Heat treatment tool for oversize steel balls

Abstract

The utility model discloses a heat treatment tool for an oversize steel ball, which comprises a hollow annular base, liquid penetrating holes are uniformly distributed along the circumferential direction of the base, a chamfer is arranged at the upper end part of the inner ring surface of the base, liquid guide grooves are uniformly distributed on the chamfer of the inner ring surface of the base along the circumferential direction at intervals, and the oversize steel ball is placed on the base of the heat treatment tool. The steel ball is in loop contact with a chamfered ring surface at the upper end part of the inner ring surface of the base; the special tool for heat treatment of the oversize steel balls is manufactured according to the size sections of steel ball products, the liquid guide grooves and the liquid penetrating holes are reasonably formed in the tool, heat treatment of the steel balls is supported, original point contact between the steel balls and the tool is changed into loop contact, the contact area is increased, the steel balls cannot roll in the material disc transmission process, unbalance loading of the material disc is avoided, and the service life of the material disc is prolonged. And the stable operation of heat treatment equipment is ensured, the heating and cooling uniformity during quenching heat treatment of the steel balls is ensured, the cushion damage caused by large dead weight of the steel balls is avoided, and the product quality of the whole heat treatment of the steel balls is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of steel ball heat treatment, and particularly relates to a heat treatment tool for super-large steel balls. BACKGROUND

[0002] Steel balls are important basic components and are widely used in the fields of bearings, precision instruments, ball milling equipment and the like. As a key bearing component of rolling bearings, the steel ball acts as a rolling body in the bearing to bear and transmit load and rotates with the bearing. Since any point on the surface of the steel ball is a working surface bearing load, the contact area is small, the contact stress is large, and the steel ball is subjected to a relatively poor stress condition, and is prone to fatigue failure.

[0003] For example, super-large steel balls with a diameter greater than 150 mm need to be heat treated in a salt bath roller furnace. However, it is found in sample testing that the original tooling cannot meet the heat treatment requirements. Since the super-large steel balls are heavy, serious bruising occurs at the contact position between the steel ball and the tray during heating. Moreover, the steel ball rolls during transmission in the tray, which not only causes a large bruising area of the steel ball, but also affects the transmission stability of the tray, thereby affecting the product quality of the steel ball and the stable operation of the heat treatment equipment. If the amount of reserved material is increased to ensure the quality of the finished steel ball, the grinding efficiency will be greatly reduced, the material utilization rate will be greatly reduced, and the production cycle will be prolonged. SUMMARY

[0004] The utility model discloses a heat treatment tooling for super-large steel balls, which can stably place the steel ball by increasing special heat treatment tooling, ensure the flow of quenching liquid during quenching, avoid the eccentric load of the tray, solve the bruising and rolling problems of the super-large steel ball during heat treatment, improve the product quality of the steel ball heat treatment, and reduce the production cost.

[0005] The utility model discloses the technical scheme is as follows: a heat treatment tooling for super-large steel balls, including base, the base is hollow's circular ring, is evenly provided with the liquid -permeable hole along the circumference direction of base, the inner ring face upper end of base is equipped with the chamfer, the inner ring face chamfer of base is evenly equipped with the liquid guide groove along the circumference direction interval, super -large steel ball is placed on the base of heat treatment tooling, and the chamfer ring surface of the inner ring face upper end of base is annular contact with the steel ball.

[0006] The diameter size of the inner ring face of the base matches the diameter size of the cross section at 1 / 8 to 1 / 7 of the steel ball, and the diameter size of the outer side of the base matches the outer diameter size of the steel ball.

[0007] The chamfer of the inner ring upper end face of the base is at an angle of 45 degrees with the horizontal direction.

[0008] The liquid-permeable hole is a circular hole penetrating the base along the height direction of the base.

[0009] The liquid guide groove is a bevel structure, and the inner side surface of the liquid guide groove is a bevel surface inclined from top to bottom to the inner ring surface direction of the base, and the inclination angle of the bevel surface is an included angle of 45°-60° with the horizontal direction.

[0010] The number of the liquid guide grooves is the same as that of the liquid-permeable holes, and the positions of the liquid guide grooves and the liquid-permeable holes are alternately arranged.

[0011] The liquid-permeable holes are arranged along the circumferential direction of the base, and the inner ring surface upper end of the base is provided with a chamfer, and the chamfer of the inner ring surface of the base is provided with the liquid guide grooves arranged along the circumferential direction; the large steel ball is placed on the base of the heat treatment tool, and the chamfer ring surface of the inner ring surface upper end of the base is in line contact with the steel ball; the purpose of such arrangement is that the heat treatment tool is placed on the material disc, the steel ball is stably placed on the base of the heat treatment tool, the point contact between the steel ball and the material disc is changed into the line contact between the steel ball and the inner ring surface of the base, the contact area of the steel ball is increased, the steel ball is not damaged, and the steel ball does not roll in the transmission process of the material disc, the unbalanced load of the material disc is avoided, the smooth operation of the heat treatment equipment is ensured; in addition, the liquid-permeable holes are arranged along the circumferential direction of the base, the weight of the base is reduced without affecting the structure of the base, the flow of the quenching liquid is ensured, the quenching heat treatment of the steel ball is more uniform, and the product quality of the steel ball is effectively improved.

[0012] The diameter size of the inner ring surface of the base matches the diameter size of the cross section at 1 / 8-1 / 7 of the steel ball, and the outer diameter size of the base matches the outer diameter size of the steel ball; after the steel ball is placed on the base, a gap of 5-10 mm is left between the bottom of the steel ball and the lower end surface of the base; the purpose of such arrangement is that the diameter sizes of the inner ring surface and the outer ring surface of the base match the outer diameter size of the steel ball, so that the steel ball is stably and firmly placed on the base, the steel ball does not roll in the transmission process of the material disc, the unbalanced load of the material disc is avoided, and the smooth operation of the heat treatment equipment is ensured; the gap of 5-10 mm between the bottom of the steel ball and the lower end surface of the base is used for better flow of the quenching liquid, uniformity of the quenching of the steel ball is ensured, and the heat treatment quality of the steel ball product is improved.

[0013] The liquid guide groove is a bevel structure, and the inner side surface of the liquid guide groove is a bevel surface inclined from top to bottom to the inner ring surface direction of the base, and the inclination angle of the bevel surface is an included angle of 45°-60° with the horizontal direction; the purpose of such arrangement is that the steel ball is placed on the base of the heat treatment tool, and the contact position between the steel ball and the chamfer ring surface of the base is provided with the liquid guide grooves, which is beneficial to the flow of the quenching liquid at the contact position between the steel ball and the base of the special tool, and the heat treatment product quality of the steel ball is effectively improved.

[0014] The utility model discloses a special tool for super large steel ball heat treatment, which is characterized by the following technical scheme: a hollow circular ring-shaped base is provided with liquid-permeable holes uniformly distributed along the circumferential direction of the base; the inner ring surface of the base is provided with a chamfer at the upper end; liquid guide grooves are uniformly distributed along the circumferential direction of the chamfer; a super large steel ball is placed on the base; the chamfer of the upper end of the inner ring surface of the base is in annular line contact with the steel ball. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a top view structural schematic diagram of the heat treatment tool of the utility model.

[0016] Figure 2 It is a heat treatment tool of the utility model Figure 1 structure schematic diagram of A-A section.

[0017] Figure 3 It is an overall structure schematic diagram of the heat treatment tool of the utility model placing the steel ball.

[0018] Markings in the figure: 1, base; 2, chamfer; 3, liquid guide groove; 4, liquid-permeable hole; 5, inclined surface; 6, steel ball. DETAILED DESCRIPTION

[0019] The specific implementation of the utility model will be further described in detail in combination with the drawings.

[0020] As Figures 1-3 shown, a heat treatment tool for super large steel ball, including base 1, base 1 is hollow circular ring, along the circumferential direction of base 1 and is evenly provided with liquid-permeable hole 4, and the inner ring surface upper end of base 1 is equipped with chamfer 2, and the inner ring surface chamfer 2 of base 1 is evenly arranged along the circumferential direction and is equipped with liquid guide groove 3, and super large steel ball 6 is placed on the base 1 of heat treatment tool, and the chamfer 2 ring surface of the inner ring surface upper end of base 1 is in annular line contact with steel ball 6.

[0021] The diameter size of the inner ring surface of base 1 matches the cross-sectional diameter size of 1 / 8 to 1 / 7 of steel ball 6, and the outer diameter size of base 1 matches the outer diameter size of steel ball 6; after steel ball 6 is placed on base 1, a gap of 5 to 10 mm is left between the bottom of steel ball 6 and the lower end surface of base 1.

[0022] The chamfer 2 of the inner ring upper end surface of base 1 is a 45° angle with the horizontal direction.

[0023] The liquid-permeable hole 4 is a circular hole penetrating the thickness direction of base 1.

[0024] The liquid guide groove 3 is a bevel structure, the inner side of the liquid guide groove 3 is a bevel 5 which is inclined from top to bottom to the inner ring surface direction of the base 1, the inclination angle of the bevel 5 is an included angle of 45°-60° with the horizontal direction.

[0025] The liquid guide groove 3 and the liquid permeable hole 4 are arranged in the same number and the positions of the liquid guide groove 3 and the liquid permeable hole 4 are staggered.

[0026] The use process of the heat treatment tool for the extra-large steel ball is as follows: according to the size of the steel ball product, a special heat treatment tool of corresponding specification is manufactured, for example, for the steel ball with a diameter of 200mm and 250mm, the steel ball 6 needs to be heat treated in a salt bath roller furnace, the heat treatment tool is placed on a material tray, the steel ball 6 is placed on the base 1 of the heat treatment tool one by one, the steel ball 6 is stably placed on the inner ring surface of the base 1, the point contact of the steel ball 6 with the material tray is changed to the ring line contact of the steel ball 6 with the inner ring surface of the base 1, the contact area of the steel ball 6 is increased, the steel ball 6 is not rolled in the transmission process of the material tray, the unbalanced load of the material tray is avoided, the stable operation of the heat treatment equipment is ensured; in addition, the liquid guide groove 3 and the liquid permeable hole 4 are arranged in the circumferential direction of the base 1, the flow of the quenching liquid during quenching is ensured, the quenching heat treatment of the steel ball 6 is more uniform, and the heat treatment quality of the steel ball 6 product is effectively improved.

[0027] In addition to the above-mentioned embodiments, the utility model can also have other implementation manners, and any technical scheme formed by equivalent replacement or equivalent transformation falls within the protection scope required by the utility model.

Claims

1. A heat treatment tooling for extra-large steel balls, characterized by: The base is a hollow circular ring, and liquid-permeable holes are uniformly arranged along the circumferential direction of the base. The inner ring surface of the base is provided with a chamfer at the upper end, and liquid guide grooves are uniformly arranged along the circumferential direction on the chamfer of the inner ring surface. The extra-large steel ball is placed on the heat treatment tool base, and the chamfer ring surface of the upper end of the inner ring surface of the base is in ring line contact with the steel ball.

2. The heat treatment tooling for extra-large steel balls according to claim 1, characterized in that: The diameter of the inner ring surface of the base matches the diameter of the cross section of the steel ball at 1 / 8-1 / 7, and the outer diameter of the base matches the outer diameter of the steel ball. After the steel ball is placed on the base, a gap of 5-10 mm is left between the bottom of the steel ball and the lower end surface of the base.

3. The heat treatment tooling for extra-large steel balls according to claim 1, characterized in that: The chamfer of the upper end of the inner ring surface of the base is at an angle of 45° with the horizontal direction.

4. The heat treatment tooling for extra-large steel balls according to claim 1, characterized in that: The liquid-permeable hole is a circular hole penetrating the base along the height direction of the base.

5. The heat treatment tooling for extra-large steel balls according to claim 1, characterized in that: The liquid guide groove is a bevel structure, and the inner side surface of the liquid guide groove is a bevel surface inclined from top to bottom to the inner ring surface of the base. The inclination angle of the bevel surface is an angle of 45°-60° with the horizontal direction.

6. The heat treatment tooling for extra-large steel balls according to claim 1, characterized in that: The number of liquid guide grooves is the same as that of liquid-permeable holes, and the positions of the liquid guide grooves and the liquid-permeable holes are staggered.

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