JPS59104235A - Upsetting machine - Google Patents

Abstract

PURPOSE:To make a device compact and to enable reduction in cost by installing split dies which grip a blank pipe into a container and receiving upsetting force, via the containers, in the frame of an upsetting machine. CONSTITUTION:An upsetting machine consists of split dies 25a, 25b, an annular container 24 contg. the dies 25a, 25b, a clamping cylinder 28 which pushes and pulls the dies 25a, 25b in an axial center direction and a pressing device. Said dies 25a, 25b are of a truncated circular cone shape, and forms forming die holes 31 at the split end faces. The pressing device is formed of a mandrel 23a and punch 23 which are fitted into the holes 31 and press the end face of the blank pipe. The coupled surface between the dies 25a, 25b and the container 24 is formed of a slidable dovetail grooved joint 29. The device is made compact and the cost is reduced by the above-mentioned upsetting machine.

Description

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

Conventional upsetting machines have frames that are open at the top to reduce tool exchange time and facilitate product handling. However, since the frame must have sufficient strength in order to apply gripping force to the raw pipe, the frame inevitably becomes larger, which inevitably increases weight and cost.

Figure 1 shows a conventional upsetting machine. 1 is a fixed guide, 2 is a movable die, and the right front bed 6 and grip slide 11 respectively.
It is attached to the part of Left and right front bed 6
．． 4 is tightened by two front and rear tie rods 5, 5, 6, and 6, and is further tightened to the rear bed 7 by a tie rod 8.

9 is a punch, and 9a is a mandrel which can be moved back and forth by a heading slide 1o. 11 is a grip slide which moves the movable die 2 relative to the fixed die 1 and grips the raw tube inserted between both dies. The grip slide 11 is driven by a drive mechanism of the crank arm 13 → toggle actuating cam 14 → toggle slide 15. Note that 14a is a trouble return cam.

In the above configuration, the fixed die 1 and the movable die 2 grip the raw pipe, and the heading slide 1o pushes the punch 9 into the end of the raw pipe, thereby upsetting the end of the raw pipe. As mentioned above, this type of upsetting machine strongly grips the raw pipe with the fixed die 1 and the movable die 2, so the thickness dimension A of the right front bed 6 and the thickness of the left front bed 4 in FIG. Since dimension B must be made very large to provide rigidity,
The problem of increased weight and, ultimately, increased cost cannot be avoided.

The present invention has been made to overcome the disadvantages of known upsetting machines, such as their increased cost. The configuration that meets this problem is summarized as follows. The part that grips the raw pipe, that is, the grip housing, is a ring-shaped frame, and the inner surface of this grip housing is sloped, and a pair of grip dies, which are divided into two parts, is inserted into the inside of this frame, and this is opened and closed using a hydraulic cylinder, etc. It is designed to be driven.

Embodiments of the above invention will be described below with reference to FIG. 6 and subsequent figures. 21 is an upsetting machine frame which receives a force in the upsetting direction. A heading slide 22 is driven by an upset cylinder 26 fixed to the frame 21, and a bow 23 is attached to the front of the heading slide 22.
Uploading of the raw pipe 27 is performed by the following steps. 23a is a mandrel. Note that two upsetting sections each consisting of a punch 23 and a mandrel 23a are provided, one for rough finishing and one for finishing.

During upsetting, the blank tube 27 is gripped by the die 25. die 2
5 is the dividing plane 30 (Fig. 5) 25a and 25b (7)
A ring-shaped container that is divided into two halves24
The clamp cylinder 28 is driven to open and close along a sloped surface provided on the inner surface of the clamp cylinder 28. The die 25a is divided into two.

25b is slidably attached to a dovetail groove 29 provided on the inner surface of the container 24 and a dovetail joint, as shown in FIG. Furthermore, a molding die hole 31 is provided on the divided end face.

Before inserting the raw tube 27, the heading slide 22 is in a retracted state to the left, and the die 25 is in a state where the clamp cylinder 28
, and is moved to the left (X direction in FIG. 6), and the mating surface 3o of the die 25 is open. After inserting the raw pipe 27 into the fixed position in the upsetting machine, first insert the clamp cylinder 2.
8 to drive the die 25 to the right (Y direction in FIG. 6) to grip the raw tube 27. Next, the upset cylinder 26 is operated to upset the raw pipe 27 using the punch 23 and the mandrel 25a. At this time, the gripping force is received by the ring-shaped container 24, and is further received by the frame 2, which has a compact volume, so that the frame 21 is lightened.

After rough finishing, when the clamp cylinder 28 is operated in the direction of arrow X in FIG.
The tube 25b is separated from the dividing surface 3o to the left and right, and the blank tube 27 is moved to the upper finishing diamond hole position through this open gap, and thereafter finishing molding is performed in the same manner as described above. In the above embodiment, the mandrel 23a and the punch 23
Although the hydraulic cylinder 26 is used as the driving means for the pressurizing device, it may of course be driven by a crank arm as in the conventional example.

As described above, according to the present invention, the dividing die that grips the raw pipe is built into the container, and the upsetting machine frame receives the upsetting force through this, so that the apparatus can be made very compact. This made it possible to significantly reduce weight and cost.

Furthermore, since the dividing die and the container are formed into a dovetail joint that can slide on an inclined surface, the operation is extremely smooth, which is favorable in terms of product accuracy.

[Brief explanation of drawings]

FIG. 1 is a plan view of a conventional device. FIG. 2 is a sectional view taken along line nn in FIG. 1. FIG. 6 is a sectional view of the upsetting machine according to the present invention. FIG. 4 is a sectional view taken in the direction of the ■ arrow in FIG. 6. FIG. 5 shows the container and the dividing die in a view taken along the arrow V in FIG. In the figure; 21 (upsetting i) frame 22 heading slide 23 punch 23a mandrel 24 container 25 die 25a
, 25b Split die 26 Upset cylinder 27 Raw tube 28
Clamp cylinder 29 Dovetail groove 30
Mating surface 31 Above the die hole Applicant Sumitomo Heavy Industries, Ltd. Sub-agent Patent attorney Isamu Ohashi

Claims (1)

[Claims] A split gouie in the shape of a truncated pyramid forming a molding gou hole in the split end face, a ring-shaped container containing the gou, and a clamp cylinder that pushes and pulls the split gou in the axial direction;
The installation is characterized in that it is equipped with a pressurizing device consisting of a mandrel and a punch that fit into the die hole and pressurize the end face of the raw pipe, and the connecting surface between each splitting gou and the container is a slidable dovetail joint. Insertion machine.