DD291499B5 - Arrangement for the semi-automatic supply and removal of ring-shaped workpieces - Google Patents

Description

AusführungsbelspiGl

The invention will be explained in more detail below using an exemplary embodiment, the accompanying drawings show

Fig. 1: a side view of the arrangement according to the invention

Fig. 2 is a plan view of the arrangement in section

3 shows a section through the drive for the additional, pivotable arm.

On a machine table 1 an external cylindrical grinding machine is located opposite a grinding wheel 2, a headstock 3, which receives a spindle 4 and a drive 5 for the radially pivotable loading arm 6. At the free end of the pivotable loading arm 6, an axially displaceable rod 7 is provided, which carries at the front end an adjustable in outer diameter driving star 8 for the entrainment of a workpiece 9. The driving star 8 is adjusted in accordance with the inner diameter of the workpiece 9 so that it can be inserted without tension in the bore of the workpiece 9 and during grinding of the outer diameter, supported in the Gleitschuhaufnahme, can remain in the workpiece 9, d. h "that the maximum allowance dabsi to be abraded must be taken into account. At the free end of the load arm 6, a receiving basket 11 formed from webs 10 and 10.1 is replaceably secured on the plan side since it must be adapted to the outside diameter of the workpiece 9. The rod 7 protrudes through the bottom 11.1 of the basket 11 therethrough. The webs 10,10.1 are L-shaped and serve a lateral abutment of the workpiece to be transported 9. Two of these webs 10.1 are additionally designed with an axial extension 1.2, which serve as a support for the workpiece 9 in the loading position of the loading arm 6. On the spindle 4, a hydraulic Urehfeder in the form of a continuously applied rotary piston 12 is arranged next to the loading arm 6. The rotary piston 13 is positively connected via a feather key 13.1 with the spindle 4. On the housing 14 of the rotary piston 12, an arm 15 is attached, at its front end a holding plate 16 is provided for the lateral fixation of the workpiece 9 during the feeding process. When semiautomatic feeding an annular workpiece, the following sequence is recorded: In the starting position I, the loading arm 6, together with the arm 15 and the holding plate 16 attached thereto have been swung out of the machine cover 17. At the same time, the rod 7 was so withdrawn together with the driving star 8 attached thereto that the driving star 8 is in the receiving basket 11. Once this position has been reached, a workpiece 9 can now be manually inserted on the two webs 10 provided with axial extensions 10.2, which form a prism. By a manually triggered start pulse, the automatic feed begins by the driving star 8 is pushed by the mechanical displacement of the rod 7 in the bore of the inserted workpiece 9. After this operation, the loading arm 6 and the arm 15 is pivoted with the support plate 16 in the position Il by the spindle 4. In this process, the workpiece 9 is held by the driving star located in the bore 8 and is laterally fixed by the webs 10.1 and on the opposite side by the support plate 16. If the position is reached Il (preferably vertical position of the arms 6,15) comes the holding plate 16 on the end face of a slide 18 to the plant, wherein the slide 18 is fixed to a workpiece headstock, not shown. By touching the retaining plate 16 with the slide 18 it comes to a standstill of the arm 15 while continuing to move the loading arm 6 and take over the lateral fixation of the workpiece 9 through the slide plate 18 to achieve the position III (working position). With the help of acting as a torsion spring rotary piston 12, the arm 15 is held in the position II or the support plate 16 is constantly printed against the end face of the slide 18. In position III, the workpiece 9 is located with its outer diameter on the sliding shoes and is rotatably driven by the provided with a magnetic feed workpiece spindle and processed by means of the grinding wheel.

If the grinding process has ended and the grinding body 2 has been moved back from the workpiece 9, the loading arm 6 automatically pivots from the position III via the position II to the position I, while the arm 15 is moved along with its holding plate 16 again when passing the position II, wherein the holding plate 16 takes over the lateral fixation of the workpiece 9 of the slide plate 18 again. In position I, the workpiece 9 is again removed and stored by hand by the machine operator and an unprocessed workpiece 9 can be inserted by hand.

Claims (2)

Arrangement for semiautomatic feeding of annular workpieces on vol'verkleideten machine tools using a radially pivotable by means of a spindle loading arm, which is equipped with an axially displaceable driving star for receiving an annular workpiece in its bore, characterized in that in addition to the by a spindle ( 4) radially pivotable loading arm (6) another, on the same spindle (4) arranged arm (15) is provided, which at its end with a holding plate (16) for the lateral fixing eincc workpiece (9), is fitted, and that for the realization of a partially synchronous pivotal movement of the arm (15) with the loading arm (6) of a on the spindle (4) fixed rotary piston drive (12) is provided which acts as a torsion spring between the spindle (4) and the arm (15) , For this 2 pages drawings Field of application of the invention The arrangement according to the invention is intended for semiautomatic feeding and discharging of annular workpieces on fully enclosed machine tools, in particular external cylindrical grinding machines, which work in the piercing process and are equipped with sliding shoes for receiving annular workpieces of various shapes during the grinding process. The arrangement is particularly advantageous where annular workpieces of larger dimensions are to be machined, which are manufactured in series with relatively small numbers and a fully automatic machine is unprofitable due to high conversion costs. Characteristic of the known technical solutions To the arrangements shown in the DD brochures KB 6573, KB 4943 and KB 4954 for the semi-automatic supply and removal of annular workpieces, so-called loading aids for Wälzlagerschleifmaschinen, the workpiece with the aid of a clamping device which engages in the Boiirung of the workpiece with a connected radially einschwenkbaren loading arm. This embodiment has the disadvantage that the radially acting clamping forces during workpiece transport can cause a deformation of the workpiece, whereby the quality is adversely affected especially for workpieces with low wall thickness. To remedy this disadvantage, solutions are known from the DD brochures KB 4943 and KB 4954, in which the workpiece was not clamped from the inside, but the entrainment of the workpiece was carried out by a driving star, which was smaller in its outer diameter than the bore of the workpiece. However, this design required a lateral slideway over the entire pivoting range of the loading arm to avoid lateral slipping of the workpiece. There led to a considerable Unfaligefahr, the pivotal movement of the loading arm had to be initiated and carried out werdon by means of a two-handed operation for safety reasons. However, this measure again had such disadvantages as cumbersome operation for the machine operator, no protection for third persons who are on the machine. Object of the invention The semi-automatic supply and removal of annular workpieces on external cylindrical grinding machines of the type mentioned is to be designed so that a more effective supply and discharge is ensured and there is no risk of accidents. Explanation of the essence of the invention The object of the invention is to provide an arrangement for semi-automatic supply and removal of annular workpieces so that no deformation of the workpieces can occur regardless of their wall thickness and any risk of accidents is eliminated by eliminating the previous shearing while saving a portion of the lateral sliding surfaces , According to the invention the object is achieved in that in addition to the radially pivotable by a spindle loading arm, another, arranged on the same spindle arm is vorp ° - ., Is, which is equipped at its end with a holding plate for the lateral fixing of a workpiece, and that for the realization of a partially synchronous pivotal movement of the arm with the loading arm a spindle-mounted rotary piston drive is provided which acts as a torsion spring between the spindle and the arm.