A grinding fixture for high-hardness metal gaskets

Abstract

The present invention discloses a grinding fixture for high-hardness metal gaskets, comprising a differential head, a differential head fixing block, a grinding base, an extended push rod, and a gemstone sheet. The differential head is mounted above the grinding base, and the gemstone sheet is mounted below. A vertical through hole is provided at the center of the grinding base. The extended push rod is mounted in the through hole on the grinding base and is tightly fitted with the through hole. The top of the extended push rod is a smooth hemisphere or cone that contacts the differential head, and the bottom of the extended push rod contacts the metal gasket to be ground. The differential head controls the stepping distance of the extended push rod, thereby controlling the grinding thickness of the gasket, thereby achieving the purpose of precisely grinding the gasket. The fixture has a simple structure, low cost, high grinding efficiency, can accurately control the thickness of the grinding gasket, and can grind high-hardness metal gaskets.

Description

Technical Field

[0001] The invention relates to a grinding fixture, in particular to a grinding fixture used for high-hardness metal gaskets. Background Art

[0002] A gasket is a commonly used component placed between two objects to allow them to join or separate. The thickness of the gasket can also control the distance between the two mating surfaces. In some cases, when the distance between the mating surfaces of two objects needs to be precisely controlled, a gasket of a certain thickness is required. To obtain a gasket of a specific thickness with high precision, the manufacturer must provide the manufacturer with the required specifications. When the gasket thickness needs to be adjusted, the manufacturer must re-process it. This method is expensive, has a long processing cycle, and is inefficient. Currently, there are few reports on grinding tools that can precisely control the grinding amount. For example, there is a Chinese invention patent application with the number 201520243530.9, filed on April 21, 2015, entitled "A Thickness Trimming Device for Electromagnetic Parameter Test Samples." However, this trimming device is only suitable for trimming the thickness of electromagnetic parameter test samples. Trimming hard metal gaskets may cause wear on the steel platform, thereby affecting the trimming accuracy. Furthermore, if the steel platform is worn, the flatness of the trimmed surface of the gasket or sample cannot be guaranteed. Summary of the Invention

[0003] The problem to be solved by the present invention is to provide a grinding fixture for high-hardness metal gaskets, overcome the shortcomings of the existing technology, and provide a grinding fixture for high-hardness metal gaskets, which can quickly and accurately grind high-hardness metal gaskets to a specific thickness, thereby improving the accuracy and work efficiency of thickness adjustment of high-hardness metal gaskets.

[0004] A grinding fixture for high-hardness metal gaskets, comprising a differential head 1, a differential head fixing block 2, a grinding base 3, an extended push rod 5, and a gem piece 6. The differential head fixing block 2 is provided with a vertical through hole, and the differential head 1 is installed in the vertical through hole of the differential head fixing block 2 by screw fastening. A square groove is provided on the top of the grinding base 3, and a circular groove is provided at the bottom. A gasket limiting groove 7 whose size and shape match the size and shape of the gasket to be ground is also provided in the circular groove. The bottom of the gasket limiting groove 7 has an annular groove, the width of the annular groove is 0.5mm~1mm, and the depth is 1mm~2mm. Four threaded holes are provided at the bottom of the upper square groove, and internal threads are provided in the threaded holes. The size of the upper square groove matches the size of the differential head fixing block 2. The differential head fixing block 2 is installed in the square groove and is connected to the grinding base 3 by screws. The gem piece 6 is installed in the circular groove at the bottom of the grinding base 3 by gluing. After installation, the lower surface of the gem piece protrudes from the lower surface of the grinding base by 0.1~0.2mm. There is also a vertical through hole at the center of the grinding base 3. The through hole on the grinding base 3 is coaxially aligned with the through hole on the differential head fixing block 2. Four symmetrically arranged threaded holes are opened on the upper part of the grinding base 3. The limit screw 4 is stuck in the upper annular groove of the extended push rod 5 through the threaded hole, which plays a role in limiting the movement of the extended push rod 5. The extended push rod 5 is installed in the through hole on the grinding base 3 and fits tightly with the through hole. The upper part of the extended push rod 3 is a smooth hemisphere, which contacts the side head of the differential head 1. The outer surface roughness of the extended push rod is better than 0.8μm. An annular groove is opened in the upper middle part of the extended push rod 5. The width of the annular groove is 3 to 6mm. The lower part of the extended push rod 5 contacts the high-hardness gasket to be ground. The grinding base 3 is made of stainless steel alloy, and the extended push rod 5 is made of stainless steel alloy.

[0005] The outer surface roughness of the extended mandrel 5 is better than 0.8μm. The upper part of the extended mandrel 5 is a smooth hemisphere or cone. An annular groove is opened in the middle of the extended mandrel 5. The width of the annular groove is 3-6mm. The material of the extended mandrel 5 is stainless steel alloy.

[0006] There is a through hole in the center of the gem piece 6. The shape and size of the through hole match the shape and size of the gasket to be ground. After installation, the lower surface of the gem piece 6 protrudes from the lower surface of the grinding base 3 by 0.1 to 0.2 mm. The material of the gem piece 6 is wear-resistant sapphire.

[0007] The opening size and shape of the gasket limiting groove 7 match the size and shape of the gasket to be ground. An annular groove is provided at the bottom of the gasket limiting groove 7. The width of the annular groove is 0.5mm to 1mm and the depth is 1mm to 2mm.

[0008] The present invention has three significant features: First, the micrometer head of the present invention has a range of 0 to 10 mm and an accuracy of 0.01 mm. It can set the thickness of the pad to be ground off each time, achieving the purpose of precise and controllable pad thickness, and is simple and convenient to operate. Second, a wear-resistant gemstone piece is bonded to the grinding base, which can grind any pad with a hardness less than sapphire, and will not cause wear to the grinding fixture during the grinding of the pad, thereby improving the reliability and applicability of the grinding fixture. Third, the fixture of the present invention has a simple structure, low price, simple and convenient operation, a wide range of applications, and good economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 A schematic diagram of a grinding fixture for high-hardness metal gaskets;

[0010] Figure 2 a cross-sectional view of the grinding base;

[0011] 1 Differential head 2 Differential head fixing block 3 Grinding base 4 Limit screw 5 Extended ejector

[0012] 6. Gem piece 7. Gasket limiting groove. DETAILED DESCRIPTION

[0013] A high-hardness metal gasket grinding fixture comprises a micrometer head 1, a micrometer head fixing block 2, a grinding base 3, an extended push rod 5, and a gemstone 6. The grinding base 3 is 10 mm high and 65 mm in diameter, making it convenient for handheld grinding. The micrometer head 1 is mounted in a through-hole in the micrometer head fixing block 2, which is attached to a square groove on the upper surface of the grinding base 3 via three unevenly distributed screws. The extended push rod 5, with an 8 mm diameter, fits snugly into a circular through-hole (8 mm in diameter) at the center of the grinding base 3. The upper surface of the extended push rod 5 is a hemisphere with a radius of 3 mm, which slides with the lower surface of the micrometer head 1. The upper middle portion of the extended push rod 5 has an annular groove with a width of 6 mm and a depth of 2 mm. A threaded hole is formed in the upper middle portion of the grinding base 3. A 4 mm diameter limit screw 4 passes through the threaded hole and is engaged in the annular groove of the extended push rod 5. In the initial state, the extended push rod 5 is locked to prevent it from sliding. A 50mm diameter sapphire disc 6 is glued into a 50.1mm diameter circular groove on the lower surface of the grinding base 3. The circular groove is 0.5mm deep, and the sapphire disc 6 is 0.6mm thick. The lower surface of the sapphire disc 6 protrudes 0.1mm from the lower surface of the grinding base 3, protecting the grinding base 3 from wear during grinding. A 12mm diameter through-hole is provided in the center of the sapphire disc 6. The grinding pad is a 1.2mm thick, 12mm diameter circular tungsten-copper pad. The pad retaining groove 7 at the bottom of the grinding base 3 has a diameter of 12mm and a depth of 1.2mm. The bottom of the pad retaining groove 7 has an annular groove with a width of 0.5mm and a depth of 1mm. This groove is used to collect debris generated during grinding and prevent it from entering the central through-hole of the grinding base 3 and causing wear on the inner wall of the through-hole. The tungsten-copper pad to be ground is placed in the pad retaining groove 7.

[0014] During grinding, first loosen the limit screw 4 to make the extended push rod 5 active, then place the gasket to be ground in the hole in the center of the gem piece 6, in contact with the lower surface of the extended push rod 5, adjust the differential head 1 so that the lower surface of the gasket and the lower surface of the gem piece 6 are in the same plane, then pre-adjust the differential head 1 and set the step distance to 0.01mm, that is, control the thickness to be ground to 0.01mm, and then grind the gasket until the lower surface of the gasket is again in the same plane with the lower surface of the gem piece. The grinding is completed and a tungsten copper gasket with a thickness of 1.19mm is obtained.

Claims

1. A grinding fixture for high-hardness metal gaskets, comprising a micrometer head (1), a micrometer head fixing block (2), a grinding base (3), an extended ejector rod (5), and a jewel piece (6), characterized by: The micrometer head (1) is fixed in the through hole of the micrometer head fixing block (2) by screw fastening connection, the micrometer head fixing block (2) is installed in the square groove above the grinding base (3) by screw connection, the limit screw (4) is installed in the upper threaded hole of the grinding base (3) by thread connection, the extended top rod (5) is installed in the through hole in the center of the grinding base (3) by tight fit, a gasket limiting groove (7) is provided in the center of the circular groove at the bottom of the grinding base (3), the gasket is installed in the gasket limiting groove (7), the gem piece (6) is installed in the circular groove at the bottom of the grinding base (3) by gluing, and after installation, the lower surface of the gem piece (6) protrudes 0.1 to 0.2 mm from the lower surface of the grinding base (3); The outer surface roughness of the extended mandrel (5) is better than 0.8 μm, the upper part of the extended mandrel (5) is a smooth hemisphere or cone, the middle part of the extended mandrel (5) is provided with an annular groove, the width of the annular groove is 3 to 6 mm, and the material of the extended mandrel (5) is a stainless steel alloy; The gemstone piece (6) has a through hole at its center, the shape of which matches the shape of the gasket to be ground, and is square or circular, and the gemstone piece (6) is made of sapphire; The opening size and shape of the gasket limiting groove (7) match the size and shape of the gasket to be ground. The bottom of the gasket limiting groove (7) is provided with an annular groove with a width of 0.5mm to 1mm and a depth of 1mm to 2mm.

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