JPS5814853B2 - Manufacturing method of corrosion-resistant and wear-resistant link chain - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for easily manufacturing a link chain with excellent corrosion and wear resistance for use in chain blocks and the like.

In a link chain used in a chain block, etc., a large tension is applied when the shoulders (semicircular parts) of adjacent element links are in contact with each other, and the link chain passes through a load sheave, a guide sheave, etc. At this time, adjacent element links are bent around the contact point of the shoulder under a large tension, so that the part of the element link that wears faster is the inner part of the shoulder.

In addition, if a link chain is subjected to corrosion-resistant and wear-resistant treatment while stretched out due to its own weight, the corrosion-resistant and wear-resistant treatment will be applied with the inner parts of the shoulders of adjacent element links in contact with each other. As a result, the inner portion of the shoulder portion, which most requires corrosion and abrasion treatment, is not treated, resulting in a problem that a link chain with high corrosion and abrasion resistance strength cannot be obtained.

An object of the present invention is to provide a method for manufacturing a link chain that can reliably apply anti-corrosion and wear-resistant treatment even to the inner part of the shoulder of the element link, which is the most necessary part.

Next, this invention will be explained in detail with reference to the drawings.

FIG. 1 shows a state in which a corrosion-resistant and wear-resistant link chain is manufactured by implementing the present invention, and shows the state in which the corrosion-resistant and wear-resistant link chain is manufactured.
Coating agent 2 containing a known organic solvent (e.g. dimethyl glycol ethyl ether, etc.) containing C r O3 (powder):Zn (powder) -1:5 (weight ratio) and other activators.
A pre-quenched link chain or a pre-quenched and tempered link chain 1 is fed from a supply chain wheel 6 which is continuously rotated by a drive device into a coating material 2 in a storage tank 5. The element link 3 at the bottom of the link chain 1 that is being supplied hangingly hits the tank bottom or the element link Q on the tank bottom, and the link chain 1
When the lower part of the element link 3 is relaxed, the shoulder parts of the adjacent element links 3 are released from contact with each other as shown in FIG.
A coating material 2 is applied to the entire surface of the shaft, including the inside of the shoulder, and the link chain to which the coating material is applied is then moved upwardly through a guide chain wheel 7 and driven by a known vibration motor or ultrasonic vibrating device. When the chain passes through the planar cross-shaped chain passage 14 vibrated by the vibration generating device 12 of 36, it receives vibrations from the vibrator 134, so that excessive coating material attached to the element link 3 is The link chain is removed and falls into a storage tank 5, and then the link chain is continuously moved upward in a magnetic or quartz tube 8 in a high frequency induction heating furnace 4 by a high frequency coil 9.
While being induction-heated at 0 to 450°C and tempered or re-tempered, the non-metallic substances in the coating evaporate and the remaining metal is firmly fixed to the entire surface of the element link by baking, and then the baking The tempered link chain is then transferred to a predetermined location via delivery chain wheels 10 and 11 which are rotated by a single drive device at the same speed as the supply chain wheel 6.

Next, embodiment Q of the present invention will be explained.

Example 1 ke) Dimensions and diameter of element link 6. 3 mm, pitch 19.1 mm (2) Element link quality C: 0.23%, Si: 0.12%, Mn: 1, 30%
, P: 0.015%, S: 0.021% (3) First stage heat treatment: Heating to 900°C, water quenching (4) Composition and weight ratio of metal compound (powder) and metal (powder) C r 03 : Zn = 1 2 5 (5) High frequency induction heating humidity and feed speed A. Heating condition: 250°C B. Chain feed speed: 20mrrt/Sec
Example 2 (1) High frequency induction JJ heat humidity and feed rate A. Heating vorticity: 450°C B. Chain feed speed: 50 mm/Sec Example 3 (1) Composition and weight ratio of metal compound (powder) and metal (powder) C r O3'A. I −= 1:8 (2) Other conditions are the same as Example 1 Example 4 K) Composition and weight ratio of metal compound (powder) and metal (powder) Cr 0 3 2 Sn = 1:10 (2 ) Other conditions were the same as Example 1 Example 5 (1)] Oil stage heat treatment After heating to 900°C and water quenching, 200°C
Tempering was performed by heating to 4°C.

(2) Other conditions are the same as Example 1 Example 6 (1) Material of element link (SCM22) C: 0.
20%, Si: 0.25%, Mn: 0.70, P: 0
．． 03% or less, S: 0.03 or more, Cr: 1.05%
, Mo: 0.2% (2) Pre-stage heat treatment: heated to 930°C, gas carburizing, oil quenching (3) Other conditions are the same as Example 1 Example 7 (1) Pre-stage heat treatment: heated to 930°C, gas carburized After oil quenching, 200
' Tempering was performed by heating at C4.

(2) Other conditions are the same as in Example 6 Comparative Example 1 The same element link dimensions, element link material, and pre-stage heat treatment conditions as in Example 1 were adopted, and the coating baking and tempering treatment was omitted.

Comparative Example 2 The same element link dimensions, element link material, and pre-stage heat treatment conditions as in Example 6 were adopted, but the coating baking and tempering treatment was omitted.

The link chains ζ of each of the Examples and Comparative Examples were measured for tensile strength, total elongation at break, corrosion and wear performance, and the results shown in the table below were obtained.

Note 1: Corrosion performance is based on the time taken to rust by the salt spray test method based on JIS, Z23712.Wear performance:
500kg load with 500kg capacity chain block
G is lifted and lowered, and the amount of change in pitch is -0.2.
This is the number of reciprocations until the distance reaches mm.

In addition, Cr 03 and Zn in Example IQ were mixed at 1:5.
~1:15, C r 03 :A l in Example 3
1:5 to 1:10, Cr 03 in Example 40
:S n may be varied within the range of 1:5 to 1215, and when tempering is also performed to bake the coating, the appropriate heating humidity is in the range of 200 to 450°C.

According to this invention, a hardened or hardened and tempered link chain 1 is suspended in a storage tank 5 containing a coating material 2 made of an organic solvent containing an appropriate amount of chromium oxide and one or more of zinc, aluminum, tin, etc. The lower element link 3 of the link chain 1 that is being supplied hanging down is brought into contact with the tank bottom or the element link on the tank bottom, and the element link 3
link chain 1 so that the shoulder parts of the link are released from contact with each other.
, so that by simple means the coating 2 can be reliably deposited on the entire surface of the element link 3Q, including the most necessary inner part of the shoulder, and then the coating is applied to the link 3Q. Since the chain is continuously passed through the furnace core tube 8 in the high frequency induction heating furnace 4 having the furnace core tube 8, tempering is performed which also serves as baking of the coating material.
The link chain, which has excellent corrosion resistance and wear resistance throughout the entire surface of the element link, including the inner part of the shoulder where it is most necessary, can be easily and continuously produced with high efficiency. Manufacturable effects can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal side view showing a state in which a corrosion-resistant and wear-resistant link chain is manufactured by implementing the present invention, and FIG. 2 is a side view showing a state in which the shoulders of element links are released from contact with each other. FIG. 3 is a partially cross-sectional plan view showing the vibrating section. In the figure, 1 is a link chain, 2 is a coating material, 3 is an element link, 4 is a high-frequency induction heating furnace, 5 is a storage tank, 6 is a supply chain wheel, 7 is a guide chain wheel, 10 is a delivery chain wheel, 12 13 is a vibrator.

Claims (1)

[Claims] 1 Quenched or quenched and tempered link chain 1,
The lower element link of the link chain 1 is supplied hanging to a storage tank 5 containing a coating material 2 made of an organic solvent containing appropriate amounts of chromium oxide and one or more of zinc, aluminum, tin, etc. 3 against the tank bottom or the element link C on the tank bottom, and loosen the link chain 1 so that the shoulders of the element links 3 are released from contact with each other, thereby applying the coating material 2 to the element link 3. Then, the link chain with the coating applied thereto is continuously passed through the core tube 8 of a high-frequency induction heating furnace 4 having a core tube 8 to perform tempering, which also serves as baking of the coating. A method for manufacturing a corrosion-resistant and wear-resistant link chain.