TWM643654U - Tail-mounted spindle - Google Patents

Abstract

A tail-mounted main shaft, which includes a shaft center, a sleeve, a headstock, a fixed ring and a transmission wheel. The shaft center is rotatably installed in the sleeve and axially connected with the transmission wheel. The sleeve is sleeved outside the shaft center. The shaft center can rotate the sleeve. Because of the special design of the fixed ring and the support bushing, it can effectively provide a tight press fit between the fixed ring and the headstock, provide the shaft center with a more stable rotation, reduce the rotation deflection and increase the machining accuracy and durability.

Description

Tail mounted spindle

The present model relates to a tail hanging type main shaft.

When existing metal workpieces are processed such as cutting, most of them are clamped by a clamping device to fix the workpiece. For example, please refer to FIG. In order to allow the free end 91 to maintain coaxial rotation, there is usually an external sleeve 93 outside the free end 91. The external sleeve 93 is coaxially sleeved outside the free end 91. The external sleeve 93 is combined with a machine tool (not shown in the figure) to stabilize the rotation of the free end 91.

However, the joint end 932 of the existing outer set 93 usually needs to maintain a certain degree of tolerance (for example, 4-7 bars) for the rotation stability required for processing. However, the tolerance design will cause the free end 91 of the main shaft to rotate the outer set 93 for a period of time. After a period of time, the coaxial rotation will gradually lose, resulting in the technical problem of reduced machining accuracy.

In order to solve the technical problems of reduced durability and reduced machining accuracy caused by the prior art spindle design, this creation proposes a highly stable tail-mounted spindle, which uses a flange with a supporting effect to be combined and sleeved between a headstock and a sleeve to provide support during the relative rotation of the sleeve and the headstock to avoid the technical problems of reduced precision and poor durability.

This model proposes a tail-hanging spindle, which includes a shaft center, a sleeve, a headstock, a fixed ring and a transmission wheel. Outside the sleeve, the fixed ring is fixedly combined with the sleeve, and a supporting lining is provided on a joint ring surface corresponding to the headstock, so that a slidable tight fit is formed between the fixed ring and the headstock.

With the above-mentioned technical means, because of the special design of the fixed ring and the support bushing, this creation can effectively provide the fixed ring and the headstock to form a tight press fit, provide the shaft center to rotate more stably, reduce the rotation deflection, and increase the machining accuracy and durability. In this way, this creation can effectively solve the problem of large rotation deflection caused by the extended shaft center.

10: axis

20: Sleeve

30: Headstock

32: perforation

40: fixed ring

40A: Inner sunken fixed ring

42: Combined Torus

42A: missing slot

422: ring groove

44A: Outer ring bushing

46: Support bushing

50: drive wheel

52: Outer ring surface

90: Spindle module

91: free end

92: Drive end

93: External set

932: binding end

Fig. 1 is the sectional view of the present model.

Fig. 2 is a three-dimensional view of partial components of the present invention.

Fig. 3 is a three-dimensional view of one of the spindle boxes of the present invention.

Fig. 4 is the sectional view of a fixed ring of the present invention.

Fig. 5 is a partial perspective view of the second embodiment of the present invention.

Fig. 6 is a partial sectional view of the second embodiment of the present invention.

Fig. 7 is the schematic diagram of the existing sleeve system main shaft.

Please refer to Figures 1-4, which are preferred embodiments of a tail-hanging spindle of the present invention, which is assembled in a machine tool (not shown in the figure) for clamping a workpiece and rotating the workpiece so that a tool of the machine tool (not shown in the figure) can process the workpiece. The tail hanging spindle includes a shaft 10 , a sleeve 20 , a headstock 30 , a fixing ring 40 and a transmission wheel 50 .

The shaft 10 is a hollow cylinder, which is driven to rotate about a rotation shaft. The hollow part of the shaft 10 can be used to clamp the workpiece through the clamp.

The sleeve 20 is rotatably sleeved outside the shaft 10. In this embodiment, the sleeve 20 is a tube and is sleeved on the outer surface of the shaft 10. A plurality of sets of bearings are arranged between an inner surface of the sleeve 20 opposite to the shaft 10 and the shaft 10, so that the shaft 10 can rotate to the sleeve 20.

The opposite end of the free end of the shaft 10 is axially connected with the transmission wheel 50 and is driven by the transmission wheel 50 to rotate the sleeve 20 .

The headstock 30 is a block including a perforation 32, which is partially locked to the machine tool, and the headstock 30 is coaxially sleeved on the outside of the sleeve 20 through the perforation 32 to stabilize the sleeve 20 and the shaft center 10, avoid rotational deflection, and maintain stable machining accuracy.

The fixing ring 40 is combined with the surface of the sleeve 20 adjacent to the transmission wheel 50 , which makes the sleeve 20 firmly abut against the headstock 30 .

In order to meet different processing requirements, the axis 10 may extend its length or axial displacement, resulting in more rotational deflection in the machining process, which in turn affects the machining accuracy and the durability of the spindle. In this embodiment, the fixing ring 40 and the headstock 30 correspond to a joint ring surface 42. A support bushing 46 is provided to form a slidable and tight fit between the fixing ring 40 and the headstock 30, so that when the axis 10 rotates, the deflection and damage are reduced. In order to ensure the stable rotation of the axis 10, the fixing ring 40 and A certain degree of tolerance is usually maintained between the headstocks 30 which may create technical problems affecting stability. Further, a ring groove 422 can be recessed in the coupling ring surface 42 , so that the supporting bush 46 can be stably arranged in the ring groove 422 to avoid falling off. The supporting bush 46 can further form a C-shaped ring including a sectional groove, which provides the elasticity required for press-fitting in the ring groove 422, and provides a more stable contact and abutment between the sleeve 20 and the headstock 30, increases overall stability, avoids rotational deflection, and increases machining accuracy and durability.

An outer ring surface 52 of the transmission wheel 50 can be driven by a belt or a transmission motor to drive the entire transmission wheel 50 and the shaft center 10 to rotate.

Please refer to Figures 5 and 6, which are the second preferred embodiment of the tail-mounted main shaft of the present invention, which includes a sunken fixed ring 40A locked and fixed with the sleeve 20, preferably, one of the sunken fixed rings 40A An annular groove is recessed on the surface of the outer ring for accommodating an outer ring bush 44A. The outer ring bush 44A may include a gap, and when accommodated in the annular groove, the outer diameter is slightly larger than the outer diameter of the sunken fixed ring 40A, so that the sunken fixed ring 40A and the headstock 30 form a slidable press fit. Preferably, the surface of the inner ring opposite to the ring groove is a bevel, so that when the sunken fixed ring 40A is locked to the sleeve 20 , more press-fit force is provided, so that the rotation deflection problem is greatly reduced. Further, the sunken fixed ring 40A can pass through a plurality of slots 42A in the axial direction, and the slots provide more elastic press-fit performance of the sunken fixed ring 40A.

It can be seen from the foregoing description that this invention, because of the special design of the fixing ring and the support bushing, can effectively provide the fixed ring 40 and the headstock 30 to form a tight press fit, provide the shaft 10 with a more stable rotation, reduce the rotation deflection and increase the machining accuracy and durability; thus, this invention can effectively solve the problem of large rotation deflection caused by the lengthened shaft 10.

10: axis

20: Sleeve

30: Headstock

40: fixed ring

50: drive wheel

Claims (5)

A tail-hanging spindle, which includes a shaft, a sleeve, a headstock, a fixed ring and a transmission wheel, the shaft is rotatably installed in the sleeve and axially connected with the drive wheel, the sleeve is sleeved outside the shaft, the shaft can rotate with the sleeve, wherein the headstock is sleeved outside the sleeve, the fixed ring is fixedly combined with the sleeve, and a supporting bush is provided on a joint ring surface corresponding to the headstock, so that the fixed ring and the headstock can form a slidable tight fit. According to the tail-hanging spindle described in claim 1, a ring groove is recessed on the joint ring surface, so that the support bush can be firmly arranged in the ring groove. According to the tail-hanging spindle described in claim 2, the supporting bush is in the shape of a C-shaped ring including a split groove. In the tail-mounted main shaft described in claim 1 or 2, one of the inner ring surfaces of the fixing ring is an inclined plane. According to the tail-hanging spindle described in claim 4, the axial direction of the fixing ring penetrates a plurality of slots.

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