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Billet length schedule simulation
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**EM**

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Extrusion Management
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RCDIGITAL,Inc.

May 2019

1
Billet length schedule simulation

It is a billet length schedule simulation program that can be conveniently used at the extrusion work site.
The factory's system department calculates the billet length and the number of billets per extrusion die. Make the billet length maximum.
However, extrusion workers perform extrusion work while changing their billet lengths in order to improve product yield.
The reason is that the length of the long billet is used for extrusion, and there are changes in extrusion length (the product unit weight changes due to heat) and the occurrence of defects.
Because long billets are expensive, they should not be wasted.

1-1Five modes for billet length schedule

- Make the billet length constant in consideration of the long billet length. For example, when the billet length is 600 mm, the remainder of the long billet is 400 mm. The first cutting of the next long billet will be 200 mm.
- Simulate a billet cutting plan so that there are no long billet rests. For example, when the remainder of the long billet is 100 [mm], shorten some billet lengths planned before that. Divide the shortened portion into a billet length of 100 mm. As a result, the last billet can also be extruded.
- A mode that does not consider long billets. Specify the first billet length. Others simulate the billet length schedule for the order quantity to maximize billet length.
- A mode that does not consider long billets. Calculate the first billet length by the distance between platens. Others simulate the billet length schedule for the order quantity to maximize billet length.
- A mode that does not consider long billets. Simulate the billet length schedule for the order quantity without specifying the first billet length.

1-2
Advantages of extrusion management PC, factory system database, puller PLC, billet cutting PLC network configuration

- You can get the order quantity, extrusion die cross section etc from the system database.
- You can send billet cutting plan to billet cutting PLC.
- From the measured extrusion length, the product unit weight can be calculated to calculate the exact billet length.

Figure 1-1 The RcdWin, EM, EDA program personal computer is connected to the factory system database, press PLC, puller PLC, billet long cut PLC by network.

2
Considering long billets (Billet length is constant)

Explanation of simulation

The billet length schedule is simulated so that the extrusion billet length is constant, taking into consideration the long billet length.

Calculate billet length schedule for the order quantity.

- The maximum billet length is 565 [mm], but the first billet length is 400 [mm], so 1-1 is 400 [mm].
- 2-1 of the second long billet is 165 [mm]. It becomes 565 [mm] when 400 [mm] of 1-1 is added. For 2-2, there are 11 565 [mm]. 2-3 is one 104 mm billet.
- 3-1 of the third long billet will be one 461 [mm]. It becomes 565 [mm] when adding 104 [mm] of 2-3. For 3-2, there are four 565 [mm]. This is the end because we have scheduled billets of the order quantity.

Fig. 2-1 Billet length schedule to make billet length constant in consideration of long billet

3
Considering long billets (Use-up of long billets)

Simulation Description

Calculate the billet length schedule so that there are no long billet length remainders.

Calculate billet length schedule for the order quantity.

- The maximum billet length is 565 [mm], but the first billet length is 400 [mm], so 1-1 is 400 [mm].
- The second long billet is 10 pieces for 565 [mm], 1 piece for 463 [mm], and 1 piece for 373 [mm]. It is 6500 [mm] in all. I will use up a long billet.
- The third long billet is four 565 mm, one 361 mm, and one 373 mm. This is the end because we have scheduled billets of the order quantity.

Fig. 3-1 When calculating the billet length, set the remainder of the long billet length to 0 and use up the long billet.

4
Designation of the first billet length

Explanation of simulation

The first billet specifies the billet length. After the second run, the maximum billet length is calculated.

Calculate billet length schedule for the order quantity.

- 1-1 is one 400m of specified billet length.
- 1-2 will be 10 maximum billet length 565 [mm].
- There are six 521 [mm] for 1-3.
- 1-4 sets 628 [mm] to 1 in order to make the order quantity equal to the calculated product quantity.

Fig. 4-1 For the first run, specify the billet length and calculate the billet length schedule for the order quantity.

5
Platen distance specification (for 1st billet length)

Explanation of simulation

The first billet takes into consideration the distance between the platens. After the second run, the maximum billet length is calculated.

Calculate billet length schedule for the order quantity.

- 1-1 is 592 [mm] in consideration of the distance between platens.
- 1-2 has a maximum billet length of 565 [mm] of 15.
- There are six 521 [mm] for 1-3.
- 1-3 is one 476 [mm] to equal the order quantity and the calculation product quantity.

Fig. 5-1 The first run takes into consideration the distance between platens. Calculate billet length schedule for the order quantity.

6
Ordinary billet length schedule calculation

Explanation of simulation

Calculate the maximum billet length. Calculate billet length schedule for the order quantity.

- 1-1 has a maximum billet length of 565 [mm] of 16 pieces.
- 1-2 sets 476 [mm] to 1 in order to make the order quantity equal to the calculated product quantity.

Fig. 6-1 Calculate billet length schedule for the order quantity.