# US 2019/0168292 A1 · Method for positioning a core in a mould

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- Number: US 2019/0168292 A1
- Document ID: US20190168292A1
- Status: Published application
- Kind: A1
- Application number: 16/324,283
- Filed: 2017-08-03
- Published: 2019-06-06
- Earliest claimed: 2016-08-09
- Assignees: Safran Aircraft Engines
- Applicants: Safran Aircraft Engines
- Inventors: Vincent Michel ARGOUD; Thibault DALON
- Web page: https://patentgrep.com/patent/US20190168292A1

## CPC

- B22C 21/14: for reinforcing or securing moulding materials or cores, e.g. gaggers, chaplets, pins, bars
- B22C 9/108: {Installation of cores}
- B22C: FOUNDRY MOULDING (moulding refractory materials in general B28B)

## Abstract

The invention relates to a method for determining the position of the cores in an injection mould, comprising the steps essentially consisting of: selecting a core Rrep in a population of cores with the least difference from the mean of the measured differences between k cores and the theoretical three-dimensional spatial model, positioning this core Rrep in space relative to at least one of the functional faces of a theoretical three-dimensional spatial model of the core, and repositioning core support points so that they can support the core Rrep in the position corresponding to its repositioning in space performed in the previous step.

## Claims

### Claim at position 1

-11. (canceled)

### Claim 12

A method for determining the position of the cores in an injection mould, comprising the steps of:
a) Collecting k cores noted R1 . . . Ri . . . Rk in a population of cores all produced from the same theoretical three-dimensional core model,
b) making a three-dimensional model of each of the cores,
c) relocating each of the three-dimensional models in space relative to 1 support points T1 . . . Tq . . . Tl of the core in the mould to obtain a relocated three-dimensional spatial model of each core V1,
d) selecting the core noted Rrep the three-dimensional spatial model V1 of which has the least difference with the theoretical three-dimensional spatial model,
e) relocating the three-dimensional model of the core Rrep with the theoretical three-dimensional spatial model by taking into account at least one functional face of the theoretical model of the core in order to obtain a relocated three-dimensional spatial model V2 of the core Rrep,
f) repositioning the support points Tq so that it can support the core Rrep in the spatial position corresponding to the relocated three-dimensional spatial model V2 of the core Rrep.

### Claim 13 (depends on 12)

A method according to claim 12, wherein each three-dimensional model is obtained from a three-dimensional survey of the outer surface of the core, for example obtained from a contactless measurement.

### Claim 14 (depends on 12)

A method according to claim 12, wherein step d) comprises the following steps:
selecting n points noted P1 . . . Pj . . . Pn on at least one of the functional faces of the theoretical model of the core,
selecting the core Rrep the n points of the relocated three-dimensional spatial model V1 of which have the least difference with the same points n of the spatial theoretical model.

### Claim 15 (depends on 13)

A method according to claim 13, wherein step d) comprises the following steps:
selecting n points noted P1 . . . Pj . . . Pn on at least one of the functional faces of the theoretical model of the core,
selecting the core Rrep the n points of the relocated three-dimensional spatial model V1 of which have the least difference with the same points n of the spatial theoretical model.

### Claim 16 (depends on 14)

A method according to claim 14, wherein step d) comprises the following steps for each core Ri:
i. determining the difference Ei,j1 between each point Pj of the theoretical model and the model V1,
ii. calculating the average
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iii. calculating Δi,j1=Ei,j1−Mj(Ei,j1)
iv. calculating for each core Ri, Si1=Σj=1nΔi,j1 2
v. considering the core Ri which the lowest value is assigned Si1 to as the representative core Rrep of the core population.

### Claim 17 (depends on 12)

A method according to claim 12, comprising a checking step, between steps e) and f), consisting in verifying that the relocated spatial model V2 of the core Rrep is better positioned than the relocated spatial model V1 of the core Rrep.

### Claim 18 (depends on 4, 17)

A method according to claim 17 when it depends on claim 4, wherein the checking step includes the following steps:
i. determining the difference Erep,j2 between each point Pj of the theoretical three-dimensional spatial model and the relocated three-dimensional spatial model V2 of the core Rrep relative to the functional faces,
ii. calculating Srep2=Σj=1nEi,j2 2,
iii. comparing Srep2 with Srep1 in order to verify that Srep2 is less than Srep1.

### Claim 19 (depends on 16)

A method according to claim 16, wherein the difference Ei,j1 and/or the difference Erep,j2 are determined according to the normal to the theoretical three-dimensional spatial model at the point Pj.

### Claim 20 (depends on 18)

A method according to claim 18, wherein the difference Ei,j1 and/or the difference Erep,j2 are determined according to the normal to the theoretical three-dimensional spatial model at the point Pj.

### Claim 21 (depends on 12)

A method according to claim 12, wherein step f) comprises the following steps for each of the support points Tq:
projecting a point Tq as normal to the theoretical three-dimensional spatial model passing through the contact point of the support point Tq with the theoretical three-dimensional spatial model, on the relocated three-dimensional spatial model V2, in order to obtain a point T′q,
modifying the support points in the mould so that they are brought to the level of the points T′q.

### Claim 22 (depends on 12)

A method according to claim 12, wherein k is greater than or equal to five and/or l is greater than or equal to six.

### Claim 23 (depends on 3, 12)

A method according to claim 12, when it depends on claim 3, wherein n is greater than or equal to three.

### Claim 24 (depends on 12)

A method according to claim 12, wherein the injection mould is a wax injection mould.