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Mold used for sewing machine pedal plate

A technology for pedals and sewing machines, which is applied in the field of molds for sewing machine pedals, which can solve problems such as heat can not be dissipated, affect the quality of die-casting, and poor heat dissipation, so as to reduce the tendency of thermal fatigue and excellent overall stress Performance, the effect of reducing the degree of heat exposure

Inactive Publication Date: 2016-03-30
NINGBO RUIMING MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a high service temperature is often difficult for ordinary materials to withstand
Although the mold core is mainly subjected to high temperature, if the heat dissipation of the movable mold and the static mold on the outer layer of the mold core is not good, the heat during die casting cannot be dissipated, which will cause damage to the mold core in the long run and affect the quality of die casting

Method used

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  • Mold used for sewing machine pedal plate
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  • Mold used for sewing machine pedal plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The three-dimensional braided carbon fiber aluminum alloy composite material used to make the dynamic and static molds is made of 15% three-dimensional braided carbon fiber and 85% aluminum alloy.

[0050] The preparation process of three-dimensional braided carbon fiber aluminum alloy composite material is as follows:

[0051] The carbon fiber is woven into a prefabricated part through three-dimensional five-way mixing, and the weaving angle is 35 degrees, and then the carbon fiber prefabricated part is ultrasonically assisted with ethanol or methylene chloride for 20 minutes to remove the glue, and then the surface of the carbon fiber is roughened with 45% nitric acid, and then The fiber preform is impregnated with SiO 2 In the sol, vacuum impregnate for 1 hour, take it out, dry it, and sinter it. The sintering temperature is 650°C, and the sintering time is 2 hours. The surface is coated with a layer of SiO with a thickness of 2.0 μm. 2 Coated 3D woven carbon fiber;...

Embodiment 2

[0054] The three-dimensional braided carbon fiber aluminum alloy composite material used to make the dynamic and static molds is made of 20% three-dimensional braided carbon fiber and 80% aluminum alloy.

[0055] The preparation process of three-dimensional braided carbon fiber aluminum alloy composite material is as follows:

[0056] The carbon fiber is made into a prefabricated part through three-dimensional five-way mixing, and the weaving angle is 30 degrees, and then the carbon fiber prefabricated part is ultrasonically assisted with ethanol or methylene chloride for 25 minutes to remove the glue, and then the surface of the carbon fiber is roughened with 40% nitric acid, and then The fiber preform is impregnated with SiO 2 In the sol, vacuum impregnated for 1.5h, took out and dried, and sintered. The sintering temperature was 640°C, and the sintering time was 1.5h. The surface was coated with a layer of SiO with a thickness of 1.5μm. 2 Coated 3D woven carbon fiber;

[...

Embodiment 3

[0059] The three-dimensional braided carbon fiber aluminum alloy composite material used to make the dynamic and static molds is made of 25% three-dimensional braided carbon fiber and 75% aluminum alloy.

[0060] The preparation process of three-dimensional braided carbon fiber aluminum alloy composite material is as follows:

[0061] The carbon fiber is woven into a prefabricated part through three-dimensional five-way blending, and the weaving angle is 25 degrees. Then, the prefabricated carbon fiber prefabricated part is ultrasonically treated with ethanol or methylene chloride for 30 minutes to remove the glue, and then the surface of the carbon fiber is roughened with 35% nitric acid, and then The fiber preform is impregnated with SiO 2 In the sol, vacuum impregnate for 2 hours, take it out, dry it, and sinter it. The sintering temperature is 630°C, and the sintering time is 1 hour. The surface is coated with a layer of SiO with a thickness of 1.0 μm. 2 Coated 3D woven car...

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Abstract

The invention relates to a mold used for a sewing machine pedal plate, and belongs to the technical field of molds. The mold comprises a movable mold and a fixed mold. Movable mold ejector rods are arranged on the two sides of the movable mold longitudinally, and a rotating rod is connected to each movable mold ejector rod. The fixed mold is provided with a horizontal rotating shaft, and the other end of each rotating rod is installed on the horizontal rotating shaft. Both the movable mold and the fixed mold are made of a three-dimension braided carbon fiber aluminum alloy composite material. The three-dimension braided carbon fiber aluminum alloy composite material comprises 15-25% v / v of three-dimension braided carbon fiber and 75-85% v / v of aluminum alloy, the three-dimension braided carbon fiber manufactured through three-dimensional five-direction mixed braiding, and the braiding angle is 20-35 degrees. The mold used for the sewing machine pedal plate is convenient to operate and high in working efficiency, and the requirement for operating skills of a worker is low; the movable mold and the fixed mold have high hardness, strength and impact resistance; the chemical corrosion resistance is good, the thermal conductivity is high, and the thermal expansibility is low; heat dissipating is fast, and the service life is long.

Description

technical field [0001] The invention belongs to the technical field of molds, and in particular relates to a mold for a sewing machine pedal. Background technique [0002] The sewing machine pedal is an important accessory on the sewing machine. It is mostly made of metal. It is required to have a good appearance and surface treatment without cracks, damage, burrs, rust and other defects. It is usually manufactured by die-casting. The basic process of die-casting is: the molten metal is first cast at a low or high speed and filled into the cavity of the mold. The mold has a movable cavity surface, which is forged under pressure during the cooling process of the molten metal, which eliminates the shrinkage of the blank. Loose defects also make the internal structure of the blank reach the broken grains of the forged state. The comprehensive mechanical properties of the blank are significantly improved. Traditional die-casting molds are usually more complicated to operate du...

Claims

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Application Information

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IPC IPC(8): B22D17/22
CPCB22D17/22B22D17/2209
Inventor 冯光松
Owner NINGBO RUIMING MACHINERY