JPS603938A - Large-sized upsetting machine - Google Patents

Abstract

PURPOSE:To enable reduction in the size of the frame of an upsetting machine by receiving the gripping force on a blank pipe by dies with the container alone and receiving the upsetting force with columns connecting a main frame and a cylinder frame. CONSTITUTION:Segmental dies 8 are closed when a blank pipe 9 is inserted into a container 7. Pressurized oil is then supplied to a cylinder 1 to extend a ram 1a and to advance a mandrel 6 together with a moving cross head 2 thereby upsetting the end of the pipe 9. The container 7 stops by contacting with a main fram 4 in this stage and the segmental dies 8a, 8b which are forced to be opened by upsetting are blocked by a graded surface effect. The ram 1a is thereafter contracted and the mandrel 2 retreats together with the head 2. The dies 8 are opened by the opening operation of a clamping cylinder 11 and the pipe 9 is retreated. The container 7 and the mandrel 6 are respectively rotated by columns 5 and the dies and mandrel for the 2nd stage are set in the body and the upsetting for the 2nd stage is accomplished.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a large upsetting machine used to form a thick wall portion at the end of a large diameter steel pipe.

Conventional upsetting machines were designed to improve productivity, reduce the time required to change tools, and facilitate product handling. The disadvantage of this is that the frame receives the gripping force, so when it comes to upsetting machines for large-diameter steel pipes that require a large gripping force, the frame naturally becomes huge.

On the other hand, there is not much demand for large-diameter rusted pipes, so large upsetting machines do not need to be mass-produced machines, but they have excessive quality, so the initial cost is inevitably high. I didn't get it.

The present invention was invented in view of the above circumstances.
This is an attempt to provide an inexpensive large-scale upsetting machine while accepting the decrease in productivity, and its structure is summarized as follows. That is, the gripping force is not received by the frame as in the conventional type, but is received within the container, and the upsetting force is received by the column connecting the main frame and the cylinder frame. In addition, the die and mandrel can each be rotated about the column as a support axis to facilitate their replacement, and the die and mandrel can also be cooled and lubricated from the outside.

Examples of the present invention will be described below. 1 is a cylinder for upseller 1, which generates upsetting force. The tip of a cylinder ram la of this cylinder is connected to a moving crosshead 2. The cylinder 1 is built into and fixed to a cylinder frame 3. The cylinder frame 3 and main frame 4 are connected by a column 5. A mandrel holder 6A having mandrels 6 fixed to both ends thereof is rotatably supported by the column 5, and is adapted to be engaged with the moving crosshead 2 and slid along the column 5. Holder 7
Containers 7 are fixed to both ends of A, and both containers 7 are rotatably supported by the column 5. A die 8 is built in each of the containers 7. Die 8 within container 7 is a split die.

As shown in the figure 11, the blank tube 9 is gripped by the tie 8. The die 8 is divided into two parts by a dividing surface 10, and is a ring-shaped container 7 which is driven to open and close by link mechanisms 11Δ and IIB operated by a clamp cylinder 11. As shown in FIG. 4, the two-part die 8 has a dovetail groove provided on the outer surface of the die 8 and a dovetail groove protruding from the inner surface of the container 7; it can be slid along the sloped surface inside the container 7 by hand 12. is obsessed with. 13 is a molding die hole provided in the split surface. A circumferential groove 6B is provided at the rear of the mandrel holder 6A, and this is a mandrel holder clamping member 6G fixed to the end surface of the moving crosshead 2.

It is designed to engage with 6D. Clamping members 6C and 6D
The clamping surface is an arcuate surface so that the rotated mandrel holder 6A can easily engage with it (the third
figure). 6E is a positioning ball, and a recess 6F is provided at the center of the end surface of the moving crosshead 2 in correspondence with the positioning ball.

Note that this positioning device can be replaced with any other positioning means, and although not shown, the container 7
, it is preferable to provide a similar positioning device between the main frames 4 as well.

Now, when the raw pipe 9 is inserted into the container 7, the dividing die 8
is closed. Pressure oil is then supplied to the cylinder 1, and the mandrel 6 moves forward integrally with the moving crosshead due to the extension of the ram 1a. Engineering. If@, = 1/month 73,1 it comes into contact with the main frame 4 and stops. Furthermore, the dividing dies 8a and 8b which are about to open for upsetting the blank tube are strongly blocked by the container itself due to the action of the sloped surface.

When the forming is completed, the mandrel 6 moves back together with the moving crosshead 2 due to the contraction of the ram 1a, and the dividing die 8 is opened by the opening operation of the clamp cylinder J1, and the blank tube 9 is opened.
After retreating, the container 7 and the mandrel 6 are rotated, and the die and mandrel for the second step are inserted into the main body.

A second step is carried out in the same manner as the previous step, and upsetting is carried out.

The mandrel 6 and the die 8 are cooled and lubricated while they are rotating around the column 5 and coming out of the main body (the first
(See figure nozzle 14).

As explained above, according to the present invention, 1) the gripping force of the raw pipe by the die 8 is not received by the frame, but is received only within the container 7, and the upsetting force is transmitted between the main frame 4 and the cylinder frame 3. Since it is made to be received by the connecting column 5, the frame can be made smaller.

2) Since the die and mandrel each rotate using the column 5 as a spindle, their replacement, lubrication, and cooling can be performed externally, making it possible to further improve work efficiency and work environment. .

In addition, in the explanation of Section 2, the case where the upsetting operation is performed in two steps was explained, but Icf! i! Of course, it can be used even if only.

[Brief explanation of drawings]

FIG. 1 is a plan sectional view of a large upsetting machine according to the present invention. FIG. 2 is a view along arrow 1l-II in FIG. 1, mainly showing the container and die. FIG. 3 is the same <1-111 arrow view, mainly showing the mandrel holder and the moving crosshead. FIG. 4 shows the container and die in the same < tV arrow view. In the figure: ■ Upset cylinder 2 Moving crosshead 3 Cylinder frame 4 Main frame 5 Column 6 Mandrel 7 Container 8 Die 9 Raw pipe 1o Split surface 11 Cylinder 12 Dovetail joint 13 Die hole and above Applicant Sumitomo Heavy Industries, Ltd. Sub-Agent Patent Attorney Isamu Ohashi Figure 2 Figure 3

Claims (1)

[Claims] A moving cross that rotates and holds a container with a built-in die attached to both ends of a column connecting the cylinder frame and the main frame, and a mandrel fixed to both ends in between, and engages the mandrel through its holder. A large upsetting machine characterized in that the head moves to engage and disengage from the die.