Bar sintering appliance for five-axis machining milling cutter

Abstract

The utility model relates to the technical field of sintering appliances, in particular to a bar sintering appliance for a five-axis machining milling cutter, which comprises a boat, a plurality of exhaust slots are arranged in the boat, a plurality of support slots with X-shaped cross sections are arranged above the exhaust slots, and hollow slots communicated with the exhaust slots are arranged in the middle of the support slots. According to the scheme, through the design of the exhaust grooves, the supporting grooves and the hollowed-out grooves, under the condition of the same gas flow, more paraffin steam can be exhausted, the carbon atmosphere and temperature field uniformity of the upper portion and the lower portion of a bar can be better balanced, the contact area of the bar and the boat is reduced, the radial shrinkage resistance of the bar in the compact stage is reduced, and the yield of the bar is improved. Therefore, the quality of the bar and the uniformity of crystal grains are improved, and the problems of poor carbon atmosphere uniformity and poor temperature field uniformity of the lower part of an existing vessel sintering bar are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of sintering apparatuses, in particular to an apparatus for sintering rods for five-axis machining milling cutters. Background Art

[0002] Sintered carbide rods are the core raw material for tools such as milling cutters and drill bits, and play a decisive role in the service life and processing quality of the tools. According to the production characteristics of sintered carbide rods, in order to facilitate extrusion or compression molding, molding agents such as paraffin are usually added. During sintering, a dewaxing process with a low heating rate and long holding time is usually adopted. However, the paraffin is still not completely removed. In particular, in the area in contact with the boat, the residual paraffin will crack at the high temperature stage, resulting in a local increase in carbon atmosphere, causing deformation and even local carburization.

[0003] The existing equipment used for cemented carbide rods is a graphite boat: a number of V-shaped grooves are opened on the surface of a graphite plate, and paint is brushed or sprayed on the surface of the graphite plate and in the V-shaped grooves to prevent the rod from sticking and carburizing. The rod blank is then placed in the V-shaped groove for sintering. Although this method improves the atmosphere at the bottom of the rod, due to the small space at the bottom of the V-shaped groove, the lower part of the rod still has problems such as poor carbon atmosphere uniformity and poor temperature field uniformity. This can easily cause uneven grains, large differences in grain size, and large differences in cobalt phase content between the lower and upper parts of the rod, thereby shortening the service life of milling cutters and drill bits. Utility Model Content

[0004] The utility model aims to provide a five-axis machining milling cutter bar sintering apparatus to solve the problems of poor carbon atmosphere uniformity and poor temperature field uniformity in the lower part of the existing vessel sintering bar.

[0005] In order to achieve the above-mentioned purpose, the basic scheme of the utility model is as follows: a five-axis machining milling cutter rod sintering device, including a boat, a plurality of exhaust grooves are provided inside the boat, a plurality of support grooves with X-shaped cross-sections are provided above the exhaust grooves, and a hollow groove connected to the exhaust groove is provided in the middle of the support groove.

[0006] The beneficial effects of this solution are as follows: (1) Through the design of exhaust grooves, support grooves and hollow grooves, this solution can discharge more paraffin vapor under the same gas flow rate, and can better balance the carbon atmosphere and temperature field uniformity between the upper and lower parts of the rod.

[0007] (2) The contact area between the rod and the boat is reduced, which reduces the resistance of the rod to radial contraction during the densification stage, thereby improving the quality of the rod and the uniformity of the grains.

[0008] (3) When brushing or spraying the anti-stick coating on the boat, only the upper surface of the support groove can be brushed or sprayed to reduce the influence of factors such as coating composition, unreasonable spraying process and substandard spraying quality on the rod material.

[0009] Furthermore, the upper angle of the support groove is 120°, which is suitable for sintering rods of different diameters.

[0010] Furthermore, the edges of the support grooves are formed in arc transition, which makes it easy to obtain rods with good surface quality.

[0011] Furthermore, the exhaust grooves are cross-shaped exhaust grooves with a lateral spacing of 5 to 10 mm. The cross-shaped exhaust grooves are more conducive to the discharge of paraffin vapor and better balance the carbon atmosphere and temperature field uniformity between the upper and lower parts of the rod.

[0012] Furthermore, the invention further comprises a plurality of support columns, the upper and lower edges of the boat are both horizontal, a plurality of the boats are provided, and the plurality of boats are stacked up and down through the support columns, so as to facilitate the stacking of the boats. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the utility model;

[0014] Figure 2 A top view of an embodiment of the present utility model;

[0015] Figure 3 The figure shows the specific structure of the support groove in the embodiment of the present utility model. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0017] The reference numerals in the drawings of the specification include: a boat 1 , a support column 2 , an exhaust groove 3 , a support groove 4 , a hollow groove 5 , and a rod 6 .

[0018] Example

[0019] Basically as attached Figure 1 、 Figure 2 As shown: A five-axis milling cutter bar sintering apparatus, comprising a plurality of boats 1 and a plurality of support columns 2, the boats 1 and the support columns 2 are made of graphite material, the boat 1 is provided with a plurality of exhaust grooves 3 inside, the exhaust grooves 3 are cross-shaped exhaust grooves 3, the horizontal spacing of the exhaust grooves 3 is 5 to 10 mm, combined with Figure 3 As shown, several support grooves 4 with X-shaped cross sections are provided above the exhaust grooves 3. The upper angle of the support grooves 4 is 120°. A hollow groove 5 connected to the exhaust grooves 3 is provided in the middle of the support grooves 4. The edges of the support grooves 4 adopt arc transition.

[0020] The upper and lower edges of the boat 1 are both horizontal, and multiple boats 1 are stacked up and down through the support columns 2 .

[0021] The specific implementation process is as follows: by increasing the wax discharge space at the bottom of the rod 6 and combining the cross-structured exhaust groove 3, the carbon atmosphere and temperature field at the upper and lower parts of the rod 6 are balanced, and the cobalt phase migration caused by the local carbon potential difference during the sintering process of the rod 6 is reduced, thereby reducing the bending deformation and grain unevenness of the rod 6; compared with the conventional V-groove boat, the graphite boat 1 for sintering the rod 6 provided by the present invention ensures the uniformity of the atmosphere and temperature field at the upper and lower parts during the sintering of the rod, improves the uniformity of the cobalt phase and grain size of the rod 6, improves the quality of the rod, and lays the foundation for the production of high-end rod milling tools.

[0022] 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.

[0023] The above is only an embodiment of the present utility model. Common knowledge such as the known specific structures and characteristics in the scheme is not described in detail here. Ordinary technicians in the relevant field are aware of all common technical knowledge in the technical field of the utility model before the application date or priority date, can obtain all existing technologies in the field, and have the ability to apply conventional experimental means before that date. Ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the inspiration given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for technicians in this field, without departing from the structure of the utility model, several deformations and improvements can be made, which should also be regarded as the scope of protection of the utility model. These will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A bar sintering apparatus for five-axis milling cutter, characterized in that: The boat comprises a boat, wherein a plurality of exhaust grooves are arranged inside the boat, a plurality of support grooves with X-shaped cross sections are arranged above the exhaust grooves, and a hollow groove communicating with the exhaust grooves is arranged in the middle of the support grooves.

2. The rod sintering device for five-axis milling cutter according to claim 1, characterized in that: The upper angle of the support groove is 120°.

3. The rod sintering apparatus for five-axis milling cutter according to claim 2, characterized in that: The edge of the support groove adopts arc transition.

4. The rod sintering apparatus for five-axis milling cutter according to claim 3, characterized in that: The exhaust grooves are cross-shaped exhaust grooves, and the lateral spacing of the exhaust grooves is 5 to 10 mm.

5. The rod sintering device for five-axis milling cutter according to claim 4, characterized in that: It also includes a plurality of support columns. The upper and lower edges of the boat are both horizontal. A plurality of boats are provided, and the plurality of boats are stacked up and down through the support columns.

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