JPS6161702A - Boring head - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the manufacture of machine tools, and more particularly to the middle nine heads of duplex machine tools.

The boring head according to the invention is most commonly applied to dual machine tools of the type that automatically change cutting tools used to machine holes of different cross-sectional shapes.

[Prior art and problems]

a housing kinematically coupled to the spindle;
This housing accommodates a balance weight and a carriage carrying a mandrel for drilling, and a boring head for surface grinding is known in the art.
, Machinostjiienie Publishing, Moscow, / Riot J',
l) See ♂J).

The housing also accommodates a rod arranged coaxially with the tool and kinematically coupled to a drive for axially moving it. This rod is configured in the form of a frame that interacts with the carriage and balance weight. The carriage and balance weight are movable in opposite radial directions by means of a helical rack on the side of the rod that engages with a corresponding helical rack provided on the carriage and balance weight.The masses of the carriage and balance weight are equal; , the spiral racks are configured so that they travel an equal distance when moving in opposite directions. It is acted on by the spindle centrifugal force, and this centrifugal force also acts on the rod and produces a screw moment. This moment causes some deformation of the rod and a certain amount of play, which affects machining accuracy.

Furthermore, this center head is disadvantageous in that its TrR and size are relatively thick due to the presence of a balance weight provided in the housing and received in the special group.

Further, the center head P of the duplex machine tool, which is the prototype of the present invention, is also known. The boring head has a housing kinematically connected to the spindle, the housing housing a carriage carrying a cutting tool mandrel and having three inclined surfaces. Seven of the three inclined surfaces of this carriage cooperate with the inclined surfaces of the rod P, which is arranged coaxially inside the housing and kinematically connected to the drive for axial movement. The other two inclined surfaces of the carriage are arranged symmetrically with respect to the axis of rotation of the boring head and each cooperate with a roller, the axes of which are perpendicular to the axis of rotation of the boring head; It is fixed to the end of the fork that was fired against the friend carriage. The fork is coaxial with the housing. These rollers interact with corresponding inclined surfaces in the threads that are in the plane passing through the axis of rotation of the boring head (see USSR Inventor's Certificate No. 665, Tata Hiroshi). The carriage is moved relative to the axis of the boring head. Middle? When it rotates, centrifugal force is generated in a direction perpendicular to the axis of rotation. This far-flooding force bends the housing of the sinking head and the spindle, increasing the load on the spindle bearing. At low spindle speeds, this centrifugal force has no appreciable effect on machining accuracy.

Low spindle rotation speed means low efficiency of the machine tool.

Increasing spindle speed to increase efficiency generates centrifugal forces that bend the housing and spindle, resulting in contact deformation of the spindle bearings.

These factors affect the accuracy of the diameter of the machined hole,
The rigidity of the spindle bearing in each direction relative to the workpiece becomes non-uniform, which impairs the roundness of the machined hole.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a centering heel capable of removing loads that cause deformation of the spindle and nozzle.

[Summary and effects of the invention]

The invention has a companion housing kinematically coupled to the spindle, the housing housing a carrier (responsive to the nozzle) carrying the mandrel of the cutting tool; and in the boring head of an f-double machine tool, with a ramp coaxially disposed within the housing and kinematically connected to the drive for axial movement and cooperating with the ramp of the f-rod. a balance weight consisting of at least/pair of pins received in a through hole provided in said carriage, said through hole being symmetrically perpendicular to the axis of rotation of the middle nine heads; and the said bin provides a boring head which is kinematically connected to the rod P so as to be able to move double inside the through hole.

Preferably, said bin is kinematically connected to the rod by a helical rack provided on these pins and on opposite sides of the rod.

This type of kinematic connection is the simplest,
It is also preferred that the gear ratio of the rod-carriage interaction ramp is much lower than the gear ratio of the bin-rod interaction spiral rack. This is an essential structure for obtaining a compact boring hole because the balance weight weighs several times as much as the carriage.

The saw run weight eliminates the stress that bends the housing and spindle, significantly reduces the load on the spindle bearing, and eliminates the torsional moment acting on the rod F.
This allows an increase in spindle speed.

Unlike ordinary hollow heads, the head according to the present invention has a simple structure, is lightweight and compact. This is due to the weight of the saw run weight being reduced and the balance weight being placed inside the carriage casing. The above-mentioned advantages of the boring machine according to the invention increase the processing accuracy of the boring machine and improve its efficiency.

〔Example〕

In the following, the invention will be explained in more detail with reference to the embodiments shown in the drawings.

To explain the attached drawings, the Nakagukuheno F
has a housing /i, and this housing / has teak;
It houses the block 3 and the mandrel≠, which are rigidly fixed to each other.

Mandrel≠ is spindle! is connected to.

The housing/housing accommodates the thrust ball bearing Otsu and the pitota mandrel? ) 7 is mounted therein.

The carriage 7 accommodates a cylindrical finger 10, which has a flat surface 11, which serves as an oblique surface of said carriage 7. Furthermore, the housing accommodates the rod 12 coaxial therewith. One end of the rod l'12 is kinematically coupled to a drive device (not shown);
This causes Roso P/Y to move in the axial direction. Rod/:1. The other end forms a bevel 13 which cooperates with the bevel 11 of the carriage 7.

To eliminate play, the carriage 7 must be crimped against the nozzle. For that purpose, a hollow fork 7μ coaxial with the axially springed housing / is interposed between the housing / and the Rono P12.

End of fork/14 facing carriage 7 (Figure 2)
The shaft 15 of the roller/6 is fixed to the shaft 15 of the roller/6. The axis 15 is arranged symmetrically with respect to the axis of rotation "a" of the middle Kuchenod. The roller /l interacts with the slope /7 of the Kyarylev (Figs. 3 and ≠). The slope /7 It is arranged symmetrically with respect to the axis of rotation "a" of the boring head. These rollers /6 interact with the slope /7 along the silk in a plane passing through the axis of rotation 2a'' of the boring head.

In order to remove the loads that cause deformation of the rod 7.2 and the housing/a pair of bins/balance weights of any shape are provided. These bottles are provided in the carriage 7 and have holes in them. is located inside.

These holes /q are arranged symmetrically with respect to the axis of rotation 5a'' of the center shaft and at right angles to this axis MS a /'. The bottles/tubs are mounted in these holes/q in a double-acting manner.

A spiral rack J provided on both sides of the rod 12 adjacent to the slope 13 of the rod 12 allows the rod 12 to
The double action of the bin/column is performed synchronously. These spiral racks J mesh with spiral racks 2/ provided on the bins.

The rotation of spindle j creates a centrifugal force on carriage 7 and bottle/g. To balance these centrifugal forces,
It is necessary that the masses of the carriage 7 and the bottle/shape and the distance between their center of gravity and the axis of rotation "a" of the boring head are inversely proportional to each other. In other words, the masses of the carriage 7 and the bottle/shape There must be an inverse proportional relationship between the gear ratio of the bottle/coat and the rod/yu.The mass of the bottle/coat - is the carriage 7
This balance weight in the form of bins/g is best when there is an inverse relationship between the gear ratios.

Between the carriage and rod 12 and between the bottle/g and Rono P1
The desired gear ratio between 2 and 2 is obtained by suitably selecting the angle of inclination of the ramp 13 of the rod 12 and the angle of inclination of the teeth of the rack 20 and the rack 20. The total weight of the balance weight is divided evenly between these bins, regardless of the number of bins. The inside of the housing is covered by cover 2.
2 (FIG. 1) and protected by a guard J mounted on the carriage 7.

The boring head of this dual-action one-machine machine operates as follows. A cutting tool 7 is fixed in a mandrel groove of the boring head which is rotated by a spindle.

In the figures, the rod 12 is shown in its leftmost position.

When the boring head rotates, the rod 12 moves to the right. 2hiro Nonone drives the fork/≠ to the left (Figure ≠). The roller/6 comes into contact with the slope 17 of the carriage 7, thereby causing the carriage 7 and the mandrel to contact each other.
In this case, the spiral rack 20 of the Rono P12 drives the spiral rack 2/ of the bottle/g in the direction opposite to the direction of the carriage) 7. Therefore, the boring head of the invention is always properly balanced.

This allows the spindle movement to be increased without affecting machining accuracy.

When the mouth and door 12 move to the left, the slope /7 of the carry 7 acts on the roller /6, overcoming the resistance of the nose 2'A and driving the fork /lA to the right. In this case, the counterweight operates as described above.

[Brief explanation of drawings]

Fig. 1 is an elevational view of the boring head of the present invention, and Fig. 2 is an elevational view of the boring head of the present invention.
A cross-sectional view taken along mu's in the figure, Figure 3 is I- in Figure 2.
A cross-sectional view taken along line I, and Figure ≠ is a cross-sectional view taken along line ■-■ in Figure 3. /...housing, j...spindle, 7...carriage, ♂...mandrel, ri...bite, 11.
... slope, /; ... rod, 13 ... slope, /L-
・Fork, /6...Roller, /Za...Bin, /9
...through hole, 20, 2/...spiral rack, unit...
・Nonone, a...Rotation axis. Applicant's agent Kiyoshi Inomata f/1iJ f/li4

Claims (1)

Claims: 1. It has a housing (1) kinematically connected to the spindle (5), which housing receives a carriage (7) that is sprung against it, and which is connected to the spindle (5). 7) is,
The ramp (1) of the rod (12) carries the mandrel (8) of the cutting tool (9) and is arranged coaxially inside the housing and kinematically connected to a drive for axial movement.
3) in a dual machine tool boring head having a beveled surface (11) cooperating with at least one pair of holes (19) received in said carriage (7); It has a balance weight consisting of a pin (18),
Said through hole (19) is arranged symmetrically and at right angles to the axis of rotation (a) of the boring head and is arranged symmetrically and at right angles to the axis of rotation (a) of the boring head.
) is kinematically connected to the rod (12) so as to be able to move double inside the through hole (19). 2. The pins (18) have spiral racks (20) provided on these pins (18) and on opposite sides of the rod (12).
, 21) kinematically connected to the rod (12). 3. The interaction between the rod (12) and the carriage (7) The gear ratio of the inclined surfaces (11, 13) is the same as that of the pin (18) and the rod (1).
2) Boring head according to claim 2, characterized in that the interaction with the helical rack (20, 21) is significantly lower than the gear ratio.