Composite PCD cutter

Abstract

The utility model discloses a composite PCD cutter, which relates to the field of PCD cutters and comprises a cutter bar, a plurality of chip grooves arranged on the edge of the end of the cutter bar, an axis groove arranged on the end face of the cutter bar, a plurality of blade components arranged around the inner wall of the axis groove and radially penetrating into the chip grooves. The inner surface of the blade assembly deviates towards the center of the cutter bar from top to bottom to form an inclined face, a supporting block is axially inserted and fixed into the axis groove, and the side face of the supporting block makes parallel contact with the inclined face of the blade assembly, so that the supporting block generates downward and outward extrusion force on the blade assembly. The tool apron is fixed with the tool bar into a whole under the pressure of the inclined surface of the supporting block, so that the blade and the tool bar are in a detachable composite state, the blade and the tool bar can be separated by detaching the supporting block, the blade can be conveniently and independently replaced, and the replacement cost of the tool is reduced.

Description

Technical Field

[0001] The utility model relates to the field of PCD cutting tools, in particular to a composite PCD cutting tool. Background Art

[0002] PCD reamers have multiple carbide blades. The rotating tool uses the annularly distributed blades to fine-tune the inner wall of the hole. The blades will become blunt and damaged after long-term use, while the cutter body still meets the requirements. However, the blades of traditional PCD reamers are directly welded and fixed to the end of the cutter body. If one of the blades is damaged, the entire tool needs to be replaced, which is very expensive to use. Utility Model Content

[0003] The utility model aims to provide a composite PCD tool, which is used to solve the problem that the blade and the cutter body of a traditional reamer are integrally welded and the blade cannot be replaced independently.

[0004] In order to solve the problems existing in the prior art, the technical solution of the present utility model is as follows:

[0005] A composite PCD tool comprises a tool bar, wherein the end edge of the tool bar is provided with a plurality of chip grooves, the end face of the tool bar is provided with an axial groove, and a plurality of blade assemblies are arranged around the inner wall of the axial groove. The blade assemblies radially penetrate into the chip groove, and the inner surface of the blade assembly is offset from top to bottom toward the center of the tool bar to form an inclined surface. A support block is axially inserted and fixed in the axial groove, and the side surface of the support block is in parallel contact with the inclined surface of the blade assembly, so that the support block generates downward and outward extrusion force on the blade assembly.

[0006] Preferably, the blade assembly includes a tool holder, which is placed inside the axial groove. The upper part of the tool holder has a protruding arm. A through groove is opened between the chip groove and the axial groove. The protruding arm extends through the through groove to the chip groove, and the blade is fixed on the surface of the protruding arm.

[0007] Preferably, an embedding groove is provided on the inner wall of the axial groove, the width of the tool holder is greater than the width of the protruding arm, and the tool holder is radially adapted to fit into the embedding groove.

[0008] Preferably, a threaded hole is provided at the bottom of the axial groove, and a screw axially passes through the support block and is threadedly connected to the threaded hole. There is a gap between the bottom end of the support block and the bottom of the axial groove, and a spring is provided between the bottom surface of the support block and the bottom surface of the axial groove.

[0009] Preferably, the top of the support block has an end plate, and the end plate is adapted to the top opening of the axial groove.

[0010] Compared with the related art, the present invention has the following beneficial effects:

[0011] The blade and the knife holder of the utility model are integrated into one body, and the knife holder is fixed to the knife rod by the inclined pressure of the support block, so that the blade and the knife rod are in a detachable composite state. The blade and the knife rod can be separated by removing the support block, so that the blade can be easily replaced independently, thereby reducing the replacement cost of the tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0013] Figure 2 This is a schematic diagram of the tool holder installation structure of the present utility model.

[0014] Figure 3 This is a schematic diagram of the support block structure of the present utility model.

[0015] Figure 4 This is a schematic diagram of the structure of the support block adapted to the extrusion tool holder of the present utility model.

[0016] Figure numerals: 1, tool rod; 2, chip groove; 3, tool holder; 31, protruding arm; 4, embedded groove; 41, through groove; 5, axial groove; 6, support block; 61, end plate. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0018] like Figure 1 、 Figure 2 As shown, the composite PCD tool includes a tool holder 1, a plurality of chip grooves 2 are evenly formed on the end edge of the tool holder 1, an axial groove 5 is formed on the end face of the tool holder 1, and a blade assembly is arranged around the inner wall of the axial groove 5 and aligned with the chip groove 2. The blade assembly includes a tool holder 3, the tool holder 3 is placed inside the axial groove 5, and a protruding arm 31 is provided on the upper part of the tool holder 3. A through groove 41 is formed between the chip groove 2 and the axial groove 5. The protruding arm 31 penetrates into the chip groove 2 from the through groove 41, and one side of the protruding arm 31 is flat against the side of the chip groove 2, and the blade is fixed to the other side of the protruding arm 31.

[0019] like Figure 3 、 Figure 4 As shown, the support block 6 is axially inserted into the axial groove 5, and a threaded hole is opened at the bottom of the axial groove 5. The screw axially penetrates the support block 6 and is threadedly connected to the threaded hole, so that the support block 6 is axially tightened and fixed in the axial groove 5. The inner surface of the tool holder 3 is offset from top to bottom toward the center of the tool rod 1 to form an inclined surface. The side surface of the support block 6 is in parallel contact with the inclined surface of the blade assembly, so that the support block 6 generates a downward and outward extrusion force on the blade assembly.

[0020] The blade, tool holder 3 and protruding arm 31 are regarded as a whole. When assembling the blade, align the tool holder 3 one by one with the chip groove 2 flush against the inner wall of the axial groove 5. The blade extends into the chip groove 2 through the protruding arm 31, and then insert the support block 6 into the axial groove 5. The screw passes through the support block 6 and is connected to the threaded hole. The support block 6 is pushed into the axial groove 5 by rotating the screw. The inclined surface of the support block 6 contacts the tool holder 3, generating a downward and outward extrusion force on the tool holder 3, so that the tool holder 3 is stably fixed. When replacing the blade, the operation is reversed. Loosen the screw to remove the support block 6 from the axial groove 5, and then replace and reassemble the damaged blade.

[0021] like Figure 2 As shown, an embedding groove 4 is opened on the inner wall of the axial groove 5, the width of the tool holder 3 is greater than the width of the protruding arm 31, and the tool holder 3 is radially adapted to be snapped into the embedding groove 4, so that the tool holder 3 is precisely limited and fixed in the axial groove 5, thereby improving the installation stability of the blade.

[0022] like Figure 4 As shown, there is a gap between the bottom end of the support block 6 and the bottom of the axial groove 5, so that the support block 6 has space to continuously move inward, maintaining sufficient squeezing operation space for the support block 6 to the tool holder 3, and a spring is provided between the bottom surface of the support block 6 and the bottom surface of the axial groove 5. When replacing the blade, after loosening the screw, the support block 6 is directly pushed outward by the spring, making it convenient to remove the support block 6 from the axial groove 5.

[0023] The top of the support block 6 is provided with an end plate 61 , which fits into the top opening of the axial groove 5 , so that the end of the tool rod 1 forms a complete surface to avoid accumulation of chips.

[0024] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A composite PCD tool, characterized in that: The utility model comprises a tool rod (1), wherein a plurality of chip grooves (2) are provided on the end edge of the tool rod (1), an axial groove (5) is provided on the end face of the tool rod (1), and a plurality of blade assemblies are arranged around the inner wall of the axial groove (5), the blade assemblies radially penetrate into the chip groove (2), and the inner surface of the blade assembly is offset from top to bottom toward the center of the tool rod (1) to form an inclined surface, and a support block (6) is axially inserted and fixed in the axial groove (5), and the side surface of the support block (6) is in parallel contact with the inclined surface of the blade assembly, so that the support block (6) generates a downward and outward squeezing force on the blade assembly.

2. The composite PCD tool according to claim 1, characterized in that: The blade assembly includes a blade seat (3), the blade seat (3) is placed inside the axial groove (5), the upper part of the blade seat (3) has a protruding arm (31), a through groove (41) is provided between the chip groove (2) and the axial groove (5), the protruding arm (31) passes through the through groove (41) and extends to the chip groove (2), and the blade is fixed on the surface of the protruding arm (31).

3. The composite PCD tool according to claim 2, characterized in that: An embedding groove (4) is provided on the inner wall of the axial groove (5); the width of the knife seat (3) is greater than the width of the protruding arm (31); and the knife seat (3) is radially adapted to fit into the embedding groove (4).

4. The composite PCD tool according to claim 1, characterized in that: A threaded hole is provided at the bottom of the axial groove (5), and a screw axially penetrates the support block (6) and is threadedly connected to the threaded hole.

5. The composite PCD tool according to claim 4, characterized in that: There is a gap between the bottom end of the support block (6) and the bottom of the axial groove (5).

6. The composite PCD tool according to claim 5, characterized in that: A spring is provided between the bottom surface of the support block (6) and the bottom surface of the axial groove (5).

7. The composite PCD tool according to claim 1, characterized in that: The top of the support block (6) is provided with an end plate (61), and the end plate (61) is adapted to the top opening of the axial groove (5).

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