Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
  • B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
  • B23Q1/72—Auxiliary arrangements; Interconnections between auxiliary tables and movable machine elements
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23B—TURNING; BORING
  • B23B41/00—Boring or drilling machines or devices specially adapted for particular work; Accessories specially adapted therefor
  • B23B41/02—Boring or drilling machines or devices specially adapted for particular work; Accessories specially adapted therefor for boring deep holes; Trepanning, e.g. of gun or rifle barrels

Definitions

• the invention relates to a feed device of the type specified in the preamble of claim 1.
• the guide carriage which is advanced by this feed device and supports the end of the workpiece, supplies the workpiece bore with drilling oil which flows between the inner wall of the bore and the shaft of the drill into the borehole to the cutting edges of the drill flows, the chips are washed away and flows through the hollow drill to the drilling slide and is discharged there.
• the guide carriage In order to prevent a leak occurring in the workpiece between the guide carriage and the mouth of the borehole through which drilling oil is lost, the guide carriage must be pressed against the end of the workpiece. So that this pressing force does not deform the workpiece, it must be dimensioned precisely. So far, it has been common to drive the slide with its own feed motor.
• the feed gear which is driven by this motor and is arranged on the guide carriage, and which has to produce a feed force which is to be measured precisely, is quite complicated.
• the invention has for its object to simplify the guide carriage by eliminating this feed motor with gear.
• Fig. 2 is a vertical middle longitudinal section through the three carriages shown on the right in Fig. 1, and
• FIG. 3 shows a slide designed on a larger scale along the line 3-3 of FIG. 1.
• the horizontal deep drilling machine shown in FIG. 1 carries on its bed 10 a headstock 12 which is provided with a drive motor 14 and which rotates the workpiece, not shown, about the spindle axis.
• Spindle 12 carried chuck 16 is clamped, is supported at its other end on a mouthpiece 18 which is rotatably mounted about the spindle axis in a guide carriage 20 and is supplied with drilling oil from a drilling oil assembly 22. This is introduced through the mouthpiece 18 into the borehole of the workpiece and flows there into a space between the inner wall of the borehole and the drill up to its cutting head, in order to cool the cutting edges there and to wash away the chips.
• the drilling oil then does not flow through the one in FIG. 1 Hollow drill shown to the drill carriage 25 carrying this drill. Between its ends, the workpiece can be supported by a roller setting stick 27. This and the slide 20 and 25 slide on the horizontal guideway of the bed 10. The drilling slide 25 is driven by its own feed motor with gear.
• the feed of the guide carriage 20 must be designed in such a way that it can press the mouthpiece 18 against the workpiece with a certain force which is sufficient to bring about a reliable seal, but which must not be so large that it causes a harmful deformation of the workpiece .
• the guide carriage 20 is advanced until it rests against the end of the workpiece and then stopped, while the drill carriage 25 carrying the drill advances driven by its feed motor and drives the drill into the workpiece.
• the guide carriage 20 can be driven by a resilient linkage which couples it to the drilling carriage 25 and is shown in FIG. 2.
• this resilient linkage consists of a horizontal push rod 28 arranged in the vertical longitudinal center plane of the bed, which is displaceably guided in the drilling carriage 25 and coupled to it by a spring.
• the drilling carriage 25 has three transverse ribs 30, 32 and 34 on its underside, which are provided with coaxial bores.
• the rod 28 is guided with a sliding fit in these bores. It carries between the ribs 30 and 32 a collar 36 rigidly attached to it, on which helical compression springs 37 and 38 are supported. These surround the rod 28 and are supported with their facing away from each other Ends at the ribs 30 and 32.
• An auxiliary slide 40 is guided on the bed between the drilling slide 25 and the guide slide 20 and is connected to the guide slide 20 by a spring 42.
• This auxiliary slide 40 can optionally be clamped to the bed 10 or to the linkage 28 carried by the drilling slide 25.
• the carriage 40 namely carries on its underside clamping plates 44 which are supported on the one hand on the carriage 40 and on the other hand each on a shoulder 46 of the bed 10 and are carried by vertical bolts 48. These bolts are guided in vertical bores of the carriage 40 with clearance and their heads are supported on spring assemblies 50 which are arranged in the enlarged upper ends of the bores and have a prestress by which the clamping plates 44 are pressed against the shoulders 46 of the bed and thereby clamp the auxiliary carriage 40.
• each clamping plate 44 there is a cylinder bore open at the bottom in the carriage 40 for receiving a hydraulic piston 52 which is supported on the clamping plate 44 at the top. If a hydraulic pressure medium is supplied to this cylinder bore by a hydraulic control (not shown in any more detail), then the piston 52 is pressed down and pivots the plate 44 located beneath it such that it is lifted off the shoulder 46 of the bed.
• the auxiliary carriage 40 has in its vertical central longitudinal plane a bore for guiding the rod 28 and carries clamping jaws, not shown, which are pressed against the rod 28 by spring force, but can be released by hydraulic pressure with the aid of the control mentioned.
• the mode of operation is as follows: If the workpiece is clamped in the chuck 16 and precisely aligned between its ends by a roller setting block 27, while the drilling carriage 25 and the auxiliary carriage 40 with the carriage 20 are withdrawn to the right, then the drilling carriage 25 is left with the on it advance the fastened drill towards the workpiece. He takes the rod 28 with the spring 37, which is clamped to the auxiliary carriage 40 during this advance. Therefore, the auxiliary carriage 40 is also carried along by the drilling carriage. He in turn takes the guide carriage 20 by means of the spring 42 until its mouthpiece 18 hits the workpiece. As a result, the guide carriage 20 is then brought to a standstill while the two carriages 25 and 40 initially advance further by compressing the springs 37 and 42.
• a measuring mechanism (not shown in more detail) is now provided, which measures this distance and, when a certain minimum dimension is reached, that is to say when the contact force increases to a certain size, the hydraulic control starts and causes at the same time to release the clamp provided on the auxiliary slide 40 for the rod 28 and to relieve the hydraulic pistons 52 of the liquid pressure. At this time, the auxiliary carriage 40 is therefore detached from the rod 28 and clamped on the bed 10 at the same time. If the release of the clamping jaws from the rod 28 is delayed, then the rod 28 is temporarily held thereby, but the feed of the carriage 25 is not disturbed because the spring 37 is further compressed.
• the force with which the. Guide carriage 20 presses the mouthpiece 18 against the workpiece grows with increasing bias of the spring 42.
• this bias depends on how much time between the impact. fen of the mouthpiece 18 on the workpiece and the clamping of the auxiliary carriage 40 on the bed 10 passes. You can therefore choose this preload and with it the contact pressure in advance.
• the described embodiment can be modified in many ways. So there is the possibility of rigidly attaching the rod 28 to the carriage 40 and replacing the collar 36 by a ring which can be displaced on the rod 28 and which can be coupled to the rod 28 by a controlled clamp.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Drilling And Boring (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6070684

Family Applications (1)

Country Status (4)

Cited By (1)

Families Citing this family (8)

Citations (2)

Family Cites Families (4)

• 1979
  • 1979-05-14 DE DE2919376A patent/DE2919376B2/de not_active Withdrawn
• 1980
  • 1980-05-12 WO PCT/DE1980/000063 patent/WO1980002522A1/de unknown
  • 1980-05-12 JP JP55501181A patent/JPS5837084B2/ja not_active Expired
  • 1980-05-14 IT IT22055/80A patent/IT1131490B/it active

Patent Citations (2)

Also Published As

Similar Documents

Legal Events