without the need for a time-consuming disassembly and assembly process. Holding the rear part of the spindle motor protruding from the opening, the operation can be easily performed from the outside. As a result, the work time is greatly reduced and excellent maintainability can be expected. In addition, there is no need for parts for processing the cable extending from the spindle motor in the main body housing, so the number of parts is reduced accordingly, and the overall This has the effect of significantly reducing costs.

The hole drilling unit according to the present invention is configured such that a screw supporter having a nut portion screwed into a ball screw disposed so as to be axially rotatable in the main body housing reciprocally moves along the ball screw that is axially rotated by an electric motor. A cylindrical hollow ram whose rear end is fixed to the screw supporter so as to protrude outwardly from an opening provided in the front surface of the hollow ram, a spindle rotatably held at the front end of the hollow ram, and the spindle Along with the tool mounting head attached to the tip, it moves forward and backward in the axial direction parallel to the ball screw, and a spindle motor for rotating the spindle on the rear surface facing the opening can be inserted into and removed from the main body housing. And a second opening that is fitted in a protruding state on the screw supporter, and a locking portion for fixing the rear end of the hollow ram of the screw supporter On the surface side, there is a connecting part for connecting the spindle motor to the rotating shaft coaxially arranged inside the hollow ram in order to transmit the rotational output to the spindle, and the spindle motor can be attached to and detached from the connecting part It is provided with a fitting part that fits into the box.

  Accordingly, in the present invention, the main shaft motor is connected to the rotating shaft in the hollow ram via the connecting portion of the screw supporter, and the rear portion protrudes outward from the second opening of the main body housing. The main shaft motor alone can be easily removed from the main body housing by releasing the fitting of the main shaft motor with respect to the connecting portion of the main shaft motor. Can be easily performed from the outside by holding the rear part of the spindle motor without the need for parts and labor-consuming disassembly / assembly processes, and the work time can be reduced and excellent maintainability can be expected It is.

  In addition, the connection mechanism of the screw supporter in the present invention and the fitting mechanism of the fitting portion of the spindle motor with respect to the connecting portion may be any mechanism that can be easily attached and detached by an operation from the spindle motor side. If it is a form and the fitting part is a male screw form that is screwed into this, the connection to the rotating shaft in the hollow ram is performed only by a simple process of rotating the spindle motor by operating the rear part protruding outside And can be easily removed.

  In the present invention, the spindle motor and the rotating shaft in the hollow ram are connected via a screw supporter, and the hollow ram is released from the main body as in the case where the conventional spindle motor is built in the hollow ram. The ram connector and the fixing bolt for storing and fixing the bolt member and the spindle motor that can be fixed in the hollow ram are not necessary, and there is no need for parts for processing the cable extending from the spindle motor in the main body housing. As a result, the number of parts is reduced, and the maintenance performance such as workability is improved as described above, so that the overall cost can be greatly reduced.

  Furthermore, in the configuration of the present invention, the main body motor is fitted in the main body housing in a state where the rear portion of the main shaft motor protrudes outward from the second opening in a connected state with the rotation shaft of the main shaft motor. Cooling air can be easily supplied into the motor simply by providing an air supply port at the rear end of the spindle motor without the need for troublesome piping in the housing. In addition, since the main shaft motor communicates with the hollow ram via the connecting portion of the screw supporter, the air supplied into the motor can be introduced into the hollow ram side and used here.

  That is, an air introduction path is formed in the hollow ram from the rear end portion to the spindle side of the front end portion, and a through-hole that communicates the air introduction path and the air discharge port formed in the fitting portion of the spindle motor is provided. By forming the screw supporter, the air supplied from the rear end of the spindle motor and cooled in the motor is sent to the spindle through the air introduction path in the hollow ram. If a plurality of air discharge ports are provided, the air discharged from the discharge ports can be used as a waterproof air purge for the spindle portion.

  With such an air supply mechanism, first, the cooling effect of the spindle motor can be enhanced, and the allowable range of the motor that can be used for the drilling unit can be widened by this cooling effect. Furthermore, the waterproof effect of the spindle portion can be enhanced by using the air after cooling the spindle motor as an air purge.

  A drilling unit according to an embodiment of the present invention is shown in the schematic block diagram of FIG. FIG. 1A is a partial cross-sectional side view inside the main body housing of the main unit when the main spindle motor is mounted, and FIG. 1B is a partial cross-sectional side view inside the main body housing showing the main motor being removed from the main unit.

  A drilling unit 1 according to the present embodiment includes a ball screw 9 disposed in a main body housing 2 so as to be rotatable about a shaft, a feed shaft motor 10 that is an electric motor for rotating the ball screw 9, and an upper portion screwed onto the ball screw 9. A screw supporter 3 having a nut portion 4 to be fitted and a cylindrical hollow ram 13 fixed at the rear end in a protruding state from an opening 23 formed on the front side of the main body housing 2 at the lower portion. And by rotating the ball screw 9 axially, the hollow ram 13 is integrated with the screw supporter 3 along the axial direction parallel to the ball screw 9 as the nut portion 4 reciprocates along the ball screw 9. It advances so that it may adjoin with respect to a process part, and it retracts so that it may leave | separate.

  Note that the lower end of the screw supporter 3 is fixed to a slider 11 that slides on a guide rail 12 fixed in parallel to the ball screw 9 on the inner wall surface of the main body housing 2, thereby further stabilizing the parallel movement of the hollow ram 13. I'm making things.

  The hollow ram 13 has a spindle 14 rotatably held at a front end portion, and a rotation shaft 15 for transmitting a rotation output of the spindle motor 18 to the spindle 14 is disposed in a penetrating state. A head 30 for mounting a processing tool is attached to the tip of the spindle 14.

  On the back side of the hollow ram fixing portion 5 of the screw supporter 3, a connecting portion 6 for connecting the rotary shaft 15 and the main shaft motor 18 is provided, and a lower end of the rotary shaft 15 is provided at the center of the connecting portion 6. Has penetrated. The connecting portion 6 is formed with a female screw processing portion 7 into which a male screw processing portion 19 formed as a fitting portion is screwed to the front end portion of the spindle motor 18.

  When the male screw machining portion 19 of the spindle motor 18 is screwed into the female screw machining portion 7 of the connecting portion 6 and screwed, the motor rotating shaft 20 protruding from the center of the front end portion of the spindle motor 18 is a hollow ram. The rotation output of the spindle motor 18 is transmitted to the spindle 14 via the rotary shaft 15 when the drilling unit 1 is driven, and is attached to the tip of the spindle 14 by the spindle 14. A processing tool (not shown) mounted on the head 30 is rotationally driven together with the tool mounting head 30.

  Therefore, the main shaft motor 18 is connected to the rotary shaft 15 only by rotating the main shaft motor 18 so that the male screw processing portion 19 as a fitting portion is screwed to the female screw processing portion 7 of the connecting portion 6 of the screw supporter 3. The connection and the attachment to the main body are completed, and the connection can be released and removed simply by rotating in the reverse direction.

  In the present embodiment, the main body housing 2 is formed with a second opening 24 into which the spindle motor 18 can be inserted and removed at a position facing the front opening 23 of the main body housing 2 from which the hollow ram 13 protrudes. . Since the connecting portion 6 of the screw supporter 3 is exposed in the second opening 24, the male screw as a fitting portion can be obtained simply by inserting the spindle motor 18 into the second opening 24 from the front end side. The processed part 19 can reach the connecting part 6.

  Moreover, since the main shaft motor 18 is fitted into the main body housing 2 in a state of protruding from the second opening 24, the mounting operation can be performed to the end while holding the rear portion of the main shaft motor 18, and the main shaft When the motor 18 is removed, the female screw of the connecting portion 6 of the fitting portion (male thread machining portion) 19 of the main shaft motor 18 is provided only by rotating the main shaft motor 18 in the reverse direction with the rear portion protruding outside the main body housing 2. The screwing with respect to the processing portion 7 can be released and the machined portion 2 can be extracted.

  As described above, in the drilling unit 1 according to the present embodiment, when the spindle motor 18 needs to be replaced, only the spindle motor 18 can be removed without requiring many disassembly / assembly processes. The mounting can be performed easily and in a short time by an operation from the outside of the main body housing 2.

  In addition, since the spindle motor 18 is in a state in which the rear portion protrudes from the main body housing 2 in the state of being incorporated into the drilling unit 1, the spindle motor 18 is externally provided only by providing the air supply port 21 at the rear end. The cooling air can be easily supplied to the inside of the 18. That is, the cooling effect on the spindle motor 18 can be easily enhanced without the need for troublesome piping in the main body housing 2.

  Furthermore, in this embodiment, the spindle motor 18 is connected to the hollow ram 13 via the connecting portion 6 of the screw supporter 3, and the air supplied into the spindle motor 18 is further supplied to the hollow ram. 13 is used as an air purge around the spindle 14.

  In other words, the air discharge port 22 is provided in the fitting portion at the front end portion of the spindle motor 18, and the air discharge port 22 is connected to the hollow ram 13 when the connection / fitting of the spindle motor 18 to the screw supporter 3 by screwing is completed. A through-hole 8 was formed in the screw supporter 3. In the hollow ram 13, an air introduction path 16 communicating with the through-hole 8 is provided from the rear end portion to the front end portion, and the air introduction path 16 has a plurality of air discharge ports 17 formed around the spindle 14 at the front end portion. Communicated with.

  Therefore, the air supplied from the air supply port 21 provided at the rear end of the spindle motor 18 and discharged from the air discharge port 22 at the front end after cooling the inside of the motor passes through the through-hole 8 of the screw supporter 3. To the air introduction path 16 in the hollow ram 13, sent to the front end of the hollow ram through the air introduction path 16, discharged from the plurality of air discharge ports 17 around the spindle 14, and used for waterproofing the spindle portion. Functions as an air purge.

It is a schematic block diagram which shows the inside of the main body housing of the drilling unit by one Example of this invention, (a) is a partial cross section side view in a spindle motor installation state, (b) is a partial cross section side view which shows a spindle motor removal state It is a figure It is a general | schematic fragmentary sectional side view which shows an example of the conventional drilling unit, (a)-(e) is explanatory drawing which shows each process of the decomposition | disassembly process for detaching a spindle motor, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,31: Drilling unit 2,32: Main body housing 3,33: Screw supporter 4,34: Nut part 5: Fixing part 6: Connecting part 7: Female thread processing part 8: Through hole 9,35: Ball screw 10 , 36: Feed shaft motor 11: Slider 12: Guide rail 13, 37: Hollow ram 14, 41: Spindle 15: Rotating shaft 16: Air introduction path 17: Air discharge port 18, 38: Spindle motor 19: Male thread machining section (Fitting portion)
20: Motor rotating shaft 21: Air supply port 22: Air discharge port 30: Tool mounting head 39: Bolt 40: Ram connector

Claims (1)

A screw supporter having a nut portion that is rotatably arranged in the main body housing and is screwed into a ball screw that is rotated by an electric motor reciprocates along the ball screw by the axial rotation of the ball screw. A cylindrical hollow ram, the rear end of which is fixed to the screw supporter so as to protrude from the provided opening to the outside, is attached to the spindle rotatably held at the front end of the hollow ram and the tip of the spindle. In the drilling unit that moves forward and backward in the axial direction parallel to the ball screw together with the attached tool mounting head,
A spindle motor for rotationally driving the spindle, and a rotating shaft coaxially and penetrated inside the hollow ram to transmit the rotational output of the spindle motor to the spindle;
The main body housing has a second opening for fitting the spindle motor in a protruding state so as to be detachable on a rear surface facing the opening,
The screw supporter includes a connecting portion for connecting the spindle motor to the rotating shaft on a back surface side of a fixing portion that fixes a rear end portion of the hollow ram,
The spindle motor includes a fitting portion that is detachably fitted to the connecting portion ,
Furthermore, the spindle motor has an air supply port for taking air into the motor from the outside at the rear end portion, and an air discharge port for discharging the air that has passed through the motor is formed in the fitting portion. Has been
The screw supporter has a through-hole that communicates the air discharge port with a hollow ram when the spindle motor is connected ,
The hollow ram has an air introduction path for sending air sent from the spindle motor to the front end through the through hole of the screw supporter, and a plurality of air for releasing air from the air introduction path around the spindle at the front end. A drilling unit having an air discharge port .

Images