Novel rivet-inlaid hard alloy saw blade

Abstract

The novel rivet-inlaid hard alloy saw blade comprises a base body and a tool bit welded to the top end of the outer circle of the base body, an expansion joint is formed in the base body, and a copper rivet is inlaid in a round hole in the bottom of the expansion joint; the round hole in the bottom of the expansion joint is a threaded hole, and the copper rivet is of a screw structure. After the copper rivet is screwed into the threaded hole, the two end faces of the copper rivet are riveted to the base body and ground to be flat; counter bores are formed in two ends of the threaded hole; after the copper rivet is screwed into the threaded hole, the two end faces of the copper rivet are riveted into the counter bores of the base body; the bottom surface of the counter bore is provided with a slotted hole for enhancing the connection strength of the copper rivet; the cutting tool has the beneficial effects that through the arrangement of the threaded hole and the threaded copper rivet, the connection strength of a base body of the copper rivet can be improved, looseness is avoided, and the purpose of reducing cutting noise is achieved.

Description

Technical Field

[0001] The present application relates to the field of carbide saw blade manufacturing, and in particular to a novel carbide saw blade with rivets. Background Art

[0002] The carbide saw blade consists of a circular base located in the center of the saw blade and a carbide cutter head brazed to the outside of the base and evenly distributed on the tooth seat. The base is located inside the saw blade, supporting and fixing the cutter head and transmitting motion and power to the cutter head; the cutter head is the working part of the entire saw blade, evenly distributed on the outer edge of the base, and plays a cutting role on the cutting object. Generally, an expansion joint is set on the outside of the base, also known as an expansion groove, to prevent the saw blade from becoming unstable and deforming due to the temperature rise of the saw blade during the cutting process. The most common structure of the expansion joint is the keyhole-shaped expansion joint, such as Figure 2 The bottom of the keyhole is a circular hole structure to eliminate stress concentration and ensure the strength of the base. In high-end carbide saw blades for wood, a copper cylinder, commonly known as a copper rivet or copper nail, is embedded in the bottom circular hole of the keyhole to absorb saw blade vibration and reduce noise.

[0003] Existing copper rivets are made by inserting cylindrical rivets into the bottom hole of the keyhole (such as Figure 8 As shown), and then riveted, the connection strength is relatively low; although the copper nail structure plays a certain role in reducing vibration and noise, during the storage, transportation and use of the saw blade, due to the creep effect of the metal, a certain degree of looseness will occur between the copper nail and the base. If a gap appears between the two, it will increase vibration and noise, or even fall out and cause safety hazards. This situation occurs from time to time, which hinders the promotion of the copper nail structure;

[0004] The existing patent application number is 201020163090.3, and the name is carbide circular saw blade. It discloses that it includes a cutter head and a base. The cutter head is composed of a carbide block and a brazing material. The carbide blocks are irregular in shape and irregularly arranged with each other. The tooth tops are sharp and the blades are uniform. The base is brazed with the cutter head after machining. The base is provided with "C"-shaped laser cut slits, which are evenly distributed in the circumference. The base between each two adjacent groups of cutter heads is provided with an expansion joint (3) inlaid with copper rivets. The copper rivet inlay structure is not disclosed in detail, and needs to be improved. Utility Model Content

[0005] The purpose of this application is to provide a new type of rivet-embedded carbide saw blade, which improves the copper rivet inlay structure and makes the copper rivets firmly inlaid and not loose.

[0006] To achieve the above objectives, this application adopts the following technical solutions:

[0007] A new type of rivet-embedded carbide saw blade includes a base and a cutter head welded to the outer circular top end of the base. An expansion joint is provided on the base, and a copper rivet is embedded in the circular hole at the bottom of the expansion joint; the circular hole at the bottom of the expansion joint is a threaded hole, and the copper rivet is a screw structure; after the copper rivet is screwed into the threaded hole, the two end faces of the copper rivet are riveted to the base and then ground flat.

[0008] Furthermore, countersunk holes are provided at both ends of the threaded hole; after the copper rivet is screwed into the threaded hole, the two end faces of the copper rivet are riveted into the countersunk holes of the base.

[0009] Furthermore, the diameter of the threaded hole is d, the diameter of the countersunk hole is d+2δ, and δ is 1-2 mm; the depth of the countersunk hole is h, and h is 0.2-0.3 mm.

[0010] Furthermore, a slot hole for enhancing the connection strength of the copper rivet is provided on the bottom surface of the countersunk hole.

[0011] Furthermore, the cross section of the slot is a dovetail slot.

[0012] Furthermore, the cross section of the slot is a T-shaped slot.

[0013] The beneficial effects of this application are:

[0014] The threaded holes and threaded copper rivets can improve the connection strength of the copper rivet base, prevent loosening, and reduce cutting noise.

[0015] Since the thread structure increases the bonding area between the copper nail and the base, the friction between the two is increased, and the bonding between the two is more firm and reliable.

[0016] The thread structure effectively prevents the copper nail from moving axially and falling out. The requirements for the pitch fully guarantee the function of the thread structure;

[0017] The protrusion of the cylindrical surface of the copper nail on the straight side of the expansion joint prevents the copper nail from rotating, thereby preventing the copper nail from falling out. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of this application;

[0019] Figure 2 for Figure 1 Magnified view of point I;

[0020] Figure 3 for Figure 1 EE section view;

[0021] Figure 4 A schematic diagram of a partial three-dimensional structure of this application;

[0022] Figure 5 This is a schematic diagram of the three-dimensional structure of the copper rivet and expansion joint connection of this application;

[0023] Figure 6 is a cross-sectional view of the copper rivet and the substrate of Example 2;

[0024] Figure 7 is a cross-sectional view of the copper rivet and the substrate of Example 3;

[0025] Figure 8 This is a schematic three-dimensional diagram of the connection between the copper rivet and the base before improvement;

[0026] The numbers in the figure are

[0027] 1-base, 2-copper rivet, 3-cutting head;

[0028] 11-threaded hole, 12-countersunk hole, 13-slotted hole, 14-expansion joint, 15-chip groove. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. The described embodiments are only part of the embodiments of the present application, not all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present application without creative work shall fall within the scope of protection of this application.

[0030] Example 1

[0031] like Figure 8 As shown,

[0032] The copper rivet 2 is now cylindrical when connected to the bottom hole of the expansion joint 14 on the base 1. The base 1 is provided with a chip groove 15, and the cutter head 3 is welded to the tooth seat of the chip groove 15. The number of expansion joints 14 is determined by the diameter of the saw blade and the number of cutter heads 3. Generally, one expansion joint 14 is provided every 23-25 cutter heads 3. The expansion joint 14 is in the shape of a keyhole.

[0033] like Figure 1-7 As shown, an improved new type of rivet-studded carbide saw blade, the circular hole at the bottom of the expansion joint 14 is a threaded hole 11, and the copper rivet 2 is a screw structure (the copper rivet 2 is provided with an external thread);

[0034] After the copper rivet 2 is screwed into the threaded hole 11, both ends of the copper rivet 2 protrude from the plane of the base 1, generally by about 0.5mm. The two end faces of the copper rivet 2 are then riveted to the base 1, and the portion of the copper rivet 2 protruding from the base 1 is ground flat. After riveting, the copper rivet 2 deforms and enters the expansion joint 14. The length of the portion entering the expansion joint 14 is δ, and δ is 0.2-0.3mm. If it is not ground flat, the copper rivet 2 will contact the object being cut first during cutting, causing the copper rivet 2 to fall off prematurely.

[0035] In order to increase the connection strength, the copper screw 2 and the threaded hole 11 on the base 1 can both adopt fine pitch threads;

[0036] In order to verify the connection strength of the copper rivet 2 after it was improved from a cylindrical shape to a screw shape (that is, with an external thread), we conducted a cutting test. With a 250 diameter saw blade of the same diameter and number of teeth, the cylindrical copper rivet cut through about 200 meters of wood (10 cm thick) and the copper rivet 2 flew out. However, when the copper rivet on the copper rivet saw blade with an external thread cut through 600 meters of wood, there was no loosening at the rivet connection, which is a significant effect.

[0037] Example 2

[0038] The structure of this embodiment is basically the same as that of embodiment 1.

[0039] The difference is that

[0040] like Figure 6-7 As shown,

[0041] Both ends of the threaded hole 11 are provided with countersunk holes 12; after the copper rivet 2 is screwed into the threaded hole 11, the two end faces of the copper rivet 2 are riveted into the countersunk holes 12 of the substrate 1 and smoothed to prevent the copper rivet 2 from protruding from the surface of the substrate 1.

[0042] The major diameter of the threaded hole 11 is d, the diameter of the countersunk hole 12 is d+2δ, where δ is 1-2 mm; the depth of the countersunk hole 12 is h, where h is 0.2-0.3 mm. This dimension is obtained based on experience;

[0043] After the copper rivet 2 is riveted, the cross section formed with the base 1 is an I-shaped structure, which increases the connection strength.

[0044] In order to increase the connection strength of the rivet, a slot 13 is provided on the bottom surface of the countersunk hole 12 for strengthening the connection strength of the copper rivet 2.

[0045] The cross section of the slot 13 is a dovetail slot.

[0046] The dovetail groove 13 is difficult to process and is not yet mature.

[0047] Example 3

[0048] The structure of this embodiment is basically the same as that of embodiment 1.

[0049] The difference is that

[0050] like Figure 6-7 As shown, the cross section of the slot 13 is a T-shaped slot.

[0051] T-slots are also difficult to process. Currently, they are not used on a large scale and only samples have been made. However, after destructive tests, it was found that saw blades with T-slots or dovetail slots cause much more damage to the rivet connection of the saw blade base than saw blades without slots.

[0052] The above is only a preferred specific implementation method of the present application; however, the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed in the present application according to the technical solution and its improved conception of the present application, which should be covered by the protection scope of the present application.

[0053] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

Claims

1. A novel rivet-embedded carbide saw blade, comprising a base (1) and a cutter head (3) welded to the outer circular top of the base (1), an expansion joint (14) being provided on the base (1), and a copper rivet (2) being embedded in a circular hole at the bottom of the expansion joint (14); characterized in that: The circular hole at the bottom of the expansion joint (14) is a threaded hole (11), and the copper rivet (2) is a screw structure; after the copper rivet (2) is screwed into the threaded hole (11), the two end faces of the copper rivet (2) are riveted to the base (1) and then ground flat.

2. The novel rivet-embedded carbide saw blade according to claim 1, characterized in that: Countersunk holes (12) are provided at both ends of the threaded hole (11); after the copper rivet (2) is screwed into the threaded hole (11), the two end faces of the copper rivet (2) are riveted into the countersunk holes (12) of the base (1).

3. The novel rivet-embedded carbide saw blade according to claim 2, characterized in that: The major diameter of the threaded hole (11) is d, the diameter of the countersunk hole (12) is d+2δ, and the δ is 1-2 mm; the depth of the countersunk hole (12) is h, and the h is 0.2-0.3 mm.

4. The novel rivet-embedded carbide saw blade according to claim 2, characterized in that: A slotted hole (13) for enhancing the connection strength of the copper rivet (2) is provided on the bottom surface of the countersunk hole (12).

5. The novel rivet-embedded carbide saw blade according to claim 4, characterized in that: The cross section of the slot hole (13) is a dovetail slot.

6. The novel rivet-embedded carbide saw blade according to claim 4, characterized in that: The cross section of the slot (13) is T-shaped.

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