CN219979250U

CN219979250U - Ceramic resistor and CNC tool bit

Info

Publication number: CN219979250U
Application number: CN202320937675.3U
Authority: CN
Inventors: 赖东禹; 蒋先军; 刘海强
Original assignee: Weidali Technology Co ltd
Current assignee: Weidali Technology Co ltd
Priority date: 2023-04-24
Filing date: 2023-04-24
Publication date: 2023-11-07
Anticipated expiration: 2033-04-24

Abstract

The utility model relates to a ceramic resistor and a CNC tool bit. According to the ceramic resistor, the first round chamfer is arranged between the end faces of the two ends of the resistor body and the outer side face of the resistor body, so that the first electrode layer and the second electrode layer are plated on the end faces of the two ends, and after the first insulating protective layer is brushed on the outer side face, the two ends of the first insulating protective layer are respectively connected with the first electrode layer and the second electrode layer at the first round chamfer, the connection integrity can be improved, the ceramic resistor can be prevented from being ignited under multiple high-voltage pulses, and the compressive strength and the resistance stability of the ceramic resistor are improved. Above-mentioned CNC tool bit includes machined part and installed part, and the machined part includes grinding post, first end dish and second end dish, is the fillet transition between the periphery of first end dish and second end dish and the lateral surface of grinding post, and above-mentioned CNC tool bit can directly handle into the ceramic sample of irregularity and take the appointed size semi-manufactured goods of chamfer, has simplified production technological process, has improved work efficiency.

Description

Ceramic resistor and CNC tool bit

Technical Field

The utility model relates to the technical field of electronic components, in particular to a ceramic resistor and a CNC tool bit capable of being used for machining the ceramic resistor.

Background

Compared with the traditional resistor, the solid ceramic resistor has wider application prospect in the application fields of buffer circuits, soft start, surge, precharge and the like. Fig. 1 shows a conventional resistor body of a solid ceramic resistor. The resistor body 10 has a circular column structure, and is coated with insulating oil as an insulating protective layer on the outer side 13 thereof by copper plating and other metals on the end surfaces (the first end surface 11 and the second end surface 12) at the two ends thereof as electrode layers, so as to achieve the effects of section conduction and side insulation. Through researches, the electrode layer and the insulating protective layer are difficult to be completely attached in actual production, contact resistance can be generated in the similar-connection and non-connection state of the electrode layer and the insulating protective layer, voltage is increased to cause the insulating protective layer to be in short circuit instantly, the contact surface is overheated at first, and the phenomenon of spark generation easily occurs when heating is serious. From the aspect of macroscopic manifestation, the resistor has the problems of ignition, lower withstand voltage, poorer resistance stability and the like under high-voltage pulse.

Disclosure of Invention

Based on this, it is necessary to provide a ceramic resistor and a CNC tool bit that can be used to process the ceramic resistor to solve the problems of the resistor that the resistor is ignited under high voltage pulse, the withstand voltage is low, and the resistance stability is poor.

One of the purposes of the utility model is to provide a ceramic resistor, which is characterized in that:

a ceramic resistor comprising:

the resistor comprises a resistor body, wherein the resistor body is of a cylinder structure, the resistor body is provided with two end faces which are oppositely arranged and an outer side face which is positioned between the two end faces, and the connection parts between the two end faces and the outer side face are respectively provided with a first round chamfer;

the first electrode layer and the second electrode layer are respectively arranged on the end surfaces of the two ends of the resistor body; and

the first insulating protection layer is arranged on the outer side face of the resistor body, and two ends of the first insulating protection layer along the axial direction of the resistor body are respectively connected with the first electrode layer and the second electrode layer at the first round chamfer.

In some embodiments, the resistor body is provided with a hollow hole, the hollow hole penetrates through the two end surfaces of the resistor body, and the connection parts between the two end surfaces of the resistor body and the wall of the hollow hole are respectively provided with a second round chamfer;

the ceramic resistor further comprises a second insulating protection layer, the second insulating protection layer is arranged on the wall of the hollow hole, and two ends of the second insulating protection layer along the axial direction of the resistor body are respectively connected with the first electrode layer and the second electrode layer at the second round chamfer.

In some of these embodiments, the diameter of the first rounded chamfer and/or the second rounded chamfer is 0.5mm to 4mm.

In some embodiments, the radian of the first circular chamfer and/or the second circular chamfer is pi/36-pi/2.

Another object of the present utility model is to provide a CNC tool bit capable of being used for manufacturing the ceramic resistor, which comprises the following steps:

a CNC tool bit, comprising:

the machining part comprises a grinding column, a first end disc and a second end disc, wherein the first end disc and the second end disc are respectively connected to two ends of the grinding column and are coaxially arranged with the grinding column, in the radial direction, the first end disc and the second end disc protrude out of the grinding column, and the peripheries of the first end disc and the second end disc and the outer side surface of the grinding column are in round angle transition; and

and the mounting piece is connected with one end of the first end disc, which is far away from the grinding column.

In some embodiments, the fillet diameter of the fillet transition is 0.5mm to 4mm and the fillet radian is pi/36 pi/2.

In some of these embodiments, the roughness of the outer side of the grinding column is 13 μm to 75 μm.

In some of these embodiments, the end of the second end disk remote from the grinding post is provided with a junk slot.

In some embodiments, the junk slot comprises a plurality of sub-slots divergently extending from a center of an end of the second end disk remote from the grinding column and opening at an edge of the second end disk.

In some embodiments, the width of the sub-grooves is 1 mm-5 mm, and the depth is 1 mm-5 mm.

The chip removal groove further comprises a middle groove, the middle groove is located in the center of one end, far away from the grinding column, of the second end disc, and the depth of the middle groove is larger than that of the sub groove.

Compared with the traditional scheme, the ceramic resistor and the CNC tool bit have the following beneficial effects:

it has been found that the reason for causing the resistor to strike fire, withstand voltage lower and resistance stability poorer under high voltage pulse is that the electrode layer plated on the end faces of the two ends of the resistor body and the first insulating protective layer brushed on the outer side face generate contact resistance because complete bonding is difficult to realize. The ceramic resistor improves the structure of the resistor body, and the first round chamfer is arranged between the end surfaces of the two ends of the resistor body and the outer side surface of the resistor body, so that after the first electrode layer and the second electrode layer are plated on the end surfaces of the two ends and the first insulating protective layer is brushed on the outer side surface, the two ends of the first insulating protective layer are respectively connected with the first electrode layer and the second electrode layer at the first round chamfer, the connection integrity degree can be improved, the ceramic resistor can be prevented from being ignited under multiple high-voltage pulses, and the compressive strength and the resistance stability of the ceramic resistor are improved.

When the resistor body of the ceramic resistor is processed, the outer side surface of the resistor body is subjected to surrounding grinding through the grinding column of the CNC tool bit. Simultaneously, the first end disc is abutted against one end face of the resistor body, and a round angle between the first end disc and the outer side face of the grinding column can be used for chamfering the resistor body to obtain a first round chamfer; or, the second end disc is abutted against the other end face of the resistor body, and the round angle between the second end disc and the outer side face of the grinding column can be used for chamfering the resistor body to obtain a first round chamfer. By adopting the CNC tool bit, irregular ceramic samples can be directly processed into semi-finished products with designated sizes and chamfering, the production process flow is simplified, and the working efficiency is improved. The ceramic is processed by adopting the CNC tool bit with the arc chamfer surface, so that the chamfer is smoother and finer, and the follow-up process of brushing insulating paint is convenient.

Drawings

Fig. 1 is a schematic structural view of a resistor body in a conventional ceramic resistor, wherein (a) is a front view and (b) is a top view;

FIG. 2 is a schematic diagram of a resistor body in a ceramic resistor according to an embodiment of the utility model, wherein (a) is a front view and (b) is a top view;

FIG. 3 is a schematic view of a CNC tool bit according to an embodiment of the present utility model;

FIG. 4 is a schematic view of the CNC tool bit of FIG. 3 from another perspective;

FIG. 5 is a schematic view of a second end plate of the CNC tool bit of FIG. 3.

Reference numerals illustrate:

100. a resistor body; 110. a first end face; 120. a second end face; 130. an outer side surface; 140. a first round chamfer; 150. a hollow hole; 160. a second round chamfer; 200. CNC tool bit; 210. a work piece; 211. grinding the column; 212. a first end plate; 213. a second end plate; 2132. a sub-trench; 2134. a middle groove; 220. and a mounting member.

Detailed Description

In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. Preferred embodiments of the present utility model are shown in the drawings. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

In the description of the present utility model, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

The ceramic resistor of an embodiment comprises a resistor body, a first electrode layer, a second electrode layer and an insulating protection layer.

Referring to fig. 2, the resistor body 100 has a pillar structure. The resistor body 100 has opposite end faces, a first end face 110 and a second end face 120, and an outer side face 130 between the end faces. The junction between the end surfaces of the two ends of the resistor body 100 and the outer side surface 130 is provided with a first round chamfer 140 respectively. The first electrode layer and the second electrode layer are respectively disposed on both end surfaces of the resistor body 100.

The first insulating protection layer is disposed on the outer side 130 of the resistor body 100. Both ends of the first insulating protection layer are connected with the first electrode layer and the second electrode layer at the first rounded corners 140, respectively.

The ceramic resistor improves the structure of the resistor body 100, and a first round chamfer 140 is arranged between the end surfaces of the two ends of the resistor body 100 and the outer side surface 130 thereof, so that after the first electrode layer and the second electrode layer are plated on the end surfaces of the two ends and the outer side surface 130 is coated with a first insulating protection layer, the first insulating protection layer is respectively connected with the first electrode layer and the second electrode layer at the first round chamfer 140 along the two ends of the axial direction of the resistor body, the connection integrity degree can be improved, the ceramic resistor can be prevented from being ignited under multiple high-voltage pulses, and the compressive strength and the resistance stability of the ceramic resistor are improved.

In addition, the first round chamfer 140 is arranged between the end surfaces of the two ends of the resistor body 100 and the outer side surface 130 of the resistor body, so that the margin between the electrode layer and the resistor body 100 can be increased, the edge defect can be reduced, the scrapping condition of products caused by collision in production can be reduced, and the qualification rate and the working efficiency of the production process can be improved.

Alternatively, the diameter of the first circular chamfer 140 may be, for example, but not limited to, 0.5mm to 4mm, specifically, for example, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, etc. The diameter of the first rounded corners 140 is within the above range, enabling the first insulating protection layer to be better connected with the first electrode layer and the second electrode layer.

Alternatively, the curvature of the first rounded chamfer 140 may be, for example, but not limited to, pi/36 pi/2. Further, the radian of the first round chamfer 140 is pi/6 to pi/2, specifically, pi/6, pi/5, pi/4, pi/3, pi/2, etc. The curvature of the first rounded corners 140 is within the above range, enabling the first insulating protection layer to be better connected with the first electrode layer and the second electrode layer.

In some of these examples, resistor body 100 is a circular cylinder structure. More specifically, the resistor body 100 has a hollow hole 150, and the hollow hole 150 penetrates through both end surfaces of the resistor body 100. In this example, the connection between the end surfaces of the two ends of the resistor body 100 and the wall of the hollow hole 150 has second rounded corners 160, respectively.

Further, the ceramic resistor further includes a second insulating protection layer disposed on the wall of the hollow hole 150. The second insulating protection layer is connected to the first electrode layer and the second electrode layer at the second rounded corner 160 along two ends of the resistor body in the axial direction.

Alternatively, the diameter of the second rounded chamfer 160 may be, for example, but not limited to, 0.5mm to 4mm, specifically, for example, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, etc. The diameter of the second rounded corners 160 is within the above range, enabling the second insulating protection layer to be better connected with the first electrode layer and the second electrode layer.

Optionally, the second rounded chamfer 160 has an arc of pi/36 pi/2. Further, the second rounded chamfer 160 has an arc of pi/6 to pi/2, specifically, pi/6, pi/5, pi/4, pi/3, pi/2, etc. The curvature of the second rounded corners 160 is within the above range, enabling the second insulating protection layer to be better connected with the first electrode layer and the second electrode layer.

Further, referring to fig. 3 and 4, the present utility model further provides a CNC tool bit 200 that can be used to manufacture the ceramic resistor.

The CNC tool tip 200 of one embodiment includes a work piece 210 and a mount 220.

The workpiece 210 includes a grinding post 211, a first end plate 212, and a second end plate 213. The first end plate 212 and the second end plate 213 are connected to both ends of the grinding column 211, respectively, and are disposed coaxially with the grinding column 211. In the radial direction, both the first end plate 212 and the second end plate 213 protrude from the grinding column 211. Rounded transitions are provided between the peripheral edges of the first and second end plates 212, 213 and the outer side 130 of the grinding post 211. The first end disk 212 defines a rounded corner surface a and the second end disk 213 defines a rounded corner surface B. The mounting member 220 is connected to an end of the first end plate 212 remote from the grinding post 211 for connection mounting with the CNC device body.

When the resistor body 100 of the ceramic resistor is processed, the outer surface 130 of the resistor body 100 is ground around by the grinding pillars 211 of the CNC bit 200. Meanwhile, the first end disc 212 is abutted against one end face of the resistor body 100, and a round angle between the first end disc 212 and the outer side face 130 of the grinding column 211 can be used for chamfering the resistor body 100 to obtain a first round chamfer 140; alternatively, the second end plate 213 is brought into contact with the other end surface of the resistor body 100, and the rounded corner between the second end plate 213 and the outer side surface 130 of the grinding post 211 can chamfer the resistor body 100 to obtain the first rounded corner 140.

In addition, for the resistor body 100 of the annular cylinder structure, the workpiece 210 may also extend into the hollow hole 150 of the workpiece, the hole wall of the hollow hole 150 is ground in a surrounding manner, and the second round chamfer 160 is formed between the hole wall and the end face of the hollow hole 150.

By adopting the CNC tool bit 200, irregular ceramic samples can be directly processed into semi-finished products with designated sizes and chamfer angles, so that the production process flow is simplified, and the working efficiency is improved. The CNC tool bit 200 with the arc chamfer faces is used for processing ceramics, so that the chamfer is smoother and finer, and the follow-up insulating paint brushing process is convenient.

The grinding column 211 has a cylindrical structure. The outer side 130 is an arc surface and has a certain roughness, for example, the roughness may be, but not limited to, 13 μm to 75 μm, and may be specifically determined according to the hardness and the chamfering radian of the resistor body 100. In production practice, the surface roughness of the tool bit is also customary to use the mesh number as a measure, for example, 13 μm to 75 μm is 200 mesh to 1000 mesh.

Alternatively, the fillet diameters between the first and second end plates 212, 213 and the grinding column 211 may be, for example, but not limited to, 0.5mm to 4mm, specifically, for example, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, etc.

Alternatively, the rounded curvature between the first and second end plates 212, 213 and the grinding column 211 may be, for example, but not limited to, pi/36-pi/2, specifically, pi/6, pi/5, pi/4, pi/3, pi/2, etc., for example.

The resistor body 100 processed by the CNC tool bit 200 may be further sanded and polished with sandpaper. The mesh number of the sand paper can be specifically determined according to the hardness of the product and the radian of the round chamfer, for example, the mesh number ranges from 200 meshes to 1000 meshes. Adopt frosting and sand paper of different mesh numbers to handle the round chamfer, can prolong CNC tool bit 200's life, save the cost.

The end of the second end plate 213 remote from the grinding post 211 may also be used to reduce the thickness of the workpiece. The end face is planar and has a roughness, which may be, for example, but not limited to, 13 μm to 75 μm, the specific roughness of which may depend on the hardness and chamfer radians of the product.

As shown in fig. 4 and 5, in some of these examples, the end of the second end plate 213 remote from the grinding post 211 is provided with junk slots. By providing the chip removal groove, the ceramic chip at the surface in the machining process can be smoothly discharged, so that the CNC tool bit 200 is prevented from being blocked by the ceramic chip, and the equipment is halted.

Further, the chip removal groove includes a plurality of sub grooves 2132, the plurality of sub grooves 2132 divergently extending from the center of the end of the second end plate 213 remote from the grinding post 211 and opening at the edge of the second end plate 213. In the particular example illustrated, the plurality of sub-grooves 2132 comprise a cross-type structure.

Further, the chip removal groove further includes a middle groove 2134, the middle groove 2134 being located at the center of the end of the second end plate 213 remote from the grinding post 211, i.e., at the position where the plurality of sub-grooves 2132 meet, the depth of the middle groove 2134 being greater than the depth of the sub-grooves 2132 to provide better chip removal at that position.

Alternatively, the width of the junk slot may be, for example, but not limited to, 1mm to 5mm, specifically, for example, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, etc. The depth of the chip removal groove may be, for example, but not limited to, 1mm to 5mm, specifically, for example, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, and the like. The depth of the intermediate groove 2134 is 2mm to 5mm greater than the depth of the sub-groove 2132.

The following examples are provided to illustrate the utility model, but the utility model is not limited to the following examples.

Example 1

The present embodiment provides a ceramic resistor, which includes a resistor body 100, a first electrode layer, a second electrode layer, a first insulating protection layer, and a second insulating protection layer.

The resistor body 100 has a circular column structure. The resistor body 100 has a first rounded chamfer 140 between the end surfaces of both ends and the outer side 130, respectively, with a diameter of 2mm and an arc of pi/2. The first electrode layer and the second electrode layer are respectively disposed on both end surfaces of the resistor body 100. The first insulating protection layer is disposed on the outer side 130 of the resistor body 100. Both ends of the first insulating protection layer are connected with the first electrode layer and the second electrode layer at the first rounded corners 140, respectively.

The resistor body 100 has second round chamfers 160 between the end surfaces of the two ends and the wall of the hollow hole 150, the diameter of the second round chamfers is 2mm, and the radian of the second round chamfers is pi/2. The second insulating protection layer is disposed on the wall of the hollow hole 150. Both ends of the second insulating protection layer are connected with the first electrode layer and the second electrode layer at the second rounded corners 160, respectively.

The preparation process of the ceramic resistor of the embodiment comprises the following steps:

step 1, adopting a numerical control machine (CNC) technology to carry out size normalization and chamfering treatment on the sintered ceramic sample to obtain the resistor body 100. The CNC tool bit 200 used is shown in fig. 3-5. The roughness of the grinding post 211 of the CNC tool bit 200 was 38 μm, the fillet diameter between the first and second end plates 212 and 213 and the grinding post 211 was 2mm, and the arc was pi/2. The roughness of the second end plate 213 is 38 μm, and the second end plate 213 is provided with a cross-shaped chip removal groove, the opening width is 2mm, and the depth is 3mm. After CNC processing, 400-mesh sand paper is adopted to polish the round corners.

And 2, plating copper on the end surfaces of the two ends of the resistor body 100 respectively to form a first electrode layer and a second electrode layer, and painting insulating paint on the outer side surface 130 and the wall of the hollow hole 150 to form a first insulating protection layer and a second insulating protection layer.

Through tests, the maximum peak voltage of the ceramic resistor prepared by the embodiment is 1kV, the resistance is 0.50Ω+/-5%, no ignition phenomenon exists under 10 times of 1kV high-voltage pulse, the metal copper surface is completely attached to the insulating paint surface, and the product percent of pass is 90%.

Comparative example 1

And adopting CNC technology to carry out size normalization treatment on the sintered irregular ceramic sample. The CNC tool bit is a cylindrical tool bit, so that a right angle is formed between the end face and the cambered surface in the obtained resistor body.

And (3) carrying out metal copper plating and insulating paint brushing treatment on the obtained resistor body to obtain the non-chamfer ceramic resistor.

Through tests, the maximum peak voltage of the ceramic resistor prepared by the embodiment is 700V, the resistance is 0.51Ω+/-12%, obvious ignition and blackening occur on the contact surface of the metal copper and the insulating paint under the high-voltage pulse of 700V for 10 times, and the product percent of pass is 75%.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. The scope of the utility model is, therefore, indicated by the appended claims, and the description may be intended to interpret the contents of the claims.

Claims

1. A ceramic resistor, comprising:

the resistor body is of a cylinder structure, and is provided with two end faces which are oppositely arranged and an outer side face which is positioned between the two end faces, and the connection parts between the two end faces and the outer side face are respectively provided with a first round chamfer;

2. The ceramic resistor of claim 1, wherein the resistor body has a hollow hole penetrating through both end surfaces of the resistor body, and the connection parts between the both end surfaces of the resistor body and the wall of the hollow hole have second round chamfers, respectively;

3. The ceramic resistor of claim 2, wherein the diameter of the first rounded chamfer and/or the second rounded chamfer is 0.5mm to 4mm.

4. A ceramic resistor according to claim 2 or 3, wherein the arc of the first and/or second rounded corners is/are 36-pi/2.

5. A CNC tool bit, comprising:

6. The CNC tool bit of claim 5, wherein the fillet transition has a fillet diameter of 0.5mm to 4mm and a fillet radian of pi/36 pi/2.

7. The CNC tool bit of claim 5, wherein the outer surface of the grinding post has a roughness of 13 to 75 μm.

8. The CNC tool head according to any one of claims 5 to 7, wherein the end of the second end disc remote from the grinding post is provided with a chip removal groove.

9. The CNC tool bit of claim 8, wherein the chip removal groove comprises a plurality of sub-grooves extending divergently outwardly from a center of an end of the second end disk remote from the grinding post and opening at an edge of the second end disk.

10. The CNC tool bit of claim 9, wherein the chip removal groove meets at least one of the following conditions:

(1) The chip removal groove further comprises a middle groove, the middle groove is positioned in the center of one end of the second end disc, which is far away from the grinding column, and the depth of the middle groove is larger than that of the sub groove;

(2) The width of the sub-groove is 1 mm-5 mm, and the depth is 1 mm-5 mm.