JPH03287304A - Center for cylinder grinding machine - Google Patents

Abstract

PURPOSE:To support the center of a work (shaft) with a tip, and also to perform entire cylinder grinding of the outside diameter of the shaft without changing arrangement by providing a ring axially engaged in the recessed part of the center of a headstock and having projections, and the tip being inserted in the inside diameter side of this ring and being axially energized in the forward direction. CONSTITUTION:The center 1 for a headstock comprises a ring 4 which has a plurality of projections 4a at its end and is screwed in the internal thread formed axially in the recessed part 11 at the end of the center 1, a conical tip 2 which is inserted in the inside diameter side of this ring 4 and is axially energized in the forward direction by a spring 3. By this constitution, the center of a shaft (work) can be supported by the tip 2, and also the one end of the shaft can be fixed because of the biting of the projections 4a into the end surface of the shaft, and the other end thereof can be supported by the center of a tailstock. Thus, the grinding of the outside diameter of the shaft can be carried out without changing arrangement.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a center for a cylindrical grinding machine that performs cylindrical grinding on the outer diameter of a shaft with a narrow and short diameter.

[Conventional technology]

A cylindrical grinder is equipped with a table on a box-shaped bed that reciprocates in the vertical direction, and a grindstone head that makes cutting movements in the back and forth direction. The table has a headstock that supports the workpiece and gives it rotational motion, and a tailstock that supports the other end of the workpiece. The whetstone head has a motor that drives the whetstone wheel at high speed and a whetstone shaft. The grinding wheel shaft is supported by precision bearings, enabling high-speed precision drive of the grinding wheel. In cylindrical grinding, the workpiece is supported by both the center of the headstock and the tailstock, and the workpiece is rotated by the headstock and the grinding wheel is rotated at high speed to make a cut and perform grinding. FIG. 4 is a configuration diagram of a conventional cylindrical grinder, and FIG. 5 is a perspective view of the rotor shown in FIG. 4. 4 and 5, when grinding the outer diameter of the shaft 8 etc. with a cylindrical grinder for external grinding, a center hole is machined on both end surfaces of the shaft 8, and a second hole is formed on one end of the shaft 8.
Tighten the pin 7a of the rotary ring 7 as shown in the figure to fix the shaft 8 to the rotary ring 7, and insert the center 1 of the headstock, which is fixed to the main shaft 9 of the headstock, into the center hole at the end where the rotary ring 7 is attached. A stopper 8 is fixed to the center hole of the other end of the tailstock, which is set on a table facing the main shaft 9. A turning rod 1 attached to the main shaft 9 rotates the main shaft 9.
0, the rotary wheel 7 is turned to give rotation to the pongee 8 as a workpiece, and a grinding wheel (not shown) rotating at high speed is given a cut to perform grinding. At this time, since the turner 7 is attached around the shaft 8, it is not possible to grind the outer diameter of this part, so the turner 7 is attached to the other end of the shaft 8 in the opposite direction, and the shaft 8 is centered at both centers 1.6.
The remaining parts were ground.

[Problem to be solved by the invention]

Since it is difficult to automate the work of setting the rotor 7 on the shaft 8, it is a work to attach the rotor 7 to the pongee 8, a work to attach the rotor 7 to the opposite side of the shaft, and a work to set the rotor 7 on the shaft 8 to the grinding machine. All attachment and detachment must be done by the operator. In addition, when the rotor is completely attached, the rotor must be removed and the workpiece must be reset to the opposite end for machining a portion, which causes the problem that setup time is doubled. An object of the present invention is to provide a cylindrical grinding center that can support the shaft and rotate it nine times without using a rotary tool to grind the entire outer diameter of the shaft.

[Means to solve the problem]

The above object is to provide a cylindrical grinding machine for grinding the outer diameter of the pongee by supporting the center of the shaft to be machined by both the centers of a headstock and a tailstock. A female thread is carved in the axial direction, a ring is engaged with this female thread and has multiple sharp protrusions on the tip, and a groove is carved on the outer diameter side, and a ring is inserted into the inner diameter side of this ring. This is achieved by comprising a conical tip which is pressed against the axial tip by a spring.

[For use]

A female thread is carved in the axial direction in a recess at the tip of the center of the headstock, a ring is engaged with the female thread and has a plurality of protrusions, and the ring is inserted into the inner diameter side of the ring and is pressed against the tip in the axial direction by a spring. The center of the headstock is made up of a conical tip and the center tip supports the center of the shaft.Multiple protrusions at the tip of the ring bite into the shaft end surface to fix one side of the shaft and fix the other. The pongee is supported by the center of the tailstock and rotated by the center of the headstock, and the grindstone is applied to the outer diameter of the shaft to perform cylindrical grinding of the entire outer diameter of the ring.

【Example】

The present invention will be described in detail below based on the drawings. FIG. 1 is a partially sectional plan view of the center of a headstock for a cylindrical grinder according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view of the tip of the center in FIG. 1, and FIG. ■It is a direction arrow view. In FIGS. 1 and 2, there is a female thread carved in the axial direction in the recess 11 at the tip of the center 1 of the headstock, and three sharp protrusions 4a at the tip that are engaged with this female thread. A ring 4 with a groove carved on the side, a conical tip 2 inserted into the inner diameter side of the ring 4 and pressed to the tip in the axial direction by a spring 3, and a stopper 5 attached to the side of the tip 2. The center 1 of the headstock was constructed from the following. The tip 2 is pushed by the spring 3 and protrudes outward beyond the projection 4a of the ring, but its movement is restricted by the stopper 5 so that it does not jump out of the center. In FIG. 3, a conical tip 2 is located at the center of the center 1 of the headstock, and three protrusions 4a are arranged around the tip 2. One end of the shaft 8, which is the workpiece to be machined, is supported by the tip 2 of the center 1 of the headstock, and when the other end is pressed against the center 6 of the tailstock, the tip 2 pushes the spring 3 and the ring 4 The three protrusions 4a bite into the end face of the shaft 8 and fix the pongee 8. The center 1 of the headstock is rotated by the headstock of a cylindrical grinder to give a cut to the grinding wheel rotating at high speed, and cylindrical grinding is performed over the entire outer diameter of the shaft.

【Effect of the invention】

According to this invention, after the tip at the center of the headstock supports the center of one end surface of the shaft as a workpiece, the center of the opposite tailstock is pressed against the center of the shaft, and the center of the headstock is supported by the tip at the center of the headstock. The multiple protrusions on the tip of the ring bite into the shaft end surface to fix the shaft, and the shaft is rotated by the center of the headstock and cylindrical grinding is performed by the grinding wheel without using a turner. It is possible to grind the entire surface to the end while it is attached. Therefore, if the center according to the present invention is used, there is no need to attach and change the workpiece as in the conventional case, and the workpiece can be processed in a short time.

[Brief explanation of drawings]

FIG. 1 is a partially sectional plan view of the center of a headstock for a cylindrical grinder according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view of the tip of the center of FIG. 1, and FIG. (2) Directional view, FIG. 4 is a configuration of a conventional cylindrical grinder, and FIG. 5 is a perspective view of the rotor shown in FIG. 4. 1: Center of headstock, 2: Chip, 3: Spring, 4: Ring, 4a: Protrusion, 6: Center of tailstock, 7: Turner, 8
: shaft as workpiece, 9: main shaft, 11: recess.

Claims (1)

[Claims] 1) In a cylindrical grinder that grinds the outer diameter of the shaft by supporting the center of the shaft to be machined by both the centers of the headstock and tailstock, the center of the headstock is placed in the recess at the tip of the center. A ring that is engaged with the female thread and has multiple sharp protrusions on the tip and has a thread carved on the outer diameter side, and a spring that is inserted into the inner diameter side of this ring and that is attached to the shaft by a spring. A center for a cylindrical grinding machine characterized by comprising a conical tip that is pressed at a directional tip.