JPS5927711A - Extruding machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a friction-actuated continuous extrusion machine primarily, but not exclusively, to metals.
A passageway is formed between the arcuate first member and the wheel-shaped second member having a groove in its circumferential surface and a first portion protruding into the groove; The material is drawn into this channel by the rotation of the channel and directed towards one end (the outlet) of the channel, at the outlet of the channel there is an elongated perpendicular part in the shape of a ridge, and at least one The present invention relates to an extrusion machine in which two dies extend through the aperture member or a portion of the arcuate first member adjacent thereto.

This contact member is (specification of British patent 1370894?ll
It may be large enough to completely block the passageway of the material (as described in '), especially if the material to be extruded is a relatively hard metal such as copper. As described in our British Patent No. 2069389B, the abutment member is substantially smaller in cross-sectional area than the material passage, so that there is a substantial gap between the abutment member and the groove surface, which The material to be extruded therefore sticks to the groove surface, and a portion of it (apart from the beam caused by the clearance provided for the movement of the machine) resides in this gap. , it will remain covering the groove surface and will re-enter the material path, while the remaining part of the material will pass through the die (1
We believe that it is better to extrude the material through one or more of the following.

Such machines are commonly known as "conform" machines, and we will use this term below (4).

The wheels of conoform extrusion machines are subjected to very high and cyclic stresses and are susceptible to premature failure due to fatigue cracking, with the result that machine operation is adversely affected by long downtimes and substantial repair costs.

This fatigue cracking problem has led to the adoption of wheel construction with two jaw members and a central huff, which is the base of the monthly charge passage, instead of a one-piece wheel.

Conventionally, it has been usual for the side wall of the hole groove to be formed by the side wall of the hole groove, and it has also been proposed to form the side wall of the hole groove as a separate ring. As a result of our experiments with a wheel with such a structure, we established a sliding surface between the jaw member and the ring, made the sliding surface almost parallel to the side wall of the wheel groove, and half the width of the groove from the side wall. From the above, I learned that it is preferable to place it at a distance of 2 times or less, but at least 3 fights away.

The two types of wheels mentioned above (for simplicity, hereafter we will refer to them as ``3-piece'' and ``5-piece'', respectively, even though each of these usually has additional auxiliary parts).
A J-shaped wheel (hereinafter referred to as a wheel with part cost j) is generally cooled by water or other cooling medium flowing through the J-shaped path between the parts. In practice, it is almost always necessary to provide a duct extending through the jaw member to provide drainage from the jaw member. The hub is usually also ducted, most commonly the cooling medium enters through each of four artificial ducts equally spaced in the jaw member on one side, extending over l/8 of the circumference. It flows circumferentially through the hub; it passes through a transfer duct that passes through the hub, flows in the opposite circumferential direction (to cause mixing with what has flowed from the adjacent duct), and passes through the other jaw member. through and through outlet ducts located on the same axis as each inlet duct.

The temperature of the walls of these cooling medium ducts is much lower than that of each wheel section 4A where the ducts are installed, and therefore the walls around the ducts may crack.
And it is inevitable that stress concentration will occur that will lead to fatal failure of the hole.

The present invention seeks to substantially alleviate this phenomenon and extend the average life of the wheel.

According to the present invention 1. At least the cooling medium duct that runs through both side parts (and preferably the duct that goes through the huff if it is an OT function) is made of insulating material so that cooling is concentrated on one side of the annular passage between the parts. It is lined with.

As the heat insulating material, any material with suitable color/fluid properties can be used, but heat-resistant plastic materials such as PTl/'E (Teflon) are preferred.

It may be applied with a conite f-ring or may be used in the form of a sleeve shaped to precisely fit the diameter of the duct. A thickness of about 0.05 m5 would be quite effective, but the thickness is 1 to 5 mx.
It is better to do so. When using a molded sleeve 7, make sure that it does not move in the direction of flow of the cooling medium.
In order to avoid other causes of damage, it is preferable not to provide a keyway for transmitting drive torque between the various parts of the wheel.

Hereinafter, the present invention will be explained by way of examples with reference to the accompanying drawings.

The wheel consists of two akobe moons 1, one huff 2 and a pair of rings 3. Ring 3 and Hough 2 are extruded from 11
A groove 4 for processing is formed, and all of these portions 4A are in contact with a 1-inch annular cooling medium passage 5.

The inlet duct 6 and the outlet duct 8 passing through both of the iron parts, and the transfer duct 7 passing through the huff 2 form a fluid flow passage.According to the present invention, these ducts 6, 7. 8 is a flange 1 at the end on the cooling medium inflow side.
0 is provided with a PTF E sleep 9 liner.

As best understood from FIG. 3, the cooling medium enters in a conventional manner from the wheel member 11 and passes through one of the inlet ducts 6, passing the cooling medium into the first (right-hand) annular cooling medium. It flows into the passage 5 and into the jaw member l of the right fi11. Here the flow is divided into two parts and proceed in opposite directions along the annular coolant channel 5.

After traveling 45° (angle relative to the axis of the wheel member 11), it encounters the cooling medium flowing in the opposite direction coming from the adjacent inlet duct 6, mixes with it, and passes through the transfer duct 7 to the 2 (on the left) annular cooling medium passage 5. The mixed flow is now recirculated and travels in the opposite direction along the annular coolant passage 5 before passing through the outlet duct 8 whose axis is aligned with the inlet duct 6 through which it passed. Go through and leave.

(1-1 and lj-11 in Figure 3 correspond to 1 of 41 similar points in Figures 1 and 2, respectively) In an actual conform type extrusion machine, the structure of the hole is as shown in Figures 1 and 2, and its circumference is 1ms.
The ditch was essentially nine squares.

The diameter of the cooling medium duct 6.7.8 is 8 us, PTI
"I"

The three 79 has an inner diameter of 67yJII and a wall thickness of 1. ducts 6 and 7 without clearance at nominal dimensions.
It was sized to fit an angle of 8°. The flange 10 had a thickness of 2y and an outer diameter of about lO.

The quantitative effects of these insulating sleeves are estimated as follows. The inner and outer radii are a and b, respectively, and the temperature is radius r-
Ta in a, ′1゛b in r = b
For an infinitely long hollow cylinder, the 7 grade distribution 1'(
r) is s r ”Condction of Hea
t in 5olids” 11.8Cars
co-authored by J, C, Jaeger, 0xfo
rd [Jnive-rsity I'ress Publishing 1
959.

The circumferential component σθ of the stress generated from the C quality distribution 'I''(r)l is r'' Theory of 1Dlast
icity” S, Timoshenk.

and J.N. Goodier, Me Graw
Hi 11 Published in 1951.

Cil I, α is the coefficient of thermal expansion, E is the −)′ Knob ratio, and H is the constant. By the way, since it is, substituting this into equation (2) to find the circumferential direction component σ of the stress in the case of r''a, the equation (3) becomes as follows.

Even in the case of a hole drilled in an object, if the hole is small (4)
The equation gives a nearly good approximation of the circumferential stress around the hole.

Steel BH] 3 and literary talent, I C 2.16 × 10 ” ”'/m” +α-1,
25X 10℃.

If we assume that the level is 0.3 and Tb - Ta = 50°C, then we obtain σ - tg□MN/ using the 4+ formula.

θ−・− Thermal conductivity 1. If the sleeve 7 with an inner radius C is inserted into the hole shown in FIG. 1 and the vorticity is l'a at the inner radius r-c, then the vorticity at the radius r''a is as follows.

K2 - Thermal conductivity of steel (13 - 25 Wm ℃ 1 - 1, = Thermal conductivity of PTFE - 0,015 Wm ℃
If the stress is not large, the thermal stress is almost completely removed.

Our research has revealed numerous causes of injury,
Since these issues have been addressed simultaneously, no rigorous experimental comparisons have been made. However, when extruding fine-grained steel with a hole whose main dimensions are the same and where the groove is formed directly between the double-jaw member and the flat hub, 170 tons of copper were machined. Seven failures occurred in the jaw member (average shear was 24 tons per failure). Investigation revealed that two of the failures occurred from the coolant passages (one such failure per 112 units). Other failures occurred from the keyways, small rounded machined internal corners, and also from the groove corners, which were not relevant to the present invention.

It is not considered that the occurrence rate of breakage in the cooling medium duct has changed much by eliminating the keyway and using the jaw member and the lick 3, which are not separate from each other. by the way,
The machine according to the invention exemplified herein has extruded 2,601 tons of copper under similar conditions without causing any damage to the jaw members.

[Brief Description of the Drawings] Figure 1 is a cross-sectional view of the main components of the wheel of the conform type extrusion machine according to the present invention, and Figure 2 is a cross-sectional view of the main components of the wheel of the conform type extrusion machine according to the present invention. FIG. 3 is a cross-sectional view taken 45 degrees apart in the circumferential direction of the wheel, and FIG. 3 is a diagram showing the distribution of the flow of cooling medium passing through the wheel. 1: Jaw Anatomy Patent applicant BIC Public Limited Convenience

Claims (4)

[Claims] (1) The wheel has two jaw members and the center /'%
a conformal extrusion machine configured with a hub and configured to flow a cooling medium through an annular passageway between the jaw members and the hub, the cooling medium comprising a duct extending through the jaw members; A conform type extrusion machine characterized in that the duct passing through the jaw member is lined with a heat insulating material so that the work is concentrated on the wall of the annular passage between the parts. (2) The conform type extrusion machine according to claim 1, wherein the duct passing through the huff is also lined with a heat insulating material. (3) The conform type extrusion according to claim 1 or 2, wherein the groove of the wheel is formed by a central huff and two rings f separate from both jaw members. machine. (4) The sliding surface between the jaw member and the ring is approximately parallel to the side wall of the groove of the wheel, and is at a distance from the side wall of more than half the width of the groove and less than twice the width, but a minimum of 3 mm. A conform type extrusion machine according to claim 3.