JPS58205623A - Method for spinning work - Google Patents

Abstract

PURPOSE:To improve dimensional accuracy of products by holding a plank holder having diameter equal to the bottom face of a plank against the bottom face of the concave side of the plank after forming the vicinity of central part of the plank. CONSTITUTION:A plank 3 is held between a main shaft 6 and a tail stock. While rotating the plank 3, the plank 3 is held between a working roller 8 and a holding roller 9, and the rollers 8, 9 are moved in oblique direction. When working of the plank 3 is progressed in this way and the holding roller 9 advances to a position in radial direction where it does not interfer with the plnak holder, a plank holder 7 having contacting face equal in diameter with the bottom face of the plank 3 is pressed against the bottom face of the plank 3. By this way, working is progressed by holding the plank 3 between the plank holder 7 and tail stock.

Description

[Detailed description of the invention] This invention relates to a spinning method.

Conventionally, when molding a rotationally symmetrical vessel-shaped product as shown in FIG. 3, the spinning method shown in FIGS. 1 and 2 has been employed. That is, the cylindrical blank 3 is held and rotated between the main shaft l and the tail stock 2, and the receiver holds the blank 3 between the row 94 and the processed loaf 5, while
Shaping is carried out by moving these lobes 4.5 in an oblique direction. However, since the loaf 4 of the receiver enters the concave side of the blank 3, it is necessary to avoid interference, so the diameter of the portion 11 of the blank receiver of the main shaft l cannot be increased. Ninth, as shown in Figure 3, in the case of a product where the diameter D of the bottom part is smaller than the diameter D2 of the opening part, the blank holder has a small part 1a, so the runout of the blank 30 rotations during machining is large. Therefore, there was a problem that the dimensional accuracy of the product suddenly increased.

Therefore, an object of the present invention is to provide a spinning processing method that can eliminate blank rotation and obtain good dimensional accuracy even in the case of a product whose bottom diameter is smaller than the opening diameter. It is to be.

An embodiment of this invention is shown in FIGS. 4 and 5. In the figure, 6 is a main shaft, and 11 is a chain stock that holds the blank 3 in relation to the main shaft 6. The main shaft 6 has a main bearing portion 61 with an enlarged diameter at its tip, and an auxiliary sleeve-shaped blank receiver 7 is fitted onto the outer periphery of the main bearing portion 61 so as to be movable in the axial direction. 8 is a processing lobe which is a processing member, and 9 is a receiver which is a member.

With such a device, the blank 3 is moved to the main shaft 6 as shown in Fig. 4.
While rotating the blank 3 by holding it between the and tail stock 7', the machining low'pB and the receiver are rotating the blank 3 with the lobe 9.
tl-Pinch these lobes 8.9 diagonally $IE
! Let me do it. In this way, processing of blank 3 progresses, and the receiver is low'? When the blank receiver 9 advances to a radial position where it does not interfere with the blank receiver 7, the blank receiver 7 is advanced to press the blank receiver 7 against the bottom surface of the blank 3 as shown in FIG.

The diameter of the blank abutting surface of the blank receiver 7 is approximately the same as the bottom surface of the blank 3. In this way, processing proceeds while the blank 3 is held between the blank receiver 7 and the tail stock 7'. In this way, since processing is performed while holding the blank 3 with the wide-sided blank receiver 7, the rotational runout of the blank 3 is reduced and the dimensional accuracy of the product is improved.

6 and 7 show other embodiments. In this example, a presser pin 10 is provided at the tip of the main shaft 6'.
The blank holder of the main shaft 6' holds the blank 3 by sandwiching the blank 3 between the flange part and the main shaft 6'. The diameter is approximately equal to the diameter of the bottom portion of the blank 3 when it becomes a product.

In this case, first, as shown in Figure @6, the tail stock 7' is released and the machining roller 8 and receiver proceed with machining at low F9 in a good condition. These lobes 8.9 travel in a direction opposite to the main axis 6'. In this way, when the receiver advances to a radial position where the roller 9 does not interfere with the tailstock 7', the tailstock 7' is pressed against the blank 3 to proceed with machining. In this way, since a wide area of the tail stock 7' is pressed against the blank 30, the blank 30 is less distorted and the dimensional accuracy of the product is improved. The rest is the same as the first embodiment.

Furthermore, I! iI In the example described above, the hydraulic loaf 8 and the receiver loaf 9 were used, but instead of these, a non-rotating processed member and a receiver member may be used.

As described above, in the spinning processing method of the present invention, after forming near the center of the blank, processing proceeds by pressing a blank supporter with a diameter substantially equal to the bottom surface of the concave side of the blank. Because of this, the blank can be held by the wide area of the blank holder without interfering with the workpiece, which reduces blank deflection during processing and improves the dimensional accuracy of the product. It has the effect of becoming.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of the processing process according to the conventional method, Fig. 2 is a partially cutaway side view of the state as the processing progresses, Fig. 3 is a sectional view of the product, and Fig. 4 is a part of the process according to the present invention. A partially broken 11411 side view of the embodiment, FIG. 5 is a partially broken side view of the processing progress state, FIG. 6 is a partially broken side view of another embodiment, and FIG.
The figure is a partially cutaway side view of the process in progress. 3... Blank, 6... Main shaft, 7... Blank holder, 7'... Tail stock (blank holder), 8...
...Processing lobe (processing member), 9...The receiver is the lobe (the receiver is the member), 10...Presser bin Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Procedure Written amendment (spontaneous) July 9, 1981 Relationship to the case of the person amending the name of the invention for spinning processing method Applicant address 1048 Kadoma, Kadoma City, Osaka Prefecture Name (
583) Matsushita Electric Works Co., Ltd. Representative Ikuyo Kobayashi, Date of amended order, April 1, Showa
11 Voluntary amendment, hli original target specification and drawings, contents of amendment

Claims (1)

[Claims] A plate-shaped blank is held and rotated by the main shaft, this blank is held between a member and a workpiece, and these supports advance the workpiece and workpiece obliquely outward with respect to the main shaft. A spinning processing method for forming an IB blank into a vessel shape, wherein after forming near the center of the blank, a bottom surface on the concave side of the blank has an abutment surface with a diameter substantially equal to the bottom surface. and 1ItITE3 A spinning processing method characterized in that processing is proceeded by pressing against a blank receiver that is rotatable coaxially with the main shaft.