Principles and Standards for Dealing with Quality Problems of DTH Drill Bits

In order to facilitate customers to understand our company's guarantee commitments and handling standards for drill bit product quality issues, and to enhance communication and contact with each other, the following principles and standards are specially formulated for customers' reference:

1. When the service life of the drill bit body is less than 1/2, there will be a broken body; when the original exposed part of the alloy is worn less than 1/7, there will be tooth loss and broken tooth, 100% compensation for these two cases.

2. When the service life of the drill bit is less than 1/4, the phenomenon that more than 2 grains of the whole alloy tooth column completely fall off from the tooth hole can be exchanged.

3. Due to the complex causes of alloy fracture and crushing (such as human factors and reinforced concrete, etc.), in principle, no compensation will be made for the simple bit broken teeth.

4. In the case of severe wear of the bit body and alloy, there is generally no compensation for broken bodies, missing pieces, broken teeth, and missing teeth.

5. If the drill bit is used in weathered rock, limestone, or other unnamed soft rocks, even if there are broken bodies, collapsed blocks, tooth loss, or broken teeth, it should be based on the spline wear of the drill bit and the impact degree of the tail impact end. Make reasonable compensation.

6. When using our drill bit products in batches, at the beginning of abnormal situations (the same kind of abnormal damage occurs when using 1 or 2 drill bits), please contact our company or the supplier in time, and suspend the use of the remaining products, our company will Provide services in a timely manner and make processing (such as replacement). If you do not contact our company or supplier, continue to use, our company will not compensate.

7. Processing procedure: If the user uses our company's drill bit in the above situation, first of all, the damaged drill bit should be delivered to the production technology department of our company in time (the tail part of the drill bit must be retained), and our company will reply within one week according to the quality service commitment and processing standards.

8. If there are other disputes, the drill bits must be sent back to our company, and then handled through friendly negotiation between the two parties.

If there is any objection to the above principles and standards, our company is responsible for giving an explanation.

1. 100% claim

1. The bit body breaks when the service life of the bit body is less than 50%;

2. In the case of hard rock, when the tooth wear width H is less than or equal to 30% of the diameter of the tooth, there will be 2 or more non-adjacent side teeth falling off, broken teeth, or partial chipping and drilling of the bit body. Any failure mode such as tail drop, neck break, and handle break.

2. Proportional claims

Under normal operating conditions, the outer diameter of the drill bit body, the striking surface, the spline, and the alloy of the side teeth are moderately worn, and there are more than 2 pieces of broken shank, partial chipping, shank loss, broken teeth or missing teeth. According to the actual amount of wear and tear, the proportion of the missing part that reaches the life specified in this principle is proportional to the claim.

1. When the wear width H of the side tooth alloy is greater than 30% and less than 60% of the diameter of the side tooth;

2. When the striking surface depth B is greater than 50% of the specified life and less than the specified life;

3. When the spline wear width is greater than 50% of the specified life and less than the specified life;

4. When the outer diameter of the drill bit body wears more than 50% of the specified life and is less than the specified life;

5. When the above four conditions exist at the same time, it is calculated according to the failure form closest to the life span.

3. No claims

Complying with any of the following items, there will be no claim for any failure.

1. Drill holes in abnormal formations such as pebble layer, fracture layer, reinforced cement layer, etc.;

2. When the alloy of the drill bit has been worn to reach or exceed the life specified in this principle, the failure modes such as broken body, falling block, broken tooth and tooth loss appear;

3. When the bit body is worn or the hitting depth of the bit tail hitting surface reaches or exceeds the life period specified in this principle, the failure modes such as broken body, falling block, broken tooth and tooth loss appear;

4. When the wear of the bit body spline reaches or exceeds the life period specified in this principle, any failure mode occurs;

5. When the diameter of the head of the drill body is worn or the amount of top abrasion reaches or exceeds the life period specified in this principle.

6. Used for tooth loss and broken tooth of alloy column caused by reaming drilling.

7. When the user remakes any part of the drill by himself (including sharpened ones).

Description:

1. Limestone: Because there are rock-soil interlayers and many fissures in the limestone. The hardness is not high and does not contain quartz sand. When the drill bit is used for a long time, although the alloy and steel body of the drill bit are slightly worn, when there are more cracks, the drill bit will collapse due to fatigue, broken teeth and broken ends. , This phenomenon is a normal scrap.

2. Weathered rock and coal mines: these two kinds of rocks hardly wear alloys and slightly wear steel bodies. When the drill bit has too many meters drilled, it will cause block, broken teeth, and broken bodies due to fatigue. This phenomenon belongs to Normally scrapped.

3. Iron ore with very hard and high resistance: The rock is very hard and has too much resistance, causing the drill bit to be caught in the middle and unable to drill. At this time, the drilling parameters should be adjusted in time, otherwise it will cause the bit to fall off. Phenomena such as broken teeth and broken bodies. This phenomenon belongs to abnormal scrapping caused by improper operation.

Four. Anomalies

1. When using drills in batches, at the beginning of abnormal situations (abnormal damage occurs when using 2~3 drills), please contact the supplier in time and suspend the use of the remaining products. The manufacturer provides services in a timely manner to deal with it (exchange or contact the manufacturer). If you continue to use it, the manufacturer will not make a claim.

2. Under normal operation, when the service life of the drill bit is less than 25% of the normal service life, more than 2 pieces of the entire alloy column tooth may fall off the tooth hole (column drop), return to the manufacturer for repair.

V. Processing procedures

1. If the above situation occurs when the user uses the drill, the physical object and the drill body or tail of the failed drill should be retained and returned to the manufacturer in time. The manufacturer should reply in time according to the above principles after receiving the goods.

2. If there is any other dispute, both parties will deal with it after negotiation.