Preparation process of nickel-chromium-copper strain constantan precision resistance alloy ultrathin foil

Abstract

The invention discloses a preparation process of a nickel-chromium-copper strain constantan precision resistance alloy ultrathin foil. A preparation technology of a nickel-chromium-copper strain constantan precision resistance alloy ultrathin foil comprises the following steps that firstly, raw materials are prepared, specifically, the raw materials comprise, by mass, 1.5%-2.5% of Mn, 41.5%-45.5% of Ni, smaller than or equal to 0.20% of Fe, smaller than or equal to 0.05% of Co, smaller than or equal to 0.10% of Ti, smaller than or equal to 0.05% of Mg, smaller than or equal to 0.10% of Si and the balance Cu; step 2, cold rolling process cold rolling treatment; step 3, vacuum heat treatment; the vacuum annealing temperature is 460-580 DEG C, and the heat preservation time is 4 hours; step 4, material pouring; step 5, inspection; and step 6, packaging and shipping.

Description

Technical Field

[0001] The invention relates to the technical field of electronic strain gauges, in particular to a method for preparing a strained copper foil. Background Art

[0002] Strain gauge Constantan foil is a copper-nickel alloy widely used in strain measurement and resistor manufacturing. It is composed of approximately 55% copper and 45% nickel (Cu 55 Ni 45 ) is characterized by its resistance to temperature changes and high resistivity. It has a low temperature coefficient of resistivity and medium resistivity, making it a core component of resistance strain gauges and ultimately applicable to electronic products such as large aircraft test components and reader / writer pens.

[0003] Patent No. TW200413703 discloses a method for manufacturing a strain gauge substrate and the resulting product. The strain gauge substrate comprises a polymer film layer and a constantan adhesive layer bonded to one side of the polymer film layer. The strain gauge substrate manufacturing method utilizes constantan, a copper-nickel alloy with a ratio of 50-60% copper and 50-40% nickel, as a sputtering target. The constantan adhesive layer is sputtered onto one side of the polymer film layer. This structure cannot achieve a thickness within the range of 5μm ± 0.2μm.

[0004] Currently, there is a lack of methods for preparing strained Constantan copper foil with a thickness range of 5 μm ± 0.2 μm. Summary of the Invention

[0005] In response to the problems existing in the prior art, the present invention provides a preparation process for an ultra-thin foil of a nickel-chromium-copper strain-constantan precision resistance alloy to solve at least one of the above technical problems.

[0006] In order to achieve the above object, the present invention provides a preparation process of an ultra-thin foil of a nickel-chromium-copper strain-constantan precision resistance alloy, which is characterized by comprising the following steps:

[0007] Step 1: Prepare raw materials:

[0008] The main chemical composition of the raw materials, by mass percentage, is Mn 1.5-2.5%, Ni 41.5-45.5%, Fe ≤ 0.20%, Co ≤ 0.05%, Ti ≤ 0.10%, Mg ≤ 0.05%, Si ≤ 0.10%, and the balance is Cu;

[0009] Step 2: Cold rolling process: cold rolling treatment;

[0010] Step 3: vacuum heat treatment; vacuum annealing temperature is 460-580℃, and holding time is 4h;

[0011] Step 4: pouring the material;

[0012] Step 5: Inspection;

[0013] Step six: packaging and shipment.

[0014] Further preferably, in step 2, the cold rolling process sequentially performs cutting, primary rolling, ultra-thin trimming, finishing rolling and multiple cleanings.

[0015] Further preferably, in step 2, the first rolling control pressure is 12000±50kg, the front tension is 350±5kg, and the rear tension is 170±5kg.

[0016] In step 2, ultra-thin trimming is performed using a blade with a 10° chamfer.

[0017] In step 2, during finish rolling, the pressure is controlled to be 1000±10kg, the front tension is 210±5kg, and the rear tension is 100±5kg.

[0018] Further preferably, in step 2, during multiple cleaning, the running speed of the foil is controlled to be 15 mpm and the electrolysis current is controlled to be 80 A.

[0019] Further preferably, in step 1, the thickness of the raw material is selected to be 0.10±0.008 mm.

[0020] Further preferably, the thickness of the product in step six is 5 μm±0.2 μm.

[0021] Further preferably, in step 5, the density of the product is 0.321 lbs / cu.in;

[0022] The melting point is 1210°C;

[0023] The resistivity is 50.8 Microhm·cm;

[0024] The temperature coefficient of resistivity is 14.9*10 -6 °C;

[0025] The electrical conductivity is 21.2W / m·K;

[0026] The specific heat is 0.094 gram· cal. / °C.

[0027] The resistance temperature coefficient tested from 25℃ to 105℃ is ± 30 ppm / ℃.

[0028] A process for preparing an ultra-thin foil of a nickel-chromium-copper strain-constantan precision resistance alloy, characterized by comprising the following steps:

[0029] Step 1: Prepare raw materials:

[0030] The main chemical composition of the raw materials, by mass percentage, is Mn 1.5-2.5%, Ni 41.5-45.5%, Fe ≤ 0.20%, Co ≤ 0.05%, Ti ≤ 0.10%, Mg ≤ 0.05%, Si ≤ 0.10%, and the balance is Cu;

[0031] Step 2: Cold rolling process: cold rolling treatment;

[0032] Cold rolling process The cold rolling process is carried out in sequence: cutting, first rolling, ultra-thin trimming, finishing rolling and multiple cleaning;

[0033] The controlled pressure of the first rolling mill is 12000±50kg, the front tension is 350±5kg, and the rear tension is 170±5kg;

[0034] Ultra-thin trimming uses a blade with a 10° chamfer;

[0035] During finishing rolling, the control pressure is 1000±10kg, the front tension is 210±5kg, and the rear tension is 100±5kg;

[0036] During multiple cleaning, the foil speed is controlled at 15mpm and the electrolysis current is 80A;

[0037] Step 3: vacuum heat treatment; vacuum annealing temperature is 460-580℃, and holding time is 4h;

[0038] Step 4: pouring the material;

[0039] Step 5: Inspection;

[0040] Step six: packaging and shipment.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] The present invention undergoes strict material selection, multiple production processes, and innovative vacuum annealing to ultimately produce strained copper foil with a thickness of 5μm±0.2μm. DETAILED DESCRIPTION

[0043] The present invention will be further described below.

[0044] Specific embodiment 1: A process for preparing an ultra-thin foil of a nickel-chromium-copper strain-constantan precision resistance alloy, comprising the following steps:

[0045] Step 1: Prepare raw materials:

[0046] The main chemical components of the raw materials, by mass percentage, are: Mn 1.5-2.5%, Ni 41.5-45.5%, Fe≤0.20%, Co≤0.05%, Ti≤0.10%, Mg≤0.05%, Si≤0.10%, and the balance is Cu.

[0047]

[0048] Step 2: Cold rolling process: cold rolling treatment;

[0049] Cold rolling process The cold rolling process is carried out in sequence: cutting, first rolling, ultra-thin trimming, finishing rolling and multiple cleaning;

[0050] The controlled pressure of the first rolling mill is 12000±50kg, the front tension is 350±5kg, and the rear tension is 170±5kg;

[0051] Ultra-thin trimming uses a blade with a 10° chamfer;

[0052] During finishing rolling, the control pressure is 1000±10kg, the front tension is 210±5kg, and the rear tension is 100±5kg;

[0053] During multiple cleaning, the foil speed is controlled at 15 mpm (meters per second) and the electrolysis current is 80 A;

[0054] Step 3: vacuum heat treatment; vacuum annealing temperature is 460-580℃, and holding time is 4h;

[0055] Step 4: pouring the material;

[0056] Step 5: Inspection;

[0057] Step six: packaging and shipment.

[0058] Core technology and requirements:

[0059]

[0060] After testing, the performance is as follows: Specifications are as follows:

[0061]

[0062] In step 5, the density of the product is 0.321 lbs / cu.in;

[0063] The melting point is 1210°C;

[0064] The resistivity is 50.8 Microhm·cm;

[0065] The temperature coefficient of resistivity is 14.9*10 -6 °C;

[0066] The electrical conductivity is 21.2W / m·K;

[0067] The specific heat is 0.094 gram· cal. / °C.

[0068] The resistance temperature coefficient tested from 25℃ to 105℃ is ± 30 ppm / ℃.

[0069] Thermal EMF vs. Copper (0°C to 100°C) is -0.043 Millivolts / °C.

[0070] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A process for preparing an ultra-thin foil of a nickel-chromium-copper strain-constantan precision resistance alloy, characterized in that: The steps include: Step 1: Prepare raw materials: The main chemical composition of the raw materials, by mass percentage, is Mn 1.5-2.5%, Ni 41.5-45.5%, Fe ≤ 0.20%, Co ≤ 0.05%, Ti ≤ 0.10%, Mg ≤ 0.05%, Si ≤ 0.10%, and the balance is Cu; Step 2: Cold rolling process: cold rolling treatment; Step 3: vacuum heat treatment; vacuum annealing temperature is 460-580°C, and the holding time is 4h; Step 4: pouring the material; Step 5: Inspection; Step six: packaging and shipment.

2. The process for preparing a nickel-chromium-copper strain-constantan precision resistance alloy ultra-thin foil according to claim 1, characterized in that: In step 2, the cold rolling process includes cutting, primary rolling, ultra-thin trimming, finishing rolling and multiple cleanings.

3. The process for preparing an ultra-thin nickel-chromium-copper strain-constantan precision resistance alloy foil according to claim 2, characterized in that: In step 2, the first rolling control pressure is 12000±50kg, the front tension is 350±5kg, and the rear tension is 170±5kg.

4. The process for preparing an ultra-thin nickel-chromium-copper strain-constantan precision resistance alloy foil according to claim 2, characterized in that: In step 2, ultra-thin trimming is performed using a blade with a 10° chamfer.

5. The process for preparing an ultra-thin nickel-chromium-copper strain-constantan precision resistance alloy foil according to claim 2, characterized in that: In step 2, during finish rolling, the pressure is controlled to be 1000±10kg, the front tension is 210±5kg, and the rear tension is 100±5kg.

6. The process for preparing an ultra-thin nickel-chromium-copper strain-constantan precision resistance alloy foil according to claim 2, characterized in that: In step 2, during multiple cleaning, the foil running speed is controlled to be 15 mpm and the electrolysis current is controlled to be 80 A.

7. The process for preparing an ultra-thin foil of a nickel-chromium-copper strain-constantan precision resistance alloy according to claim 1, characterized in that: In step 1, the thickness of the raw material is selected to be 0.10±0.008mm.

8. The process for preparing an ultra-thin foil of a nickel-chromium-copper strain-constantan precision resistance alloy according to claim 1, characterized in that: The thickness of the product in step six is 5 μm ± 0.2 μm.

9. The process for preparing an ultra-thin nickel-chromium-copper strain-constantan precision resistance alloy foil according to claim 1, characterized in that: In step five, the density of the product is 0.321 lbs / cu.in; The melting point is 1210°C; The resistivity is 50.8 Microhm·cm; The temperature coefficient of resistivity is 14.9*10 -6 °C; The electrical conductivity is 21.2W / m·K; The specific heat is 0.094 gram·cal. / °C. The temperature coefficient of resistance from 25°C to 105°C is ±30 ppm / °C.

10. A process for preparing an ultra-thin foil of a nickel-chromium-copper strain-constantan precision resistance alloy, characterized in that: The steps include: Step 1: Prepare raw materials: The main chemical composition of the raw materials, by mass percentage, is Mn 1.5-2.5%, Ni 41.5-45.5%, Fe ≤ 0.20%, Co ≤ 0.05%, Ti ≤ 0.10%, Mg ≤ 0.05%, Si ≤ 0.10%, and the balance is Cu; Step 2: Cold rolling process: cold rolling treatment; Cold rolling process The cold rolling process is carried out in sequence: cutting, first rolling, ultra-thin trimming, finishing rolling and multiple cleaning; The controlled pressure of the first rolling mill is 12000±50kg, the front tension is 350±5kg, and the rear tension is 170±5kg; Ultra-thin trimming uses a blade with a 10° chamfer; During finishing rolling, the control pressure is 1000±10kg, the front tension is 210±5kg, and the rear tension is 100±5kg; During multiple cleaning, the foil speed is controlled at 15mpm and the electrolysis current is 80A; Step 3: vacuum heat treatment; vacuum annealing temperature is 460-580℃, and holding time is 4h; Step 4: pouring the material; Step 5: Inspection; Step six: packaging and shipment.

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