JPS5966980A - Holding device of cylindrical member - Google Patents

Abstract

PURPOSE:To obtain a titled device which reduces a gap between collets and holds and detaches satisfactorily a cylindrical member by constituting so that plural collets divided into the radial direction by a dividing face inclined in the axial direction can be moved in the diameter direction and the axial direction. CONSTITUTION:In a holding device 30 of a cylindrical member, which is provided with a holding body 32 of a hollow shaft 31, a supporting body 33, a collet 41 which can move as a T-type block 37 moves, a cover plate for supporting a collet base 45, etc., the collet base 45 and the collet 41 connected with it through a pin 47 are moved in the axial direction by moving the T-type block 37 connected to a core shaft 34 fitted to a driving mechanism (omitted in the figure) by a connecting member 38 and a pivotally supporting pin 39, in the axial direction, by which the cylindrical member is held and detached. Also, a dividing face 48 of the collet 41 and the collet base 45 is inclined in the axial direction, and also the collet 41 is made movable in the axial direction by a component of force when the diameter of the collet base 45 is reduced, by which the holding device 30 is detached easily.

Description

DETAILED DESCRIPTION OF THE INVENTION - The present invention relates to a timekeeping jet for a cylindrical member suitable for holding a cylindrical member.

There are various kinds of the above-mentioned circular bell parts, such as high pressure vessels, storage vessels, reaction vessels, combustion vessels, their slender cylindrical casings, and pipe materials. . Figure 1 shows the rocket motor case.
This rocket motor case 1 has a thick-walled flange 3 having a female threaded portion a connected to one end of a combustion cavity 2 via a weld 4, and a A thick-walled flange 5 different from the above is joined via a welded portion 6,
A rocket motor end plate member 7 is screwed and fixed to the thick-walled flange 6, and a rocket motor nozzle member 9 is connected to the thick-walled flange 5 via a key member 8.

In order to manufacture the rocket motor case 1 having such a structure, the combustion cavity 2 and the two thin flanges 3 and 5 are butted together and welded together. 4,6
However, during welding, it is necessary to hold the combustion cavity 2 and both thick-walled flanges 6.5 in abutted state.

FIGS. 2 to 5 are views showing an example of a conventional device for holding the combustion cavity portion 2, which is the cylindrical member, and both half-thickness flanges 6.5, and this holding device 10, A hollow shaft holder 12 for holding the hollow shaft 11 in a predetermined position is attached to the middle part of the hollow shaft 11, and a support 16 is fixed to the end. . Then, the core 111i+ 14 connected to the drive mechanism (not shown may be manual) inside the hollow shaft 11 is connected to the core 111i+14.
I'm there. Further, an 'r-shaped block guide member 15 is fixed to the outer peripheral portion of the hollow shaft 11 with screws 16, so that four T-shaped blocks 17 can be slid in the axial direction along this guide member 15.

These four 'rH, IJ-blocks 17 each have an inclined surface 17a, and are fixed to the end of the core shaft 14 and are connected to protrude outside from a long hole 11a formed in the hollow shaft 11. They are each connected to the member 18 via a pivot pin 19, and can be slid in the axial direction together with the core shaft 14 (b).

Each of the T-shaped blocks 17 has 'r-shaped grooves 21a formed in each of the four split collets 21 divided in the radial direction.
loosely fit into both sides of each split collet 21 (1111 side
Mold block guide (back plate 22.2 fixed to $ material 15
3 prevents each split collet 21 from moving in the axial direction, and the axial movement of the T-shaped block 17 causes each split collet 21 to move only in the radial direction.

When holding the combustion cavity 2 and the thick-walled flange 6 (or 5) against each other using such a holding device 1o, the combustion cavity 2 is placed in the outer groove 21b of each split collet 21. and thick flange 6 (or 5) are positioned, and then the core shaft 14 is moved to the left in FIG. 3 by a drive mechanism (not shown), and the connecting member 18. Each T-shaped block 17 is also moved to the left via the pivot pin 19. At this time, since the movement of each split collet 21 in the axial direction is restricted by the back plate 22.25, it is pushed by the inclined surface 17a of each T-shaped block 17 and moves in the radial direction,
The combustion cavity 2 and the thick-walled flange 6 (or 5) are each fixed from the inner peripheral surface side. Then, in this state, the butt portions are welded to join the combustion cavity 2 and the thick-walled flange 6 (or 5) via the welded portion 4 (or 6), and then the core #11'14 is When moved to the right in the figure, each split collet 21 moves radially inward in response to the movement of each T-shaped block 17, and the combustion cavity 2 and thick-walled flange 6
(or 5), the cylindrical member and the holding device 10
It becomes possible to separate the

However, when such a conventional holding device 10 is used to hold a product having a thick inner flange 6.5 as shown in the illustrated example, the inner diameter of the thick flange 6.5 is melted (
The outer diameter of the split collet 21 must be smaller than the inner diameter of the thick-walled flange 6.5 when removed from the holding device 10 after welding. It was necessary to increase the range of movement of the mold collet 21 in the radial direction. However, when the width of this radial movement increases, the gap between each split collet 21 (Fig. 4 d) becomes large while the cylindrical part is held from the inner circumferential surface 1111. During welding, the difference in thermal stress between the gap and the area where the collet hits the edge causes problems such as weld defects, weld depression, and deformation, resulting in a reduction in layer weight accuracy.

This invention was made by focusing on the above-mentioned conventional problems, and it is possible to minimize the range of movement of the collet in the radial direction, and when the cylindrical member is held by the collet, there is a large It is an object of the present invention to provide a cylindrical member holding device that can prevent gaps from forming and that can satisfactorily hold and remove cylindrical members whose internal diameters differ greatly from one another.

This invention holds a cylindrical member by making a number of collets divided in the radial direction movable in the radial direction.
In the @ position, the dividing surface of the collet is I! t
It is characterized in that it is tilted with respect to the h-direction and is movable in the axial direction by a component force from the partially engaged 5+4 surfaces of the collet.

The present invention will be explained in detail below.

6 to 13 are diagrams showing an embodiment of the present invention, in which the holding device 1t30 shown in 1-1 is a hollow @6
A hollow shaft time keeping body 62 for holding the hollow shaft 61 in a predetermined position is attached to the middle part of the shaft 1, and a hollow I pongee support 66 is fixed to the end. A core shaft 64 connected to a driver 4m (not shown may be used manually) is inserted into the hollow shaft 61. Further, an lr type block guide member 65 is fixed to the outer peripheral part of the hollow shaft 61 with screws 66, and a 90° angle is set along the guide member 65.
Four T-shaped blocks 67 provided at intervals are slidable in the axial direction. These four TW blocks 67 each have an inclined surface 37a, and the core shaft 64
A long hole 31a fixed to the end of the hollow shaft 61 and formed in the hollow shaft 61
They are connected via pivot pins 69 to cross-shaped connecting members 68 that protrude further to the outside, and are slidable in the axial direction as the core shaft 64 moves.

Each T-shaped block 67 has a T-shaped block formed on the collet base 45 as a collet divided into four parts in the radial direction.
Loosely fit the shaped groove 45a and connect both 1 [IL] of the collet base 45.
+ii is provided with a patch plate 42.43, and this patch plate 42.
43 to the T-shaped block guide member 65, the collet base 45 is prevented from moving in the axial direction, and the T-shaped block guide member 65 is fixed.
The axial movement of the mold block 67 causes the collet base 45 to move only in the radial direction.

The above-mentioned collet base 45 is divided into two pieces facing each other, and has a through hole 45 formed in the collet base 45.
The collet 41 can be slid in the axial direction of the bin 47 with respect to the collet base 45 by fitting the fixed bin 47 into the collet base 45 and placing a compression spring 52 between the collet 47 and the seat plate 51. Furthermore, the collet 41 and the collet base 45 have their dividing surfaces 48 inclined with respect to the axial direction. In this case, the inclination direction of the dividing surface 48 is such that when the T-shaped block Otsu 7 moves to the right in FIG. The collet 41 is formed so as to be pressed to the left in the figure against the provided compression spring 52.

Next, the situation in which the combustion cavity 2 and the thick-walled flange 6.5 shown in FIG. 1 are held and welded using the holding device hf30 of the cylindrical member described above will be sequentially explained.

First, the core shaft 64 is moved to the right in FIG.
The combustion cavity 2 and the II flesh flange 6 (
' or 5) so that the flash alignment part is at the position 1N.

When the J-let base 45 and the collet 41 are moved in the axial direction (to the left) as shown in FIG. It is positioned at the outer peripheral groove 41b of the collet 41. Next, the body (not shown)! 1711
Move the core shaft 64 to the left in the figure by manual operation to move the end member 68. Each T-shaped block 67 is moved to the left in the figure via the pivot pin 69. At this time, the collet base 45 and the collet 41 increase their outer diameters and move one step at a time until both the dividing surfaces 48 become on the same plane, so that they come into pressure contact with the abutting portions as shown in FIG. The thick-walled flange 6 is held in abutted state. In addition, in the case where the collet base 45 is misaligned in the axial direction, the outer circumferential groove 41b is formed before the outer circumferential surface of the collet 41 is pressed into contact with the abutting portion.

Make sure that 45c is lined up with Tagawa. After holding in this way, apply appropriate melting at the butt part.
The combustion cavity 2 and the thick flange 6 are joined by forming the melting part 4 by the toothing method. Next, when joining the combustion cavity 2 and the thick-walled flange 5, the core shaft 64 is moved slightly to the right, the collet base 45 is moved slightly radially inward, and the outer circumferential groove of the collet 41 is aligned. Adjust the position 2.64 so that 41b is at the butt part between the combustion cavity 2 and the thick-walled 7 flange 5, and then move the core shaft 64 again to the left to hold the butt part. Perform welding in this condition.

When separating the rocket motor case 1 and the holding device W60 at the welding part, the core shaft 64 is moved rightward in FIG. 7, and the collet base 45 is shifted radially inward. At this time, the collet 41 has its dividing surface 48 aligned with the collet base 4.
As shown in FIG. 12, the collet 41 and the collet base 45 can move further in the radial direction than the conventional colliding mechanism, and the collet 41 and the collet base 45 can move in the radial direction further than the conventional colliding mechanism. As shown in FIG. 12, even when the inner diameter of the thick flange 5 is smaller than the inner diameter of the welded parts 4 and 6, it can be easily removed.

(7) Therefore, it is necessary to prevent a large gap from being formed between the collet 41 and the collet base 45 while holding the abutting portion as in the conventional method, so that there is no possibility of depression or deformation during welding. This makes it possible to prevent mismatches from occurring.

In the above embodiments, the rocket motor case was used as an example of the cylindrical member, but the holding device Rt according to the present invention is not limited to holding only such products, It goes without saying that the time retention is not limited to the case of welding, but may also be used to retain the surface of a cylindrical member during cutting operations such as surface polishing and thread cutting.

As explained above, according to the present invention, in an apparatus in which a cylindrical member can be held by making a set number of collets divided in the strip direction movable in the radial direction,
The dividing surface of the collet remains tilted with respect to the axial direction, and a part of the collet is made movable in the axial direction from the component force (C) from the dividing surface, thereby greatly increasing the radial movement of the collet. It is possible to prevent a large gap from forming between the collets when the cylindrical member is held by the collet, and the above-mentioned method is used to hold the butt part of the weld by the collet. Since the gap does not become large, it is possible to prevent defects such as welding and deformation of the welded part, and it is easy to maintain and remove cylindrical parts whose internal diameters differ greatly in parts. It has a very good effect in that it can be carried out conveniently and easily.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a rocket motor case shown as an example of a cylindrical member, Figure 2 (5L) is a perspective view showing a conventional cylindrical member holding device, and Figure 3 is a collet and 4 and 5 are respectively a front view and a side view of the collet shown in FIG. 2, and FIG. 6 shows a cylindrical member holding device according to an embodiment of the present invention. Oblique rust, clear view, Fig. 7 is a partial cross-sectional explanatory view of the collet and r-type block portion of the device shown in Fig. 6,
8 and 9 are a front view and a side view, respectively, of the collet shown in FIG. 6, FIG. 10 is a side explanatory view showing the state when the collet is moved in the radial direction, and FIG. 11 is the same as the collet shown in FIG. 6. An explanatory diagram showing the shape of the cylindrical member when held by the device;
FIG. 12 is an explanatory diagram showing a state when the device shown in FIG. 6 and the cylindrical member are separated, and FIG. 13 i/lj is a partially sectional explanatory diagram of the collet in FIG. 6. 60... Cylindrical member holding device 1. +11...Hollow shaft, 64...Core shaft, 67...T-shaped block, 67a.
... Inclined surface, 41... Collet, 41a... T-shaped groove, 42° 46... Backing plate, 45... Collet base, 48... Dividing surface. 430 Figure 3 Figure 4 Figure 5N

Claims (1)

[Claims] (1) The cylindrical member is maintained by making a plurality of collets divided in the radial direction movable in the radial direction. ′
l- In the device d that enables the collet to be divided, the outer periphery of the collet before division is tilted with respect to the @1 direction, and a part of the collet is made movable in the axial direction by a component force from before the division. A holding device for a cylindrical member.