Embedded type floor grinding machine chuck and grinding disc

Abstract

The invention relates to the technical field of abrasive discs, and particularly discloses an embedded type floor grinding machine chuck and abrasive disc which comprises an abrasive disc body, the abrasive disc body comprises an abrasive disc base body and an abrasive disc working layer, the abrasive disc base body is a metal base body or a resin base body, and the abrasive disc working layer comprises a metal abrasive disc and a resin abrasive disc; the grinding disc mainly comprises the grinding disc body and the chuck body, too many tedious parts and complex connecting modes are avoided, the manufacturing cost is reduced, the overall appearance is more concise and elegant, a user can easily understand and operate the grinding disc body, and the grinding disc body and the chuck body are tightly and stably connected and convenient to replace due to the design that the grinding disc body is embedded into the chuck body.

Description

Technical Field

[0001] The present invention relates to the technical field of abrasive discs, and particularly to a chuck and an abrasive disc for an embedded floor grinding machine. Background Art

[0002] With the continuous development of the construction industry, the requirements for the quality and aesthetics of floors are getting higher and higher. Concrete floors, grindstone floors, epoxy floors, etc. are widely used in various buildings, such as industrial factories, commercial places, public buildings, etc. These floors often need to be leveled, ground, polished, etc. during the construction process or after being used for a period of time, in order to achieve the purposes of smooth surface, beauty, and improved wear resistance. Floor diamond abrasive discs are diamond tools for leveling, grinding, and polishing concrete floors, grindstone floors, and epoxy floors; metal diamond abrasive discs are usually circular or fan-shaped, and the shape of resin diamond abrasive discs is generally circular. Different-shaped abrasive discs are suitable for different grinding equipment and grinding process requirements. The connection methods of metal-bonded diamond abrasive discs mainly include bolt fixation, chuck fixation, etc. The bolt fixation method can provide a relatively firm connection to ensure that the abrasive disc will not loosen or fall off during high-speed rotation, but the installation and disassembly are relatively troublesome. Chuck fixation is suitable for occasions where the abrasive disc needs to be frequently replaced, but the connection firmness is relatively weak. The connection method of resin diamond abrasive discs is usually adhesive. Since the shapes and connection methods of abrasive discs used in different processes are different, it is necessary to frequently replace the abrasive disc and the chuck body during the construction process, which brings a lot of inconvenience to the construction. Summary of the Invention

[0003] In view of the technical problems raised in the background art, the present invention provides a chuck and an abrasive disc for an embedded floor grinding machine.

[0004] The technical solution adopted by the present invention is: an abrasive disc for an embedded floor grinding machine, including an abrasive disc body, the abrasive disc body includes an abrasive disc base and an abrasive disc working layer, the abrasive disc base is a metal base or a resin base, and the abrasive disc working layer includes a metal abrasive disc and a resin abrasive disc.

[0005] The present invention is further provided that the metal base and the resin base are both provided with positioning grooves.

[0006] The present invention is further provided that the metal abrasive disc is welded to the metal base, and the resin abrasive disc is embedded in the positioning groove of the resin base through an adhesive.

[0007] The present invention is further provided that the metal abrasive disc selects 65Mn steel plate as the base material of the metal abrasive disc, and the resin abrasive disc uses nylon plus fiber as the base material of the resin abrasive disc.

[0008] The further setting of the present invention is that the working layer of the metal grinding disc uses diamond abrasives with a particle size of 40 - 50 mesh, and copper - tin alloy (Cu / Sn ratio is 80:20) as the metal binder, and the two are mixed and made according to...;

[0009] The working layer of the resin grinding disc uses diamond abrasives with a particle size of 80 - 100 mesh, epoxy resin binder and additives, and they are mixed and made;

[0010] The further setting of the present invention is that the manufacturing method of the metal grinding disc is as follows:

[0011] Use a milling machine and a lathe to process a 65Mn steel plate to produce a metal matrix with positioning grooves. The width tolerance of the positioning grooves is controlled within ±0.05 mm, and the depth tolerance is controlled within ±0.1 mm;

[0012] Perform fine grinding and polishing on the surface of the matrix to make its surface roughness reach Ra0.8 - Ra1.6 μm;

[0013] Mix the diamond abrasives and the copper - tin alloy metal binder evenly according to the set ratio, and make the working layer of the metal grinding disc through powder metallurgy sintering process;

[0014] During the sintering process, control the temperature between 850℃ - 900℃, the pressure is 20MPa - 30MPa, and the heat preservation time is 10 minutes; use silver soldering to weld the working layer of the metal grinding disc on the metal matrix;

[0015] The manufacturing method of the resin grinding disc is as follows:

[0016] Add nylon and fiber materials into an injection mold, and produce a resin matrix with positioning grooves through injection molding process. Control the mold temperature at 220℃ - 240℃, the injection pressure at 80MPa - 100MPa, and the holding pressure time at 10s - 15s;

[0017] Hot - press the working layer material of the grinding disc according to the design requirements. Control the hot - press temperature at 185℃, maintain the pressure at 1.96133MPa, and set the hot - press time at 30 minutes;

[0018] After cleaning the bonding surface of the working layer of the resin grinding disc, select an epoxy resin binder, evenly apply the prepared binder on the bonding surface of the grinding disc main body, control the coating thickness within 0.5 mm, embed the working layer of the grinding disc into the positioning grooves of the resin matrix, and let it stand for 24H in an environment with a temperature of 25℃ - 30℃ and a humidity < 20% to wait for the binder to cure.

[0019] The present invention is further configured to include a chuck body, an outer portion of the chuck body is fixedly connected with a metal sheet, a plurality of card slots are provided on the chuck body, and the grinding disc body is installed in the card slots.

[0020] The present invention is further configured such that a plurality of positioning holes are provided on an outer portion of the chuck body, and the chuck body is made of cemented carbide.

[0021] The beneficial effects of the present invention are as follows: In the present invention, it mainly consists of a grinding disc body and a chuck body, without too many cumbersome components and complex connection methods, which not only reduces the manufacturing cost, but also makes the overall appearance more simple and generous, and is easy for users to understand and operate. Moreover, the design of embedding the grinding disc body into the chuck body makes the connection between the two tight and stable. During the grinding and polishing process, it can effectively transmit power, ensure the working efficiency and grinding quality of the grinding disc. At the same time, this embedded structure avoids problems such as loosening and displacement of the grinding disc during use, improving the reliability and stability of the entire device. By using the embedded card slots on the chuck body to assemble metal grinding discs or resin grinding discs, no special tools are required. Users only need to align the grinding disc with the card slot and insert or pull it out to complete the installation and replacement. This convenient operation method greatly saves time and labor costs and is convenient for replacement. Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of the present invention;

[0023] Figure 2 is a three-dimensional structural diagram of the present invention;

[0024] Figure 3 is a schematic bottom view structural diagram of the present invention;

[0025] Figure 4 is a schematic bottom view structural diagram of the chuck body in the present invention;

[0026] Figure 5 is a schematic structural diagram of a chuck body with another shape in the present invention;

[0027] Figure 6 is an exploded structural diagram of the chuck body and the grinding disc body in the present invention;

[0028] Figure 7 is a schematic bottom view structural diagram of the chuck body and the grinding disc body in the present invention.

[0029] The labels in the figure are:

[0030] 1. Chuck body; 2. Card slot; 3. Positioning hole; 4. Grinding disc working layer; 5. Grinding disc base body; 6. Positioning groove; 7. Metal sheet. Detailed Embodiment

[0031] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "front", "upper", "lower", "left", "right", "vertical", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0032] The following will further describe the present invention with reference to the Figure 1-7 accompanying drawings.

[0033] To solve the problems existing in the background art, the present application proposes the following technical solution: An embedded floor grinding machine chuck and grinding disc, including a chuck body 1 and a grinding disc body. The chuck body 1 is made of cemented carbide. A plurality of positioning holes 3 are arranged on the outside of the chuck body 1. A metal sheet 7 is fixedly connected to the outside of the chuck body 1. A plurality of card slots 2 are provided on the chuck body 1. The grinding disc body is installed in the card slots 2. The grinding disc body includes a grinding disc base body 5 and a grinding disc working layer 4. The grinding disc base body 5 is a metal base body or a resin base body. The grinding disc working layer 4 includes a metal grinding disc and a resin grinding disc. Thus, the present invention is mainly composed of the grinding disc body and the chuck body 1, without too many cumbersome parts and complex connection methods, which not only reduces the manufacturing cost, but also makes the overall appearance more concise and generous, and is easy for users to understand and operate. Moreover, the design of embedding the grinding disc body into the chuck body 1 makes the connection between the two tight and stable. During the grinding and polishing process, it can effectively transmit power, ensure the working efficiency and grinding quality of the grinding disc. At the same time, this embedded structure avoids problems such as loosening and displacement of the grinding disc during use.

[0034] Among them, the metal base body and the resin base body are both provided with positioning grooves 6. The metal grinding disc is welded to the metal base body. The resin grinding disc is embedded in the positioning groove 6 of the resin base body through an adhesive.

[0035] Among them, the metal grinding disc selects 65Mn steel plate as the base material of the metal grinding disc, and the resin grinding disc uses nylon plus fiber as the base material of the resin grinding disc.

[0036] Among them, the metal grinding disc working layer 4 uses diamond abrasive with a particle size of 40-50 mesh, and copper-tin alloy (Cu / Sn ratio of 80:20) as the metal binder, and the two are mixed and made according to; the resin grinding disc working layer 4 uses diamond abrasive with a particle size of 80-00 mesh, epoxy resin adhesive and additives, and is mixed and made.

[0037] The manufacturing method of the metal grinding disc is as follows:

[0038] The 65Mn steel plate is processed using a milling machine and a lathe to produce a metal matrix with a positioning groove 6. The width tolerance of the positioning groove 6 is controlled within ±0.05 mm, and the depth tolerance is controlled within ±0.1 mm.

[0039] The surface of the matrix is finely ground and polished to make its surface roughness reach Ra0.8 - Ra1.6 μm.

[0040] The diamond abrasive and the copper-tin alloy metal binder are mixed evenly according to the set ratio, and a metal grinding disc working layer 4 is made through powder metallurgy sintering process.

[0041] During the sintering process, the temperature is controlled between 850 °C and 900 °C, the pressure is 20 MPa - 30 MPa, and the heat preservation time is 10 minutes; to ensure the hardness, density and the bonding strength of diamond particles of the working layer. After the sintered working layer is tested, the hardness reaches HRC50 - 55, and the density is 7.5 g / cm 3 - 8.0 g / cm 3 , meeting the quality requirements.

[0042] Welding connection: The metal grinding disc working layer 4 is welded to the metal matrix using silver soldering. During welding, by adjusting the welding current and welding time, ensure the full fusion of the welding part and avoid defects such as false soldering and air holes. After welding, the weld is subjected to X-ray inspection and ultrasonic inspection, and the flaw detection grade of the weld reaches above grade II, ensuring that the connection strength between the working layer and the matrix can meet the requirements of high-load grinding.

[0043] Among them,

[0044] The manufacturing method of the resin grinding disc is as follows:

[0045] The nylon plus fiber material is added to an injection mold, and a resin matrix with a positioning feeding groove is made through injection molding process. Control the mold temperature at 220 °C - 240 °C, the injection pressure at 80 MPa - 100 MPa, and the holding pressure time at 10 s - 15 s to ensure the dimensional accuracy and surface quality of the resin matrix. After the formed resin matrix undergoes appearance inspection and dimensional measurement, the qualified rate reaches over 99%.

[0046] The material of the grinding disc working layer 4 is hot-pressed and formed according to the design requirements. The hot-pressing temperature is controlled at 185 °C, the pressure is maintained at 1.96133 MPa, and the hot-pressing time is set at 30 minutes, so that the nylon non-hooking reinforced base cloth is accurately embedded into the main working layer of the grinding disc by 2.5 mm, ensuring their close integration.

[0047] After cleaning the bonding surface of the working layer 4 of the resin grinding disc, select an epoxy resin adhesive and prepare it according to the requirements of the product instruction manual. Apply the prepared adhesive evenly on the bonding surface of the grinding disc body, and control the coating thickness within the range of 0.5 mm. Embed the working layer 4 of the grinding disc into the positioning groove 6 of the resin matrix, and leave it static for 24H in an environment with a temperature of 25°C - 30°C and a humidity of <20%, waiting for the adhesive to cure.

[0048] Among them, the manufacturing method of the chuck body 1 is as follows:

[0049] Use a CNC machining center to perform cutting processing on the cemented carbide material to manufacture the chuck body 1. During the processing, strictly control the dimensional accuracy and geometric tolerance of each part according to the design drawing to ensure the quality and performance of the chuck body 1. For example, the position tolerance of the positioning hole 3 is controlled within ±0.02 mm, and the flatness tolerance is controlled within ±0.01 mm.

[0050] On the body of the chuck body 1, use a milling machine to open 6 embedded slots 2;

[0051] Precisely control the shape, size, and position accuracy of the slot 2. The inner wall of the slot 2 is finely polished and processed, and the surface roughness reaches Ra0.4 - Ra0.8 μm. The fit clearance is controlled between 0.05 mm - 0.1 mm, which is convenient for the installation and disassembly of the grinding disc.

[0052] Use a drill press to machine a concave positioning hole 3 with a diameter of 4.5 mm on the connecting body. Use a coordinate boring machine to perform precision machining and calibration on the positioning hole 3 to ensure that the position accuracy of the positioning hole 3 reaches within ±0.01 mm, improving the working accuracy and stability of the entire grinding and polishing system;

[0053] Among them, both the metal matrix and the resin matrix are provided with positioning grooves, which cooperate with the embedded slots 2 of the chuck body 1 to unify the installation methods of different types of grinding discs such as metal grinding discs, resin grinding discs, and polishing discs. Grinding pressure adjustment: There are 6 embedded slots 2 opened on the chuck body 1. The grinding pressure can be adjusted by adjusting the number of assembled grinding discs, solving the influence of the contact area between the diamond grinding disc and the floor on the sharpness and durability of the grinding disc. This adjustable design can flexibly adjust the grinding pressure according to different grinding requirements and ground conditions, optimize the grinding effect, extend the service life of the grinding disc, and improve work efficiency and quality.

[0054] Experimental example:

[0055] Align the manufactured metal grinding disc or resin grinding disc with the embedded slot 2 on the chuck body 1, and gently tap it with a rubber hammer until the grinding disc is completely embedded in the slot 2 to ensure the relative position accuracy between the grinding disc and the chuck body 1.

[0056] Grinding pressure adjustment test: According to the material and roughness of the floor, select different numbers of metal grinding discs or resin grinding discs and install them on the chuck body 1 for grinding pressure adjustment test;

[0057] Measure the actual pressure during the grinding process through a professional pressure sensor, compare it with the preset pressure and make adjustments. It is determined that in the rough grinding stage, 2 - 3 metal grinding discs are installed on each chuck body 1, and the grinding pressure is 0.015 MPa - 0.02 MPa per square meter;

[0058] In the fine grinding stage, 6 resin grinding discs are installed on each chuck body 1, and the grinding pressure is 0.04 MPa - 0.05 MPa per square meter, thus providing an accurate reference basis for adjusting the wear resistance and sharpness of the diamond grinding disc.

[0059] Equipment connection and overall commissioning: Connect the chuck body 1 with the installed grinding disc to the floor grinding machine. After checking that the connection part is firm and reliable, start the grinding equipment and run it at a lower speed first. Observe the running condition of the grinding disc. No abnormal vibration, noise or heating phenomenon is found. At the same time, check the performance indicators of the grinding equipment, all of which are within the normal range. Fine-tune the parameters of the equipment according to the actual situation to make the parameters such as grinding speed and walking speed reach the best match, and formulate the best grinding and polishing construction process.

[0060] The specific experiment is as follows:

[0061] A large shopping mall newly laid a granite floor, but there are certain unevenness and defects on the floor surface, which need to be ground and polished to achieve a smooth, flat and beautiful effect to meet the use requirements of the normal business of the shopping mall.

[0062] Rough grinding stage: Use the grinding equipment installed with metal grinding discs to rough grind the newly laid granite floor. Set the grinding speed at 1500 r / min - 2000 r / min and the walking speed at 5 m / min - 8 m / min. During the rough grinding process, closely observe the grinding condition of the grinding disc and the change of the floor surface, and adjust the grinding parameters in time. After 2 - 3 passes of rough grinding, the unevenness of the floor surface has been significantly improved, and most of the defects have been removed, but there are still some relatively shallow scratches left.

[0063] Transition stage: After the rough grinding is completed, replace it with a resin grinding disc with a particle size of 80 / 100 mesh for transitional grinding. Adjust the grinding speed to 1200 r / min - 1500 r / min and the walking speed to 3 m / min - 5 m / min. During the fine grinding process, strictly control the grinding speed and walking speed to ensure the consistency of the grinding effect. After grinding for 1 - 2 passes, stop the machine to check the wear condition of the grinding disc and find that the wear of the grinding disc is relatively uniform and there is no need to replace the grinding disc.

[0064] Fine grinding stage: After the transition is completed, finer-grained resin grinding discs or polishing discs are used for fine grinding and polishing. The grinding speed is reduced to 800 r / min - 1000 r / min, and the pressure is more uniform, at 0.1 MPa - 0.2 MPa. After 2 - 3 passes of fine grinding and polishing, the floor surface reaches a smooth and flat effect, and the glossiness detection reaches above 80 GU, meeting the usage requirements of the shopping mall.

[0065] Grinding disc maintenance and replacement: After each use of the grinding disc, clean and inspect the grinding disc in a timely manner. Use a high-pressure water gun to rinse the grinding debris and dirt on the surface of the grinding disc, and then check the wear degree and whether there are any damaged phenomena of the grinding disc. After multiple uses, it is found that some metal grinding discs show slight wear, and the wear of the resin grinding disc does not affect. For severely worn or damaged grinding discs, they need to be replaced in a timely manner to ensure the grinding quality and the normal operation of the equipment. At the same time, regularly inspect and maintain the chuck body 1, clean the sundries in the clamping groove 2 and the positioning hole 3, and check whether its accuracy meets the requirements to ensure its normal use and extend the service life of the chuck body 1 and the diamond grinding disc.

[0066] In this embodiment, it mainly consists of a grinding disc body and a chuck body 1, without too many cumbersome parts and complex connection methods. This not only reduces the manufacturing cost but also makes the overall appearance more concise and generous, which is easy for users to understand and operate. Moreover, the design of embedding the grinding disc body into the chuck body 1 makes the connection between the two tight and stable. During the grinding and polishing process, it can effectively transmit power, ensuring the working efficiency and grinding quality of the grinding disc. At the same time, this embedded structure avoids problems such as loosening and displacement of the grinding disc during use, improving the reliability and stability of the entire device. The metal grinding disc or resin grinding disc is assembled through the embedded clamping groove 2 on the chuck body 1, without the need for special tools. The user only needs to align the grinding disc with the clamping groove 2 and insert or pull it out to complete the installation and replacement. This convenient operation method greatly saves time and labor costs, especially suitable for work scenarios that require frequent replacement of grinding discs, and can significantly improve work efficiency. Precise positioning: The concave positioning hole 3 with a depth of 4.5 mm opened on the chuck body 1 can ensure that the grinding disc is accurately positioned at the predetermined position during installation. This guarantees the relative position accuracy between the grinding disc and the chuck body 1, thereby improving the working accuracy and stability of the entire grinding and polishing system, and effectively avoiding problems such as poor grinding effect or equipment damage caused by inaccurate installation position of the grinding disc.

[0067] Both the metal matrix and the resin matrix are provided with positioning grooves, which cooperate with the embedded card slots 2 of the chuck body 1, unifying the installation methods of different types of grinding discs such as metal grinding discs, resin grinding discs, and polishing discs. Grinding pressure adjustment: The embedded card slots 2 are provided in the chuck body 1 in a number of 6, and the grinding pressure can be adjusted by adjusting the assembly quantity of the grinding disc, solving the influence of the contact area between the diamond grinding disc and the floor on the sharpness and durability of the grinding disc. This adjustable design can flexibly adjust the grinding pressure according to different grinding requirements and ground conditions, optimize the grinding effect, extend the service life of the grinding disc, and improve work efficiency and quality.

[0068] In summary, this floor diamond grinding disc and the chuck body 1 have significant advantages in terms of structure, installation and replacement, versatility, and grinding disc performance, and can better meet the working requirements of floor grinding and polishing, improve work efficiency and quality, and reduce costs and maintenance difficulties.

[0069] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0070] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An embedded floor grinding machine grinding disc, characterized in that: The abrasive disc comprises a grinding disc main body, wherein the grinding disc main body comprises a grinding disc base (5) and a grinding disc working layer (4), the grinding disc base (5) is a metal base or a resin base, and the grinding disc working layer (4) comprises a metal grinding disc and a resin grinding disc.

2. The embedded floor grinding machine grinding disc according to claim 1, characterized in that: The metal matrix and the resin matrix are both provided with positioning grooves (6).

3. The embedded floor grinding machine grinding disc according to claim 2, characterized in that: The metal grinding disc is welded on the metal matrix, and the resin grinding disc is embedded in the positioning groove (6) of the resin matrix through an adhesive.

4. The embedded floor grinding machine grinding disc according to claim 3, characterized in that: The metal grinding disc uses 65Mn steel plate as the base material of the metal grinding disc, and the resin grinding disc uses nylon plus fiber as the base material of the resin grinding disc.

5. The embedded floor grinding machine grinding disc according to claim 4, characterized in that: The metal grinding disc working layer (4) is made of diamond abrasive with a particle size of 40-50 mesh and copper-tin alloy (Cu / Sn ratio is 80:20) as a metal binder, and the two are mixed and manufactured according to the method; The resin grinding disc working layer (4) is made of diamond abrasive with a particle size of 80-00 mesh, epoxy resin adhesive and additives, and is mixed and manufactured.

6. The embedded floor grinding machine grinding disc according to claim 5, characterized in that: The manufacturing method of the metal grinding disc is as follows: The 65Mn steel plate is processed by a milling machine and a lathe to produce a metal matrix with a positioning groove. The width tolerance of the positioning groove is controlled within ±0.05mm, and the depth tolerance is controlled within ±0.1mm. Fine grinding and polishing of the substrate surface to make its surface roughness reach Ra0.8-Ra1.6μm; The diamond abrasive and the copper-tin alloy metal binder are uniformly mixed according to a set ratio, and a metal abrasive disc working layer is prepared by a powder metallurgy sintering process; During the sintering process, the temperature is controlled between 850℃-900℃, the pressure is 20MPa-30MPa, and the holding time is 10 minutes; the working layer of the metal grinding disc is welded to the metal substrate by silver welding; The manufacturing method of the resin grinding disc is as follows: Add nylon plus fiber material into the injection mold, and make a resin matrix with positioning grooves through injection molding process, control the mold temperature to 220℃-240℃, the injection pressure to 80MPa-100MPa, and the holding time to 10s-15s; The working layer material of the grinding disc is hot-pressed according to the design requirements, the hot-pressing temperature is controlled at 185°C, the pressure is maintained at 1.96133MPa, and the hot-pressing time is set to 30 minutes; After cleaning the bonding surface of the resin grinding disc working layer, select epoxy resin adhesive and evenly apply the prepared adhesive on the bonding surface of the grinding disc body. The coating thickness is controlled within the range of 0.5mm. The grinding disc working layer is embedded in the positioning groove of the resin matrix and left to stand for 24 hours in an environment with a temperature of 25℃-30℃ and a humidity of <20% to wait for the adhesive to solidify.

7. An embedded floor grinding machine chuck as claimed in any one of claims 1 to 5, characterized in that: It comprises a chuck body (1), the outside of which is fixedly connected with a metal sheet (7), the chuck body (1) is provided with a plurality of groups of slots (2), and the grinding sheet body is installed in the slots (2).

8. The embedded floor grinding machine chuck according to claim 7, characterized in that: A plurality of groups of positioning holes (3) are arranged on the outside of the chuck body (1), and the chuck body (1) is made of hard alloy.

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