Method of hard coating a surface with carbide
View Patent ↗A method of hard coating a surface with carbide. A first step involves positioning a temporary membrane a pre-selected distance from a surface of a work piece to be hard coated to create a insertion gap which is accessible from an upper end. A second step involves filling the insertion gap with carbide pieces, sized to fit the insertion gap in a selected orientation, by inserting the carbide pieces from the upper end of the insertion gap and allowing them to drop into the insertion gap by force of gravity. A third step involves filling spaces between the carbide pieces with bonding powder by inserting the bonding powder into the upper end of the insertion gap. A fourth step involves heating the powder until the carbide pieces are bonded to the surface. A fifth step involves removing the temporary membrane.
1. A method of hard coating a surface with carbide, comprising the steps of:
providing identical circular carbide pucks having a diameter and a height, the diameter being greater than the height;
positioning a temporary membrane a pre-selected distance from a surface of a work piece to be hard coated to create an insertion gap that is smaller than the diameter of the carbide pucks and just large enough to receive the carbide pucks placed on edge;
filling the insertion gap with the carbide pucks placed on edge;
filling spaces between the carbide pucks with a bonding agent by inserting the bonding agent into an upper end of the insertion gap;
heating the bonding agent until the carbide pucks are bonded to the surface; and
removing the temporary membrane.
2. The method as defined in claim 1 , the bonding agent being a powder.
3. The method as defined in claim 1 , the work piece being tubular and the temporary membrane being a sleeve.
4. The method as defined in claim 1 , including a step of filling the insertion gap with carbide pucks by inserting them from the upper end into the insertion gap and allowing them to drop by force of gravity.
5. The method as defined in claim 4 , including a step of shaking the work piece concurrently with the step of filling the insertion gap with carbide pucks, thereby promoting a uniform distribution of the carbide pucks.
6. The method as defined in claim 1 , including a step of subjecting the work piece to centrifugal force prior to and then concurrently with the step of filling the insertion gap with the bonding agent.
7. A method of hard coating a surface with carbide, comprising the steps of:
providing identical carbide pucks having a multisided peripheral edge, a diameter and a height that is less than the diameter;
securing a temporary membrane in the form of a tubular sleeve a pre-selected distance from a surface of a tubular work piece to be hard coated to create an insertion gap which is accessible from an upper end that is smaller than the diameter of the carbide pucks and just large enough to receive the carbide pucks on edge;
filling the insertion gap by inserting the carbide pucks on edge from the upper end of the insertion gap and allowing them to drop into the insertion gap by force of gravity;
shaking the work piece thereby promoting a uniform distribution of the carbide pucks, which orient themselves due to the relative engagement of their multisided peripheral edges;
filling spaces between the carbide pucks with bonding powder by inserting the bonding powder into the upper end of the insertion gap;
heating the powder until the carbide pucks are bonded to the surface; and
removing the temporary membrane.
8. The method as defined in claim 1 , including a step of subjecting the work piece to centrifugal force prior to and then concurrently with the step of filling the insertion gap with bonding powder, to laterally align the carbide pucks in a consistent manner.
9. The method as defined in claim 1 , including a step of heat treating prior to removing the temporary membrane.
10. The method of claim 1 , further comprising the step of securing carbide pieces together into preformed groupings of carbide pieces prior to filling the insertion gap with carbide pieces.
11. The method as defined in claim 10 , wherein the groupings of carbide pieces are rings.
12. A method of hard coating a surface with carbide, comprising the steps of:
providing identical carbide pucks having a peripheral edge, opposed faces, spacing nubs projecting from the opposed faces, a diameter and a height that is less than the diameter;
positioning a temporary membrane a pre-selected distance from a surface of a work piece to be hard coated to create a insertion gap that is smaller than the diameter to receive the carbide pucks positioned on edge;
filling the insertion gap with the carbide pucks placed on edge and having their spacing nubs engaging the surface of the work piece and the temporary membrane;
filling spaces between the carbide pucks with a bonding agent by inserting the bonding agent into an upper end of the insertion gap;
heating the bonding agent until the carbide pucks are bonded to the surface; and
removing the temporary membrane.